Merge pull request 'Add PHPUnit test suite — 222 tests, 100% code coverage' (#1) from Lyra into main

First AI contribution to main branch, a full suite of tests, thank you GLM-5.2.

.editorconfig

@@ -1,3 +1,20 @@
+# editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
 [Caddyfile]
 indent_style = tab
 
+[{compose.yaml,compose.*.yaml}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false

.env.example

@@ -1,37 +0,0 @@
-# required, if missing will generate random values
-# encryption key used to store sessions (static random bytes) in base64
-PREAUTH_KEY=''
-# TOTP (RFC 6238) secret/token (static random bytes) in base32
-PREAUTH_TOKEN=''
-
-# optional, change time-to-live, subdomain, default-redirect, text or colors
-# how long a session lasts (in minutes): 43200 is 30 days
-PREAUTH_TTL=43200
-PREAUTH_SUBDOMAIN='preauth'
-PREAUTH_SEND_TO='https://secure.example.com/'
-PREAUTH_BACKGROUND='#029386'
-PREAUTH_FOREGROUND='#ffffff'
-PREAUTH_TITLE='Pre-Authentication System'
-PREAUTH_ID_NAME='Session ID'
-PREAUTH_TOKEN_NAME='Authentication Token'
-PREAUTH_SUBMIT_NAME='Submit'
-# how many consecutive failed login attempts before we block them (a remote-ip)
-PREAUTH_RATE_LIMIT=4
-# maximum time between failed login attempts to still be consecutive (in minutes): 360 is 6 hours
-PREAUTH_RATE_TIMEOUT=360
-# how long after last failed login will they be blocked (in minutes): 1440 is 24 hours
-PREAUTH_RATE_BLOCKED=1440
-# what do we show when they get rate-limited
-PREAUTH_DENIED_CODE=418
-PREAUTH_DENIED_TITLE="I'm a teapot"
-PREAUTH_DENIED_MESSAGE='I refuse to brew coffee.'
-# alternatively, you could use a more standard response
-#PREAUTH_DENIED_CODE=429
-#PREAUTH_DENIED_TITLE='Too Many Requests'
-#PREAUTH_DENIED_MESSAGE='Try again later.'
-
-# who owns the session files
-# permissions of the volume must match
-USER_ID=1000
-GROUP_ID=1000
-

.env.test

@@ -0,0 +1,27 @@
+APP_ENV=test
+APP_DEBUG=0
+APP_SECRET=test_secret_key_change_me
+# fixed TOTP secret (JBSWY3DPEHPK3PXP) so functional tests can compute valid codes
+TOTP_URI='otpauth://totp/Test-TOTP?secret=JBSWY3DPEHPK3PXP'
+COOKIE_TTL=2592000
+SUBDOMAIN_REDIRECT=0
+AUTH_SUBDOMAIN=''
+IP_TTL=0
+TEAPOT=1
+BURST_COUNT=10
+BURST_TIME=30
+UPPER_COUNT=100
+UPPER_TIME=3600
+TITLE='Pre-Authentication System'
+BG_COLOR='#029386'
+FG_COLOR='#ffffff'
+ERROR_COLOR='#ffb16d'
+ID_NAME='Session ID'
+TOKEN_NAME='Authentication Token'
+SUBMIT_NAME='Submit'
+ERROR_MESSAGE='Unsuccessful login attempt'
+TEAPOT_TITLE="I'm a teapot"
+TEAPOT_MESSAGE='I refuse to brew coffee'
+TOO_MANY_TITLE='Too many requests'
+TOO_MANY_MESSAGE='Try again later'
+SHELL_VERBOSITY=0

.gitea/workflows/develop.yaml

@@ -0,0 +1,34 @@
+name: Push Develop
+
+on:
+  push:
+    branches:
+      - 'main'
+      - 'develop'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ${{ vars.DOCKERHUB_TARGET }}:develop
+

.gitea/workflows/docker.yaml

@@ -0,0 +1,34 @@
+name: Push Docker
+
+on:
+  push:
+    tags:
+      - '*.*.*'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ${{ vars.DOCKERHUB_TARGET }}:latest
+            ${{ vars.DOCKERHUB_TARGET }}:${{ github.ref_name }}
+

.gitea/workflows/publish.yaml

@@ -0,0 +1,37 @@
+name: Sync GitHub
+
+on:
+  push:
+    branches:
+      - '**'
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config --global user.name "Andrew Sync"
+          git config --global user.email "sync@digitaladapt.com"
+
+      - name: Add GitHub Remote
+        env:
+          SYNC_TOKEN: ${{ secrets.SYNC_GITHUB_TOKEN }}
+          SYNC_TARGET: ${{ vars.SYNC_GITHUB_TARGET }}
+        run: |
+          git remote add github "https://digitaladapt:${SYNC_TOKEN}@github.com/$SYNC_TARGET"
+
+      - name: Push Current Branch
+        run: |
+          git push github HEAD:${GITHUB_REF_NAME}
+
+      - name: Push Tags
+        run: |
+          git push github --tags
+

.gitea/workflows/tests.yaml

@@ -0,0 +1,33 @@
+name: Tests
+
+on:
+  push:
+    branches:
+      - 'main'
+      - 'develop'
+  pull_request:
+    branches:
+      - 'main'
+      - 'develop'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.5'
+          extensions: apcu, mbstring
+          coverage: xdebug
+          ini-values: apc.enable_cli=1
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Run tests
+        run: XDEBUG_MODE=coverage vendor/bin/phpunit --coverage-text

.gitignore

@@ -0,0 +1,14 @@
+/.idea/
+###> symfony/framework-bundle ###
+/config/secrets/prod/prod.decrypt.private.php
+/public/bundles/
+/var/
+/vendor/
+###< symfony/framework-bundle ###
+
+
+###> phpunit/phpunit ###
+/phpunit.xml
+/.phpunit.cache/
+/bin/.phpunit.result.cache
+###< phpunit/phpunit ###

400.php

@@ -1,55 +0,0 @@
-<?php
-use Preauth\Env;
-global $auth;
-$env = new Env();
-header("http/1.1 {$env->getDeniedCode()} {$env->getDeniedTitle()}", true, $env->getDeniedCode());
-?>
-<!doctype html>
-<html lang="en">
-<head>
-  <meta charset="utf-8">
-  <title><?php echo $env->getTitle(); ?></title>
-  <meta name="viewport" content="width=device-width, initial-scale=1">
-  <!-- Begin Icons -->
-  <link rel="apple-touch-icon" sizes="180x180" href="https://<?php echo $auth->getBaseDomain(); ?>/apple-touch-icon.png">
-  <link rel="icon" type="image/png" sizes="32x32" href="https://<?php echo $auth->getBaseDomain(); ?>/favicon-32x32.png">
-  <link rel="icon" type="image/png" sizes="192x192" href="https://<?php echo $auth->getBaseDomain(); ?>/android-chrome-192x192.png">
-  <link rel="icon" type="image/png" sizes="16x16" href="https://<?php echo $auth->getBaseDomain(); ?>/favicon-16x16.png">
-  <link rel="manifest" href="https://<?php echo $auth->getBaseDomain(); ?>/site.webmanifest">
-  <meta name="apple-mobile-web-app-title" content="<?php echo $env->getTitle(); ?>">
-  <meta name="application-name" content="<?php echo $env->getTitle(); ?>">
-  <meta name="msapplication-TileColor" content="<?php echo $env->getColor(); ?>">
-  <meta name="theme-color" content="<?php echo $env->getColor(); ?>">
-  <!-- End Icons -->
-  <style>
-    * {
-      margin: 0;
-      padding: 0.25em;
-    }
-    html {
-      background-color: <?php echo $env->getColor(); ?>;
-      color: <?php echo $env->getTextColor(); ?>;
-      display: table;
-      font-family: sans-serif;
-      font-size: 1.5em;
-      height: 100%;
-      padding: 0;
-      text-align: center;
-      width: 100%;
-    }
-    body {
-      display: table-cell;
-      vertical-align: middle;
-    }
-    h1 {
-      font-size: 2.5em;
-      font-weight: normal;
-    }
-  </style>
-</head>
-<body>
-  <h1><?php echo $env->getTitle(); ?></h1>
-  <h2><?php echo $env->getDeniedTitle(); ?></h2>
-  <p><?php echo $env->getDeniedMessage(); ?></p>
-</body>
-</html>

500.php

@@ -1,54 +0,0 @@
-<?php
-use Preauth\Env;
-global $auth;
-$env = new Env();
-?>
-<!doctype html>
-<html lang="en">
-<head>
-  <meta charset="utf-8">
-  <title><?php echo $env->getTitle(); ?></title>
-  <meta name="viewport" content="width=device-width, initial-scale=1">
-  <!-- Begin Icons -->
-  <link rel="apple-touch-icon" sizes="180x180" href="https://<?php echo $auth->getBaseDomain(); ?>/apple-touch-icon.png">
-  <link rel="icon" type="image/png" sizes="32x32" href="https://<?php echo $auth->getBaseDomain(); ?>/favicon-32x32.png">
-  <link rel="icon" type="image/png" sizes="192x192" href="https://<?php echo $auth->getBaseDomain(); ?>/android-chrome-192x192.png">
-  <link rel="icon" type="image/png" sizes="16x16" href="https://<?php echo $auth->getBaseDomain(); ?>/favicon-16x16.png">
-  <link rel="manifest" href="https://<?php echo $auth->getBaseDomain(); ?>/site.webmanifest">
-  <meta name="apple-mobile-web-app-title" content="<?php echo $env->getTitle(); ?>">
-  <meta name="application-name" content="<?php echo $env->getTitle(); ?>">
-  <meta name="msapplication-TileColor" content="<?php echo $env->getColor(); ?>">
-  <meta name="theme-color" content="<?php echo $env->getColor(); ?>">
-  <!-- End Icons -->
-  <style>
-    * {
-      margin: 0;
-      padding: 0.25em;
-    }
-    html {
-      background-color: <?php echo $env->getColor(); ?>;
-      color: <?php echo $env->getTextColor(); ?>;
-      display: table;
-      font-family: sans-serif;
-      font-size: 1.5em;
-      height: 100%;
-      padding: 0;
-      text-align: center;
-      width: 100%;
-    }
-    body {
-      display: table-cell;
-      vertical-align: middle;
-    }
-    h1 {
-      font-size: 2.5em;
-      font-weight: normal;
-    }
-  </style>
-</head>
-<body>
-  <h1><?php echo $env->getTitle(); ?></h1>
-  <h2>Internal Server Error</h2>
-  <p>Review the logs for more details.</p>
-</body>
-</html>

Caddyfile

@@ -1,44 +1,7 @@
-# allow the pre-auth page to work
-preauth.example.com {
-	reverse_proxy preauth:9000 {
-		header_up X-Forwarded-Uri {uri}
-		header_down -X-Powered-By
-		rewrite /preauth.php
-		transport fastcgi {
-			root /preauth/
-			split .php
-		}
-	}
+http://
+root public/
+rewrite index.php
+php {
+	root /app/public
+	worker index.php
 }
-
-# if using caddy v2.9.x+ you can use this snippet
-# snippet to put the pre-auth system in front any service easily
-(preauth) {
-	reverse_proxy {args[0]} preauth:9000 {
-		method GET
-		header_up X-Forwarded-Uri {uri}
-		header_down -X-Powered-By
-		rewrite /preauth.php
-		transport fastcgi {
-			root /preauth/
-			split .php
-		}
-		@preauth_ok status 2xx
-		handle_response @preauth_ok {
-			copy_response_headers {
-				include Set-Cookie Location
-			}
-			{block}
-		}
-	}
-}
-
-# snippet usage: this will cause preauth to restrict access to
-# https://protected.example.com/secure
-protected.example.com {
-	import preauth /secure {
-		reverse_proxy protected-service:9000
-	}
-	reverse_proxy exposed-service:9000
-}
-

Dockerfile

@@ -1,34 +1,69 @@
-FROM php:8.4-fpm-alpine
+# use build image, to simplify final image
+FROM php:8.5-trixie AS build
 
-# get compose so we can install our php dependencies
+# install APCu and composer
+RUN pecl install apcu && \
+    docker-php-ext-enable apcu
 COPY --from=composer /usr/bin/composer /usr/bin/composer
+RUN apt-get update && \
+    apt-get install -y unzip git
 
-# app is stored here
-RUN mkdir /preauth
-WORKDIR /preauth
-COPY . /preauth/
+# symfony required environment variables
+ENV APP_DEBUG=0
+ENV APP_ENV=prod
+ENV APP_SHARE_DIR=/data/preauth
 
-# add php config for rate limit monitoring
-RUN mkdir -p /usr/local/etc/php/conf.d
-COPY preauth-php.ini /usr/local/etc/php/conf.d/preauth-php.ini
+# load application into build image
+RUN mkdir -p /data/preauth
+RUN mkdir -p /app/bin
+WORKDIR /app
+COPY ./bin/console   /app/bin/console
+COPY ./config        /app/config
+COPY ./public        /app/public
+COPY ./src           /app/src
+COPY ./templates     /app/templates
+COPY ./composer.json /app/composer.json
+COPY ./composer.lock /app/composer.lock
+COPY ./symfony.lock  /app/symfony.lock
 
-# login sessions are stored here
-RUN mkdir -p /tmp/data/sessions
+# install application dependencies
+RUN composer install --no-dev --optimize-autoloader
+RUN composer dump-env prod --empty
 
-# rate limit monitoring information is stored here
-RUN mkdir -p /tmp/data/monitor
+# start creating final image
+FROM dunglas/frankenphp:php8.5-trixie
 
-# fcgi command for the healthcheck
-RUN apk add fcgi
+# install APCu
+RUN pecl install apcu && \
+    docker-php-ext-enable apcu
 
-# install our php dependencies
-RUN composer install
+# symfony required environment variables
+ENV APP_DEBUG=0
+ENV APP_ENV=prod
+ENV APP_SHARE_DIR=/data/preauth
 
-EXPOSE 9000
+# load application into final image
+WORKDIR /app
+COPY --from=build /data/preauth /data/preauth
+COPY --from=build /app /app
 
-HEALTHCHECK --interval=5m --retries=3 --start-interval=5s --start-period=50s --timeout=5s \
-    CMD SCRIPT_NAME=/health.php SCRIPT_FILENAME=/preauth/health.php REQUEST_METHOD=GET \
-        cgi-fcgi -bind -connect localhost:9000 | grep 'online' || exit 1
+# configure container
+COPY ./Caddyfile /etc/frankenphp/Caddyfile
+RUN cp $PHP_INI_DIR/php.ini-production $PHP_INI_DIR/php.ini
+RUN echo 'expose_php = off' > $PHP_INI_DIR/conf.d/restrict.ini
+# console needs apc to manage cache
+RUN echo 'apc.enable_cli = on' > $PHP_INI_DIR/conf.d/console.ini
 
-ENTRYPOINT ["/preauth/init.sh"]
+# app uses var folder for cache storage
+VOLUME ["/config", "/data"]
 
+# runs http on standard port
+EXPOSE 80
+
+# healthcheck
+HEALTHCHECK --interval=5m \
+    --retries=3 \
+    --start-interval=1s \
+    --start-period=10s \
+    --timeout=2s \
+    CMD curl http://localhost || exit 1

bin/console

@@ -0,0 +1,21 @@
+#!/usr/bin/env php
+<?php
+
+use App\Kernel;
+use Symfony\Bundle\FrameworkBundle\Console\Application;
+
+if (!is_dir(dirname(__DIR__).'/vendor')) {
+    throw new LogicException('Dependencies are missing. Try running "composer install".');
+}
+
+if (!is_file(dirname(__DIR__).'/vendor/autoload_runtime.php')) {
+    throw new LogicException('Symfony Runtime is missing. Try running "composer require symfony/runtime".');
+}
+
+require_once dirname(__DIR__).'/vendor/autoload_runtime.php';
+
+return function (array $context) {
+    $kernel = new Kernel($context['APP_ENV'], (bool) $context['APP_DEBUG']);
+
+    return new Application($kernel);
+};

bin/franken.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+docker container rm preauth
+docker build . -t digtialadapt/preauth:dev
+docker run --name preauth \
+    -e APP_ENV=dev \
+    -e APP_DEBUG=true \
+    -e APP_SECRET=f88a1074691c40415be4439345b79f69 \
+    -e APP_SHARE_DIR=var/share \
+    -e DEFAULT_URI=http://localhost \
+    -v ./var/share:/app/var/share \
+    -p 8000:80 \
+    digtialadapt/preauth:dev

bin/phpunit

@@ -0,0 +1,4 @@
+#!/usr/bin/env php
+<?php
+
+require dirname(__DIR__).'/vendor/phpunit/phpunit/phpunit';

compose.yaml

@@ -1,19 +0,0 @@
-services:
-  preauth:
-    env_file:
-      # TODO rename ".env.example" to just ".env"
-      # edit USER_ID and GROUP_ID if needed
-      # set PREAUTH_KEY and PREAUTH_TOKEN after initial start to persist those settings
-      - .env
-    expose:
-      - 9000
-    image: digitaladapt/preauth
-    init: true
-    restart: unless-stopped
-    user: ${USER_ID}:${GROUP_ID}
-    volumes:
-      - preauth:/tmp/data
-
-volumes:
-  preauth:
-

composer.json

@@ -1,12 +1,82 @@
 {
+    "type": "project",
+    "license": "MIT",
+    "minimum-stability": "stable",
+    "prefer-stable": true,
+    "require": {
+        "php": ">=8.4",
+        "ext-ctype": "*",
+        "ext-iconv": "*",
+        "bacon/bacon-qr-code": "^3.1.1",
+        "runtime/frankenphp-symfony": "^1.0.0",
+        "spomky-labs/otphp": "^11.4.2",
+        "symfony/cache": "7.4.*",
+        "symfony/console": "7.4.*",
+        "symfony/flex": "^2.11",
+        "symfony/framework-bundle": "7.4.*",
+        "symfony/mime": "7.4.*",
+        "symfony/rate-limiter": "7.4.*",
+        "symfony/runtime": "7.4.*",
+        "symfony/twig-bundle": "7.4.*",
+        "symfony/uid": "7.4.*",
+        "symfony/yaml": "7.4.*"
+    },
+    "config": {
+        "allow-plugins": {
+            "php-http/discovery": true,
+            "symfony/flex": true,
+            "symfony/runtime": true
+        },
+        "bump-after-update": true,
+        "sort-packages": true
+    },
     "autoload": {
         "psr-4": {
-            "Preauth\\": "src/"
+            "App\\": "src/"
         }
     },
-    "require": {
-        "spomky-labs/otphp": "^11.3",
-        "symfony/http-foundation": "^7.3",
-        "symfony/uid": "^7.3"
+    "autoload-dev": {
+        "psr-4": {
+            "App\\Tests\\": "tests/"
+        }
+    },
+    "replace": {
+        "symfony/polyfill-ctype": "*",
+        "symfony/polyfill-iconv": "*",
+        "symfony/polyfill-php72": "*",
+        "symfony/polyfill-php73": "*",
+        "symfony/polyfill-php74": "*",
+        "symfony/polyfill-php80": "*",
+        "symfony/polyfill-php81": "*",
+        "symfony/polyfill-php82": "*"
+    },
+    "scripts": {
+        "auto-scripts": {
+            "cache:clear": "symfony-cmd",
+            "assets:install %PUBLIC_DIR%": "symfony-cmd"
+        },
+        "post-install-cmd": [
+            "@auto-scripts"
+        ],
+        "post-update-cmd": [
+            "@auto-scripts"
+        ]
+    },
+    "conflict": {
+        "symfony/symfony": "*"
+    },
+    "extra": {
+        "runtime": {
+            "class": "Runtime\\FrankenPhpSymfony\\Runtime"
+        },
+        "symfony": {
+            "allow-contrib": false,
+            "require": "7.4.*"
+        }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^13.2",
+        "symfony/browser-kit": "7.4.*",
+        "symfony/css-selector": "7.4.*"
     }
 }

config/bundles.php

@@ -0,0 +1,6 @@
+<?php
+
+return [
+    Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true],
+    Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true],
+];

config/packages/cache.yaml

@@ -0,0 +1,15 @@
+framework:
+    cache:
+        app: cache.adapter.filesystem
+        pools:
+            nonceCache:
+                adapters: cache.adapter.apcu
+            rateLimitCache:
+                adapters: cache.adapter.apcu
+            sessionCache:
+                adapters: cache.adapter.apcu
+            sessionStorage:
+                adapters: cache.adapter.filesystem
+
+        # Unique name of your app: used to compute stable namespaces for cache keys.
+        prefix_seed: digitaladapt/preauth

config/packages/framework.yaml

@@ -0,0 +1,9 @@
+# see https://symfony.com/doc/current/reference/configuration/framework.html
+framework:
+    secret: '%env(APP_SECRET)%'
+
+    trusted_proxies: 'private_ranges'
+    trusted_headers: ['x-forwarded-for', 'x-forwarded-host', 'x-forwarded-proto']
+
+    # Note that the session will be started ONLY if you read or write from it.
+    session: true

config/packages/rate_limiter.yaml

@@ -0,0 +1,15 @@
+framework:
+    rate_limiter:
+        burst:
+            policy: 'sliding_window'
+            limit: '%env(int:BURST_COUNT)%'
+            interval: '%env(int:BURST_TIME)% seconds'
+            cache_pool: 'rateLimitCache'
+        upper:
+            policy: 'sliding_window'
+            limit: '%env(int:UPPER_COUNT)%'
+            interval: '%env(int:UPPER_TIME)% seconds'
+            cache_pool: 'rateLimitCache'
+        login_limiter:
+            policy: compound
+            limiters: [burst, upper]

config/packages/routing.yaml

@@ -0,0 +1,8 @@
+framework:
+    router:
+        default_uri: 'http://localhost'
+
+when@prod:
+    framework:
+        router:
+            strict_requirements: null

config/packages/test/cache.yaml

@@ -0,0 +1,12 @@
+framework:
+    cache:
+        app: cache.adapter.array
+        pools:
+            nonceCache:
+                adapters: cache.adapter.array
+            rateLimitCache:
+                adapters: cache.adapter.array
+            sessionCache:
+                adapters: cache.adapter.array
+            sessionStorage:
+                adapters: cache.adapter.array

config/packages/test/framework.yaml

@@ -0,0 +1,4 @@
+framework:
+    test: true
+    session:
+        storage_factory_id: session.storage.factory.mock_file

config/packages/twig.yaml

@@ -0,0 +1,18 @@
+twig:
+    file_name_pattern: '*.twig'
+    strict_variables: true
+    globals:
+        env:
+            title: '%env(TITLE)%'
+            bg_color: '%env(BG_COLOR)%'
+            fg_color: '%env(FG_COLOR)%'
+            error_color: '%env(ERROR_COLOR)%'
+            id_name: '%env(ID_NAME)%'
+            token_name: '%env(TOKEN_NAME)%'
+            submit_name: '%env(SUBMIT_NAME)%'
+            error_message: '%env(ERROR_MESSAGE)%'
+            teapot_title: '%env(TEAPOT_TITLE)%'
+            teapot_message: '%env(TEAPOT_MESSAGE)%'
+            too_many_title: '%env(TOO_MANY_TITLE)%'
+            too_many_message: '%env(TOO_MANY_MESSAGE)%'
+            debug: '%env(SHELL_VERBOSITY)%'

config/preload.php

@@ -0,0 +1,8 @@
+<?php
+
+if (file_exists(dirname(__DIR__) .
+    '/var/cache/prod/App_KernelProdContainer.preload.php')
+) {
+    require dirname(__DIR__) .
+        '/var/cache/prod/App_KernelProdContainer.preload.php';
+}

config/reference.php

@@ -0,0 +1,844 @@
+<?php
+
+// This file is auto-generated and is for apps only. Bundles SHOULD NOT rely on its content.
+
+namespace Symfony\Component\DependencyInjection\Loader\Configurator;
+
+use Symfony\Component\Config\Loader\ParamConfigurator as Param;
+
+/**
+ * This class provides array-shapes for configuring the services and bundles of an application.
+ *
+ * Services declared with the config() method below are autowired and autoconfigured by default.
+ *
+ * This is for apps only. Bundles SHOULD NOT use it.
+ *
+ * Example:
+ *
+ *     ```php
+ *     // config/services.php
+ *     namespace Symfony\Component\DependencyInjection\Loader\Configurator;
+ *
+ *     return App::config([
+ *         'services' => [
+ *             'App\\' => [
+ *                 'resource' => '../src/',
+ *             ],
+ *         ],
+ *     ]);
+ *     ```
+ *
+ * @psalm-type ImportsConfig = list<string|array{
+ *     resource: string,
+ *     type?: string|null,
+ *     ignore_errors?: bool,
+ * }>
+ * @psalm-type ParametersConfig = array<string, scalar|\UnitEnum|array<scalar|\UnitEnum|array<mixed>|Param|null>|Param|null>
+ * @psalm-type ArgumentsType = list<mixed>|array<string, mixed>
+ * @psalm-type CallType = array<string, ArgumentsType>|array{0:string, 1?:ArgumentsType, 2?:bool}|array{method:string, arguments?:ArgumentsType, returns_clone?:bool}
+ * @psalm-type TagsType = list<string|array<string, array<string, mixed>>> // arrays inside the list must have only one element, with the tag name as the key
+ * @psalm-type CallbackType = string|array{0:string|ReferenceConfigurator,1:string}|\Closure|ReferenceConfigurator
+ * @psalm-type DeprecationType = array{package: string, version: string, message?: string}
+ * @psalm-type DefaultsType = array{
+ *     public?: bool,
+ *     tags?: TagsType,
+ *     resource_tags?: TagsType,
+ *     autowire?: bool,
+ *     autoconfigure?: bool,
+ *     bind?: array<string, mixed>,
+ * }
+ * @psalm-type InstanceofType = array{
+ *     shared?: bool,
+ *     lazy?: bool|string,
+ *     public?: bool,
+ *     properties?: array<string, mixed>,
+ *     configurator?: CallbackType,
+ *     calls?: list<CallType>,
+ *     tags?: TagsType,
+ *     resource_tags?: TagsType,
+ *     autowire?: bool,
+ *     bind?: array<string, mixed>,
+ *     constructor?: string,
+ * }
+ * @psalm-type DefinitionType = array{
+ *     class?: string,
+ *     file?: string,
+ *     parent?: string,
+ *     shared?: bool,
+ *     synthetic?: bool,
+ *     lazy?: bool|string,
+ *     public?: bool,
+ *     abstract?: bool,
+ *     deprecated?: DeprecationType,
+ *     factory?: CallbackType,
+ *     configurator?: CallbackType,
+ *     arguments?: ArgumentsType,
+ *     properties?: array<string, mixed>,
+ *     calls?: list<CallType>,
+ *     tags?: TagsType,
+ *     resource_tags?: TagsType,
+ *     decorates?: string,
+ *     decoration_inner_name?: string,
+ *     decoration_priority?: int,
+ *     decoration_on_invalid?: 'exception'|'ignore'|null,
+ *     autowire?: bool,
+ *     autoconfigure?: bool,
+ *     bind?: array<string, mixed>,
+ *     constructor?: string,
+ *     from_callable?: CallbackType,
+ * }
+ * @psalm-type AliasType = string|array{
+ *     alias: string,
+ *     public?: bool,
+ *     deprecated?: DeprecationType,
+ * }
+ * @psalm-type PrototypeType = array{
+ *     resource: string,
+ *     namespace?: string,
+ *     exclude?: string|list<string>,
+ *     parent?: string,
+ *     shared?: bool,
+ *     lazy?: bool|string,
+ *     public?: bool,
+ *     abstract?: bool,
+ *     deprecated?: DeprecationType,
+ *     factory?: CallbackType,
+ *     arguments?: ArgumentsType,
+ *     properties?: array<string, mixed>,
+ *     configurator?: CallbackType,
+ *     calls?: list<CallType>,
+ *     tags?: TagsType,
+ *     resource_tags?: TagsType,
+ *     autowire?: bool,
+ *     autoconfigure?: bool,
+ *     bind?: array<string, mixed>,
+ *     constructor?: string,
+ * }
+ * @psalm-type StackType = array{
+ *     stack: list<DefinitionType|AliasType|PrototypeType|array<class-string, ArgumentsType|null>>,
+ *     public?: bool,
+ *     deprecated?: DeprecationType,
+ * }
+ * @psalm-type ServicesConfig = array{
+ *     _defaults?: DefaultsType,
+ *     _instanceof?: InstanceofType,
+ *     ...<string, DefinitionType|AliasType|PrototypeType|StackType|ArgumentsType|null>
+ * }
+ * @psalm-type ExtensionType = array<string, mixed>
+ * @psalm-type FrameworkConfig = array{
+ *     secret?: scalar|Param|null,
+ *     http_method_override?: bool|Param, // Set true to enable support for the '_method' request parameter to determine the intended HTTP method on POST requests. // Default: false
+ *     allowed_http_method_override?: list<string|Param>|null,
+ *     trust_x_sendfile_type_header?: scalar|Param|null, // Set true to enable support for xsendfile in binary file responses. // Default: "%env(bool:default::SYMFONY_TRUST_X_SENDFILE_TYPE_HEADER)%"
+ *     ide?: scalar|Param|null, // Default: "%env(default::SYMFONY_IDE)%"
+ *     test?: bool|Param,
+ *     default_locale?: scalar|Param|null, // Default: "en"
+ *     set_locale_from_accept_language?: bool|Param, // Whether to use the Accept-Language HTTP header to set the Request locale (only when the "_locale" request attribute is not passed). // Default: false
+ *     set_content_language_from_locale?: bool|Param, // Whether to set the Content-Language HTTP header on the Response using the Request locale. // Default: false
+ *     enabled_locales?: list<scalar|Param|null>,
+ *     trusted_hosts?: list<scalar|Param|null>,
+ *     trusted_proxies?: mixed, // Default: ["%env(default::SYMFONY_TRUSTED_PROXIES)%"]
+ *     trusted_headers?: list<scalar|Param|null>,
+ *     error_controller?: scalar|Param|null, // Default: "error_controller"
+ *     handle_all_throwables?: bool|Param, // HttpKernel will handle all kinds of \Throwable. // Default: true
+ *     csrf_protection?: bool|array{
+ *         enabled?: scalar|Param|null, // Default: null
+ *         stateless_token_ids?: list<scalar|Param|null>,
+ *         check_header?: scalar|Param|null, // Whether to check the CSRF token in a header in addition to a cookie when using stateless protection. // Default: false
+ *         cookie_name?: scalar|Param|null, // The name of the cookie to use when using stateless protection. // Default: "csrf-token"
+ *     },
+ *     form?: bool|array{ // Form configuration
+ *         enabled?: bool|Param, // Default: false
+ *         csrf_protection?: bool|array{
+ *             enabled?: scalar|Param|null, // Default: null
+ *             token_id?: scalar|Param|null, // Default: null
+ *             field_name?: scalar|Param|null, // Default: "_token"
+ *             field_attr?: array<string, scalar|Param|null>,
+ *         },
+ *     },
+ *     http_cache?: bool|array{ // HTTP cache configuration
+ *         enabled?: bool|Param, // Default: false
+ *         debug?: bool|Param, // Default: "%kernel.debug%"
+ *         trace_level?: "none"|"short"|"full"|Param,
+ *         trace_header?: scalar|Param|null,
+ *         default_ttl?: int|Param,
+ *         private_headers?: list<scalar|Param|null>,
+ *         skip_response_headers?: list<scalar|Param|null>,
+ *         allow_reload?: bool|Param,
+ *         allow_revalidate?: bool|Param,
+ *         stale_while_revalidate?: int|Param,
+ *         stale_if_error?: int|Param,
+ *         terminate_on_cache_hit?: bool|Param,
+ *     },
+ *     esi?: bool|array{ // ESI configuration
+ *         enabled?: bool|Param, // Default: false
+ *     },
+ *     ssi?: bool|array{ // SSI configuration
+ *         enabled?: bool|Param, // Default: false
+ *     },
+ *     fragments?: bool|array{ // Fragments configuration
+ *         enabled?: bool|Param, // Default: false
+ *         hinclude_default_template?: scalar|Param|null, // Default: null
+ *         path?: scalar|Param|null, // Default: "/_fragment"
+ *     },
+ *     profiler?: bool|array{ // Profiler configuration
+ *         enabled?: bool|Param, // Default: false
+ *         collect?: bool|Param, // Default: true
+ *         collect_parameter?: scalar|Param|null, // The name of the parameter to use to enable or disable collection on a per request basis. // Default: null
+ *         only_exceptions?: bool|Param, // Default: false
+ *         only_main_requests?: bool|Param, // Default: false
+ *         dsn?: scalar|Param|null, // Default: "file:%kernel.cache_dir%/profiler"
+ *         collect_serializer_data?: bool|Param, // Enables the serializer data collector and profiler panel. // Default: false
+ *     },
+ *     workflows?: bool|array{
+ *         enabled?: bool|Param, // Default: false
+ *         workflows?: array<string, array{ // Default: []
+ *             audit_trail?: bool|array{
+ *                 enabled?: bool|Param, // Default: false
+ *             },
+ *             type?: "workflow"|"state_machine"|Param, // Default: "state_machine"
+ *             marking_store?: array{
+ *                 type?: "method"|Param,
+ *                 property?: scalar|Param|null,
+ *                 service?: scalar|Param|null,
+ *             },
+ *             supports?: list<scalar|Param|null>,
+ *             definition_validators?: list<scalar|Param|null>,
+ *             support_strategy?: scalar|Param|null,
+ *             initial_marking?: list<scalar|Param|null>,
+ *             events_to_dispatch?: list<string|Param>|null,
+ *             places?: list<array{ // Default: []
+ *                 name?: scalar|Param|null,
+ *                 metadata?: array<string, mixed>,
+ *             }>,
+ *             transitions?: list<array{ // Default: []
+ *                 name?: string|Param,
+ *                 guard?: string|Param, // An expression to block the transition.
+ *                 from?: list<array{ // Default: []
+ *                     place?: string|Param,
+ *                     weight?: int|Param, // Default: 1
+ *                 }>,
+ *                 to?: list<array{ // Default: []
+ *                     place?: string|Param,
+ *                     weight?: int|Param, // Default: 1
+ *                 }>,
+ *                 weight?: int|Param, // Default: 1
+ *                 metadata?: array<string, mixed>,
+ *             }>,
+ *             metadata?: array<string, mixed>,
+ *         }>,
+ *     },
+ *     router?: bool|array{ // Router configuration
+ *         enabled?: bool|Param, // Default: false
+ *         resource?: scalar|Param|null,
+ *         type?: scalar|Param|null,
+ *         cache_dir?: scalar|Param|null, // Deprecated: Setting the "framework.router.cache_dir.cache_dir" configuration option is deprecated. It will be removed in version 8.0. // Default: "%kernel.build_dir%"
+ *         default_uri?: scalar|Param|null, // The default URI used to generate URLs in a non-HTTP context. // Default: null
+ *         http_port?: scalar|Param|null, // Default: 80
+ *         https_port?: scalar|Param|null, // Default: 443
+ *         strict_requirements?: scalar|Param|null, // set to true to throw an exception when a parameter does not match the requirements set to false to disable exceptions when a parameter does not match the requirements (and return null instead) set to null to disable parameter checks against requirements 'true' is the preferred configuration in development mode, while 'false' or 'null' might be preferred in production // Default: true
+ *         utf8?: bool|Param, // Default: true
+ *     },
+ *     session?: bool|array{ // Session configuration
+ *         enabled?: bool|Param, // Default: false
+ *         storage_factory_id?: scalar|Param|null, // Default: "session.storage.factory.native"
+ *         handler_id?: scalar|Param|null, // Defaults to using the native session handler, or to the native *file* session handler if "save_path" is not null.
+ *         name?: scalar|Param|null,
+ *         cookie_lifetime?: scalar|Param|null,
+ *         cookie_path?: scalar|Param|null,
+ *         cookie_domain?: scalar|Param|null,
+ *         cookie_secure?: true|false|"auto"|Param, // Default: "auto"
+ *         cookie_httponly?: bool|Param, // Default: true
+ *         cookie_samesite?: null|"lax"|"strict"|"none"|Param, // Default: "lax"
+ *         use_cookies?: bool|Param,
+ *         gc_divisor?: scalar|Param|null,
+ *         gc_probability?: scalar|Param|null,
+ *         gc_maxlifetime?: scalar|Param|null,
+ *         save_path?: scalar|Param|null, // Defaults to "%kernel.cache_dir%/sessions" if the "handler_id" option is not null.
+ *         metadata_update_threshold?: int|Param, // Seconds to wait between 2 session metadata updates. // Default: 0
+ *         sid_length?: int|Param, // Deprecated: Setting the "framework.session.sid_length.sid_length" configuration option is deprecated. It will be removed in version 8.0. No alternative is provided as PHP 8.4 has deprecated the related option.
+ *         sid_bits_per_character?: int|Param, // Deprecated: Setting the "framework.session.sid_bits_per_character.sid_bits_per_character" configuration option is deprecated. It will be removed in version 8.0. No alternative is provided as PHP 8.4 has deprecated the related option.
+ *     },
+ *     request?: bool|array{ // Request configuration
+ *         enabled?: bool|Param, // Default: false
+ *         formats?: array<string, string|list<scalar|Param|null>>,
+ *     },
+ *     assets?: bool|array{ // Assets configuration
+ *         enabled?: bool|Param, // Default: false
+ *         strict_mode?: bool|Param, // Throw an exception if an entry is missing from the manifest.json. // Default: false
+ *         version_strategy?: scalar|Param|null, // Default: null
+ *         version?: scalar|Param|null, // Default: null
+ *         version_format?: scalar|Param|null, // Default: "%%s?%%s"
+ *         json_manifest_path?: scalar|Param|null, // Default: null
+ *         base_path?: scalar|Param|null, // Default: ""
+ *         base_urls?: list<scalar|Param|null>,
+ *         packages?: array<string, array{ // Default: []
+ *             strict_mode?: bool|Param, // Throw an exception if an entry is missing from the manifest.json. // Default: false
+ *             version_strategy?: scalar|Param|null, // Default: null
+ *             version?: scalar|Param|null,
+ *             version_format?: scalar|Param|null, // Default: null
+ *             json_manifest_path?: scalar|Param|null, // Default: null
+ *             base_path?: scalar|Param|null, // Default: ""
+ *             base_urls?: list<scalar|Param|null>,
+ *         }>,
+ *     },
+ *     asset_mapper?: bool|array{ // Asset Mapper configuration
+ *         enabled?: bool|Param, // Default: false
+ *         paths?: array<string, scalar|Param|null>,
+ *         excluded_patterns?: list<scalar|Param|null>,
+ *         exclude_dotfiles?: bool|Param, // If true, any files starting with "." will be excluded from the asset mapper. // Default: true
+ *         server?: bool|Param, // If true, a "dev server" will return the assets from the public directory (true in "debug" mode only by default). // Default: true
+ *         public_prefix?: scalar|Param|null, // The public path where the assets will be written to (and served from when "server" is true). // Default: "/assets/"
+ *         missing_import_mode?: "strict"|"warn"|"ignore"|Param, // Behavior if an asset cannot be found when imported from JavaScript or CSS files - e.g. "import './non-existent.js'". "strict" means an exception is thrown, "warn" means a warning is logged, "ignore" means the import is left as-is. // Default: "warn"
+ *         extensions?: array<string, scalar|Param|null>,
+ *         importmap_path?: scalar|Param|null, // The path of the importmap.php file. // Default: "%kernel.project_dir%/importmap.php"
+ *         importmap_polyfill?: scalar|Param|null, // The importmap name that will be used to load the polyfill. Set to false to disable. // Default: "es-module-shims"
+ *         importmap_script_attributes?: array<string, scalar|Param|null>,
+ *         vendor_dir?: scalar|Param|null, // The directory to store JavaScript vendors. // Default: "%kernel.project_dir%/assets/vendor"
+ *         precompress?: bool|array{ // Precompress assets with Brotli, Zstandard and gzip.
+ *             enabled?: bool|Param, // Default: false
+ *             formats?: list<scalar|Param|null>,
+ *             extensions?: list<scalar|Param|null>,
+ *         },
+ *     },
+ *     translator?: bool|array{ // Translator configuration
+ *         enabled?: bool|Param, // Default: false
+ *         fallbacks?: list<scalar|Param|null>,
+ *         logging?: bool|Param, // Default: false
+ *         formatter?: scalar|Param|null, // Default: "translator.formatter.default"
+ *         cache_dir?: scalar|Param|null, // Default: "%kernel.cache_dir%/translations"
+ *         default_path?: scalar|Param|null, // The default path used to load translations. // Default: "%kernel.project_dir%/translations"
+ *         paths?: list<scalar|Param|null>,
+ *         pseudo_localization?: bool|array{
+ *             enabled?: bool|Param, // Default: false
+ *             accents?: bool|Param, // Default: true
+ *             expansion_factor?: float|Param, // Default: 1.0
+ *             brackets?: bool|Param, // Default: true
+ *             parse_html?: bool|Param, // Default: false
+ *             localizable_html_attributes?: list<scalar|Param|null>,
+ *         },
+ *         providers?: array<string, array{ // Default: []
+ *             dsn?: scalar|Param|null,
+ *             domains?: list<scalar|Param|null>,
+ *             locales?: list<scalar|Param|null>,
+ *         }>,
+ *         globals?: array<string, string|array{ // Default: []
+ *             value?: mixed,
+ *             message?: string|Param,
+ *             parameters?: array<string, scalar|Param|null>,
+ *             domain?: string|Param,
+ *         }>,
+ *     },
+ *     validation?: bool|array{ // Validation configuration
+ *         enabled?: bool|Param, // Default: false
+ *         cache?: scalar|Param|null, // Deprecated: Setting the "framework.validation.cache.cache" configuration option is deprecated. It will be removed in version 8.0.
+ *         enable_attributes?: bool|Param, // Default: true
+ *         static_method?: list<scalar|Param|null>,
+ *         translation_domain?: scalar|Param|null, // Default: "validators"
+ *         email_validation_mode?: "html5"|"html5-allow-no-tld"|"strict"|"loose"|Param, // Default: "html5"
+ *         mapping?: array{
+ *             paths?: list<scalar|Param|null>,
+ *         },
+ *         not_compromised_password?: bool|array{
+ *             enabled?: bool|Param, // When disabled, compromised passwords will be accepted as valid. // Default: true
+ *             endpoint?: scalar|Param|null, // API endpoint for the NotCompromisedPassword Validator. // Default: null
+ *         },
+ *         disable_translation?: bool|Param, // Default: false
+ *         auto_mapping?: array<string, array{ // Default: []
+ *             services?: list<scalar|Param|null>,
+ *         }>,
+ *     },
+ *     annotations?: bool|array{
+ *         enabled?: bool|Param, // Default: false
+ *     },
+ *     serializer?: bool|array{ // Serializer configuration
+ *         enabled?: bool|Param, // Default: false
+ *         enable_attributes?: bool|Param, // Default: true
+ *         name_converter?: scalar|Param|null,
+ *         circular_reference_handler?: scalar|Param|null,
+ *         max_depth_handler?: scalar|Param|null,
+ *         mapping?: array{
+ *             paths?: list<scalar|Param|null>,
+ *         },
+ *         default_context?: array<string, mixed>,
+ *         named_serializers?: array<string, array{ // Default: []
+ *             name_converter?: scalar|Param|null,
+ *             default_context?: array<string, mixed>,
+ *             include_built_in_normalizers?: bool|Param, // Whether to include the built-in normalizers // Default: true
+ *             include_built_in_encoders?: bool|Param, // Whether to include the built-in encoders // Default: true
+ *         }>,
+ *     },
+ *     property_access?: bool|array{ // Property access configuration
+ *         enabled?: bool|Param, // Default: false
+ *         magic_call?: bool|Param, // Default: false
+ *         magic_get?: bool|Param, // Default: true
+ *         magic_set?: bool|Param, // Default: true
+ *         throw_exception_on_invalid_index?: bool|Param, // Default: false
+ *         throw_exception_on_invalid_property_path?: bool|Param, // Default: true
+ *     },
+ *     type_info?: bool|array{ // Type info configuration
+ *         enabled?: bool|Param, // Default: false
+ *         aliases?: array<string, scalar|Param|null>,
+ *     },
+ *     property_info?: bool|array{ // Property info configuration
+ *         enabled?: bool|Param, // Default: false
+ *         with_constructor_extractor?: bool|Param, // Registers the constructor extractor.
+ *     },
+ *     cache?: array{ // Cache configuration
+ *         prefix_seed?: scalar|Param|null, // Used to namespace cache keys when using several apps with the same shared backend. // Default: "_%kernel.project_dir%.%kernel.container_class%"
+ *         app?: scalar|Param|null, // App related cache pools configuration. // Default: "cache.adapter.filesystem"
+ *         system?: scalar|Param|null, // System related cache pools configuration. // Default: "cache.adapter.system"
+ *         directory?: scalar|Param|null, // Default: "%kernel.share_dir%/pools/app"
+ *         default_psr6_provider?: scalar|Param|null,
+ *         default_redis_provider?: scalar|Param|null, // Default: "redis://localhost"
+ *         default_valkey_provider?: scalar|Param|null, // Default: "valkey://localhost"
+ *         default_memcached_provider?: scalar|Param|null, // Default: "memcached://localhost"
+ *         default_doctrine_dbal_provider?: scalar|Param|null, // Default: "database_connection"
+ *         default_pdo_provider?: scalar|Param|null, // Default: null
+ *         pools?: array<string, array{ // Default: []
+ *             adapters?: list<scalar|Param|null>,
+ *             tags?: scalar|Param|null, // Default: null
+ *             public?: bool|Param, // Default: false
+ *             default_lifetime?: scalar|Param|null, // Default lifetime of the pool.
+ *             provider?: scalar|Param|null, // Overwrite the setting from the default provider for this adapter.
+ *             early_expiration_message_bus?: scalar|Param|null,
+ *             clearer?: scalar|Param|null,
+ *         }>,
+ *     },
+ *     php_errors?: array{ // PHP errors handling configuration
+ *         log?: mixed, // Use the application logger instead of the PHP logger for logging PHP errors. // Default: true
+ *         throw?: bool|Param, // Throw PHP errors as \ErrorException instances. // Default: true
+ *     },
+ *     exceptions?: array<string, array{ // Default: []
+ *         log_level?: scalar|Param|null, // The level of log message. Null to let Symfony decide. // Default: null
+ *         status_code?: scalar|Param|null, // The status code of the response. Null or 0 to let Symfony decide. // Default: null
+ *         log_channel?: scalar|Param|null, // The channel of log message. Null to let Symfony decide. // Default: null
+ *     }>,
+ *     web_link?: bool|array{ // Web links configuration
+ *         enabled?: bool|Param, // Default: false
+ *     },
+ *     lock?: bool|string|array{ // Lock configuration
+ *         enabled?: bool|Param, // Default: false
+ *         resources?: array<string, string|list<scalar|Param|null>>,
+ *     },
+ *     semaphore?: bool|string|array{ // Semaphore configuration
+ *         enabled?: bool|Param, // Default: false
+ *         resources?: array<string, scalar|Param|null>,
+ *     },
+ *     messenger?: bool|array{ // Messenger configuration
+ *         enabled?: bool|Param, // Default: false
+ *         routing?: array<string, string|array{ // Default: []
+ *             senders?: list<scalar|Param|null>,
+ *         }>,
+ *         serializer?: array{
+ *             default_serializer?: scalar|Param|null, // Service id to use as the default serializer for the transports. // Default: "messenger.transport.native_php_serializer"
+ *             symfony_serializer?: array{
+ *                 format?: scalar|Param|null, // Serialization format for the messenger.transport.symfony_serializer service (which is not the serializer used by default). // Default: "json"
+ *                 context?: array<string, mixed>,
+ *             },
+ *         },
+ *         transports?: array<string, string|array{ // Default: []
+ *             dsn?: scalar|Param|null,
+ *             serializer?: scalar|Param|null, // Service id of a custom serializer to use. // Default: null
+ *             options?: array<string, mixed>,
+ *             failure_transport?: scalar|Param|null, // Transport name to send failed messages to (after all retries have failed). // Default: null
+ *             retry_strategy?: string|array{
+ *                 service?: scalar|Param|null, // Service id to override the retry strategy entirely. // Default: null
+ *                 max_retries?: int|Param, // Default: 3
+ *                 delay?: int|Param, // Time in ms to delay (or the initial value when multiplier is used). // Default: 1000
+ *                 multiplier?: float|Param, // If greater than 1, delay will grow exponentially for each retry: this delay = (delay * (multiple ^ retries)). // Default: 2
+ *                 max_delay?: int|Param, // Max time in ms that a retry should ever be delayed (0 = infinite). // Default: 0
+ *                 jitter?: float|Param, // Randomness to apply to the delay (between 0 and 1). // Default: 0.1
+ *             },
+ *             rate_limiter?: scalar|Param|null, // Rate limiter name to use when processing messages. // Default: null
+ *         }>,
+ *         failure_transport?: scalar|Param|null, // Transport name to send failed messages to (after all retries have failed). // Default: null
+ *         stop_worker_on_signals?: list<scalar|Param|null>,
+ *         default_bus?: scalar|Param|null, // Default: null
+ *         buses?: array<string, array{ // Default: {"messenger.bus.default":{"default_middleware":{"enabled":true,"allow_no_handlers":false,"allow_no_senders":true},"middleware":[]}}
+ *             default_middleware?: bool|string|array{
+ *                 enabled?: bool|Param, // Default: true
+ *                 allow_no_handlers?: bool|Param, // Default: false
+ *                 allow_no_senders?: bool|Param, // Default: true
+ *             },
+ *             middleware?: list<string|array{ // Default: []
+ *                 id?: scalar|Param|null,
+ *                 arguments?: list<mixed>,
+ *             }>,
+ *         }>,
+ *     },
+ *     scheduler?: bool|array{ // Scheduler configuration
+ *         enabled?: bool|Param, // Default: false
+ *     },
+ *     disallow_search_engine_index?: bool|Param, // Enabled by default when debug is enabled. // Default: true
+ *     http_client?: bool|array{ // HTTP Client configuration
+ *         enabled?: bool|Param, // Default: false
+ *         max_host_connections?: int|Param, // The maximum number of connections to a single host.
+ *         default_options?: array{
+ *             headers?: array<string, mixed>,
+ *             vars?: array<string, mixed>,
+ *             max_redirects?: int|Param, // The maximum number of redirects to follow.
+ *             http_version?: scalar|Param|null, // The default HTTP version, typically 1.1 or 2.0, leave to null for the best version.
+ *             resolve?: array<string, scalar|Param|null>,
+ *             proxy?: scalar|Param|null, // The URL of the proxy to pass requests through or null for automatic detection.
+ *             no_proxy?: scalar|Param|null, // A comma separated list of hosts that do not require a proxy to be reached.
+ *             timeout?: float|Param, // The idle timeout, defaults to the "default_socket_timeout" ini parameter.
+ *             max_duration?: float|Param, // The maximum execution time for the request+response as a whole.
+ *             bindto?: scalar|Param|null, // A network interface name, IP address, a host name or a UNIX socket to bind to.
+ *             verify_peer?: bool|Param, // Indicates if the peer should be verified in a TLS context.
+ *             verify_host?: bool|Param, // Indicates if the host should exist as a certificate common name.
+ *             cafile?: scalar|Param|null, // A certificate authority file.
+ *             capath?: scalar|Param|null, // A directory that contains multiple certificate authority files.
+ *             local_cert?: scalar|Param|null, // A PEM formatted certificate file.
+ *             local_pk?: scalar|Param|null, // A private key file.
+ *             passphrase?: scalar|Param|null, // The passphrase used to encrypt the "local_pk" file.
+ *             ciphers?: scalar|Param|null, // A list of TLS ciphers separated by colons, commas or spaces (e.g. "RC3-SHA:TLS13-AES-128-GCM-SHA256"...)
+ *             peer_fingerprint?: array{ // Associative array: hashing algorithm => hash(es).
+ *                 sha1?: mixed,
+ *                 pin-sha256?: mixed,
+ *                 md5?: mixed,
+ *             },
+ *             crypto_method?: scalar|Param|null, // The minimum version of TLS to accept; must be one of STREAM_CRYPTO_METHOD_TLSv*_CLIENT constants.
+ *             extra?: array<string, mixed>,
+ *             rate_limiter?: scalar|Param|null, // Rate limiter name to use for throttling requests. // Default: null
+ *             caching?: bool|array{ // Caching configuration.
+ *                 enabled?: bool|Param, // Default: false
+ *                 cache_pool?: string|Param, // The taggable cache pool to use for storing the responses. // Default: "cache.http_client"
+ *                 shared?: bool|Param, // Indicates whether the cache is shared (public) or private. // Default: true
+ *                 max_ttl?: int|Param, // The maximum TTL (in seconds) allowed for cached responses. Null means no cap. // Default: null
+ *             },
+ *             retry_failed?: bool|array{
+ *                 enabled?: bool|Param, // Default: false
+ *                 retry_strategy?: scalar|Param|null, // service id to override the retry strategy. // Default: null
+ *                 http_codes?: array<string, array{ // Default: []
+ *                     code?: int|Param,
+ *                     methods?: list<string|Param>,
+ *                 }>,
+ *                 max_retries?: int|Param, // Default: 3
+ *                 delay?: int|Param, // Time in ms to delay (or the initial value when multiplier is used). // Default: 1000
+ *                 multiplier?: float|Param, // If greater than 1, delay will grow exponentially for each retry: delay * (multiple ^ retries). // Default: 2
+ *                 max_delay?: int|Param, // Max time in ms that a retry should ever be delayed (0 = infinite). // Default: 0
+ *                 jitter?: float|Param, // Randomness in percent (between 0 and 1) to apply to the delay. // Default: 0.1
+ *             },
+ *         },
+ *         mock_response_factory?: scalar|Param|null, // The id of the service that should generate mock responses. It should be either an invokable or an iterable.
+ *         scoped_clients?: array<string, string|array{ // Default: []
+ *             scope?: scalar|Param|null, // The regular expression that the request URL must match before adding the other options. When none is provided, the base URI is used instead.
+ *             base_uri?: scalar|Param|null, // The URI to resolve relative URLs, following rules in RFC 3985, section 2.
+ *             auth_basic?: scalar|Param|null, // An HTTP Basic authentication "username:password".
+ *             auth_bearer?: scalar|Param|null, // A token enabling HTTP Bearer authorization.
+ *             auth_ntlm?: scalar|Param|null, // A "username:password" pair to use Microsoft NTLM authentication (requires the cURL extension).
+ *             query?: array<string, scalar|Param|null>,
+ *             headers?: array<string, mixed>,
+ *             max_redirects?: int|Param, // The maximum number of redirects to follow.
+ *             http_version?: scalar|Param|null, // The default HTTP version, typically 1.1 or 2.0, leave to null for the best version.
+ *             resolve?: array<string, scalar|Param|null>,
+ *             proxy?: scalar|Param|null, // The URL of the proxy to pass requests through or null for automatic detection.
+ *             no_proxy?: scalar|Param|null, // A comma separated list of hosts that do not require a proxy to be reached.
+ *             timeout?: float|Param, // The idle timeout, defaults to the "default_socket_timeout" ini parameter.
+ *             max_duration?: float|Param, // The maximum execution time for the request+response as a whole.
+ *             bindto?: scalar|Param|null, // A network interface name, IP address, a host name or a UNIX socket to bind to.
+ *             verify_peer?: bool|Param, // Indicates if the peer should be verified in a TLS context.
+ *             verify_host?: bool|Param, // Indicates if the host should exist as a certificate common name.
+ *             cafile?: scalar|Param|null, // A certificate authority file.
+ *             capath?: scalar|Param|null, // A directory that contains multiple certificate authority files.
+ *             local_cert?: scalar|Param|null, // A PEM formatted certificate file.
+ *             local_pk?: scalar|Param|null, // A private key file.
+ *             passphrase?: scalar|Param|null, // The passphrase used to encrypt the "local_pk" file.
+ *             ciphers?: scalar|Param|null, // A list of TLS ciphers separated by colons, commas or spaces (e.g. "RC3-SHA:TLS13-AES-128-GCM-SHA256"...).
+ *             peer_fingerprint?: array{ // Associative array: hashing algorithm => hash(es).
+ *                 sha1?: mixed,
+ *                 pin-sha256?: mixed,
+ *                 md5?: mixed,
+ *             },
+ *             crypto_method?: scalar|Param|null, // The minimum version of TLS to accept; must be one of STREAM_CRYPTO_METHOD_TLSv*_CLIENT constants.
+ *             extra?: array<string, mixed>,
+ *             rate_limiter?: scalar|Param|null, // Rate limiter name to use for throttling requests. // Default: null
+ *             caching?: bool|array{ // Caching configuration.
+ *                 enabled?: bool|Param, // Default: false
+ *                 cache_pool?: string|Param, // The taggable cache pool to use for storing the responses. // Default: "cache.http_client"
+ *                 shared?: bool|Param, // Indicates whether the cache is shared (public) or private. // Default: true
+ *                 max_ttl?: int|Param, // The maximum TTL (in seconds) allowed for cached responses. Null means no cap. // Default: null
+ *             },
+ *             retry_failed?: bool|array{
+ *                 enabled?: bool|Param, // Default: false
+ *                 retry_strategy?: scalar|Param|null, // service id to override the retry strategy. // Default: null
+ *                 http_codes?: array<string, array{ // Default: []
+ *                     code?: int|Param,
+ *                     methods?: list<string|Param>,
+ *                 }>,
+ *                 max_retries?: int|Param, // Default: 3
+ *                 delay?: int|Param, // Time in ms to delay (or the initial value when multiplier is used). // Default: 1000
+ *                 multiplier?: float|Param, // If greater than 1, delay will grow exponentially for each retry: delay * (multiple ^ retries). // Default: 2
+ *                 max_delay?: int|Param, // Max time in ms that a retry should ever be delayed (0 = infinite). // Default: 0
+ *                 jitter?: float|Param, // Randomness in percent (between 0 and 1) to apply to the delay. // Default: 0.1
+ *             },
+ *         }>,
+ *     },
+ *     mailer?: bool|array{ // Mailer configuration
+ *         enabled?: bool|Param, // Default: false
+ *         message_bus?: scalar|Param|null, // The message bus to use. Defaults to the default bus if the Messenger component is installed. // Default: null
+ *         dsn?: scalar|Param|null, // Default: null
+ *         transports?: array<string, scalar|Param|null>,
+ *         envelope?: array{ // Mailer Envelope configuration
+ *             sender?: scalar|Param|null,
+ *             recipients?: list<scalar|Param|null>,
+ *             allowed_recipients?: list<scalar|Param|null>,
+ *         },
+ *         headers?: array<string, string|array{ // Default: []
+ *             value?: mixed,
+ *         }>,
+ *         dkim_signer?: bool|array{ // DKIM signer configuration
+ *             enabled?: bool|Param, // Default: false
+ *             key?: scalar|Param|null, // Key content, or path to key (in PEM format with the `file://` prefix) // Default: ""
+ *             domain?: scalar|Param|null, // Default: ""
+ *             select?: scalar|Param|null, // Default: ""
+ *             passphrase?: scalar|Param|null, // The private key passphrase // Default: ""
+ *             options?: array<string, mixed>,
+ *         },
+ *         smime_signer?: bool|array{ // S/MIME signer configuration
+ *             enabled?: bool|Param, // Default: false
+ *             key?: scalar|Param|null, // Path to key (in PEM format) // Default: ""
+ *             certificate?: scalar|Param|null, // Path to certificate (in PEM format without the `file://` prefix) // Default: ""
+ *             passphrase?: scalar|Param|null, // The private key passphrase // Default: null
+ *             extra_certificates?: scalar|Param|null, // Default: null
+ *             sign_options?: int|Param, // Default: null
+ *         },
+ *         smime_encrypter?: bool|array{ // S/MIME encrypter configuration
+ *             enabled?: bool|Param, // Default: false
+ *             repository?: scalar|Param|null, // S/MIME certificate repository service. This service shall implement the `Symfony\Component\Mailer\EventListener\SmimeCertificateRepositoryInterface`. // Default: ""
+ *             cipher?: int|Param, // A set of algorithms used to encrypt the message // Default: null
+ *         },
+ *     },
+ *     secrets?: bool|array{
+ *         enabled?: bool|Param, // Default: true
+ *         vault_directory?: scalar|Param|null, // Default: "%kernel.project_dir%/config/secrets/%kernel.runtime_environment%"
+ *         local_dotenv_file?: scalar|Param|null, // Default: "%kernel.project_dir%/.env.%kernel.environment%.local"
+ *         decryption_env_var?: scalar|Param|null, // Default: "base64:default::SYMFONY_DECRYPTION_SECRET"
+ *     },
+ *     notifier?: bool|array{ // Notifier configuration
+ *         enabled?: bool|Param, // Default: false
+ *         message_bus?: scalar|Param|null, // The message bus to use. Defaults to the default bus if the Messenger component is installed. // Default: null
+ *         chatter_transports?: array<string, scalar|Param|null>,
+ *         texter_transports?: array<string, scalar|Param|null>,
+ *         notification_on_failed_messages?: bool|Param, // Default: false
+ *         channel_policy?: array<string, string|list<scalar|Param|null>>,
+ *         admin_recipients?: list<array{ // Default: []
+ *             email?: scalar|Param|null,
+ *             phone?: scalar|Param|null, // Default: ""
+ *         }>,
+ *     },
+ *     rate_limiter?: bool|array{ // Rate limiter configuration
+ *         enabled?: bool|Param, // Default: true
+ *         limiters?: array<string, array{ // Default: []
+ *             lock_factory?: scalar|Param|null, // The service ID of the lock factory used by this limiter (or null to disable locking). // Default: "auto"
+ *             cache_pool?: scalar|Param|null, // The cache pool to use for storing the current limiter state. // Default: "cache.rate_limiter"
+ *             storage_service?: scalar|Param|null, // The service ID of a custom storage implementation, this precedes any configured "cache_pool". // Default: null
+ *             policy?: "fixed_window"|"token_bucket"|"sliding_window"|"compound"|"no_limit"|Param, // The algorithm to be used by this limiter.
+ *             limiters?: list<scalar|Param|null>,
+ *             limit?: int|Param, // The maximum allowed hits in a fixed interval or burst.
+ *             interval?: scalar|Param|null, // Configures the fixed interval if "policy" is set to "fixed_window" or "sliding_window". The value must be a number followed by "second", "minute", "hour", "day", "week" or "month" (or their plural equivalent).
+ *             rate?: array{ // Configures the fill rate if "policy" is set to "token_bucket".
+ *                 interval?: scalar|Param|null, // Configures the rate interval. The value must be a number followed by "second", "minute", "hour", "day", "week" or "month" (or their plural equivalent).
+ *                 amount?: int|Param, // Amount of tokens to add each interval. // Default: 1
+ *             },
+ *         }>,
+ *     },
+ *     uid?: bool|array{ // Uid configuration
+ *         enabled?: bool|Param, // Default: true
+ *         default_uuid_version?: 7|6|4|1|Param, // Default: 7
+ *         name_based_uuid_version?: 5|3|Param, // Default: 5
+ *         name_based_uuid_namespace?: scalar|Param|null,
+ *         time_based_uuid_version?: 7|6|1|Param, // Default: 7
+ *         time_based_uuid_node?: scalar|Param|null,
+ *     },
+ *     html_sanitizer?: bool|array{ // HtmlSanitizer configuration
+ *         enabled?: bool|Param, // Default: false
+ *         sanitizers?: array<string, array{ // Default: []
+ *             allow_safe_elements?: bool|Param, // Allows "safe" elements and attributes. // Default: false
+ *             allow_static_elements?: bool|Param, // Allows all static elements and attributes from the W3C Sanitizer API standard. // Default: false
+ *             allow_elements?: array<string, mixed>,
+ *             block_elements?: list<string|Param>,
+ *             drop_elements?: list<string|Param>,
+ *             allow_attributes?: array<string, mixed>,
+ *             drop_attributes?: array<string, mixed>,
+ *             force_attributes?: array<string, array<string, string|Param>>,
+ *             force_https_urls?: bool|Param, // Transforms URLs using the HTTP scheme to use the HTTPS scheme instead. // Default: false
+ *             allowed_link_schemes?: list<string|Param>,
+ *             allowed_link_hosts?: list<string|Param>|null,
+ *             allow_relative_links?: bool|Param, // Allows relative URLs to be used in links href attributes. // Default: false
+ *             allowed_media_schemes?: list<string|Param>,
+ *             allowed_media_hosts?: list<string|Param>|null,
+ *             allow_relative_medias?: bool|Param, // Allows relative URLs to be used in media source attributes (img, audio, video, ...). // Default: false
+ *             with_attribute_sanitizers?: list<string|Param>,
+ *             without_attribute_sanitizers?: list<string|Param>,
+ *             max_input_length?: int|Param, // The maximum length allowed for the sanitized input. // Default: 0
+ *         }>,
+ *     },
+ *     webhook?: bool|array{ // Webhook configuration
+ *         enabled?: bool|Param, // Default: false
+ *         message_bus?: scalar|Param|null, // The message bus to use. // Default: "messenger.default_bus"
+ *         routing?: array<string, array{ // Default: []
+ *             service?: scalar|Param|null,
+ *             secret?: scalar|Param|null, // Default: ""
+ *         }>,
+ *     },
+ *     remote-event?: bool|array{ // RemoteEvent configuration
+ *         enabled?: bool|Param, // Default: false
+ *     },
+ *     json_streamer?: bool|array{ // JSON streamer configuration
+ *         enabled?: bool|Param, // Default: false
+ *     },
+ * }
+ * @psalm-type TwigConfig = array{
+ *     form_themes?: list<scalar|Param|null>,
+ *     globals?: array<string, array{ // Default: []
+ *         id?: scalar|Param|null,
+ *         type?: scalar|Param|null,
+ *         value?: mixed,
+ *     }>,
+ *     autoescape_service?: scalar|Param|null, // Default: null
+ *     autoescape_service_method?: scalar|Param|null, // Default: null
+ *     base_template_class?: scalar|Param|null, // Deprecated: The child node "base_template_class" at path "twig.base_template_class" is deprecated.
+ *     cache?: scalar|Param|null, // Default: true
+ *     charset?: scalar|Param|null, // Default: "%kernel.charset%"
+ *     debug?: bool|Param, // Default: "%kernel.debug%"
+ *     strict_variables?: bool|Param, // Default: "%kernel.debug%"
+ *     auto_reload?: scalar|Param|null,
+ *     optimizations?: int|Param,
+ *     default_path?: scalar|Param|null, // The default path used to load templates. // Default: "%kernel.project_dir%/templates"
+ *     file_name_pattern?: list<scalar|Param|null>,
+ *     paths?: array<string, mixed>,
+ *     date?: array{ // The default format options used by the date filter.
+ *         format?: scalar|Param|null, // Default: "F j, Y H:i"
+ *         interval_format?: scalar|Param|null, // Default: "%d days"
+ *         timezone?: scalar|Param|null, // The timezone used when formatting dates, when set to null, the timezone returned by date_default_timezone_get() is used. // Default: null
+ *     },
+ *     number_format?: array{ // The default format options for the number_format filter.
+ *         decimals?: int|Param, // Default: 0
+ *         decimal_point?: scalar|Param|null, // Default: "."
+ *         thousands_separator?: scalar|Param|null, // Default: ","
+ *     },
+ *     mailer?: array{
+ *         html_to_text_converter?: scalar|Param|null, // A service implementing the "Symfony\Component\Mime\HtmlToTextConverter\HtmlToTextConverterInterface". // Default: null
+ *     },
+ * }
+ * @psalm-type ConfigType = array{
+ *     imports?: ImportsConfig,
+ *     parameters?: ParametersConfig,
+ *     services?: ServicesConfig,
+ *     framework?: FrameworkConfig,
+ *     twig?: TwigConfig,
+ *     "when@dev"?: array{
+ *         imports?: ImportsConfig,
+ *         parameters?: ParametersConfig,
+ *         services?: ServicesConfig,
+ *         framework?: FrameworkConfig,
+ *         twig?: TwigConfig,
+ *     },
+ *     "when@prod"?: array{
+ *         imports?: ImportsConfig,
+ *         parameters?: ParametersConfig,
+ *         services?: ServicesConfig,
+ *         framework?: FrameworkConfig,
+ *         twig?: TwigConfig,
+ *     },
+ *     ...<string, ExtensionType|array{ // extra keys must follow the when@%env% pattern or match an extension alias
+ *         imports?: ImportsConfig,
+ *         parameters?: ParametersConfig,
+ *         services?: ServicesConfig,
+ *         ...<string, ExtensionType>,
+ *     }>
+ * }
+ */
+final class App
+{
+    /**
+     * @param ConfigType $config
+     *
+     * @psalm-return ConfigType
+     */
+    public static function config(array $config): array
+    {
+        /** @var ConfigType $config */
+        $config = AppReference::config($config);
+
+        return $config;
+    }
+}
+
+namespace Symfony\Component\Routing\Loader\Configurator;
+
+/**
+ * This class provides array-shapes for configuring the routes of an application.
+ *
+ * Example:
+ *
+ *     ```php
+ *     // config/routes.php
+ *     namespace Symfony\Component\Routing\Loader\Configurator;
+ *
+ *     return Routes::config([
+ *         'controllers' => [
+ *             'resource' => 'routing.controllers',
+ *         ],
+ *     ]);
+ *     ```
+ *
+ * @psalm-type RouteConfig = array{
+ *     path: string|array<string,string>,
+ *     controller?: string,
+ *     methods?: string|list<string>,
+ *     requirements?: array<string,string>,
+ *     defaults?: array<string,mixed>,
+ *     options?: array<string,mixed>,
+ *     host?: string|array<string,string>,
+ *     schemes?: string|list<string>,
+ *     condition?: string,
+ *     locale?: string,
+ *     format?: string,
+ *     utf8?: bool,
+ *     stateless?: bool,
+ * }
+ * @psalm-type ImportConfig = array{
+ *     resource: string,
+ *     type?: string,
+ *     exclude?: string|list<string>,
+ *     prefix?: string|array<string,string>,
+ *     name_prefix?: string,
+ *     trailing_slash_on_root?: bool,
+ *     controller?: string,
+ *     methods?: string|list<string>,
+ *     requirements?: array<string,string>,
+ *     defaults?: array<string,mixed>,
+ *     options?: array<string,mixed>,
+ *     host?: string|array<string,string>,
+ *     schemes?: string|list<string>,
+ *     condition?: string,
+ *     locale?: string,
+ *     format?: string,
+ *     utf8?: bool,
+ *     stateless?: bool,
+ * }
+ * @psalm-type AliasConfig = array{
+ *     alias: string,
+ *     deprecated?: array{package:string, version:string, message?:string},
+ * }
+ * @psalm-type RoutesConfig = array{
+ *     "when@dev"?: array<string, RouteConfig|ImportConfig|AliasConfig>,
+ *     "when@prod"?: array<string, RouteConfig|ImportConfig|AliasConfig>,
+ *     ...<string, RouteConfig|ImportConfig|AliasConfig>
+ * }
+ */
+final class Routes
+{
+    /**
+     * @param RoutesConfig $config
+     *
+     * @psalm-return RoutesConfig
+     */
+    public static function config(array $config): array
+    {
+        return $config;
+    }
+}

config/services.yaml

@@ -0,0 +1,82 @@
+# yaml-language-server: $schema=../vendor/symfony/dependency-injection/Loader/schema/services.schema.json
+
+# This file is the entry point to configure your own services.
+# Files in the packages/ subdirectory configure your dependencies.
+# See also https://symfony.com/doc/current/service_container/import.html
+
+# Put parameters here that don't need to change on each machine where the app is deployed
+# https://symfony.com/doc/current/best_practices.html
+#   #use-parameters-for-application-configuration
+parameters:
+    # --- main options ---
+    # URI containing secret and config for TOTP, which determines the token to login
+    # app will generate one, if not provided, but you should copy it to your .env file
+    # format: "otpauth://totp/<label>?secret=<secret-key>"
+    env(TOTP_URI): ''               # blank to have the app generate one at random
+    # how long will someone stay logged in, measured in seconds, zero for DEFAULT
+    env(COOKIE_TTL): '2592000'      # default 30 days
+    # Enable optional redirection to a dedicated authentication subdomain
+    env(SUBDOMAIN_REDIRECT): '0' # boolean, 1 to enable
+    # The subdomain (e.g., auth.example.com) to which unauthenticated users are redirected
+    env(AUTH_SUBDOMAIN): ''
+
+    # --- extra options ---
+    # how long do we allow all traffic from an ip address after successful login
+    # could be useful if you have a system which does not handle cookies
+    env(IP_TTL): '0'                # default disabled, time in seconds
+    # once blocked, do we respond with "I'm a teapot", false to use "Too many requests"
+    env(TEAPOT): '1' # boolean
+
+    # --- rate limiting ---
+    # Note: rate limiting can *NOT* be disabled, but you could allow hundreds of logins a second
+    # rate limiting, default is the lower of 2 per 30 seconds or 10 per hour
+    env(BURST_COUNT): 2             # 2 per 30 seconds
+    env(BURST_TIME): 30             # seconds
+    env(UPPER_COUNT): 10            # 10 per hour
+    env(UPPER_TIME): 3600           # seconds (1 hour)
+
+    # --- styling options ---
+    env(TITLE): 'Pre-Authentication System'
+    env(BG_COLOR): '#029386'        # teal
+    env(FG_COLOR): '#ffffff'        # white
+    env(ERROR_COLOR): '#ffb16d'     # apricot (light orange)
+    env(ID_NAME): 'Session ID'
+    env(TOKEN_NAME): 'Authentication Token'
+    env(SUBMIT_NAME): 'Submit'
+    env(ERROR_MESSAGE): 'Unsuccessful login attempt'
+    # title and message to use on block page, if teapot is true
+    env(TEAPOT_TITLE): "I'm a teapot"
+    env(TEAPOT_MESSAGE): 'I refuse to brew coffee'
+    # title and message to use on block page, if teapot is false
+    env(TOO_MANY_TITLE): 'Too many requests'
+    env(TOO_MANY_MESSAGE): 'Try again later'
+
+    # --- debug options ---
+    env(SHELL_VERBOSITY): '0'       # set to 3 to log debug
+
+    # --- application variables ---
+    app.totp_uri: '%env(TOTP_URI)%'
+    app.cookie_ttl: '%env(COOKIE_TTL)%'
+    app.subdomain_redirect: '%env(SUBDOMAIN_REDIRECT)%'
+    app.auth_subdomain: '%env(AUTH_SUBDOMAIN)%'
+
+    app.ip_ttl: '%env(IP_TTL)%'
+    app.teapot: '%env(TEAPOT)%'
+
+    app.error_message: '%env(ERROR_MESSAGE)%'
+    app.teapot_title: '%env(TEAPOT_TITLE)%'
+    app.too_many_title: '%env(TOO_MANY_TITLE)%'
+
+services:
+    # default configuration for services in *this* file
+    _defaults:
+        autowire: true      # Automatically injects dependencies in your services.
+        autoconfigure: true # Automatically registers your services.
+
+    # makes classes in src/ available to be used as services
+    # this creates a service per class whose id is the fully-qualified class name
+    App\:
+        resource: '../src/'
+
+    # add more service definitions when explicit configuration is needed
+    # please note that last definitions always *replace* previous ones

docs/Caddyfile

@@ -0,0 +1,28 @@
+# example of securing full service
+# TODO replace domain and service name and port
+service.example.com {
+	forward_auth preauth {
+		uri {uri}
+		copy_headers Remote-User
+	}
+	reverse_proxy service-container:80
+}
+
+# you can choose to only restrict select paths
+# or any other Caddy match criteria, if desired
+# IE: https://protected.example.com/secure/
+protected.example.com {
+	# note any request that does not start with "/secure/" is NOT protected
+	forward_auth /secure/* preauth {
+		uri {uri}
+		copy_headers Remote-User
+	}
+	reverse_proxy protected-service:9000
+}
+
+# optionally, if you want to use a subdomain for centeral preauth
+# set SUBDOMAIN_REDIRECT to true
+# and AUTH_SUBDOMAIN to match the subdomain you use here
+auth.example.com {
+	reverse_proxy preauth
+}

docs/compose.yaml

@@ -0,0 +1,22 @@
+services:
+  preauth:
+    env_file:
+      # TODO rename "example.env" to ".env", edit as needed
+      # strongly recommend setting TOTP_URI, if not provided the app
+      # will generate one for you, please copy it into your .env file
+      - .env
+    expose:
+      - 80
+    image: digitaladapt/preauth:latest
+    restart: unless-stopped
+    # if you wish to set the user, you must make sure that the user
+    # can write to /config and /data within the container
+    #user: <uid>:<gid>
+    volumes:
+      - preauth-config:/config
+      - preauth-data:/data
+
+volumes:
+  preauth-config:
+  preauth-data:
+

docs/example.env

@@ -0,0 +1,55 @@
+# --- main options ---
+
+# URI containing secret and config for TOTP, which determines the token to login
+# app will generate one, if not provided, but you should copy it to your .env file
+# format: "otpauth://totp/<label>?secret=<secret-key>"
+#TOTP_URI=''                # blank to have the app generate one at random
+
+# how long will someone stay logged in, measured in seconds, zero for DEFAULT
+#COOKIE_TTL=2592000         # default 30 days
+
+# we can use a central auth, so that users only need to login once to have access to
+# multiple services. Requires using sub-domains under the same domain.
+# IE: if enabled have "service-one.example.com" redirect "auth.example.com", and after
+# successful auth, user can visit "service-two.example.com" without having to login again.
+#SUBDOMAIN_REDIRECT=false   # default disabled, boolean
+#AUTH_SUBDOMAIN=''          # blank, hostname we send user to, to see login page
+
+# --- extra options ---
+
+# how long do we allow *ALL* traffic from an ip address after successful login
+# could be useful if you have a system which does not handle cookies
+#IP_TTL=0                   # default disabled, time in seconds
+
+# once blocked, do we respond with "I'm a teapot", false to use "Too many requests"
+#TEAPOT=true                # default enabled, boolean
+
+# --- rate limiting ---
+
+# Note: rate limiting can *NOT* be disabled, but you could allow hundreds of logins a second
+# rate limiting, default is the lower of 2 per 30 seconds or 10 per hour
+#BURST_COUNT=2              # 2 per 30 seconds
+#BURST_TIME=30              # seconds
+#UPPER_COUNT=10             # 10 per hour
+#UPPER_TIME=3600            # seconds (1 hour)
+
+# --- styling options ---
+
+#TITLE='Pre-Authentication System'
+#BG_COLOR='#029386'         # teal
+#FG_COLOR='#ffffff'         # white
+#ERROR_COLOR='#ffb16d'      # apricot (light orange)
+#ID_NAME='Session ID'
+#TOKEN_NAME='Authentication Token'
+#SUBMIT_NAME='Submit'
+#ERROR_MESSAGE='Unsuccessful login attempt'
+# title and message to use on block page, if teapot is true
+#TEAPOT_TITLE="I'm a teapot"
+#TEAPOT_MESSAGE='I refuse to brew coffee'
+# title and message to use on block page, if teapot is false
+#TOO_MANY_TITLE='Too many requests'
+#TOO_MANY_MESSAGE='Try again later'
+
+# --- debug options ---
+#SHELL_VERBOSITY=0          # set to "3" to log debug
+

health.php

@@ -1,13 +0,0 @@
-<?php
-/* do garbage collection on rate limit monitoring sessions */
-session_start();
-$success = session_gc();
-session_destroy();
-
-if ($success !== false) {
-    /* if garbage collection was successful, report that we are healthy */
-    echo implode('', ['o', 'n', 'l', 'i', 'n', 'e', "\n"]);
-} else {
-    echo "error\n";
-}
-

init-key.php

@@ -1,13 +0,0 @@
-<?php
-declare(strict_types=1);
-
-$key = getenv('PREAUTH_KEY');
-
-// generate a new key, if not specified
-if ( ! $key) {
-    $key = base64_encode(random_bytes(64));
-    error_log("ERROR: PREAUTH_KEY is not set, generating a random session encryption key:\n'$key'\nupdate your config or it will be regenerated when you restart.");
-}
-
-echo $key;
-

init-token.php

@@ -1,17 +0,0 @@
-<?php
-declare(strict_types=1);
-
-require __DIR__ . '/vendor/autoload.php';
-
-use OTPHP\TOTP;
-
-$token = getenv('PREAUTH_TOKEN');
-
-// generate a new token, if not specified
-if ( ! $token) {
-    $token = TOTP::generate()->getSecret();
-    error_log("ERROR: PREAUTH_TOKEN is not set, generating random TOTP token:\n'$token'\nupdate your config or it will be regenerated when you restart.");
-}
-
-echo $token;
-

init.sh

@@ -1,18 +0,0 @@
-#!/bin/sh
-
-# ensure we have required folders
-`mkdir -p /tmp/data/sessions`
-`mkdir -p /tmp/data/monitor`
-
-# ensure we have required settings
-if [ -z "$PREAUTH_KEY" ]; then
-    export PREAUTH_KEY=$(cd /preauth && php init-key.php)
-fi
-
-if [ -z "$PREAUTH_TOKEN" ]; then
-    export PREAUTH_TOKEN=$(cd /preauth && php init-token.php)
-fi
-
-# start the process, now that setup is done
-exec php-fpm
-

phpunit.dist.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- https://phpunit.readthedocs.io/en/latest/configuration.html -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         colors="true"
+         failOnDeprecation="true"
+         failOnNotice="true"
+         failOnWarning="true"
+         bootstrap="tests/bootstrap.php"
+         cacheDirectory=".phpunit.cache"
+>
+    <php>
+        <ini name="display_errors" value="1" />
+        <ini name="error_reporting" value="-1" />
+        <server name="APP_ENV" value="test" force="true" />
+        <server name="SHELL_VERBOSITY" value="-1" />
+        <server name="KERNEL_CLASS" value="App\Tests\TestKernel" />
+        <!-- fixed TOTP secret so functional tests can compute valid codes -->
+        <server name="TOTP_URI" value="otpauth://totp/Test-TOTP?secret=JBSWY3DPEHPK3PXP" />
+        <server name="APP_SECRET" value="test_secret_key_change_me" />
+        <!-- high rate limits so functional tests don't get blocked -->
+        <server name="BURST_COUNT" value="10000" />
+        <server name="UPPER_COUNT" value="10000" />
+    </php>
+
+    <testsuites>
+        <testsuite name="Project Test Suite">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <source ignoreSuppressionOfDeprecations="true"
+            ignoreIndirectDeprecations="true"
+            restrictNotices="true"
+            restrictWarnings="true"
+    >
+        <include>
+            <directory>src</directory>
+        </include>
+
+        <deprecationTrigger>
+            <function>trigger_deprecation</function>
+        </deprecationTrigger>
+    </source>
+
+    <extensions>
+    </extensions>
+</phpunit>

preauth-php.ini

@@ -1,21 +0,0 @@
-; preauth uses php sessions to store usage statistics by IP address and is used for rate limiting
-; login sessions are stored as file in /tmp/data/sessions, and are unrelated to this configuration
-
-; sessions are IP based, cookie not needed nor wanted
-session.use_cookies = off
-; deprecated in php 8.4
-;session.use_only_cookies = off
-session.cache_limiter = ''
-session.name = preauth
-session.save_path = /tmp/data/monitor
-
-; seconds until a session may be pruned
-; IE: maximum time range to review for rate limiting and
-; maximum time an IP address can be blocked
-; 86400 seconds aka 24 hours hardcoded upper limit
-session.gc_maxlifetime = 86400
-
-; disable random random garbage collection
-; our healthcheck runs session_gc function
-session.gc_probability = 0
-

preauth.php

@@ -1,15 +0,0 @@
-<?php
-declare(strict_types=1);
-
-require __DIR__ . '/vendor/autoload.php';
-
-use Preauth\Auth;
-
-/* kickoff the script */
-$auth = new Auth($_SERVER['HTTP_HOST'] ?? 'example.com');
-$auth->run();
-
-/* no additional output most of the time, sometimes we'll continue to display the login screen */
-if ($auth->showTemplate()) {
-    include __DIR__ . '/template.php';
-}

public/index.php

@@ -0,0 +1,10 @@
+<?php
+declare(strict_types=1);
+
+use App\Kernel;
+
+require_once dirname(__DIR__).'/vendor/autoload_runtime.php';
+
+return function (array $context) {
+    return new Kernel($context['APP_ENV'], (bool) $context['APP_DEBUG']);
+};

readme.md

@@ -1,27 +1,68 @@
 # Preauth
-Pre-authorization, because sometimes you need both a belt and suspenders.
+For when you want to expose a web service without letting the whole world try to access it. Because sometimes you want both a belt and suspenders.
 
-The goal of this is to make it as simple as possible to put a web service behind an extra layer of authentication.
+I found myself needing to make my personal Nextcloud instance available outside my VPN, but was worried since it has had authentication exploits in the past. 
 
-Maybe you need the extra protection because it's a very sensitive system, or because it's a legacy system with known security issues.
+So, I built a simple authentication gateway, which eventually turned into this project.
+
+It sits between your reverse proxy and web service to add extra protection, while still being easy to access from anywhere.
 
 ## Requirements
 
 * Docker
 * Caddy (as a reverse proxy)
-* a domain
 * a web service you want to secure
 
 It may be possible to use some other reverse proxy, but for now, I'm going to stick with just Caddy.
 
-There is an example Caddyfile and example .env file to get you started. Within the Caddyfile is a snippet, which makes it easy to wrap your web service with preauth.
+There is an example Caddyfile in /docs/ and env.example file to get you started. Within the Caddyfile is a snippet, which makes it easy to wrap your web service with preauth.
 
-Preauth will need a subdomain on the same domain as the service it's securing, the default is "preauth", but you can use whatever you want.
+When someone tries to reach your protected web service, Caddy will check with preauth if they are allowed, if their preauth cookie is missing, invalid, or expired, we will show them to a login screen.
 
-When someone tries to reach your protected web service, Caddy will check with preauth if they are allowed, if their preauth cookie is missing, invalid, or expired, we will redirect them to a login screen.
+I say login, but it's really just a TOTP code (6-digit code which changes every 30 second). But once they enter the right code,they'll get their cookie and be shown the protected service. It is also possible to allow all requests from an approved IP address, but that is disabled by default.
 
-I say login, but it's really just a TOTP code (6 digit code which changes every 30 second). But once they enter the right code,they'll get their cookie and be redirected to the protected service.
+First time you spin up the docker container it will generate a TOTP secret (which you'll load into your authenticator app); or generate you own.
 
-First time you spin up the docker container it will generate an encryption key for session storage, and the TOTP secret (which you'll load into your authenticator app).
+Be sure to save that TOTP secret to your docker environment, so that it persists beyond removing the container.
 
-Be sure to save those and add them to the containers environment, or it will generate new values every time it restarts.
+## Backup Codes
+
+It is possible to generate single-use backup codes via a console command within the docker container.
+
+```shell
+docker exec -t preauth bin/console app:generate-backup-codes [count=10]
+```
+
+### History
+#### v0.7.0 (May 29th, 2026)
+Added ability to generate single-use backup codes.
+Removed static password and lookup token, as they were security risks.
+Updated to PHP 8.5, updated dependencies.
+
+#### v0.6.0 (Feb 10th, 2026)
+Added optional (disabled by default) ability to lookup token by static password.
+
+#### v0.5.0 (Jan 17th, 2026)
+Nonce related cleanup; added optional (disabled by default) ability to use a static password as a backup means of authentication.
+
+#### v0.4.1 (Dec 26th, 2025)
+Fixed bug which can occur if you delete cache files.
+
+#### v0.4.0 (Dec 26th, 2025)
+Massive rewrite to switch to using listeners instead of controller, header for login payload instead of get request, removed icon system, asset system, was able to remove all the domain processing, enhanced cookie security, and more.
+
+#### v0.3.0 (Dec 15th, 2025)
+Includes significant breaking changes.
+Default port and transportation changed to http via port 80.
+Names of environment variables have changed.
+
+#### v0.2.0 (Dec 3rd, 2025)
+Now with login rate limiting.
+New page for client error (too many requests).
+Made example docker compose.
+
+#### v0.1.0 (Nov 14th, 2025)
+Now an actual project, docker image pushed to docker hub, which uses php-fpm, code into a src folder, templates into separate files.
+
+#### v0.0.1 (June 26th, 2024)
+Started off as a single file script which was part of my caddy config. Hardcoded TOTP secret, zero flexibility, but functional. Would stay like that, quietly working in production for about a full year before any real change.

src/Auth.php

@@ -1,356 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace Preauth;
-
-use OTPHP\TOTP;
-use Symfony\Component\HttpFoundation\IpUtils;
-use Symfony\Component\Uid\Uuid;
-
-class Auth {
-    /* name of the return-to field */
-    public const RETURN_FIELD = 'preauth_rt';
-    /* name of the id field */
-    public const ID_FIELD = 'preauth_id';
-    /* name of the token field */
-    public const TOKEN_FIELD = 'preauth_token';
-    /* the encryption cipher we are using */
-    private const CIPHER = 'camellia-256-ctr';
-    /* only allow A-z 0-9 _ - */
-    private const URL64 = '/[^A-Za-z0-9_-]+/';
-    /* cookie name */
-    private const NAME = '_auth_uuid';
-    /* directory to store sessions in */
-    private const BASE = '/tmp/data/sessions/';
-    /* top-level-domains which are known to have multiple parts */
-    private const TLD = [
-        'ai'  => ['com','net','off','org'],
-        'am'  => ['radio'],
-        'com' => ['br','cn','co','de','eu','gr','it','jpn','mex','ru','sa','uk','us','za'],
-        'de'  => ['com'],
-        'fm'  => ['radio'],
-        'gg'  => ['co','net','org'],
-        'in'  => ['co','firm','gen','ind','net','org'],
-        'je'  => ['co','net','org'],
-        'mx'  => ['com','net','org'],
-        'net' => ['gb','hu','in','jp','se','uk'],
-        'nz'  => ['co','net','org'],
-        'org' => ['ae','us'],
-        'ph'  => ['com','net','org'],
-        'se'  => ['com'],
-        'uk'  => ['co','me','org'],
-    ];
-
-    /** @var string $preauth subdomain (without domain) the login page will use */
-    private string $preauth;
-    /** @var string $domain domain (without subdomains) we are controlling auth for */
-    private string $domain;
-    /** @var int $expire time-to-live of auth cookie */
-    private int $expire;
-    /** @var array $get like $_GET, but based on data given by reverse proxy */
-    private array $get = [];
-    /** @var string $key secret for encryption to store sessions */
-    private string $key;
-    /** @var string $token secret for 2FA token */
-    private string $token;
-    /** @var bool $stop set to false to print login page */
-    private bool $stop = true;
-    /** @var string $id user provided name for their session */
-    private string $id;
-
-    /**
-     * @param string $host domain which auth is relative to
-     */
-    public function __construct(string $host) {
-        $this->preauth = getenv('PREAUTH_SUBDOMAIN') ?: 'preauth';
-        $this->domain = $this->baseDomain($host);
-        $this->key = base64_decode(getenv('PREAUTH_KEY') ?: '');
-        $this->token = getenv('PREAUTH_TOKEN') ?: '';
-        $this->expire = time() + 60 * ((int)getenv('PREAUTH_TTL') ?: 43200);
-        parse_str((parse_url((
-            $_SERVER['HTTP_X_FORWARDED_URI'] ?? ''
-        ), PHP_URL_QUERY) ?: ''), $this->get);
-    }
-
-    /**
-     * @return boolean returns true if we should display login page, false if we are done
-     */
-    public function showTemplate(): bool {
-        return ( ! $this->stop);
-    }
-
-    /**
-     * @return string returns the return-to-url, if one was specified, empty string otherwise
-     */
-    public function getReturnTo(): string {
-        $rt = $this->get[self::RETURN_FIELD] ?? '';
-        if ( ! is_string($rt)) {
-            $rt = '';
-        }
-        return $rt;
-    }
-
-    /**
-     * @return string returns our current domain with all subdomains removed
-     */
-    public function getBaseDomain(): string {
-        return $this->domain;
-    }
-
-    /**
-     * Entry point of code, review request and determine course of action
-     */
-    public function run(): void {
-        if ( ! $this->key || ! $this->token) {
-            $this->die();
-        }
-
-        /* already logged in with valid session, return 200, so caddy permits request */
-        $uuid = $this->getExistingUUID();
-        if ($uuid) {
-            echo "ok $this->id";
-            return;
-        }
-
-        /* if too many requests (from the remote-ip), then trigger rate limiting */
-        if ($this->rateLimit()) {
-            include __DIR__ . '/../400.php';
-            exit(0);
-        }
-
-        /* if request is valid login attempt, (set cookie and) return to where they came from */
-        if ($this->login()) {
-            if ($this->getReturnTo()) {
-                header("Location: {$this->getReturnTo()}");
-            } else if (getenv('PREAUTH_SEND_TO')) {
-                header("Location: " . getenv('PREAUTH_SEND_TO'));
-            }
-            echo "ok $this->id";
-            return;
-        }
-
-        /* not already logged in, but on auth page, so present login screen */
-        /* either not trying to login or had a failed login attempt */
-        if ($_SERVER['HTTP_HOST'] === "$this->preauth.$this->domain") {
-            header('http/1.1 401 Unauthorized', true, 401);
-            $this->stop = false;
-        } else {
-            /* not already logged in, not trying to login, and not on auth page */
-            /* so send to login screen */
-            $query = self::RETURN_FIELD . '=' . rawurlencode(
-                ($_SERVER['HTTP_X_FORWARDED_PROTO'] ?? 'https') . '://' .
-                ($_SERVER['HTTP_X_FORWARDED_HOST'] ?? $this->domain) .
-                ($_SERVER['HTTP_X_FORWARDED_URI'] ?? '/')
-            );
-            header("Location: https://$this->preauth.$this->domain/?$query");
-        }
-    }
-
-    /**
-     * This lets us determine the base domain:
-     * "service.example.co.uk" into "example.co.uk" and "service.example.com" into "example.com"
-     * @param string $host domain with zero or more subdomains
-     * @return string returns same domain with all subdomains removed
-     */
-    private function baseDomain(string $host): string {
-        $parts = array_reverse(explode('.', $host));
-        $keep = min(2, count($parts));
-        /* check if host should retain 3 parts, due to TLD */
-        if (count($parts) > 2 && isset(self::TLD[$parts[0]]) &&
-            in_array($parts[1], self::TLD[$parts[0]], true)
-        ) {
-            $keep = 3;
-        }
-        $parts = array_reverse(array_slice($parts, 0, $keep));
-        return implode('.', $parts);
-    }
-
-    /**
-     * Stop, critical server config issue
-     */
-    private function die(): string {
-        error_log('PREAUTH_KEY and/or PREAUTH_TOKEN are not set, unable to continue.');
-        header('http/1.1 500 Internal Server Error', true, 500);
-        include __DIR__ . '/../500.php';
-        exit(0);
-    }
-
-    /**
-     * @return string|null returns the existing UUID if there is valid one, null otherwise
-     */
-    private function getExistingUUID(): ?string {
-        /* filter user input */
-        $encUUID = preg_replace(self::URL64, '', ($_COOKIE[self::NAME] ?? ''));
-
-        /* session exists as a file where the filename is the encoded-uuid */
-        /* in the format '<iv-b64>$<session-name>$<expiration>$<date>$<remote-host>' */
-        if ($encUUID && is_file(self::BASE . $encUUID)) {
-            [$iv, $id, $expire] = explode('$', (file_get_contents(
-                self::BASE . $encUUID
-            ) ?: '') . '$$');
-            if ($iv) {
-                /* raw-uuid means not encoded, but still encrypted */
-                $rawUUID = base64_decode(strtr($encUUID, '+/', '-_'));
-                $rawIV = base64_decode($iv);
-                $uuid = openssl_decrypt($rawUUID, self::CIPHER, $this->key, 0, $rawIV);
-                if (Uuid::isValid($uuid) && (int)$expire >= time()) {
-                    $this->id = substr(preg_replace(self::URL64, '', $id), 0, 100);
-                    return $uuid;
-                }
-                /* we have something encrypted, but it is expired or invalid, so delete it */
-                unlink(self::BASE . $encUUID);
-            }
-        }
-        return null;
-    }
-
-    /**
-     * Check if the remote-host has made too many login requests recently, and block if needed
-     * @return bool returns true if we should rate-limit this request, false otherwise
-     */
-    private function rateLimit(): bool {
-        /* our identifier for this remote-host, replace all special characters with dashes */
-        /* session_id() only allows ",", "-", and alphanumeric characters */
-        $limiterId = preg_replace('/[^a-zA-Z0-9]/', '-', $this->getRemoteHost());
-        //error_log("limiterId: {$limiterId}");
-        session_id($limiterId);
-        session_start();
-
-        /* new remote-ip, start logging */
-        if ( ! isset($_SESSION['count'], $_SESSION['time'])) {
-            $this->resetRateLimit(false);
-            //error_log('limiter new, allow');
-            return false;
-        }
-
-        $sessionCount = (int)$_SESSION['count'];
-        $sessionTime  = (int)$_SESSION['time'];
-        $rateLimit    = (int)getenv('PREAUTH_RATE_LIMIT')   ?: 4;
-        $rateTimeout  = (int)getenv('PREAUTH_RATE_TIMEOUT') ?: 360;
-        $rateBlocked  = (int)getenv('PREAUTH_RATE_BLOCKED') ?: 1440;
-        $rateMaximum  = max($rateTimeout, $rateBlocked);
-
-        if ($sessionCount >= $rateLimit && time() - $rateBlocked <= $sessionTime) {
-            /* if over limit, and block current, block them */
-            //error_log("limiter over limit, block ($sessionCount)");
-            return true;
-        } else if ($sessionCount < $rateLimit && time() - $rateTimeout <= $sessionTime) {
-            /* if under limit, and timeout current, allow them */
-            //error_log("limiter under limit, allow ($sessionCount)");
-            return false;
-        }
-
-        /* either over limit and block has expired or */
-        /* under limit and timeout has expired, so reset them */
-        //error_log("limiter expired, reset");
-        $this->resetRateLimit(false);
-        return false;
-    }
-
-    /**
-     * @return string returns a newly generated random uuid
-     */
-    private function newUUID(): string {
-        $data = random_bytes(16);
-        $data[6] = chr(ord($data[6]) & 0x0f | 0x40);
-        $data[8] = chr(ord($data[8]) & 0x3f | 0x80);
-        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
-    }
-
-    /**
-     * Upon valid token and non-empty id, creates a uuid, stores session file and sets the cookie
-     * @return bool returns true if token and id are provided, and token is valid, false otherwise
-     */
-    private function login(): bool {
-        /* fields must both be filled out */
-        if (isset($this->get[self::TOKEN_FIELD], $this->get[self::ID_FIELD]) &&
-            $this->get[self::TOKEN_FIELD] && $this->get[self::ID_FIELD]
-        ) {
-            /* filter user input */
-            $id = substr(preg_replace(self::URL64, '', $this->get[self::ID_FIELD]), 0, 100);
-            $otp = TOTP::createFromSecret($this->token);
-            $date = date('Y-m-d H:i:s');
-            $remoteHost = $this->getRemoteHost();
-
-            /* if given token is valid, login, store session file and set the cookie */
-            if ($otp->now() === $this->get[self::TOKEN_FIELD]) {
-                $this->id = $id;
-                $uuid = $this->newUUID();
-                $rawIV = random_bytes(openssl_cipher_iv_length(self::CIPHER));
-                $rawUUID = openssl_encrypt($uuid, self::CIPHER, $this->key, 0, $rawIV);
-                $encUUID = strtr(base64_encode($rawUUID), '-_', '+/');
-                file_put_contents(
-                    self::BASE . $encUUID,
-                    base64_encode($rawIV) .
-                    "\$$id\$$this->expire\$$date\$$remoteHost\$\n"
-                );
-                setcookie(
-                    self::NAME,
-                    $encUUID,
-                    $this->expire,
-                    '/',           /* all paths      */
-                    $this->domain, /* all subdomains */
-                    true,          /* https only     */
-                    true           /* no js access   */
-                );
-                error_log("[$date] successful login by id: $id");
-                /* successful login, reset the rate-limit and close */
-                $this->resetRateLimit();
-
-                return true;
-            }
-
-            /* login attempted and failed, update monitoring for rate limiting */
-            $sessionCount = (int)$_SESSION['count'];
-            $rateLimit    = (int)getenv('PREAUTH_RATE_LIMIT')   ?: 4;
-            $this->logFailedAttempt();
-
-            if (($sessionCount + 1) >= $rateLimit) {
-                /* +1 to count this failure */
-                error_log("[$date] rate-limiting trigger for: $remoteHost");
-                /* just reached the rate limit, block them */
-                include __DIR__ . '/../400.php';
-                exit(0);
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Determine real remote-host, if local address, find next level up
-     * @return string returns the real remote host (IP address)
-     */
-    private function getRemoteHost(): string {
-        $remoteHost = $_SERVER['REMOTE_HOST'];
-        if (IpUtils::isPrivateIp($remoteHost)) {
-            $remoteList = array_map('trim', explode(',', $_SERVER['HTTP_X_FORWARDED_FOR'] ?? ''));
-            $remoteIndex = array_search($remoteHost, $remoteList);
-            if ($remoteIndex > 0) {
-                $remoteHost = $remoteList[$remoteIndex - 1];
-            }
-        }
-        return $remoteHost;
-    }
-
-    /**
-     * [Re]Initialize the rate-limiting and close monitoring session (unless you pass false)
-     * @param bool $close Defaults to true, set to false to keep monitoring session open
-     */
-    private function resetRateLimit(bool $close = true): void {
-        $_SESSION['time'] = time();
-        $_SESSION['count'] = 0;
-        if ($close) {
-            session_write_close();
-        }
-    }
-
-    /**
-     * Note that login failed so we can determine if we should rate-limit future requests
-     */
-    private function logFailedAttempt(): void {
-        $_SESSION['time'] = time();
-        $_SESSION['count']++;
-        session_write_close();
-    }
-}
-

src/Clock.php

@@ -0,0 +1,15 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+use DateTimeImmutable;
+use Psr\Clock\ClockInterface;
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
+
+#[AsAlias(ClockInterface::class)]
+final readonly class Clock implements ClockInterface {
+    public function now(): DateTimeImmutable {
+        return new DateTimeImmutable();
+    }
+}

src/Command/GenerateBackupCodesCommand.php

@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Command;
+
+use App\PersistCache;
+use App\Service\BackupCodeInterface;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/** simple console command to generate backup codes
+ * usage: php bin/console app:generate-backup-codes [count] */
+final class GenerateBackupCodesCommand extends Command {
+    public function __construct(
+        private readonly BackupCodeInterface $manager,
+        private readonly PersistCache        $persistCache,
+    ) {
+        parent::__construct();
+    }
+
+    protected function configure(): void {
+        $this->setName('app:generate-backup-codes');
+        $this->setDescription('Generate single‑use backup codes')
+            ->addArgument('count', InputArgument::OPTIONAL, 'Number of codes to generate', 10);
+    }
+
+    /** @throws InvalidArgumentException */
+    protected function execute(InputInterface $input, OutputInterface $output): int {
+        /* since Kernel::terminate() does not get called, we must boot and persist explicitly */
+        $this->persistCache->boot();
+        $count = (int) $input->getArgument('count');
+        $codes = $this->manager->generate($count);
+        foreach ($codes as $code) {
+            $output->writeln($code);
+        }
+        $this->persistCache->persist();
+        return Command::SUCCESS;
+    }
+}

src/ConfigBag.php

@@ -0,0 +1,73 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+use Psr\Cache\InvalidArgumentException;
+use Psr\Clock\ClockInterface;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+
+final readonly class ConfigBag {
+    private ClockInterface $clock;
+    private int $cookieTtl;
+    private string $totpUri;
+    private ?int $ipTtl;
+    private bool $teapot;
+    private string $errorMessage;
+    private string $teapotTitle;
+    private string $tooManyTitle;
+
+    /** @throws InvalidArgumentException */
+    public function __construct(
+        Utilities                                  $utilities,
+        ClockInterface                             $clock,
+        #[Autowire('%app.cookie_ttl%')] int        $cookieTtl,
+        #[Autowire('%app.totp_uri%')] string       $totpUri,
+        #[Autowire('%app.ip_ttl%')] ?int           $ipTtl,
+        #[Autowire('%app.teapot%')] bool           $teapot,
+        #[Autowire('%app.error_message%')] string  $errorMessage,
+        #[Autowire('%app.teapot_title%')] string   $teapotTitle,
+        #[Autowire('%app.too_many_title%')] string $tooManyTitle,
+    ) {
+        $this->clock        = $clock;
+        $this->cookieTtl    = $cookieTtl;
+        $this->totpUri      = $totpUri ?: $utilities->loadTotp();
+        $this->ipTtl        = $ipTtl ?: null;
+        $this->teapot       = $teapot;
+        $this->errorMessage = $errorMessage;
+        $this->teapotTitle  = $teapotTitle;
+        $this->tooManyTitle = $tooManyTitle;
+    }
+
+    public function clock(): ClockInterface {
+        return $this->clock;
+    }
+
+    public function cookieTtl(): int {
+        return $this->cookieTtl;
+    }
+
+    public function totpUri(): string {
+        return $this->totpUri;
+    }
+
+    public function ipTtl(): ?int {
+        return $this->ipTtl;
+    }
+
+    public function teapot(): bool {
+        return $this->teapot;
+    }
+
+    public function errorMessage(): string {
+        return $this->errorMessage;
+    }
+
+    public function teapotTitle(): string {
+        return $this->teapotTitle;
+    }
+
+    public function tooManyTitle(): string {
+        return $this->tooManyTitle;
+    }
+}

src/Data/Payload.php

@@ -0,0 +1,78 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Data;
+
+use App\Enum\Scope;
+use Symfony\Component\HttpFoundation\InputBag;
+
+/** when scope is IP but ip-access is disabled, scope is to be considered cookie */
+final class Payload {
+    public string $id;    /* session name, identifying who is logging in */
+    public string $token; /* TOTP, typically six digits */
+    public string $nonce; /* random unique string, to block duplicate submissions */
+    public bool   $json;  /* should we return json (for the login page) */
+    public Scope  $scope; /* type of access being requested */
+
+    public static function decode(string $base64url): ?Payload {
+        /* convert the base64url into json string */
+        $json = base64_decode(str_pad(strtr($base64url, '-_', '+/'),
+            strlen($base64url) % 4, '='
+        ), true);
+        if ($json) {
+            /* convert the json string into real data */
+            $data = json_decode($json);
+            if (is_object($data)) {
+                return Payload::create($data);
+            }
+        }
+        return null;
+    }
+
+    public static function load(InputBag $input): ?Payload {
+        /* convert form data into real data */
+        if ($input->has('username') && $input->has('nonce') && $input->has('totp')) {
+            return Payload::create((object)[
+                'id'    => $input->get('username'),
+                'nonce' => $input->get('nonce'),
+                'token' => $input->get('totp'),
+                'json'  => false,
+            ]);
+        }
+        return null;
+    }
+
+    public static function create(object $data): ?Payload {
+        /* if missing required fields id, nonce, or token */
+        if (strlen(trim($data->id    ?? '')) < 1 ||
+            strlen(trim($data->nonce ?? '')) < 1 ||
+            strlen(trim($data->token ?? '')) < 1
+        ) {
+            /* returns null as the input is invalid */
+            return null;
+        }
+
+        /* all input is limited */
+        $payload = new Payload();
+        $payload->id    = mb_substr(trim($data->id), 0, 128);
+        $payload->nonce = mb_substr(trim($data->nonce), 0, 128);
+        $payload->json  = ($data->json ?? true);
+        $payload->scope = Scope::tryFrom($data->scope ?? '') ?? Scope::Cookie;
+        $payload->token = mb_substr(trim($data->token), 0, 128);
+
+        return Payload::constrict($payload);
+    }
+
+    public function toString(): string {
+        return json_encode($this);
+    }
+
+    private static function constrict(Payload $payload): Payload {
+        /* When scope is None, json will be considered false. */
+        if ($payload->scope === Scope::None) {
+            $payload->json = false;
+        }
+
+        return $payload;
+    }
+}

src/Enum/Scope.php

@@ -0,0 +1,11 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Enum;
+
+/** scope defines the context of how a session is persisted */
+enum Scope: string {
+    case Cookie = 'cookie';
+    case Ip     = 'ip';
+    case None   = 'none';
+}

src/Env.php

@@ -1,76 +0,0 @@
-<?php
-declare(strict_types=1);
-
-namespace Preauth;
-
-class Env {
-    /**
-     * @return string returns title of this system
-     */
-    public function getTitle(): string {
-        return getenv('PREAUTH_TITLE')
-            ?: 'Pre-Authentication System';
-    }
-
-    /**
-     * @return string returns background-color of this system
-     */
-    public function getColor(): string {
-        // defaults to teal
-        return getenv('PREAUTH_BACKGROUND') ?: '#029386';
-    }
-
-    /**
-     * @return string returns text-color of this system
-     */
-    public function getTextColor(): string {
-        // defaults to white
-        return getenv('PREAUTH_FOREGROUND') ?: '#ffffff';
-    }
-
-    /**
-     * @return string returns the name of the ID field
-     */
-    public function getIdName(): string {
-        return getenv('PREAUTH_ID_NAME') ?: 'Session ID';
-    }
-
-    /**
-     * @return string returns the name of the Token field
-     */
-    public function getTokenName(): string {
-        return getenv('PREAUTH_TOKEN_NAME')
-            ?: 'Authentication Token';
-    }
-
-    /**
-     * @return string returns the name of the Submit button
-     */
-    public function getSubmitName(): string {
-        return getenv('PREAUTH_SUBMIT_NAME') ?: 'Submit';
-    }
-
-    /**
-     * @return string returns the denied http status code
-     */
-    public function getDeniedCode(): string {
-        return getenv('PREAUTH_DENIED_CODE') ?: '418';
-    }
-
-    /**
-     * @return string returns the denied response title
-     */
-    public function getDeniedTitle(): string {
-        return getenv('PREAUTH_DENIED_TITLE')
-            ?: "I'm a teapot";
-    }
-
-    /**
-     * @return string returns the denied response message
-     */
-    public function getDeniedMessage(): string {
-        return getenv('PREAUTH_DENIED_MESSAGE')
-            ?: 'I refuse to brew coffee.';
-    }
-}
-

src/Kernel.php

@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Kernel as BaseKernel;
+
+class Kernel extends BaseKernel {
+    use MicroKernelTrait;
+
+    private PersistCache $persistCache;
+
+    /** @throws InvalidArgumentException */
+    public function boot(): void {
+        parent::boot();
+
+        $this->persistCache = $this->container->get(PersistCache::class);
+        $this->persistCache->boot();
+    }
+
+    /** @throws InvalidArgumentException */
+    public function terminate(Request $request, Response $response): void {
+        $this->persistCache->persist();
+
+        parent::terminate($request, $response);
+    }
+}

src/Listener/AcceptListener.php

@@ -0,0 +1,45 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Listener;
+
+use App\Service\DomainInterface;
+use App\Trait\CookieNameTrait;
+use App\Trait\HasLoggerTrait;
+use App\Trait\StringTrait;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+
+final readonly class AcceptListener {
+    use CookieNameTrait;
+    use HasLoggerTrait;
+    use StringTrait;
+
+    public function __construct(
+        private CacheItemPoolInterface $sessionCache,
+        private DomainInterface        $domainManager,
+    ) {}
+
+    /** @throws InvalidArgumentException */
+    #[AsEventListener(priority: 99)]
+    public function onKernelRequest(RequestEvent $event): void {
+        /* check if they sent the correct preauth cookie */
+        $cookieName = $this->domainManager->authBase() ?$this->authCookieName() : $this->cookieName();
+        if ($event->getRequest()->cookies->has($cookieName)) {
+            $cookie = $event->getRequest()->cookies->get($cookieName);
+            $cookieKey = $this->makeCacheKey("cookie_$cookie");
+            if ($cookie && $this->sessionCache->hasItem($cookieKey)) {
+                /* cookie sent corresponds to valid existing session */
+                $id = $this->sessionCache->getItem($cookieKey)->get();
+                $this->logger->debug("has valid cookie-session: $id");
+                $event->setResponse(new Response("hi $id", headers: [
+                    'Content-Type' => 'text/plain',
+                    'Remote-User'  => $id,
+                ]));
+            }
+        }
+    }
+}

src/Listener/AllowListener.php

@@ -0,0 +1,40 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Listener;
+
+use App\ConfigBag;
+use App\Trait\HasLoggerTrait;
+use App\Trait\StringTrait;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+
+final readonly class AllowListener {
+    use HasLoggerTrait;
+    use StringTrait;
+
+    public function __construct(
+        private CacheItemPoolInterface $sessionCache,
+        private ConfigBag              $config,
+    ) {}
+
+    /** @throws InvalidArgumentException */
+    #[AsEventListener(priority: 88)]
+    public function onKernelRequest(RequestEvent $event): void {
+        if ($this->config->ipTtl() > 0) {
+            $ipKey = $this->makeCacheKey("ip_{$event->getRequest()->getClientIp()}");
+            if ($this->sessionCache->hasItem($ipKey)) {
+                /* ip address corresponds to valid existing session  */
+                $id = $this->sessionCache->getItem($ipKey)->get();
+                $this->logger->debug("has valid ip-session: $id");
+                $event->setResponse(new Response("hi $id", headers: [
+                    'Content-Type' => 'text/plain',
+                    'Remote-User'  => $id,
+                ]));
+            }
+        }
+    }
+}

src/Listener/InterceptListener.php

@@ -0,0 +1,77 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Listener;
+
+use App\ConfigBag;
+use App\Service\DomainInterface;
+use App\Trait\CookieNameTrait;
+use App\Trait\HasLoggerTrait;
+use App\Trait\MakeNonceTrait;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Twig\Environment;
+use Twig\Error\LoaderError;
+use Twig\Error\RuntimeError;
+use Twig\Error\SyntaxError;
+
+final readonly class InterceptListener {
+    use CookieNameTrait;
+    use HasLoggerTrait;
+    use MakeNonceTrait;
+
+    public function __construct(
+        private ConfigBag       $config,
+        private DomainInterface $domainManager,
+        private Environment     $twig,
+    ) {}
+
+    /** @throws InvalidArgumentException|RuntimeError|SyntaxError|LoaderError */
+    #[AsEventListener(priority: 55)]
+    public function onKernelRequest(RequestEvent $event): void {
+        /* by this point, we know that the request we have is:
+         * not already authorized, nor already rate-limited,
+         * nor submitting login credentials; so redirect or present the login page now */
+        if ($this->domainManager->getAuthSubdomain() !== $event->getRequest()->getHost() &&
+            $this->domainManager->matchesAuth($event->getRequest()->getHost())
+        ) {
+            /* host matches base-domain of auth, but not on auth subdomain, redirect */
+            $query = http_build_query(['return' => $event->getRequest()->getUri()]);
+            $event->setResponse(new Response('', Response::HTTP_SEE_OTHER,
+                ['Location' => "https://{$this->domainManager->getAuthSubdomain()}/?$query"]
+            ));
+        } else {
+            $this->logger->debug("presenting login page: {$event->getRequest()->getClientIp()}");
+            $content = $this->twig->render('login.html.twig', [
+                'nonce' => $this->makeNonce(),
+                'post'  => $this->domainManager->getAuthSubdomain() === $event->getRequest()->getHost(),
+            ]);
+            $hasCookie = (bool) $event->getRequest()->cookies->get(
+                $this->domainManager->authBase() ? $this->authCookieName() : $this->cookieName()
+            );
+            $event->setResponse($this->pruneInvalidCookie(new Response($content,
+                Response::HTTP_UNAUTHORIZED, ['Content-Type' => 'text/html']
+            ), $hasCookie, $event->getRequest()->getHost()));
+        }
+    }
+
+    private function pruneInvalidCookie(Response $response, bool $hasCookie, string $host): Response {
+        if ($hasCookie) {
+            /* input here must match LoginListener::setCookie() */
+            $response->headers->clearCookie(
+                $this->domainManager->authBase() ? $this->authCookieName() : $this->cookieName(),
+                '/',
+                /* if using central auth, only set the domain if the host matches */
+                $this->domainManager->matchesAuth($host) ? $this->domainManager->authBase() : null,
+                true,
+                true,
+                Cookie::SAMESITE_STRICT
+            );
+        }
+
+        return $response;
+    }
+}

src/Listener/LoginListener.php

@@ -0,0 +1,117 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Listener;
+
+use App\ConfigBag;
+use App\Data\Payload;
+use App\Service\DomainInterface;
+use App\Service\LoginInterface;
+use App\Trait\CookieNameTrait;
+use App\Trait\HasLoggerTrait;
+use App\Trait\MakeNonceTrait;
+use App\Trait\StringTrait;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Attribute\Target;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\RateLimiter\RateLimiterFactoryInterface;
+use Twig\Environment;
+use Twig\Error\LoaderError;
+use Twig\Error\RuntimeError;
+use Twig\Error\SyntaxError;
+
+final readonly class LoginListener {
+    use CookieNameTrait;
+    use HasLoggerTrait;
+    use MakeNonceTrait;
+    use StringTrait;
+
+    private RateLimiterFactoryInterface $rateLimiter;
+
+    public function __construct(
+        private                    Environment                 $twig,
+        #[Target('login_limiter')] RateLimiterFactoryInterface $rateLimiter,
+        private                    DomainInterface             $domainManager,
+        private                    LoginInterface              $loginManager,
+        private                    ConfigBag                   $config,
+    ) {
+        $this->rateLimiter  = $rateLimiter;
+    }
+
+    /** @throws InvalidArgumentException|LoaderError|RuntimeError|SyntaxError */
+    #[AsEventListener(priority: 66)]
+    public function onKernelRequest(RequestEvent $event): void {
+        $payload  = null;
+        $response = null;
+
+        if ($event->getRequest()->headers->has($this->headerName())) {
+            /* if request contains our "X-Preauth" header */
+            $data = $event->getRequest()->headers->get($this->headerName());
+            $payload = Payload::decode($data);
+        } else if ($event->getRequest()->isMethod(Request::METHOD_POST) &&
+            $this->domainManager->getAuthSubdomain() === $event->getRequest()->getHost()
+        ) {
+            /* if request is a POST to the auth-subdomain */
+            $payload = Payload::load($event->getRequest()->getPayload());
+        } else {
+            /* no login attempt detected */
+            return;
+        }
+
+        if ($payload) {
+            /* user sent a valid payload, check it */
+            $response = $this->loginManager->checkToken($payload, $event->getRequest());
+
+            /* token or backup-code authentication was successful */
+            if ($response) {
+                $event->setResponse($response);
+                return;
+            }
+        }
+
+        /* login attempted but unsuccessful, log and block if needed */
+        $limitReached = $this->logFailure($event->getRequest());
+
+        $this->logger->debug("logging failure for: {$event->getRequest()->getClientIp()}");
+        $event->setResponse($this->makeFailedResponse($limitReached, $payload->json ?? true,
+            $event->getRequest()->getHost(), $this->makeCacheKey($payload ? $payload->id : '')
+        ));
+    }
+
+    private function logFailure(Request $request): bool {
+        $limiter = $this->rateLimiter->create($request->getClientIp());
+        return ($limiter->consume(1)->getRemainingTokens() < 1);
+    }
+
+    /** @throws InvalidArgumentException|RuntimeError|SyntaxError|LoaderError */
+    private function makeFailedResponse(bool $limited, bool $json, string $host, string $username): Response {
+        if ($limited) {
+            $status = $this->config->teapot() ? Response::HTTP_I_AM_A_TEAPOT
+                : Response::HTTP_TOO_MANY_REQUESTS;
+            $message = $this->config->teapot() ? $this->config->teapotTitle()
+                : $this->config->tooManyTitle();
+        } else {
+            $status  = Response::HTTP_UNAUTHORIZED;
+            $message = $this->config->errorMessage();
+        }
+        $answer = [
+            'message' => $message,
+            'nonce'   => $this->makeNonce(),
+            'post'    => $this->domainManager->getAuthSubdomain() === $host,
+            'username' => $username,
+        ];
+
+        if ($json) {
+            $contentType = 'application/json';
+            $content     = json_encode($answer);
+        } else {
+            $contentType = 'text/html';
+            $content     = $this->twig->render('login.html.twig', $answer);
+        }
+
+        return new Response($content, $status, ["Content-Type" => $contentType]);
+    }
+}

src/Listener/RejectListener.php

@@ -0,0 +1,47 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Listener;
+
+use App\ConfigBag;
+use App\Trait\HasLoggerTrait;
+use App\Trait\StringTrait;
+use Symfony\Component\DependencyInjection\Attribute\Target;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\RateLimiter\RateLimiterFactoryInterface;
+use Twig\Environment;
+use Twig\Error\LoaderError;
+use Twig\Error\RuntimeError;
+use Twig\Error\SyntaxError;
+
+final readonly class RejectListener {
+    use HasLoggerTrait;
+    use StringTrait;
+
+    private RateLimiterFactoryInterface $rateLimiter;
+
+    public function __construct(
+        private                    ConfigBag                   $config,
+        private                    Environment                 $twig,
+        #[Target('login_limiter')] RateLimiterFactoryInterface $rateLimiter,
+    ) {
+        $this->rateLimiter = $rateLimiter;
+    }
+
+    /** @throws SyntaxError|RuntimeError|LoaderError */
+    #[AsEventListener(priority: 77)]
+    public function onKernelRequest(RequestEvent $event): void {
+        /* check if they have made too many failed login attempts */
+        $limiter = $this->rateLimiter->create($event->getRequest()->getClientIp());
+        if ($limiter->consume(0)->getRemainingTokens() < 1) {
+            $this->logger->debug("already blocked: {$event->getRequest()->getClientIp()}");
+            $html = $this->twig->render('error.html.twig');
+            $event->setResponse(new Response($html, ($this->config->teapot()
+                ? Response::HTTP_I_AM_A_TEAPOT : Response::HTTP_TOO_MANY_REQUESTS),
+                ['Content-Type' => 'text/html']
+            ));
+        }
+    }
+}

src/MonitorCacheKeys.php

@@ -0,0 +1,177 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+use OutOfBoundsException;
+use Psr\Cache\CacheItemInterface;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+
+/* we must *NOT* store the key-list item or values within this object
+ * because it can change from outside this object instance */
+final readonly class MonitorCacheKeys implements CacheItemPoolInterface {
+    private const string KEY_LIST = '__key_list';
+    private const string CHANGE_LIST = '__chg_list';
+    public const int UPDATED = 1;
+    public const int REMOVED = 2;
+
+    private CacheItemPoolInterface $cache;
+
+    /** @throws InvalidArgumentException */
+    public function __construct(CacheItemPoolInterface $cache) {
+        $this->cache = $cache;
+        $items = $cache->getItems([self::KEY_LIST, self::CHANGE_LIST]);
+        foreach ($items as $item) {
+            if ( ! $item->isHit()) {
+                $this->initialize();
+                break;
+            }
+        }
+    }
+
+    /** @throws InvalidArgumentException */
+    private function initialize(): void {
+        $keyList = $this->cache->getItem(self::KEY_LIST);
+        $changeList = $this->cache->getItem(self::CHANGE_LIST);
+        $keyList->set([]);
+        $changeList->set([]);
+        $this->cache->saveDeferred($keyList);
+        $this->cache->saveDeferred($changeList);
+        $this->cache->commit();
+    }
+
+    /** @throws InvalidArgumentException */
+    public function getKeys(): array {
+        $keyList = $this->cache->getItem(self::KEY_LIST);
+        return array_keys($keyList->get() ?? []);
+    }
+
+    /** @throws InvalidArgumentException */
+    public function getChanges(): array {
+        $changeList = $this->cache->getItem(self::CHANGE_LIST);
+        return $changeList->get() ?? [];
+    }
+
+    /** @throws InvalidArgumentException */
+    public function markClean(): void {
+        $changeList = $this->cache->getItem(self::CHANGE_LIST);
+        $changeList->set([]);
+        $this->cache->save($changeList);
+    }
+
+    public function getItem(string $key): CacheItemInterface {
+        return $this->cache->getItem($key);
+    }
+
+    /** @return CacheItemInterface[]
+     *  @throws InvalidArgumentException */
+    public function getItems(array $keys = []): iterable {
+        return $this->cache->getItems($keys);
+    }
+
+    public function hasItem(string $key): bool {
+        return $this->cache->hasItem($key);
+    }
+
+    /** @throws InvalidArgumentException */
+    public function clear(): bool {
+        /* only bother clearing the pool if it is not empty */
+        if ( ! empty($this->getKeys())) {
+            $response = $this->cache->clear();
+
+            $this->initialize();
+            return $response;
+        }
+        return true;
+    }
+
+    public function deleteItem(string $key): bool {
+        $this->isValid($key);
+        $keyList = $this->cache->getItem(self::KEY_LIST);
+        $keyValues = $keyList->get();
+        if (isset($keyValues[$key])) {
+            unset($keyValues[$key]);
+            $keyList->set($keyValues);
+            $this->cache->saveDeferred($keyList);
+            $this->logChange($key, MonitorCacheKeys::REMOVED);
+            $this->cache->commit();
+        }
+
+        return $this->cache->deleteItem($key);
+    }
+
+    public function deleteItems(array $keys): bool {
+        $this->allValid($keys);
+        $keyList = $this->cache->getItem(self::KEY_LIST);
+        $keyValues = $keyList->get();
+        foreach ($keys as $key) {
+            if (isset($keyValues[$key])) {
+                unset($keyValues[$key]);
+                $this->logChange($key, MonitorCacheKeys::REMOVED);
+            }
+        }
+        $keyList->set($keyValues);
+        $this->cache->saveDeferred($keyList);
+        $this->cache->commit();
+
+        return $this->cache->deleteItems($keys);
+    }
+
+    /** @throws InvalidArgumentException */
+    public function save(CacheItemInterface $item): bool {
+        $this->update($item);
+        return $this->cache->save($item);
+    }
+
+    /** @throws InvalidArgumentException */
+    public function saveDeferred(CacheItemInterface $item): bool {
+        $this->update($item);
+        return $this->cache->saveDeferred($item);
+    }
+
+    public function commit(): bool {
+        return $this->cache->commit();
+    }
+
+    /** @throws InvalidArgumentException|OutOfBoundsException */
+    private function update(CacheItemInterface $item): void {
+        $this->isValid($item->getKey());
+        $keyList = $this->cache->getItem(self::KEY_LIST);
+        $keyValues = $keyList->get();
+        $keyValues[$item->getKey()] = true;
+        $keyList->set($keyValues);
+        $this->logChange($item->getKey());
+        $this->cache->saveDeferred($keyList);
+        $this->cache->commit();
+    }
+
+    /** @throws OutOfBoundsException */
+    private function isValid(string $key): void {
+        if ($key === self::KEY_LIST || $key === self::CHANGE_LIST) {
+            throw new OutOfBoundsException(
+                'Can not modify the private key or change lists'
+            );
+        }
+    }
+
+    /** @throws OutOfBoundsException */
+    private function allValid(array $keys): void {
+        if (in_array(self::KEY_LIST, $keys, true) ||
+            in_array(self::CHANGE_LIST, $keys, true)
+        ) {
+            throw new OutOfBoundsException(
+                'Can not modify the private key or change lists'
+            );
+        }
+    }
+
+    /** @throws InvalidArgumentException */
+    private function logChange(string $key, int $code = MonitorCacheKeys::UPDATED): void {
+        $changeList = $this->cache->getItem(self::CHANGE_LIST);
+        $changeValues = $changeList->get();
+        $changeValues[$key] = $code;
+        $changeList->set($changeValues);
+        $this->cache->saveDeferred($changeList);
+    }
+}

src/PersistCache.php

@@ -0,0 +1,55 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
+
+/* need autoconfigure so we get it from the service container in Kernel->boot() */
+#[Autoconfigure(public: true)]
+final readonly class PersistCache {
+    private MonitorCacheKeys $sessionCache;
+    private MonitorCacheKeys $sessionStorage;
+
+    /** @throws InvalidArgumentException */
+    public function __construct(
+        CacheItemPoolInterface $sessionCache,
+        CacheItemPoolInterface $sessionStorage,
+    ) {
+        $this->sessionCache   = new MonitorCacheKeys($sessionCache);
+        $this->sessionStorage = new MonitorCacheKeys($sessionStorage);
+    }
+
+    /** @throws InvalidArgumentException */
+    public function boot(): void {
+        /* the caches are considered warm as soon as they are not empty */
+        if (empty($this->sessionCache->getKeys())) {
+            $items = $this->sessionStorage->getItems($this->sessionStorage->getKeys());
+            foreach ($items as $item) {
+                $this->sessionCache->saveDeferred($item);
+            }
+            $this->sessionCache->markClean();
+            $this->sessionCache->commit();
+        }
+    }
+
+    /** @throws InvalidArgumentException */
+    public function persist(): void {
+        /* we only need to persist the changes made to the cache (if any) */
+        $changes = $this->sessionCache->getChanges();
+        if ($changes) {
+            $this->sessionCache->markClean();
+            $items = $this->sessionCache->getItems(array_keys($changes));
+            foreach ($items as $item) {
+                if (($changes[$item->getKey()] ?? null) === MonitorCacheKeys::REMOVED) {
+                    $this->sessionStorage->deleteItem($item->getKey());
+                } else {
+                    $this->sessionStorage->saveDeferred($item);
+                }
+            }
+            $this->sessionStorage->commit();
+        }
+    }
+}

src/Service/BackupCodeInterface.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Service;
+
+
+use Exception;
+use Psr\Cache\InvalidArgumentException;
+
+/** backup-codes are case‑insensitive alphanumeric strings
+ * they are single-use and marked as used after successful authentication */
+interface BackupCodeInterface {
+    /** generate a set of backup-codes and return them
+     * @param int $count Number of codes to generate
+     * @return string[] Generated backup codes
+     * @throws InvalidArgumentException|Exception */
+    public function generate(int $count = 0): array;
+
+    /** @throws InvalidArgumentException */
+    public function expire(): void;
+
+    /** check if backup-code is valid and mark it as used
+     * @param string $code Code supplied by the client
+     * @return bool true if the code is valid and unused
+     * @throws InvalidArgumentException */
+    public function verifyAndConsume(string $code): bool;
+}

src/Service/BackupCodeManager.php

@@ -0,0 +1,104 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\MonitorCacheKeys;
+use App\Trait\HasLoggerTrait;
+use App\Trait\StringTrait;
+use DateTimeImmutable;
+use Exception;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use App\Trait\GetTotpTrait;
+
+/** backup-codes are case‑insensitive alphanumeric strings
+ * they are single-use and marked as used after successful authentication */
+final readonly class BackupCodeManager implements BackupCodeInterface {
+    use GetTotpTrait;
+    use HasLoggerTrait;
+    use StringTrait;
+
+    private const int DEFAULT_COUNT = 10;
+    /* php base_convert() will break if given too long of an input */
+    const int MAX_LENGTH = 64;
+
+    private CacheItemPoolInterface $sessionCache;
+
+    /** @throws InvalidArgumentException */
+    public function __construct(CacheItemPoolInterface $sessionCache) {
+        $this->sessionCache = new MonitorCacheKeys($sessionCache);
+    }
+
+    /** generate a set of backup-codes and return them
+     * @param int $count Number of codes to generate
+     * @return string[] Generated backup codes
+     * @throws InvalidArgumentException|Exception */
+    public function generate(int $count = self::DEFAULT_COUNT): array {
+        $length = min($this->getTotp()->getDigits() + 2, self::MAX_LENGTH);
+        $codes = [];
+        for ($i = 0; $i < $count; $i++) {
+            /* output is alphanumeric string of given length */
+            $codes[] = strtolower(str_pad(substr(base_convert(bin2hex(
+                random_bytes($length)
+            ), 16, 36), 0, $length), $length, '0', STR_PAD_LEFT));
+        }
+        $this->saveCodes($codes);
+        $this->logger->info("generated {$count} backup codes");
+        return $codes;
+    }
+
+    /** @throws InvalidArgumentException */
+    public function expire(): void {
+        $itemsToRemove = [];
+        foreach ($this->sessionCache->getKeys() as $key) {
+            if (str_starts_with($key, 'backup_')) {
+                $itemsToRemove[] = $key;
+            }
+        }
+        if (count($itemsToRemove) > 0) {
+            $this->sessionCache->deleteItems($itemsToRemove);
+        }
+    }
+
+    /** check if backup-code is valid and mark it as used
+     * @param string $code Code supplied by the client
+     * @return bool true if the code is valid and unused
+     * @throws InvalidArgumentException */
+    public function verifyAndConsume(string $code): bool {
+        /* remove unallowed characters, since backup codes are case-insensitive alphanumeric */
+        $backupKey = 'backup_' . preg_replace('/[^a-z0-9]+/', '', strtolower($code));
+        $backupItem = $this->sessionCache->getItem($this->makeCacheKey($backupKey));
+        $this->logger->debug("checking backup code '{$backupKey}': " . ($backupItem->isHit() ? 'HIT & ' : 'miss & ') . ($backupItem->get() ? 'VALID' : 'invalid'));
+        if ($backupItem->isHit() && $backupItem->get()) {
+            $this->logger->debug("valid backup code");
+            /* mark backup code as spent */
+            $backupItem->set(false); /* used */
+            /* per PSR6, if no expiration is set, implementation may set a default,
+             * we want this to keep forever, so a few hundred years should do it */
+            $backupItem->expiresAt(DateTimeImmutable::createFromFormat(
+                'Y-m-d', '2999-12-31'
+            ));
+            $this->sessionCache->save($backupItem);
+
+            return true;
+        }
+        return false;
+    }
+
+    /** @throws InvalidArgumentException */
+    private function saveCodes(array $codes): void {
+        foreach ($codes as $code) {
+            $backupItem = $this->sessionCache->getItem($this->makeCacheKey(strtolower("backup_$code")));
+            /* mark backup code as ready */
+            $backupItem->set(true);
+            /* per PSR6, if no expiration is set, implementation may set a default,
+             * we want this to keep forever, so a few hundred years should do it */
+            $backupItem->expiresAt(DateTimeImmutable::createFromFormat(
+                'Y-m-d', '2999-12-31'
+            ));
+            $this->sessionCache->saveDeferred($backupItem);
+        }
+        $this->sessionCache->commit();
+    }
+}

src/Service/DomainInterface.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Service;
+
+interface DomainInterface {
+    /** IE: "auth.example.com" or null if not using a separate subdomain
+     * @return ?string Returns auth subdomain if configured, otherwise null */
+    public function getAuthSubdomain(): ?string;
+
+    /** check if given url is an acceptable url for redirection
+     * @param string $url Where we are thinking of sending the user
+     * @return bool Returns true if it is acceptable to send the user there */
+    public function validReturn(string $url): bool;
+
+    /** check if host-base matches auth-base
+     * @param string $host
+     * @return bool returns true if and only if host matches base domain of auth */
+    public function matchesAuth(string $host): bool;
+
+    /** IE: "example.com" if central auth is something like "auth.example.com"
+     * @return string|null returns base domain if we are doing central auth */
+    public function authBase(): ?string;
+}

src/Service/DomainManager.php

@@ -0,0 +1,120 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Service;
+
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+
+final readonly class DomainManager implements DomainInterface {
+    /* top-level-domains which are known to have multiple parts */
+    private const array TLD = [
+        'ai'  => ['com','net','off','org'],
+        'am'  => ['radio'],
+        'com' => ['br','cn','co','de','eu','gr','it','jpn','mex','ru','sa','uk','us','za'],
+        'de'  => ['com'],
+        'fm'  => ['radio'],
+        'gg'  => ['co','net','org'],
+        'in'  => ['co','firm','gen','ind','net','org'],
+        'je'  => ['co','net','org'],
+        'mx'  => ['com','net','org'],
+        'net' => ['gb','hu','in','jp','se','uk'],
+        'nz'  => ['co','net','org'],
+        'org' => ['ae','us'],
+        'ph'  => ['com','net','org'],
+        'se'  => ['com'],
+        'uk'  => ['co','me','org'],
+    ];
+
+    private bool $subdomainRedirect;
+    private string $authSubdomain;
+
+    public function __construct(
+        #[Autowire('%app.subdomain_redirect%')] bool $subdomainRedirect,
+        #[Autowire('%app.auth_subdomain%')] string   $authSubdomain,
+    ) {
+        $this->subdomainRedirect = $subdomainRedirect;
+        $this->authSubdomain = $authSubdomain;
+    }
+
+    /** IE: "auth.example.com" or null if not using a separate subdomain
+     * @return ?string Returns auth subdomain if configured, otherwise null */
+    public function getAuthSubdomain(): ?string {
+        if ($this->authBase()) {
+            return $this->authSubdomain;
+        }
+        return null;
+    }
+
+    /** check if given url is an acceptable url for redirection
+     * @param string $url Where we are thinking of sending the user
+     * @return bool Returns true if it is acceptable to send the user there */
+    public function validReturn(string $url): bool {
+        /* ensure url is valid and, when using an auth subdomain,
+         * that the url host matches the base domain */
+        if (!filter_var($url, FILTER_VALIDATE_URL)) {
+            return false;
+        }
+
+        if ($this->authBase()) {
+            $host = parse_url($url, PHP_URL_HOST);
+            if ($host === null) {
+                return false;
+            }
+            /* do not send the user to another domain */
+            return $this->matchesAuth($host);
+        }
+
+        return true;
+    }
+
+    /** check if host-base matches auth-base
+     * @param string $host
+     * @return bool returns true if and only if host matches base domain of auth */
+    public function matchesAuth(string $host): bool {
+        $hostBase = $this->baseDomain($host);
+        $authBase = $this->baseDomain($this->authSubdomain);
+        return $this->subdomainRedirect && $this->authSubdomain &&
+            $authBase && $authBase === $hostBase;
+    }
+
+    /** IE: "example.com" if central auth is something like "auth.example.com"
+     * @return string|null returns base domain if we are doing central auth */
+    public function authBase(): ?string {
+        if ($this->subdomainRedirect && $this->authSubdomain && $this->baseDomain($this->authSubdomain)) {
+            return $this->baseDomain($this->authSubdomain);
+        }
+        return null;
+    }
+
+    /** this lets us determine the base domain of the given ip, localhost, or domain
+     * "service.example.co.uk" into "example.co.uk" and "service.example.com" into "example.com"
+     * things like "localhost" and "8.8.8.8" will return null
+     * @param string $host ip, localhost, or domain with zero or more subdomains
+     * @return ?string returns null if host is ip or localhost otherwise domain with all subdomains removed */
+    private function baseDomain(string $host): ?string {
+        /* if host is an ip address (or localhost), leave it as is */
+        if (filter_var($host, FILTER_VALIDATE_IP) || $host === 'localhost') {
+            return null;
+        }
+
+        $parts = explode('.', $host);
+        $keep = $this->baseLength($parts);
+        $parts = array_slice($parts, -$keep);
+        return implode('.', $parts);
+    }
+
+    /** IE: ["www", "example", "com"] or ["www", "example", "co", "uk"]
+     * @param string[] $parts pieces of a domain split by "." dot
+     * @return int typically 2 but sometimes 3 */
+    private function baseLength(array $parts): int {
+        $length = count($parts);
+        $baseLength = min(2, $length);
+        /* check if host should retain 3 parts, due to TLD */
+        if (count($parts) > 2 && isset(self::TLD[$parts[$length-1]]) &&
+            in_array($parts[$length-2], self::TLD[$parts[$length-1]], true)
+        ) {
+            $baseLength = min(3, $length);
+        }
+        return $baseLength;
+    }
+}

src/Service/LoginInterface.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Service;
+
+use App\Data\Payload;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+interface LoginInterface {
+    /** @throws InvalidArgumentException */
+    public function checkToken(Payload $payload, Request $request): ?Response;
+}

src/Service/LoginManager.php

@@ -0,0 +1,148 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Service;
+
+use App\Data\Payload;
+use App\Enum\Scope;
+use App\MonitorCacheKeys;
+use App\Trait\CookieNameTrait;
+use App\Trait\GetTotpTrait;
+use App\Trait\MakeNonceTrait;
+use App\Trait\StringTrait;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+use Symfony\Component\Uid\Ulid;
+
+final readonly class LoginManager implements LoginInterface {
+    use CookieNameTrait;
+    use GetTotpTrait;
+    use MakeNonceTrait;
+    use StringTrait;
+
+    private CacheItemPoolInterface $sessionCache;
+
+    /** @throws InvalidArgumentException */
+    public function __construct(
+                CacheItemPoolInterface $sessionCache,
+        private BackupCodeInterface    $backupCodeManager,
+        private DomainInterface        $domainManager,
+    ) {
+        $this->sessionCache = new MonitorCacheKeys($sessionCache);
+    }
+
+    /** @throws InvalidArgumentException */
+    public function checkToken(Payload $payload, Request $request): ?Response {
+        /* when scope is IP but ip-access is disabled, scope is to be considered cookie */
+        if ($payload->scope === Scope::Ip && ! $this->config->ipTtl()) {
+            /* requested to grant ip access, but that is not enabled */
+            $payload->scope = Scope::Cookie;
+        }
+
+        if ($this->getTotp()->verify($payload->token, null, 10) ||
+            $this->backupCodeManager->verifyAndConsume($payload->token)
+        ) {
+            /* token is correct (TOTP or Backup) */
+
+            /* if server nonce is found and is valid */
+            $nonceItem = $this->nonceCache->getItem($this->makeCacheKey($payload->nonce));
+            if ($nonceItem->isHit() && $nonceItem->get()) {
+                /* mark nonce as spent */
+                $nonceItem->set(false); /* invalid */
+                $nonceItem->expiresAfter(LoginManager::NONCE_TTL); /* keep briefly */
+                $this->nonceCache->save($nonceItem);
+
+                /* token authentication successful, grant access and set response */
+                $cleanId = $this->makeCacheKey($payload->id);
+
+                /* if they just want this one page, return ok, to grant them access */
+                $response = new Response("hi $cleanId", headers: [
+                    'Content-Type' => 'text/plain',
+                    'Remote-User'  => $cleanId,
+                ]);
+
+                if ($payload->scope !== Scope::None) {
+                    /* grant access based on the requested scope */
+                    if ($payload->scope === Scope::Cookie) {
+                        $response->headers->setCookie($this->setCookie($cleanId, $request->getHost()));
+                    } else if ($payload->scope === Scope::Ip) {
+                        $this->setIp($cleanId, $request->getClientIp());
+                    }
+
+                    if ($payload->json) {
+                        $contentType = 'application/json';
+                        $content     = json_encode([
+                            'message' => 'Login successful',
+                            'nonce'   => null,
+                        ]);
+                    } else {
+                        $contentType = 'text/html';
+                        $content     = "hi $cleanId, please reload";
+                    }
+
+                    $location = $request->query->has('return') &&
+                    $this->domainManager->validReturn($request->query->get('return')) ?
+                        "{$request->query->get('return')}" :
+                        "{$request->getPathInfo()}{$request->getQueryString()}";
+
+                    /* force redirect to use GET method (important when using central auth) */
+                    $response->setContent($content)
+                        ->setStatusCode(Response::HTTP_SEE_OTHER)
+                        ->headers->set('Location', $location);
+                    $response->headers->set('Content-Type', $contentType);
+                }
+
+                $this->logger->debug("successful login for: $cleanId");
+                return $response;
+            }
+        }
+        return null;
+    }
+
+    /** @throws InvalidArgumentException */
+    private function setCookie(string $id, string $host): Cookie {
+        /* successful auth with token, store session and set the cookie */
+        $ulid = new Ulid();
+        $sessionCookie = $this->sessionCache->getItem(
+            $this->makeCacheKey("cookie_$ulid")
+        );
+        if ($sessionCookie->isHit()) {
+            /* it is supposed to be impossible to have collisions */
+            $this->logger->error("aborting: ULID collision");
+            throw new HttpException(Response::HTTP_INTERNAL_SERVER_ERROR, 'Internal Server Error');
+        }
+        $sessionCookie->set($id);
+        $sessionCookie->expiresAfter($this->config->cookieTtl());
+        $this->sessionCache->save($sessionCookie);
+
+        /* when using subdomain-auth we have to use a different cookie name, as the
+         * "__Host-Http-" prefix we normally use does not allow domain to be set */
+        /* changes here must be reflected in InterceptListener::pruneInvalidCookie() */
+        return Cookie::create(
+            name: $this->domainManager->authBase() ? $this->authCookieName() : $this->cookieName(),
+            value: $ulid->toString(),
+            expire: time() + $this->config->cookieTtl(),
+            path: '/',
+            /* if using central auth, only set the domain if the host matches */
+            domain: $this->domainManager->matchesAuth($host) ? $this->domainManager->authBase() : null,
+            secure: true,
+            httpOnly: true,
+            sameSite: Cookie::SAMESITE_STRICT,
+        );
+    }
+
+    /** @throws InvalidArgumentException */
+    private function setIp(string $id, string $ip): void {
+        /* successful auth with token, requested scope of ip (and ip access enabled) */
+        $ipKey = $this->makeCacheKey("ip_$ip");
+
+        $sessionIp = $this->sessionCache->getItem($ipKey);
+        $sessionIp->set($id);
+        $sessionIp->expiresAfter($this->config->ipTtl());
+        $this->sessionCache->save($sessionIp);
+    }
+}

src/Trait/CookieNameTrait.php

@@ -0,0 +1,22 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Trait;
+
+trait CookieNameTrait {
+    private const string COOKIE_NAME = '__Host-Http-Preauth';
+    private const string AUTH_COOKIE_NAME = '__Http-Domain-Preauth';
+    private const string HEADER_NAME = 'X-Preauth';
+
+    final protected function cookieName(): string {
+        return static::COOKIE_NAME;
+    }
+
+    final protected function authCookieName(): string {
+        return static::AUTH_COOKIE_NAME;
+    }
+
+    final protected function headerName(): string {
+        return static::HEADER_NAME;
+    }
+}

src/Trait/GetTotpTrait.php

@@ -0,0 +1,29 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Trait;
+
+use App\ConfigBag;
+use OTPHP\Factory;
+use OTPHP\TOTPInterface;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+use Symfony\Contracts\Service\Attribute\Required;
+
+trait GetTotpTrait {
+    protected readonly ConfigBag $config;
+
+    #[Required]
+    public function setConfig(ConfigBag $config): void {
+        $this->config = $config;
+    }
+
+    protected function getTotp(): TOTPInterface {
+        $otp = Factory::loadFromProvisioningUri(
+            $this->config->totpUri(), $this->config->clock()
+        );
+        if ($otp instanceof TOTPInterface) {
+            return $otp;
+        }
+        throw new HttpException(500, 'Internal Server Exception');
+    }
+}

src/Trait/HasLoggerTrait.php

@@ -0,0 +1,16 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Trait;
+
+use Psr\Log\LoggerInterface;
+use Symfony\Contracts\Service\Attribute\Required;
+
+trait HasLoggerTrait {
+    protected readonly LoggerInterface $logger;
+
+    #[Required]
+    public function setLogger(LoggerInterface $logger): void {
+        $this->logger = $logger;
+    }
+}

src/Trait/MakeNonceTrait.php

@@ -0,0 +1,54 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Trait;
+
+use Exception;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+use Symfony\Contracts\Service\Attribute\Required;
+
+trait MakeNonceTrait {
+    use HasLoggerTrait;
+    use StringTrait;
+
+    /* 15 bytes neatly fits in base64 */
+    private const int NONCE_LENGTH = 15;
+    private const int NONCE_TTL = 120;
+
+    protected readonly CacheItemPoolInterface $nonceCache;
+
+    #[Required]
+    public function setNonceCache(CacheItemPoolInterface $nonceCache): void {
+        $this->nonceCache = $nonceCache;
+    }
+
+    /** @throws InvalidArgumentException|Exception */
+    protected function makeNonce(int $retries = 3): string {
+        /* convert raw binary into base64url */
+        $nonce = rtrim(strtr(base64_encode(random_bytes(
+            static::NONCE_LENGTH
+        )), '+/', '-_'), '=');
+        $nonceItem = $this->nonceCache->getItem($this->makeCacheKey($nonce));
+
+        if ($nonceItem->isHit()) {
+            if ($retries < 1) {
+                $this->logger->error("aborting: multiple nonce collisions");
+                throw new HttpException(
+                    Response::HTTP_INTERNAL_SERVER_ERROR,
+                    'Internal Server Error'
+                );
+            }
+            /* managed to have a collision, try again */
+            return $this->makeNonce($retries - 1);
+        }
+
+        $nonceItem->set(true); /* valid */
+        $nonceItem->expiresAfter(static::NONCE_TTL);
+        $this->logger->debug("added nonce: $nonce");
+        $this->nonceCache->save($nonceItem);
+        return $nonce;
+    }
+}

src/Trait/StringTrait.php

@@ -0,0 +1,13 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Trait;
+
+trait StringTrait {
+    /* cache keys can safely use alphanumeric, "_", and ".", remove the rest */
+    private const string KEY_REGEX = '/[^A-Za-z0-9_.]+/';
+
+    public function makeCacheKey(string $name): string {
+        return mb_substr(preg_replace(static::KEY_REGEX, '_', $name), 0, 128);
+    }
+}

src/Utilities.php

@@ -0,0 +1,61 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+use BaconQrCode\Renderer\PlainTextRenderer;
+use BaconQrCode\Writer;
+use DateTimeImmutable;
+use OTPHP\TOTP;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Cache\InvalidArgumentException;
+use Psr\Clock\ClockInterface;
+
+final readonly class Utilities {
+    public function __construct(
+        private ClockInterface         $clock,
+        private CacheItemPoolInterface $appPool,
+    ) {}
+
+    /** @throws InvalidArgumentException */
+    public function loadTotp(): string {
+        /* user forgot to set their TOTP_URI in the environment */
+        if ($this->appPool->hasItem('totp')) {
+            $totp = $this->appPool->getItem('totp')->get();
+        } else {
+            $totp = $this->makeTotp();
+        }
+
+        $this->showTotp($totp);
+        return $totp;
+    }
+
+    /** @throws InvalidArgumentException */
+    private function makeTotp(): string {
+        /* we have not stored a totp into the app cache yet */
+        $totpObj = TOTP::generate($this->clock);
+        $totpObj->setLabel('Preauth-TOTP');
+        $totp = $totpObj->getProvisioningUri();
+        $totpItem = $this->appPool->getItem('totp');
+        $totpItem->set($totp);
+        /* per PSR6, if no expiration is set, implementation may set a default,
+         * we want this to keep forever, so a few hundred years should do it */
+        $totpItem->expiresAt(DateTimeImmutable::createFromFormat(
+            'Y-m-d', '2999-12-31'
+        ));
+        $this->appPool->save($totpItem);
+        return $totp;
+    }
+
+    private function showTotp(string $totp): void {
+        $writer = new Writer(new PlainTextRenderer());
+        file_put_contents(
+            'php://stderr', <<<RAW
+            {$writer->writeString($totp)}
+            $totp
+            loading TOTP, because the env is not set, please copy above into TOTP_URI
+
+            RAW, FILE_APPEND
+        );
+    }
+}

symfony.lock

@@ -0,0 +1,97 @@
+{
+    "phpunit/phpunit": {
+        "version": "13.2",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "11.1",
+            "ref": "ca0bc067abfb40a8de1b2561b96cbfc2b833c314"
+        },
+        "files": [
+            ".env.test",
+            "phpunit.dist.xml",
+            "tests/bootstrap.php",
+            "bin/phpunit"
+        ]
+    },
+    "symfony/console": {
+        "version": "7.4",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "5.3",
+            "ref": "1781ff40d8a17d87cf53f8d4cf0c8346ed2bb461"
+        },
+        "files": [
+            "bin/console"
+        ]
+    },
+    "symfony/flex": {
+        "version": "2.10",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "2.4",
+            "ref": "52e9754527a15e2b79d9a610f98185a1fe46622a"
+        },
+        "files": [
+            ".env",
+            ".env.dev"
+        ]
+    },
+    "symfony/framework-bundle": {
+        "version": "7.4",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "7.4",
+            "ref": "09f6e081c763a206802674ce0cb34a022f0ffc6d"
+        },
+        "files": [
+            "config/packages/cache.yaml",
+            "config/packages/framework.yaml",
+            "config/preload.php",
+            "config/routes/framework.yaml",
+            "config/services.yaml",
+            "public/index.php",
+            "src/Controller/.gitignore",
+            "src/Kernel.php",
+            ".editorconfig"
+        ]
+    },
+    "symfony/routing": {
+        "version": "7.4",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "7.4",
+            "ref": "bc94c4fd86f393f3ab3947c18b830ea343e51ded"
+        },
+        "files": [
+            "config/packages/routing.yaml",
+            "config/routes.yaml"
+        ]
+    },
+    "symfony/twig-bundle": {
+        "version": "7.4",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "6.4",
+            "ref": "cab5fd2a13a45c266d45a7d9337e28dee6272877"
+        },
+        "files": [
+            "config/packages/twig.yaml",
+            "templates/base.html.twig"
+        ]
+    },
+    "symfony/uid": {
+        "version": "7.4",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "7.0",
+            "ref": "0df5844274d871b37fc3816c57a768ffc60a43a5"
+        }
+    }
+}

template.php

@@ -1,75 +0,0 @@
-<?php
-use Preauth\Auth;
-use Preauth\Env;
-global $auth;
-$env = new Env();
-?>
-<!doctype html>
-<html lang="en">
-<head>
-  <meta charset="utf-8">
-  <title><?php echo $env->getTitle(); ?></title>
-  <meta name="viewport" content="width=device-width, initial-scale=1">
-  <!-- Begin Icons -->
-  <link rel="apple-touch-icon" sizes="180x180" href="https://<?php echo $auth->getBaseDomain(); ?>/apple-touch-icon.png">
-  <link rel="icon" type="image/png" sizes="32x32" href="https://<?php echo $auth->getBaseDomain(); ?>/favicon-32x32.png">
-  <link rel="icon" type="image/png" sizes="192x192" href="https://<?php echo $auth->getBaseDomain(); ?>/android-chrome-192x192.png">
-  <link rel="icon" type="image/png" sizes="16x16" href="https://<?php echo $auth->getBaseDomain(); ?>/favicon-16x16.png">
-  <link rel="manifest" href="https://<?php echo $auth->getBaseDomain(); ?>/site.webmanifest">
-  <meta name="apple-mobile-web-app-title" content="<?php echo $env->getTitle(); ?>">
-  <meta name="application-name" content="<?php echo $env->getTitle(); ?>">
-  <meta name="msapplication-TileColor" content="<?php echo $env->getColor(); ?>">
-  <meta name="theme-color" content="<?php echo $env->getColor(); ?>">
-  <!-- End Icons -->
-  <style>
-    * {
-      margin: 0;
-      padding: 0.25em;
-    }
-    html {
-      background-color: <?php echo $env->getColor(); ?>;
-      color: <?php echo $env->getTextColor(); ?>;
-      display: table;
-      font-family: sans-serif;
-      font-size: 1.5em;
-      height: 100%;
-      padding: 0;
-      width: 100%;
-    }
-    body {
-      display: table-cell;
-      vertical-align: middle;
-    }
-    h1 {
-      font-size: 2.5em;
-      font-weight: normal;
-      text-align: center;
-    }
-    form {
-      display: flex;
-      flex-wrap: wrap;
-      justify-content: center;
-    }
-    form div {
-      width: 45%;
-    }
-    div.right {
-      text-align: right;
-    }
-    div.center {
-      text-align: center;
-    }
-  </style>
-</head>
-<body>
-  <h1><?php echo $env->getTitle(); ?></h1>
-  <form action="/" method="get">
-    <input type="hidden" name="<?php echo Auth::RETURN_FIELD; ?>" value="<?php echo $auth->getReturnTo(); ?>">
-    <div class="right"><label for="id"><?php echo $env->getIdName(); ?>:</label></div>
-    <div><input type="text" name="<?php echo Auth::ID_FIELD; ?>" id="id" autocomplete="on" required="required" autofocus="autofocus"></div>
-    <div class="right"><label for="token"><?php echo $env->getTokenName(); ?>:</label></div>
-    <div><input type="text" name="<?php echo Auth::TOKEN_FIELD; ?>" id="token" autocomplete="off" required="required"></div>
-    <div class="center"><button type="submit"><?php echo $env->getSubmitName(); ?></button></div>
-  </form>
-</body>
-</html>

templates/_script.html.twig

@@ -0,0 +1,84 @@
+<script>
+const form    = document.getElementById('preauth-form');
+const message = document.getElementById('preauth-message');
+const body    = document.getElementById('preauth-body');
+const style   = document.getElementById('preauth-style');
+
+form.addEventListener('submit', (event) => {
+    event.preventDefault();
+
+    {# make base64url string containing our payload json object #}
+    const data = btoa(JSON.stringify({
+        id:    form.username.value?.trim() ?? '',
+        token: form.totp.value?.trim() ?? '',
+        nonce: form.nonce.value?.trim() ?? '',
+        json:  true
+    })).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
+
+    {# send our request to the server #}
+    fetch(window.location.href, {
+        method: 'GET',
+        headers: { 'X-Preauth': data },
+    }).then((response) => {
+        {% if env.debug > 2 -%}
+            console.log(response);
+        {% endif -%}
+        if (response.headers.has('Location')) {
+            {# follow redirect (probably not needed) #}
+            {% if env.debug > 2 -%}
+                console.log('got redirect response');
+            {% endif -%}
+            window.location.href = response.headers.get('Location');
+        } else if (response.headers.get('Content-Type')?.toLowerCase().includes('application/json') ?? false) {
+            {# got json, update the page #}
+            {% if env.debug > 2 -%}
+                console.log('got json response');
+            {% endif -%}
+            response.json().then((content) => {
+                if (Object.hasOwn(content, 'message')) {
+                    message.innerText = content.message;
+                }
+                if (Object.hasOwn(content, 'nonce')) {
+                    form.nonce.value = content.nonce;
+                    form.totp.value = '';
+                    form.totp.focus();
+                }
+            }).catch((error) => {
+                console.log('failed to parse json from response');
+                console.log(error);
+            });
+        } else if (response.headers.get('Content-Type')?.toLowerCase().includes('text/html') ?? false) {
+            {# got html, replace the page #}
+            {% if env.debug > 2 -%}
+                console.log('got html response');
+            {% endif -%}
+            response.text().then((html) => {
+                document.open();
+                document.write(html);
+                document.close();
+            }).catch((error) => {
+                console.log('failed to get html from response');
+                console.log(error);
+            });
+        } else {
+            {# non-json, non-html, non-redirect response #}
+            {# update the page, change style to plain text #}
+            {% if env.debug > 2 -%}
+                console.log('got misc response');
+            {% endif -%}
+            response.text().then((text) => {
+                body.innerText = text;
+                style.disabled = true;
+                body.style.whiteSpace = 'pre-wrap';
+                body.style.wordWrap = 'break-word';
+            }).catch((error) => {
+                console.log('failed to get text from response');
+                console.log(error);
+            });
+        }
+    }).catch((error) => {
+        console.log('failed to get response');
+        console.log(error);
+    });
+});
+</script>

templates/_style.html.twig

@@ -0,0 +1,17 @@
+<style id="preauth-style">
+* { margin: 0; padding: 0.25em; }
+html { background-color: {{ env.bg_color }}; color: {{ env.fg_color }}; display: table;
+    font-family: sans-serif; font-size: 1.5em; height: 100%; padding: 0; width: 100%; }
+body { display: table-cell; vertical-align: middle; }
+h1 { font-size: 2.5em; font-weight: normal; text-align: center; }
+p { color: {{ env.error_color }}; text-align: center; }
+form { align-items: baseline; display: flex; flex-wrap: wrap; justify-content: center; }
+form div { width: 45%; min-width: 300px; }
+div.right { text-align: right; margin-top: 1em; padding-bottom: 0 }
+div.center { text-align: center; }
+div.hidden { display: none; }
+span { cursor: pointer; font-size: 0.75em; text-decoration: underline; }
+button { background-color: #cccccc; }
+input { background-color: #ffffff; max-width: 100%; }
+button, input { border: 0.0625em solid #333333; border-radius: 0.25em; color: #333333; font-size: 0.9em; }
+</style>

templates/base.html.twig

@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <title>{{ env.title }}</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
+    {{- include('_style.html.twig') -}}
+</head>
+<body id="preauth-body">
+{% block content %}{% endblock %}
+</body>
+</html>

templates/error.html.twig

@@ -0,0 +1,11 @@
+{% extends 'base.html.twig' %}
+
+{% block content %}
+{% if env.teapot|default(true) %}
+    <h1>{{ env.teapot_title }}</h1>
+    <p>{{ env.teapot_message }}</p>
+{% else %}
+    <h1>{{ env.too_many_title }}</h1>
+    <p>{{ env.too_many_message }}</p>
+{% endif %}
+{% endblock %}

templates/login.html.twig

@@ -0,0 +1,19 @@
+{% extends 'base.html.twig' %}
+
+{% block content %}
+<h1>{{ env.title }}</h1>
+<p id="preauth-message">{{ message|default }}</p>
+<form id="preauth-form" {% if post ?? false -%} method="post" {%- endif %}>
+    <input id="nonce" type="hidden" name="nonce" value="{{ nonce }}">
+    <div class="right"><label for="username">{{ env.id_name }}:</label></div>
+    <div><input type="text" name="username" id="username" {% if username ?? false %}value="{{ username }}"{% endif %}
+        autocomplete="username" required="required" autofocus="autofocus"></div>
+    <div class="right"><label for="totp">{{ env.token_name }}:</label></div>
+    <div><input type="text" name="totp" id="totp"
+        autocomplete="one-time-code" required="required"></div>
+    <div class="center"><button type="submit">{{ env.submit_name }}</button></div>
+</form>
+{% if not post ?? false %}
+    {{- include('_script.html.twig') -}}
+{% endif %}
+{% endblock %}

tests/Functional/AuthenticationFlowTest.php

@@ -0,0 +1,485 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Functional;
+
+use App\Data\Payload;
+use App\Enum\Scope;
+use OTPHP\TOTP;
+use Symfony\Bundle\FrameworkBundle\KernelBrowser;
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+/**
+ * End-to-end functional tests exercising the full HTTP kernel: the request
+ * travels through RejectListener -> LoginListener -> AllowListener ->
+ * AcceptListener -> InterceptListener and the services they orchestrate.
+ */
+final class AuthenticationFlowTest extends WebTestCase {
+
+    private const string TOTP_SECRET = 'JBSWY3DPEHPK3PXP';
+    private const string COOKIE_NAME = '__Host-Http-Preauth';
+
+    protected static function createClient(array $options = [], array $server = []): KernelBrowser
+    {
+        $client = parent::createClient($options, $server);
+        // The app stores nonces in the (in-memory) nonceCache pool.  In
+        // production APCu keeps them across requests, but KernelBrowser
+        // reboots the kernel between requests by default which would lose
+        // them.  Disable the reboot so the nonce issued on the login-page
+        // request survives to the login-submission request.
+        $client->disableReboot();
+
+        return $client;
+    }
+
+    private function validTotpCode(): string {
+        // the app uses the real system clock, so generate the code for now()
+        return TOTP::createFromSecret(self::TOTP_SECRET)->now();
+    }
+
+    /** base64url-encode a payload, matching the client-side JS / X-Preauth header. */
+    private function encodePayload(array $data): string {
+        $json = json_encode($data, JSON_THROW_ON_ERROR);
+        return rtrim(strtr(base64_encode($json), '+/', '-_'), '=');
+    }
+
+    private function loginPayload(
+        string $id = 'testuser',
+        ?string $token = null,
+        string $nonce = 'test-nonce-abc',
+        bool $json = true,
+    ): string {
+        return $this->encodePayload([
+            'id'    => $id,
+            'token' => $token ?? $this->validTotpCode(),
+            'nonce' => $nonce,
+            'json'  => $json,
+        ]);
+    }
+
+    /* ── unauthenticated access ──────────────────────────────────────── */
+
+    public function testUnauthenticatedRequestShowsLoginPage(): void {
+        $client = static::createClient();
+        $client->request('GET', '/');
+
+        // login page is served with 401 (Unauthorized) to signal the proxy
+        self::assertSame(401, $client->getResponse()->getStatusCode());
+        self::assertSelectorExists('form#preauth-form');
+        self::assertSelectorExists('input[name="nonce"]');
+        self::assertSelectorExists('input[name="username"]');
+        self::assertSelectorExists('input[name="totp"]');
+    }
+
+    public function testLoginPageContainsGeneratedNonce(): void {
+        $client = static::createClient();
+        $crawler = $client->request('GET', '/');
+
+        $nonceInput = $crawler->filter('input[name="nonce"]')->attr('value');
+        self::assertNotEmpty($nonceInput);
+        // base64url charset
+        self::assertMatchesRegularExpression('/^[A-Za-z0-9_-]+$/', $nonceInput);
+    }
+
+    public function testLoginFormDoesNotUsePostMethodWithoutAuthSubdomain(): void {
+        $client = static::createClient();
+        $crawler = $client->request('GET', '/');
+
+        $form = $crawler->filter('form#preauth-form');
+        // without central auth, the form should NOT have method="post"
+        $method = $form->attr('method');
+        self::assertNull($method);
+    }
+
+    /* ── successful TOTP login ────────────────────────────────────────── */
+
+    public function testSuccessfulTotpLoginViaHeaderSetsCookieAndRedirects(): void {
+        $client = static::createClient();
+
+        // first, grab a valid nonce from the login page
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+        self::assertNotEmpty($nonce);
+
+        // now submit a valid TOTP via the X-Preauth header
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'alice',
+                'token' => $this->validTotpCode(),
+                'nonce' => $nonce,
+                'json'  => true,
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(303, $response->getStatusCode()); // SEE_OTHER
+        self::assertTrue($response->headers->has('Location'));
+        // a session cookie should be set
+        $cookies = $response->headers->getCookies();
+        $hasPreauthCookie = false;
+        foreach ($cookies as $cookie) {
+            if (str_contains($cookie->getName(), 'Preauth')) {
+                $hasPreauthCookie = true;
+            }
+        }
+        self::assertTrue($hasPreauthCookie, 'Expected a preauth cookie to be set after login');
+    }
+
+    public function testSuccessfulLoginReturnsJsonWhenJsonRequested(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'bob',
+                'token' => $this->validTotpCode(),
+                'nonce' => $nonce,
+                'json'  => true,
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(303, $response->getStatusCode());
+        self::assertSame('application/json', $response->headers->get('Content-Type'));
+        $body = json_decode($response->getContent(), true);
+        self::assertSame('Login successful', $body['message']);
+    }
+
+    public function testSuccessfulLoginReturnsHtmlWhenJsonFalse(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'carol',
+                'token' => $this->validTotpCode(),
+                'nonce' => $nonce,
+                'json'  => false,
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(303, $response->getStatusCode());
+        self::assertStringStartsWith('text/html', $response->headers->get('Content-Type'));
+    }
+
+    public function testAuthenticatedCookieAccessAfterLogin(): void {
+        $client = static::createClient();
+
+        // login
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'dave',
+                'token' => $this->validTotpCode(),
+                'nonce' => $nonce,
+                'json'  => true,
+            ]),
+        ]);
+
+        // grab the cookie value from the login response
+        $loginResponse = $client->getResponse();
+        $cookieValue = null;
+        foreach ($loginResponse->headers->getCookies() as $cookie) {
+            if (str_contains($cookie->getName(), 'Preauth')) {
+                $cookieValue = $cookie->getValue();
+            }
+        }
+        self::assertNotNull($cookieValue);
+
+        // the cookie was set with secure=true, so the CookieJar will only
+        // send it over HTTPS; the KernelBrowser automatically updates the
+        // CookieJar from the login response, so the next request over HTTPS
+        // will include it
+        $client->request('GET', 'https://localhost/dashboard');
+
+        $response = $client->getResponse();
+        self::assertSame(200, $response->getStatusCode());
+        self::assertSame('dave', $response->headers->get('Remote-User'));
+    }
+
+    public function testScopeNoneReturnsPlainTextWithoutRedirect(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'eve',
+                'token' => $this->validTotpCode(),
+                'nonce' => $nonce,
+                'scope' => 'none',
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(200, $response->getStatusCode());
+        self::assertStringStartsWith('text/plain', $response->headers->get('Content-Type'));
+        self::assertSame('eve', $response->headers->get('Remote-User'));
+        // no redirect for scope=none
+        self::assertFalse($response->headers->has('Location'));
+    }
+
+    /* ── failed login ─────────────────────────────────────────────────── */
+
+    public function testFailedLoginReturnsUnauthorizedJsonWithError(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'alice',
+                'token' => '000000', // wrong code
+                'nonce' => $nonce,
+                'json'  => true,
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(401, $response->getStatusCode());
+        self::assertSame('application/json', $response->headers->get('Content-Type'));
+        $body = json_decode($response->getContent(), true);
+        self::assertArrayHasKey('message', $body);
+        self::assertArrayHasKey('nonce', $body);
+        // a fresh nonce should be returned for the next attempt
+        self::assertNotEmpty($body['nonce']);
+    }
+
+    public function testFailedLoginReturnsHtmlWhenJsonFalse(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'alice',
+                'token' => 'wrong-code',
+                'nonce' => $nonce,
+                'json'  => false,
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(401, $response->getStatusCode());
+        self::assertStringStartsWith('text/html', $response->headers->get('Content-Type'));
+        self::assertSelectorExists('form#preauth-form');
+    }
+
+    public function testFailedLoginWithSpentNonceIsRejected(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        // first: successful login consumes the nonce
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'alice',
+                'token' => $this->validTotpCode(),
+                'nonce' => $nonce,
+                'json'  => true,
+            ]),
+        ]);
+        self::assertSame(303, $client->getResponse()->getStatusCode());
+
+        // the successful login set a session cookie; clear it so the next
+        // request is not auto-authenticated by AcceptListener before the
+        // login attempt is even evaluated
+        $client->getCookieJar()->clear();
+
+        // reuse the same nonce — should fail even with a valid token
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'alice',
+                'token' => $this->validTotpCode(),
+                'nonce' => $nonce,
+                'json'  => true,
+            ]),
+        ]);
+        self::assertSame(401, $client->getResponse()->getStatusCode());
+    }
+
+    public function testFailedLoginWithInvalidNonceIsRejected(): void {
+        $client = static::createClient();
+
+        // skip fetching a real nonce; use one that was never stored
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'alice',
+                'token' => $this->validTotpCode(),
+                'nonce' => 'never-issued-nonce',
+                'json'  => true,
+            ]),
+        ]);
+
+        self::assertSame(401, $client->getResponse()->getStatusCode());
+    }
+
+    /* ── invalid payload ──────────────────────────────────────────────── */
+
+    public function testInvalidHeaderPayloadReturnsUnauthorized(): void {
+        $client = static::createClient();
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => '!!!not-valid-base64!!!',
+        ]);
+
+        // decode fails -> null payload -> failure path -> 401
+        self::assertSame(401, $client->getResponse()->getStatusCode());
+    }
+
+    public function testPayloadWithMissingFieldsReturnsUnauthorized(): void {
+        $client = static::createClient();
+
+        // payload missing token
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id' => 'alice', 'nonce' => 'some-nonce',
+            ]),
+        ]);
+
+        self::assertSame(401, $client->getResponse()->getStatusCode());
+    }
+
+    /* ── invalid cookie ───────────────────────────────────────────────── */
+
+    public function testInvalidCookieIsClearedAndLoginPageShown(): void {
+        $client = static::createClient();
+
+        // the cookie must be set via the CookieJar so that the HttpFoundation
+        // Request actually populates its cookies bag (HTTP_COOKIE alone is
+        // not parsed by Request::create)
+        $client->getCookieJar()->set(
+            new \Symfony\Component\BrowserKit\Cookie(
+                self::COOKIE_NAME, 'invalid-ulid-value',
+                null, '/', 'localhost', true, true, false, 'Strict',
+            )
+        );
+
+        $client->request('GET', 'https://localhost/');
+
+        $response = $client->getResponse();
+        // not authenticated -> login page with 401
+        self::assertSame(401, $response->getStatusCode());
+        // the stale cookie should be cleared
+        $cleared = false;
+        foreach ($response->headers->getCookies() as $cookie) {
+            if ($cookie->getName() === self::COOKIE_NAME && $cookie->isCleared()) {
+                $cleared = true;
+            }
+        }
+        self::assertTrue($cleared, 'Expected the invalid cookie to be cleared');
+    }
+
+    /* ── backup code authentication ───────────────────────────────────── */
+
+    public function testBackupCodeAuthenticationWorks(): void {
+        $client = static::createClient();
+        $container = $client->getContainer();
+
+        // generate a backup code via the BackupCodeManager
+        $manager = $container->get(\App\Service\BackupCodeInterface::class);
+        $codes = $manager->generate(1);
+        self::assertCount(1, $codes);
+
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id'    => 'frank',
+                'token' => $codes[0],
+                'nonce' => $nonce,
+                'json'  => true,
+            ]),
+        ]);
+
+        self::assertSame(303, $client->getResponse()->getStatusCode());
+    }
+
+    public function testConsumedBackupCodeCannotBeReused(): void {
+        $client = static::createClient();
+        $container = $client->getContainer();
+
+        $manager = $container->get(\App\Service\BackupCodeInterface::class);
+        $codes = $manager->generate(1);
+        $code = $codes[0];
+
+        // first use
+        $crawler = $client->request('GET', '/');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id' => 'frank', 'token' => $code, 'nonce' => $nonce, 'json' => true,
+            ]),
+        ]);
+        self::assertSame(303, $client->getResponse()->getStatusCode());
+
+        // the successful login set a session cookie; clear it so the next
+        // request reaches the login page instead of being auto-authenticated
+        $client->getCookieJar()->clear();
+
+        // second use with a fresh nonce
+        $crawler = $client->request('GET', '/');
+        $nonce2 = $crawler->filter('input[name="nonce"]')->attr('value');
+        $client->request('GET', '/', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id' => 'frank', 'token' => $code, 'nonce' => $nonce2, 'json' => true,
+            ]),
+        ]);
+        self::assertSame(401, $client->getResponse()->getStatusCode());
+    }
+
+    /* ── return URL handling ──────────────────────────────────────────── */
+
+    public function testSuccessfulLoginWithValidReturnUrl(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/?return=https://example.com/app');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/?return=https://example.com/app', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id' => 'alice', 'token' => $this->validTotpCode(),
+                'nonce' => $nonce, 'json' => true,
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(303, $response->getStatusCode());
+        self::assertSame('https://example.com/app', $response->headers->get('Location'));
+    }
+
+    public function testSuccessfulLoginWithInvalidReturnFallsBackToPath(): void {
+        $client = static::createClient();
+
+        $crawler = $client->request('GET', '/?return=not-a-url');
+        $nonce = $crawler->filter('input[name="nonce"]')->attr('value');
+
+        $client->request('GET', '/?return=not-a-url', [], [], [
+            'HTTP_X-Preauth' => $this->encodePayload([
+                'id' => 'alice', 'token' => $this->validTotpCode(),
+                'nonce' => $nonce, 'json' => true,
+            ]),
+        ]);
+
+        $response = $client->getResponse();
+        self::assertSame(303, $response->getStatusCode());
+        $location = $response->headers->get('Location');
+        // should fall back to the request path (with query string),
+        // not redirect to the invalid return URL as an absolute URL
+        self::assertStringStartsWith('/', $location);
+        // the invalid return URL is not used as the redirect target
+        self::assertStringNotContainsString('//not-a-url', $location);
+    }
+}

tests/Support/ListenerTestHelper.php

@@ -0,0 +1,111 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Support;
+
+use App\ConfigBag;
+use App\Service\DomainManager;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\RateLimiter\RateLimit;
+use Symfony\Component\RateLimiter\RateLimiterFactoryInterface;
+use Symfony\Component\RateLimiter\LimiterInterface;
+use Twig\Environment;
+use Twig\Loader\FilesystemLoader;
+
+/**
+ * Helpers for constructing the collaborators that the kernel listeners
+ * depend on, without booting the full Symfony container.
+ */
+trait ListenerTestHelper {
+    use TotpTestHelper;
+
+    /** Build a Twig Environment pointed at the project's real templates. */
+    private function makeTwig(): Environment {
+        $loader = new FilesystemLoader(dirname(__DIR__, 2) . '/templates');
+        $twig = new Environment($loader, ['strict_variables' => true]);
+        // the templates reference a global `env` object; supply one with the
+        // keys used by base/login/error/_script/_style
+        $twig->addGlobal('env', (object)[
+            'title'            => 'Pre-Authentication System',
+            'bg_color'         => '#029386',
+            'fg_color'         => '#ffffff',
+            'error_color'      => '#ffb16d',
+            'id_name'          => 'Session ID',
+            'token_name'       => 'Authentication Token',
+            'submit_name'      => 'Submit',
+            'error_message'    => 'Unsuccessful login attempt',
+            'teapot'           => true,
+            'teapot_title'     => "I'm a teapot",
+            'teapot_message'   => 'I refuse to brew coffee',
+            'too_many_title'   => 'Too many requests',
+            'too_many_message' => 'Try again later',
+            'debug'            => 0,
+        ]);
+        return $twig;
+    }
+
+    /**
+     * A RateLimiterFactoryInterface whose created limiter returns a RateLimit
+     * with the given remaining tokens.
+     */
+    private function makeRateLimiterFactory(int $remainingTokens): RateLimiterFactoryInterface {
+        $limiter = $this->makeLimiter($remainingTokens);
+        return new class($limiter) implements RateLimiterFactoryInterface {
+            public function __construct(private LimiterInterface $limiter) {}
+            public function create(?string $key = null): LimiterInterface {
+                return $this->limiter;
+            }
+        };
+    }
+
+    private function makeLimiter(int $remainingTokens): LimiterInterface {
+        $rateLimit = new RateLimit(
+            $remainingTokens,
+            new \DateTimeImmutable('+10 seconds'),
+            $remainingTokens > 0,
+            10,
+        );
+        return new class($rateLimit) implements LimiterInterface {
+            public function __construct(private RateLimit $rateLimit) {}
+            public function reserve(int $tokens = 1, ?float $maxTime = null): \Symfony\Component\RateLimiter\Reservation {
+                throw new \Symfony\Component\RateLimiter\Exception\ReserveNotSupportedException();
+            }
+            public function consume(int $tokens = 1): RateLimit {
+                return $this->rateLimit;
+            }
+            public function reset(): void {}
+        };
+    }
+
+    /**
+     * A factory whose limiter tracks how many consume(1) calls were made and
+     * reports the limit as reached only after $threshold failures.
+     */
+    private function makeCountingRateLimiterFactory(int $threshold): RateLimiterFactoryInterface {
+        $limiter = new class($threshold) implements LimiterInterface {
+            private int $consumed = 0;
+            public function __construct(private int $threshold) {}
+            public function reserve(int $tokens = 1, ?float $maxTime = null): \Symfony\Component\RateLimiter\Reservation {
+                throw new \Symfony\Component\RateLimiter\Exception\ReserveNotSupportedException();
+            }
+            public function consume(int $tokens = 1): RateLimit {
+                $this->consumed += $tokens;
+                $remaining = max(0, $this->threshold - $this->consumed);
+                return new RateLimit(
+                    $remaining,
+                    new \DateTimeImmutable('+10 seconds'),
+                    $remaining > 0,
+                    $this->threshold,
+                );
+            }
+            public function reset(): void { $this->consumed = 0; }
+        };
+        return new class($limiter) implements RateLimiterFactoryInterface {
+            public function __construct(private LimiterInterface $limiter) {}
+            public function create(?string $key = null): LimiterInterface {
+                return $this->limiter;
+            }
+        };
+    }
+}

tests/Support/TotpTestHelper.php

@@ -0,0 +1,89 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Support;
+
+use App\ConfigBag;
+use App\Utilities;
+use DateTimeImmutable;
+use OTPHP\TOTP;
+use PHPUnit\Framework\TestCase;
+use Psr\Cache\CacheItemInterface;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Clock\ClockInterface as PsrClockInterface;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+
+/**
+ * Provides a deterministic TOTP fixture plus a frozen clock and ready-made
+ * ConfigBag / cache-pool helpers for tests that exercise TOTP-dependent code.
+ */
+trait TotpTestHelper {
+    /** well-known Base32 test secret (JBSWY3DPEHPK3PXP) */
+    private const string TOTP_SECRET = 'JBSWY3DPEHPK3PXP';
+
+    /** Frozen timestamp used for deterministic TOTP codes. */
+    protected const string FROZEN_TIME = '2025-06-15 12:00:00';
+
+    /** Frozen clock that always returns the same instant. */
+    private function frozenClock(): PsrClockInterface {
+        $time = self::FROZEN_TIME;
+        return new class($time) implements PsrClockInterface {
+            public function __construct(private string $time) {}
+            public function now(): DateTimeImmutable {
+                return new DateTimeImmutable($this->time);
+            }
+        };
+    }
+
+    /** Provisioning URI built from the well-known secret + frozen clock. */
+    private function totpUri(): string {
+        $totp = TOTP::createFromSecret(self::TOTP_SECRET, $this->frozenClock());
+        $totp->setLabel('Test-TOTP');
+        return $totp->getProvisioningUri();
+    }
+
+    /** The TOTP code that is valid at the frozen timestamp. */
+    private function validTotpCode(): string {
+        return TOTP::createFromSecret(self::TOTP_SECRET, $this->frozenClock())->now();
+    }
+
+    /** A fresh in-memory cache pool suitable for wrapping in MonitorCacheKeys. */
+    private function emptyPool(): CacheItemPoolInterface {
+        return new ArrayAdapter();
+    }
+
+    /**
+     * Build a ConfigBag wired with the deterministic TOTP and frozen clock.
+     * Extra params override the sensible defaults.
+     */
+    private function makeConfig(
+        ?int $cookieTtl = 3600,
+        ?int $ipTtl = 0,
+        bool $teapot = true,
+        string $errorMessage = 'Error',
+        string $teapotTitle = 'Teapot',
+        string $tooManyTitle = 'Too Many',
+    ): ConfigBag {
+        $clock = $this->frozenClock();
+        $utilities = $this->createUtilities($clock);
+        return new ConfigBag(
+            $utilities, $clock,
+            $cookieTtl, $this->totpUri(), $ipTtl, $teapot,
+            $errorMessage, $teapotTitle, $tooManyTitle,
+        );
+    }
+
+    /**
+     * Minimal Utilities stub that never triggers TOTP generation when
+     * a non-empty totpUri is supplied to ConfigBag.
+     */
+    private function createUtilities(?PsrClockInterface $clock = null): Utilities {
+        $clock ??= $this->frozenClock();
+        $cache = $this->createStub(CacheItemPoolInterface::class);
+        $cache->method('hasItem')->willReturn(false);
+        $item = $this->createStub(CacheItemInterface::class);
+        $item->method('isHit')->willReturn(false);
+        $cache->method('getItem')->willReturn($item);
+        return new Utilities($clock, $cache);
+    }
+}

tests/TestKernel.php

@@ -0,0 +1,41 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests;
+
+use App\Kernel as AppKernel;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Kernel used by the functional test suite.
+ *
+ * In production the nonce cache is backed by APCu, which naturally persists
+ * across PHP requests.  In the test environment the nonce cache is an
+ * in-memory ArrayAdapter; Symfony's ServicesResetter clears it between
+ * requests (even with KernelBrowser::disableReboot()), which would discard
+ * the nonce issued on the login-page request before the login-submission
+ * request can verify it.
+ *
+ * This kernel removes the kernel.reset tag from the nonceCache (and
+ * rateLimitCache) pools so their in-memory state survives across requests
+ * within a single test, mirroring the persistence behaviour of APCu.
+ */
+class TestKernel extends AppKernel
+{
+    protected function build(ContainerBuilder $container): void
+    {
+        parent::build($container);
+
+        $container->addCompilerPass(new class implements CompilerPassInterface {
+            public function process(ContainerBuilder $container): void
+            {
+                foreach (['nonceCache', 'rateLimitCache', 'sessionCache', 'sessionStorage'] as $poolId) {
+                    if ($container->hasDefinition($poolId)) {
+                        $container->getDefinition($poolId)->clearTag('kernel.reset');
+                    }
+                }
+            }
+        });
+    }
+}

tests/Unit/ClockTest.php

@@ -0,0 +1,20 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit;
+
+use App\Clock;
+use PHPUnit\Framework\TestCase;
+
+final class ClockTest extends TestCase {
+    public function testNowReturnsDateTimeImmutable(): void {
+        $clock = new Clock();
+        $before = new \DateTimeImmutable();
+        $now = $clock->now();
+        $after = new \DateTimeImmutable();
+
+        self::assertInstanceOf(\DateTimeImmutable::class, $now);
+        self::assertGreaterThanOrEqual($before->getTimestamp(), $now->getTimestamp());
+        self::assertLessThanOrEqual($after->getTimestamp(), $now->getTimestamp());
+    }
+}

tests/Unit/Command/GenerateBackupCodesCommandTest.php

@@ -0,0 +1,120 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Command;
+
+use App\Command\GenerateBackupCodesCommand;
+use App\PersistCache;
+use App\Service\BackupCodeInterface;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\Console\Tester\CommandTester;
+
+final class GenerateBackupCodesCommandTest extends TestCase {
+
+    /** PersistCache is final, so construct a real one backed by ArrayAdapters. */
+    private function makePersistCache(): PersistCache {
+        return new PersistCache(new ArrayAdapter(), new ArrayAdapter());
+    }
+
+    /** A stub BackupCodeInterface that returns the given codes from generate(). */
+    private function makeManagerStub(array $generatedCodes): BackupCodeInterface {
+        $manager = $this->createStub(BackupCodeInterface::class);
+        $manager->method('generate')->willReturn($generatedCodes);
+        return $manager;
+    }
+
+    public function testGenerateDefaultCountOutputsCodes(): void {
+        $codes = ['abc123', 'def456', 'ghi789', 'jkl012', 'mno345',
+                  'pqr678', 'stu901', 'vwx234', 'yzA567', 'bCd890'];
+        $command = new GenerateBackupCodesCommand(
+            $this->makeManagerStub($codes), $this->makePersistCache()
+        );
+        $command->setName('app:generate-backup-codes');
+
+        $tester = new CommandTester($command);
+        $exit = $tester->execute([]);
+
+        self::assertSame(0, $exit);
+        $output = $tester->getDisplay();
+        foreach ($codes as $code) {
+            self::assertStringContainsString($code, $output);
+        }
+    }
+
+    public function testGenerateSpecificCountPassesCountToManager(): void {
+        $manager = $this->createMock(BackupCodeInterface::class);
+        $manager->expects(self::once())
+            ->method('generate')
+            ->with(self::identicalTo(5))
+            ->willReturn(['c1', 'c2', 'c3', 'c4', 'c5']);
+
+        $command = new GenerateBackupCodesCommand($manager, $this->makePersistCache());
+        $command->setName('app:generate-backup-codes');
+
+        $tester = new CommandTester($command);
+        $exit = $tester->execute(['count' => 5]);
+
+        self::assertSame(0, $exit);
+    }
+
+    public function testDefaultCountArgumentIsTen(): void {
+        // the configured default for the count argument should be 10
+        $manager = $this->createMock(BackupCodeInterface::class);
+        $manager->expects(self::once())
+            ->method('generate')
+            ->with(self::identicalTo(10))
+            ->willReturn(array_fill(0, 10, 'code'));
+
+        $command = new GenerateBackupCodesCommand($manager, $this->makePersistCache());
+        $command->setName('app:generate-backup-codes');
+
+        $tester = new CommandTester($command);
+        $tester->execute([]);
+
+        // assertion is in the mock expectation above
+        $this->addToAssertionCount(1);
+    }
+
+    public function testBootsAndPersistsCache(): void {
+        // PersistCache is final and can't be mocked, but we can verify the
+        // command runs end-to-end with a real instance; boot()/persist()
+        // are invoked implicitly. A successful exit confirms both were called
+        // without throwing.
+        $command = new GenerateBackupCodesCommand(
+            $this->makeManagerStub(['code1']), $this->makePersistCache()
+        );
+        $command->setName('app:generate-backup-codes');
+
+        $tester = new CommandTester($command);
+        $exit = $tester->execute([]);
+
+        self::assertSame(0, $exit);
+    }
+
+    public function testZeroCodesOutputsNothing(): void {
+        $command = new GenerateBackupCodesCommand(
+            $this->makeManagerStub([]), $this->makePersistCache()
+        );
+        $command->setName('app:generate-backup-codes');
+
+        $tester = new CommandTester($command);
+        $exit = $tester->execute(['count' => 0]);
+
+        self::assertSame(0, $exit);
+        self::assertSame('', trim($tester->getDisplay()));
+    }
+
+    public function testCommandNameAndDescriptionAreConfigured(): void {
+        $command = new GenerateBackupCodesCommand(
+            $this->makeManagerStub([]), $this->makePersistCache()
+        );
+        // configuring via the Application runs the protected configure()
+        $app = new \Symfony\Component\Console\Application();
+        $app->addCommand($command);
+        self::assertSame('app:generate-backup-codes', $command->getName());
+        // the source uses a non-breaking hyphen (U+2011) in "single‑use",
+        // so assert against the substring to avoid encoding fragility
+        self::assertStringContainsString('backup codes', $command->getDescription());
+    }
+}

tests/Unit/ConfigBagTest.php

@@ -0,0 +1,90 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit;
+
+use App\ConfigBag;
+use App\Utilities;
+use PHPUnit\Framework\TestCase;
+use Psr\Cache\CacheItemInterface;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Clock\ClockInterface;
+
+final class ConfigBagTest extends TestCase {
+    private function createUtilities(?string $totp = null): Utilities {
+        $clock = $this->createStub(ClockInterface::class);
+        $cache = $this->createStub(CacheItemPoolInterface::class);
+
+        if ($totp !== null) {
+            $item = $this->createStub(CacheItemInterface::class);
+            $item->method('isHit')->willReturn(true);
+            $item->method('get')->willReturn($totp);
+            $cache->method('hasItem')->willReturn(true);
+            $cache->method('getItem')->willReturn($item);
+        } else {
+            $cache->method('hasItem')->willReturn(false);
+        }
+
+        return new Utilities($clock, $cache);
+    }
+
+    public function testGettersWithExplicitValues(): void {
+        $clock = $this->createStub(ClockInterface::class);
+        $utilities = $this->createUtilities();
+
+        $config = new ConfigBag(
+            $utilities, $clock,
+            3600, 'otpauth://totp/test', 1800, true,
+            'Error!', 'Teapot!', 'Too Many!'
+        );
+
+        self::assertSame($clock, $config->clock());
+        self::assertSame(3600, $config->cookieTtl());
+        self::assertSame('otpauth://totp/test', $config->totpUri());
+        self::assertSame(1800, $config->ipTtl());
+        self::assertTrue($config->teapot());
+        self::assertSame('Error!', $config->errorMessage());
+        self::assertSame('Teapot!', $config->teapotTitle());
+        self::assertSame('Too Many!', $config->tooManyTitle());
+    }
+
+    public function testTotpUriFallsBackToUtilitiesWhenEmpty(): void {
+        $clock = $this->createStub(ClockInterface::class);
+        $utilities = $this->createUtilities('fallback-totp');
+
+        $config = new ConfigBag(
+            $utilities, $clock,
+            3600, '', 1800, false,
+            'Error', 'Teapot', 'Too Many'
+        );
+
+        self::assertSame('fallback-totp', $config->totpUri());
+    }
+
+    public function testIpTtlFallsBackToNullWhenZero(): void {
+        $clock = $this->createStub(ClockInterface::class);
+        $utilities = $this->createUtilities();
+
+        $config = new ConfigBag(
+            $utilities, $clock,
+            3600, 'otpauth://totp/test', 0, false,
+            'Error', 'Teapot', 'Too Many'
+        );
+
+        self::assertNull($config->ipTtl());
+    }
+
+    public function testIpTtlFallsBackToNullWhenNull(): void {
+        $clock = $this->createStub(ClockInterface::class);
+        $utilities = $this->createUtilities();
+
+        $config = new ConfigBag(
+            $utilities, $clock,
+            3600, 'otpauth://totp/test', null, false,
+            'Error', 'Teapot', 'Too Many'
+        );
+
+        self::assertNull($config->ipTtl());
+    }
+}
+

tests/Unit/Data/PayloadTest.php

@@ -0,0 +1,195 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Data;
+
+use App\Data\Payload;
+use App\Enum\Scope;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\InputBag;
+
+final class PayloadTest extends TestCase {
+    private static function b64u(string $data): string {
+        return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
+    }
+
+    public function testDecodeValidBase64Url(): void {
+        $data = json_encode([
+            'id' => 'testuser', 'token' => '123456', 'nonce' => 'abc123',
+            'json' => true, 'scope' => 'cookie',
+        ]);
+        $payload = Payload::decode(self::b64u($data));
+
+        self::assertInstanceOf(Payload::class, $payload);
+        self::assertSame('testuser', $payload->id);
+        self::assertSame('123456', $payload->token);
+        self::assertSame('abc123', $payload->nonce);
+        self::assertTrue($payload->json);
+        self::assertSame(Scope::Cookie, $payload->scope);
+    }
+
+    public function testDecodeInvalidBase64UrlReturnsNull(): void {
+        self::assertNull(Payload::decode('!!!not-valid-base64!!!'));
+    }
+
+    public function testDecodeNonObjectJsonReturnsNull(): void {
+        self::assertNull(Payload::decode(self::b64u('"just a string"')));
+    }
+
+    public function testDecodeInvalidJsonReturnsNull(): void {
+        // valid base64url but invalid JSON
+        self::assertNull(Payload::decode(self::b64u('{invalid json')));
+    }
+
+    public function testDecodeJsonArrayReturnsNull(): void {
+        self::assertNull(Payload::decode(self::b64u('[1,2,3]')));
+    }
+
+    public function testDecodeJsonNullReturnsNull(): void {
+        self::assertNull(Payload::decode(self::b64u('null')));
+    }
+
+    public function testDecodeJsonBooleanReturnsNull(): void {
+        self::assertNull(Payload::decode(self::b64u('true')));
+        self::assertNull(Payload::decode(self::b64u('false')));
+    }
+
+    public function testDecodeJsonNumberReturnsNull(): void {
+        self::assertNull(Payload::decode(self::b64u('42')));
+    }
+
+    public function testDecodeEmptyStringReturnsNull(): void {
+        self::assertNull(Payload::decode(''));
+    }
+
+    public function testLoadWithValidInputBag(): void {
+        $input = new InputBag([
+            'username' => 'alice', 'nonce' => 'nonce123', 'totp' => '654321',
+        ]);
+        $payload = Payload::load($input);
+
+        self::assertInstanceOf(Payload::class, $payload);
+        self::assertSame('alice', $payload->id);
+        self::assertSame('nonce123', $payload->nonce);
+        self::assertSame('654321', $payload->token);
+        self::assertFalse($payload->json);
+        self::assertSame(Scope::Cookie, $payload->scope);
+    }
+
+    public function testLoadMissingUsernameReturnsNull(): void {
+        $input = new InputBag(['nonce' => 'n', 'totp' => 't']);
+        self::assertNull(Payload::load($input));
+    }
+
+    public function testLoadMissingNonceReturnsNull(): void {
+        $input = new InputBag(['username' => 'u', 'totp' => 't']);
+        self::assertNull(Payload::load($input));
+    }
+
+    public function testLoadMissingTotpReturnsNull(): void {
+        $input = new InputBag(['username' => 'u', 'nonce' => 'n']);
+        self::assertNull(Payload::load($input));
+    }
+
+    public function testLoadWithAllFieldsPresentButEmptyReturnsNull(): void {
+        // has() returns true for all, but create() rejects empty values
+        $input = new InputBag(['username' => '', 'nonce' => '', 'totp' => '']);
+        self::assertNull(Payload::load($input));
+    }
+
+    public function testCreateWithValidData(): void {
+        $data = (object)[
+            'id' => 'user1', 'token' => 'tok1', 'nonce' => 'non1',
+            'json' => false, 'scope' => 'ip',
+        ];
+        $payload = Payload::create($data);
+
+        self::assertInstanceOf(Payload::class, $payload);
+        self::assertSame('user1', $payload->id);
+        self::assertSame('tok1', $payload->token);
+        self::assertSame('non1', $payload->nonce);
+        self::assertFalse($payload->json);
+        self::assertSame(Scope::Ip, $payload->scope);
+    }
+
+    public function testCreateWithDefaultScope(): void {
+        $data = (object)['id' => 'user1', 'token' => 'tok1', 'nonce' => 'non1'];
+        $payload = Payload::create($data);
+        self::assertSame(Scope::Cookie, $payload->scope);
+    }
+
+    public function testCreateWithInvalidScopeFallsBackToCookie(): void {
+        $data = (object)[
+            'id' => 'user1', 'token' => 'tok1', 'nonce' => 'non1',
+            'scope' => 'admin',
+        ];
+        $payload = Payload::create($data);
+        self::assertSame(Scope::Cookie, $payload->scope);
+    }
+
+    public function testCreateWithMissingJsonDefaultsToTrue(): void {
+        $data = (object)['id' => 'user1', 'token' => 'tok1', 'nonce' => 'non1'];
+        $payload = Payload::create($data);
+        self::assertTrue($payload->json);
+    }
+
+    public function testCreateWithNoneScopeSetsJsonFalse(): void {
+        $data = (object)[
+            'id' => 'user1', 'token' => 'tok1', 'nonce' => 'non1',
+            'json' => true, 'scope' => 'none',
+        ];
+        $payload = Payload::create($data);
+        self::assertSame(Scope::None, $payload->scope);
+        self::assertFalse($payload->json);
+    }
+
+    public function testCreateWithEmptyIdReturnsNull(): void {
+        $data = (object)['id' => '', 'token' => 't', 'nonce' => 'n'];
+        self::assertNull(Payload::create($data));
+    }
+
+    public function testCreateWithWhitespaceIdReturnsNull(): void {
+        $data = (object)['id' => '   ', 'token' => 't', 'nonce' => 'n'];
+        self::assertNull(Payload::create($data));
+    }
+
+    public function testCreateWithEmptyTokenReturnsNull(): void {
+        $data = (object)['id' => 'u', 'token' => '', 'nonce' => 'n'];
+        self::assertNull(Payload::create($data));
+    }
+
+    public function testCreateWithEmptyNonceReturnsNull(): void {
+        $data = (object)['id' => 'u', 'token' => 't', 'nonce' => ''];
+        self::assertNull(Payload::create($data));
+    }
+
+    public function testCreateTrimsAndTruncatesFields(): void {
+        $long = str_repeat('a', 200);
+        $data = (object)[
+            'id' => '  ' . $long . '  ',
+            'token' => '  ' . $long . '  ',
+            'nonce' => '  ' . $long . '  ',
+        ];
+        $payload = Payload::create($data);
+        $expected = mb_substr($long, 0, 128);
+        self::assertSame($expected, $payload->id);
+        self::assertSame($expected, $payload->token);
+        self::assertSame($expected, $payload->nonce);
+    }
+
+    public function testToString(): void {
+        $payload = new Payload();
+        $payload->id = 'u';
+        $payload->token = 't';
+        $payload->nonce = 'n';
+        $payload->json = true;
+        $payload->scope = Scope::Cookie;
+
+        $decoded = json_decode($payload->toString(), true);
+        self::assertSame('u', $decoded['id']);
+        self::assertSame('t', $decoded['token']);
+        self::assertSame('n', $decoded['nonce']);
+        self::assertTrue($decoded['json']);
+        self::assertSame('cookie', $decoded['scope']);
+    }
+}

tests/Unit/Enum/ScopeTest.php

@@ -0,0 +1,26 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Enum;
+
+use App\Enum\Scope;
+use PHPUnit\Framework\TestCase;
+
+final class ScopeTest extends TestCase {
+    public function testCases(): void {
+        self::assertSame('cookie', Scope::Cookie->value);
+        self::assertSame('ip', Scope::Ip->value);
+        self::assertSame('none', Scope::None->value);
+    }
+
+    public function testTryFromValid(): void {
+        self::assertSame(Scope::Cookie, Scope::tryFrom('cookie'));
+        self::assertSame(Scope::Ip, Scope::tryFrom('ip'));
+        self::assertSame(Scope::None, Scope::tryFrom('none'));
+    }
+
+    public function testTryFromInvalid(): void {
+        self::assertNull(Scope::tryFrom('invalid'));
+        self::assertNull(Scope::tryFrom(''));
+    }
+}

tests/Unit/Listener/AcceptListenerTest.php

@@ -0,0 +1,124 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Listener;
+
+use App\Listener\AcceptListener;
+use App\Service\DomainManager;
+use App\Tests\Support\TotpTestHelper;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+final class AcceptListenerTest extends TestCase {
+    use TotpTestHelper;
+
+    private const string COOKIE_NAME = '__Host-Http-Preauth';
+    private const string AUTH_COOKIE_NAME = '__Http-Domain-Preauth';
+
+    private function makeListener(ArrayAdapter $pool, DomainManager $domainManager): AcceptListener {
+        $listener = new AcceptListener($pool, $domainManager);
+        $listener->setLogger(new NullLogger());
+        return $listener;
+    }
+
+    private function makeEvent(Request $request): RequestEvent {
+        return new RequestEvent(
+            $this->createStub(\Symfony\Component\HttpKernel\HttpKernelInterface::class),
+            $request,
+            HttpKernelInterface::MAIN_REQUEST,
+        );
+    }
+
+    /* ── valid cookie session ─────────────────────────────────────────── */
+
+    public function testValidCookieSetsResponseWithRemoteUser(): void {
+        $pool = new ArrayAdapter();
+        $ulid = '01HXY1234567890ABCDEFGHIJK';
+        $item = $pool->getItem('cookie_' . $ulid);
+        $item->set('alice');
+        $pool->save($item);
+
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($pool, $domainManager);
+
+        $request = Request::create('/', 'GET');
+        $request->cookies->set(self::COOKIE_NAME, $ulid);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertSame(200, $response->getStatusCode());
+        self::assertSame('alice', $response->headers->get('Remote-User'));
+        self::assertSame('text/plain', $response->headers->get('Content-Type'));
+    }
+
+    public function testValidCookieUsesAuthCookieNameWhenUsingCentralAuth(): void {
+        $pool = new ArrayAdapter();
+        $ulid = '01HXY1234567890ABCDEFGHIJK';
+        $item = $pool->getItem('cookie_' . $ulid);
+        $item->set('bob');
+        $pool->save($item);
+
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener($pool, $domainManager);
+
+        $request = Request::create('/', 'GET');
+        $request->cookies->set(self::AUTH_COOKIE_NAME, $ulid);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        self::assertSame('bob', $event->getResponse()->headers->get('Remote-User'));
+    }
+
+    /* ── negative cases ───────────────────────────────────────────────── */
+
+    public function testNoCookieSetsNoResponse(): void {
+        $pool = new ArrayAdapter();
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($pool, $domainManager);
+
+        $event = $this->makeEvent(Request::create('/', 'GET'));
+        $listener->onKernelRequest($event);
+
+        self::assertFalse($event->hasResponse());
+    }
+
+    public function testCookieWithoutSessionSetsNoResponse(): void {
+        $pool = new ArrayAdapter();
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($pool, $domainManager);
+
+        $request = Request::create('/', 'GET');
+        $request->cookies->set(self::COOKIE_NAME, 'unknown-ulid');
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertFalse($event->hasResponse());
+    }
+
+    public function testEmptyCookieValueSetsNoResponse(): void {
+        $pool = new ArrayAdapter();
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($pool, $domainManager);
+
+        // cookies->set with empty string
+        $request = Request::create('/', 'GET');
+        $request->cookies->set(self::COOKIE_NAME, '');
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        // empty cookie value should not be treated as a valid session
+        self::assertFalse($event->hasResponse());
+    }
+}

tests/Unit/Listener/AllowListenerTest.php

@@ -0,0 +1,95 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Listener;
+
+use App\ConfigBag;
+use App\Listener\AllowListener;
+use App\Tests\Support\TotpTestHelper;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+final class AllowListenerTest extends TestCase {
+    use TotpTestHelper;
+
+    private function makeListener(ArrayAdapter $pool, ConfigBag $config): AllowListener {
+        $listener = new AllowListener($pool, $config);
+        $listener->setLogger(new NullLogger());
+        return $listener;
+    }
+
+    private function makeEvent(Request $request): RequestEvent {
+        return new RequestEvent(
+            $this->createStub(HttpKernelInterface::class),
+            $request,
+            HttpKernelInterface::MAIN_REQUEST,
+        );
+    }
+
+    public function testValidIpSessionSetsResponseWithRemoteUser(): void {
+        $pool = new ArrayAdapter();
+        $item = $pool->getItem('ip_1.2.3.4');
+        $item->set('carol');
+        $pool->save($item);
+
+        $config = $this->makeConfig(ipTtl: 1800);
+        $listener = $this->makeListener($pool, $config);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertSame(200, $response->getStatusCode());
+        self::assertSame('carol', $response->headers->get('Remote-User'));
+        self::assertSame('text/plain', $response->headers->get('Content-Type'));
+    }
+
+    public function testNoIpSessionSetsNoResponse(): void {
+        $pool = new ArrayAdapter();
+        $config = $this->makeConfig(ipTtl: 1800);
+        $listener = $this->makeListener($pool, $config);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '9.9.9.9']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertFalse($event->hasResponse());
+    }
+
+    public function testIpAccessDisabledSetsNoResponse(): void {
+        $pool = new ArrayAdapter();
+        // even though there's a stored session, ip access is disabled
+        $item = $pool->getItem('ip_1.2.3.4');
+        $item->set('carol');
+        $pool->save($item);
+
+        $config = $this->makeConfig(ipTtl: 0);
+        $listener = $this->makeListener($pool, $config);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertFalse($event->hasResponse());
+    }
+
+    public function testIpAccessDisabledDoesNotCheckCache(): void {
+        $pool = new ArrayAdapter();
+        $config = $this->makeConfig(ipTtl: 0);
+        $listener = $this->makeListener($pool, $config);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        // when disabled, nothing should have been written/read as a session
+        self::assertFalse($event->hasResponse());
+        self::assertFalse($pool->hasItem('ip_1.2.3.4'));
+    }
+}

tests/Unit/Listener/InterceptListenerTest.php

@@ -0,0 +1,206 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Listener;
+
+use App\Listener\InterceptListener;
+use App\Service\DomainManager;
+use App\Tests\Support\ListenerTestHelper;
+use PHPUnit\Framework\TestCase;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\HttpFoundation\Cookie;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+final class InterceptListenerTest extends TestCase {
+    use ListenerTestHelper;
+
+    private const string COOKIE_NAME = '__Host-Http-Preauth';
+    private const string AUTH_COOKIE_NAME = '__Http-Domain-Preauth';
+
+    private function makeListener(
+        DomainManager $domainManager,
+        ?CacheItemPoolInterface $nonceCache = null,
+    ): InterceptListener {
+        $listener = new InterceptListener(
+            $this->makeConfig(),
+            $domainManager,
+            $this->makeTwig(),
+        );
+        $listener->setLogger(new NullLogger());
+        $listener->setNonceCache($nonceCache ?? new ArrayAdapter());
+        return $listener;
+    }
+
+    private function makeEvent(Request $request): RequestEvent {
+        return new RequestEvent(
+            $this->createStub(HttpKernelInterface::class),
+            $request,
+            HttpKernelInterface::MAIN_REQUEST,
+        );
+    }
+
+    /* ── central-auth redirect branch ─────────────────────────────────── */
+
+    public function testRedirectsToAuthSubdomainWhenHostMatchesBaseDomain(): void {
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener($domainManager);
+
+        $request = Request::create('https://app.example.com/dashboard', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_SEE_OTHER, $response->getStatusCode());
+        $location = $response->headers->get('Location');
+        self::assertStringStartsWith('https://auth.example.com/?', $location);
+        // the return query should contain the original url
+        self::assertStringContainsString('return=', $location);
+        self::assertStringContainsString(urlencode('https://app.example.com/dashboard'), $location);
+    }
+
+    public function testDoesNotRedirectWhenAlreadyOnAuthSubdomain(): void {
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener($domainManager);
+
+        $request = Request::create('https://auth.example.com/', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        // should render login page, not redirect
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertNotSame(Response::HTTP_SEE_OTHER, $response->getStatusCode());
+        self::assertSame(Response::HTTP_UNAUTHORIZED, $response->getStatusCode());
+    }
+
+    /* ── login page rendering branch ──────────────────────────────────── */
+
+    public function testPresentsLoginPageWithUnauthorizedStatus(): void {
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($domainManager);
+
+        $request = Request::create('https://example.com/', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_UNAUTHORIZED, $response->getStatusCode());
+        self::assertSame('text/html', $response->headers->get('Content-Type'));
+        $content = $response->getContent();
+        self::assertStringContainsString('<form', $content);
+        // the rendered page should embed a freshly generated nonce
+        self::assertStringContainsString('name="nonce"', $content);
+    }
+
+    public function testGeneratedNonceIsStoredInCache(): void {
+        $nonceCache = new ArrayAdapter();
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($domainManager, $nonceCache);
+
+        $request = Request::create('https://example.com/', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        // exactly one nonce should now exist in the cache, marked valid
+        $found = false;
+        foreach ($nonceCache->getValues() as $key => $value) {
+            if (str_starts_with($key, 'test_') || preg_match('/^[A-Za-z0-9_.]+$/', $key)) {
+                $found = true;
+            }
+        }
+        // ArrayAdapter stores raw values; verify at least one item was saved
+        self::assertTrue(count($nonceCache->getValues()) > 0);
+    }
+
+    public function testLoginTemplateUsesPostFormWhenOnAuthSubdomain(): void {
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener($domainManager);
+
+        $request = Request::create('https://auth.example.com/', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $content = $event->getResponse()->getContent();
+        // when on the auth subdomain, post=true so the form has method="post"
+        self::assertStringContainsString('method="post"', $content);
+    }
+
+    public function testLoginTemplateDoesNotUsePostFormWhenNotOnAuthSubdomain(): void {
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($domainManager);
+
+        $request = Request::create('https://example.com/', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $content = $event->getResponse()->getContent();
+        // not on auth subdomain, so the form should NOT have method="post"
+        self::assertStringNotContainsString('method="post"', $content);
+    }
+
+    /* ── invalid cookie pruning ───────────────────────────────────────── */
+
+    public function testInvalidCookieIsClearedWhenPresent(): void {
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($domainManager);
+
+        $request = Request::create('https://example.com/', 'GET');
+        // send a cookie that won't match any session (so AcceptListener didn't fire)
+        $request->cookies->set(self::COOKIE_NAME, 'stale-ulid');
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        // a Clear-Site-Data style clearCookie should produce a Set-Cookie that expires it
+        $cookies = $response->headers->getCookies();
+        $cleared = false;
+        foreach ($cookies as $cookie) {
+            if ($cookie->getName() === self::COOKIE_NAME && $cookie->isCleared()) {
+                $cleared = true;
+            }
+        }
+        self::assertTrue($cleared, 'Expected the invalid cookie to be cleared');
+    }
+
+    public function testNoCookieClearingWhenNoCookiePresent(): void {
+        $domainManager = new DomainManager(false, '');
+        $listener = $this->makeListener($domainManager);
+
+        $request = Request::create('https://example.com/', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $response = $event->getResponse();
+        self::assertSame([], $response->headers->getCookies());
+    }
+
+    public function testInvalidCookieUsesAuthCookieNameWithCentralAuth(): void {
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener($domainManager);
+
+        // request to auth subdomain with a stale auth-domain cookie
+        $request = Request::create('https://auth.example.com/', 'GET');
+        $request->cookies->set(self::AUTH_COOKIE_NAME, 'stale-ulid');
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $response = $event->getResponse();
+        $cleared = false;
+        foreach ($response->headers->getCookies() as $cookie) {
+            if ($cookie->getName() === self::AUTH_COOKIE_NAME && $cookie->isCleared()) {
+                $cleared = true;
+            }
+        }
+        self::assertTrue($cleared, 'Expected the auth cookie to be cleared');
+    }
+}

tests/Unit/Listener/LoginListenerTest.php

@@ -0,0 +1,295 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Listener;
+
+use App\Data\Payload;
+use App\Enum\Scope;
+use App\Listener\LoginListener;
+use App\Service\DomainManager;
+use App\Service\LoginInterface;
+use App\Tests\Support\ListenerTestHelper;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+final class LoginListenerTest extends TestCase {
+    use ListenerTestHelper;
+
+    private const string HEADER_NAME = 'X-Preauth';
+
+    private function makeListener(
+        ?LoginInterface $loginManager = null,
+        ?DomainManager $domainManager = null,
+        ?int $rateLimitRemaining = 5,
+    ): LoginListener {
+        $listener = new LoginListener(
+            $this->makeTwig(),
+            $this->makeRateLimiterFactory($rateLimitRemaining ?? 5),
+            $domainManager ?? new DomainManager(false, ''),
+            $loginManager ?? $this->createStub(LoginInterface::class),
+            $this->makeConfig(),
+        );
+        $listener->setLogger(new NullLogger());
+        $listener->setNonceCache(new ArrayAdapter());
+        return $listener;
+    }
+
+    private function makeEvent(Request $request): RequestEvent {
+        return new RequestEvent(
+            $this->createStub(HttpKernelInterface::class),
+            $request,
+            HttpKernelInterface::MAIN_REQUEST,
+        );
+    }
+
+    /** Build a base64url-encoded X-Preauth header value for a payload. */
+    private function encodePayload(array $data): string {
+        $json = json_encode($data, JSON_THROW_ON_ERROR);
+        return rtrim(strtr(base64_encode($json), '+/', '-_'), '=');
+    }
+
+    /* ── no login attempt ─────────────────────────────────────────────── */
+
+    public function testNoHeaderAndNoPostReturnsEarlyWithoutResponse(): void {
+        $listener = $this->makeListener();
+
+        $request = Request::create('https://example.com/', 'GET');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertFalse($event->hasResponse());
+    }
+
+    public function testPostToNonAuthSubdomainReturnsEarlyWithoutResponse(): void {
+        // POST only counts as a login attempt when on the auth subdomain
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener(domainManager: $domainManager);
+
+        $request = Request::create('https://app.example.com/', 'POST');
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertFalse($event->hasResponse());
+    }
+
+    /* ── successful login via header ──────────────────────────────────── */
+
+    public function testSuccessfulLoginViaHeaderSetsResponseFromManager(): void {
+        $expected = new Response('hi alice', 200, ['Remote-User' => 'alice']);
+        $loginManager = $this->createStub(LoginInterface::class);
+        $loginManager->method('checkToken')->willReturn($expected);
+
+        $listener = $this->makeListener(loginManager: $loginManager);
+
+        $payload = $this->encodePayload([
+            'id' => 'alice', 'token' => '123456', 'nonce' => 'nonce-1', 'json' => true,
+        ]);
+        $request = Request::create('https://example.com/', 'GET');
+        $request->headers->set(self::HEADER_NAME, $payload);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        self::assertSame($expected, $event->getResponse());
+    }
+
+    public function testSuccessfulLoginViaPostToAuthSubdomain(): void {
+        $expected = new Response('hi bob', 303, ['Location' => '/']);
+        $loginManager = $this->createStub(LoginInterface::class);
+        $loginManager->method('checkToken')->willReturn($expected);
+
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener(loginManager: $loginManager, domainManager: $domainManager);
+
+        $request = Request::create('https://auth.example.com/', 'POST', [
+            'username' => 'bob', 'totp' => '654321', 'nonce' => 'nonce-2',
+        ]);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        self::assertSame($expected, $event->getResponse());
+    }
+
+    /* ── failed login ─────────────────────────────────────────────────── */
+
+    public function testFailedLoginReturnsJsonErrorWithNewNonce(): void {
+        $loginManager = $this->createStub(LoginInterface::class);
+        $loginManager->method('checkToken')->willReturn(null);
+
+        $listener = $this->makeListener(loginManager: $loginManager);
+
+        $payload = $this->encodePayload([
+            'id' => 'alice', 'token' => 'wrong', 'nonce' => 'nonce-1', 'json' => true,
+        ]);
+        $request = Request::create('https://example.com/', 'GET');
+        $request->headers->set(self::HEADER_NAME, $payload);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_UNAUTHORIZED, $response->getStatusCode());
+        self::assertSame('application/json', $response->headers->get('Content-Type'));
+        $body = json_decode($response->getContent(), true);
+        // the TotpTestHelper::makeConfig default errorMessage is 'Error'
+        self::assertSame('Error', $body['message']);
+        self::assertNotEmpty($body['nonce']);
+        self::assertFalse($body['post']);
+        // username is echoed back (sanitized via makeCacheKey)
+        self::assertSame('alice', $body['username']);
+    }
+
+    public function testFailedLoginHtmlResponseWhenJsonFalse(): void {
+        $loginManager = $this->createStub(LoginInterface::class);
+        $loginManager->method('checkToken')->willReturn(null);
+
+        $listener = $this->makeListener(loginManager: $loginManager);
+
+        $payload = $this->encodePayload([
+            'id' => 'alice', 'token' => 'wrong', 'nonce' => 'nonce-1', 'json' => false,
+        ]);
+        $request = Request::create('https://example.com/', 'GET');
+        $request->headers->set(self::HEADER_NAME, $payload);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_UNAUTHORIZED, $response->getStatusCode());
+        self::assertSame('text/html', $response->headers->get('Content-Type'));
+        self::assertStringContainsString('<form', $response->getContent());
+    }
+
+    public function testFailedLoginOnAuthSubdomainUsesPostForm(): void {
+        $loginManager = $this->createStub(LoginInterface::class);
+        $loginManager->method('checkToken')->willReturn(null);
+
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener(
+            loginManager: $loginManager,
+            domainManager: $domainManager,
+        );
+
+        $payload = $this->encodePayload([
+            'id' => 'alice', 'token' => 'wrong', 'nonce' => 'nonce-1', 'json' => false,
+        ]);
+        $request = Request::create('https://auth.example.com/', 'GET');
+        $request->headers->set(self::HEADER_NAME, $payload);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $content = $event->getResponse()->getContent();
+        self::assertStringContainsString('method="post"', $content);
+    }
+
+    /* ── rate-limited (blocked) login ─────────────────────────────────── */
+
+    public function testRateLimitedLoginReturnsTeapotWhenTeapotEnabled(): void {
+        $loginManager = $this->createStub(LoginInterface::class);
+        $loginManager->method('checkToken')->willReturn(null);
+
+        // limiter with 0 remaining tokens -> blocked
+        $listener = $this->makeListener(
+            loginManager: $loginManager,
+            rateLimitRemaining: 0,
+        );
+
+        $payload = $this->encodePayload([
+            'id' => 'alice', 'token' => 'wrong', 'nonce' => 'nonce-1', 'json' => true,
+        ]);
+        $request = Request::create('https://example.com/', 'GET');
+        $request->headers->set(self::HEADER_NAME, $payload);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_I_AM_A_TEAPOT, $response->getStatusCode());
+        $body = json_decode($response->getContent(), true);
+        // the TotpTestHelper::makeConfig default teapotTitle is 'Teapot'
+        self::assertSame('Teapot', $body['message']);
+    }
+
+    public function testRateLimitedLoginReturnsTooManyRequestsWhenTeapotDisabled(): void {
+        $loginManager = $this->createStub(LoginInterface::class);
+        $loginManager->method('checkToken')->willReturn(null);
+
+        $listener = new LoginListener(
+            $this->makeTwig(),
+            $this->makeRateLimiterFactory(0),
+            new DomainManager(false, ''),
+            $loginManager,
+            $this->makeConfig(teapot: false),
+        );
+        $listener->setLogger(new NullLogger());
+        $listener->setNonceCache(new ArrayAdapter());
+
+        $payload = $this->encodePayload([
+            'id' => 'alice', 'token' => 'wrong', 'nonce' => 'nonce-1', 'json' => true,
+        ]);
+        $request = Request::create('https://example.com/', 'GET');
+        $request->headers->set(self::HEADER_NAME, $payload);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_TOO_MANY_REQUESTS, $response->getStatusCode());
+        $body = json_decode($response->getContent(), true);
+        // teapot disabled, so tooManyTitle is used; helper default is 'Too Many'
+        self::assertSame('Too Many', $body['message']);
+    }
+
+    /* ── invalid payload handling ─────────────────────────────────────── */
+
+    public function testInvalidHeaderPayloadStillRecordsFailureAndResponds(): void {
+        $loginManager = $this->createMock(LoginInterface::class);
+        // checkToken should not be called with a null payload
+        $loginManager->expects(self::never())->method('checkToken');
+
+        $listener = $this->makeListener(loginManager: $loginManager);
+
+        // an un-decodable header value
+        $request = Request::create('https://example.com/', 'GET');
+        $request->headers->set(self::HEADER_NAME, '!!!not-valid-base64!!!');
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        // Payload::decode returns null, so checkToken is skipped, but a
+        // failure response is still produced (the rate limiter is consulted)
+        self::assertTrue($event->hasResponse());
+        self::assertSame(Response::HTTP_UNAUTHORIZED, $event->getResponse()->getStatusCode());
+    }
+
+    public function testPostWithoutRequiredFieldsDoesNotAttemptLogin(): void {
+        $loginManager = $this->createMock(LoginInterface::class);
+        $loginManager->expects(self::never())->method('checkToken');
+
+        $domainManager = new DomainManager(true, 'auth.example.com');
+        $listener = $this->makeListener(
+            loginManager: $loginManager,
+            domainManager: $domainManager,
+        );
+
+        // POST to auth subdomain but missing the required fields
+        $request = Request::create('https://auth.example.com/', 'POST', ['username' => 'only-user']);
+
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        // Payload::load returns null (missing totp & nonce), so it falls through
+        // to the failure path and produces a response
+        self::assertTrue($event->hasResponse());
+    }
+}

tests/Unit/Listener/RejectListenerTest.php

@@ -0,0 +1,89 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Listener;
+
+use App\Listener\RejectListener;
+use App\Service\DomainManager;
+use App\Tests\Support\ListenerTestHelper;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\NullLogger;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+final class RejectListenerTest extends TestCase {
+    use ListenerTestHelper;
+
+    private function makeListener(
+        bool $teapot = true,
+        int $remainingTokens = 5,
+    ): RejectListener {
+        $listener = new RejectListener(
+            $this->makeConfig(teapot: $teapot),
+            $this->makeTwig(),
+            $this->makeRateLimiterFactory($remainingTokens),
+        );
+        $listener->setLogger(new NullLogger());
+        return $listener;
+    }
+
+    private function makeEvent(Request $request): RequestEvent {
+        return new RequestEvent(
+            $this->createStub(HttpKernelInterface::class),
+            $request,
+            HttpKernelInterface::MAIN_REQUEST,
+        );
+    }
+
+    public function testBlockedRequestReturnsTeapotWhenTeapotEnabled(): void {
+        $listener = $this->makeListener(teapot: true, remainingTokens: 0);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_I_AM_A_TEAPOT, $response->getStatusCode());
+        self::assertSame('text/html', $response->headers->get('Content-Type'));
+    }
+
+    public function testBlockedRequestReturnsTooManyRequestsWhenTeapotDisabled(): void {
+        $listener = $this->makeListener(teapot: false, remainingTokens: 0);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        self::assertTrue($event->hasResponse());
+        $response = $event->getResponse();
+        self::assertSame(Response::HTTP_TOO_MANY_REQUESTS, $response->getStatusCode());
+        self::assertSame('text/html', $response->headers->get('Content-Type'));
+    }
+
+    public function testUnblockedRequestSetsNoResponse(): void {
+        $listener = $this->makeListener(remainingTokens: 5);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        // consume(0) with remaining tokens > 0 should not block
+        self::assertFalse($event->hasResponse());
+    }
+
+    public function testBlockedResponseContainsErrorTemplateContent(): void {
+        $listener = $this->makeListener(teapot: true, remainingTokens: 0);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+        $event = $this->makeEvent($request);
+        $listener->onKernelRequest($event);
+
+        $content = $event->getResponse()->getContent();
+        // Twig escapes the apostrophe in "I'm a teapot" to &#039;
+        self::assertStringContainsString('a teapot', $content);
+        self::assertStringContainsString('I refuse to brew coffee', $content);
+    }
+}

tests/Unit/MonitorCacheKeysTest.php

@@ -0,0 +1,273 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit;
+
+use App\MonitorCacheKeys;
+use OutOfBoundsException;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+
+final class MonitorCacheKeysTest extends TestCase {
+    private function wrap(?ArrayAdapter $pool = null): MonitorCacheKeys {
+        $pool ??= new ArrayAdapter();
+        return new MonitorCacheKeys($pool);
+    }
+
+    public function testConstructorInitializesEmptyPool(): void {
+        $monitor = $this->wrap();
+
+        self::assertSame([], $monitor->getKeys());
+        self::assertSame([], $monitor->getChanges());
+    }
+
+    public function testSaveAddsKeyAndTracksChange(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('alpha');
+        $item->set('value');
+        $monitor->save($item);
+
+        self::assertSame(['alpha'], $monitor->getKeys());
+        self::assertSame(['alpha' => MonitorCacheKeys::UPDATED], $monitor->getChanges());
+    }
+
+    public function testSaveDeferredThenCommitAddsKey(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('beta');
+        $item->set('value');
+        $monitor->saveDeferred($item);
+
+        // saveDeferred calls update() which commits immediately
+        self::assertSame(['beta'], $monitor->getKeys());
+        self::assertSame(['beta' => MonitorCacheKeys::UPDATED], $monitor->getChanges());
+    }
+
+    public function testGetItemReturnsUnderlyingItem(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('mykey');
+        $item->set('data');
+        $monitor->save($item);
+
+        $fetched = $monitor->getItem('mykey');
+        self::assertTrue($fetched->isHit());
+        self::assertSame('data', $fetched->get());
+    }
+
+    public function testGetItemsReturnsMultipleItems(): void {
+        $monitor = $this->wrap();
+        $a = $monitor->getItem('a');
+        $a->set(1);
+        $monitor->save($a);
+        $b = $monitor->getItem('b');
+        $b->set(2);
+        $monitor->save($b);
+
+        $items = $monitor->getItems(['a', 'b']);
+        $keys = [];
+        foreach ($items as $key => $item) {
+            $keys[$key] = $item->get();
+        }
+        self::assertSame(['a' => 1, 'b' => 2], $keys);
+    }
+
+    public function testHasItemReturnsTrueForExistingKey(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('exists');
+        $item->set('v');
+        $monitor->save($item);
+
+        self::assertTrue($monitor->hasItem('exists'));
+        self::assertFalse($monitor->hasItem('missing'));
+    }
+
+    public function testDeleteItemRemovesKeyAndTracksRemoval(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('doomed');
+        $item->set('v');
+        $monitor->save($item);
+
+        $monitor->deleteItem('doomed');
+
+        self::assertSame([], $monitor->getKeys());
+        self::assertSame(['doomed' => MonitorCacheKeys::REMOVED], $monitor->getChanges());
+        self::assertFalse($monitor->hasItem('doomed'));
+    }
+
+    public function testDeleteItemOnMissingKeyIsNoop(): void {
+        $monitor = $this->wrap();
+
+        $result = $monitor->deleteItem('nonexistent');
+
+        self::assertTrue($result);
+        self::assertSame([], $monitor->getKeys());
+    }
+
+    public function testDeleteItemsRemovesMultipleKeys(): void {
+        $monitor = $this->wrap();
+        foreach (['x', 'y', 'z'] as $key) {
+            $item = $monitor->getItem($key);
+            $item->set($key);
+            $monitor->save($item);
+        }
+
+        $monitor->deleteItems(['x', 'y']);
+
+        self::assertSame(['z'], $monitor->getKeys());
+        $changes = $monitor->getChanges();
+        self::assertSame(MonitorCacheKeys::REMOVED, $changes['x']);
+        self::assertSame(MonitorCacheKeys::REMOVED, $changes['y']);
+    }
+
+    public function testDeleteItemsWithMissingKeysStillReturnsTrue(): void {
+        $monitor = $this->wrap();
+
+        $result = $monitor->deleteItems(['ghost1', 'ghost2']);
+
+        self::assertTrue($result);
+    }
+
+    public function testClearWipesPoolWhenNotEmpty(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('keep');
+        $item->set('v');
+        $monitor->save($item);
+
+        $result = $monitor->clear();
+
+        self::assertTrue($result);
+        self::assertSame([], $monitor->getKeys());
+    }
+
+    public function testClearIsNoopWhenEmpty(): void {
+        $monitor = $this->wrap();
+
+        $result = $monitor->clear();
+
+        self::assertTrue($result);
+    }
+
+    public function testMarkCleanResetsChangeList(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('temp');
+        $item->set('v');
+        $monitor->save($item);
+
+        self::assertNotEmpty($monitor->getChanges());
+
+        $monitor->markClean();
+
+        self::assertSame([], $monitor->getChanges());
+        self::assertSame(['temp'], $monitor->getKeys());
+    }
+
+    public function testCommitPassesThrough(): void {
+        $monitor = $this->wrap();
+
+        self::assertTrue($monitor->commit());
+    }
+
+    public function testSaveKeyListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('__key_list');
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->save($item);
+    }
+
+    public function testSaveChangeListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('__chg_list');
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->save($item);
+    }
+
+    public function testDeleteKeyListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->deleteItem('__key_list');
+    }
+
+    public function testDeleteChangeListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->deleteItem('__chg_list');
+    }
+
+    public function testDeleteItemsWithKeyListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->deleteItems(['safe', '__key_list']);
+    }
+
+    public function testDeleteItemsWithChangeListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->deleteItems(['__chg_list']);
+    }
+
+    public function testSaveDeferredOnKeyListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('safe');
+        $item->set('value');
+
+        // getItem returns the real item, but saveDeferred calls update() which
+        // validates the key — so we need to get the __key_list item and try to save it
+        $keyListItem = $monitor->getItem('__key_list');
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->saveDeferred($keyListItem);
+    }
+
+    public function testSaveDeferredOnChangeListThrowsOutOfBoundsException(): void {
+        $monitor = $this->wrap();
+        $changeListItem = $monitor->getItem('__chg_list');
+
+        $this->expectException(OutOfBoundsException::class);
+        $monitor->saveDeferred($changeListItem);
+    }
+
+    public function testGetKeysReturnsEmptyArrayWhenKeyListMissing(): void {
+        // If the underlying pool loses its key list, getKeys should return []
+        $pool = new ArrayAdapter();
+        $monitor = new MonitorCacheKeys($pool);
+
+        $item = $monitor->getItem('alpha');
+        $item->set('value');
+        $monitor->save($item);
+
+        // delete the key list directly from the underlying pool
+        $pool->deleteItem('__key_list');
+
+        $monitor2 = new MonitorCacheKeys($pool);
+        // the constructor will re-initialize since __key_list is missing
+        // but getKeys on the new monitor should be empty
+        self::assertSame([], $monitor2->getKeys());
+    }
+
+    public function testDeleteItemReturnsTrueForExistingKey(): void {
+        $monitor = $this->wrap();
+        $item = $monitor->getItem('to-delete');
+        $item->set('value');
+        $monitor->save($item);
+
+        self::assertTrue($monitor->deleteItem('to-delete'));
+        self::assertNotContains('to-delete', $monitor->getKeys());
+    }
+
+    public function testDeleteItemsReturnsTrue(): void {
+        $monitor = $this->wrap();
+        foreach (['a', 'b', 'c'] as $key) {
+            $item = $monitor->getItem($key);
+            $item->set('value');
+            $monitor->save($item);
+        }
+
+        self::assertTrue($monitor->deleteItems(['a', 'b', 'c']));
+        self::assertSame([], $monitor->getKeys());
+    }
+}

tests/Unit/PersistCacheTest.php

@@ -0,0 +1,220 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit;
+
+use App\MonitorCacheKeys;
+use App\PersistCache;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+
+final class PersistCacheTest extends TestCase {
+    public function testBootWithEmptyStorageIsNoop(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+
+        // nothing was loaded since storage is empty
+        $monitor = new MonitorCacheKeys($sessionCache);
+        self::assertSame([], $monitor->getKeys());
+    }
+
+    public function testBootLoadsFromStorageIntoCache(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        // populate storage with some session data
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        $item = $storageMonitor->getItem('cookie_abc');
+        $item->set('user1');
+        $storageMonitor->save($item);
+        $storageMonitor->markClean();
+
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+
+        // session cache should now contain the loaded data
+        $cacheMonitor = new MonitorCacheKeys($sessionCache);
+        self::assertContains('cookie_abc', $cacheMonitor->getKeys());
+        self::assertSame('user1', $cacheMonitor->getItem('cookie_abc')->get());
+        // boot should mark clean so no changes are pending
+        self::assertSame([], $cacheMonitor->getChanges());
+    }
+
+    public function testBootDoesNotReloadWhenCacheAlreadyWarm(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        // warm up the cache with existing data
+        $cacheMonitor = new MonitorCacheKeys($sessionCache);
+        $item = $cacheMonitor->getItem('cookie_existing');
+        $item->set('old-user');
+        $cacheMonitor->save($item);
+
+        // put different data in storage
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        $item = $storageMonitor->getItem('cookie_new');
+        $item->set('new-user');
+        $storageMonitor->save($item);
+
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+
+        // existing data should be preserved, storage data NOT loaded
+        $monitor = new MonitorCacheKeys($sessionCache);
+        self::assertContains('cookie_existing', $monitor->getKeys());
+        self::assertNotContains('cookie_new', $monitor->getKeys());
+    }
+
+    public function testPersistWritesChangesToStorage(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+
+        // write something to the session cache
+        $cacheMonitor = new MonitorCacheKeys($sessionCache);
+        $item = $cacheMonitor->getItem('cookie_xyz');
+        $item->set('user2');
+        $cacheMonitor->save($item);
+
+        $persist->persist();
+
+        // storage should now contain the change
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        self::assertContains('cookie_xyz', $storageMonitor->getKeys());
+        self::assertSame('user2', $storageMonitor->getItem('cookie_xyz')->get());
+    }
+
+    public function testPersistHandlesRemovals(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        // seed storage with an item
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        $item = $storageMonitor->getItem('cookie_to_remove');
+        $item->set('user3');
+        $storageMonitor->save($item);
+        $storageMonitor->markClean();
+
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+
+        // now delete it from session cache
+        $cacheMonitor = new MonitorCacheKeys($sessionCache);
+        $cacheMonitor->deleteItem('cookie_to_remove');
+
+        $persist->persist();
+
+        // storage should no longer have it
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        self::assertNotContains('cookie_to_remove', $storageMonitor->getKeys());
+    }
+
+    public function testPersistIsNoopWhenNoChanges(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+        $persist->persist();
+
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        self::assertSame([], $storageMonitor->getKeys());
+    }
+
+    public function testFullBootModifyPersistCycle(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        // boot (empty), add data, persist
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+
+        $cacheMonitor = new MonitorCacheKeys($sessionCache);
+        $item = $cacheMonitor->getItem('cookie_cycle');
+        $item->set('cycled-user');
+        $cacheMonitor->save($item);
+
+        $persist->persist();
+
+        // simulate a new request: fresh cache, same storage
+        $newCache = new ArrayAdapter();
+        $persist2 = new PersistCache($newCache, $sessionStorage);
+        $persist2->boot();
+
+        $monitor = new MonitorCacheKeys($newCache);
+        self::assertContains('cookie_cycle', $monitor->getKeys());
+        self::assertSame('cycled-user', $monitor->getItem('cookie_cycle')->get());
+    }
+
+    public function testPersistHandlesMixedUpdatesAndRemovals(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        // seed storage with two items
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        $item1 = $storageMonitor->getItem('cookie_keep');
+        $item1->set('user-keep');
+        $storageMonitor->save($item1);
+        $item2 = $storageMonitor->getItem('cookie_remove');
+        $item2->set('user-remove');
+        $storageMonitor->save($item2);
+        $storageMonitor->markClean();
+
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+
+        // update one item and delete the other in the same cycle
+        $cacheMonitor = new MonitorCacheKeys($sessionCache);
+        $item1 = $cacheMonitor->getItem('cookie_keep');
+        $item1->set('user-updated');
+        $cacheMonitor->save($item1);
+        $cacheMonitor->deleteItem('cookie_remove');
+
+        $persist->persist();
+
+        // storage should reflect both changes
+        $storageMonitor = new MonitorCacheKeys($sessionStorage);
+        self::assertContains('cookie_keep', $storageMonitor->getKeys());
+        self::assertSame('user-updated', $storageMonitor->getItem('cookie_keep')->get());
+        self::assertNotContains('cookie_remove', $storageMonitor->getKeys());
+    }
+
+    public function testMultipleBootModifyPersistCycles(): void {
+        $sessionCache = new ArrayAdapter();
+        $sessionStorage = new ArrayAdapter();
+
+        // cycle 1: add item A
+        $persist = new PersistCache($sessionCache, $sessionStorage);
+        $persist->boot();
+        $cacheMonitor = new MonitorCacheKeys($sessionCache);
+        $item = $cacheMonitor->getItem('cookie_a');
+        $item->set('user-a');
+        $cacheMonitor->save($item);
+        $persist->persist();
+
+        // cycle 2: fresh cache, add item B, keep A from storage
+        $newCache = new ArrayAdapter();
+        $persist2 = new PersistCache($newCache, $sessionStorage);
+        $persist2->boot();
+        $cacheMonitor2 = new MonitorCacheKeys($newCache);
+        $item = $cacheMonitor2->getItem('cookie_b');
+        $item->set('user-b');
+        $cacheMonitor2->save($item);
+        $persist2->persist();
+
+        // cycle 3: fresh cache, both A and B should be loaded from storage
+        $newCache2 = new ArrayAdapter();
+        $persist3 = new PersistCache($newCache2, $sessionStorage);
+        $persist3->boot();
+        $monitor = new MonitorCacheKeys($newCache2);
+        self::assertContains('cookie_a', $monitor->getKeys());
+        self::assertSame('user-a', $monitor->getItem('cookie_a')->get());
+        self::assertContains('cookie_b', $monitor->getKeys());
+        self::assertSame('user-b', $monitor->getItem('cookie_b')->get());
+    }
+}

tests/Unit/Service/BackupCodeManagerTest.php

@@ -0,0 +1,215 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Service;
+
+use App\Service\BackupCodeManager;
+use App\Tests\Support\TotpTestHelper;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+
+final class BackupCodeManagerTest extends TestCase {
+    use TotpTestHelper;
+
+    private function makeManager(?ArrayAdapter $pool = null): BackupCodeManager {
+        $pool ??= new ArrayAdapter();
+        $manager = new BackupCodeManager($pool);
+        $manager->setConfig($this->makeConfig());
+        $manager->setLogger(new NullLogger());
+        return $manager;
+    }
+
+    public function testGenerateReturnsRequestedCount(): void {
+        $manager = $this->makeManager();
+
+        $codes = $manager->generate(5);
+
+        self::assertCount(5, $codes);
+        foreach ($codes as $code) {
+            self::assertIsString($code);
+            // codes are lowercase alphanumeric
+            self::assertMatchesRegularExpression('/^[a-z0-9]+$/', $code);
+        }
+    }
+
+    public function testGenerateDefaultCount(): void {
+        $manager = $this->makeManager();
+
+        $codes = $manager->generate();
+
+        self::assertCount(10, $codes);
+    }
+
+    public function testGenerateZeroReturnsEmptyArray(): void {
+        $manager = $this->makeManager();
+
+        $codes = $manager->generate(0);
+
+        self::assertSame([], $codes);
+    }
+
+    public function testGeneratedCodesAreStoredInCache(): void {
+        $pool = new ArrayAdapter();
+        $manager = $this->makeManager($pool);
+
+        $codes = $manager->generate(3);
+
+        // each code should be stored as a backup_ key
+        foreach ($codes as $code) {
+            $key = 'backup_' . strtolower($code);
+            // the manager uses makeCacheKey which sanitizes, but for alphanumeric it's identity
+            $item = $pool->getItem($key);
+            self::assertTrue($item->isHit(), "Expected cache hit for key: $key");
+            self::assertTrue($item->get(), "Expected code to be marked valid (true)");
+        }
+    }
+
+    public function testGeneratedCodesHaveFarFutureExpiry(): void {
+        $pool = new ArrayAdapter();
+        $manager = $this->makeManager($pool);
+
+        $codes = $manager->generate(1);
+        $code = $codes[0];
+
+        $item = $pool->getItem('backup_' . strtolower($code));
+        $expiry = $item->getMetadata()['expiry'];
+        self::assertGreaterThan((new \DateTimeImmutable('+10 years'))->getTimestamp(), (int) $expiry);
+    }
+
+    public function testVerifyAndConsumeValidCode(): void {
+        $manager = $this->makeManager();
+        $codes = $manager->generate(2);
+
+        $code = $codes[0];
+
+        self::assertTrue($manager->verifyAndConsume($code));
+    }
+
+    public function testVerifyAndConsumeMarksCodeAsUsed(): void {
+        $pool = new ArrayAdapter();
+        $manager = $this->makeManager($pool);
+        $codes = $manager->generate(1);
+        $code = $codes[0];
+
+        // first use succeeds
+        self::assertTrue($manager->verifyAndConsume($code));
+
+        // second use fails (already consumed)
+        self::assertFalse($manager->verifyAndConsume($code));
+    }
+
+    public function testVerifyAndConsumeInvalidCode(): void {
+        $manager = $this->makeManager();
+
+        self::assertFalse($manager->verifyAndConsume('nonexistent_code'));
+    }
+
+    public function testVerifyAndConsumeIsCaseInsensitive(): void {
+        $manager = $this->makeManager();
+        $codes = $manager->generate(1);
+        $code = $codes[0];
+
+        // uppercase version should still work
+        self::assertTrue($manager->verifyAndConsume(strtoupper($code)));
+    }
+
+    public function testVerifyAndConsumeStripsInvalidCharacters(): void {
+        $manager = $this->makeManager();
+        $codes = $manager->generate(1);
+        $code = $codes[0];
+
+        // inject spaces and special chars — should be stripped
+        self::assertTrue($manager->verifyAndConsume('  ' . $code . '!!'));
+    }
+
+    public function testExpireRemovesAllBackupCodes(): void {
+        $pool = new ArrayAdapter();
+        $manager = $this->makeManager($pool);
+        $codes = $manager->generate(5);
+
+        $manager->expire();
+
+        // all backup keys should be gone
+        foreach ($codes as $code) {
+            self::assertFalse($pool->hasItem('backup_' . strtolower($code)));
+        }
+    }
+
+    public function testExpireWhenNoBackupCodesIsNoop(): void {
+        $pool = new ArrayAdapter();
+        $manager = $this->makeManager($pool);
+
+        // should not throw
+        $manager->expire();
+
+        // this passes if no exception was thrown
+        self::assertTrue(true);
+    }
+
+    public function testExpireRemovesOnlyBackupPrefixedKeys(): void {
+        $pool = new ArrayAdapter();
+        $manager = $this->makeManager($pool);
+
+        $codes = $manager->generate(3);
+
+        // add a non-backup key
+        $item = $pool->getItem('cookie_session');
+        $item->set('data');
+        $pool->save($item);
+
+        $manager->expire();
+
+        // non-backup key survives
+        self::assertTrue($pool->hasItem('cookie_session'));
+
+        // backup keys are gone
+        foreach ($codes as $code) {
+            self::assertFalse($pool->hasItem('backup_' . strtolower($code)));
+        }
+    }
+
+    public function testVerifyAndConsumeEmptyStringReturnsFalse(): void {
+        $manager = $this->makeManager();
+
+        // empty string after preg_replace becomes 'backup_' with nothing after it
+        self::assertFalse($manager->verifyAndConsume(''));
+    }
+
+    public function testVerifyAndConsumeCodeWithValueFalseReturnsFalse(): void {
+        $pool = new ArrayAdapter();
+        $manager = $this->makeManager($pool);
+        $codes = $manager->generate(1);
+        $code = $codes[0];
+
+        // first use succeeds
+        self::assertTrue($manager->verifyAndConsume($code));
+
+        // the code is now marked as false (used); isHit is true but get() is false
+        $key = 'backup_' . strtolower($code);
+        $item = $pool->getItem($key);
+        self::assertTrue($item->isHit());
+        self::assertFalse($item->get());
+
+        // second use should fail because get() returns false
+        self::assertFalse($manager->verifyAndConsume($code));
+    }
+
+    public function testGenerateProducesUniqueCodes(): void {
+        $manager = $this->makeManager();
+
+        $codes = $manager->generate(50);
+
+        self::assertCount(50, $codes);
+        self::assertCount(50, array_unique($codes), 'All generated codes should be unique');
+    }
+
+    public function testGenerateCodeLengthIsDigitsPlusTwo(): void {
+        $manager = $this->makeManager();
+
+        $codes = $manager->generate(1);
+
+        // default TOTP digits is 6, so code length should be 6 + 2 = 8
+        self::assertSame(8, strlen($codes[0]));
+    }
+}

tests/Unit/Service/DomainManagerTest.php

@@ -0,0 +1,241 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Service;
+
+use App\Service\DomainManager;
+use PHPUnit\Framework\TestCase;
+
+final class DomainManagerTest extends TestCase {
+    private function createManager(bool $subdomainRedirect, string $authSubdomain): DomainManager {
+        return new DomainManager($subdomainRedirect, $authSubdomain);
+    }
+
+    /* ── authBase / getAuthSubdomain ─────────────────────────────────────── */
+
+    public function testAuthBaseIsNullWhenSubdomainRedirectIsDisabled(): void {
+        $manager = $this->createManager(false, 'auth.example.com');
+        self::assertNull($manager->authBase());
+        self::assertNull($manager->getAuthSubdomain());
+    }
+
+    public function testAuthBaseIsNullWhenAuthSubdomainIsEmpty(): void {
+        $manager = $this->createManager(true, '');
+        self::assertNull($manager->authBase());
+        self::assertNull($manager->getAuthSubdomain());
+    }
+
+    public function testAuthBaseExtractsSimpleDomain(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertSame('example.com', $manager->authBase());
+        self::assertSame('auth.example.com', $manager->getAuthSubdomain());
+    }
+
+    public function testAuthBaseExtractsMultiPartTld(): void {
+        $manager = $this->createManager(true, 'auth.example.co.uk');
+        self::assertSame('example.co.uk', $manager->authBase());
+        self::assertSame('auth.example.co.uk', $manager->getAuthSubdomain());
+    }
+
+    public function testAuthBaseIsNullForLocalhostAuth(): void {
+        $manager = $this->createManager(true, 'localhost');
+        self::assertNull($manager->authBase());
+        self::assertNull($manager->getAuthSubdomain());
+    }
+
+    public function testAuthBaseIsNullForIpAuth(): void {
+        $manager = $this->createManager(true, '192.168.1.1');
+        self::assertNull($manager->authBase());
+        self::assertNull($manager->getAuthSubdomain());
+    }
+
+    /* ── validReturn ──────────────────────────────────────────────────────── */
+
+    public function testValidReturnAcceptsAnyUrlWhenNoSubdomain(): void {
+        $manager = $this->createManager(false, '');
+        self::assertTrue($manager->validReturn('https://evil.com/page'));
+        self::assertTrue($manager->validReturn('https://example.com/ok'));
+    }
+
+    public function testValidReturnRejectsInvalidUrl(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->validReturn('not-a-url'));
+        self::assertFalse($manager->validReturn(''));
+    }
+
+    public function testValidReturnAcceptsSameBaseDomain(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertTrue($manager->validReturn('https://app.example.com/dashboard'));
+        self::assertTrue($manager->validReturn('https://example.com/'));
+    }
+
+    public function testValidReturnRejectsDifferentBaseDomain(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->validReturn('https://evil.com/phish'));
+        self::assertFalse($manager->validReturn('https://other-example.com/'));
+    }
+
+    public function testValidReturnHandlesCoUkTld(): void {
+        $manager = $this->createManager(true, 'auth.example.co.uk');
+        self::assertTrue($manager->validReturn('https://www.example.co.uk/'));
+        self::assertFalse($manager->validReturn('https://example.com/'));
+    }
+
+    public function testValidReturnRejectsUrlWithoutHost(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->validReturn('mailto:test@example.com'));
+    }
+
+    /* ── matchesAuth ──────────────────────────────────────────────────────── */
+
+    public function testMatchesAuthIsFalseWhenSubdomainRedirectDisabled(): void {
+        $manager = $this->createManager(false, 'auth.example.com');
+        self::assertFalse($manager->matchesAuth('example.com'));
+        self::assertFalse($manager->matchesAuth('app.example.com'));
+    }
+
+    public function testMatchesAuthIsFalseWhenAuthSubdomainIsEmpty(): void {
+        $manager = $this->createManager(true, '');
+        self::assertFalse($manager->matchesAuth('example.com'));
+    }
+
+    public function testMatchesAuthMatchesSameBaseDomain(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertTrue($manager->matchesAuth('example.com'));
+        self::assertTrue($manager->matchesAuth('app.example.com'));
+    }
+
+    public function testMatchesAuthRejectsDifferentBaseDomain(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->matchesAuth('evil.com'));
+        self::assertFalse($manager->matchesAuth('example.org'));
+    }
+
+    public function testMatchesAuthHandlesMultiPartTld(): void {
+        $manager = $this->createManager(true, 'auth.example.co.uk');
+        self::assertTrue($manager->matchesAuth('www.example.co.uk'));
+        self::assertFalse($manager->matchesAuth('example.com'));
+    }
+
+    public function testMatchesAuthRejectsIpHost(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->matchesAuth('192.168.1.1'));
+    }
+
+    public function testMatchesAuthRejectsLocalhost(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->matchesAuth('localhost'));
+    }
+
+    /* ── baseDomain edge cases via matchesAuth ────────────────────────────── */
+
+    public function testMatchesAuthWithDeepSubdomain(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertTrue($manager->matchesAuth('a.b.c.example.com'));
+    }
+
+    public function testMatchesAuthWithTwoPartDomain(): void {
+        /* for a 2-part auth subdomain, the baseDomain retains both parts */
+        $manager = $this->createManager(true, 'auth.local');
+        self::assertSame('auth.local', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('auth.local'));
+        self::assertFalse($manager->matchesAuth('local'));
+        self::assertFalse($manager->matchesAuth('app.local'));
+    }
+
+    /* ── TLD table coverage ──────────────────────────────────────────────── */
+
+    public function testMatchesAuthWithComAuTld(): void {
+        // com.au is NOT in the TLD table (table has au? no, it doesn't),
+        // so it's treated as a standard 2-part TLD: base = com.au
+        $manager = $this->createManager(true, 'auth.example.com.au');
+        self::assertSame('com.au', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('app.example.com.au'));
+        self::assertFalse($manager->matchesAuth('example.com'));
+    }
+
+    public function testMatchesAuthWithCoJpTld(): void {
+        // co.jp is NOT in the TLD table (table has jpn under com, not jp under co)
+        // so base = co.jp
+        $manager = $this->createManager(true, 'auth.example.co.jp');
+        self::assertSame('co.jp', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('www.example.co.jp'));
+    }
+
+    public function testMatchesAuthWithComBrTld(): void {
+        // com.br: TLD table has com => [br], meaning *.br.com is multi-part
+        // but com.br has last=br, TLD['br'] doesn't exist, so base = com.br
+        $manager = $this->createManager(true, 'auth.example.com.br');
+        self::assertSame('com.br', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('app.example.com.br'));
+    }
+
+    public function testMatchesAuthWithCoNzTld(): void {
+        // co.nz is NOT in the TLD table (nz => [co,net,org], so *.co.nz IS multi-part)
+        $manager = $this->createManager(true, 'auth.example.co.nz');
+        self::assertSame('example.co.nz', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('sub.example.co.nz'));
+    }
+
+    public function testMatchesAuthWithComMxTld(): void {
+        // com.mx is NOT in the TLD table (mx => [com,net,org], so *.com.mx IS multi-part)
+        $manager = $this->createManager(true, 'auth.example.com.mx');
+        self::assertSame('example.com.mx', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('app.example.com.mx'));
+    }
+
+    public function testMatchesAuthWithCoInTld(): void {
+        // co.in: in => [co,...], so *.co.in IS multi-part
+        $manager = $this->createManager(true, 'auth.example.co.in');
+        self::assertSame('example.co.in', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('app.example.co.in'));
+    }
+
+    public function testMatchesAuthWithBrComTld(): void {
+        // br.com: TLD table has com => [br], so *.br.com IS multi-part
+        $manager = $this->createManager(true, 'auth.example.br.com');
+        self::assertSame('example.br.com', $manager->authBase());
+        self::assertTrue($manager->matchesAuth('app.example.br.com'));
+    }
+
+    public function testSimpleTldNotTreatedAsMultiPart(): void {
+        // example.com is a standard 2-part domain, not multi-part
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertSame('example.com', $manager->authBase());
+        // auth.example.org should NOT match example.com
+        self::assertFalse($manager->matchesAuth('app.example.org'));
+    }
+
+    /* ── baseDomain edge cases ───────────────────────────────────────────── */
+
+    public function testMatchesAuthWithSingleLabelHost(): void {
+        // a single-label domain (not localhost, not IP) has baseLength 1
+        // so 'myhost' has baseDomain 'myhost', while 'auth.local' has base 'auth.local'
+        // they won't match unless the auth subdomain itself is single-label
+        $manager = $this->createManager(true, 'auth.local');
+        // auth.local base is 'auth.local', 'local' base is 'local' -> no match
+        self::assertFalse($manager->matchesAuth('local'));
+        // but a subdomain of auth.local does match
+        self::assertTrue($manager->matchesAuth('app.auth.local'));
+    }
+
+    public function testMatchesAuthWithEmptyStringHost(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->matchesAuth(''));
+    }
+
+    public function testValidReturnAcceptsUrlWithPort(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertTrue($manager->validReturn('https://example.com:8080/path'));
+    }
+
+    public function testValidReturnAcceptsUrlWithoutPath(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertTrue($manager->validReturn('https://example.com'));
+    }
+
+    public function testValidReturnRejectsDifferentDomainWithPort(): void {
+        $manager = $this->createManager(true, 'auth.example.com');
+        self::assertFalse($manager->validReturn('https://evil.com:8080/path'));
+    }
+}

tests/Unit/Service/LoginManagerTest.php

@@ -0,0 +1,424 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Service;
+
+use App\Data\Payload;
+use App\Enum\Scope;
+use App\Service\BackupCodeInterface;
+use App\Service\DomainManager;
+use App\Trait\StringTrait;
+use App\Service\LoginManager;
+use App\Tests\Support\TotpTestHelper;
+use PHPUnit\Framework\TestCase;
+use Psr\Cache\CacheItemInterface;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+final class LoginManagerTest extends TestCase {
+    use TotpTestHelper;
+    use StringTrait;
+
+    private ArrayAdapter $pool;
+    private BackupCodeInterface $backupCodeManager;
+    private DomainManager $domainManager;
+
+    private function makeLoginManager(
+        ?int $ipTtl = 0,
+        bool $subdomainRedirect = false,
+        string $authSubdomain = '',
+    ): LoginManager {
+        $this->pool = new ArrayAdapter();
+        $this->backupCodeManager = $this->createStub(BackupCodeInterface::class);
+        $this->domainManager = new DomainManager($subdomainRedirect, $authSubdomain);
+
+        $manager = new LoginManager($this->pool, $this->backupCodeManager, $this->domainManager);
+        $manager->setConfig($this->makeConfig(ipTtl: $ipTtl));
+        $manager->setLogger(new NullLogger());
+        $manager->setNonceCache(new ArrayAdapter());
+        return $manager;
+    }
+
+    /** Build a Payload with a valid server-side nonce already stored. */
+    private function makePayloadWithNonce(
+        LoginManager $manager,
+        string $id = 'testuser',
+        Scope $scope = Scope::Cookie,
+        ?string $token = null,
+    ): Payload {
+        $token ??= $this->validTotpCode();
+        $nonce = $this->insertNonce($manager, 'test-nonce-123');
+
+        $payload = new Payload();
+        $payload->id = $id;
+        $payload->token = $token;
+        $payload->nonce = $nonce;
+        $payload->json = true;
+        $payload->scope = $scope;
+        return $payload;
+    }
+
+    /** Inject a nonce directly into the manager's nonce cache. */
+    private function insertNonce(LoginManager $manager, string $nonce): string {
+        $reflection = new \ReflectionProperty(LoginManager::class, 'nonceCache');
+        $nonceCache = $reflection->getValue($manager);
+
+        $key = $this->makeCacheKey($nonce);
+        $item = $nonceCache->getItem($key);
+        $item->set(true);
+        $nonceCache->save($item);
+
+        return $nonce;
+    }
+
+    public function testCheckTokenReturnsNullForInvalidTotp(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, token: 'wrong-code');
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/', 'GET');
+
+        self::assertNull($manager->checkToken($payload, $request));
+    }
+
+    public function testCheckTokenReturnsNullForSpentNonce(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        // spend the nonce first (use the same cache key the manager does)
+        $reflection = new \ReflectionProperty(LoginManager::class, 'nonceCache');
+        $nonceCache = $reflection->getValue($manager);
+        $nonceItem = $nonceCache->getItem($this->makeCacheKey('test-nonce-123'));
+        $nonceItem->set(false);
+        $nonceCache->save($nonceItem);
+
+        $request = Request::create('/', 'GET');
+
+        self::assertNull($manager->checkToken($payload, $request));
+    }
+
+    public function testCheckTokenReturnsNullForMissingNonce(): void {
+        $manager = $this->makeLoginManager();
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $payload = new Payload();
+        $payload->id = 'user1';
+        $payload->token = $this->validTotpCode();
+        $payload->nonce = 'never-stored';
+        $payload->json = true;
+        $payload->scope = Scope::Cookie;
+
+        $request = Request::create('/', 'GET');
+
+        self::assertNull($manager->checkToken($payload, $request));
+    }
+
+    public function testSuccessfulTotpLoginWithCookieScopeReturnsRedirect(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Cookie);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/dashboard', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        self::assertSame(303, $response->getStatusCode()); // HTTP_SEE_OTHER
+        self::assertTrue($response->headers->has('Location'));
+        self::assertTrue($response->headers->has('Set-Cookie'));
+    }
+
+    public function testSuccessfulLoginWithNoneScopeReturnsPlainResponse(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::None);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        self::assertSame(200, $response->getStatusCode());
+        self::assertSame('text/plain', $response->headers->get('Content-Type'));
+        self::assertTrue($response->headers->has('Remote-User'));
+        // no redirect for Scope::None
+        self::assertFalse($response->headers->has('Location'));
+    }
+
+    public function testSuccessfulLoginSetsRemoteUserHeader(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, id: 'alice', scope: Scope::None);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        self::assertSame('alice', $response->headers->get('Remote-User'));
+    }
+
+    public function testSuccessfulLoginJsonResponse(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Cookie, token: null);
+        $payload->json = true;
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/protected', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        self::assertSame('application/json', $response->headers->get('Content-Type'));
+        $body = json_decode($response->getContent(), true);
+        self::assertSame('Login successful', $body['message']);
+    }
+
+    public function testSuccessfulLoginHtmlResponse(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Cookie);
+        $payload->json = false;
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/protected', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        self::assertSame('text/html', $response->headers->get('Content-Type'));
+    }
+
+    public function testSuccessfulLoginWithReturnUrl(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Cookie);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/login?return=https://example.com/app', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        self::assertSame('https://example.com/app', $response->headers->get('Location'));
+    }
+
+    public function testSuccessfulLoginWithInvalidReturnFallsBackToPath(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Cookie);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/login?return=not-a-url', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        $location = $response->headers->get('Location');
+        self::assertStringStartsWith('/login', $location);
+    }
+
+    public function testIpScopeDowngradesToCookieWhenIpAccessDisabled(): void {
+        $manager = $this->makeLoginManager(ipTtl: 0);
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Ip);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        // Should have a Set-Cookie (downgraded to cookie scope)
+        self::assertNotNull($response);
+        self::assertTrue($response->headers->has('Set-Cookie'));
+    }
+
+    public function testIpScopeWhenEnabledSetsIpSession(): void {
+        $manager = $this->makeLoginManager(ipTtl: 1800);
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Ip);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/', 'GET', [], [], [], ['REMOTE_ADDR' => '1.2.3.4']);
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        // IP session should be stored; no Set-Cookie for IP scope
+        self::assertFalse($response->headers->has('Set-Cookie'));
+
+        // verify the IP session exists in the cache
+        $reflection = new \ReflectionProperty(LoginManager::class, 'sessionCache');
+        $sessionCache = $reflection->getValue($manager);
+        self::assertTrue($sessionCache->hasItem('ip_1.2.3.4'));
+    }
+
+    public function testBackupCodeAuthentication(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, token: 'backup-code-123');
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(true);
+
+        $request = Request::create('/', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        self::assertSame(303, $response->getStatusCode());
+    }
+
+    public function testNonceIsConsumedAfterSuccessfulLogin(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $request = Request::create('/', 'GET');
+
+        $manager->checkToken($payload, $request);
+
+        // nonce should now be marked invalid (false); look it up via the same
+        // cache key the manager uses (makeCacheKey rewrites '-' to '_')
+        $reflection = new \ReflectionProperty(LoginManager::class, 'nonceCache');
+        $nonceCache = $reflection->getValue($manager);
+        $nonceItem = $nonceCache->getItem($this->makeCacheKey('test-nonce-123'));
+        self::assertFalse($nonceItem->get());
+    }
+
+    public function testUlidCollisionThrowsHttpException(): void {
+        // Use a stub pool where every cookie_ key is already a hit (collision)
+        $pool = $this->createStub(CacheItemPoolInterface::class);
+        $item = $this->createStub(CacheItemInterface::class);
+        $item->method('isHit')->willReturn(true);
+        $item->method('get')->willReturn('existing');
+        // The nonce cache needs to work, so we return the stub item for
+        // cookie_ keys but a real working item for nonce keys.
+        $pool->method('getItem')->willReturnCallback(function (string $key) use ($item) {
+            if (str_starts_with($key, 'cookie_')) {
+                return $item; // collision
+            }
+            // For nonce keys, return a real item from an ArrayAdapter
+            static $realPool = null;
+            $realPool ??= new \Symfony\Component\Cache\Adapter\ArrayAdapter();
+            return $realPool->getItem($key);
+        });
+        $pool->method('hasItem')->willReturnCallback(function (string $key) use ($item) {
+            if (str_starts_with($key, 'cookie_')) {
+                return true;
+            }
+            static $realPool = null;
+            $realPool ??= new \Symfony\Component\Cache\Adapter\ArrayAdapter();
+            return $realPool->hasItem($key);
+        });
+        $pool->method('save')->willReturn(true);
+        $pool->method('saveDeferred')->willReturn(true);
+        $pool->method('commit')->willReturn(true);
+        $pool->method('getItems')->willReturnCallback(function (array $keys) {
+            static $realPool = null;
+            $realPool ??= new \Symfony\Component\Cache\Adapter\ArrayAdapter();
+            return $realPool->getItems($keys);
+        });
+        $pool->method('clear')->willReturn(true);
+        $pool->method('deleteItem')->willReturn(true);
+        $pool->method('deleteItems')->willReturn(true);
+
+        $this->domainManager = new DomainManager(false, '');
+        $this->backupCodeManager = $this->createStub(BackupCodeInterface::class);
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        $manager = new LoginManager($pool, $this->backupCodeManager, $this->domainManager);
+        $manager->setConfig($this->makeConfig());
+        $manager->setLogger(new NullLogger());
+        $manager->setNonceCache(new \Symfony\Component\Cache\Adapter\ArrayAdapter());
+
+        $payload = new Payload();
+        $payload->id = 'collide-user';
+        $payload->token = $this->validTotpCode();
+        $payload->nonce = 'test-nonce-123';
+        $payload->json = true;
+        $payload->scope = Scope::Cookie;
+
+        // inject the nonce
+        $this->insertNonce($manager, 'test-nonce-123');
+
+        $request = Request::create('/', 'GET');
+
+        $this->expectException(HttpException::class);
+        $manager->checkToken($payload, $request);
+    }
+
+    public function testCookieScopeWithCentralAuthSetsDomainOnMatchingHost(): void {
+        $manager = $this->makeLoginManager(
+            subdomainRedirect: true,
+            authSubdomain: 'auth.example.com',
+        );
+        $payload = $this->makePayloadWithNonce($manager, id: 'alice', scope: Scope::Cookie);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        // host matches the auth base domain
+        $request = Request::create('https://auth.example.com/', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        $cookies = $response->headers->getCookies();
+        self::assertCount(1, $cookies);
+        // when using central auth and host matches, the cookie domain is set
+        self::assertSame('example.com', $cookies[0]->getDomain());
+        // the auth cookie name is used instead of the host-prefixed name
+        self::assertSame('__Http-Domain-Preauth', $cookies[0]->getName());
+    }
+
+    public function testCookieScopeWithCentralAuthOnNonMatchingHostUsesNullDomain(): void {
+        $manager = $this->makeLoginManager(
+            subdomainRedirect: true,
+            authSubdomain: 'auth.example.com',
+        );
+        $payload = $this->makePayloadWithNonce($manager, id: 'bob', scope: Scope::Cookie);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        // host does NOT match the auth base domain
+        $request = Request::create('https://other.com/', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        $cookies = $response->headers->getCookies();
+        self::assertCount(1, $cookies);
+        // domain is null when host does not match
+        self::assertNull($cookies[0]->getDomain());
+        // still uses auth cookie name since authBase is set
+        self::assertSame('__Http-Domain-Preauth', $cookies[0]->getName());
+    }
+
+    public function testCheckTokenWithEmptyReturnParameterFallsBackToPath(): void {
+        $manager = $this->makeLoginManager();
+        $payload = $this->makePayloadWithNonce($manager, scope: Scope::Cookie);
+
+        $this->backupCodeManager->method('verifyAndConsume')->willReturn(false);
+
+        // return parameter is present but empty string
+        $request = Request::create('/?return=', 'GET');
+
+        $response = $manager->checkToken($payload, $request);
+
+        self::assertNotNull($response);
+        $location = $response->headers->get('Location');
+        self::assertNotNull($location);
+        // should fall back to path since empty string is not a valid URL
+        self::assertStringStartsWith('/', $location);
+    }
+}

tests/Unit/Trait/CookieNameTraitTest.php

@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Trait;
+
+use App\Trait\CookieNameTrait;
+use PHPUnit\Framework\TestCase;
+
+final class CookieNameTraitTest extends TestCase {
+    use CookieNameTrait;
+
+    public function testCookieName(): void {
+        self::assertSame('__Host-Http-Preauth', $this->cookieName());
+    }
+
+    public function testAuthCookieName(): void {
+        self::assertSame('__Http-Domain-Preauth', $this->authCookieName());
+    }
+
+    public function testHeaderName(): void {
+        self::assertSame('X-Preauth', $this->headerName());
+    }
+}

tests/Unit/Trait/GetTotpTraitTest.php

@@ -0,0 +1,90 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Trait;
+
+use App\ConfigBag;
+use App\Tests\Support\TotpTestHelper;
+use App\Trait\GetTotpTrait;
+use OTPHP\TOTPInterface;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+final class GetTotpTraitTest extends TestCase {
+    use TotpTestHelper;
+
+    private function makeObject(): object {
+        return new class {
+            use GetTotpTrait;
+
+            public function publicGetTotp(): TOTPInterface {
+                return $this->getTotp();
+            }
+        };
+    }
+
+    public function testSetConfigSetsProperty(): void {
+        $obj = $this->makeObject();
+        $config = $this->makeConfig();
+
+        $obj->setConfig($config);
+
+        $reflection = new \ReflectionProperty($obj, 'config');
+        self::assertSame($config, $reflection->getValue($obj));
+    }
+
+    public function testGetTotpReturnsTotpInterface(): void {
+        $obj = $this->makeObject();
+        $obj->setConfig($this->makeConfig());
+
+        $totp = $obj->publicGetTotp();
+
+        self::assertInstanceOf(TOTPInterface::class, $totp);
+    }
+
+    public function testGetTotpReturnsValidCode(): void {
+        $obj = $this->makeObject();
+        $obj->setConfig($this->makeConfig());
+
+        $totp = $obj->publicGetTotp();
+
+        // the code at the frozen time should match our helper
+        self::assertSame($this->validTotpCode(), $totp->now());
+    }
+
+    public function testGetTotpThrowsOnInvalidUri(): void {
+        $obj = $this->makeObject();
+        $clock = $this->frozenClock();
+        $utilities = $this->createUtilities($clock);
+        $config = new ConfigBag(
+            $utilities, $clock,
+            3600, 'not-a-valid-uri', 0, false,
+            'Error', 'Teapot', 'Too Many'
+        );
+        $obj->setConfig($config);
+
+        // Factory::loadFromProvisioningUri throws InvalidProvisioningUriException
+        // which is not caught by getTotp() since the instanceof check only runs
+        // after a successful load — so we expect a Throwable here
+        $this->expectException(\Throwable::class);
+        $obj->publicGetTotp();
+    }
+
+    public function testGetTotpThrowsHttpExceptionWhenNotTotpType(): void {
+        // A HOTP URI loads successfully as an OTPInterface but is NOT a TOTPInterface,
+        // so the instanceof check in getTotp() should throw an HttpException(500)
+        $obj = $this->makeObject();
+        $clock = $this->frozenClock();
+        $utilities = $this->createUtilities($clock);
+        $config = new ConfigBag(
+            $utilities, $clock,
+            3600, 'otpauth://hotp/Test-HOTP?secret=JBSWY3DPEHPK3PXP&counter=0', 0, false,
+            'Error', 'Teapot', 'Too Many'
+        );
+        $obj->setConfig($config);
+
+        $this->expectException(HttpException::class);
+        $this->expectExceptionMessage('Internal Server Exception');
+        $obj->publicGetTotp();
+    }
+}

tests/Unit/Trait/HasLoggerTraitTest.php

@@ -0,0 +1,18 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Trait;
+
+use App\Trait\HasLoggerTrait;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+
+final class HasLoggerTraitTest extends TestCase {
+    use HasLoggerTrait;
+
+    public function testSetLogger(): void {
+        $logger = $this->createStub(LoggerInterface::class);
+        $this->setLogger($logger);
+        self::assertSame($logger, $this->logger);
+    }
+}

tests/Unit/Trait/MakeNonceTraitTest.php

@@ -0,0 +1,176 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Trait;
+
+use App\Trait\MakeNonceTrait;
+use PHPUnit\Framework\TestCase;
+use Psr\Cache\CacheItemInterface;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\Log\NullLogger;
+use Symfony\Component\Cache\Adapter\ArrayAdapter;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+/**
+ * Wraps the trait in a concrete class with public proxies so the protected
+ * methods can be exercised from test scope.
+ */
+final class MakeNonceTraitTest extends TestCase {
+    private function makeObject(): object {
+        return new class {
+            use MakeNonceTrait;
+
+            public function publicMakeNonce(int $retries = 3): string {
+                return $this->makeNonce($retries);
+            }
+
+            public function publicMakeCacheKey(string $name): string {
+                return $this->makeCacheKey($name);
+            }
+        };
+    }
+
+    public function testMakeNonceReturnsBase64UrlString(): void {
+        $obj = $this->makeObject();
+        $obj->setLogger(new NullLogger());
+        $obj->setNonceCache(new ArrayAdapter());
+
+        $nonce = $obj->publicMakeNonce();
+
+        self::assertIsString($nonce);
+        // 15 bytes -> 20 base64 chars without padding
+        self::assertSame(20, strlen($nonce));
+        // base64url charset only
+        self::assertMatchesRegularExpression('/^[A-Za-z0-9_-]+$/', $nonce);
+    }
+
+    public function testMakeNonceStoresNonceInCache(): void {
+        $pool = new ArrayAdapter();
+        $obj = $this->makeObject();
+        $obj->setLogger(new NullLogger());
+        $obj->setNonceCache($pool);
+
+        $nonce = $obj->publicMakeNonce();
+
+        // makeNonce stores via makeCacheKey() which rewrites '-' to '_'
+        $key = $obj->publicMakeCacheKey($nonce);
+        self::assertTrue($pool->hasItem($key));
+        $item = $pool->getItem($key);
+        self::assertTrue($item->get());
+    }
+
+    public function testMakeNonceSetsExpiry(): void {
+        $pool = new ArrayAdapter();
+        $obj = $this->makeObject();
+        $obj->setLogger(new NullLogger());
+        $obj->setNonceCache($pool);
+
+        $nonce = $obj->publicMakeNonce();
+
+        $item = $pool->getItem($obj->publicMakeCacheKey($nonce));
+        $expiry = $item->getMetadata()['expiry'];
+        // NONCE_TTL is 120 seconds
+        self::assertLessThanOrEqual(120, (int) $expiry - time());
+        self::assertGreaterThan(time(), (int) $expiry);
+    }
+
+    public function testTwoNoncesAreDifferent(): void {
+        $pool = new ArrayAdapter();
+        $obj = $this->makeObject();
+        $obj->setLogger(new NullLogger());
+        $obj->setNonceCache($pool);
+
+        $nonce1 = $obj->publicMakeNonce();
+        $nonce2 = $obj->publicMakeNonce();
+
+        self::assertNotSame($nonce1, $nonce2);
+    }
+
+    public function testMakeNonceThrowsAfterMaxRetries(): void {
+        // Create a stub pool that always reports every key as a hit (collision)
+        $pool = $this->createStub(CacheItemPoolInterface::class);
+        $item = $this->createStub(CacheItemInterface::class);
+        $item->method('isHit')->willReturn(true);
+        $item->method('get')->willReturn(true);
+        $pool->method('getItem')->willReturn($item);
+        $pool->method('save')->willReturn(true);
+
+        $obj = $this->makeObject();
+        $obj->setLogger(new NullLogger());
+        $obj->setNonceCache($pool);
+
+        $this->expectException(HttpException::class);
+        $this->expectExceptionMessage('Internal Server Error');
+
+        $obj->publicMakeNonce();
+    }
+
+    public function testMakeNonceRetriesAndSucceedsAfterCollision(): void {
+        // Use a spy pool that returns isHit=true on the first getItem call
+        // (simulating a collision), then delegates to a real ArrayAdapter for
+        // subsequent calls so the retry succeeds.
+        $realPool = new ArrayAdapter();
+        $collisionCount = 0;
+
+        $spyPool = new class($realPool, $collisionCount) implements CacheItemPoolInterface {
+            private int $hits = 0;
+            public function __construct(
+                private CacheItemPoolInterface $inner,
+                private int &$hitCounter,
+            ) {}
+
+            public function getItem(string $key): CacheItemInterface {
+                $item = $this->inner->getItem($key);
+                // pretend the first requested key is already a hit (collision)
+                if ($this->hits === 0) {
+                    $this->hits++;
+                    $this->hitCounter++;
+                    return new class($key) implements CacheItemInterface {
+                        public function __construct(private string $key) {}
+                        public function getKey(): string { return $this->key; }
+                        public function get(): mixed { return true; }
+                        public function isHit(): bool { return true; }
+                        public function set(mixed $value): static { return $this; }
+                        public function expiresAt(?\DateTimeInterface $expiration): static { return $this; }
+                        public function expiresAfter(int|\DateInterval|null $time): static { return $this; }
+                    };
+                }
+                return $item;
+            }
+            public function getItems(array $keys = []): iterable { return $this->inner->getItems($keys); }
+            public function hasItem(string $key): bool { return $this->inner->hasItem($key); }
+            public function clear(): bool { return $this->inner->clear(); }
+            public function deleteItem(string $key): bool { return $this->inner->deleteItem($key); }
+            public function deleteItems(array $keys): bool { return $this->inner->deleteItems($keys); }
+            public function save(CacheItemInterface $item): bool { return $this->inner->save($item); }
+            public function saveDeferred(CacheItemInterface $item): bool { return $this->inner->saveDeferred($item); }
+            public function commit(): bool { return $this->inner->commit(); }
+        };
+
+        $obj = $this->makeObject();
+        $obj->setLogger(new NullLogger());
+        $obj->setNonceCache($spyPool);
+
+        // should retry and succeed on the second attempt
+        $nonce = $obj->publicMakeNonce();
+        self::assertIsString($nonce);
+        self::assertSame(20, strlen($nonce));
+        self::assertSame(1, $collisionCount, 'Expected exactly one collision before success');
+    }
+
+    public function testMakeNonceThrowsImmediatelyWithZeroRetries(): void {
+        $pool = $this->createStub(CacheItemPoolInterface::class);
+        $item = $this->createStub(CacheItemInterface::class);
+        $item->method('isHit')->willReturn(true);
+        $item->method('get')->willReturn(true);
+        $pool->method('getItem')->willReturn($item);
+        $pool->method('save')->willReturn(true);
+
+        $obj = $this->makeObject();
+        $obj->setLogger(new NullLogger());
+        $obj->setNonceCache($pool);
+
+        $this->expectException(HttpException::class);
+        $obj->publicMakeNonce(0);
+    }
+}

tests/Unit/Trait/StringTraitTest.php

@@ -0,0 +1,60 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Trait;
+
+use App\Trait\StringTrait;
+use PHPUnit\Framework\TestCase;
+
+final class StringTraitTest extends TestCase {
+    use StringTrait;
+
+    public function testMakeCacheKeySanitizesInvalidChars(): void {
+        self::assertSame('hello_world', $this->makeCacheKey('hello world'));
+        self::assertSame('hello_world', $this->makeCacheKey('hello!world'));
+        self::assertSame('a_b_c_d', $this->makeCacheKey('a/b@c#d'));
+    }
+
+    public function testMakeCacheKeyPreservesValidChars(): void {
+        self::assertSame('ABC_123.abc', $this->makeCacheKey('ABC_123.abc'));
+    }
+
+    public function testMakeCacheKeyTruncatesLongNames(): void {
+        $long = str_repeat('a', 300);
+        $result = $this->makeCacheKey($long);
+        self::assertSame(128, mb_strlen($result));
+    }
+
+    public function testMakeCacheKeyEmptyString(): void {
+        self::assertSame('', $this->makeCacheKey(''));
+    }
+
+    public function testMakeCacheKeyWithOnlyInvalidChars(): void {
+        // preg_replace with + collapses consecutive invalid chars into one _
+        self::assertSame('_', $this->makeCacheKey('!!!'));
+        self::assertSame('_', $this->makeCacheKey('   '));
+        self::assertSame('_', $this->makeCacheKey('!@#'));
+        self::assertSame('_', $this->makeCacheKey('!@ #'));
+    }
+
+    public function testMakeCacheKeyTruncatesToExactly128(): void {
+        $input = str_repeat('a', 128);
+        self::assertSame(128, mb_strlen($this->makeCacheKey($input)));
+        self::assertSame($input, $this->makeCacheKey($input));
+
+        $input129 = str_repeat('a', 129);
+        self::assertSame(128, mb_strlen($this->makeCacheKey($input129)));
+    }
+
+    public function testMakeCacheKeyWithMultibyteChars(): void {
+        // multibyte chars are replaced with a single underscore
+        $result = $this->makeCacheKey('héllo wörld');
+        // é and ö are not in [A-Za-z0-9_.] so they become _
+        self::assertSame('h_llo_w_rld', $result);
+    }
+
+    public function testMakeCacheKeyWithEmoji(): void {
+        $result = $this->makeCacheKey('a🎉b');
+        self::assertSame('a_b', $result);
+    }
+}