disable db container, not used

.gitignore

@@ -3,11 +3,5 @@
 !/app/.keep
 
 # Uncomment to ignore Database datas
-data
+/data/*
-
+!/data/.keep
-# yarn
-/app/.yarncache
-
-
-# phpstorm
-.idea

README.md

@@ -1,111 +1,26 @@
 Environnement de développement Docker pour démarrer un nouveau projet Symfony5
 ==================================
 
-## En partant de la branche *5_start_new-project*
+# Présentation
 
-Le projet, symfony et ses dépendances sont prêt à être installé.
+L'objectif de ce dépôt est de proposer et de faire évoluer une configuration de départ pour démarrer très simplement un nouveau projet Symfony dans des conteneurs Docker.
 
-```
+En suivant pas-à-pas les instructions à partir du chapitre "Installation", on peut démarrer en quelques minutes un nouveau projet.
-$ docker-compose build
-$ docker-compose up -d
-$ docker-compose exec -u 1000 php bash
-```
 
-dans le conteneur php :
+Le dépôt propose plusieurs branches qui peuvent être utilisées selon le point de départ recherché:
 
-```
+## 1_docker_ready
-$ composer install
-$ bin/console doctrine:schema:create
-```
 
-et pour node :
+La branche `1_docker_ready` fournit juste le docker-compose.yml et les Dockerfile qui permettent de construire les conteneurs.
 
-```
+* `$ cd my-project-dir`
-$ bash docker-node.sh yarn install --force
+* `$ docker-compose build`
-$ bash docker-node.sh yarn encore dev-server
+* `$ docker-compose up -d`
-```
+* `$ docker-compose exec -u 1000 php bash`
 
-Voilà, le site est disponible sur http://localhost:8000
+A ce stade les commandes `composer` et `symfony` sont disponibles pour lancer la création du projet.
+Après ça on choisira dans le fichier `app/.env` le type de base de donnée. Un conteneur est prévu pour utiliser postgresql.
 
+## 2_symfony_demo
 
-## En partant de la branche *1_docker_ready*
+Cette branche démarre d'une installation toute prête de la demo Symfony. La db est enregistrée dans le repo dans un simple fichier sqlite (`app/data/database.sqlite`). Le conteneur docker postgresql est donc désactivé.
-
-### 1. Se mettre sur la bonne branche
-
-```bash
-$ git co -b 1_docker_ready origin/1_docker_ready
-```
-
-### 2. Construire les images et les conteneurs
-
-```bash
-$ docker-compose build
-$ docker-compose up
- .. 221001_test3_db_1 exited with code 1
-```
-
-### 3. Parce que 'db' ne se lance pas:
-
-```bash
-$ docker-compose rm db
-$ sudo rm -rf ./data
-$ docker-compose up db
-```
-
-### 4. Entrer dans le conteneur php
-
-```bash
-$ docker-compose exec -u 1000 php bash
-```
-
-### 5. Créer le projet
-
-```bash
-$ symfony new project
-$ mv project/* . && mv project/.* . && rmdir project
-```
-
-### 6. Charger les dépendances de composer
-
-```bash
-$ composer require doctrine/annotations twig/twig doctrine/orm symfony/orm-pack symfony/form symfony/maker-bundle symfony/security-csrf
-```
-
-### 7. Connexion à postgresql
-
-modifier DATABASE_URL dans app/.env :
-```bash
-+++ DATABASE_URL="postgresql://postgres:secret@db:5432/postgres?serverVersion=12&charset=utf8"
-```
-
-et dans le conteneur php :
-```bash
-$ bin/console doctrine:schema:create
-```
-
-### 8. Chargement de dépendances, la suite
-
-```bash
-$ composer require symfony/yaml symfony/twig-bridge symfony/validator
-
-$ composer require symfony/asset symfony/expression-language symfony/security-http symfony/translation symfony/web-link egulias/email-validator symfony/expression-language symfony/intl symfony/translation
-
-$ composer require --dev symfony/profiler-pack symfony/debug-bundle symfony/var-dumper
-```
-
-### 9. Installer node et yarn
-
-```bash
-$ composer require symfony/webpack-encore-bundle
-```
-
-mettre en place le script qui lance docker node, le lancer pour entrer dans le conteneur node:
-```bash
-$ yarn install --force
-$ yarn add sass sass-loader
-$ yarn encore dev-server
-```
-
-### 10. C'est installé !
-
-le site est disponible sur http://localhost:8000

app/.editorconfig

@@ -0,0 +1,10 @@
+; top-most EditorConfig file
+root = true
+
+; Unix-style newlines
+[*]
+end_of_line = LF
+
+[*.php]
+indent_style = space
+indent_size = 4

app/.env

@@ -9,21 +9,25 @@
 # Real environment variables win over .env files.
 #
 # DO NOT DEFINE PRODUCTION SECRETS IN THIS FILE NOR IN ANY OTHER COMMITTED FILES.
-# https://symfony.com/doc/current/configuration/secrets.html
 #
 # Run "composer dump-env prod" to compile .env files for production use (requires symfony/flex >=1.2).
 # https://symfony.com/doc/current/best_practices.html#use-environment-variables-for-infrastructure-configuration
 
 ###> symfony/framework-bundle ###
 APP_ENV=dev
-APP_SECRET=0751e183ea472eb11c19f21f66a2543c
+APP_SECRET=2ca64f8d83b9e89f5f19d672841d6bb8
+#TRUSTED_PROXIES=127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16
+#TRUSTED_HOSTS='^(localhost|example\.com)$'
 ###< symfony/framework-bundle ###
 
 ###> doctrine/doctrine-bundle ###
 # Format described at https://www.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/configuration.html#connecting-using-a-url
+# For a MySQL database, use: "mysql://db_user:db_password@127.0.0.1:3306/db_name"
+# For a PostgreSQL database, use: "postgresql://db_user:db_password@127.0.0.1:5432/db_name?serverVersion=11&charset=utf8"
 # IMPORTANT: You MUST configure your server version, either here or in config/packages/doctrine.yaml
-#
+DATABASE_URL=sqlite:///%kernel.project_dir%/data/database.sqlite
-# DATABASE_URL="sqlite:///%kernel.project_dir%/var/data.db"
-# DATABASE_URL="mysql://app:!ChangeMe!@127.0.0.1:3306/app?serverVersion=8&charset=utf8mb4"
-DATABASE_URL="postgresql://app:!ChangeMe!@127.0.0.1:5432/app?serverVersion=15&charset=utf8"
 ###< doctrine/doctrine-bundle ###
+
+###> symfony/mailer ###
+# MAILER_DSN=smtp://localhost
+###< symfony/mailer ###

app/.env.test

@@ -0,0 +1,6 @@
+# define your env variables for the test env here
+KERNEL_CLASS='App\Kernel'
+APP_SECRET='$ecretf0rt3st'
+SYMFONY_DEPRECATIONS_HELPER=999999
+PANTHER_APP_ENV=panther
+DATABASE_URL=sqlite:///%kernel.project_dir%/data/database_test.sqlite

app/.github/workflows/ci.yaml

@@ -0,0 +1,80 @@
+name: "CI"
+
+on:
+    pull_request:
+    push:
+        branches:
+            - 'master'
+
+env:
+    fail-fast: true
+    PHPUNIT_FLAGS: "-v"
+    SYMFONY_PHPUNIT_DIR: "$HOME/symfony-bridge/.phpunit"
+    SYMFONY_REQUIRE: ">=4.4"
+    # 40x: Since symfony/monolog-bridge 5.2:
+    # Passing an actionLevel (int|string) as constructor's 3rd argument of
+    # "Symfony\Bridge\Monolog\Handler\FingersCrossed\HttpCodeActivationStrategy"
+    # is deprecated, "Monolog\Handler\FingersCrossed\ActivationStrategyInterface" expected.
+    SYMFONY_DEPRECATIONS_HELPER: 40
+
+jobs:
+    test:
+        name: "${{ matrix.operating-system }} / PHP ${{ matrix.php-version }}"
+        runs-on: ${{ matrix.operating-system }}
+        continue-on-error: false
+
+        strategy:
+            matrix:
+                operating-system: ['ubuntu-latest', 'windows-latest', 'macos-latest']
+                php-version: ['7.2.9', '7.3', '7.4', '8.0']
+
+        steps:
+            - name: "Checkout code"
+              uses: actions/checkout@v2.3.3
+
+            - name: "Install PHP with extensions"
+              uses: shivammathur/setup-php@2.7.0
+              with:
+                  coverage: "none"
+                  extensions: "intl, mbstring, pdo_sqlite"
+                  php-version: ${{ matrix.php-version }}
+                  tools: composer:v2
+
+            - name: "Add PHPUnit matcher"
+              run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+
+            - name: "Set composer cache directory"
+              id: composer-cache
+              run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+            - name: "Cache composer"
+              uses: actions/cache@v2.1.2
+              with:
+                  path: ${{ steps.composer-cache.outputs.dir }}
+                  key: ${{ runner.os }}-${{ matrix.php-version }}-composer-${{ hashFiles('composer.json') }}
+                  restore-keys: ${{ runner.os }}-${{ matrix.php-version }}-composer-
+
+            - name: "Require symfony/flex"
+              run: composer global require --no-progress --no-scripts --no-plugins symfony/flex dev-main
+
+            - if: matrix.php-version != '8.0'
+              run: composer update
+
+            - if: matrix.php-version == '8.0'
+              run: composer update --ignore-platform-req=php
+
+            - if: matrix.php-version != '8.0' 
+              name: "Install PHPUnit"
+              run: vendor/bin/simple-phpunit install
+
+            - if: matrix.php-version == '8.0'
+              name: "Install PHPUnit for PHP 8"
+              run: |
+                echo 'SYMFONY_PHPUNIT_VERSION=9.4' >> $GITHUB_ENV
+                vendor/bin/simple-phpunit install
+
+            - name: "PHPUnit version"
+              run: vendor/bin/simple-phpunit --version
+
+            - name: "Run tests"
+              run: vendor/bin/simple-phpunit ${{ env.PHPUNIT_FLAGS }}

app/.github/workflows/lint.yaml

@@ -0,0 +1,88 @@
+name: "Lint"
+
+on: [push, pull_request]
+
+env:
+    fail-fast: true
+
+jobs:
+    php-cs-fixer:
+        name: PHP-CS-Fixer
+        runs-on: ubuntu-latest
+        steps:
+            - name: "Checkout code"
+              uses: actions/checkout@v2
+
+            - name: PHP-CS-Fixer
+              uses: docker://oskarstark/php-cs-fixer-ga
+              with:
+                  args: --diff --dry-run
+
+    linters:
+        name: Linters
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php-version: ['7.4']
+
+        steps:
+            - name: "Checkout code"
+              uses: actions/checkout@v2.3.3
+
+            - name: "Install PHP with extensions"
+              uses: shivammathur/setup-php@2.7.0
+              with:
+                  coverage: "none"
+                  extensions: intl
+                  php-version: ${{ matrix.php-version }}
+                  tools: composer:v2
+
+            - name: "Set composer cache directory"
+              id: composer-cache
+              run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+            - name: "Cache composer"
+              uses: actions/cache@v2.1.2
+              with:
+                  path: ${{ steps.composer-cache.outputs.dir }}
+                  key: ${{ runner.os }}-${{ matrix.php-version }}-composer-${{ hashFiles('composer.json') }}
+                  restore-keys: ${{ runner.os }}-${{ matrix.php-version }}-composer-
+
+            - name: "Require symfony/flex"
+              run: composer global require --no-progress --no-scripts --no-plugins symfony/flex dev-main
+
+            - name: "Composer update"
+              id: install
+              run: composer update --no-scripts
+
+            - name: Lint YAML files
+              if: always() && steps.install.outcome == 'success'
+              run: ./bin/console lint:yaml config --parse-tags
+
+            - name: Lint Twig templates
+              if: always() && steps.install.outcome == 'success'
+              run: ./bin/console lint:twig templates --env=prod
+
+            - name: Lint XLIFF translations
+              if: always() && steps.install.outcome == 'success'
+              run: ./bin/console lint:xliff translations
+
+            - name: Lint Parameters and Services
+              if: always() && steps.install.outcome == 'success'
+              run: ./bin/console lint:container
+
+            - name: Lint Doctrine entities
+              if: always() && steps.install.outcome == 'success'
+              run: ./bin/console doctrine:schema:validate --skip-sync -vvv --no-interaction
+
+            - name: Lint Composer config
+              if: always() && steps.install.outcome == 'success'
+              run: composer validate --strict
+
+            - name: Download Symfony CLI
+              if: always() && steps.install.outcome == 'success'
+              run: wget https://get.symfony.com/cli/installer -O - | bash
+
+            - name: Check if any dependencies are compromised
+              if: always() && steps.install.outcome == 'success'
+              run: /home/runner/.symfony/bin/symfony check:security

app/.gitignore

@@ -1,3 +1,5 @@
+/public/build/fonts/glyphicons-*
+/public/build/images/glyphicons-*
 
 ###> symfony/framework-bundle ###
 /.env.local
@@ -9,6 +11,11 @@
 /vendor/
 ###< symfony/framework-bundle ###
 
+###> symfony/phpunit-bridge ###
+.phpunit
+.phpunit.result.cache
+/phpunit.xml
+###< symfony/phpunit-bridge ###
 ###> symfony/webpack-encore-bundle ###
 /node_modules/
 /public/build/

app/.php_cs.dist

@@ -0,0 +1,42 @@
+<?php
+
+$fileHeaderComment = <<<COMMENT
+This file is part of the Symfony package.
+
+(c) Fabien Potencier <fabien@symfony.com>
+
+For the full copyright and license information, please view the LICENSE
+file that was distributed with this source code.
+COMMENT;
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__)
+    ->exclude('config')
+    ->exclude('var')
+    ->exclude('public/bundles')
+    ->exclude('public/build')
+    // exclude files generated by Symfony Flex recipes
+    ->notPath('bin/console')
+    ->notPath('public/index.php')
+;
+
+return (new PhpCsFixer\Config())
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@Symfony' => true,
+        '@Symfony:risky' => true,
+        'header_comment' => ['header' => $fileHeaderComment, 'separate' => 'both'],
+        'linebreak_after_opening_tag' => true,
+        'mb_str_functions' => true,
+        'no_php4_constructor' => true,
+        'no_unreachable_default_argument_value' => true,
+        'no_useless_else' => true,
+        'no_useless_return' => true,
+        'php_unit_strict' => true,
+        'phpdoc_order' => true,
+        'strict_comparison' => true,
+        'strict_param' => true,
+    ])
+    ->setFinder($finder)
+    ->setCacheFile(__DIR__.'/var/.php_cs.cache')
+;

app/CONTRIBUTING.md

@@ -0,0 +1,7 @@
+Contributing
+============
+
+The Symfony Demo application is an open source project. Contributions made by
+the community are welcome. Send us your ideas, code reviews, pull requests and
+feature requests to help us improve this project. All contributions must follow
+the [usual Symfony contribution requirements](https://symfony.com/doc/current/contributing/index.html).

app/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2015-2020 Fabien Potencier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

app/README.md

@@ -0,0 +1,60 @@
+Symfony Demo Application
+========================
+
+The "Symfony Demo Application" is a reference application created to show how
+to develop applications following the [Symfony Best Practices][1].
+
+Requirements
+------------
+
+  * PHP 7.2.9 or higher;
+  * PDO-SQLite PHP extension enabled;
+  * and the [usual Symfony application requirements][2].
+
+Installation
+------------
+
+[Download Symfony][4] to install the `symfony` binary on your computer and run
+this command:
+
+```bash
+$ symfony new --demo my_project
+```
+
+Alternatively, you can use Composer:
+
+```bash
+$ composer create-project symfony/symfony-demo my_project
+```
+
+Usage
+-----
+
+There's no need to configure anything to run the application. If you have
+[installed Symfony][4] binary, run this command:
+
+```bash
+$ cd my_project/
+$ symfony serve
+```
+
+Then access the application in your browser at the given URL (<https://localhost:8000> by default).
+
+If you don't have the Symfony binary installed, run `php -S localhost:8000 -t public/`
+to use the built-in PHP web server or [configure a web server][3] like Nginx or
+Apache to run the application.
+
+Tests
+-----
+
+Execute this command to run tests:
+
+```bash
+$ cd my_project/
+$ ./bin/phpunit
+```
+
+[1]: https://symfony.com/doc/current/best_practices.html
+[2]: https://symfony.com/doc/current/reference/requirements.html
+[3]: https://symfony.com/doc/current/cookbook/configuration/web_server_configuration.html
+[4]: https://symfony.com/download

app/assets/app.js

@@ -1,12 +0,0 @@
-/*
- * Welcome to your app's main JavaScript file!
- *
- * We recommend including the built version of this JavaScript file
- * (and its CSS file) in your base layout (base.html.twig).
- */
-
-// any CSS you import will output into a single css file (app.css in this case)
-import './styles/app.css';
-
-// start the Stimulus application
-import './bootstrap';

app/assets/bootstrap.js

@@ -1,11 +0,0 @@
-import { startStimulusApp } from '@symfony/stimulus-bridge';
-
-// Registers Stimulus controllers from controllers.json and in the controllers/ directory
-export const app = startStimulusApp(require.context(
-    '@symfony/stimulus-bridge/lazy-controller-loader!./controllers',
-    true,
-    /\.[jt]sx?$/
-));
-
-// register any custom, 3rd party controllers here
-// app.register('some_controller_name', SomeImportedController);

app/assets/controllers.json

@@ -1,4 +0,0 @@
-{
-    "controllers": [],
-    "entrypoints": []
-}

app/assets/controllers/hello_controller.js

@@ -1,16 +0,0 @@
-import { Controller } from '@hotwired/stimulus';
-
-/*
- * This is an example Stimulus controller!
- *
- * Any element with a data-controller="hello" attribute will cause
- * this controller to be executed. The name "hello" comes from the filename:
- * hello_controller.js -> "hello"
- *
- * Delete this file or adapt it for your use!
- */
-export default class extends Controller {
-    connect() {
-        this.element.textContent = 'Hello Stimulus! Edit me in assets/controllers/hello_controller.js';
-    }
-}

app/assets/js/admin.js

@@ -0,0 +1,64 @@
+import '../scss/admin.scss';
+import 'eonasdan-bootstrap-datetimepicker';
+import 'typeahead.js';
+import Bloodhound from "bloodhound-js";
+import 'bootstrap-tagsinput';
+
+$(function() {
+    // Datetime picker initialization.
+    // See https://eonasdan.github.io/bootstrap-datetimepicker/
+    $('[data-toggle="datetimepicker"]').datetimepicker({
+        icons: {
+            time: 'fa fa-clock-o',
+            date: 'fa fa-calendar',
+            up: 'fa fa-chevron-up',
+            down: 'fa fa-chevron-down',
+            previous: 'fa fa-chevron-left',
+            next: 'fa fa-chevron-right',
+            today: 'fa fa-check-circle-o',
+            clear: 'fa fa-trash',
+            close: 'fa fa-remove'
+        }
+    });
+
+    // Bootstrap-tagsinput initialization
+    // https://bootstrap-tagsinput.github.io/bootstrap-tagsinput/examples/
+    var $input = $('input[data-toggle="tagsinput"]');
+    if ($input.length) {
+        var source = new Bloodhound({
+            local: $input.data('tags'),
+            queryTokenizer: Bloodhound.tokenizers.whitespace,
+            datumTokenizer: Bloodhound.tokenizers.whitespace
+        });
+        source.initialize();
+
+        $input.tagsinput({
+            trimValue: true,
+            focusClass: 'focus',
+            typeaheadjs: {
+                name: 'tags',
+                source: source.ttAdapter()
+            }
+        });
+    }
+});
+
+// Handling the modal confirmation message.
+$(document).on('submit', 'form[data-confirmation]', function (event) {
+    var $form = $(this),
+        $confirm = $('#confirmationModal');
+
+    if ($confirm.data('result') !== 'yes') {
+        //cancel submit event
+        event.preventDefault();
+
+        $confirm
+            .off('click', '#btnYes')
+            .on('click', '#btnYes', function () {
+                $confirm.data('result', 'yes');
+                $form.find('input[type="submit"]').attr('disabled', 'disabled');
+                $form.submit();
+            })
+            .modal('show');
+    }
+});

app/assets/js/app.js

@@ -0,0 +1,15 @@
+import '../scss/app.scss';
+
+// loads the Bootstrap jQuery plugins
+import 'bootstrap-sass/assets/javascripts/bootstrap/transition.js';
+import 'bootstrap-sass/assets/javascripts/bootstrap/alert.js';
+import 'bootstrap-sass/assets/javascripts/bootstrap/collapse.js';
+import 'bootstrap-sass/assets/javascripts/bootstrap/dropdown.js';
+import 'bootstrap-sass/assets/javascripts/bootstrap/modal.js';
+import 'jquery'
+
+// loads the code syntax highlighting library
+import './highlight.js';
+
+// Creates links to the Symfony documentation
+import './doclinks.js';

app/assets/js/doclinks.js

@@ -0,0 +1,58 @@
+'use strict';
+
+// Wraps some elements in anchor tags referencing to the Symfony documentation
+$(function() {
+    var $modal = $('#sourceCodeModal');
+    var $controllerCode = $modal.find('code.php');
+    var $templateCode = $modal.find('code.twig');
+
+    function anchor(url, content) {
+        return '<a class="doclink" target="_blank" href="' + url + '">' + content + '</a>';
+    };
+
+    // Wraps links to the Symfony documentation
+    $modal.find('.hljs-comment').each(function() {
+        $(this).html($(this).html().replace(/https:\/\/symfony.com\/doc\/[\w/.#-]+/g, function(url) {
+            return anchor(url, url);
+        }));
+    });
+
+    // Wraps Symfony's annotations
+    var annotations = {
+        '@Cache': 'https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/cache.html',
+        '@IsGranted': 'https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/security.html#isgranted',
+        '@ParamConverter': 'https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/converters.html',
+        '@Route': 'https://symfony.com/doc/current/routing.html#creating-routes-as-annotations',
+        '@Security': 'https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/security.html#security'
+    };
+
+    $controllerCode.find('.hljs-doctag').each(function() {
+        var annotation = $(this).text();
+
+        if (annotations[annotation]) {
+            $(this).html(anchor(annotations[annotation], annotation));
+        }
+    });
+
+    // Wraps Twig's tags
+    $templateCode.find('.hljs-template-tag > .hljs-name').each(function() {
+        var tag = $(this).text();
+
+        if ('else' === tag || tag.match(/^end/)) {
+            return;
+        }
+
+        var url = 'https://twig.symfony.com/doc/3.x/tags/' + tag + '.html#' + tag;
+
+        $(this).html(anchor(url, tag));
+    });
+
+    // Wraps Twig's functions
+    $templateCode.find('.hljs-template-variable > .hljs-name').each(function() {
+        var func = $(this).text();
+
+        var url = 'https://twig.symfony.com/doc/3.x/functions/' + func + '.html#' + func;
+
+        $(this).html(anchor(url, func));
+    });
+});

app/assets/js/highlight.js

@@ -0,0 +1,8 @@
+import hljs from 'highlight.js/lib/highlight';
+import php from 'highlight.js/lib/languages/php';
+import twig from 'highlight.js/lib/languages/twig';
+
+hljs.registerLanguage('php', php);
+hljs.registerLanguage('twig', twig);
+
+hljs.initHighlightingOnLoad();

app/assets/js/jquery.instantSearch.js

@@ -0,0 +1,106 @@
+/**
+ * jQuery plugin for an instant searching.
+ *
+ * @author Oleg Voronkovich <oleg-voronkovich@yandex.ru>
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+(function ($) {
+    'use strict';
+
+    String.prototype.render = function (parameters) {
+        return this.replace(/({{ (\w+) }})/g, function (match, pattern, name) {
+            return parameters[name];
+        })
+    };
+
+    // INSTANTS SEARCH PUBLIC CLASS DEFINITION
+    // =======================================
+
+    var InstantSearch = function (element, options) {
+        this.$input = $(element);
+        this.$form = this.$input.closest('form');
+        this.$preview = $('<ul class="search-preview list-group">').appendTo(this.$form);
+        this.options = $.extend({}, InstantSearch.DEFAULTS, this.$input.data(), options);
+
+        this.$input.keyup(this.debounce());
+    };
+
+    InstantSearch.DEFAULTS = {
+        minQueryLength: 2,
+        limit: 10,
+        delay: 500,
+        noResultsMessage: 'No results found',
+        itemTemplate: '\
+                <article class="post">\
+                    <h2><a href="{{ url }}">{{ title }}</a></h2>\
+                    <p class="post-metadata">\
+                       <span class="metadata"><i class="fa fa-calendar"></i> {{ date }}</span>\
+                       <span class="metadata"><i class="fa fa-user"></i> {{ author }}</span>\
+                    </p>\
+                    <p>{{ summary }}</p>\
+                </article>'
+    };
+
+    InstantSearch.prototype.debounce = function () {
+        var delay = this.options.delay;
+        var search = this.search;
+        var timer = null;
+        var self = this;
+
+        return function () {
+            clearTimeout(timer);
+            timer = setTimeout(function () {
+                search.apply(self);
+            }, delay);
+        };
+    };
+
+    InstantSearch.prototype.search = function () {
+        var query = $.trim(this.$input.val()).replace(/\s{2,}/g, ' ');
+        if (query.length < this.options.minQueryLength) {
+            this.$preview.empty();
+            return;
+        }
+
+        var self = this;
+        var data = this.$form.serializeArray();
+        data['l'] = this.limit;
+
+        $.getJSON(this.$form.attr('action'), data, function (items) {
+            self.show(items);
+        });
+    };
+
+    InstantSearch.prototype.show = function (items) {
+        var $preview = this.$preview;
+        var itemTemplate = this.options.itemTemplate;
+
+        if (0 === items.length) {
+            $preview.html(this.options.noResultsMessage);
+        } else {
+            $preview.empty();
+            $.each(items, function (index, item) {
+                $preview.append(itemTemplate.render(item));
+            });
+        }
+    };
+
+    // INSTANTS SEARCH PLUGIN DEFINITION
+    // =================================
+
+    function Plugin(option) {
+        return this.each(function () {
+            var $this = $(this);
+            var instance = $this.data('instantSearch');
+            var options = typeof option === 'object' && option;
+
+            if (!instance) $this.data('instantSearch', (instance = new InstantSearch(this, options)));
+
+            if (option === 'search') instance.search();
+        })
+    }
+
+    $.fn.instantSearch = Plugin;
+    $.fn.instantSearch.Constructor = InstantSearch;
+
+})(window.jQuery);

app/assets/js/login.js

@@ -0,0 +1,11 @@
+$(function() {
+    var usernameEl = $('#username');
+    var passwordEl = $('#password');
+
+    // in a real application, the user/password should never be hardcoded
+    // but for the demo application it's very convenient to do so
+    if (!usernameEl.val() || 'jane_admin' === usernameEl.val()) {
+        usernameEl.val('jane_admin');
+        passwordEl.val('kitten');
+    }
+});

app/assets/js/search.js

@@ -0,0 +1,9 @@
+import './jquery.instantSearch.js';
+
+$(function() {
+    $('.search-field')
+        .instantSearch({
+            delay: 100,
+        })
+        .keyup();
+});

app/assets/scss/admin.scss

@@ -0,0 +1,26 @@
+@import "~bootswatch/flatly/variables";
+@import "~eonasdan-bootstrap-datetimepicker/src/sass/bootstrap-datetimepicker-build.scss";
+@import "bootstrap-tagsinput.scss";
+
+/* Page: 'Backend post index'
+   ------------------------------------------------------------------------- */
+body#admin_post_index .item-actions {
+  white-space: nowrap
+}
+
+body#admin_post_index .item-actions a.btn + a.btn {
+  margin-left: 4px
+}
+
+/* Page: 'Backend post show'
+   ------------------------------------------------------------------------- */
+body#admin_post_show .post-tags .label-default {
+  background-color: #e9ecec;
+  color: #6D8283;
+  font-size: 16px;
+  margin-right: 10px;
+  padding: .4em 1em .5em;
+}
+body#admin_post_show .post-tags .label-default i {
+  color: #95A6A7;
+}

app/assets/scss/app.scss

@@ -0,0 +1,360 @@
+// setting the value of this variable to an empty data URL is the only working solution
+// to load the Bootswatch web fonts locally and avoid loading them from Google servers
+// see https://github.com/thomaspark/bootswatch/issues/55#issuecomment-298093182
+$web-font-path: 'data:text/css;base64,';
+
+// Make sure the bootstrap-sass and lato fonts are resolved correctly
+$icon-font-path: "~bootstrap-sass/assets/fonts/bootstrap/";
+$lato-font-path: '~lato-font/fonts';
+
+@import "~bootswatch/flatly/variables";
+@import "~bootstrap-sass/assets/stylesheets/bootstrap";
+@import "~bootswatch/flatly/bootswatch";
+@import "~@fortawesome/fontawesome-free/css/all.css";
+@import "~@fortawesome/fontawesome-free/css/v4-shims.css";
+@import "~highlight.js/styles/solarized-light.css";
+
+// pick the Lato fonts individually to avoid importing the entire font family
+@import '~lato-font/scss/public-api';
+@include lato-include-font('normal');
+@include lato-include-font('bold');
+
+/* Basic styles
+   ------------------------------------------------------------------------- */
+p, ul, ol {
+  font-size: 19px;
+  margin-bottom: 1.5em
+}
+
+li {
+  margin-bottom: 0.5em
+}
+
+code {
+  background: #ecf0f1;
+  color: #2c3e50
+}
+
+.text-danger, .text-danger:hover {
+  color: #e74c3c
+}
+
+i {
+  margin-right: 0.25em
+}
+
+.table.table-middle-aligned th,
+.table.table-middle-aligned td {
+  vertical-align: middle;
+}
+
+.doclink {
+    color: inherit
+}
+
+/* Utilities
+   ------------------------------------------------------------------------- */
+.m-b-0 { margin-bottom: 0 }
+
+/* Page elements
+   ------------------------------------------------------------------------- */
+body {
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh
+}
+
+header {
+  margin-bottom: 2em
+}
+
+header ul.nav li {
+  margin-bottom: 0
+}
+
+header .locales {
+  min-width: 190px;
+}
+header .locales a {
+  color: #212529;
+  padding: 3px 15px;
+}
+header .locales a small {
+  border-radius: 4px;
+  border: 2px solid #dee2e6;
+  color: #7b8a8b;
+  float: left;
+  font-size: 12px;
+  line-height: 1.1;
+  margin: 2px 10px 0 0;
+  min-width: 26px;
+  padding: 0px 3px;
+  text-align: center;
+  text-transform: uppercase;
+}
+header .locales .active small,
+header .locales a:hover small {
+  color: inherit;
+}
+
+.body-container {
+  flex: 1;
+  /* needed to prevent pages with a very small height and browsers not supporting flex */
+  min-height: 600px
+}
+
+.body-container #main h1, .body-container #main h2 {
+  margin-top: 0
+}
+
+#sidebar .section {
+  margin-bottom: 2em
+}
+
+#sidebar p {
+  font-size: 15px
+}
+
+#sidebar p + p {
+  margin: 1.5em 0 0
+}
+
+footer {
+  background: #ecf0f1;
+  margin-top: 2em;
+  padding-top: 2em;
+  padding-bottom: 2em
+}
+
+footer p {
+  color: #7b8a8b;
+  font-size: 13px;
+  margin-bottom: 0.25em
+}
+
+footer #footer-resources {
+  text-align: right
+}
+
+footer #footer-resources i {
+  color: #7b8a8b;
+  font-size: 28.5px;
+  margin-left: 0.5em
+}
+
+#sourceCodeModal h3 {
+  font-size: 19px;
+  margin-top: 0
+}
+
+#sourceCodeModal h3 small {
+  color: #7b8a8b;
+  font-size: 80%
+}
+
+#sourceCodeModal pre {
+  margin-bottom: 2em;
+  padding: 0
+}
+
+#confirmationModal .modal-dialog {
+  width: 500px
+}
+
+#confirmationModal .modal-footer button {
+  min-width: 75px
+}
+
+/* Misc. elements
+   ------------------------------------------------------------------------- */
+.section.rss a {
+  color: #f39c12;
+  font-size: 21px;
+}
+
+/* Forms
+   ------------------------------------------------------------------------- */
+.form-group.has-error .form-control {
+  border-color: #e74c3c
+}
+
+.form-group.has-error .control-label {
+  color: #e74c3c
+}
+
+.form-group.has-error .help-block {
+  background-color: #e74c3c;
+  color: #fff;
+  font-size: 15px;
+  padding: 1em
+}
+
+.form-group.has-error .help-block ul,
+.form-group.has-error .help-block li {
+  margin-bottom: 0
+}
+.form-group.has-error .help-block li + li {
+  margin-top: 0.5em;
+}
+
+textarea {
+  max-width: 100%
+}
+
+/* Page: 'Technical Requirements Checker'
+   ------------------------------------------------------------------------- */
+body#requirements_checker header h1 {
+  margin-bottom: 0;
+  margin-top: 0
+}
+
+body#requirements_checker header h1 span {
+  font-size: 120%;
+  opacity: 0.7;
+  padding: 0 5px
+}
+
+body#requirements_checker .panel li {
+  margin-bottom: 1em
+}
+
+/* Page: 'Homepage'
+   ------------------------------------------------------------------------- */
+body#homepage {
+  text-align: center
+}
+
+/* Page: 'Login'
+   ------------------------------------------------------------------------- */
+body#login #login-users-help p {
+  font-size: 15px;
+  line-height: 1.42857
+}
+
+body#login #login-users-help p:last-child {
+  margin-bottom: 0
+}
+
+body#login #login-users-help p .label {
+  margin-right: 5px
+}
+
+body#login #login-users-help p .console {
+  display: block;
+  margin: 5px 0;
+  padding: 10px
+}
+
+/* Common Blog page elements
+   ------------------------------------------------------------------------- */
+.post-metadata {
+  color: #b4bcc2;
+  font-size: 19px;
+  margin-bottom: 16px;
+}
+.post-metadata .metadata {
+  margin-right: 1.5em;
+}
+
+.post-tags .label {
+  margin-right: 5px;
+}
+
+/* Page: 'Blog index'
+   ------------------------------------------------------------------------- */
+body#blog_index #main h1,
+body#blog_index #main p {
+  margin-bottom: 0.5em
+}
+
+body#blog_index article.post {
+  margin-bottom: 3em;
+}
+
+body#blog_index .post-metadata {
+  font-size: 16px;
+  margin-bottom: 8px;
+}
+
+body#blog_index .post-tags .label-default {
+  background-color: #e9ecec;
+  color: #6d8283;
+}
+body#blog_index .post-tags .label-default i {
+  color: #a3b2b2;
+}
+
+/* Page: 'Blog post show'
+   ------------------------------------------------------------------------- */
+body#blog_post_show #main h3 {
+  margin-bottom: 0.75em
+}
+
+body#blog_post_show .post-tags .label-default {
+  background-color: #e9ecec;
+  color: #6D8283;
+  font-size: 16px;
+  margin-right: 10px;
+  padding: .4em 1em .5em;
+}
+body#blog_post_show .post-tags .label-default i {
+  color: #95A6A7;
+}
+
+body#blog_post_show #post-add-comment {
+  margin: 2em 0
+}
+
+body#blog_post_show #post-add-comment p {
+  margin-bottom: 0
+}
+
+body#blog_post_show #post-add-comment p a.btn {
+  margin-right: 0.5em
+}
+
+body#blog_post_show .post-comment {
+  margin-bottom: 2em
+}
+
+body#blog_post_show .post-comment h4 {
+  font-size: 13px;
+  line-height: 1.42857;
+  margin-top: 0
+}
+
+body#blog_post_show .post-comment h4 strong {
+  display: block
+}
+
+/* Page: 'Comment form error'
+   ------------------------------------------------------------------------- */
+body#comment_form_error h1.text-danger {
+  margin-bottom: 1em
+}
+
+@media (min-width: 768px) and (max-width: 1200px) {
+  .container {
+    width: 98%;
+  }
+}
+
+/* Page: 'Blog search'
+   ------------------------------------------------------------------------- */
+body#blog_search #main h1,
+body#blog_search #main p {
+  margin-bottom: 0.5em
+}
+
+body#blog_search article.post:first-child {
+  margin-top: 2em;
+}
+
+body#blog_search article.post {
+  margin-bottom: 2em;
+}
+
+body#blog_search .post-metadata {
+  font-size: 16px;
+  margin-bottom: 8px;
+}

app/assets/scss/bootstrap-tagsinput.scss

@@ -0,0 +1,194 @@
+/* ------------------------------------------------------------------------------
+ *
+ *  # Twiter Typeahead
+ *
+ *  Styles for tagsinput.js - input suggestion engine
+ *
+ * ---------------------------------------------------------------------------- */
+.twitter-typeahead {
+  width: 100%;
+}
+.typeahead,
+.tt-query,
+.tt-hint {
+  outline: 0;
+}
+.tt-hint {
+  color: #999;
+}
+.tt-menu{
+  width: 100%;
+  margin-top: 1px;
+  min-width: 180px;
+  padding: 7px 0;
+  background-color: #fff;
+  border: 1px solid rgba(0,0,0,0.15);
+  border-radius: 4px;
+  max-height: 300px;
+  overflow-y: auto;
+  -webkit-box-shadow: 0 6px 12px rgba(0,0,0,0.175);
+  box-shadow: 0 6px 12px rgba(0,0,0,0.175);
+  -webkit-background-clip: padding-box;
+  background-clip: padding-box;
+}
+.typeahead-scrollable .tt-menu{
+  max-height: 250px;
+}
+.typeahead-rtl .tt-menu{
+  text-align: right;
+}
+.tt-suggestion {
+  padding: 8px 15px;
+  cursor: pointer;
+}
+.tt-suggestion.tt-cursor {
+  background-color: #f5f5f5;
+}
+.tt-suggestion p {
+  margin: 0;
+}
+.tt-suggestion.tt-selectable:before {
+  content: '\f02b';
+  font-family: 'Font Awesome 5 Free';
+  font-weight: 900;
+  display: inline-block;
+  font-size: 15px;
+  margin-right: 0.5em;
+  color: inherit;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+.tt-dataset-group .tt-suggestion {
+  padding-left: 24px;
+  padding-right: 24px;
+}
+.tt-heading {
+  font-size: 11px;
+  line-height: 1.82;
+  padding: 8px 15px;
+  text-transform: uppercase;
+  display: block;
+  font-weight: 700;
+  margin-top: 2px;
+  margin-bottom: 2px;
+}
+.tt-suggestion:hover,
+.tt-suggestion:focus {
+  color: #ffffff;
+  text-decoration: none;
+  outline: 0;
+  background-color: #18bc9c;
+}
+/* ------------------------------------------------------------------------------
+*
+*  # Bootstrap tags input
+*
+*  Styles for tagsinput.js - tags input for Bootstrap
+*
+* ---------------------------------------------------------------------------- */
+.bootstrap-tagsinput {
+  display: table-cell;
+  vertical-align: middle;
+  width: 100%;
+  height: 45px;
+  padding: 0;
+  font-size: 15px;
+  line-height: 1.42857143;
+  color: #2c3e50;
+  background-color: #ffffff;
+  background-image: none;
+  border: 2px solid #dce4ec;
+  border-radius: 4px;
+  border-bottom-right-radius: 0;
+  border-top-right-radius: 0;
+  -webkit-transition: border-color ease-in-out .15s,-webkit-box-shadow ease-in-out .15s;
+  -o-transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
+  transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
+}
+.has-error .bootstrap-tagsinput {
+  border-color: #e74c3c !important;
+}
+.bootstrap-tagsinput.focus {
+  border-color: #2c3e50;
+  outline: 0;
+  box-shadow: none;
+}
+.bootstrap-tagsinput input {
+  border: 0;
+  outline: 0;
+  background-color: transparent;
+  padding: 5px 11px;
+  margin-top: 2px;
+  margin-left: 2px;
+  width: auto !important;
+  min-width: 100px;
+  font-size: 15px;
+  line-height: 1.6666667;
+  -webkit-box-shadow: none;
+  box-shadow: none;
+}
+.bootstrap-tagsinput input:focus {
+  border: none;
+  box-shadow: none;
+}
+.bootstrap-tagsinput .twitter-typeahead {
+  width: auto;
+}
+.bootstrap-tagsinput .tt-menu {
+  margin-top: 5px;
+  min-width: 200px;
+}
+.bootstrap-tagsinput .tag {
+  margin: 1px 0 0 3px;
+  border: 0;
+  border-radius: .25em;
+  padding: 5px 11px;
+  padding-right: 30px;
+  float: left;
+  font-size: 15px;
+  line-height: 1.6666667;
+  font-weight: 400;
+  text-transform: none;
+  position: relative;
+  background-color: #18bc9c;
+  color: #fff;
+}
+.has-error .bootstrap-tagsinput .tag {
+  background-color: #e74c3c !important;
+}
+.bootstrap-tagsinput .tag [data-role="remove"] {
+  cursor: pointer;
+  color: inherit;
+  position: absolute;
+  top: 50%;
+  right: 11px;
+  line-height: 1;
+  margin-top: -5.5px;
+  opacity: 0.7;
+  filter: alpha(opacity=70);
+}
+.bootstrap-tagsinput .tag [data-role="remove"]:hover {
+  opacity: 1;
+  filter: alpha(opacity=100);
+}
+.bootstrap-tagsinput .tag:before {
+  content: '\f02b';
+  font-family: 'Font Awesome 5 Free';
+  font-weight: 900;
+  display: inline-block;
+  font-size: 15px;
+  margin-right: 0.5em;
+  color: #fff;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+.bootstrap-tagsinput .tag [data-role="remove"]:after {
+  content: '\f00d';
+  font-family: 'Font Awesome 5 Free';
+  font-weight: 900;
+  display: block;
+  font-size: 13px;
+  color: #fff;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}

app/assets/styles/app.css

@@ -1,3 +0,0 @@
-body {
-    background-color: lightgray;
-}

app/bin/console

@@ -3,15 +3,41 @@
 
 use App\Kernel;
 use Symfony\Bundle\FrameworkBundle\Console\Application;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Dotenv\Dotenv;
+use Symfony\Component\ErrorHandler\Debug;
 
-if (!is_file(dirname(__DIR__).'/vendor/autoload_runtime.php')) {
+if (!in_array(PHP_SAPI, ['cli', 'phpdbg', 'embed'], true)) {
-    throw new LogicException('Symfony Runtime is missing. Try running "composer require symfony/runtime".');
+    echo 'Warning: The console should be invoked via the CLI version of PHP, not the '.PHP_SAPI.' SAPI'.PHP_EOL;
 }
 
-require_once dirname(__DIR__).'/vendor/autoload_runtime.php';
+set_time_limit(0);
 
-return function (array $context) {
+require dirname(__DIR__).'/vendor/autoload.php';
-    $kernel = new Kernel($context['APP_ENV'], (bool) $context['APP_DEBUG']);
 
-    return new Application($kernel);
+if (!class_exists(Application::class) || !class_exists(Dotenv::class)) {
-};
+    throw new LogicException('You need to add "symfony/framework-bundle" and "symfony/dotenv" as Composer dependencies.');
+}
+
+$input = new ArgvInput();
+if (null !== $env = $input->getParameterOption(['--env', '-e'], null, true)) {
+    putenv('APP_ENV='.$_SERVER['APP_ENV'] = $_ENV['APP_ENV'] = $env);
+}
+
+if ($input->hasParameterOption('--no-debug', true)) {
+    putenv('APP_DEBUG='.$_SERVER['APP_DEBUG'] = $_ENV['APP_DEBUG'] = '0');
+}
+
+(new Dotenv())->bootEnv(dirname(__DIR__).'/.env');
+
+if ($_SERVER['APP_DEBUG']) {
+    umask(0000);
+
+    if (class_exists(Debug::class)) {
+        Debug::enable();
+    }
+}
+
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
+$application = new Application($kernel);
+$application->run($input);

app/bin/phpunit

@@ -0,0 +1,13 @@
+#!/usr/bin/env php
+<?php
+
+if (!file_exists(dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-phpunit.php')) {
+    echo "Unable to find the `simple-phpunit.php` script in `vendor/symfony/phpunit-bridge/bin/`.\n";
+    exit(1);
+}
+
+if (false === getenv('SYMFONY_PHPUNIT_DIR')) {
+    putenv('SYMFONY_PHPUNIT_DIR='.__DIR__.'/.phpunit');
+}
+
+require dirname(__DIR__).'/vendor/symfony/phpunit-bridge/bin/simple-phpunit.php';

app/composer.json

@@ -1,46 +1,61 @@
 {
+    "name": "symfony/symfony-demo",
+    "license": "MIT",
     "type": "project",
-    "license": "proprietary",
+    "description": "Symfony Demo Application",
     "minimum-stability": "stable",
     "prefer-stable": true,
+    "replace": {
+        "symfony/polyfill-php70": "*",
+        "symfony/polyfill-php72": "*"
+    },
     "require": {
-        "php": ">=7.2.5",
+        "php": "^7.2.9",
-        "ext-ctype": "*",
+        "ext-pdo_sqlite": "*",
-        "ext-iconv": "*",
+        "composer/package-versions-deprecated": "^1.8",
-        "doctrine/annotations": "^1.13",
+        "doctrine/doctrine-bundle": "^1.12|^2.0",
-        "doctrine/doctrine-bundle": "^2.7",
+        "doctrine/doctrine-migrations-bundle": "^3.0",
-        "doctrine/doctrine-migrations-bundle": "^3.2",
+        "doctrine/orm": "^2.5.11",
-        "doctrine/orm": "^2.13",
+        "erusev/parsedown": "^1.6",
-        "egulias/email-validator": "^3.2",
+        "sensio/framework-extra-bundle": "^5.6",
-        "sensio/framework-extra-bundle": "^6.2",
+        "symfony/apache-pack": "^1.0",
-        "symfony/asset": "^5.4",
+        "symfony/asset": "^5.2",
-        "symfony/console": "5.4.*",
+        "symfony/console": "^5.2",
-        "symfony/dotenv": "5.4.*",
+        "symfony/dotenv": "^5.2",
-        "symfony/expression-language": "^5.4",
+        "symfony/expression-language": "^5.2",
-        "symfony/flex": "^1.17|^2",
+        "symfony/flex": "^1.1",
-        "symfony/form": "^5.4",
+        "symfony/form": "^5.2",
-        "symfony/framework-bundle": "5.4.*",
+        "symfony/framework-bundle": "^5.2",
-        "symfony/intl": "^5.4",
+        "symfony/intl": "^5.2",
-        "symfony/maker-bundle": "^1.43",
+        "symfony/mailer": "^5.2",
-        "symfony/proxy-manager-bridge": "5.4.*",
+        "symfony/monolog-bundle": "^3.1",
-        "symfony/runtime": "5.4.*",
+        "symfony/polyfill-intl-messageformatter": "^1.12",
-        "symfony/security-csrf": "^5.4",
+        "symfony/security-bundle": "^5.2",
-        "symfony/security-http": "^5.4",
+        "symfony/string": "^5.2",
-        "symfony/translation": "^5.4",
+        "symfony/translation": "^5.2",
-        "symfony/twig-bridge": "^5.4",
+        "symfony/twig-pack": "^1.0",
-        "symfony/validator": "^5.4",
+        "symfony/validator": "^5.2",
-        "symfony/web-link": "^5.4",
+        "symfony/webpack-encore-bundle": "^1.4",
-        "symfony/webpack-encore-bundle": "^1.15",
+        "symfony/yaml": "^5.2",
-        "symfony/yaml": "^5.4",
+        "tgalopin/html-sanitizer-bundle": "^1.2",
-        "twig/twig": "^3.4"
+        "twig/intl-extra": "^3.0",
+        "twig/markdown-extra": "^3.0"
+    },
+    "require-dev": {
+        "dama/doctrine-test-bundle": "^6.2",
+        "doctrine/doctrine-fixtures-bundle": "^3.0",
+        "symfony/browser-kit": "^5.2",
+        "symfony/css-selector": "^5.2",
+        "symfony/debug-bundle": "^5.2",
+        "symfony/maker-bundle": "^1.11",
+        "symfony/phpunit-bridge": "^5.2",
+        "symfony/stopwatch": "^5.2",
+        "symfony/web-profiler-bundle": "^5.2"
     },
     "config": {
-        "allow-plugins": {
+        "platform": {
-            "composer/package-versions-deprecated": true,
+            "php": "7.2.9"
-            "symfony/flex": true,
-            "symfony/runtime": true
         },
-        "optimize-autoloader": true,
         "preferred-install": {
             "*": "dist"
         },
@@ -56,15 +71,10 @@
             "App\\Tests\\": "tests/"
         }
     },
-    "replace": {
-        "symfony/polyfill-ctype": "*",
-        "symfony/polyfill-iconv": "*",
-        "symfony/polyfill-php72": "*"
-    },
     "scripts": {
         "auto-scripts": {
             "cache:clear": "symfony-cmd",
-            "assets:install %PUBLIC_DIR%": "symfony-cmd"
+            "assets:install --symlink --relative %PUBLIC_DIR%": "symfony-cmd"
         },
         "post-install-cmd": [
             "@auto-scripts"
@@ -78,14 +88,7 @@
     },
     "extra": {
         "symfony": {
-            "allow-contrib": false,
+            "allow-contrib": true
-            "require": "5.4.*"
         }
-    },
-    "require-dev": {
-        "symfony/debug-bundle": "^5.4",
-        "symfony/stopwatch": "5.4.*",
-        "symfony/var-dumper": "^5.4",
-        "symfony/web-profiler-bundle": "5.4.*"
     }
 }

app/config/bundles.php

@@ -2,12 +2,18 @@
 
 return [
     Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true],
-    Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true],
+    Symfony\Bundle\SecurityBundle\SecurityBundle::class => ['all' => true],
     Doctrine\Bundle\DoctrineBundle\DoctrineBundle::class => ['all' => true],
-    Doctrine\Bundle\MigrationsBundle\DoctrineMigrationsBundle::class => ['all' => true],
-    Symfony\Bundle\DebugBundle\DebugBundle::class => ['dev' => true],
-    Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true],
-    Symfony\Bundle\WebProfilerBundle\WebProfilerBundle::class => ['dev' => true, 'test' => true],
-    Symfony\WebpackEncoreBundle\WebpackEncoreBundle::class => ['all' => true],
     Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle::class => ['all' => true],
+    Symfony\Bundle\MonologBundle\MonologBundle::class => ['all' => true],
+    Symfony\Bundle\TwigBundle\TwigBundle::class => ['all' => true],
+    Symfony\Bundle\DebugBundle\DebugBundle::class => ['dev' => true, 'test' => true],
+    Symfony\Bundle\WebProfilerBundle\WebProfilerBundle::class => ['dev' => true, 'test' => true],
+    DAMA\DoctrineTestBundle\DAMADoctrineTestBundle::class => ['test' => true],
+    Doctrine\Bundle\MigrationsBundle\DoctrineMigrationsBundle::class => ['all' => true],
+    Doctrine\Bundle\FixturesBundle\DoctrineFixturesBundle::class => ['dev' => true, 'test' => true],
+    Symfony\WebpackEncoreBundle\WebpackEncoreBundle::class => ['all' => true],
+    Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true],
+    Twig\Extra\TwigExtraBundle\TwigExtraBundle::class => ['all' => true],
+    HtmlSanitizer\Bundle\HtmlSanitizerBundle::class => ['all' => true],
 ];

app/config/packages/assets.yaml

@@ -0,0 +1,3 @@
+framework:
+    assets:
+        json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'

app/config/packages/debug.yaml

@@ -1,5 +0,0 @@
-when@dev:
-    debug:
-        # Forwards VarDumper Data clones to a centralized server allowing to inspect dumps on CLI or in your browser.
-        # See the "server:dump" command to start a new server.
-        dump_destination: "tcp://%env(VAR_DUMPER_SERVER)%"

app/config/packages/dev/debug.yaml

@@ -0,0 +1,4 @@
+debug:
+    # Forwards VarDumper Data clones to a centralized server allowing to inspect dumps on CLI or in your browser.
+    # See the "server:dump" command to start a new server.
+    dump_destination: "tcp://%env(VAR_DUMPER_SERVER)%"

app/config/packages/dev/mailer.yaml

@@ -0,0 +1,4 @@
+framework:
+    mailer:
+        # this disables delivery of messages entirely
+        dsn: 'null://null'

app/config/packages/dev/monolog.yaml

@@ -0,0 +1,19 @@
+monolog:
+    handlers:
+        main:
+            type: stream
+            path: "%kernel.logs_dir%/%kernel.environment%.log"
+            level: debug
+            channels: ["!event"]
+        # uncomment to get logging in your browser
+        # you may have to allow bigger header sizes in your Web server configuration
+        #firephp:
+        #    type: firephp
+        #    level: info
+        #chromephp:
+        #    type: chromephp
+        #    level: info
+        console:
+            type: console
+            process_psr_3_messages: false
+            channels: ["!event", "!doctrine", "!console"]

app/config/packages/dev/web_profiler.yaml

@@ -0,0 +1,6 @@
+web_profiler:
+    toolbar: true
+    intercept_redirects: false
+
+framework:
+    profiler: { only_exceptions: false }

app/config/packages/doctrine.yaml

@@ -4,7 +4,7 @@ doctrine:
 
         # IMPORTANT: You MUST configure your server version,
         # either here or in the DATABASE_URL env var (see .env file)
-        #server_version: '15'
+        #server_version: '5.7'
     orm:
         auto_generate_proxy_classes: true
         naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware
@@ -12,32 +12,7 @@ doctrine:
         mappings:
             App:
                 is_bundle: false
+                type: annotation
                 dir: '%kernel.project_dir%/src/Entity'
                 prefix: 'App\Entity'
                 alias: App
-
-when@test:
-    doctrine:
-        dbal:
-            # "TEST_TOKEN" is typically set by ParaTest
-            dbname_suffix: '_test%env(default::TEST_TOKEN)%'
-
-when@prod:
-    doctrine:
-        orm:
-            auto_generate_proxy_classes: false
-            proxy_dir: '%kernel.build_dir%/doctrine/orm/Proxies'
-            query_cache_driver:
-                type: pool
-                pool: doctrine.system_cache_pool
-            result_cache_driver:
-                type: pool
-                pool: doctrine.result_cache_pool
-
-    framework:
-        cache:
-            pools:
-                doctrine.result_cache_pool:
-                    adapter: cache.app
-                doctrine.system_cache_pool:
-                    adapter: cache.system

app/config/packages/doctrine_migrations.yaml

@@ -3,4 +3,3 @@ doctrine_migrations:
         # namespace is arbitrary but should be different from App\Migrations
         # as migrations classes should NOT be autoloaded
         'DoctrineMigrations': '%kernel.project_dir%/migrations'
-    enable_profiler: false

app/config/packages/framework.yaml

@@ -1,8 +1,8 @@
 # see https://symfony.com/doc/current/reference/configuration/framework.html
 framework:
     secret: '%env(APP_SECRET)%'
-    #csrf_protection: true
+    csrf_protection: true
-    http_method_override: false
+    http_method_override: true
 
     # Enables session support. Note that the session will ONLY be started if you read or write from it.
     # Remove or comment this section to explicitly disable session support.
@@ -10,15 +10,18 @@ framework:
         handler_id: null
         cookie_secure: auto
         cookie_samesite: lax
-        storage_factory_id: session.storage.factory.native
 
-    #esi: true
+    # When using the HTTP Cache, ESI allows to render page fragments separately
-    #fragments: true
+    # and with different cache configurations for each fragment
+    # https://symfony.com/doc/current/http_cache/esi.html
+    esi: true
+    fragments: true
+
     php_errors:
         log: true
 
-when@test:
+    # The 'ide' option turns all of the file paths in an exception page
-    framework:
+    # into clickable links that open the given file using your favorite IDE.
-        test: true
+    # When 'ide' is set to null the file is opened in your web browser.
-        session:
+    # See https://symfony.com/doc/current/reference/configuration/framework.html#ide
-            storage_factory_id: session.storage.factory.mock_file
+    ide: null

app/config/packages/html_sanitizer.yaml

@@ -0,0 +1,17 @@
+html_sanitizer:
+    default_sanitizer: 'default'
+    sanitizers:
+        default:
+            # Read https://github.com/tgalopin/html-sanitizer/blob/master/docs/1-getting-started.md#extensions
+            # to learn more about which extensions you would like to enable.
+            extensions:
+                - 'basic'
+                - 'list'
+                - 'table'
+                - 'image'
+                - 'code'
+                # - 'iframe'
+                # - 'extra'
+
+            # Read https://github.com/tgalopin/html-sanitizer/blob/master/docs/3-configuration-reference.md
+            # to discover all the available options for each extension.

app/config/packages/mailer.yaml

@@ -0,0 +1,3 @@
+framework:
+    mailer:
+        dsn: '%env(MAILER_DSN)%'

app/config/packages/prod/deprecations.yaml

@@ -0,0 +1,8 @@
+# As of Symfony 5.1, deprecations are logged in the dedicated "deprecation" channel when it exists
+#monolog:
+#    channels: [deprecation]
+#    handlers:
+#        deprecation:
+#            type: stream
+#            channels: [deprecation]
+#            path: "%kernel.logs_dir%/%kernel.environment%.deprecations.log"

app/config/packages/prod/doctrine.yaml

@@ -0,0 +1,20 @@
+doctrine:
+    orm:
+        auto_generate_proxy_classes: false
+        metadata_cache_driver:
+            type: pool
+            pool: doctrine.system_cache_pool
+        query_cache_driver:
+            type: pool
+            pool: doctrine.system_cache_pool
+        result_cache_driver:
+            type: pool
+            pool: doctrine.result_cache_pool
+
+framework:
+    cache:
+        pools:
+            doctrine.result_cache_pool:
+                adapter: cache.app
+            doctrine.system_cache_pool:
+                adapter: cache.system

app/config/packages/prod/monolog.yaml

@@ -0,0 +1,16 @@
+monolog:
+    handlers:
+        main:
+            type: fingers_crossed
+            action_level: error
+            handler: nested
+            excluded_http_codes: [404, 405]
+            buffer_size: 50 # How many messages should be saved? Prevent memory leaks
+        nested:
+            type: stream
+            path: "%kernel.logs_dir%/%kernel.environment%.log"
+            level: debug
+        console:
+            type: console
+            process_psr_3_messages: false
+            channels: ["!event", "!doctrine"]

app/config/packages/prod/routing.yaml

@@ -0,0 +1,3 @@
+framework:
+    router:
+        strict_requirements: null

app/config/packages/prod/webpack_encore.yaml

@@ -0,0 +1,4 @@
+#webpack_encore:
+    # Cache the entrypoints.json (rebuild Symfony's cache when entrypoints.json changes)
+    # Available in version 1.2
+    #cache: true

app/config/packages/routing.yaml

@@ -5,8 +5,3 @@ framework:
         # Configure how to generate URLs in non-HTTP contexts, such as CLI commands.
         # See https://symfony.com/doc/current/routing.html#generating-urls-in-commands
         #default_uri: http://localhost
-
-when@prod:
-    framework:
-        router:
-            strict_requirements: null

app/config/packages/security.yaml

@@ -0,0 +1,63 @@
+security:
+    encoders:
+        # Our user class and the algorithm we'll use to encode passwords
+        # 'auto' means to let Symfony choose the best possible password hasher (Argon2 or Bcrypt)
+        # https://symfony.com/doc/current/security.html#c-encoding-passwords
+        App\Entity\User: 'auto'
+
+    providers:
+        # https://symfony.com/doc/current/security/user_provider.html
+        # In this example, users are stored via Doctrine in the database
+        # To see the users at src/App/DataFixtures/ORM/LoadFixtures.php
+        # To load users from somewhere else: https://symfony.com/doc/current/security/user_provider.html#creating-a-custom-user-provider
+        database_users:
+            entity: { class: App\Entity\User, property: username }
+
+    # https://symfony.com/doc/current/security.html#a-authentication-firewalls
+    firewalls:
+        dev:
+            pattern: ^/(_(profiler|wdt)|css|images|js)/
+            security: false
+
+        main:
+            # this firewall applies to all URLs
+            pattern: ^/
+
+            # but the firewall does not require login on every page
+            # denying access is done in access_control or in your controllers
+            anonymous: true
+            lazy: true
+
+            # The user provider to use.
+            provider: database_users
+
+            # This allows the user to login by submitting a username and password
+            # Reference: https://symfony.com/doc/current/security/form_login_setup.html
+            form_login:
+                # The route name that the login form submits to
+                check_path: security_login
+                # The name of the route where the login form lives
+                # When the user tries to access a protected page, they are redirected here
+                login_path: security_login
+                # Secure the login form against CSRF
+                # Reference: https://symfony.com/doc/current/security/csrf.html#csrf-protection-in-login-forms
+                csrf_token_generator: security.csrf.token_manager
+                # The page users are redirect to when there is no previous page stored in the
+                # session (for example when the users access directly to the login page).
+                default_target_path: blog_index
+
+            logout:
+                # The route name the user can go to in order to logout
+                path: security_logout
+                # The name of the route to redirect to after logging out
+                target: homepage
+
+    # Easy way to control access for large sections of your site
+    # Note: Only the *first* access control that matches will be used
+    access_control:
+        # this is a catch-all for the admin area
+        # additional security lives in the controllers
+        - { path: '^/(%app_locales%)/admin', roles: ROLE_ADMIN }
+
+    role_hierarchy:
+        ROLE_ADMIN: ROLE_USER

app/config/packages/test/dama_doctrine_test_bundle.yaml

@@ -0,0 +1,4 @@
+dama_doctrine_test:
+    enable_static_connection: true
+    enable_static_meta_data_cache: true
+    enable_static_query_cache: true

app/config/packages/test/framework.yaml

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

app/config/packages/test/mailer.yaml

@@ -0,0 +1,4 @@
+framework:
+    mailer:
+        # this disables delivery of messages entirely
+        dsn: 'null://null'

app/config/packages/test/monolog.yaml

@@ -0,0 +1,12 @@
+monolog:
+    handlers:
+        main:
+            type: fingers_crossed
+            action_level: error
+            handler: nested
+            excluded_http_codes: [404, 405]
+            channels: ["!event"]
+        nested:
+            type: stream
+            path: "%kernel.logs_dir%/%kernel.environment%.log"
+            level: debug

app/config/packages/test/security.yaml

@@ -0,0 +1,6 @@
+# this configuration simplifies testing URLs protected by the security mechanism
+# See https://symfony.com/doc/current/testing/http_authentication.html
+security:
+    firewalls:
+        main:
+            http_basic: ~

app/config/packages/test/twig.yaml

@@ -0,0 +1,2 @@
+twig:
+    strict_variables: true

app/config/packages/test/validator.yaml

@@ -0,0 +1,3 @@
+framework:
+    validation:
+        not_compromised_password: false

app/config/packages/test/web_profiler.yaml

@@ -0,0 +1,6 @@
+web_profiler:
+    toolbar: false
+    intercept_redirects: false
+
+framework:
+    profiler: { collect: false }

app/config/packages/test/webpack_encore.yaml

@@ -0,0 +1,2 @@
+#webpack_encore:
+#    strict_mode: false

app/config/packages/translation.yaml

@@ -1,13 +1,6 @@
 framework:
-    default_locale: en
+    default_locale: '%locale%'
     translator:
         default_path: '%kernel.project_dir%/translations'
         fallbacks:
-            - en
+            - '%locale%'
-#        providers:
-#            crowdin:
-#                dsn: '%env(CROWDIN_DSN)%'
-#            loco:
-#                dsn: '%env(LOCO_DSN)%'
-#            lokalise:
-#                dsn: '%env(LOKALISE_DSN)%'

app/config/packages/twig.yaml

@@ -1,6 +1,5 @@
 twig:
     default_path: '%kernel.project_dir%/templates'
-
+    form_themes:
-when@test:
+        - 'form/layout.html.twig'
-    twig:
+        - 'form/fields.html.twig'
-        strict_variables: true

app/config/packages/validator.yaml

@@ -1,13 +1,9 @@
 framework:
     validation:
+        enable_annotations: true
         email_validation_mode: html5
 
         # Enables validator auto-mapping support.
         # For instance, basic validation constraints will be inferred from Doctrine's metadata.
-        #auto_mapping:
+        auto_mapping:
-        #    App\Entity\: []
+           App\Entity\: []
-
-when@test:
-    framework:
-        validation:
-            not_compromised_password: false

app/config/packages/web_profiler.yaml

@@ -1,15 +0,0 @@
-when@dev:
-    web_profiler:
-        toolbar: true
-        intercept_redirects: false
-
-    framework:
-        profiler: { only_exceptions: false }
-
-when@test:
-    web_profiler:
-        toolbar: false
-        intercept_redirects: false
-
-    framework:
-        profiler: { collect: false }

app/config/packages/webpack_encore.yaml

@@ -4,42 +4,22 @@ webpack_encore:
     # If multiple builds are defined (as shown below), you can disable the default build:
     # output_path: false
 
-    # Set attributes that will be rendered on all script and link tags
+    # if using Encore.enableIntegrityHashes() and need the crossorigin attribute (default: false, or use 'anonymous' or 'use-credentials')
-    script_attributes:
-        defer: true
-        # Uncomment (also under link_attributes) if using Turbo Drive
-        # https://turbo.hotwired.dev/handbook/drive#reloading-when-assets-change
-        # 'data-turbo-track': reload
-    # link_attributes:
-        # Uncomment if using Turbo Drive
-        # 'data-turbo-track': reload
-
-    # If using Encore.enableIntegrityHashes() and need the crossorigin attribute (default: false, or use 'anonymous' or 'use-credentials')
     # crossorigin: 'anonymous'
 
-    # Preload all rendered script and link tags automatically via the HTTP/2 Link header
+    # preload all rendered script and link tags automatically via the http2 Link header
     # preload: true
 
     # Throw an exception if the entrypoints.json file is missing or an entry is missing from the data
     # strict_mode: false
 
-    # If you have multiple builds:
+    # if you have multiple builds:
     # builds:
-        # frontend: '%kernel.project_dir%/public/frontend/build'
+        # pass "frontend" as the 3rg arg to the Twig functions
-
-        # pass the build name as the 3rd argument to the Twig functions
         # {{ encore_entry_script_tags('entry1', null, 'frontend') }}
 
-framework:
+        # frontend: '%kernel.project_dir%/public/frontend/build'
-    assets:
-        json_manifest_path: '%kernel.project_dir%/public/build/manifest.json'
 
-#when@prod:
+    # Cache the entrypoints.json (rebuild Symfony's cache when entrypoints.json changes)
-#    webpack_encore:
+    # Put in config/packages/prod/webpack_encore.yaml
-#        # Cache the entrypoints.json (rebuild Symfony's cache when entrypoints.json changes)
+    # cache: true
-#        # Available in version 1.2
-#        cache: true
-
-#when@test:
-#    webpack_encore:
-#        strict_mode: false

app/config/routes.yaml

@@ -1,3 +1,12 @@
-#index:
+# These lines define a route using YAML configuration. The controller used by
-#    path: /
+# the route (FrameworkBundle:Template:template) is a convenient shortcut when
-#    controller: App\Controller\DefaultController::index
+# the template can be rendered without executing any logic in your own controller.
+# See https://symfony.com/doc/current/templates.html#rendering-a-template-directly-from-a-route
+homepage:
+    path: /{_locale}
+    controller: Symfony\Bundle\FrameworkBundle\Controller\TemplateController::templateAction
+    requirements:
+        _locale: '%app_locales%'
+    defaults:
+        template: default/homepage.html.twig
+        _locale: '%locale%'

app/config/routes/annotations.yaml

@@ -1,7 +1,8 @@
 controllers:
-    resource: ../../src/Controller/
+    resource: '../../src/Controller/'
-    type: annotation
-
-kernel:
-    resource: ../../src/Kernel.php
     type: annotation
+    prefix: /{_locale}
+    requirements:
+        _locale: '%app_locales%'
+    defaults:
+        _locale: '%locale%'

app/config/routes/dev/framework.yaml

@@ -0,0 +1,3 @@
+_errors:
+    resource: '@FrameworkBundle/Resources/config/routing/errors.xml'
+    prefix: /_error

app/config/routes/dev/web_profiler.yaml

@@ -0,0 +1,7 @@
+web_profiler_wdt:
+    resource: '@WebProfilerBundle/Resources/config/routing/wdt.xml'
+    prefix: /_wdt
+
+web_profiler_profiler:
+    resource: '@WebProfilerBundle/Resources/config/routing/profiler.xml'
+    prefix: /_profiler

app/config/routes/framework.yaml

@@ -1,4 +0,0 @@
-when@dev:
-    _errors:
-        resource: '@FrameworkBundle/Resources/config/routing/errors.xml'
-        prefix: /_error

app/config/routes/web_profiler.yaml

@@ -1,8 +0,0 @@
-when@dev:
-    web_profiler_wdt:
-        resource: '@WebProfilerBundle/Resources/config/routing/wdt.xml'
-        prefix: /_wdt
-
-    web_profiler_profiler:
-        resource: '@WebProfilerBundle/Resources/config/routing/profiler.xml'
-        prefix: /_profiler

app/config/services.yaml

@@ -2,14 +2,22 @@
 # Files in the packages/ subdirectory configure your dependencies.
 
 # 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
+# https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
 parameters:
+    locale: 'en'
+    # This parameter defines the codes of the locales (languages) enabled in the application
+    app_locales: ar|en|fr|de|es|cs|nl|ru|uk|ro|pt_BR|pl|it|ja|id|ca|sl|hr|zh_CN|bg|tr|lt
+    app.notifications.email_sender: anonymous@example.com
 
 services:
     # default configuration for services in *this* file
     _defaults:
         autowire: true      # Automatically injects dependencies in your services.
         autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
+        bind:               # defines the scalar arguments once and apply them to any service defined/created in this file
+            string $locales: '%app_locales%'
+            string $defaultLocale: '%locale%'
+            string $emailSender: '%app.notifications.email_sender%'
 
     # makes classes in src/ available to be used as services
     # this creates a service per class whose id is the fully-qualified class name
@@ -19,6 +27,15 @@ services:
             - '../src/DependencyInjection/'
             - '../src/Entity/'
             - '../src/Kernel.php'
+            - '../src/Tests/'
 
-    # add more service definitions when explicit configuration is needed
+    # controllers are imported separately to make sure services can be injected
-    # please note that last definitions always *replace* previous ones
+    # as action arguments even if you don't extend any base controller class
+    App\Controller\:
+        resource: '../src/Controller/'
+        tags: ['controller.service_arguments']
+
+    # when the service definition only contains arguments, you can omit the
+    # 'arguments' key and define the arguments just below the service class
+    App\EventSubscriber\CommentNotificationSubscriber:
+        $sender: '%app.notifications.email_sender%'

app/docker-compose.override.yml

@@ -1,8 +0,0 @@
-version: '3'
-
-services:
-###> doctrine/doctrine-bundle ###
-  database:
-    ports:
-      - "5432"
-###< doctrine/doctrine-bundle ###

app/docker-compose.yml

@@ -1,21 +0,0 @@
-version: '3'
-
-services:
-###> doctrine/doctrine-bundle ###
-  database:
-    image: postgres:${POSTGRES_VERSION:-15}-alpine
-    environment:
-      POSTGRES_DB: ${POSTGRES_DB:-app}
-      # You should definitely change the password in production
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-!ChangeMe!}
-      POSTGRES_USER: ${POSTGRES_USER:-app}
-    volumes:
-      - database_data:/var/lib/postgresql/data:rw
-      # You may use a bind-mounted host directory instead, so that it is harder to accidentally remove the volume and lose all your data!
-      # - ./docker/db/data:/var/lib/postgresql/data:rw
-###< doctrine/doctrine-bundle ###
-
-volumes:
-###> doctrine/doctrine-bundle ###
-  database_data:
-###< doctrine/doctrine-bundle ###

app/package.json

@@ -1,17 +1,22 @@
 {
   "devDependencies": {
-        "@babel/core": "^7.17.0",
+    "@fortawesome/fontawesome-free": "^5.8.1",
-        "@babel/preset-env": "^7.16.0",
+    "@symfony/webpack-encore": "^0.31.0",
-        "@hotwired/stimulus": "^3.0.0",
+    "bloodhound-js": "^1.2.3",
-        "@symfony/stimulus-bridge": "^3.2.0",
+    "bootstrap-sass": "^3.3.7",
-        "@symfony/webpack-encore": "^4.0.0",
+    "bootstrap-tagsinput": "^0.7.1",
-        "core-js": "^3.23.0",
+    "bootswatch": "^3.3.7",
-        "regenerator-runtime": "^0.13.9",
+    "core-js": "^3.0.0",
-        "webpack": "^5.74.0",
+    "eonasdan-bootstrap-datetimepicker": "^4.17.47",
-        "webpack-cli": "^4.10.0",
+    "highlight.js": "^10.4.1",
-        "webpack-notifier": "^1.15.0"
+    "imports-loader": "^0.8.0",
+    "jquery": "^3.5.1",
+    "lato-font": "^3.0.0",
+    "node-sass": "^4.9.3",
+    "sass-loader": "^9.0.1",
+    "typeahead.js": "^0.11.1"
   },
-    "license": "UNLICENSED",
+  "license": "MIT",
   "private": true,
   "scripts": {
     "dev-server": "encore dev-server",

app/phpunit.xml.dist

@@ -0,0 +1,39 @@
+<?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="bin/.phpunit/phpunit.xsd"
+         backupGlobals="false"
+         colors="true"
+         bootstrap="tests/bootstrap.php"
+>
+    <php>
+        <ini name="error_reporting" value="-1" />
+        <server name="APP_ENV" value="test" force="true" />
+        <server name="SHELL_VERBOSITY" value="-1" />
+        <server name="SYMFONY_PHPUNIT_REMOVE" value="" />
+        <server name="SYMFONY_PHPUNIT_VERSION" value="8" />
+    </php>
+
+    <testsuites>
+        <testsuite name="Project Test Suite">
+            <directory>tests</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>src</directory>
+        </whitelist>
+    </filter>
+
+    <listeners>
+        <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener" />
+    </listeners>
+
+    <extensions>
+        <!-- it begins a database transaction before every testcase and rolls it back after
+            the test finished, so tests can manipulate the database without affecting other tests -->
+        <extension class="\DAMA\DoctrineTestBundle\PHPUnit\PHPUnitExtension" />
+    </extensions>
+</phpunit>

app/public/.htaccess

@@ -0,0 +1,66 @@
+# Use the front controller as index file. It serves as a fallback solution when
+# every other rewrite/redirect fails (e.g. in an aliased environment without
+# mod_rewrite). Additionally, this reduces the matching process for the
+# start page (path "/") because otherwise Apache will apply the rewriting rules
+# to each configured DirectoryIndex file (e.g. index.php, index.html, index.pl).
+DirectoryIndex index.php
+
+# By default, Apache does not evaluate symbolic links if you did not enable this
+# feature in your server configuration. Uncomment the following line if you
+# install assets as symlinks or if you experience problems related to symlinks
+# when compiling LESS/Sass/CoffeScript assets.
+# Options +FollowSymlinks
+
+# Disabling MultiViews prevents unwanted negotiation, e.g. "/index" should not resolve
+# to the front controller "/index.php" but be rewritten to "/index.php/index".
+<IfModule mod_negotiation.c>
+    Options -MultiViews
+</IfModule>
+
+<IfModule mod_rewrite.c>
+    RewriteEngine On
+
+    # Determine the RewriteBase automatically and set it as environment variable.
+    # If you are using Apache aliases to do mass virtual hosting or installed the
+    # project in a subdirectory, the base path will be prepended to allow proper
+    # resolution of the index.php file and to redirect to the correct URI. It will
+    # work in environments without path prefix as well, providing a safe, one-size
+    # fits all solution. But as you do not need it in this case, you can comment
+    # the following 2 lines to eliminate the overhead.
+    RewriteCond %{REQUEST_URI}::$0 ^(/.+)/(.*)::\2$
+    RewriteRule .* - [E=BASE:%1]
+
+    # Sets the HTTP_AUTHORIZATION header removed by Apache
+    RewriteCond %{HTTP:Authorization} .+
+    RewriteRule ^ - [E=HTTP_AUTHORIZATION:%0]
+
+    # Redirect to URI without front controller to prevent duplicate content
+    # (with and without `/index.php`). Only do this redirect on the initial
+    # rewrite by Apache and not on subsequent cycles. Otherwise we would get an
+    # endless redirect loop (request -> rewrite to front controller ->
+    # redirect -> request -> ...).
+    # So in case you get a "too many redirects" error or you always get redirected
+    # to the start page because your Apache does not expose the REDIRECT_STATUS
+    # environment variable, you have 2 choices:
+    # - disable this feature by commenting the following 2 lines or
+    # - use Apache >= 2.3.9 and replace all L flags by END flags and remove the
+    #   following RewriteCond (best solution)
+    RewriteCond %{ENV:REDIRECT_STATUS} =""
+    RewriteRule ^index\.php(?:/(.*)|$) %{ENV:BASE}/$1 [R=301,L]
+
+    # If the requested filename exists, simply serve it.
+    # We only want to let Apache serve files and not directories.
+    # Rewrite all other queries to the front controller.
+    RewriteCond %{REQUEST_FILENAME} !-f
+    RewriteRule ^ %{ENV:BASE}/index.php [L]
+</IfModule>
+
+<IfModule !mod_rewrite.c>
+    <IfModule mod_alias.c>
+        # When mod_rewrite is not available, we instruct a temporary redirect of
+        # the start page to the front controller explicitly so that the website
+        # and the generated links can still be used.
+        RedirectMatch 307 ^/$ /index.php/
+        # RedirectTemp cannot be used instead
+    </IfModule>
+</IfModule>

app/public/index.php

@@ -1,9 +1,30 @@
 <?php
 
 use App\Kernel;
+use Symfony\Component\Dotenv\Dotenv;
+use Symfony\Component\ErrorHandler\Debug;
+use Symfony\Component\HttpFoundation\Request;
 
-require_once dirname(__DIR__).'/vendor/autoload_runtime.php';
+require dirname(__DIR__).'/vendor/autoload.php';
 
-return function (array $context) {
+(new Dotenv())->bootEnv(dirname(__DIR__).'/.env');
-    return new Kernel($context['APP_ENV'], (bool) $context['APP_DEBUG']);
+
-};
+if ($_SERVER['APP_DEBUG']) {
+    umask(0000);
+
+    Debug::enable();
+}
+
+if ($trustedProxies = $_SERVER['TRUSTED_PROXIES'] ?? false) {
+    Request::setTrustedProxies(explode(',', $trustedProxies), Request::HEADER_X_FORWARDED_ALL ^ Request::HEADER_X_FORWARDED_HOST);
+}
+
+if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? false) {
+    Request::setTrustedHosts([$trustedHosts]);
+}
+
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
+$request = Request::createFromGlobals();
+$response = $kernel->handle($request);
+$response->send();
+$kernel->terminate($request, $response);

app/public/robots.txt

@@ -0,0 +1,4 @@
+# www.robotstxt.org/
+# www.google.com/support/webmasters/bin/answer.py?hl=en&answer=156449
+
+User-agent: *

app/src/Command/AddUserCommand.php

@@ -0,0 +1,263 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Command;
+
+use App\Entity\User;
+use App\Repository\UserRepository;
+use App\Utils\Validator;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\RuntimeException;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
+use Symfony\Component\Stopwatch\Stopwatch;
+use function Symfony\Component\String\u;
+
+/**
+ * A console command that creates users and stores them in the database.
+ *
+ * To use this command, open a terminal window, enter into your project
+ * directory and execute the following:
+ *
+ *     $ php bin/console app:add-user
+ *
+ * To output detailed information, increase the command verbosity:
+ *
+ *     $ php bin/console app:add-user -vv
+ *
+ * See https://symfony.com/doc/current/console.html
+ *
+ * We use the default services.yaml configuration, so command classes are registered as services.
+ * See https://symfony.com/doc/current/console/commands_as_services.html
+ *
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+class AddUserCommand extends Command
+{
+    // to make your command lazily loaded, configure the $defaultName static property,
+    // so it will be instantiated only when the command is actually called.
+    protected static $defaultName = 'app:add-user';
+
+    /**
+     * @var SymfonyStyle
+     */
+    private $io;
+
+    private $entityManager;
+    private $passwordEncoder;
+    private $validator;
+    private $users;
+
+    public function __construct(EntityManagerInterface $em, UserPasswordEncoderInterface $encoder, Validator $validator, UserRepository $users)
+    {
+        parent::__construct();
+
+        $this->entityManager = $em;
+        $this->passwordEncoder = $encoder;
+        $this->validator = $validator;
+        $this->users = $users;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure(): void
+    {
+        $this
+            ->setDescription('Creates users and stores them in the database')
+            ->setHelp($this->getCommandHelp())
+            // commands can optionally define arguments and/or options (mandatory and optional)
+            // see https://symfony.com/doc/current/components/console/console_arguments.html
+            ->addArgument('username', InputArgument::OPTIONAL, 'The username of the new user')
+            ->addArgument('password', InputArgument::OPTIONAL, 'The plain password of the new user')
+            ->addArgument('email', InputArgument::OPTIONAL, 'The email of the new user')
+            ->addArgument('full-name', InputArgument::OPTIONAL, 'The full name of the new user')
+            ->addOption('admin', null, InputOption::VALUE_NONE, 'If set, the user is created as an administrator')
+        ;
+    }
+
+    /**
+     * This optional method is the first one executed for a command after configure()
+     * and is useful to initialize properties based on the input arguments and options.
+     */
+    protected function initialize(InputInterface $input, OutputInterface $output): void
+    {
+        // SymfonyStyle is an optional feature that Symfony provides so you can
+        // apply a consistent look to the commands of your application.
+        // See https://symfony.com/doc/current/console/style.html
+        $this->io = new SymfonyStyle($input, $output);
+    }
+
+    /**
+     * This method is executed after initialize() and before execute(). Its purpose
+     * is to check if some of the options/arguments are missing and interactively
+     * ask the user for those values.
+     *
+     * This method is completely optional. If you are developing an internal console
+     * command, you probably should not implement this method because it requires
+     * quite a lot of work. However, if the command is meant to be used by external
+     * users, this method is a nice way to fall back and prevent errors.
+     */
+    protected function interact(InputInterface $input, OutputInterface $output)
+    {
+        if (null !== $input->getArgument('username') && null !== $input->getArgument('password') && null !== $input->getArgument('email') && null !== $input->getArgument('full-name')) {
+            return;
+        }
+
+        $this->io->title('Add User Command Interactive Wizard');
+        $this->io->text([
+            'If you prefer to not use this interactive wizard, provide the',
+            'arguments required by this command as follows:',
+            '',
+            ' $ php bin/console app:add-user username password email@example.com',
+            '',
+            'Now we\'ll ask you for the value of all the missing command arguments.',
+        ]);
+
+        // Ask for the username if it's not defined
+        $username = $input->getArgument('username');
+        if (null !== $username) {
+            $this->io->text(' > <info>Username</info>: '.$username);
+        } else {
+            $username = $this->io->ask('Username', null, [$this->validator, 'validateUsername']);
+            $input->setArgument('username', $username);
+        }
+
+        // Ask for the password if it's not defined
+        $password = $input->getArgument('password');
+        if (null !== $password) {
+            $this->io->text(' > <info>Password</info>: '.u('*')->repeat(u($password)->length()));
+        } else {
+            $password = $this->io->askHidden('Password (your type will be hidden)', [$this->validator, 'validatePassword']);
+            $input->setArgument('password', $password);
+        }
+
+        // Ask for the email if it's not defined
+        $email = $input->getArgument('email');
+        if (null !== $email) {
+            $this->io->text(' > <info>Email</info>: '.$email);
+        } else {
+            $email = $this->io->ask('Email', null, [$this->validator, 'validateEmail']);
+            $input->setArgument('email', $email);
+        }
+
+        // Ask for the full name if it's not defined
+        $fullName = $input->getArgument('full-name');
+        if (null !== $fullName) {
+            $this->io->text(' > <info>Full Name</info>: '.$fullName);
+        } else {
+            $fullName = $this->io->ask('Full Name', null, [$this->validator, 'validateFullName']);
+            $input->setArgument('full-name', $fullName);
+        }
+    }
+
+    /**
+     * This method is executed after interact() and initialize(). It usually
+     * contains the logic to execute to complete this command task.
+     */
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $stopwatch = new Stopwatch();
+        $stopwatch->start('add-user-command');
+
+        $username = $input->getArgument('username');
+        $plainPassword = $input->getArgument('password');
+        $email = $input->getArgument('email');
+        $fullName = $input->getArgument('full-name');
+        $isAdmin = $input->getOption('admin');
+
+        // make sure to validate the user data is correct
+        $this->validateUserData($username, $plainPassword, $email, $fullName);
+
+        // create the user and encode its password
+        $user = new User();
+        $user->setFullName($fullName);
+        $user->setUsername($username);
+        $user->setEmail($email);
+        $user->setRoles([$isAdmin ? 'ROLE_ADMIN' : 'ROLE_USER']);
+
+        // See https://symfony.com/doc/current/security.html#c-encoding-passwords
+        $encodedPassword = $this->passwordEncoder->encodePassword($user, $plainPassword);
+        $user->setPassword($encodedPassword);
+
+        $this->entityManager->persist($user);
+        $this->entityManager->flush();
+
+        $this->io->success(sprintf('%s was successfully created: %s (%s)', $isAdmin ? 'Administrator user' : 'User', $user->getUsername(), $user->getEmail()));
+
+        $event = $stopwatch->stop('add-user-command');
+        if ($output->isVerbose()) {
+            $this->io->comment(sprintf('New user database id: %d / Elapsed time: %.2f ms / Consumed memory: %.2f MB', $user->getId(), $event->getDuration(), $event->getMemory() / (1024 ** 2)));
+        }
+
+        return Command::SUCCESS;
+    }
+
+    private function validateUserData($username, $plainPassword, $email, $fullName): void
+    {
+        // first check if a user with the same username already exists.
+        $existingUser = $this->users->findOneBy(['username' => $username]);
+
+        if (null !== $existingUser) {
+            throw new RuntimeException(sprintf('There is already a user registered with the "%s" username.', $username));
+        }
+
+        // validate password and email if is not this input means interactive.
+        $this->validator->validatePassword($plainPassword);
+        $this->validator->validateEmail($email);
+        $this->validator->validateFullName($fullName);
+
+        // check if a user with the same email already exists.
+        $existingEmail = $this->users->findOneBy(['email' => $email]);
+
+        if (null !== $existingEmail) {
+            throw new RuntimeException(sprintf('There is already a user registered with the "%s" email.', $email));
+        }
+    }
+
+    /**
+     * The command help is usually included in the configure() method, but when
+     * it's too long, it's better to define a separate method to maintain the
+     * code readability.
+     */
+    private function getCommandHelp(): string
+    {
+        return <<<'HELP'
+The <info>%command.name%</info> command creates new users and saves them in the database:
+
+  <info>php %command.full_name%</info> <comment>username password email</comment>
+
+By default the command creates regular users. To create administrator users,
+add the <comment>--admin</comment> option:
+
+  <info>php %command.full_name%</info> username password email <comment>--admin</comment>
+
+If you omit any of the three required arguments, the command will ask you to
+provide the missing values:
+
+  # command will ask you for the email
+  <info>php %command.full_name%</info> <comment>username password</comment>
+
+  # command will ask you for the email and password
+  <info>php %command.full_name%</info> <comment>username</comment>
+
+  # command will ask you for all arguments
+  <info>php %command.full_name%</info>
+
+HELP;
+    }
+}

app/src/Command/DeleteUserCommand.php

@@ -0,0 +1,132 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Command;
+
+use App\Entity\User;
+use App\Repository\UserRepository;
+use App\Utils\Validator;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\RuntimeException;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+/**
+ * A console command that deletes users from the database.
+ *
+ * To use this command, open a terminal window, enter into your project
+ * directory and execute the following:
+ *
+ *     $ php bin/console app:delete-user
+ *
+ * Check out the code of the src/Command/AddUserCommand.php file for
+ * the full explanation about Symfony commands.
+ *
+ * See https://symfony.com/doc/current/console.html
+ *
+ * @author Oleg Voronkovich <oleg-voronkovich@yandex.ru>
+ */
+class DeleteUserCommand extends Command
+{
+    protected static $defaultName = 'app:delete-user';
+
+    /** @var SymfonyStyle */
+    private $io;
+    private $entityManager;
+    private $validator;
+    private $users;
+
+    public function __construct(EntityManagerInterface $em, Validator $validator, UserRepository $users)
+    {
+        parent::__construct();
+
+        $this->entityManager = $em;
+        $this->validator = $validator;
+        $this->users = $users;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure(): void
+    {
+        $this
+            ->setDescription('Deletes users from the database')
+            ->addArgument('username', InputArgument::REQUIRED, 'The username of an existing user')
+            ->setHelp(<<<'HELP'
+The <info>%command.name%</info> command deletes users from the database:
+
+  <info>php %command.full_name%</info> <comment>username</comment>
+
+If you omit the argument, the command will ask you to
+provide the missing value:
+
+  <info>php %command.full_name%</info>
+HELP
+            );
+    }
+
+    protected function initialize(InputInterface $input, OutputInterface $output): void
+    {
+        // SymfonyStyle is an optional feature that Symfony provides so you can
+        // apply a consistent look to the commands of your application.
+        // See https://symfony.com/doc/current/console/style.html
+        $this->io = new SymfonyStyle($input, $output);
+    }
+
+    protected function interact(InputInterface $input, OutputInterface $output)
+    {
+        if (null !== $input->getArgument('username')) {
+            return;
+        }
+
+        $this->io->title('Delete User Command Interactive Wizard');
+        $this->io->text([
+            'If you prefer to not use this interactive wizard, provide the',
+            'arguments required by this command as follows:',
+            '',
+            ' $ php bin/console app:delete-user username',
+            '',
+            'Now we\'ll ask you for the value of all the missing command arguments.',
+            '',
+        ]);
+
+        $username = $this->io->ask('Username', null, [$this->validator, 'validateUsername']);
+        $input->setArgument('username', $username);
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $username = $this->validator->validateUsername($input->getArgument('username'));
+
+        /** @var User $user */
+        $user = $this->users->findOneByUsername($username);
+
+        if (null === $user) {
+            throw new RuntimeException(sprintf('User with username "%s" not found.', $username));
+        }
+
+        // After an entity has been removed its in-memory state is the same
+        // as before the removal, except for generated identifiers.
+        // See https://www.doctrine-project.org/projects/doctrine-orm/en/latest/reference/working-with-objects.html#removing-entities
+        $userId = $user->getId();
+
+        $this->entityManager->remove($user);
+        $this->entityManager->flush();
+
+        $this->io->success(sprintf('User "%s" (ID: %d, email: %s) was successfully deleted.', $user->getUsername(), $userId, $user->getEmail()));
+
+        return Command::SUCCESS;
+    }
+}

app/src/Command/ListUsersCommand.php

@@ -0,0 +1,146 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Command;
+
+use App\Entity\User;
+use App\Repository\UserRepository;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\Mailer\MailerInterface;
+use Symfony\Component\Mime\Email;
+
+/**
+ * A console command that lists all the existing users.
+ *
+ * To use this command, open a terminal window, enter into your project directory
+ * and execute the following:
+ *
+ *     $ php bin/console app:list-users
+ *
+ * Check out the code of the src/Command/AddUserCommand.php file for
+ * the full explanation about Symfony commands.
+ *
+ * See https://symfony.com/doc/current/console.html
+ *
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class ListUsersCommand extends Command
+{
+    // a good practice is to use the 'app:' prefix to group all your custom application commands
+    protected static $defaultName = 'app:list-users';
+
+    private $mailer;
+    private $emailSender;
+    private $users;
+
+    public function __construct(MailerInterface $mailer, string $emailSender, UserRepository $users)
+    {
+        parent::__construct();
+
+        $this->mailer = $mailer;
+        $this->emailSender = $emailSender;
+        $this->users = $users;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure(): void
+    {
+        $this
+            ->setDescription('Lists all the existing users')
+            ->setHelp(<<<'HELP'
+The <info>%command.name%</info> command lists all the users registered in the application:
+
+  <info>php %command.full_name%</info>
+
+By default the command only displays the 50 most recent users. Set the number of
+results to display with the <comment>--max-results</comment> option:
+
+  <info>php %command.full_name%</info> <comment>--max-results=2000</comment>
+
+In addition to displaying the user list, you can also send this information to
+the email address specified in the <comment>--send-to</comment> option:
+
+  <info>php %command.full_name%</info> <comment>--send-to=fabien@symfony.com</comment>
+
+HELP
+            )
+            // commands can optionally define arguments and/or options (mandatory and optional)
+            // see https://symfony.com/doc/current/components/console/console_arguments.html
+            ->addOption('max-results', null, InputOption::VALUE_OPTIONAL, 'Limits the number of users listed', 50)
+            ->addOption('send-to', null, InputOption::VALUE_OPTIONAL, 'If set, the result is sent to the given email address')
+        ;
+    }
+
+    /**
+     * This method is executed after initialize(). It usually contains the logic
+     * to execute to complete this command task.
+     */
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $maxResults = $input->getOption('max-results');
+        // Use ->findBy() instead of ->findAll() to allow result sorting and limiting
+        $allUsers = $this->users->findBy([], ['id' => 'DESC'], $maxResults);
+
+        // Doctrine query returns an array of objects and we need an array of plain arrays
+        $usersAsPlainArrays = array_map(function (User $user) {
+            return [
+                $user->getId(),
+                $user->getFullName(),
+                $user->getUsername(),
+                $user->getEmail(),
+                implode(', ', $user->getRoles()),
+            ];
+        }, $allUsers);
+
+        // In your console commands you should always use the regular output type,
+        // which outputs contents directly in the console window. However, this
+        // command uses the BufferedOutput type instead, to be able to get the output
+        // contents before displaying them. This is needed because the command allows
+        // to send the list of users via email with the '--send-to' option
+        $bufferedOutput = new BufferedOutput();
+        $io = new SymfonyStyle($input, $bufferedOutput);
+        $io->table(
+            ['ID', 'Full Name', 'Username', 'Email', 'Roles'],
+            $usersAsPlainArrays
+        );
+
+        // instead of just displaying the table of users, store its contents in a variable
+        $usersAsATable = $bufferedOutput->fetch();
+        $output->write($usersAsATable);
+
+        if (null !== $email = $input->getOption('send-to')) {
+            $this->sendReport($usersAsATable, $email);
+        }
+
+        return Command::SUCCESS;
+    }
+
+    /**
+     * Sends the given $contents to the $recipient email address.
+     */
+    private function sendReport(string $contents, string $recipient): void
+    {
+        $email = (new Email())
+            ->from($this->emailSender)
+            ->to($recipient)
+            ->subject(sprintf('app:list-users report (%s)', date('Y-m-d H:i:s')))
+            ->text($contents);
+
+        $this->mailer->send($email);
+    }
+}

app/src/Controller/Admin/BlogController.php

@@ -0,0 +1,177 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller\Admin;
+
+use App\Entity\Post;
+use App\Form\PostType;
+use App\Repository\PostRepository;
+use App\Security\PostVoter;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\IsGranted;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\Form\Extension\Core\Type\SubmitType;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * Controller used to manage blog contents in the backend.
+ *
+ * Please note that the application backend is developed manually for learning
+ * purposes. However, in your real Symfony application you should use any of the
+ * existing bundles that let you generate ready-to-use backends without effort.
+ *
+ * See http://knpbundles.com/keyword/admin
+ *
+ * @Route("/admin/post")
+ * @IsGranted("ROLE_ADMIN")
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class BlogController extends AbstractController
+{
+    /**
+     * Lists all Post entities.
+     *
+     * This controller responds to two different routes with the same URL:
+     *   * 'admin_post_index' is the route with a name that follows the same
+     *     structure as the rest of the controllers of this class.
+     *   * 'admin_index' is a nice shortcut to the backend homepage. This allows
+     *     to create simpler links in the templates. Moreover, in the future we
+     *     could move this annotation to any other controller while maintaining
+     *     the route name and therefore, without breaking any existing link.
+     *
+     * @Route("/", methods="GET", name="admin_index")
+     * @Route("/", methods="GET", name="admin_post_index")
+     */
+    public function index(PostRepository $posts): Response
+    {
+        $authorPosts = $posts->findBy(['author' => $this->getUser()], ['publishedAt' => 'DESC']);
+
+        return $this->render('admin/blog/index.html.twig', ['posts' => $authorPosts]);
+    }
+
+    /**
+     * Creates a new Post entity.
+     *
+     * @Route("/new", methods="GET|POST", name="admin_post_new")
+     *
+     * NOTE: the Method annotation is optional, but it's a recommended practice
+     * to constraint the HTTP methods each controller responds to (by default
+     * it responds to all methods).
+     */
+    public function new(Request $request): Response
+    {
+        $post = new Post();
+        $post->setAuthor($this->getUser());
+
+        // See https://symfony.com/doc/current/form/multiple_buttons.html
+        $form = $this->createForm(PostType::class, $post)
+            ->add('saveAndCreateNew', SubmitType::class);
+
+        $form->handleRequest($request);
+
+        // the isSubmitted() method is completely optional because the other
+        // isValid() method already checks whether the form is submitted.
+        // However, we explicitly add it to improve code readability.
+        // See https://symfony.com/doc/current/forms.html#processing-forms
+        if ($form->isSubmitted() && $form->isValid()) {
+            $em = $this->getDoctrine()->getManager();
+            $em->persist($post);
+            $em->flush();
+
+            // Flash messages are used to notify the user about the result of the
+            // actions. They are deleted automatically from the session as soon
+            // as they are accessed.
+            // See https://symfony.com/doc/current/controller.html#flash-messages
+            $this->addFlash('success', 'post.created_successfully');
+
+            if ($form->get('saveAndCreateNew')->isClicked()) {
+                return $this->redirectToRoute('admin_post_new');
+            }
+
+            return $this->redirectToRoute('admin_post_index');
+        }
+
+        return $this->render('admin/blog/new.html.twig', [
+            'post' => $post,
+            'form' => $form->createView(),
+        ]);
+    }
+
+    /**
+     * Finds and displays a Post entity.
+     *
+     * @Route("/{id<\d+>}", methods="GET", name="admin_post_show")
+     */
+    public function show(Post $post): Response
+    {
+        // This security check can also be performed
+        // using an annotation: @IsGranted("show", subject="post", message="Posts can only be shown to their authors.")
+        $this->denyAccessUnlessGranted(PostVoter::SHOW, $post, 'Posts can only be shown to their authors.');
+
+        return $this->render('admin/blog/show.html.twig', [
+            'post' => $post,
+        ]);
+    }
+
+    /**
+     * Displays a form to edit an existing Post entity.
+     *
+     * @Route("/{id<\d+>}/edit", methods="GET|POST", name="admin_post_edit")
+     * @IsGranted("edit", subject="post", message="Posts can only be edited by their authors.")
+     */
+    public function edit(Request $request, Post $post): Response
+    {
+        $form = $this->createForm(PostType::class, $post);
+        $form->handleRequest($request);
+
+        if ($form->isSubmitted() && $form->isValid()) {
+            $this->getDoctrine()->getManager()->flush();
+
+            $this->addFlash('success', 'post.updated_successfully');
+
+            return $this->redirectToRoute('admin_post_edit', ['id' => $post->getId()]);
+        }
+
+        return $this->render('admin/blog/edit.html.twig', [
+            'post' => $post,
+            'form' => $form->createView(),
+        ]);
+    }
+
+    /**
+     * Deletes a Post entity.
+     *
+     * @Route("/{id}/delete", methods="POST", name="admin_post_delete")
+     * @IsGranted("delete", subject="post")
+     */
+    public function delete(Request $request, Post $post): Response
+    {
+        if (!$this->isCsrfTokenValid('delete', $request->request->get('token'))) {
+            return $this->redirectToRoute('admin_post_index');
+        }
+
+        // Delete the tags associated with this blog post. This is done automatically
+        // by Doctrine, except for SQLite (the database used in this application)
+        // because foreign key support is not enabled by default in SQLite
+        $post->getTags()->clear();
+
+        $em = $this->getDoctrine()->getManager();
+        $em->remove($post);
+        $em->flush();
+
+        $this->addFlash('success', 'post.deleted_successfully');
+
+        return $this->redirectToRoute('admin_post_index');
+    }
+}

app/src/Controller/BlogController.php

@@ -0,0 +1,170 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller;
+
+use App\Entity\Comment;
+use App\Entity\Post;
+use App\Event\CommentCreatedEvent;
+use App\Form\CommentType;
+use App\Repository\PostRepository;
+use App\Repository\TagRepository;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\IsGranted;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * Controller used to manage blog contents in the public part of the site.
+ *
+ * @Route("/blog")
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class BlogController extends AbstractController
+{
+    /**
+     * @Route("/", defaults={"page": "1", "_format"="html"}, methods="GET", name="blog_index")
+     * @Route("/rss.xml", defaults={"page": "1", "_format"="xml"}, methods="GET", name="blog_rss")
+     * @Route("/page/{page<[1-9]\d*>}", defaults={"_format"="html"}, methods="GET", name="blog_index_paginated")
+     * @Cache(smaxage="10")
+     *
+     * NOTE: For standard formats, Symfony will also automatically choose the best
+     * Content-Type header for the response.
+     * See https://symfony.com/doc/current/routing.html#special-parameters
+     */
+    public function index(Request $request, int $page, string $_format, PostRepository $posts, TagRepository $tags): Response
+    {
+        $tag = null;
+        if ($request->query->has('tag')) {
+            $tag = $tags->findOneBy(['name' => $request->query->get('tag')]);
+        }
+        $latestPosts = $posts->findLatest($page, $tag);
+
+        // Every template name also has two extensions that specify the format and
+        // engine for that template.
+        // See https://symfony.com/doc/current/templates.html#template-naming
+        return $this->render('blog/index.'.$_format.'.twig', [
+            'paginator' => $latestPosts,
+            'tagName' => $tag ? $tag->getName() : null,
+        ]);
+    }
+
+    /**
+     * @Route("/posts/{slug}", methods="GET", name="blog_post")
+     *
+     * NOTE: The $post controller argument is automatically injected by Symfony
+     * after performing a database query looking for a Post with the 'slug'
+     * value given in the route.
+     * See https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/converters.html
+     */
+    public function postShow(Post $post): Response
+    {
+        // Symfony's 'dump()' function is an improved version of PHP's 'var_dump()' but
+        // it's not available in the 'prod' environment to prevent leaking sensitive information.
+        // It can be used both in PHP files and Twig templates, but it requires to
+        // have enabled the DebugBundle. Uncomment the following line to see it in action:
+        //
+        // dump($post, $this->getUser(), new \DateTime());
+
+        return $this->render('blog/post_show.html.twig', ['post' => $post]);
+    }
+
+    /**
+     * @Route("/comment/{postSlug}/new", methods="POST", name="comment_new")
+     * @IsGranted("IS_AUTHENTICATED_FULLY")
+     * @ParamConverter("post", options={"mapping": {"postSlug": "slug"}})
+     *
+     * NOTE: The ParamConverter mapping is required because the route parameter
+     * (postSlug) doesn't match any of the Doctrine entity properties (slug).
+     * See https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/annotations/converters.html#doctrine-converter
+     */
+    public function commentNew(Request $request, Post $post, EventDispatcherInterface $eventDispatcher): Response
+    {
+        $comment = new Comment();
+        $comment->setAuthor($this->getUser());
+        $post->addComment($comment);
+
+        $form = $this->createForm(CommentType::class, $comment);
+        $form->handleRequest($request);
+
+        if ($form->isSubmitted() && $form->isValid()) {
+            $em = $this->getDoctrine()->getManager();
+            $em->persist($comment);
+            $em->flush();
+
+            // When an event is dispatched, Symfony notifies it to all the listeners
+            // and subscribers registered to it. Listeners can modify the information
+            // passed in the event and they can even modify the execution flow, so
+            // there's no guarantee that the rest of this controller will be executed.
+            // See https://symfony.com/doc/current/components/event_dispatcher.html
+            $eventDispatcher->dispatch(new CommentCreatedEvent($comment));
+
+            return $this->redirectToRoute('blog_post', ['slug' => $post->getSlug()]);
+        }
+
+        return $this->render('blog/comment_form_error.html.twig', [
+            'post' => $post,
+            'form' => $form->createView(),
+        ]);
+    }
+
+    /**
+     * This controller is called directly via the render() function in the
+     * blog/post_show.html.twig template. That's why it's not needed to define
+     * a route name for it.
+     *
+     * The "id" of the Post is passed in and then turned into a Post object
+     * automatically by the ParamConverter.
+     */
+    public function commentForm(Post $post): Response
+    {
+        $form = $this->createForm(CommentType::class);
+
+        return $this->render('blog/_comment_form.html.twig', [
+            'post' => $post,
+            'form' => $form->createView(),
+        ]);
+    }
+
+    /**
+     * @Route("/search", methods="GET", name="blog_search")
+     */
+    public function search(Request $request, PostRepository $posts): Response
+    {
+        $query = $request->query->get('q', '');
+        $limit = $request->query->get('l', 10);
+
+        if (!$request->isXmlHttpRequest()) {
+            return $this->render('blog/search.html.twig', ['query' => $query]);
+        }
+
+        $foundPosts = $posts->findBySearchQuery($query, $limit);
+
+        $results = [];
+        foreach ($foundPosts as $post) {
+            $results[] = [
+                'title' => htmlspecialchars($post->getTitle(), ENT_COMPAT | ENT_HTML5),
+                'date' => $post->getPublishedAt()->format('M d, Y'),
+                'author' => htmlspecialchars($post->getAuthor()->getFullName(), ENT_COMPAT | ENT_HTML5),
+                'summary' => htmlspecialchars($post->getSummary(), ENT_COMPAT | ENT_HTML5),
+                'url' => $this->generateUrl('blog_post', ['slug' => $post->getSlug()]),
+            ];
+        }
+
+        return $this->json($results);
+    }
+}

app/src/Controller/SecurityController.php

@@ -0,0 +1,69 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller;
+
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Http\Authentication\AuthenticationUtils;
+use Symfony\Component\Security\Http\Util\TargetPathTrait;
+
+/**
+ * Controller used to manage the application security.
+ * See https://symfony.com/doc/current/security/form_login_setup.html.
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class SecurityController extends AbstractController
+{
+    use TargetPathTrait;
+
+    /**
+     * @Route("/login", name="security_login")
+     */
+    public function login(Request $request, Security $security, AuthenticationUtils $helper): Response
+    {
+        // if user is already logged in, don't display the login page again
+        if ($security->isGranted('ROLE_USER')) {
+            return $this->redirectToRoute('blog_index');
+        }
+
+        // this statement solves an edge-case: if you change the locale in the login
+        // page, after a successful login you are redirected to a page in the previous
+        // locale. This code regenerates the referrer URL whenever the login page is
+        // browsed, to ensure that its locale is always the current one.
+        $this->saveTargetPath($request->getSession(), 'main', $this->generateUrl('admin_index'));
+
+        return $this->render('security/login.html.twig', [
+            // last username entered by the user (if any)
+            'last_username' => $helper->getLastUsername(),
+            // last authentication error (if any)
+            'error' => $helper->getLastAuthenticationError(),
+        ]);
+    }
+
+    /**
+     * This is the route the user can use to logout.
+     *
+     * But, this will never be executed. Symfony will intercept this first
+     * and handle the logout automatically. See logout in config/packages/security.yaml
+     *
+     * @Route("/logout", name="security_logout")
+     */
+    public function logout(): void
+    {
+        throw new \Exception('This should never be reached!');
+    }
+}

app/src/Controller/UserController.php

@@ -0,0 +1,79 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller;
+
+use App\Form\Type\ChangePasswordType;
+use App\Form\UserType;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\IsGranted;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Annotation\Route;
+use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
+
+/**
+ * Controller used to manage current user.
+ *
+ * @Route("/profile")
+ * @IsGranted("ROLE_USER")
+ *
+ * @author Romain Monteil <monteil.romain@gmail.com>
+ */
+class UserController extends AbstractController
+{
+    /**
+     * @Route("/edit", methods="GET|POST", name="user_edit")
+     */
+    public function edit(Request $request): Response
+    {
+        $user = $this->getUser();
+
+        $form = $this->createForm(UserType::class, $user);
+        $form->handleRequest($request);
+
+        if ($form->isSubmitted() && $form->isValid()) {
+            $this->getDoctrine()->getManager()->flush();
+
+            $this->addFlash('success', 'user.updated_successfully');
+
+            return $this->redirectToRoute('user_edit');
+        }
+
+        return $this->render('user/edit.html.twig', [
+            'user' => $user,
+            'form' => $form->createView(),
+        ]);
+    }
+
+    /**
+     * @Route("/change-password", methods="GET|POST", name="user_change_password")
+     */
+    public function changePassword(Request $request, UserPasswordEncoderInterface $encoder): Response
+    {
+        $user = $this->getUser();
+
+        $form = $this->createForm(ChangePasswordType::class);
+        $form->handleRequest($request);
+
+        if ($form->isSubmitted() && $form->isValid()) {
+            $user->setPassword($encoder->encodePassword($user, $form->get('newPassword')->getData()));
+
+            $this->getDoctrine()->getManager()->flush();
+
+            return $this->redirectToRoute('security_logout');
+        }
+
+        return $this->render('user/change_password.html.twig', [
+            'form' => $form->createView(),
+        ]);
+    }
+}

app/src/DataFixtures/AppFixtures.php

@@ -0,0 +1,241 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\DataFixtures;
+
+use App\Entity\Comment;
+use App\Entity\Post;
+use App\Entity\Tag;
+use App\Entity\User;
+use Doctrine\Bundle\FixturesBundle\Fixture;
+use Doctrine\Persistence\ObjectManager;
+use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
+use Symfony\Component\String\Slugger\SluggerInterface;
+use function Symfony\Component\String\u;
+
+class AppFixtures extends Fixture
+{
+    private $passwordEncoder;
+    private $slugger;
+
+    public function __construct(UserPasswordEncoderInterface $passwordEncoder, SluggerInterface $slugger)
+    {
+        $this->passwordEncoder = $passwordEncoder;
+        $this->slugger = $slugger;
+    }
+
+    public function load(ObjectManager $manager): void
+    {
+        $this->loadUsers($manager);
+        $this->loadTags($manager);
+        $this->loadPosts($manager);
+    }
+
+    private function loadUsers(ObjectManager $manager): void
+    {
+        foreach ($this->getUserData() as [$fullname, $username, $password, $email, $roles]) {
+            $user = new User();
+            $user->setFullName($fullname);
+            $user->setUsername($username);
+            $user->setPassword($this->passwordEncoder->encodePassword($user, $password));
+            $user->setEmail($email);
+            $user->setRoles($roles);
+
+            $manager->persist($user);
+            $this->addReference($username, $user);
+        }
+
+        $manager->flush();
+    }
+
+    private function loadTags(ObjectManager $manager): void
+    {
+        foreach ($this->getTagData() as $index => $name) {
+            $tag = new Tag();
+            $tag->setName($name);
+
+            $manager->persist($tag);
+            $this->addReference('tag-'.$name, $tag);
+        }
+
+        $manager->flush();
+    }
+
+    private function loadPosts(ObjectManager $manager): void
+    {
+        foreach ($this->getPostData() as [$title, $slug, $summary, $content, $publishedAt, $author, $tags]) {
+            $post = new Post();
+            $post->setTitle($title);
+            $post->setSlug($slug);
+            $post->setSummary($summary);
+            $post->setContent($content);
+            $post->setPublishedAt($publishedAt);
+            $post->setAuthor($author);
+            $post->addTag(...$tags);
+
+            foreach (range(1, 5) as $i) {
+                $comment = new Comment();
+                $comment->setAuthor($this->getReference('john_user'));
+                $comment->setContent($this->getRandomText(random_int(255, 512)));
+                $comment->setPublishedAt(new \DateTime('now + '.$i.'seconds'));
+
+                $post->addComment($comment);
+            }
+
+            $manager->persist($post);
+        }
+
+        $manager->flush();
+    }
+
+    private function getUserData(): array
+    {
+        return [
+            // $userData = [$fullname, $username, $password, $email, $roles];
+            ['Jane Doe', 'jane_admin', 'kitten', 'jane_admin@symfony.com', ['ROLE_ADMIN']],
+            ['Tom Doe', 'tom_admin', 'kitten', 'tom_admin@symfony.com', ['ROLE_ADMIN']],
+            ['John Doe', 'john_user', 'kitten', 'john_user@symfony.com', ['ROLE_USER']],
+        ];
+    }
+
+    private function getTagData(): array
+    {
+        return [
+            'lorem',
+            'ipsum',
+            'consectetur',
+            'adipiscing',
+            'incididunt',
+            'labore',
+            'voluptate',
+            'dolore',
+            'pariatur',
+        ];
+    }
+
+    private function getPostData()
+    {
+        $posts = [];
+        foreach ($this->getPhrases() as $i => $title) {
+            // $postData = [$title, $slug, $summary, $content, $publishedAt, $author, $tags, $comments];
+            $posts[] = [
+                $title,
+                $this->slugger->slug($title)->lower(),
+                $this->getRandomText(),
+                $this->getPostContent(),
+                new \DateTime('now - '.$i.'days'),
+                // Ensure that the first post is written by Jane Doe to simplify tests
+                $this->getReference(['jane_admin', 'tom_admin'][0 === $i ? 0 : random_int(0, 1)]),
+                $this->getRandomTags(),
+            ];
+        }
+
+        return $posts;
+    }
+
+    private function getPhrases(): array
+    {
+        return [
+            'Lorem ipsum dolor sit amet consectetur adipiscing elit',
+            'Pellentesque vitae velit ex',
+            'Mauris dapibus risus quis suscipit vulputate',
+            'Eros diam egestas libero eu vulputate risus',
+            'In hac habitasse platea dictumst',
+            'Morbi tempus commodo mattis',
+            'Ut suscipit posuere justo at vulputate',
+            'Ut eleifend mauris et risus ultrices egestas',
+            'Aliquam sodales odio id eleifend tristique',
+            'Urna nisl sollicitudin id varius orci quam id turpis',
+            'Nulla porta lobortis ligula vel egestas',
+            'Curabitur aliquam euismod dolor non ornare',
+            'Sed varius a risus eget aliquam',
+            'Nunc viverra elit ac laoreet suscipit',
+            'Pellentesque et sapien pulvinar consectetur',
+            'Ubi est barbatus nix',
+            'Abnobas sunt hilotaes de placidus vita',
+            'Ubi est audax amicitia',
+            'Eposs sunt solems de superbus fortis',
+            'Vae humani generis',
+            'Diatrias tolerare tanquam noster caesium',
+            'Teres talis saepe tractare de camerarius flavum sensorem',
+            'Silva de secundus galatae demitto quadra',
+            'Sunt accentores vitare salvus flavum parses',
+            'Potus sensim ad ferox abnoba',
+            'Sunt seculaes transferre talis camerarius fluctuies',
+            'Era brevis ratione est',
+            'Sunt torquises imitari velox mirabilis medicinaes',
+            'Mineralis persuadere omnes finises desiderium',
+            'Bassus fatalis classiss virtualiter transferre de flavum',
+        ];
+    }
+
+    private function getRandomText(int $maxLength = 255): string
+    {
+        $phrases = $this->getPhrases();
+        shuffle($phrases);
+
+        do {
+            $text = u('. ')->join($phrases)->append('.');
+            array_pop($phrases);
+        } while ($text->length() > $maxLength);
+
+        return $text;
+    }
+
+    private function getPostContent(): string
+    {
+        return <<<'MARKDOWN'
+Lorem ipsum dolor sit amet consectetur adipisicing elit, sed do eiusmod tempor
+incididunt ut labore et **dolore magna aliqua**: Duis aute irure dolor in
+reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
+Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia
+deserunt mollit anim id est laborum.
+
+  * Ut enim ad minim veniam
+  * Quis nostrud exercitation *ullamco laboris*
+  * Nisi ut aliquip ex ea commodo consequat
+
+Praesent id fermentum lorem. Ut est lorem, fringilla at accumsan nec, euismod at
+nunc. Aenean mattis sollicitudin mattis. Nullam pulvinar vestibulum bibendum.
+Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos
+himenaeos. Fusce nulla purus, gravida ac interdum ut, blandit eget ex. Duis a
+luctus dolor.
+
+Integer auctor massa maximus nulla scelerisque accumsan. *Aliquam ac malesuada*
+ex. Pellentesque tortor magna, vulputate eu vulputate ut, venenatis ac lectus.
+Praesent ut lacinia sem. Mauris a lectus eget felis mollis feugiat. Quisque
+efficitur, mi ut semper pulvinar, urna urna blandit massa, eget tincidunt augue
+nulla vitae est.
+
+Ut posuere aliquet tincidunt. Aliquam erat volutpat. **Class aptent taciti**
+sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi
+arcu orci, gravida eget aliquam eu, suscipit et ante. Morbi vulputate metus vel
+ipsum finibus, ut dapibus massa feugiat. Vestibulum vel lobortis libero. Sed
+tincidunt tellus et viverra scelerisque. Pellentesque tincidunt cursus felis.
+Sed in egestas erat.
+
+Aliquam pulvinar interdum massa, vel ullamcorper ante consectetur eu. Vestibulum
+lacinia ac enim vel placerat. Integer pulvinar magna nec dui malesuada, nec
+congue nisl dictum. Donec mollis nisl tortor, at congue erat consequat a. Nam
+tempus elit porta, blandit elit vel, viverra lorem. Sed sit amet tellus
+tincidunt, faucibus nisl in, aliquet libero.
+MARKDOWN;
+    }
+
+    private function getRandomTags(): array
+    {
+        $tagNames = $this->getTagData();
+        shuffle($tagNames);
+        $selectedTags = \array_slice($tagNames, 0, random_int(2, 4));
+
+        return array_map(function ($tagName) { return $this->getReference('tag-'.$tagName); }, $selectedTags);
+    }
+}

app/src/Entity/Comment.php

@@ -0,0 +1,138 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use function Symfony\Component\String\u;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * @ORM\Entity
+ * @ORM\Table(name="symfony_demo_comment")
+ *
+ * Defines the properties of the Comment entity to represent the blog comments.
+ * See https://symfony.com/doc/current/doctrine.html#creating-an-entity-class
+ *
+ * Tip: if you have an existing database, you can generate these entity class automatically.
+ * See https://symfony.com/doc/current/doctrine/reverse_engineering.html
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class Comment
+{
+    /**
+     * @var int
+     *
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     * @ORM\Column(type="integer")
+     */
+    private $id;
+
+    /**
+     * @var Post
+     *
+     * @ORM\ManyToOne(targetEntity="Post", inversedBy="comments")
+     * @ORM\JoinColumn(nullable=false)
+     */
+    private $post;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="text")
+     * @Assert\NotBlank(message="comment.blank")
+     * @Assert\Length(
+     *     min=5,
+     *     minMessage="comment.too_short",
+     *     max=10000,
+     *     maxMessage="comment.too_long"
+     * )
+     */
+    private $content;
+
+    /**
+     * @var \DateTime
+     *
+     * @ORM\Column(type="datetime")
+     */
+    private $publishedAt;
+
+    /**
+     * @var User
+     *
+     * @ORM\ManyToOne(targetEntity="App\Entity\User")
+     * @ORM\JoinColumn(nullable=false)
+     */
+    private $author;
+
+    public function __construct()
+    {
+        $this->publishedAt = new \DateTime();
+    }
+
+    /**
+     * @Assert\IsTrue(message="comment.is_spam")
+     */
+    public function isLegitComment(): bool
+    {
+        $containsInvalidCharacters = null !== u($this->content)->indexOf('@');
+
+        return !$containsInvalidCharacters;
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getContent(): ?string
+    {
+        return $this->content;
+    }
+
+    public function setContent(string $content): void
+    {
+        $this->content = $content;
+    }
+
+    public function getPublishedAt(): \DateTime
+    {
+        return $this->publishedAt;
+    }
+
+    public function setPublishedAt(\DateTime $publishedAt): void
+    {
+        $this->publishedAt = $publishedAt;
+    }
+
+    public function getAuthor(): ?User
+    {
+        return $this->author;
+    }
+
+    public function setAuthor(User $author): void
+    {
+        $this->author = $author;
+    }
+
+    public function getPost(): ?Post
+    {
+        return $this->post;
+    }
+
+    public function setPost(Post $post): void
+    {
+        $this->post = $post;
+    }
+}

app/src/Entity/Post.php

@@ -0,0 +1,226 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Entity;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * @ORM\Entity(repositoryClass="App\Repository\PostRepository")
+ * @ORM\Table(name="symfony_demo_post")
+ * @UniqueEntity(fields={"slug"}, errorPath="title", message="post.slug_unique")
+ *
+ * Defines the properties of the Post entity to represent the blog posts.
+ *
+ * See https://symfony.com/doc/current/doctrine.html#creating-an-entity-class
+ *
+ * Tip: if you have an existing database, you can generate these entity class automatically.
+ * See https://symfony.com/doc/current/doctrine/reverse_engineering.html
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+class Post
+{
+    /**
+     * @var int
+     *
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     * @ORM\Column(type="integer")
+     */
+    private $id;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     * @Assert\NotBlank
+     */
+    private $title;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     */
+    private $slug;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     * @Assert\NotBlank(message="post.blank_summary")
+     * @Assert\Length(max=255)
+     */
+    private $summary;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="text")
+     * @Assert\NotBlank(message="post.blank_content")
+     * @Assert\Length(min=10, minMessage="post.too_short_content")
+     */
+    private $content;
+
+    /**
+     * @var \DateTime
+     *
+     * @ORM\Column(type="datetime")
+     */
+    private $publishedAt;
+
+    /**
+     * @var User
+     *
+     * @ORM\ManyToOne(targetEntity="App\Entity\User")
+     * @ORM\JoinColumn(nullable=false)
+     */
+    private $author;
+
+    /**
+     * @var Comment[]|Collection
+     *
+     * @ORM\OneToMany(
+     *      targetEntity="Comment",
+     *      mappedBy="post",
+     *      orphanRemoval=true,
+     *      cascade={"persist"}
+     * )
+     * @ORM\OrderBy({"publishedAt": "DESC"})
+     */
+    private $comments;
+
+    /**
+     * @var Tag[]|Collection
+     *
+     * @ORM\ManyToMany(targetEntity="App\Entity\Tag", cascade={"persist"})
+     * @ORM\JoinTable(name="symfony_demo_post_tag")
+     * @ORM\OrderBy({"name": "ASC"})
+     * @Assert\Count(max="4", maxMessage="post.too_many_tags")
+     */
+    private $tags;
+
+    public function __construct()
+    {
+        $this->publishedAt = new \DateTime();
+        $this->comments = new ArrayCollection();
+        $this->tags = new ArrayCollection();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getTitle(): ?string
+    {
+        return $this->title;
+    }
+
+    public function setTitle(?string $title): void
+    {
+        $this->title = $title;
+    }
+
+    public function getSlug(): ?string
+    {
+        return $this->slug;
+    }
+
+    public function setSlug(string $slug): void
+    {
+        $this->slug = $slug;
+    }
+
+    public function getContent(): ?string
+    {
+        return $this->content;
+    }
+
+    public function setContent(?string $content): void
+    {
+        $this->content = $content;
+    }
+
+    public function getPublishedAt(): \DateTime
+    {
+        return $this->publishedAt;
+    }
+
+    public function setPublishedAt(\DateTime $publishedAt): void
+    {
+        $this->publishedAt = $publishedAt;
+    }
+
+    public function getAuthor(): ?User
+    {
+        return $this->author;
+    }
+
+    public function setAuthor(User $author): void
+    {
+        $this->author = $author;
+    }
+
+    public function getComments(): Collection
+    {
+        return $this->comments;
+    }
+
+    public function addComment(Comment $comment): void
+    {
+        $comment->setPost($this);
+        if (!$this->comments->contains($comment)) {
+            $this->comments->add($comment);
+        }
+    }
+
+    public function removeComment(Comment $comment): void
+    {
+        $this->comments->removeElement($comment);
+    }
+
+    public function getSummary(): ?string
+    {
+        return $this->summary;
+    }
+
+    public function setSummary(?string $summary): void
+    {
+        $this->summary = $summary;
+    }
+
+    public function addTag(Tag ...$tags): void
+    {
+        foreach ($tags as $tag) {
+            if (!$this->tags->contains($tag)) {
+                $this->tags->add($tag);
+            }
+        }
+    }
+
+    public function removeTag(Tag $tag): void
+    {
+        $this->tags->removeElement($tag);
+    }
+
+    public function getTags(): Collection
+    {
+        return $this->tags;
+    }
+}

app/src/Entity/Tag.php

@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @ORM\Entity()
+ * @ORM\Table(name="symfony_demo_tag")
+ *
+ * Defines the properties of the Tag entity to represent the post tags.
+ *
+ * See https://symfony.com/doc/current/doctrine.html#creating-an-entity-class
+ *
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+class Tag implements \JsonSerializable
+{
+    /**
+     * @var int
+     *
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     * @ORM\Column(type="integer")
+     */
+    private $id;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string", unique=true)
+     */
+    private $name;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function setName(string $name): void
+    {
+        $this->name = $name;
+    }
+
+    public function getName(): ?string
+    {
+        return $this->name;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function jsonSerialize(): string
+    {
+        // This entity implements JsonSerializable (http://php.net/manual/en/class.jsonserializable.php)
+        // so this method is used to customize its JSON representation when json_encode()
+        // is called, for example in tags|json_encode (templates/form/fields.html.twig)
+
+        return $this->name;
+    }
+
+    public function __toString(): string
+    {
+        return $this->name;
+    }
+}

app/src/Entity/User.php

@@ -0,0 +1,188 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * @ORM\Entity(repositoryClass="App\Repository\UserRepository")
+ * @ORM\Table(name="symfony_demo_user")
+ *
+ * Defines the properties of the User entity to represent the application users.
+ * See https://symfony.com/doc/current/doctrine.html#creating-an-entity-class
+ *
+ * Tip: if you have an existing database, you can generate these entity class automatically.
+ * See https://symfony.com/doc/current/doctrine/reverse_engineering.html
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class User implements UserInterface, \Serializable
+{
+    /**
+     * @var int
+     *
+     * @ORM\Id
+     * @ORM\GeneratedValue
+     * @ORM\Column(type="integer")
+     */
+    private $id;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     * @Assert\NotBlank()
+     */
+    private $fullName;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string", unique=true)
+     * @Assert\NotBlank()
+     * @Assert\Length(min=2, max=50)
+     */
+    private $username;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string", unique=true)
+     * @Assert\Email()
+     */
+    private $email;
+
+    /**
+     * @var string
+     *
+     * @ORM\Column(type="string")
+     */
+    private $password;
+
+    /**
+     * @var array
+     *
+     * @ORM\Column(type="json")
+     */
+    private $roles = [];
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function setFullName(string $fullName): void
+    {
+        $this->fullName = $fullName;
+    }
+
+    public function getFullName(): ?string
+    {
+        return $this->fullName;
+    }
+
+    public function getUsername(): ?string
+    {
+        return $this->username;
+    }
+
+    public function setUsername(string $username): void
+    {
+        $this->username = $username;
+    }
+
+    public function getEmail(): ?string
+    {
+        return $this->email;
+    }
+
+    public function setEmail(string $email): void
+    {
+        $this->email = $email;
+    }
+
+    public function getPassword(): ?string
+    {
+        return $this->password;
+    }
+
+    public function setPassword(string $password): void
+    {
+        $this->password = $password;
+    }
+
+    /**
+     * Returns the roles or permissions granted to the user for security.
+     */
+    public function getRoles(): array
+    {
+        $roles = $this->roles;
+
+        // guarantees that a user always has at least one role for security
+        if (empty($roles)) {
+            $roles[] = 'ROLE_USER';
+        }
+
+        return array_unique($roles);
+    }
+
+    public function setRoles(array $roles): void
+    {
+        $this->roles = $roles;
+    }
+
+    /**
+     * Returns the salt that was originally used to encode the password.
+     *
+     * {@inheritdoc}
+     */
+    public function getSalt(): ?string
+    {
+        // We're using bcrypt in security.yaml to encode the password, so
+        // the salt value is built-in and and you don't have to generate one
+        // See https://en.wikipedia.org/wiki/Bcrypt
+
+        return null;
+    }
+
+    /**
+     * Removes sensitive data from the user.
+     *
+     * {@inheritdoc}
+     */
+    public function eraseCredentials(): void
+    {
+        // if you had a plainPassword property, you'd nullify it here
+        // $this->plainPassword = null;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function serialize(): string
+    {
+        // add $this->salt too if you don't use Bcrypt or Argon2i
+        return serialize([$this->id, $this->username, $this->password]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function unserialize($serialized): void
+    {
+        // add $this->salt too if you don't use Bcrypt or Argon2i
+        [$this->id, $this->username, $this->password] = unserialize($serialized, ['allowed_classes' => false]);
+    }
+}

app/src/Event/CommentCreatedEvent.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Event;
+
+use App\Entity\Comment;
+use Symfony\Contracts\EventDispatcher\Event;
+
+class CommentCreatedEvent extends Event
+{
+    protected $comment;
+
+    public function __construct(Comment $comment)
+    {
+        $this->comment = $comment;
+    }
+
+    public function getComment(): Comment
+    {
+        return $this->comment;
+    }
+}

app/src/EventSubscriber/CheckRequirementsSubscriber.php

@@ -0,0 +1,101 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\EventSubscriber;
+
+use Doctrine\DBAL\Exception\DriverException;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Console\ConsoleEvents;
+use Symfony\Component\Console\Event\ConsoleErrorEvent;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\ExceptionEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * This application uses by default an SQLite database to store its information.
+ * That's why the 'sqlite3' extension must be enabled in PHP. This event
+ * subscriber listens to console events and in case of an exception caused by
+ * a disabled 'sqlite3' extension, it displays a meaningful error message.
+ *
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class CheckRequirementsSubscriber implements EventSubscriberInterface
+{
+    private $entityManager;
+
+    public function __construct(EntityManagerInterface $entityManager)
+    {
+        $this->entityManager = $entityManager;
+    }
+
+    // Event Subscribers must define this method to declare the events they
+    // listen to. You can listen to several events, execute more than one method
+    // for each event and set the priority of each event too.
+    // See https://symfony.com/doc/current/event_dispatcher.html#creating-an-event-subscriber
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            // Errors are one of the events defined by the Console. See the
+            // rest here: https://symfony.com/doc/current/components/console/events.html
+            ConsoleEvents::ERROR => 'handleConsoleError',
+            // See: https://symfony.com/doc/current/components/http_kernel.html#component-http-kernel-event-table
+            KernelEvents::EXCEPTION => 'handleKernelException',
+        ];
+    }
+
+    /**
+     * This method checks if there has been an error in a command related to
+     * the database and then, it checks if the 'sqlite3' PHP extension is enabled
+     * or not to display a better error message.
+     */
+    public function handleConsoleError(ConsoleErrorEvent $event): void
+    {
+        $commandNames = ['doctrine:fixtures:load', 'doctrine:database:create', 'doctrine:schema:create', 'doctrine:database:drop'];
+
+        if ($event->getCommand() && \in_array($event->getCommand()->getName(), $commandNames, true)) {
+            if ($this->isSQLitePlatform() && !\extension_loaded('sqlite3')) {
+                $io = new SymfonyStyle($event->getInput(), $event->getOutput());
+                $io->error('This command requires to have the "sqlite3" PHP extension enabled because, by default, the Symfony Demo application uses SQLite to store its information.');
+            }
+        }
+    }
+
+    /**
+     * This method checks if the triggered exception is related to the database
+     * and then, it checks if the required 'sqlite3' PHP extension is enabled.
+     */
+    public function handleKernelException(ExceptionEvent $event): void
+    {
+        $exception = $event->getThrowable();
+        // Since any exception thrown during a Twig template rendering is wrapped
+        // in a Twig_Error_Runtime, we must get the original exception.
+        $previousException = $exception->getPrevious();
+
+        // Driver exception may happen in controller or in twig template rendering
+        $isDriverException = ($exception instanceof DriverException || $previousException instanceof DriverException);
+
+        // Check if SQLite is enabled
+        if ($isDriverException && $this->isSQLitePlatform() && !\extension_loaded('sqlite3')) {
+            $event->setThrowable(new \Exception('PHP extension "sqlite3" must be enabled because, by default, the Symfony Demo application uses SQLite to store its information.'));
+        }
+    }
+
+    /**
+     * Checks if the application is using SQLite as its database.
+     */
+    private function isSQLitePlatform(): bool
+    {
+        $databasePlatform = $this->entityManager->getConnection()->getDatabasePlatform();
+
+        return $databasePlatform ? 'sqlite' === $databasePlatform->getName() : false;
+    }
+}

app/src/EventSubscriber/CommentNotificationSubscriber.php

@@ -0,0 +1,79 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\EventSubscriber;
+
+use App\Entity\Comment;
+use App\Event\CommentCreatedEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Mailer\MailerInterface;
+use Symfony\Component\Mime\Email;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
+
+/**
+ * Notifies post's author about new comments.
+ *
+ * @author Oleg Voronkovich <oleg-voronkovich@yandex.ru>
+ */
+class CommentNotificationSubscriber implements EventSubscriberInterface
+{
+    private $mailer;
+    private $translator;
+    private $urlGenerator;
+    private $sender;
+
+    public function __construct(MailerInterface $mailer, UrlGeneratorInterface $urlGenerator, TranslatorInterface $translator, string $sender)
+    {
+        $this->mailer = $mailer;
+        $this->urlGenerator = $urlGenerator;
+        $this->translator = $translator;
+        $this->sender = $sender;
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            CommentCreatedEvent::class => 'onCommentCreated',
+        ];
+    }
+
+    public function onCommentCreated(CommentCreatedEvent $event): void
+    {
+        /** @var Comment $comment */
+        $comment = $event->getComment();
+        $post = $comment->getPost();
+
+        $linkToPost = $this->urlGenerator->generate('blog_post', [
+            'slug' => $post->getSlug(),
+            '_fragment' => 'comment_'.$comment->getId(),
+        ], UrlGeneratorInterface::ABSOLUTE_URL);
+
+        $subject = $this->translator->trans('notification.comment_created');
+        $body = $this->translator->trans('notification.comment_created.description', [
+            '%title%' => $post->getTitle(),
+            '%link%' => $linkToPost,
+        ]);
+
+        // See https://symfony.com/doc/current/mailer.html
+        $email = (new Email())
+            ->from($this->sender)
+            ->to($post->getAuthor()->getEmail())
+            ->subject($subject)
+            ->html($body)
+        ;
+
+        // In config/packages/dev/mailer.yaml the delivery of messages is disabled.
+        // That's why in the development environment you won't actually receive any email.
+        // However, you can inspect the contents of those unsent emails using the debug toolbar.
+        $this->mailer->send($email);
+    }
+}

app/src/EventSubscriber/ControllerSubscriber.php

@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\EventSubscriber;
+
+use App\Twig\SourceCodeExtension;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\ControllerEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Defines the method that 'listens' to the 'kernel.controller' event, which is
+ * triggered whenever a controller is executed in the application.
+ *
+ * @author Ryan Weaver <weaverryan@gmail.com>
+ * @author Javier Eguiluz <javier.eguiluz@gmail.com>
+ */
+class ControllerSubscriber implements EventSubscriberInterface
+{
+    private $twigExtension;
+
+    public function __construct(SourceCodeExtension $twigExtension)
+    {
+        $this->twigExtension = $twigExtension;
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            KernelEvents::CONTROLLER => 'registerCurrentController',
+        ];
+    }
+
+    public function registerCurrentController(ControllerEvent $event): void
+    {
+        // this check is needed because in Symfony a request can perform any
+        // number of sub-requests. See
+        // https://symfony.com/doc/current/components/http_kernel.html#sub-requests
+        if ($event->isMasterRequest()) {
+            $this->twigExtension->setController($event->getController());
+        }
+    }
+}

app/src/EventSubscriber/RedirectToPreferredLocaleSubscriber.php

@@ -0,0 +1,86 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\EventSubscriber;
+
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use function Symfony\Component\String\u;
+
+/**
+ * When visiting the homepage, this listener redirects the user to the most
+ * appropriate localized version according to the browser settings.
+ *
+ * See https://symfony.com/doc/current/components/http_kernel.html#the-kernel-request-event
+ *
+ * @author Oleg Voronkovich <oleg-voronkovich@yandex.ru>
+ */
+class RedirectToPreferredLocaleSubscriber implements EventSubscriberInterface
+{
+    private $urlGenerator;
+    private $locales;
+    private $defaultLocale;
+
+    public function __construct(UrlGeneratorInterface $urlGenerator, string $locales, string $defaultLocale = null)
+    {
+        $this->urlGenerator = $urlGenerator;
+
+        $this->locales = explode('|', trim($locales));
+        if (empty($this->locales)) {
+            throw new \UnexpectedValueException('The list of supported locales must not be empty.');
+        }
+
+        $this->defaultLocale = $defaultLocale ?: $this->locales[0];
+
+        if (!\in_array($this->defaultLocale, $this->locales, true)) {
+            throw new \UnexpectedValueException(sprintf('The default locale ("%s") must be one of "%s".', $this->defaultLocale, $locales));
+        }
+
+        // Add the default locale at the first position of the array,
+        // because Symfony\HttpFoundation\Request::getPreferredLanguage
+        // returns the first element when no an appropriate language is found
+        array_unshift($this->locales, $this->defaultLocale);
+        $this->locales = array_unique($this->locales);
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            KernelEvents::REQUEST => 'onKernelRequest',
+        ];
+    }
+
+    public function onKernelRequest(RequestEvent $event): void
+    {
+        $request = $event->getRequest();
+
+        // Ignore sub-requests and all URLs but the homepage
+        if (!$event->isMasterRequest() || '/' !== $request->getPathInfo()) {
+            return;
+        }
+        // Ignore requests from referrers with the same HTTP host in order to prevent
+        // changing language for users who possibly already selected it for this application.
+        $referrer = $request->headers->get('referer');
+        if (null !== $referrer && u($referrer)->ignoreCase()->startsWith($request->getSchemeAndHttpHost())) {
+            return;
+        }
+
+        $preferredLanguage = $request->getPreferredLanguage($this->locales);
+
+        if ($preferredLanguage !== $this->defaultLocale) {
+            $response = new RedirectResponse($this->urlGenerator->generate('homepage', ['_locale' => $preferredLanguage]));
+            $event->setResponse($response);
+        }
+    }
+}