KantSites/tests/EditorSecurityTest.php

<?php

namespace App\Tests;

use App\Content\DemoContent;
use App\Content\DocumentValidator;
use App\Content\FormRepository;
use App\Content\MediaLibrary;
use App\Content\MenuRepository;
use App\Content\PageRepository;
use App\Content\PartialRepository;
use App\Content\SiteSettings;
use App\Infrastructure\ConnectionFactory;
use App\Kernel;
use App\Security\UserProvider;
use Doctrine\DBAL\Connection;
use PHPUnit\Framework\Attributes\DataProvider;
use Symfony\Bundle\FrameworkBundle\KernelBrowser;
use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Symfony\Component\HttpFoundation\File\UploadedFile;

final class EditorSecurityTest extends WebTestCase
{
    private Connection $db;
    private string $path;
    private array $previous;

    protected static function getKernelClass(): string
    {
        return Kernel::class;
    }

    protected function setUp(): void
    {
        $this->path = tempnam(sys_get_temp_dir(), 'kant-auth-');
        $url = 'sqlite:///'.str_replace('\\', '/', $this->path);
        $this->previous = [$_SERVER, $_ENV];
        foreach (['APP_SECRET' => 'isolated-test-secret', 'DATABASE_URL' => $url, 'SITE_ORIGIN' => 'https://cms.test', 'MEDIA_DIRECTORY' => $this->path.'-media'] as $key => $value) {
            $_SERVER[$key] = $_ENV[$key] = $value;
        }
        $this->db = ConnectionFactory::create($url);
        TestSchema::build($this->db);
        $this->db->insert('website', ['id' => 'default', 'name' => 'Test', 'default_locale' => 'de', 'theme' => '{}']);
        $this->db->insert('page', ['id' => 'p1', 'slug' => 'home', 'path' => 'home', 'type' => 'page', 'locale' => 'de', 'website_id' => 'default', 'version' => 0, 'created_at' => gmdate('Y-m-d H:i:s')]);
        $pages = new PageRepository($this->db, new DocumentValidator(), new SiteSettings($this->db));
        $revision = $pages->saveDraft('p1', DemoContent::pages()['home'], 0);
        $pages->publish('p1', $revision, 1);
        // The navigation is part of the header area, so the fixture needs one.
        $partials = new PartialRepository($this->db, new DocumentValidator());
        foreach (DemoContent::areas() as $kind => $area) {
            $partials->create($kind, 'default', $area['name'], $area['document']);
        }
        foreach (['admin' => 'ROLE_ADMIN', 'editor' => 'ROLE_EDITOR'] as $username => $role) {
            $this->db->insert('cms_user', ['id' => $username, 'username' => $username, 'password_hash' => password_hash('Fixture-only-password', PASSWORD_BCRYPT, ['cost' => 4]), 'roles' => json_encode([$role])]);
        }
    }

    protected function tearDown(): void
    {
        parent::tearDown();
        $this->db->close();
        gc_collect_cycles();
        unlink($this->path);
        foreach (glob($this->path.'-media/*') ?: [] as $file) {
            unlink($file);
        }
        if (is_dir($this->path.'-media')) {
            rmdir($this->path.'-media');
        }
        [$_SERVER, $_ENV] = $this->previous;
    }

    private function login(string $username = 'admin'): KernelBrowser
    {
        $client = self::createClient();
        $crawler = $client->request('GET', '/admin/login');
        $client->submit($crawler->selectButton('Anmelden')->form(['_username' => $username, '_password' => 'Fixture-only-password']));
        self::assertResponseRedirects('/admin');
        $client->followRedirect();
        self::assertResponseIsSuccessful();

        return $client;
    }

    private function data(KernelBrowser $client): array
    {
        $client->request('GET', '/admin/api/pages/p1');
        self::assertResponseIsSuccessful();

        return json_decode($client->getResponse()->getContent(), true, 512, JSON_THROW_ON_ERROR);
    }

    private function post(KernelBrowser $client, string $action, array $data, string $token = ''): void
    {
        $client->request('POST', '/admin/api/pages/p1/'.$action, server: ['CONTENT_TYPE' => 'application/json', 'HTTP_X_CSRF_TOKEN' => $token], content: json_encode($data));
    }

    public function testAnonymousCannotReadDraftOrWrite(): void
    {
        $client = self::createClient();
        foreach (['/admin', '/admin/pages/p1', '/admin/api/pages/p1', '/admin/media', '/admin/api/media', '/admin/menus', '/admin/forms'] as $url) {
            $client->request('GET', $url);
            self::assertResponseRedirects('http://localhost/admin/login');
            self::assertStringNotContainsString('schemaVersion', $client->getResponse()->getContent());
        }
        foreach (['draft', 'publish', 'preview'] as $action) {
            $this->post($client, $action, []);
            self::assertResponseRedirects('http://localhost/admin/login');
        }
        foreach ([['/admin/pages', ['title' => 'Geschmuggelt', 'slug' => 'geschmuggelt']], ['/admin/pages/p1/delete', ['expectedVersion' => 2]], ['/admin/menus/header', ['name' => 'X', 'expectedVersion' => 0]], ['/admin/api/style-presets', ['name' => 'X']]] as [$url, $body]) {
            $client->request('POST', $url, $body);
            self::assertResponseRedirects('http://localhost/admin/login');
        }
        self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page'));
    }

    public function testCreatingAPageNeedsACsrfTokenAndStartsAsAPrivateDraft(): void
    {
        $client = $this->login('editor');
        $client->request('POST', '/admin/pages', ['title' => 'Ohne Token', 'slug' => 'ohne-token', '_csrf_token' => 'wrong']);
        self::assertResponseRedirects('/admin');
        self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page'));

        $crawler = $client->request('GET', '/admin');
        $client->submit($crawler->filter('.create-form')->form(['title' => 'Über uns', 'slug' => '', 'type' => 'page', 'parent_id' => '']));
        self::assertResponseRedirects();
        // The address is derived from the title when the field is left empty.
        self::assertSame('ueber-uns', $this->db->fetchOne('SELECT path FROM page WHERE slug <> ?', ['home']));
        // A new page is a draft, so it must not answer publicly yet.
        $client->request('GET', '/ueber-uns');
        self::assertResponseStatusCodeSame(404);
    }

    public function testEditorsAreNeitherOfferedNorAllowedToDelete(): void
    {
        $client = $this->login('editor');
        $crawler = $client->request('GET', '/admin');
        self::assertCount(0, $crawler->filter('.delete-panel'), 'An editor must not be offered the delete action.');
        $client->request('POST', '/admin/pages/p1/delete', ['_csrf_token' => $crawler->filter('input[name="_csrf_token"]')->last()->attr('value'), 'expectedVersion' => 2]);
        self::assertResponseStatusCodeSame(403);
        self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page'));
    }

    public function testAdministratorsDeleteAPageWithAllRevisionsOnlyWithACsrfToken(): void
    {
        $client = $this->login('admin');
        $client->request('POST', '/admin/pages/p1/delete', ['_csrf_token' => 'wrong', 'expectedVersion' => 2]);
        self::assertResponseRedirects('/admin');
        self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page'));

        $crawler = $client->request('GET', '/admin');
        $client->submit($crawler->filter('.delete-panel form')->form());
        self::assertResponseRedirects('/admin');
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page'));
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision'));
        $client->request('GET', '/');
        self::assertResponseStatusCodeSame(404);
    }

    public function testMenuFormBuildsATreeFromFlatRowsAndReplacesTheFixedNavigation(): void
    {
        $client = $this->login('editor');
        $crawler = $client->request('GET', '/admin/menus');
        self::assertResponseIsSuccessful();

        // Rows are ordered by position and nested by level, so the form needs no JavaScript.
        $client->request('POST', '/admin/menus/header', [
            '_csrf_token' => $crawler->filter('.menu-form input[name="_csrf_token"]')->first()->attr('value'),
            'name' => 'Hauptnavigation',
            'expectedVersion' => 0,
            'items' => [
                ['position' => 30, 'level' => 1, 'label' => 'Extern', 'type' => 'url', 'url' => 'https://hausklar.app'],
                ['position' => 10, 'level' => 1, 'label' => 'Start', 'type' => 'page', 'pageId' => 'p1', 'anchor' => ''],
                ['position' => 20, 'level' => 2, 'label' => 'Kontakt', 'type' => 'page', 'pageId' => 'p1', 'anchor' => '#kontakt'],
                ['position' => 40, 'level' => 1, 'label' => '   ', 'type' => 'page', 'pageId' => 'p1'],
            ],
        ]);
        self::assertResponseRedirects('/admin/menus');

        $items = json_decode($this->db->fetchOne('SELECT items FROM menu WHERE slot = ?', ['header']), true);
        self::assertSame(['Start', 'Extern'], array_column($items, 'label'));
        self::assertSame('Kontakt', $items[0]['children'][0]['label']);
        // A leading hash in the anchor field is accepted and normalised away.
        self::assertSame('kontakt', $items[0]['children'][0]['anchor']);
        // The blank row is an add slot, not an entry.
        self::assertCount(2, $items);

        $public = $client->request('GET', '/')->filter('nav[aria-label="Hauptnavigation"] a');
        // The navigation comes from the menu now, not from the links hard-coded in the template.
        self::assertSame(['/', '/#kontakt', 'https://hausklar.app'], $public->extract(['href']));
    }

    public function testMenuWritesNeedAnEditorRoleACsrfTokenAndTheCurrentVersion(): void
    {
        $menus = new MenuRepository($this->db, new SiteSettings($this->db));
        $menus->save('header', 'Hauptnavigation', [['label' => 'Start', 'type' => 'page', 'pageId' => 'p1', 'anchor' => '', 'children' => []]], 0);

        $client = $this->login('editor');
        $crawler = $client->request('GET', '/admin/menus');
        $token = $crawler->filter('.menu-form input[name="_csrf_token"]')->first()->attr('value');
        $entry = ['position' => 10, 'level' => 1, 'label' => 'Geaendert', 'type' => 'page', 'pageId' => 'p1', 'anchor' => ''];

        $client->request('POST', '/admin/menus/header', ['_csrf_token' => 'wrong', 'name' => 'X', 'expectedVersion' => 1, 'items' => [$entry]]);
        self::assertResponseRedirects('/admin/menus');
        self::assertSame('Hauptnavigation', $this->db->fetchOne('SELECT name FROM menu WHERE slot = ?', ['header']));

        // A stale version must not overwrite a newer menu.
        $client->request('POST', '/admin/menus/header', ['_csrf_token' => $token, 'name' => 'Veraltet', 'expectedVersion' => 0, 'items' => [$entry]]);
        self::assertResponseRedirects('/admin/menus');
        self::assertSame('Hauptnavigation', $this->db->fetchOne('SELECT name FROM menu WHERE slot = ?', ['header']));

        // An unsafe target is refused with a message instead of being stored.
        $client->request('POST', '/admin/menus/header', ['_csrf_token' => $token, 'name' => 'Neu', 'expectedVersion' => 1, 'items' => [['position' => 10, 'level' => 1, 'label' => 'Boese', 'type' => 'url', 'url' => 'javascript:alert(1)']]]);
        $client->followRedirect();
        self::assertSelectorExists('.notice.error');
        self::assertStringNotContainsString('javascript:', $this->db->fetchOne('SELECT items FROM menu WHERE slot = ?', ['header']));

        $client->request('POST', '/admin/menus/header', ['_csrf_token' => $token, 'name' => 'Neu', 'expectedVersion' => 1, 'items' => [$entry]]);
        self::assertSame('Neu', $this->db->fetchOne('SELECT name FROM menu WHERE slot = ?', ['header']));
    }

    private function contactForm(): FormRepository
    {
        $forms = new FormRepository($this->db);
        $forms->save('kontakt', 'Kontakt', [
            ['name' => 'name', 'type' => 'text', 'label' => 'Name', 'required' => true],
            ['name' => 'email', 'type' => 'email', 'label' => 'E-Mail', 'required' => true],
            ['name' => 'thema', 'type' => 'select', 'label' => 'Thema', 'required' => true, 'options' => ['Beratung', 'Support']],
            ['name' => 'nachricht', 'type' => 'textarea', 'label' => 'Nachricht', 'required' => false],
            ['name' => 'datenschutz', 'type' => 'consent', 'label' => 'Ich willige ein.'],
        ], ['recipient' => 'info@kant-it.de', 'subject' => 'Anfrage', 'replyToField' => 'email', 'success' => 'Danke.'], 0);

        return $forms;
    }

    /** Publishes a page carrying the contact form block and returns the page path. */
    private function pageWithForm(): string
    {
        $document = DemoContent::starter('Kontakt');
        $document['schemaVersion'] = 8;
        $document['blocks'][] = ['id' => 'formblock', 'type' => 'form', 'props' => ['form' => 'kontakt']];
        $pages = new PageRepository($this->db, new DocumentValidator(), new SiteSettings($this->db));
        $revision = $pages->saveDraft('p1', $document, (int) $this->db->fetchOne('SELECT version FROM page WHERE id = ?', ['p1']));
        $pages->publish('p1', $revision, (int) $this->db->fetchOne('SELECT version FROM page WHERE id = ?', ['p1']));

        return 'home';
    }

    /** @return array<string, string> a body that would pass every check */
    private function validBody(string $issued): array
    {
        return [
            'page' => 'home', 'block' => 'formblock', 'website' => '',
            'issued' => $issued, 'issuedSignature' => hash_hmac('sha256', $issued, 'isolated-test-secret'),
            'name' => 'Umut', 'email' => 'umut@example.com', 'thema' => 'Beratung',
            'nachricht' => 'Bitte um Rückruf.', 'datenschutz' => 'ja',
        ];
    }

    public function testFormRendersWithoutScriptAndStoresAValidSubmissionWithConsent(): void
    {
        $this->contactForm();
        $this->pageWithForm();
        $client = self::createClient();

        $html = $client->request('GET', '/')->html();
        self::assertStringContainsString('action="/formular/kontakt"', $html);
        self::assertStringContainsString('Ich willige ein.', $html);
        // The honeypot exists but is kept out of the tab order and away from assistive technology.
        self::assertStringContainsString('name="website"', $html);
        self::assertStringContainsString('tabindex="-1"', $html);
        self::assertStringNotContainsString('<script', $client->getResponse()->getContent());

        $issued = (string) (time() - 10);
        $client->request('POST', '/formular/kontakt', $this->validBody($issued));
        // Post/Redirect/Get, so reloading the result page sends nothing twice.
        self::assertResponseStatusCodeSame(303);
        self::assertStringContainsString('?gesendet=kontakt#formblock', (string) $client->getResponse()->headers->get('Location'));

        $row = $this->db->fetchAssociative('SELECT * FROM form_submission');
        self::assertNotFalse($row);
        $data = json_decode($row['data'], true);
        self::assertSame('Umut', $data['name']);
        self::assertSame('ja', $data['datenschutz']);
        // The moment of consent is stored, the sender address never is.
        self::assertNotNull($row['consent_at']);
        self::assertSame(64, strlen($row['sender_hash']));
        self::assertStringNotContainsString('127.0.0.1', json_encode($row));

        // The success message appears on the page the form sits on.
        $client->request('GET', '/?gesendet=kontakt');
        self::assertStringContainsString('Danke.', $client->getResponse()->getContent());
    }

    public function testInvalidSubmissionKeepsEveryEntryAndNamesTheOffendingFields(): void
    {
        $this->contactForm();
        $this->pageWithForm();
        $client = self::createClient();

        $issued = (string) (time() - 10);
        $body = [...$this->validBody($issued), 'email' => 'keine-adresse', 'thema' => 'Erfunden', 'name' => '', 'datenschutz' => ''];
        $crawler = $client->request('POST', '/formular/kontakt', $body);
        self::assertResponseStatusCodeSame(422);
        // Nothing is stored and nothing is sent while anything is wrong.
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM form_submission'));

        $html = $client->getResponse()->getContent();
        self::assertStringContainsString('Bitte gib eine gültige E-Mail-Adresse an.', $html);
        self::assertStringContainsString('Bitte wähle eine der angebotenen Optionen.', $html);
        self::assertStringContainsString('Dieses Feld wird benötigt.', $html);
        self::assertStringContainsString('Ohne diese Einwilligung', $html);
        // Each message belongs to its field and is announced as such.
        self::assertSame('formblock-email-error', $crawler->filter('#formblock-email')->attr('aria-describedby'));
        self::assertSame('true', $crawler->filter('#formblock-email')->attr('aria-invalid'));
        self::assertCount(1, $crawler->filter('[role=alert]'));
        // The entries survive the rejection.
        self::assertSame('keine-adresse', $crawler->filter('#formblock-email')->attr('value'));
        self::assertStringContainsString('Bitte um Rückruf.', $crawler->filter('#formblock-nachricht')->text());
    }

    /**
     * @return iterable<string, array{callable(string): array}>
     */
    public static function droppedSubmissions(): iterable
    {
        $sign = static fn (string $issued): string => hash_hmac('sha256', $issued, 'isolated-test-secret');
        yield 'honeypot filled' => [static fn (array $body): array => [...$body, 'website' => 'https://spam.example']];
        yield 'submitted too fast' => [static fn (array $body): array => [...$body, 'issued' => (string) time(), 'issuedSignature' => $sign((string) time())]];
        yield 'timestamp forged' => [static fn (array $body): array => [...$body, 'issuedSignature' => 'nicht-signiert']];
        yield 'timestamp far in the past' => [static function (array $body) use ($sign): array {
            $old = (string) (time() - 200000);

            return [...$body, 'issued' => $old, 'issuedSignature' => $sign($old)];
        }];
    }

    #[DataProvider('droppedSubmissions')]
    public function testSpamProtectionDropsSubmissionsQuietlyWithoutStoringThem(callable $tamper): void
    {
        $this->contactForm();
        $this->pageWithForm();
        $client = self::createClient();

        $client->request('POST', '/formular/kontakt', $tamper($this->validBody((string) (time() - 10))));
        // Answered like a success so an automated sender learns nothing from the response.
        self::assertResponseStatusCodeSame(303);
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM form_submission'));
    }

    public function testRateLimitStopsTheSixthSubmissionWithinAnHour(): void
    {
        $forms = $this->contactForm();
        $this->pageWithForm();
        $client = self::createClient();

        for ($i = 0; $i < FormRepository::RATE_LIMIT; ++$i) {
            $client->request('POST', '/formular/kontakt', $this->validBody((string) (time() - 10)));
            self::assertResponseStatusCodeSame(303);
        }
        self::assertSame(FormRepository::RATE_LIMIT, (int) $this->db->fetchOne('SELECT COUNT(*) FROM form_submission'));

        $client->request('POST', '/formular/kontakt', $this->validBody((string) (time() - 10)));
        self::assertResponseStatusCodeSame(303);
        self::assertSame(FormRepository::RATE_LIMIT, (int) $this->db->fetchOne('SELECT COUNT(*) FROM form_submission'));
        self::assertTrue($forms->rateLimited(hash_hmac('sha256', '127.0.0.1', 'isolated-test-secret')));
    }

    public function testFormAdministrationNeedsAnEditorRoleAndACsrfToken(): void
    {
        $client = $this->login('editor');
        $crawler = $client->request('GET', '/admin/forms');
        self::assertResponseIsSuccessful();
        $token = $crawler->filter('.form-def input[name="_csrf_token"]')->first()->attr('value');
        $field = ['fields' => [['name' => 'email', 'type' => 'email', 'label' => 'E-Mail', 'required' => '1']]];

        $client->request('POST', '/admin/forms/neu', [...$field, '_csrf_token' => 'wrong', 'slug' => 'kontakt', 'name' => 'Kontakt', 'recipient' => 'info@kant-it.de', 'expectedVersion' => 0]);
        self::assertResponseRedirects('/admin/forms');
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM form'));

        // A recipient that is not an address is refused with a message rather than stored.
        $client->request('POST', '/admin/forms/neu', [...$field, '_csrf_token' => $token, 'slug' => 'kontakt', 'name' => 'Kontakt', 'recipient' => 'kein-empfaenger', 'expectedVersion' => 0]);
        $client->followRedirect();
        self::assertSelectorExists('.notice.error');
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM form'));

        $client->request('POST', '/admin/forms/neu', [...$field, '_csrf_token' => $token, 'slug' => 'kontakt', 'name' => 'Kontakt', 'recipient' => 'info@kant-it.de', 'expectedVersion' => 0]);
        self::assertSame('Kontakt', $this->db->fetchOne('SELECT name FROM form'));
    }

    public function testStylePresetsNeedAnEditorRoleACsrfTokenAndAValidStyle(): void
    {
        $client = $this->login('editor');
        $client->request('GET', '/admin/api/design');
        self::assertResponseIsSuccessful();
        $design = json_decode($client->getResponse()->getContent(), true);
        // The editor receives the vocabulary, the palette and the presets from one place.
        self::assertArrayHasKey('fontSize', $design['properties']);
        self::assertSame([], $design['presets']);
        $token = $design['csrfToken'];

        $post = function (array $body, string $csrf) use ($client): void {
            $client->request('POST', '/admin/api/style-presets', server: ['CONTENT_TYPE' => 'application/json', 'HTTP_X_CSRF_TOKEN' => $csrf], content: json_encode($body));
        };
        $post(['name' => 'Heller Abschnitt', 'style' => ['desktop' => ['fontSize' => '32px']]], 'wrong');
        self::assertResponseStatusCodeSame(403);

        // A style the documents would refuse cannot arrive through a preset either.
        $post(['name' => 'Boese', 'style' => ['desktop' => ['fontSize' => '32px;position:fixed']]], $token);
        self::assertResponseStatusCodeSame(422);
        $post(['name' => '   ', 'style' => ['desktop' => ['fontSize' => '32px']]], $token);
        self::assertResponseStatusCodeSame(422);
        self::assertStringNotContainsString('position:fixed', (string) $this->db->fetchOne('SELECT theme FROM website WHERE id = ?', ['default']));

        $post(['name' => 'Heller Abschnitt', 'style' => ['desktop' => ['fontSize' => '32px', 'padding' => ['top' => '40px']]]], $token);
        self::assertResponseIsSuccessful();
        $presets = json_decode($client->getResponse()->getContent(), true)['presets'];
        self::assertSame('heller-abschnitt', $presets[0]['key']);
        self::assertSame('32px', $presets[0]['style']['desktop']['fontSize']);

        // Removing works by sending the same name without a style.
        $post(['name' => 'Heller Abschnitt', 'style' => null], $token);
        self::assertSame([], json_decode($client->getResponse()->getContent(), true)['presets']);
    }

    public function testMediaUploadReencodingCsrfMetadataConflictAndArchive(): void
    {
        $client = $this->login('editor');
        $client->request('GET', '/admin/api/media');
        self::assertResponseIsSuccessful();
        $token = json_decode($client->getResponse()->getContent(), true)['csrfToken'];
        $client->request('POST', '/admin/api/media/upload');
        self::assertResponseStatusCodeSame(403);
        $path = tempnam(sys_get_temp_dir(), 'kant-image-');
        try {
            file_put_contents($path, '<svg xmlns="http://www.w3.org/2000/svg"><script>alert(1)</script></svg>');
            $client->request('POST', '/admin/api/media/upload', files: ['file' => new UploadedFile($path, 'fake.jpg', test: true)], server: ['HTTP_X_CSRF_TOKEN' => $token]);
            self::assertResponseStatusCodeSame(422);
            self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM media'));
            $image = imagecreatetruecolor(1800, 1000);
            imagepng($image, $path);
            imagedestroy($image);
            file_put_contents($path, '<?php SECRET_SOURCE_PAYLOAD ?>', FILE_APPEND);
            $client->request('POST', '/admin/api/media/upload', files: ['file' => new UploadedFile($path, 'example.php', test: true)], server: ['HTTP_X_CSRF_TOKEN' => $token]);
            self::assertResponseStatusCodeSame(201);
            $item = json_decode($client->getResponse()->getContent(), true)['item'];
            self::assertSame([480, 960, 1600], array_column($item['variants'], 'width'));
            foreach ($item['variants'] as $variant) {
                $file = $this->path.'-media/'.$item['id'].'-'.$variant['width'].'.webp';
                self::assertSame('image/webp', getimagesize($file)['mime']);
                self::assertStringNotContainsString('SECRET_SOURCE_PAYLOAD', file_get_contents($file));
            }
            $update = ['title' => 'Testbild', 'alt' => 'Dunkle Testfläche', 'version' => 1, 'archived' => true];
            $client->request('POST', '/admin/api/media/'.$item['id'], server: ['CONTENT_TYPE' => 'application/json', 'HTTP_X_CSRF_TOKEN' => $token], content: json_encode($update));
            self::assertResponseIsSuccessful();
            $client->request('POST', '/admin/api/media/'.$item['id'], server: ['CONTENT_TYPE' => 'application/json', 'HTTP_X_CSRF_TOKEN' => $token], content: json_encode($update));
            self::assertResponseStatusCodeSame(409);
            $client->request('GET', $item['variants'][0]['src']);
            self::assertResponseIsSuccessful();
            self::assertResponseHeaderSame('Content-Type', 'image/webp');
            self::assertResponseHeaderSame('X-Content-Type-Options', 'nosniff');
            $client->request('GET', '/media/'.$item['id'].'/999.webp');
            self::assertResponseStatusCodeSame(404);
            $update['version'] = 2;
            $update['archived'] = false;
            $client->request('POST', '/admin/api/media/'.$item['id'], server: ['CONTENT_TYPE' => 'application/json', 'HTTP_X_CSRF_TOKEN' => $token], content: json_encode($update));
            self::assertResponseIsSuccessful();
            self::assertSame(0, (int) $this->db->fetchOne('SELECT archived FROM media'));
        } finally {
            unlink($path);
        }
    }

    public function testTheMediaScreenUploadsAndEditsWithoutJavaScript(): void
    {
        $client = $this->login('editor');
        $crawler = $client->request('GET', '/admin/media');
        self::assertResponseIsSuccessful();
        // The images are on the page itself, not behind a button that opens a dialog.
        self::assertCount(0, $crawler->filter('.library-tile'));
        self::assertCount(1, $crawler->filter('form[action="/admin/media/upload"] input[type="file"]'));
        $token = $crawler->filter('form[action="/admin/media/upload"] input[name="_csrf_token"]')->attr('value');

        $path = tempnam(sys_get_temp_dir(), 'kant-form-image-');
        try {
            $image = imagecreatetruecolor(900, 600);
            imagepng($image, $path);
            imagedestroy($image);

            $client->request('POST', '/admin/media/upload', ['_csrf_token' => 'wrong'], ['files' => [new UploadedFile($path, 'ohne-token.png', test: true)]]);
            self::assertResponseRedirects('/admin/media');
            self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM media'));

            // Two files in one submit, the way the drop area collects them.
            $client->request('POST', '/admin/media/upload', ['_csrf_token' => $token], ['files' => [
                new UploadedFile($path, 'erstes.png', test: true),
                new UploadedFile($path, 'zweites.png', test: true),
            ]]);
            self::assertResponseRedirects('/admin/media');
            self::assertSame(2, (int) $this->db->fetchOne('SELECT COUNT(*) FROM media'));

            $crawler = $client->followRedirect();
            self::assertCount(2, $crawler->filter('.library-tile'));
            self::assertCount(1, $crawler->filter('.notice.ok'));
            self::assertStringContainsString('2 Bild(er) hochgeladen', $crawler->filter('.notice.ok')->text());

            $id = (string) $this->db->fetchOne('SELECT id FROM media LIMIT 1');
            $client->request('POST', '/admin/media/'.$id, ['_csrf_token' => $token, 'title' => 'Bergblick', 'alt' => 'Grüne Berglandschaft', 'archived' => '1', 'version' => 1]);
            self::assertResponseRedirects('/admin/media');
            self::assertSame(['Bergblick', 'Grüne Berglandschaft', 1], array_values($this->db->fetchNumeric('SELECT title, alt, archived FROM media WHERE id = ?', [$id])));

            // An archived image is out of the default listing but still delivered, and the archive
            // view shows it again.
            self::assertCount(1, $client->request('GET', '/admin/media')->filter('.library-tile'));
            self::assertCount(2, $client->request('GET', '/admin/media?archiv=1')->filter('.library-tile'));

            // A second save with the same version is refused instead of overwriting the newer one.
            $client->request('POST', '/admin/media/'.$id, ['_csrf_token' => $token, 'title' => 'Nochmal', 'alt' => '', 'version' => 1]);
            self::assertResponseRedirects('/admin/media');
            self::assertSame('Bergblick', $this->db->fetchOne('SELECT title FROM media WHERE id = ?', [$id]));
            self::assertCount(1, $client->followRedirect()->filter('.notice.error'));
        } finally {
            unlink($path);
        }
    }

    public function testTheMediaScreenPaginatesAndKeepsTheRequestedPageAfterASave(): void
    {
        $client = $this->login('editor');
        for ($number = 1; $number <= 26; ++$number) {
            $this->db->insert('media', [
                'id' => str_pad((string) $number, 32, '0', STR_PAD_LEFT),
                'title' => 'Bild '.$number,
                'alt' => '',
                'variants' => json_encode([['src' => '/media/x/480', 'width' => 480, 'height' => 320, 'bytes' => 1]]),
                'archived' => 0,
                'version' => 1,
                // Ascending dates, so "newest first" puts number 26 on the first page.
                'created_at' => gmdate('Y-m-d H:i:s', strtotime('2026-09-01 00:00:00') + $number * 60),
            ]);
        }
        $first = $client->request('GET', '/admin/media');
        self::assertCount(MediaLibrary::PER_PAGE, $first->filter('.library-tile'));
        self::assertStringContainsString('Bild 26', $first->filter('.library-tile')->first()->text());
        self::assertCount(1, $first->filter('.pager a[rel="next"]'));
        self::assertCount(0, $first->filter('.pager a[rel="prev"]'));

        $second = $client->request('GET', '/admin/media?seite=2');
        self::assertCount(2, $second->filter('.library-tile'));
        self::assertStringContainsString('Bild 2', $second->filter('.library-tile')->first()->text());
        // A page beyond the end is clamped instead of showing an empty screen.
        self::assertCount(2, $client->request('GET', '/admin/media?seite=99')->filter('.library-tile'));

        // Saving from page two comes back to page two.
        $token = $second->filter('form[action^="/admin/media/000"] input[name="_csrf_token"]')->first()->attr('value');
        $id = str_pad('2', 32, '0', STR_PAD_LEFT);
        $client->request('POST', '/admin/media/'.$id, ['_csrf_token' => $token, 'title' => 'Umbenannt', 'alt' => '', 'version' => 1, 'seite' => 2]);
        self::assertResponseRedirects('/admin/media?seite=2');
    }

    public function testTheMandatoryLegalPagesAreCreatedPublishedAndLinkedEverywhere(): void
    {
        $client = $this->login('editor');
        $crawler = $client->request('GET', '/admin/settings');
        // As long as they are missing, the settings screen says so instead of hiding it.
        self::assertCount(1, $crawler->filter('form[action="/admin/settings/rechtliches"]'));
        self::assertStringContainsString('Pflichtseiten fehlen', $crawler->filter('.card-head')->first()->text());
        $token = $crawler->filter('form[action="/admin/settings/rechtliches"] input[name="_csrf_token"]')->attr('value');

        $client->request('POST', '/admin/settings/rechtliches', ['_csrf_token' => 'wrong']);
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page WHERE path IN (?, ?)', ['datenschutz', 'impressum']));

        $client->request('POST', '/admin/settings/rechtliches', ['_csrf_token' => $token]);
        self::assertResponseRedirects('/admin/settings');

        // Both pages exist, are published, and the settings point at them.
        foreach (['datenschutz' => 'Datenschutzerklärung', 'impressum' => 'Impressum'] as $path => $title) {
            $row = $this->db->fetchAssociative('SELECT id, published_revision_id FROM page WHERE path = ?', [$path]);
            self::assertNotFalse($row, $path);
            self::assertNotNull($row['published_revision_id'], $path.' must be published: an unpublished imprint is no imprint.');
            $client->request('GET', '/'.$path);
            self::assertResponseIsSuccessful();
            self::assertStringContainsString($title, $client->getResponse()->getContent());
            // The skeleton says plainly that it is not finished.
            self::assertStringContainsString('NOCH AUSZUFÜLLEN', $client->getResponse()->getContent());
        }

        // And they are linked from an ordinary page, without anyone editing the footer.
        $client->request('GET', '/');
        $content = $client->getResponse()->getContent();
        self::assertStringContainsString('<a href="/datenschutz">Datenschutz</a>', $content);
        self::assertStringContainsString('<a href="/impressum">Impressum</a>', $content);

        // Running it twice keeps the existing pages: they may already carry the real text.
        $before = $this->db->fetchOne('SELECT COUNT(*) FROM revision');
        $client->request('POST', '/admin/settings/rechtliches', ['_csrf_token' => $token]);
        self::assertSame($before, $this->db->fetchOne('SELECT COUNT(*) FROM revision'));
        self::assertSame(2, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page WHERE path IN (?, ?)', ['datenschutz', 'impressum']));
    }

    public function testPasswordUpgradeRefreshesTheSessionUser(): void
    {
        $provider = new UserProvider($this->db);
        $user = $provider->loadUserByIdentifier('admin');
        $hash = password_hash('Fixture-only-password', PASSWORD_BCRYPT, ['cost' => 5]);
        $provider->upgradePassword($user, $hash);
        self::assertSame($hash, $user->getPassword());
        self::assertSame($hash, $provider->refreshUser($user)->getPassword());
    }

    public function testChangedRolesInvalidateAnExistingSession(): void
    {
        $client = $this->login();
        $this->db->executeStatement('UPDATE cms_user SET roles = ? WHERE username = ?', ['["ROLE_EDITOR"]', 'admin']);
        $client->request('GET', '/admin/api/pages/p1');
        self::assertResponseRedirects('http://localhost/admin/login');
    }

    public function testLoginCsrfAndPasswordAreRequired(): void
    {
        $client = self::createClient();
        $client->request('POST', '/admin/login', ['_username' => 'admin', '_password' => 'Fixture-only-password']);
        self::assertResponseRedirects('/admin/login');
        $crawler = $client->followRedirect();
        self::assertSelectorExists('[role="alert"]');
        $client->submit($crawler->selectButton('Anmelden')->form(['_username' => 'admin', '_password' => 'wrong']));
        self::assertResponseRedirects('/admin/login');
        $client->request('GET', '/admin');
        self::assertResponseRedirects('http://localhost/admin/login');
    }

    public function testCsrfProtectsEveryPostAndMalformedBodyIsRejected(): void
    {
        $client = $this->login();
        $data = $this->data($client);
        foreach (['draft', 'publish', 'preview'] as $action) {
            $this->post($client, $action, ['document' => $data['document'], 'expectedVersion' => $data['version'], 'revisionId' => $data['revisionId']], 'invalid');
            self::assertResponseStatusCodeSame(403);
        }
        $this->post($client, 'draft', ['document' => $data['document'], 'expectedVersion' => '2'], $data['csrfToken']);
        self::assertResponseStatusCodeSame(422);
        $client->request('POST', '/admin/api/pages/p1/draft', server: ['CONTENT_TYPE' => 'application/json', 'HTTP_X_CSRF_TOKEN' => $data['csrfToken']], content: '{bad-json');
        self::assertResponseStatusCodeSame(422);
        self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision'));
    }

    public function testEditorCanSaveButCannotPublish(): void
    {
        $client = $this->login('editor');
        $data = $this->data($client);
        $data['document']['title'] = 'Private draft';
        $this->post($client, 'draft', ['document' => $data['document'], 'expectedVersion' => 2], $data['csrfToken']);
        self::assertResponseIsSuccessful();
        $saved = json_decode($client->getResponse()->getContent(), true);
        $this->post($client, 'publish', ['expectedVersion' => 3, 'revisionId' => $saved['revisionId']], $data['csrfToken']);
        self::assertResponseStatusCodeSame(403);
        $client->request('GET', '/');
        self::assertStringNotContainsString('Private draft', $client->getResponse()->getContent());
    }

    public function testPreviewSaveConflictAndPublishRoundTrip(): void
    {
        $client = $this->login();
        $data = $this->data($client);
        $document = $data['document'];
        $document['blocks'][0]['children'][1]['props']['text'] = 'An edited heading';
        $this->post($client, 'preview', ['document' => $document], $data['csrfToken']);
        self::assertResponseIsSuccessful();
        self::assertStringContainsString('An edited heading', $client->getResponse()->getContent());
        self::assertStringContainsString('no-store', $client->getResponse()->headers->get('Cache-Control'));
        self::assertStringContainsString('noindex', $client->getResponse()->headers->get('X-Robots-Tag'));
        $this->post($client, 'draft', ['document' => $document, 'expectedVersion' => 2], $data['csrfToken']);
        self::assertResponseIsSuccessful();
        $saved = json_decode($client->getResponse()->getContent(), true);
        self::assertSame($document, $saved['document']);
        self::assertSame(3, $saved['version']);
        $this->post($client, 'draft', ['document' => $data['document'], 'expectedVersion' => 2], $data['csrfToken']);
        self::assertResponseStatusCodeSame(409);
        $this->post($client, 'publish', ['expectedVersion' => 3, 'revisionId' => $data['revisionId']], $data['csrfToken']);
        self::assertResponseStatusCodeSame(409);
        $this->post($client, 'publish', ['expectedVersion' => 3, 'revisionId' => $saved['revisionId']], $data['csrfToken']);
        self::assertResponseIsSuccessful();
        $client->request('GET', '/');
        self::assertStringContainsString('An edited heading', $client->getResponse()->getContent());
        self::assertStringNotContainsString('editor.js', $client->getResponse()->getContent());
        self::assertFalse($client->getResponse()->headers->has('Set-Cookie'));
    }

    public function testLogoutInvalidatesSessionAndNeedsCsrf(): void
    {
        $client = $this->login();
        $client->request('POST', '/admin/logout', ['_csrf_token' => 'wrong']);
        self::assertResponseStatusCodeSame(403);
        $crawler = $client->request('GET', '/admin');
        $client->submit($crawler->selectButton('Abmelden')->form());
        self::assertResponseRedirects('/admin/login');
        $client->request('GET', '/admin');
        self::assertResponseRedirects('http://localhost/admin/login');
    }
}