Upload PDFs to the library, link them from any link target, show them in a viewer

PDFs go through the same upload field as images, are checked by their content and kept
unchanged in their own table. Every link field can pick one, and a page that links a PDF
opens it in a dialog with the browser's own viewer; touch devices and browsers without a
viewer get a new tab instead.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/EditorSecurityTest.php

@@ -738,6 +738,47 @@ final class EditorSecurityTest extends WebTestCase
         }
     }
 
+    public function testPdfsGoThroughTheMediaUploadAndTheEditorPicker(): void
+    {
+        $client = $this->login('editor');
+        $crawler = $client->request('GET', '/admin/media');
+        $token = $crawler->filter('form[action="/admin/media/upload"] input[name="_csrf_token"]')->attr('value');
+        $path = tempnam(sys_get_temp_dir(), 'kant-form-pdf-');
+        try {
+            file_put_contents($path, "%PDF-1.7\n%%EOF\n");
+            // Dasselbe Feld wie für Bilder: der Inhalt entscheidet, wohin die Datei geht.
+            $client->request('POST', '/admin/media/upload', ['_csrf_token' => $token], ['files' => [new UploadedFile($path, 'Flyer.pdf', test: true)]]);
+            self::assertResponseRedirects('/admin/media');
+            self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM media'));
+            self::assertSame('Flyer', $this->db->fetchOne('SELECT title FROM document'));
+            $crawler = $client->followRedirect();
+            self::assertStringContainsString('1 Datei(en) hochgeladen', $crawler->filter('.notice.ok')->text());
+            self::assertCount(1, $crawler->filter('section[aria-labelledby="documents-heading"] .row'));
+
+            // Die Auswahl im Editor: Liste mit Token, Hochladen nur mit Token.
+            $client->request('GET', '/admin/api/dokumente');
+            self::assertResponseIsSuccessful();
+            $data = json_decode($client->getResponse()->getContent(), true);
+            self::assertSame('Flyer', $data['items'][0]['title']);
+            $client->request('POST', '/admin/api/dokumente/upload', files: ['file' => new UploadedFile($path, 'zweites.pdf', test: true)]);
+            self::assertResponseStatusCodeSame(403);
+            file_put_contents($path, '<?php echo 1;');
+            $client->request('POST', '/admin/api/dokumente/upload', files: ['file' => new UploadedFile($path, 'getarnt.pdf', test: true)], server: ['HTTP_X_CSRF_TOKEN' => $data['csrfToken']]);
+            self::assertResponseStatusCodeSame(422);
+            self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM document'));
+
+            // Archivieren nimmt es aus der Auswahl-Übersicht, die Datei bleibt erreichbar.
+            $id = $data['items'][0]['id'];
+            $client->request('POST', '/admin/api/dokumente/'.$id, server: ['CONTENT_TYPE' => 'application/json', 'HTTP_X_CSRF_TOKEN' => $data['csrfToken']], content: json_encode(['title' => 'Flyer 2026', 'archived' => true, 'version' => 1]));
+            self::assertResponseIsSuccessful();
+            self::assertCount(0, $client->request('GET', '/admin/media')->filter('section[aria-labelledby="documents-heading"] .row'));
+            $client->request('GET', '/media/'.$id.'.pdf');
+            self::assertResponseIsSuccessful();
+        } finally {
+            unlink($path);
+        }
+    }
+
     public function testMediaPreviewReadsSmallAndArchivedImagesWithoutListingTheLibrary(): void
     {
         $id = str_repeat('a', 32);
@@ -785,7 +826,7 @@ final class EditorSecurityTest extends WebTestCase
             $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());
+            self::assertStringContainsString('2 Datei(en) 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]);