Use collabora for PDF previews

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/AppInfo/Application.php

@@ -30,6 +30,7 @@
 use OCA\Richdocuments\Preview\MSWord;
 use OCA\Richdocuments\Preview\OOXML;
 use OCA\Richdocuments\Preview\OpenDocument;
+use OCA\Richdocuments\Preview\Pdf;
 use OCP\AppFramework\App;
 use OCP\IPreview;
 
@@ -75,5 +76,9 @@ public function registerProvider() {
 			return $container->query(OpenDocument::class);
 		});
 
+		$previewManager->registerProvider('/application\/pdf/', function() use ($container) {
+			return $container->query(Pdf::class);
+		});
+
 	}
 }

lib/Preview/Pdf.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * @copyright Copyright (c) 2019 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+namespace OCA\Richdocuments\Preview;
+
+class Pdf extends Office {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType() {
+		return '/application\/pdf/';
+	}
+}