feat: add preview provider for emf files

Signed-off-by: Daniel Kesselberg <[email protected]>

lib/AppInfo/Application.php

@@ -37,6 +37,7 @@
 use OCA\Richdocuments\Listener\ShareLinkListener;
 use OCA\Richdocuments\Middleware\WOPIMiddleware;
 use OCA\Richdocuments\PermissionManager;
+use OCA\Richdocuments\Preview\EMF;
 use OCA\Richdocuments\Preview\MSExcel;
 use OCA\Richdocuments\Preview\MSWord;
 use OCA\Richdocuments\Preview\OOXML;
@@ -88,6 +89,7 @@ public function register(IRegistrationContext $context): void {
 			'getPathForToken',
 			'getWopiForToken',
 		]);
+		$context->registerPreviewProvider(EMF::class, '/image\/emf/');
 	}
 
 	public function boot(IBootContext $context): void {

lib/Preview/EMF.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2023 Daniel Kesselberg <[email protected]>
+ *
+ * @author Daniel Kesselberg <[email protected]>
+ *
+ * @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 EMF extends Office {
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getMimeType() {
+		return '/image\/emf/';
+	}
+}