perf(files): fetch previews faster and cache properly

Signed-off-by: John Molakvoæ <skjnldsv@protonmail.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/apps/files/src/services/ServiceWorker.js b/apps/files/src/services/ServiceWorker.js
new file mode 100644
index 00000000000..223c0681323
--- /dev/null
+++ b/apps/files/src/services/ServiceWorker.js
@@ -0,0 +1,40 @@
+/**
+ * @copyright Copyright (c) 2019 Gary Kim <gary@garykim.dev>
+ *
+ * @author Gary Kim <gary@garykim.dev>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * 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/>.
+ *
+ */
+import { generateUrl } from '@nextcloud/router'
+import logger from '../logger.js'
+
+export default () => {
+	if ('serviceWorker' in navigator) {
+		// Use the window load event to keep the page load performant
+		window.addEventListener('load', async () => {
+			try {
+				const url = generateUrl('/apps/files/preview-service-worker.js', {}, { noRewrite: true })
+				const registration = await navigator.serviceWorker.register(url, { scope: '/' })
+				logger.debug('SW registered: ', { registration })
+			} catch (error) {
+				logger.error('SW registration failed: ', { error })
+			}
+		})
+	} else {
+		logger.debug('Service Worker is not enabled on this browser.')
+	}
+}