1 files changed, 21 insertions, 0 deletions
diff --git a/apps/files/src/services/PreviewService.ts b/apps/files/src/services/PreviewService.ts
new file mode 100644
index 00000000000..6dbb67f30b6
--- /dev/null
+++ b/apps/files/src/services/PreviewService.ts
@@ -0,0 +1,21 @@
+/**
+ * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+// The preview service worker cache name (see webpack config)
+const SWCacheName = 'previews'
+
+/**
+ * Check if the preview is already cached by the service worker
+ * @param previewUrl URL to check
+ */
+export async function isCachedPreview(previewUrl: string): Promise<boolean> {
+	if (!window?.caches?.open) {
+		return false
+	}
+
+	const cache = await window.caches.open(SWCacheName)
+	const response = await cache.match(previewUrl)
+	return response !== undefined
+}