worker: cleanup previous cache versions

1 files changed, 14 insertions, 1 deletions

diff --git a/worker.js b/worker.js
index 7b1d424..983dc25 100644
--- a/worker.js
+++ b/worker.js
@@ -1,6 +1,7 @@
 //importScripts('lib/localforage.min.js');
 
-const CACHE_NAME = 'epube-v2';
+const CACHE_PREFIX = 'epube';
+const CACHE_NAME = CACHE_PREFIX + '-v2';
 const CACHE_URLS = [
 			'read.html',
 			'js/common.js',
@@ -41,6 +42,18 @@ self.addEventListener('install', function(event) {
   );
 });
 
+self.addEventListener('activate', function(event) {
+	event.waitUntil(
+		caches.keys().then(function(keyList) {
+			return Promise.all(keyList.map(function(key) {
+				if (key.indexOf(CACHE_PREFIX) != -1 && key != CACHE_NAME) {
+					return caches.delete(key);
+				}
+	      }));
+	    })
+    );
+});
+
 function send_message(client, msg) {
 	client.postMessage(msg);
 }