rik · February 16, 2015 21:30 · Feb 16, 2015
diff --git a/gistfile1.js b/gistfile1.js
@@ -0,0 +1,40 @@
+  ensure_endpoint: function() {
+    if (!navigator.push) {
+      // Do nothing when push notifications are not supported
+      console.log('no support for push notifications');
+      return Promise.resolve();
+    }
+
+    if (ensure_endpoint_in_progress) {
+      return Promise.resolve();
+    }
+    ensure_endpoint_in_progress = true;
+
+    function ensure_endpoint_done() {
+      ensure_endpoint_in_progress = false;
+    }
+
+    return asyncStorage.getItem(ENDPOINT_ID_KEY).then(function(endpoint) {
+      if (endpoint) {
+        return Promise.resolve();
+      }
+
+      var defer = Utils.defer();
+      var req = navigator.push.register();
+      req.onsuccess = function() {
+        defer.resolve(req.result);
+      };
+      req.onerror = function() {
+        defer.reject();
+      };
+
+      return defer.promise.then(function(endpoint_url) {
+        var set_promise = asyncStorage.setItem(ENDPOINT_ID_KEY, endpoint_url);
+        return Promise.all([endpoint_url, set_promise]);
+      }).then(function(endpoint_url) {
+        return SumoDB.register_push_endpoint(endpoint_url);
+      }).catch(function() {
+        return asyncStorage.removeItem(ENDPOINT_ID_KEY);
+      });
+    }).then(ensure_endpoint_done, ensure_endpoint_done);
+  },