poll new revision date instead of full sync each time

src/background.js

@@ -618,10 +618,11 @@ setInterval(fullSync, 5 * 60 * 1000); // check every 5 minutes
 var syncInternal = 6 * 60 * 60 * 1000; // 6 hours
 
 function fullSync(override) {
+    override = override || false;
     syncService.getLastSync(function (lastSync) {
         var now = new Date();
         if (override || !lastSync || (now - lastSync) >= syncInternal) {
-            syncService.fullSync(function () { });
+            syncService.fullSync(override, function () { });
         }
     });
 }

src/popup/app/settings/settingsSyncController.js

@@ -9,7 +9,7 @@
 
         $scope.sync = function () {
             $scope.loading = true;
-            syncService.fullSync(function () {
+            syncService.fullSync(true, function () {
                 $analytics.eventTrack('Synced Full');
                 $scope.loading = false;
                 toastr.success(i18nService.syncingComplete);

src/services/apiService.js

@@ -46,6 +46,23 @@ function initApiService() {
 
     // Account APIs
 
+    ApiService.prototype.getAccountRevisionDate = function (success, error) {
+        var self = this;
+        this.tokenService.getToken(function (token) {
+            $.ajax({
+                type: 'GET',
+                url: self.baseUrl + '/accounts/revision-date?access_token=' + token,
+                dataType: 'json',
+                success: function (response) {
+                    success(response);
+                },
+                error: function (jqXHR, textStatus, errorThrown) {
+                    handleError(error, jqXHR, textStatus, errorThrown);
+                }
+            });
+        });
+    };
+
     ApiService.prototype.getProfile = function (success, error) {
         var self = this;
         this.tokenService.getToken(function (token) {

src/services/syncService.js

@@ -10,7 +10,7 @@
 };
 
 function initSyncService() {
-    SyncService.prototype.fullSync = function (callback) {
+    SyncService.prototype.fullSync = function (forceSync, callback) {
         if (!callback || typeof callback !== 'function') {
             throw 'callback function required';
         }
@@ -27,24 +27,56 @@ function initSyncService() {
 
             self.userService.getUserId(function (userId) {
                 var now = new Date();
+                needsSyncing(self, forceSync, function (needsSync) {
+                    if (!needsSync) {
+                        self.syncCompleted(false);
+                        callback(false);
+                        return;
+                    }
 
-                var promises = [];
-                promises.push(syncVault(userId));
-                promises.push(syncSettings(userId));
+                    var promises = [];
+                    promises.push(syncVault(userId));
+                    promises.push(syncSettings(userId));
 
-                Q.all(promises).then(function () {
-                    self.setLastSync(now, function () {
-                        self.syncCompleted(true);
-                        callback(true);
+                    Q.all(promises).then(function () {
+                        self.setLastSync(now, function () {
+                            self.syncCompleted(true);
+                            callback(true);
+                        });
+                    }, function () {
+                        self.syncCompleted(false);
+                        callback(false);
                     });
-                }, function () {
-                    self.syncCompleted(false);
-                    callback(false);
                 });
             });
         });
     };
 
+    function needsSyncing(self, forceSync, callback) {
+        if (!callback || typeof callback !== 'function') {
+            throw 'callback function required';
+        }
+
+        if (forceSync) {
+            callback(true);
+            return;
+        }
+
+        self.getLastSync(function (lastSync) {
+            var now = new Date();
+
+            self.apiService.getAccountRevisionDate(function (response) {
+                var accountRevisionDate = new Date(response);
+                if (accountRevisionDate <= lastSync) {
+                    callback(false);
+                    return;
+                }
+
+                callback(true);
+            });
+        });
+    }
+
     function syncVault(userId) {
         var deferred = Q.defer();
         var self = this;