cleanup event listeners for u2f

src/popup/app/accounts/accountsLoginTwoFactorController.js

@@ -7,16 +7,19 @@
         utilsService.initListSectionItemListeners($(document), angular);
 
         var u2f = new U2f(function (data) {
+            $timeout(function () {
                 $scope.login(data);
-            $scope.$apply();
+            });
         }, function (error) {
+            $timeout(function () {
                 toastr.error(error, i18nService.errorsOccurred);
-            $scope.$apply();
+            });
         }, function (info) {
+            $timeout(function () {
                 if (info === 'ready') {
                     $scope.u2fReady = true;
                 }
-            $scope.$apply();
+            });
         });
 
         var constants = constantsService;
@@ -62,7 +65,6 @@
             $scope.loginPromise.then(function () {
                 $analytics.eventTrack('Logged In From Two-step');
                 $state.go('tabs.vault', { animation: 'in-slide-left', syncOnLoad: true });
-                u2f = null;
             }, function () {
                 u2f.start();
             });
@@ -87,8 +89,6 @@
         };
 
         $scope.anotherMethod = function () {
-            u2f.stop();
-            u2f = null;
             $state.go('twoFactorMethods', {
                 animation: 'in-slide-up',
                 email: email,
@@ -99,13 +99,17 @@
         };
 
         $scope.back = function () {
-            u2f.stop();
-            u2f = null;
             $state.go('login', {
                 animation: 'out-slide-right'
             });
         };
 
+        $scope.$on('$destroy', function () {
+            u2f.stop();
+            u2f.cleanup();
+            u2f = null;
+        });
+
         function getDefaultProvider(twoFactorProviders) {
             var keys = Object.keys(twoFactorProviders);
             var providerType = null;
@@ -127,6 +131,7 @@
 
         function init() {
             u2f.stop();
+            u2f.cleanup();
 
             $timeout(function () {
                 $('#code').focus();

src/scripts/u2f.js

@@ -6,8 +6,11 @@
     this.connectorLink = document.createElement('a');
 }
 
+(function () {
+    var thisU2f = null;
+
     U2f.prototype.init = function (data) {
-    var self = this;
+        var self = thisU2f = this;
 
         self.connectorLink.href = 'https://vault.bitwarden.com/u2f-connector.html' +
             '?data=' + this.base64Encode(JSON.stringify(data)) +
@@ -17,25 +20,7 @@ U2f.prototype.init = function (data) {
         self.iframe = document.getElementById('u2f_iframe');
         self.iframe.src = self.connectorLink.href;
 
-    window.addEventListener('message', function (event) {
+        window.addEventListener('message', parseMessage, false);
-        if (!self.validMessage(event)) {
-            self.error('Invalid message.');
-            return;
-        }
-
-        var parts = event.data.split('|');
-        if (parts[0] === 'success' && self.success) {
-            self.success(parts[1]);
-        }
-        else if (parts[0] === 'error' && self.error) {
-            self.error(parts[1]);
-        }
-        else if (parts[0] === 'info') {
-            if (self.info) {
-                self.info(parts[1]);
-            }
-        }
-    }, false);
     };
 
     U2f.prototype.validMessage = function (event) {
@@ -68,3 +53,32 @@ U2f.prototype.base64Encode = function (str) {
             return String.fromCharCode('0x' + p1);
         }));
     };
+
+    U2f.prototype.cleanup = function () {
+        window.removeEventListener('message', parseMessage, false);
+    };
+
+    function parseMessage(event) {
+        if (!thisU2f) {
+            return;
+        }
+
+        if (!thisU2f.validMessage(event)) {
+            thisU2f.error('Invalid message.');
+            return;
+        }
+
+        var parts = event.data.split('|');
+        if (parts[0] === 'success' && thisU2f.success) {
+            thisU2f.success(parts[1]);
+        }
+        else if (parts[0] === 'error' && thisU2f.error) {
+            thisU2f.error(parts[1]);
+        }
+        else if (parts[0] === 'info') {
+            if (thisU2f.info) {
+                thisU2f.info(parts[1]);
+            }
+        }
+    };
+})();