fido u2f login flow

src/app/accounts/accountsLoginController.js

@@ -2,7 +2,7 @@ angular
     .module('bit.accounts')
 
     .controller('accountsLoginController', function ($scope, $rootScope, $cookies, apiService, cryptoService, authService,
-        $state, constants, $analytics, $uibModal, $timeout) {
+        $state, constants, $analytics, $uibModal, $timeout, $window) {
         $scope.state = $state;
 
         var returnState;
@@ -118,5 +118,21 @@ angular
                     }
                 });
             }
+            else if ($scope.twoFactorProvider === constants.twoFactorProvider.u2f) {
+                var params = $scope.twoFactorProviders[constants.twoFactorProvider.u2f];
+                var challenges = JSON.parse(params.Challenges);
+                if (challenges.length < 1) {
+                    return;
+                }
+
+                $window.u2f.sign(challenges[0].appId, challenges[0].challenge, [{
+                    version: challenges[0].version,
+                    keyHandle: challenges[0].keyHandle
+                }], function (data) {
+                    console.log('call back data:');
+                    console.log(data);
+                    $scope.twoFactor(JSON.stringify(data));
+                });
+            }
         }
     });

src/app/accounts/views/accountsLoginTwoFactor.html

@@ -84,3 +84,28 @@
         </div>
     </form>
 </div>
+
+<div ng-if="twoFactorProvider === 4">
+    <p class="login-box-msg">
+        Complete logging in with U2F.
+    </p>
+    <form name="twoFactorForm" ng-submit="twoFactorForm.$valid && twoFactor(token)" api-form="twoFactorPromise">
+        <div class="callout callout-danger validation-errors" ng-show="twoFactorForm.$errors">
+            <h4>Errors have occurred</h4>
+            <ul>
+                <li ng-repeat="e in twoFactorForm.$errors">{{e}}</li>
+            </ul>
+        </div>
+        <p>Press the button on your security key to continue.</p>
+        <div class="row">
+            <div class="col-xs-7">
+                <a stop-click href="#" ng-click="anotherMethod()">Use another method?</a>
+            </div>
+            <div class="col-xs-5">
+                <button type="submit" class="btn btn-primary btn-block btn-flat" ng-disabled="twoFactorForm.$loading">
+                    <i class="fa fa-refresh fa-spin loading-icon" ng-show="twoFactorForm.$loading"></i>Log In
+                </button>
+            </div>
+        </div>
+    </form>
+</div>