OAuth with Ionic and ngCordova - Trakt.tv API

gistfile1.js

        /*
        * Sign into the Trakt service
        *
        * @param    string clientId
        * @param    string clientSecret
        * @return   promise
        */
        trakt: function(clientId, clientSecret) {
            var deferred = $q.defer();
            if(window.cordova) {
                var cordovaMetadata = cordova.require("cordova/plugin_list").metadata;
                if(cordovaMetadata.hasOwnProperty("org.apache.cordova.inappbrowser") === true) {
                    var browserRef = window.open("https://trakt.tv/oauth/authorize?client_id=" + clientId + "&redirect_uri=urn:ietf:wg:oauth:2.0:oob&response_type=code", "_blank", "location=no,clearsessioncache=yes,clearcache=yes");
                    browserRef.addEventListener("loadstart", function(event) {
                        console.log(event.url);                      
                        if((event.url).indexOf("http://trakt.tv/oauth/authorize/") === 0) {
                            var requestToken = (event.url).split("authorize/")[1];
                            console.log('requestToken:'+requestToken);
                            $http.defaults.headers.post['Content-Type'] = 'application/json';
                            $http({method: "post", url: "http://api.trakt.tv/oauth/token", data: "client_id=" + clientId + "&client_secret=" + clientSecret + "&redirect_uri=urn:ietf:wg:oauth:2.0:oob" + "&grant_type=authorization_code" + "&code=" + requestToken })
                            .success(function(data) {
                                deferred.resolve(data);
                            })
                            .error(function(data, status, headers, config, statusText) {
                                deferred.reject("Problem authenticating");
                            })
                            .finally(function() {
                                setTimeout(function() {
                                    browserRef.close();
                                }, 10);
                            });
                        }
                    });
                    browserRef.addEventListener('exit', function(event) {
                        deferred.reject("The sign in flow was canceled");
                    });
                } else {
                    deferred.reject("Could not find InAppBrowser plugin");
                }
            } else {
                deferred.reject("Cannot authenticate via a web browser");
            }
            return deferred.promise;
        },