WebMaster Tools API authentcation

WebMaster Tools API authentcation

/// <summary>
        /// Authenticate to Google Using Oauth2
        /// Documentation https://developers.google.com/accounts/docs/OAuth2
        /// </summary>
        /// <param name="clientId">From Google Developer console https://console.developers.google.com</param>
        /// <param name="clientSecret">From Google Developer console https://console.developers.google.com</param>
        /// <param name="userName">A string used to identify a user.</param>
        /// <returns></returns>
        public static WebmastersService  AuthenticateOauth(string clientId, string clientSecret, string userName)
        {
            
            string[] scopes = new string[] { WebmastersService.Scope.Webmasters};     // View analytics data

            try
            {
                // here is where we Request the user to give us access, or use the Refresh Token that was previously stored in %AppData%
                UserCredential credential = GoogleWebAuthorizationBroker.AuthorizeAsync(new ClientSecrets { ClientId = clientId, ClientSecret = clientSecret }
                                                                                             , scopes
                                                                                             , userName
                                                                                             , CancellationToken.None
                                                                                             , new FileDataStore("Daimto.GoogleWebMasters.Auth.Store")).Result;

                WebmastersService service = new WebmastersService(new BaseClientService.Initializer()
                {
                    HttpClientInitializer = credential,
                    ApplicationName = "WebMasters API Sample",
                });
                return service;
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex.InnerException);
                return null;

            }

        }

        /// <summary>
        /// Authenticating to Google using a Service account
        /// Documentation: https://developers.google.com/accounts/docs/OAuth2#serviceaccount
        /// </summary>
        /// <param name="serviceAccountEmail">From Google Developer console https://console.developers.google.com</param>
        /// <param name="keyFilePath">Location of the Service account key file downloaded from Google Developer console https://console.developers.google.com</param>
        /// <returns></returns>
        public static WebmastersService AuthenticateServiceAccount(string serviceAccountEmail, string keyFilePath)
        {

            // check the file exists
            if (!File.Exists(keyFilePath))
            {
                Console.WriteLine("An Error occurred - Key file does not exist");
                return null;    
            }

            string[] scopes = new string[] { WebmastersService.Scope.Webmasters};     // View WebMasters data            

            var certificate = new X509Certificate2(keyFilePath, "notasecret", X509KeyStorageFlags.Exportable);
            try
            {
                ServiceAccountCredential credential = new ServiceAccountCredential(
                    new ServiceAccountCredential.Initializer(serviceAccountEmail)
                   {
                       Scopes = scopes
                   }.FromCertificate(certificate));

                // Create the service.
                WebmastersService service = new WebmastersService(new BaseClientService.Initializer()
                {
                    HttpClientInitializer = credential,
                    ApplicationName = "WebMasters API Sample",
                });
                return service;
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex.InnerException);
                return null;

            }
        }



    }