當麻許的超技八

{
  "web": {
    "client_id": "1088926593294-4shj9oeum763j5fd5qnlkir6evntdocs.apps.googleusercontent.com",
    "project_id": "donma-test",
    "auth_uri": "https://accounts.google.com/o/oauth2/auth",
    "token_uri": "https://accounts.google.com/o/oauth2/token",
    "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
    "client_secret": "53YoSqiEdipRA2bp-nbFTOpW",
    "redirect_uris": [ "http://localhost:60435/user_regist.aspx" ]
  }
}

        protected void btnStart_Click(object sender, EventArgs e)
        {

            GoogleClientSecrets clientSecret;
            //匯入專案憑證
            using (var stream = new FileStream(Gfolder + @"\client_secret.json", FileMode.Open, FileAccess.Read))
            {
                clientSecret = GoogleClientSecrets.Load(stream);
            }

            //建立流程權限
            IAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow(
            new GoogleAuthorizationCodeFlow.Initializer
            {

                ClientSecrets = clientSecret.Secrets,
                DataStore = new FileDataStore(Gfolder),
                Scopes = new[] { CalendarService.Scope.Calendar }
            });

            
            var uri = System.Web.HttpContext.Current.Request.Url.ToString();
            var result = new AuthorizationCodeWebApp(flow, uri, "success").AuthorizeAsync(UserId, CancellationToken.None).Result;
            if (result.RedirectUri != null)
            {
                //導去授權頁
                Response.Redirect(result.RedirectUri);
            }

        }

        /// <summary>
        /// App 憑證資料的檔案夾
        /// </summary>
        public static string Gfolder = AppDomain.CurrentDomain.BaseDirectory + "GoogleStorage" + System.IO.Path.DirectorySeparatorChar;

        /// <summary>
        /// 通常在就是用戶的資料庫 id 
        /// </summary>
        public static string UserId = "sample_user_id";


        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GoogleClientSecrets clientSecret;

                using (var stream = new FileStream(Gfolder + @"\client_secret.json", FileMode.Open, FileAccess.Read))
                {
                    clientSecret = GoogleClientSecrets.Load(stream);
                }

                IAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow(
                                                new GoogleAuthorizationCodeFlow.Initializer
                                                {
                                                    ClientSecrets = clientSecret.Secrets,
                                                    DataStore = new FileDataStore(Gfolder),
                                                    Scopes = new[] { CalendarService.Scope.Calendar }
                                                });

                var uri =HttpContext.Current.Request.Url.ToString();
                var code =HttpContext.Current.Request["code"];
                if (code != null)
                {
                    var token = flow.ExchangeCodeForTokenAsync(UserId, code,
                                   uri.Substring(0, uri.IndexOf("?")), CancellationToken.None).Result;
                    
                    //儲存使用者的Token
                    var oauthState = AuthWebUtility.ExtracRedirectFromState(
                        flow.DataStore, UserId, Request["state"]).Result;

                    //印出儲存狀態
                    Response.Write(oauthState);
                }

            }
        }