c# – 如何为GoogleWebAuthorizationBroker.AuthorizeAsync设置return_uri？

我试图在我的非MVC .NET Web应用程序中使用 Google Calendar API. (这似乎是一个重要的区别.)

我试图使用Google的this example和Daimto的this example的代码,以及一些related posts here的一些有用的提示.

我写了以下方法：

public void GetUserCredential( String userName )
{
    String clientId = ConfigurationManager.AppSettings[ "Google.ClientId" ];            //From Google Developer console https://console.developers.google.com
    String clientSecret = ConfigurationManager.AppSettings[ "Google.ClientSecret" ];    //From Google Developer console https://console.developers.google.com
    String[] scopes = new string[] {
            Google.Apis.Calendar.v3.CalendarService.Scope.Calendar          
    };

    // 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( "c:\\temp" ) ).Result;

    // Todo: Replace FileDataStore with DatabaseDataStore
}

问题是,当Google的OAuth2页面被调用时,redirect_uri将继续设置为http：// localhost：< some-random-port> / authorize.我不知道如何将其设置为其他内容,如AuthorizeAsync生成的以下示例URL所示：

https://accounts.google.com/o/oauth2/auth?access_type=offline
    &response_type=code
    &client_id=********.apps.googleusercontent.com
    &redirect_uri=http:%2F%2Flocalhost:40839%2Fauthorize%2F
    &scope=https:%2F%2Fwww.googleapis.com%2Fauth%2Fcalendar

Google会通过一个redirect_uri_mismatch错误页面回复一条消息：

“请求中的重定向URI：http://localhost:XXXXX/authorize/与注册的重定向URI不匹配”

我只能在我的Google开发人员控制台凭证页面中注册这么多重定向URI.我不想注册65535个端口,我想在我的网站上使用除/授权之外的页面.具体来说,在开发过程中,我想使用http：// localhost：888 / Pages / GoogleApiRedirect,但是不知道我在哪里设置这个,除了我在开发者控制台中所做的一切.

如何显式设置redirect_uri的值？我也以“这种做法完全错误”的形式开放回应.

编辑：

在过去一天玩过之后,我发现通过使用本机应用程序的客户端ID /客户端密钥而不是Web应用程序,我至少可以访问Google的Web授权页面,而不会抱怨redirect_uri_mismatch.这仍然是不可接受的,因为它仍然返回到http：// localhost：< some-random-port> / authorize,这在我的Web应用程序的控制之外.

解决方法

你可以使用这段代码：(原始想法从 http://coderissues.com/questions/27512300/how-to-append-login-hint-usergmail-com-to-googlewebauthorizationbroker)

dsAuthorizationbroker.RedirectUri = "my localhost redirect uri";
UserCredential credential = await dsAuthorizationbroker.AuthorizeAsync(...

dsAuthorizationbroker.cs

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Auth.OAuth2.Flows;
using Google.Apis.Auth.OAuth2.Requests;
using Google.Apis.Util.Store;

namespace OAuth2
{    
    public class dsAuthorizationbroker : GoogleWebAuthorizationbroker
    {
        public static string RedirectUri;

        public new static async Task<UserCredential> AuthorizeAsync(
            ClientSecrets clientSecrets,IEnumerable<string> scopes,string user,CancellationToken taskCancellationToken,IDataStore dataStore = null)
        {
            var initializer = new GoogleAuthorizationCodeFlow.Initializer
            {
                ClientSecrets = clientSecrets,};
            return await AuthorizeAsyncCore(initializer,user,taskCancellationToken,dataStore).ConfigureAwait(false);
        }

        private static async Task<UserCredential> AuthorizeAsyncCore(
            GoogleAuthorizationCodeFlow.Initializer initializer,IDataStore dataStore)
        {
            initializer.Scopes = scopes;
            initializer.DataStore = dataStore ?? new FileDataStore(Folder);
            var flow = new dsAuthorizationCodeFlow(initializer);
            return await new AuthorizationCodeInstalledApp(flow,new LocalServerCodeReceiver())
                .AuthorizeAsync(user,taskCancellationToken).ConfigureAwait(false);
        }
    }


    public class dsAuthorizationCodeFlow : GoogleAuthorizationCodeFlow
    {
        public dsAuthorizationCodeFlow(Initializer initializer)
            : base(initializer) { }

        public override AuthorizationCodeRequestUrl
                       CreateAuthorizationCodeRequest(string redirectUri)
        {
            return base.CreateAuthorizationCodeRequest(dsAuthorizationbroker.RedirectUri);
        }
    }    
}