如何在.NET中使用刷新标记通过谷歌驱动器SDK来生成访问令牌？ [英] How to generate access token using refresh token through Google Drive SDK in .NET?

问题描述

我有一个使用谷歌驱动器来访问用户的文件.NET应用程序。我能够获得授权，code，我已经能够通过AccessToken和RefreshToken交换授权code。问题是，我不能刷新访问令牌，并在一个小时后到期。

与此类似的问题：<一href="http://stackoverflow.com/questions/10631042/how-to-generate-access-token-using-refresh-token-through-google-drive-api">How通过谷歌驱动的API使用刷新标记生成访问令牌？的不同之处在于，我在.NET中工作（使用Google.APIs ...... DLL文件）。

我很清楚这一点：<一href="https://developers.google.com/accounts/docs/OAuth2InstalledApp#refresh">https://developers.google.com/accounts/docs/OAuth2InstalledApp#refresh但是，我期待某种形式的IAuthorizationState或OAuth2Authenticator对象提供的方法，让我刷新访问令牌。

请指教。谢谢。

请注意，使用这个code，我能够获得访问令牌。这只是我期待这个code是谷歌API里面。

 公共类OAuth2AccessTokenReponse
    {
        公共字符串access_token;
        公众诠释expires_in;
        公共字符串token_type;
    }
    公共静态字符串refreshAccessToken（）
    {
        使用（System.Net.WebClient客户端=新System.Net.WebClient（））
        {
            byte []的响应= client.UploadValues​​（https://accounts.google.com/o/oauth2/token，新System.Collections.Specialized.NameValueCollection（）{
                {CLIENT_ID，客户端ID}，
                {client_secret，ClientSecret}，
                {refresh_token，XXXXX}，
                {grant_type，refresh_token}
            }）;
            串sresponse = System.Text.Encoding.Default.GetString（响应）;
            OAuth2AccessTokenReponse O =（OAuth2AccessTokenReponse）Newtonsoft.Json.JsonConvert.DeserializeObject（sresponse的typeof（OAuth2AccessTokenReponse））;
            返回o.access_token;
        }
    }
 

解决方案

我学的是一个更合适的样品：在GoogleApisSample的Tasks.WinForms.NoteMgr ......并用它，我找到了解决办法。

解决的方法是在低于code。它的关键部分是调用的 arg.RefreshToken（状态）; 的

感谢。

 公共静态Authentication.IAuthenticator UseSavedAuthorization（）
    {

        VAR提供商=新NativeApplicationClient（GoogleAuthenticationServer.Description）;
        provider.ClientIdentifier =客户端ID;
        provider.ClientSecret = ClientSecret;

        OAuth2Authenticator＆LT; NativeApplicationClient＆GT; AUTH =新OAuth2Authenticator＆LT; NativeApplicationClient＆GT;（供应商的getState）;

        auth.LoadAccessToken（）;

        返回身份验证;
    }


公共静态IAuthorizationState的getState（NativeApplicationClient ARG）
    {
        IAuthorizationState状态=新AuthorizationState（新[] {TasksService.Scopes.Tasks.GetStringValue（）
                DriveService.Scopes.DriveFile.GetStringValue（），DriveService.Scopes.Drive.GetStringValue（）
        }）;
        state.Callback =新的URI（NativeApplicationClient.OutOfBandCallbackUrl）;

        state.RefreshToken =＆LT;刷新令牌previously保存＆gt;中;
        arg.RefreshToken（州）;

        返回的状态;
    }`
 

I have a .NET application that is using Google Drive to access the user's file. I am able to get the authorization code, and I have been able to exchange the authorization code by the AccessToken and the RefreshToken. The issue is that I cannot refresh the access token, and it expires after an hour.

Similar to this question: How to generate access token using refresh token through google drive API? except that I am working in .NET (using the Google.APIs... DLLs).

I am aware of this: https://developers.google.com/accounts/docs/OAuth2InstalledApp#refresh however, I am expecting some sort of method available in the IAuthorizationState or OAuth2Authenticator object to allow me refresh the access token.

Please advise. Thanks.

Please note that using this code I am able to get the Access Token. It is just that I am expecting this code to be inside the Google API.

    public class OAuth2AccessTokenReponse
    {
        public string access_token;
        public int expires_in;
        public string token_type; 
    }
    public static string refreshAccessToken()
    {
        using (System.Net.WebClient client = new System.Net.WebClient())
        {
            byte[] response = client.UploadValues("https://accounts.google.com/o/oauth2/token", new System.Collections.Specialized.NameValueCollection(){
                {"client_id", ClientID},
                {"client_secret", ClientSecret},
                {"refresh_token", "XXXXX"},
                {"grant_type", "refresh_token"}
            });
            string sresponse = System.Text.Encoding.Default.GetString(response);
            OAuth2AccessTokenReponse o = (OAuth2AccessTokenReponse) Newtonsoft.Json.JsonConvert.DeserializeObject(sresponse, typeof(OAuth2AccessTokenReponse));
            return o.access_token;        
        }
    }

解决方案

I studied a more suitable sample: the Tasks.WinForms.NoteMgr of the GoogleApisSample... and with it I found the solution.

The solution is in the code below. The key part of it is calling arg.RefreshToken(state);

Thanks.

    public static Authentication.IAuthenticator UseSavedAuthorization()
    {          

        var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description);
        provider.ClientIdentifier = ClientID;
        provider.ClientSecret = ClientSecret;

        OAuth2Authenticator<NativeApplicationClient> auth = new OAuth2Authenticator<NativeApplicationClient>(provider, getState);

        auth.LoadAccessToken();

        return auth;             
    }


public static IAuthorizationState getState(NativeApplicationClient arg)
    {
        IAuthorizationState state = new AuthorizationState(new[] { TasksService.Scopes.Tasks.GetStringValue(), 
                DriveService.Scopes.DriveFile.GetStringValue() , DriveService.Scopes.Drive.GetStringValue()
        });
        state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);

        state.RefreshToken = "<refresh token previously saved>";        
        arg.RefreshToken(state); 

        return state; 
    }`

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