Question

我正在尝试创建桌面应用程序，该应用程序允许列出Google云端硬盘帐户中的文件和文件夹。在这个问题上，我能够做到，但有一个问题。每次我想从我的应用程序打开谷歌驱动器帐户时，我必须重新登录。是否可以使用存储的本地AccessToken / Refresh令牌以避免每次重新授权？

此处用于获取授权的方法。

private IAuthorizationState GetAuthorization(NativeApplicationClient arg)
    {

        IAuthorizationState state = new AuthorizationState(new[] { "https://www.googleapis.com/auth/drive.file", "https://www.googleapis.com/auth/drive", "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile" });

        // Get the auth URL:   
        state.Callback = new Uri("urn:ietf:wg:oauth:2.0:oob");
        UriBuilder builder = new UriBuilder(arg.RequestUserAuthorization(state));
        NameValueCollection queryParameters = HttpUtility.ParseQueryString(builder.Query);

        queryParameters.Set("access_type", "offline");
        queryParameters.Set("approval_prompt", "force");
        queryParameters.Set("user_id", email);

        builder.Query = queryParameters.ToString();
        //Dialog window wich returns authcode
        GoogleWebBrowserAuthenticator a = new GooogleWebBrowserAuthenticator(builder.Uri.ToString());
        a.ShowDialog();
        //Request authorization from the user (by opening a browser window):
        string authCode = a.authCode;

        // Retrieve the access token by using the authorization code:
        return arg.ProcessUserAuthorization(authCode, state);
    }

解决：

要首先从Google云端硬盘sdk调用方法，您需要服务实例：

        var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description, GoogleDriveHelper.CLIENT_ID, GoogleDriveHelper.CLIENT_SECRET);
        var auth = new OAuth2Authenticator<NativeApplicationClient>(provider, GetAuthorization);
        Service = new DriveService(auth);

您在Google API控制台中注册申请后将拥有的CLIENT_ID和CLIENT_SECRET。

然后，您需要定义GetAuthorization例程，该例程可能如下所示：

private IAuthorizationState GetAuthorization(NativeApplicationClient arg)
    {
        IAuthorizationState state = new AuthorizationState(new[] { "https://www.googleapis.com/auth/drive.file", "https://www.googleapis.com/auth/drive", "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile" });
        state.Callback = new Uri("urn:ietf:wg:oauth:2.0:oob");

        state.RefreshToken = AccountInfo.RefreshToken;
        state.AccessToken = AccountInfo.AccessToken;
        arg.RefreshToken(state);

        return state;
    }

如果您已经拥有刷新和访问令牌（至少刷新），它将起作用。因此，您需要先为某些用户帐户进行授权。

然后您可以使用该Service实例来调用sdk方法。希望它会帮助别人。

使用存储的凭据进行授权。适用于.NET的Google Drive API

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