c# - Google 云端硬盘服务帐户刷新 token

Question

我的 session 每小时过期一次，并且在我使用服务帐户身份验证方法时找不到有关如何刷新 token 的文档。对于已安装的应用程序，我能够从 state 对象中获取 RefreshToken

AuthorizationState state = new AuthorizationState(new[]
{
    "https://www.googleapis.com/auth/drive",
    "https://www.googleapis.com/auth/drive.file",
    "https://www.googleapis.com/auth/drive.metadata.readonly",
    "https://www.googleapis.com/auth/drive.readonly"
})
{
    Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl)
}
state = client.ProcessUserAuthorization(GetAuthorizationCode(), state);
Console.WriteLine(state.RefreshToken);

但是如何为服务帐户执行此操作？

X509Certificate2 certificate = new X509Certificate2(SERVICE_ACCOUNT_PKCS12_FILE_PATH, "mysecret", X509KeyStorageFlags.Exportable);

var provider = new AssertionFlowClient(GoogleAuthenticationServer.Description, certificate)
{
    ServiceAccountId = SERVICE_ACCOUNT_EMAIL,
    Scope = DriveService.Scopes.Drive.GetStringValue(),
    ServiceAccountUser = "myemail@mydomain.com",
};

var auth = new OAuth2Authenticator<AssertionFlowClient>(provider, AssertionFlowClient.GetState);
DriveService service = DriveService(auth);

从 Google SDK 源代码中，我发现 AssertionFlowClient.GetState 函数执行以下操作

    IAuthorizationState state = new AuthorizationState(provider.Scope.Split(' '));

    if (provider.RefreshToken(state, null)) {
        return state;
    } else {
        return null;
    }

看起来它确实刷新了 token 。我将此函数调用添加到我的 token 刷新计时器，但没有帮助。一小时后，我仍然继续收到 Invalid credentials 异常。

Answer 1

服务帐户不使用刷新 token 。您只需使用您第一次使用的相同过程请求另一个访问 token 。请参阅 Google 的文档以了解如何操作 when access tokens expire .