c# - how use Google OAuth2 using ServiceAccount in .net?

Question

Is there any sample how to access a google service API using service account in .net?

private const string SERVICE_ACCOUNT_EMAIL = "xxxxxxxxxxx@developer.gserviceaccount.com";
private const string SERVICE_ACCOUNT_PKCS12_FILE_PATH = @"pathest-privatekey.p12";

static DriveService BuildService() 
{
    X509Certificate2 certificate = new X509Certificate2(SERVICE_ACCOUNT_PKCS12_FILE_PATH, "notasecret",
    X509KeyStorageFlags.Exportable);

    var provider = new AssertionFlowClient(GoogleAuthenticationServer.Description, certificate)
    {
        ServiceAccountId = SERVICE_ACCOUNT_EMAIL,
        Scope = DriveService.Scopes.Drive.GetStringValue(),
    };
    var auth = new OAuth2Authenticator<AssertionFlowClient>(provider, AssertionFlowClient.GetState);

    return new DriveService((new BaseClientService.Initializer()
    {
        Authenticator = auth
    });
}

This isn't successful in returning a OAuth connection. How can this be done?

Answer 1

This case work in my site

var certificate = new X509Certificate2("pathTo***.p12", "notasecret", X509KeyStorageFlags.Exportable);
        var serviceAccountEmail = "********-*********@developer.gserviceaccount.com";
        var userAccountEmail = "******@gmail.com";
        ServiceAccountCredential credential = new ServiceAccountCredential(
                   new ServiceAccountCredential.Initializer(serviceAccountEmail)
                   {
                       Scopes = new[] { DriveService.Scope.Drive },
                       User = userAccountEmail

                   }.FromCertificate(certificate));

        // Create the service.
        var service = new DriveService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = "*****",
        });