/// <summary>
/// Asynchronously checks the authentication.
/// </summary>
protected override async Task <SerializableAPIResult <SerializableAPICredentials> > CheckAuthenticationAsync()
{
if (m_result == null)
{
m_result = new SerializableAPIResult <SerializableAPICredentials>();
}
try
{
if (!HasCredentialsStored)
{
return(m_result);
}
if (s_credential == null)
{
await GetCredentialsAsync().ConfigureAwait(false);
}
using (DriveService client = GetClient())
{
AboutResource.GetRequest request = client.About.Get();
request.Fields = "user";
await request.ExecuteAsync().ConfigureAwait(false);
}
}
catch (GoogleApiException exc)
{
m_result.Error = new SerializableAPIError {
ErrorMessage = exc.Error.Message
};
}
catch (TokenResponseException exc)
{
m_result.Error = new SerializableAPIError {
ErrorMessage = exc.Error.ErrorDescription ?? exc.Error.Error
};
if (HasCredentialsStored)
{
await ResetSettingsAsync().ConfigureAwait(false);
}
}
catch (Exception exc)
{
m_result.Error = new SerializableAPIError {
ErrorMessage = exc.Message
};
}
return(m_result);
}
static AutoResetEvent AuthCompletedHandle; // перед запуском аутентификации нужно = new AutoResetEvent(false);
// Параметры аутентификации платформ-специфичны. Поэтому перед началом работы нужно вызвать этот метод в проекте конкретной платформы.
public static void InitAuthParameters(string clientId, string redirectUrl, string appName, Action actionToStartAuth)
{
// Сохраним эти переменные на случай, если нужно будет перелогиниться, т.е. создать новый Auth, т.е. снова вызвать InitAuthParameters().
authActionToStart = actionToStartAuth;
authClientId = clientId;
authRedirectUrl = redirectUrl;
authAppName = appName;
Auth = new OAuth2Authenticator(
clientId,
string.Empty,
"https://www.googleapis.com/auth/drive",
new Uri("https://accounts.google.com/o/oauth2/auth"),
new Uri(redirectUrl),
new Uri("https://accounts.google.com/o/oauth2/token"),
isUsingNativeUI: true);
Auth.Completed += async(sender, e) =>
{
//Debug.WriteLine("EVENT Auth.Completed()");
AuthenticatorCompletedEventArgs args = e as AuthenticatorCompletedEventArgs;
if (args.IsAuthenticated)
{
GoogleAuthorizationCodeFlow googleFlow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer()
{
ClientSecrets = new ClientSecrets()
{
ClientId = clientId,
ClientSecret = string.Empty,
},
Scopes = new string[] { "https://www.googleapis.com/auth/drive" }
});
var token = new TokenResponse {
AccessToken = args.Account.Properties["access_token"], RefreshToken = args.Account.Properties["refresh_token"]
};
var credential = new UserCredential(googleFlow, "user", token);
Service = new DriveService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = authAppName,
});
//Получим справочную информацию об аккаунте:
AboutResource.GetRequest aboutReq = Service.About.Get();
aboutReq.Fields = "user";
About about = await aboutReq.ExecuteAsync();
User user = about.User;
UserName = user.DisplayName;
UserEmail = user.EmailAddress;
}
else
{
DependencyService.Get <IToast>().ShortToast("Google Drive authentication canceled.");
}
AuthCompletedHandle.Set();
};
Auth.Error += (sender, e) =>
{
//Debug.WriteLine("EVENT Auth.Error ");
AuthenticatorErrorEventArgs err = e as AuthenticatorErrorEventArgs;
DependencyService.Get <IToast>().ShortToast("GD Auth: " + err.Message + ". " + err.Exception?.ToString());
AuthCompletedHandle.Set();
};
}
