private async Task AuthenticateAsync()
{
var initializer = new Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.Initializer(AUTH_ENDPOINT, TOKEN_ENDPOINT)
{
ClientSecrets = new Google.Apis.Auth.OAuth2.ClientSecrets {
ClientId = CLIENT_ID, ClientSecret = CLIENT_SECRET
},
};
var authorizer = new Google.Apis.Auth.OAuth2.AuthorizationCodeInstalledApp(
new Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow(initializer),
new Google.Apis.Auth.OAuth2.LocalServerCodeReceiver(String.Format(Globalization.Strings.Localize("LABEL_CLOSE_AUTH_WINDOW")), Google.Apis.Auth.OAuth2.LocalServerCodeReceiver.CallbackUriChooserStrategy.ForceLocalhost));
var result = await authorizer.AuthorizeAsync(string.Empty, System.Threading.CancellationToken.None);
_accessToken = result.Token.AccessToken;
}
public async Task InitializeAsync()
{
var initializer = new Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.Initializer(_authServerUrl, _tokenServerUrl);
initializer.ClientSecrets = new ClientSecrets()
{
ClientId = "<CLIENTID>",
ClientSecret = "<CLIENTSECRET>"
};
initializer.Scopes = Scopes;
initializer.DataStore = new StorageDataStore();
var flow = new AuthorizationCodeFlow(initializer);
// try to load access token response from storage
TokenResponse tokenResponse = null;
try
{
tokenResponse = await flow.LoadTokenAsync(_userId, CancellationToken.None);
}
catch (Exception)
{
}
// if access token response is not found, exchange device code for access token
if (tokenResponse == null)
{
TokenRequest tokenRequest = new DeviceCodeTokenRequest()
{
ClientId = initializer.ClientSecrets.ClientId,
ClientSecret = initializer.ClientSecrets.ClientSecret,
Code = _deviceCode,
Scope = Scopes[0]
};
tokenResponse = await flow.FetchTokenAsync(_userId, tokenRequest, CancellationToken.None);
await flow.DataStore.StoreAsync(_userId, tokenResponse);
}
UserCredential credential = new UserCredential(flow, _userId, tokenResponse);
service = new CalendarService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = AppName,
});
}
