/// <summary>
/// Facebook on authentication completed callback handler
/// </summary>
/// <param name="sender">sender of the event</param>
/// <param name="e">authentication copmpleted event args</param>
protected override async void OnAuthenticationCompletedCallback(object sender, AuthenticatorCompletedEventArgs e)
{
var response = new AuthenticatedUserResponseEventArgs(false);
if (e.IsAuthenticated)
{
try
{
// inspect access token and verify permissions were granted
var accessToken = e.Account.Properties["access_token"];
// store access token for session management
HttpClient client = new HttpClient();
var userProfileReponse = await client.GetStringAsync(UserInfoUrl.Format(accessToken));
var userProfile = JsonConvert.DeserializeObject <FacebookProfile>(userProfileReponse);
response.IsAuthenticated = true;
response.UserId = userProfile.Id;
response.Email = userProfile.Email;
response.Name = userProfile.Name;
response.ProfileImage = new Xamarin.Forms.Image()
{
Source = new Uri(userProfile.Picture.Data.Url)
};
}
catch (Exception)
{
response.IsAuthenticated = false;
}
}
NotifyOnCompletedEvent(response);
}
/// <summary>
/// Notifies the on completed event.
/// </summary>
/// <param name="authenticatedUserResponse">The <see cref="AuthenticatedUserResponseEventArgs"/> instance containing the event data.</param>
protected void NotifyOnCompletedEvent(AuthenticatedUserResponseEventArgs authenticatedUserResponse)
{
_authenticator.Completed -= OnAuthenticationCompletedCallback;
OnAuthenticationCompleted?.Invoke(this, authenticatedUserResponse);
}