// Facebook Authentification
void FacebookAuthentication()
{
flag = false;
// If was send true to Profile.EnableUpdatesOnAccessTokenChange method
// this notification will be called after the user is logged in and
// after the AccessToken is gotten
Profile.Notifications.ObserveDidChange((sender, e) =>
{
if (e.NewProfile == null)
{
return;
}
var accessToken = AccessToken.CurrentAccessToken.TokenString;
var request = new GraphRequest("/" + e.NewProfile.UserID, new NSDictionary("fields", "email,first_name,last_name,picture.type(large)"), accessToken, null, "GET");
request.Start((connection, result, error) =>
{
// Show the loading overlay on the UI
LoadingOverlay.ShowOverlay(View);
var userInfo = result as NSDictionary;
// Get Facebook avatar image from url
var avatarUrl = new NSUrl(userInfo["picture"].ValueForKey(new NSString("data")).ValueForKey(new NSString("url")).ToString());
var data = NSData.FromUrl(avatarUrl);
facebookImageData = data;
// string facebookAvatar = data.GetBase64EncodedString(NSDataBase64EncodingOptions.None);
// facebookAvatar = new NSString(eefacebookAvatar, NSStringEncoding.UTF8); //Encoding.ASCII.GetString(ToByteArray(data));
// Add Facebook user to database
var user = new UsersModel()
{
FirstName = userInfo["first_name"].ToString(),
LastName = userInfo["last_name"].ToString(),
Email = userInfo["email"].ToString().ToLower(),
LoginProvider = "Facebook"
};
// Call REST service to send Json data
RestService rs = new RestService();
// Get Json data from server in JsonResponseModel format
Task <UsersModel> jsonResponeTask = rs.UserLoginAndRegisterJson(user, "register");
// If there was an error in PostJsonDataAsync class, display message
if (jsonResponeTask == null)
{
LoadingOverlay.RemoveOverlay();
return;
}
// Get user id from Json after login or display an error
GetUserIdFromJson(jsonResponeTask, user);
if (error != null)
{
LoadingOverlay.RemoveOverlay();
Console.WriteLine("Error in request. Start Facebook login");
return;
}
});
});
// Set the Read and Publish permissions you want to get
loginView = new LoginButton(fbAuthButton.Frame)
{
LoginBehavior = LoginBehavior.Native,
ReadPermissions = readPermissions.ToArray()
};
// Handle actions once the user is logged in
loginView.Completed += LoginView_Completed;
// Handle actions once the user is logged out
loginView.LoggedOut += (sender, e) =>
{
// Set logout User Defaults
var plist = NSUserDefaults.StandardUserDefaults;
plist.SetBool(false, "isUserLoggedIn"); // set flag that user logged out
plist.SetString("", "userId");
plist.Synchronize();
};
// Use your System Account of Settings
//loginButton.LoginBehavior = LoginBehavior.SystemAccount;
// Add views to main view
View.AddSubview(loginView);
}