public async Task <IFacebookAccount> AuthenticateAsync(IFacebookAuthOptions options)
{
await LogoutAsync();
var currentAccessToken = global::Facebook.CoreKit.AccessToken.CurrentAccessToken;
if (currentAccessToken != null &&
(currentAccessToken.ExpirationDate == null || ((DateTime)currentAccessToken.ExpirationDate).ToUniversalTime() > DateTime.UtcNow))
{
var currentProfile = global::Facebook.CoreKit.Profile.CurrentProfile;
if (currentProfile != null)
{
populateAccount(currentAccessToken, currentProfile, options.RequestedPhotoSize);
}
}
var loginManager = new global::Facebook.LoginKit.LoginManager();
var vc = global::Plugin.SocialAuth.iOS.SocialAuth.PresentingViewController;
global::Facebook.LoginKit.LoginManagerLoginResult resp = null;
var scopes = options?.Scopes ?? new string[] { };
if (options?.WritePermissions ?? false)
{
resp = await loginManager.LogInWithPublishPermissionsAsync(scopes, vc);
}
else
{
resp = await loginManager.LogInWithReadPermissionsAsync(scopes, vc);
}
if (resp.IsCancelled)
{
return(null);
}
if (resp == null || resp.Token == null)
{
return(null);
}
return(populateAccount(resp.Token, global::Facebook.CoreKit.Profile.CurrentProfile, options.RequestedPhotoSize));
}
static async void RequestTokenHandler(SDK.LoginKit.LoginManagerLoginResult result, NSError error)
{
if (error != null)
{
Log.For(typeof(Facebook)).Error("An error occurred in Facebook :[" + error + "]");
await OnError.Raise(error.ToString());
}
else if (result?.IsCancelled ?? true)
{
await OnCancel.Raise();
}
else
{
try
{
var er = result.ToString();
var accessToken = result.Token;
if (accessToken.IsExpired)
{
accessToken = await RefreshAccessToken();
}
CurrentAccessToken = new AccessToken
{
TokenString = accessToken.TokenString,
AppId = accessToken.AppId,
UserId = accessToken.UserId
};
var param = NSDictionary.FromObjectAndKey(CurrentParameters.ToString(",").ToNs(), "fields".ToNs());
var request = new SDK.CoreKit.GraphRequest("me", param, accessToken.TokenString, null, "GET");
request.Start(new SDK.CoreKit.GraphRequestBlockHandler(GraphCallback));
}
catch (Exception e)
{
Log.For(typeof(Facebook)).Error(e);
throw;
}
}
}
