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using System;
using Xamarin.Auth;
namespace Xamarin_GoogleAuth.Authentication
{
public class GoogleAuthenticator
{
private const string AuthorizeUrl = "https://accounts.google.com/o/oauth2/v2/auth";
private const string AccessTokenUrl = "https://www.googleapis.com/oauth2/v4/token";
private const bool IsUsingNativeUI = true;
private OAuth2Authenticator _auth;
private IGoogleAuthenticationDelegate _authenticationDelegate;
public GoogleAuthenticator(string clientId, string scope, string redirectUrl, IGoogleAuthenticationDelegate authenticationDelegate)
{
_authenticationDelegate = authenticationDelegate;
_auth = new OAuth2Authenticator(clientId, string.Empty, scope,
new Uri(AuthorizeUrl),
new Uri(redirectUrl),
new Uri(AccessTokenUrl),
null, IsUsingNativeUI);
_auth.Completed += OnAuthenticationCompleted;
_auth.Error += OnAuthenticationFailed;
}
public OAuth2Authenticator GetAuthenticator()
{
return _auth;
}
public void OnPageLoading(Uri uri)
{
_auth.OnPageLoading(uri);
}
private void OnAuthenticationCompleted(object sender, AuthenticatorCompletedEventArgs e)
{
if (e.IsAuthenticated)
{
var token = new GoogleOAuthToken
{
TokenType = e.Account.Properties["token_type"],
AccessToken = e.Account.Properties["access_token"]
};
_authenticationDelegate.OnAuthenticationCompleted(token);
}
else
{
_authenticationDelegate.OnAuthenticationCanceled();
}
}
private void OnAuthenticationFailed(object sender, AuthenticatorErrorEventArgs e)
{
_authenticationDelegate.OnAuthenticationFailed(e.Message, e.Exception);
}
}
}