public async Task <IHttpActionResult> ExternalLogin(string provider)
{
if (!User.Identity.IsAuthenticated)
{
return(new ChallengeResult(provider, this));
}
ExternalLoginData externalLogin = ExternalLoginData.FromIdentity(User.Identity as ClaimsIdentity);
if (externalLogin == null)
{
return(InternalServerError());
}
string userId = await IdentityManager.Logins.GetUserIdForLoginAsync(externalLogin.LoginProvider,
externalLogin.ProviderKey);
bool hasRegistered = userId != null;
if (hasRegistered)
{
Authentication.SignOut(Startup.ExternalCookieAuthenticationType);
IEnumerable <Claim> claims = await ApplicationOAuthProvider.GetClaimsAsync(IdentityManager, userId);
ClaimsIdentity oAuthIdentity = ApplicationOAuthProvider.CreateIdentity(IdentityManager, claims,
OAuthOptions.AuthenticationType);
ClaimsIdentity cookieIdentity = ApplicationOAuthProvider.CreateIdentity(IdentityManager, claims,
CookieOptions.AuthenticationType);
AuthenticationProperties properties = await ApplicationOAuthProvider.CreatePropertiesAsync(
IdentityManager, userId);
Authentication.SignIn(properties, oAuthIdentity, cookieIdentity);
}
else
{
IEnumerable <Claim> claims = externalLogin.GetClaims();
ClaimsIdentity identity = ApplicationOAuthProvider.CreateIdentity(IdentityManager, claims,
OAuthOptions.AuthenticationType);
Authentication.SignIn(identity);
}
return(Ok());
}
