public function authenticate($user, $request, $response)
{
$accessToken = $request->get($this->tokenParam);
if (is_string($accessToken)) {
$identity = $user->loginByAccessToken($accessToken, get_class($this));
if ($identity !== null) {
return $identity;
} elseif (Client::vAccessToken($accessToken)) {
return true;
}
}
if ($accessToken !== null) {
$this->handleFailure($response);
}
return null;
}