/**
  * @param Request $request
  * @param User    $user
  *
  * @return array
  */
 public function handleOAuthCallback(Request $request, User $user = null)
 {
     $oauthVerifier = $request->get('oauth_verifier');
     $oauthToken = $request->get('oauth_token');
     $temporaryCredentials = $this->session->get('provider/' . $this->getName() . '/temporary_credentials');
     $tokenCredentials = $this->oauthClient->getTokenCredentials($temporaryCredentials, $oauthToken, $oauthVerifier);
     $userDetails = $this->oauthClient->getUserDetails($tokenCredentials);
     $accessToken = ['identifier' => $tokenCredentials->getIdentifier(), 'secret' => $tokenCredentials->getSecret(), 'username' => $userDetails->nickname];
     if (null !== $user) {
         $user->setProviderAccessToken($this->getName(), $accessToken);
     }
     return ['access_token' => $accessToken, 'scope' => null];
 }
 /**
  * @param Request $request
  * @param User    $user
  *
  * @todo passing $user should not be allowed
  */
 public function handleOAuthCallback(Request $request, User $user = null)
 {
     $code = $request->get('code');
     $token = $request->get('state');
     if (!$this->csrfProvider->isCsrfTokenValid($this->getName(), $token)) {
         throw new ProviderException('CSRF Mismatch');
     }
     $payload = ['client_id' => $this->getOAuthClientId(), 'client_secret' => $this->getOAuthClientSecret(), 'code' => $code];
     $client = clone $this->client;
     $client->setDefaultOption('headers/Accept', 'application/json');
     $request = $client->post($this->getAccessTokenUrl());
     $request->setBody(http_build_query($payload));
     $response = $request->send();
     $data = $response->json();
     if (array_key_exists('error', $data)) {
         $this->logger->error('An error occurred during authentication', ['data' => $data]);
         throw new ProviderException(sprintf('%s: %s', $data['error'], $data['error_description']));
     }
     if (null !== $user) {
         $user->setProviderAccessToken($this->getName(), $data['access_token']);
         $user->setProviderScopes($this->getName(), explode(',', $data['scope']));
     }
     return ['access_token' => $data['access_token'], 'scope' => $data['scope']];
 }