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<?php |
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namespace Superbrave\AuthZeroHttpClient; |
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use Symfony\Component\Cache\Adapter\ArrayAdapter; |
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use Symfony\Component\HttpClient\DecoratorTrait; |
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use Symfony\Contracts\Cache\CacheInterface; |
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use Symfony\Contracts\Cache\ItemInterface; |
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use Symfony\Contracts\HttpClient\HttpClientInterface; |
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use Symfony\Contracts\HttpClient\ResponseInterface; |
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/** |
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* Handles authentication with Auth0 before actual requests are made. |
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* |
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* @author Niels Nijens <[email protected]> |
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*/ |
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class AuthZeroAuthenticatingHttpClient implements HttpClientInterface |
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{ |
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use DecoratorTrait; |
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public function __construct( |
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HttpClientInterface $client, |
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private readonly AuthZeroConfiguration $authZeroConfiguration, |
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private ArrayAdapter|CacheInterface|null $accessTokenCache = null, |
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) { |
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if ($this->accessTokenCache === null) { |
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$this->accessTokenCache = new ArrayAdapter(); |
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} |
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$this->client = $client; |
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} |
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/** |
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* Requests a JSON Web Token at Auth0 before executing the requested request. |
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* |
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* {@inheritdoc} |
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*/ |
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public function request(string $method, string $url, array $options = []): ResponseInterface |
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{ |
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$this->appendAuthBearerToRequestOptions($options); |
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return $this->client->request($method, $url, $options); |
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} |
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/** |
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* Appends the 'auth_bearer' option with the retrieved access token from Auth0. |
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*/ |
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private function appendAuthBearerToRequestOptions(array &$options): void |
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{ |
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if (isset($options['auth_bearer'])) { |
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return; |
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} |
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$accessToken = $this->getAccessTokenFromCache(); |
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if ($accessToken instanceof AccessToken) { |
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$options['auth_bearer'] = $accessToken->getToken(); |
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} |
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} |
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/** |
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* Returns an access token from the cache by the configured audience in the AuthZeroConfiguration. |
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*/ |
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private function getAccessTokenFromCache(): ?AccessToken |
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{ |
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// Replace invalid cache key characters with an underscore. |
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$cacheKey = preg_replace('#[\{\}\(\)\/\\\@:]+#', '_', $this->authZeroConfiguration->getAudience()); |
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if (!$this->accessTokenCache instanceof CacheInterface) { |
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return null; |
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} |
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return $this->accessTokenCache->get( |
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$cacheKey, |
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function (ItemInterface $item) { |
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return $this->getNewAccessTokenForCache($item); |
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} |
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); |
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} |
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/** |
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* Requests and returns a new AccessToken. |
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* |
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* This method is called by the access token cache on a cache miss. |
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*/ |
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private function getNewAccessTokenForCache(ItemInterface $item): ?AccessToken |
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{ |
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$accessToken = $this->requestAccessToken(); |
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if ($accessToken !== null) { |
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$item->expiresAfter($accessToken->getTtl()); |
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} |
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return $accessToken; |
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} |
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/** |
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* Requests an access token at Auth0. |
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*/ |
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private function requestAccessToken(): ?AccessToken |
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{ |
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$response = $this->client->request( |
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'POST', |
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$this->authZeroConfiguration->getTenantTokenUrl(), |
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[ |
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'json' => $this->authZeroConfiguration->getAuthenticationPayload(), |
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] |
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); |
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if ($response->getStatusCode() !== 200) { |
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return null; |
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} |
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$responseJson = $response->toArray(); |
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if (isset($responseJson['access_token'], $responseJson['expires_in']) === false) { |
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return null; |
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} |
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return new AccessToken($responseJson['access_token'], $responseJson['expires_in']); |
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} |
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} |
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superbrave /
auth0-http-client
