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<?php |
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namespace Sainsburys\Guzzle\Oauth2\GrantType; |
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use Firebase\JWT\JWT; |
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use GuzzleHttp\ClientInterface; |
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use GuzzleHttp\RequestOptions; |
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use InvalidArgumentException; |
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use Psr\Http\Message\UriInterface; |
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use SplFileObject; |
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/** |
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* JSON Web Token (JWT) Bearer Token Profiles for OAuth 2.0. |
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* |
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* @link http://tools.ietf.org/html/draft-jones-oauth-jwt-bearer-04 |
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*/ |
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class JwtBearer extends GrantTypeBase |
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{ |
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const CONFIG_PRIVATE_KEY = 'private_key'; |
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protected $grantType = 'urn:ietf:params:oauth:grant-type:jwt-bearer'; |
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/** |
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* @param ClientInterface $client |
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* @param array $config |
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*/ |
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public function __construct(ClientInterface $client, array $config = []) |
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{ |
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parent::__construct($client, $config); |
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if (!($this->config[self::CONFIG_PRIVATE_KEY] instanceof SplFileObject)) { |
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throw new InvalidArgumentException('private_key needs to be instance of SplFileObject'); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function getRequired() |
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{ |
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return array_merge(parent::getRequired(), [self::CONFIG_PRIVATE_KEY => null]); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function getAdditionalOptions() |
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{ |
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return [ |
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RequestOptions::FORM_PARAMS => [ |
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'assertion' => $this->computeJwt(), |
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], |
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]; |
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} |
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/** |
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* Compute JWT, signing with provided private key. |
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* |
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* @return string |
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*/ |
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protected function computeJwt() |
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{ |
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$baseUri = $this->client->getConfig('base_uri'); |
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$payload = [ |
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'iss' => $this->config[self::CONFIG_CLIENT_ID], |
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'aud' => sprintf('%s/%s', rtrim(($baseUri instanceof UriInterface ? $baseUri->__toString() : ''), '/'), ltrim($this->config[self::CONFIG_TOKEN_URL], '/')), |
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'exp' => time() + 60 * 60, |
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'iat' => time(), |
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]; |
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return JWT::encode($payload, $this->readPrivateKey($this->config[self::CONFIG_PRIVATE_KEY]), 'RS256'); |
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} |
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/** |
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* Read private key. |
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* |
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* @param SplFileObject $privateKey |
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* |
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* @return string |
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*/ |
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protected function readPrivateKey(SplFileObject $privateKey) |
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{ |
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$key = ''; |
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while (!$privateKey->eof()) { |
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$key .= $privateKey->fgets(); |
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} |
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return $key; |
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} |
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} |
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commerceguys /
guzzle-oauth2-plugin
