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<?php |
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namespace tbclla\Revolut\Auth; |
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use Exception; |
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use Firebase\JWT\JWT; |
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use tbclla\Revolut\Exceptions\ConfigurationException; |
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class ClientAssertion |
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{ |
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/** |
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* The client assertion type |
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* @link https://revolut-engineering.github.io/api-docs/business-api/#oauth-exchange-authorisation-code |
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* |
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* @var string |
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*/ |
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const TYPE = 'urn:ietf:params:oauth:client-assertion-type:jwt-bearer'; |
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/** |
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* The JWT's audience parameter |
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* @link https://revolut-engineering.github.io/api-docs/business-api/#authentication-setting-up-access-to-your-business-account |
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* |
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* @var string |
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*/ |
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const AUDIENCE = 'https://revolut.com'; |
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/** |
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* The JWT's algorythm parameter |
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* @link https://revolut-engineering.github.io/api-docs/business-api/#authentication-setting-up-access-to-your-business-account |
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* |
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* @var string |
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*/ |
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const ALGORYTHM = 'RS256'; |
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/** |
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* The JWT client |
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* |
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* @var \firebase\JWT\JWT |
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*/ |
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private $jwtClient; |
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/** |
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* The client ID |
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* |
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* @var string |
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*/ |
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public $clientId; |
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/** |
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* The private key path |
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* |
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* @var string |
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*/ |
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private $privateKey; |
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/** |
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* The redirect URI |
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* |
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* @var string |
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*/ |
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private $redirectUri; |
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/** |
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* Create a new client assertion |
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* |
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* @param string $clientId The client ID |
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* @param string $privateKey The path to the private key |
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* @param string $redirectUri The Oauth redirect URI |
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* @return void |
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*/ |
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public function __construct(string $clientId, string $privateKey, string $redirectUri) |
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{ |
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$this->jwtClient = new JWT; |
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$this->clientId = $clientId; |
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$this->privateKey = $privateKey; |
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$this->redirectUri = $redirectUri; |
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} |
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/** |
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* Build the JWT |
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* |
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* @return string The assertion string |
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* @throws \tbclla\Revolut\Exceptions\ConfigurationException |
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*/ |
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public function build() |
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{ |
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try { |
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return $this->jwtClient->encode($this->buildPayload(), $this->getPrivateKey(), self::ALGORYTHM); |
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} catch (Exception $e) { |
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throw new ConfigurationException('Failed to create JWT - ' . $e->getMessage(), null, $e); |
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} |
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} |
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/** |
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* Build the payload for the JWT |
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* |
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* @return array |
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*/ |
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private function buildPayload() |
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{ |
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return [ |
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'sub' => $this->clientId, |
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'iss' => $this->getIssuer(), |
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'exp' => self::getExpiration(), |
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'aud' => self::AUDIENCE, |
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]; |
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} |
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/** |
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* Get the contents of the private key |
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* |
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* @return string |
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* @throws \tbclla\Revolut\Exceptions\ConfigurationException |
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*/ |
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private function getPrivateKey() |
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{ |
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try { |
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return file_get_contents($this->privateKey); |
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} catch (Exception $e) { |
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throw new ConfigurationException('Private Key not configured correctly! ' . $e->getMessage(), null, $e); |
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} |
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} |
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/** |
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* Get the JWT issuer |
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* |
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* @return string |
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* @throws \tbclla\Revolut\Exceptions\ConfigurationException |
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*/ |
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private function getIssuer() |
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{ |
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$domain = parse_url($this->redirectUri); |
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if (empty($domain['host'])) { |
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throw new ConfigurationException('Invalid redirect URI.'); |
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} |
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return $domain['host']; |
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} |
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/** |
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* Get the expiration time in the form of a unix timestamp |
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* |
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* @return int |
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*/ |
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private static function getExpiration() |
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{ |
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return time() + (60 * 5); |
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} |
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} |
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tbclla /
laravel-revolut-business
