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<?php |
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declare(strict_types=1); |
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namespace Cakasim\Payone\Sdk\Redirect\Token\Format; |
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use Cakasim\Payone\Sdk\Config\ConfigExceptionInterface; |
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use Cakasim\Payone\Sdk\Config\ConfigInterface; |
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use Cakasim\Payone\Sdk\Redirect\Token\Token; |
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use Cakasim\Payone\Sdk\Redirect\Token\TokenInterface; |
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/** |
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* @author Fabian Böttcher <[email protected]> |
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* @since 0.1.0 |
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*/ |
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class Decoder implements DecoderInterface |
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{ |
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/** |
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* @var ConfigInterface The SDK config. |
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*/ |
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protected $config; |
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/** |
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* @var SignerInterface The token signer. |
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*/ |
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protected $signer; |
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/** |
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* Constructs the token encoder. |
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* |
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* @param ConfigInterface $config The SDK config. |
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* @param SignerInterface $signer The token signer. |
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*/ |
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public function __construct(ConfigInterface $config, SignerInterface $signer) |
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{ |
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$this->config = $config; |
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$this->signer = $signer; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function decode(string $token): TokenInterface |
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{ |
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$token = explode('.', $token, 4); |
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if (count($token) !== 3) { |
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throw new DecoderException("Failed token decoding, the token encoded format is invalid."); |
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} |
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// Collect parts of the token. |
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$iv = $token[0]; |
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$signature = $token[2]; |
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$token = $token[1]; |
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// Decode the URL safe encoded token parts. |
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$iv = $this->urlSafeDecode($iv); |
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$signature = $this->urlSafeDecode($signature); |
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$token = $this->urlSafeDecode($token); |
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try { |
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// Create the expected (valid) signature of the token payload data. |
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$expectedSignature = $this->signer->createSignature($token); |
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} catch (SignerExceptionInterface $e) { |
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throw new DecoderException("Failed token decoding, could not create trusted token signature.", 0, $e); |
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} |
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// Ensure that signatures match. |
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if ($signature !== $expectedSignature) { |
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throw new DecoderException("Failed token decoding, the token signature is invalid."); |
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} |
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try { |
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// Load token encryption config. |
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$encryptionMethod = $this->config->get('redirect.token_encryption_method'); |
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$encryptionKey = $this->config->get('redirect.token_encryption_key'); |
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} catch (ConfigExceptionInterface $e) { |
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throw new DecoderException("Failed token decoding, the token encryption config is incomplete.", 0, $e); |
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} |
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// Get binary SHA-256 hash of cleartext encryption key. |
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$encryptionKey = hash('sha256', $encryptionKey, true); |
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// Decrypt the token payload data. |
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$token = $this->decrypt($token, $encryptionMethod, $encryptionKey, $iv); |
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// JSON decode the token payload. |
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$token = json_decode($token, true); |
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if (!is_array($token)) { |
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throw new DecoderException("Failed token decoding, the token payload data is invalid."); |
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} |
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return new Token($token); |
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} |
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/** |
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* Decodes the provided URL-safe encoded data. |
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* |
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* @param string $data The encoded data to decode. |
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* @return string The decoded data. |
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* @throws DecoderExceptionInterface If decoding fails. |
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*/ |
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protected function urlSafeDecode(string $data): string |
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{ |
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$data = strtr($data, '-_', '+/'); |
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$data = base64_decode($data, true); |
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if ($data === false) { |
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throw new DecoderException("Failed token decoding, the token could not be base64 decoding."); |
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} |
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return $data; |
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} |
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/** |
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* Decrypts the provided data. |
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* |
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* @param string $data The data to decrypt. |
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* @param string $method The cipher method. |
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* @param string $key The encryption key. |
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* @param string $iv The initialization vector. |
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* @return string The decrypted data. |
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* @throws DecoderException If the decryption fails. |
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*/ |
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protected function decrypt(string $data, string $method, string $key, string $iv): string |
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{ |
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$data = openssl_decrypt($data, $method, $key, OPENSSL_RAW_DATA, $iv); |
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if (!is_string($data)) { |
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throw new DecoderException("Failed token decoding, the token could not be decrypted."); |
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} |
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return $data; |
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} |
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} |
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Cakasim /
php-payone-sdk
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