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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| <?php | ||
| namespace Ingenico\Connect\Sdk\Webhooks; | ||
|
|
||
| /** | ||
| * Class SignatureValidator | ||
| * | ||
| * @package Ingenico\Connect\Sdk\Webhooks | ||
| */ | ||
| class SignatureValidator | ||
| { | ||
| /** @var SecretKeyStore */ | ||
| private $secretKeyStore; | ||
|
|
||
| /** | ||
| * @param SecretKeyStore $secretKeyStore | ||
| */ | ||
| public function __construct(SecretKeyStore $secretKeyStore) | ||
| { | ||
| $this->secretKeyStore = $secretKeyStore; | ||
| } | ||
|
|
||
| /** | ||
| * Validates the given body using the given request headers. | ||
| * @param string $body | ||
| * @param array $requestHeaders | ||
| * @throws SignatureValidationException | ||
| */ | ||
| public function validate($body, $requestHeaders) | ||
| { | ||
| $this->validateBody($body, $requestHeaders); | ||
| } | ||
|
|
||
| // utility methods | ||
|
|
||
| private function validateBody($body, $requestHeaders) | ||
| { | ||
| $signature = $this->getHeaderValue($requestHeaders, 'X-GCS-Signature'); | ||
| $keyId = $this->getHeaderValue($requestHeaders, 'X-GCS-KeyId'); | ||
| $secretKey = $this->secretKeyStore->getSecretKey($keyId); | ||
|
|
||
| $expectedSignature = base64_encode(hash_hmac("sha256", $body, $secretKey, true)); | ||
|
|
||
| $isValid = $this->areEqualSignatures($signature, $expectedSignature); | ||
| if (!$isValid) { | ||
| throw new SignatureValidationException("failed to validate signature '$signature'"); | ||
| } | ||
| } | ||
|
|
||
| private function areEqualSignatures($signature, $expectedSignature) { | ||
| if (function_exists('hash_equals')) { | ||
| return hash_equals($expectedSignature, $signature); | ||
| } else { | ||
| // copied from http://php.net/manual/en/function.hash-equals.php#115635 | ||
| if(strlen($expectedSignature) != strlen($signature)) { | ||
| return false; | ||
| } else { | ||
| $res = $expectedSignature ^ $signature; | ||
| $ret = 0; | ||
| for($i = strlen($res) - 1; $i >= 0; $i--) $ret |= ord($res[$i]); | ||
| return !$ret; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // general utility methods | ||
|
|
||
| private function getHeaderValue($requestHeaders, $headerName) { | ||
| $lowerCaseHeaderName = strtolower($headerName); | ||
| foreach ($requestHeaders as $name => $value) { | ||
| if ($lowerCaseHeaderName === strtolower($name)) { | ||
| return $value; | ||
| } | ||
| } | ||
| throw new SignatureValidationException("could not find header '$headerName'"); | ||
| } | ||
| } |
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