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<?php |
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namespace Xsolla\SDK\Webhook; |
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use Symfony\Component\HttpFoundation\IpUtils; |
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use Xsolla\SDK\Exception\Webhook\InvalidClientIpException; |
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use Xsolla\SDK\Exception\Webhook\InvalidSignatureException; |
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class WebhookAuthenticator |
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{ |
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protected static $xsollaSubnets = [ |
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'159.255.220.240/28', |
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'185.30.20.16/29', |
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'185.30.21.0/24', |
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'185.30.21.16/29', |
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]; |
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/** |
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* @var string |
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*/ |
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protected $projectSecretKey; |
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/** |
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* @param string $projectSecretKey |
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*/ |
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public function __construct($projectSecretKey) |
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{ |
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$this->projectSecretKey = $projectSecretKey; |
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} |
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/** |
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* @param WebhookRequest $webhookRequest |
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* @param bool $checkClientIp |
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* |
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* @throws InvalidClientIpException |
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* @throws InvalidSignatureException |
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*/ |
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public function authenticate(WebhookRequest $webhookRequest, $checkClientIp = true) |
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{ |
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if (true === $checkClientIp) { |
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$this->authenticateClientIp($webhookRequest->getClientIp()); |
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} |
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$this->authenticateSignature($webhookRequest); |
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} |
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/** |
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* @param string $clientIp |
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* |
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* @throws InvalidClientIpException |
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*/ |
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public function authenticateClientIp($clientIp) |
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{ |
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if (false === IpUtils::checkIp($clientIp, self::$xsollaSubnets)) { |
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throw new InvalidClientIpException(sprintf( |
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'Client IP address (%s) not found in allowed IP addresses whitelist (%s). Please check troubleshooting section in README.md https://github.com/xsolla/xsolla-sdk-php#troubleshooting', |
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$clientIp, |
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implode(', ', self::$xsollaSubnets) |
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)); |
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} |
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} |
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/** |
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* @param WebhookRequest $webhookRequest |
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* |
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* @throws InvalidSignatureException |
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*/ |
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public function authenticateSignature(WebhookRequest $webhookRequest) |
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{ |
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$headers = $webhookRequest->getHeaders(); |
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if (!array_key_exists('authorization', $headers)) { |
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throw new InvalidSignatureException('"Authorization" header not found in Xsolla webhook request. Please check troubleshooting section in README.md https://github.com/xsolla/xsolla-sdk-php#troubleshooting'); |
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} |
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$matches = []; |
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preg_match('~^Signature ([0-9a-f]{40})$~', $headers['authorization'], $matches); |
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if (array_key_exists(1, $matches)) { |
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$clientSignature = $matches[1]; |
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} else { |
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throw new InvalidSignatureException('Signature not found in "Authorization" header from Xsolla webhook request: '.$headers['authorization']); |
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} |
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$serverSignature = sha1($webhookRequest->getBody().$this->projectSecretKey); |
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if ($clientSignature !== $serverSignature) { |
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throw new InvalidSignatureException("Invalid Signature. Signature provided in \"Authorization\" header ($clientSignature) does not match with expected"); |
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} |
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} |
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} |
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xsolla /
xsolla-sdk-php
