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<?php
namespace Stripe;
abstract class Webhook
{
const DEFAULT_TOLERANCE = 300;
/**
* Returns an Event instance using the provided JSON payload. Throws an
* Exception\UnexpectedValueException if the payload is not valid JSON, and
* an Exception\SignatureVerificationException if the signature
* verification fails for any reason.
*
* @param string $payload the payload sent by Stripe
* @param string $sigHeader the contents of the signature header sent by
* Stripe
* @param string $secret secret used to generate the signature
* @param int $tolerance maximum difference allowed between the header's
* timestamp and the current time
*
* @throws Exception\UnexpectedValueException if the payload is not valid JSON,
* @throws Exception\SignatureVerificationException if the verification fails
*
* @return Event the Event instance
*/
public static function constructEvent($payload, $sigHeader, $secret, $tolerance = self::DEFAULT_TOLERANCE)
{
WebhookSignature::verifyHeader($payload, $sigHeader, $secret, $tolerance);
$data = \json_decode($payload, true);
$jsonError = \json_last_error();
if (null === $data && \JSON_ERROR_NONE !== $jsonError) {
$msg = "Invalid payload: {$payload} "
. "(json_last_error() was {$jsonError})";
throw new Exception\UnexpectedValueException($msg);
}
return Event::constructFrom($data);
}
}
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