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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 $tolerance maximum difference allowed between the header's
* timestamp and the current time
* @return Event the Event instance
* @throws Exception\UnexpectedValueException if the payload is not valid JSON,
* @throws Exception\SignatureVerificationException if the verification fails.
*/
public static function constructEvent($payload, $sigHeader, $secret, $tolerance = self::DEFAULT_TOLERANCE)
{
WebhookSignature::verifyHeader($payload, $sigHeader, $secret, $tolerance);
$data = json_decode($payload, true);
$jsonError = json_last_error();
if ($data === null && $jsonError !== JSON_ERROR_NONE) {
$msg = "Invalid payload: $payload "
. "(json_last_error() was $jsonError)";
throw new Exception\UnexpectedValueException($msg);
}
$event = Event::constructFrom($data);
return $event;
}
}