我正在尝试使用PHP验证Paypal Webhook签名，但遇到了问题。使用Paypal新的API V2版本，我在我的页面上接收到了Paypal Webhook，但似乎无法成功验证签名。
从这里获得了一些来自Paypal的示例Webhook验证PHP代码。
我无法使其工作，不知道我应该从Paypal代码中的哪里获取bootstrap.php文件。Paypal提供的信息似乎不完整或者不够完善。相比之下，设置Stripe要简单得多。
是否有人在使用Paypal API V2时，用PHP验证Paypal Webhook签名方面有经验？
<?php
//get the webhook payload
$requestBody = file_get_contents('php://input');
//check if webhook payload has data
if($requestBody) {
//request body is set
} else {
//request body is not set
exit();
}
use \PayPal\Api\VerifyWebhookSignature;
use \PayPal\Api\WebhookEvent;
$apiContext = require __DIR__ . '/bootstrap.php';
//Receive HTTP headers that you received from PayPal webhook.
$headers = getallheaders();
//need header keys to be UPPERCASE
$headers = array_change_key_case($headers, CASE_UPPER);
/*
example header paypal signature content for webhook, these values are recieved as an array, we then need to use this data to verify the payload
CONTENT-LENGTH : 1376
CORRELATION-ID : 6db85170269e7
USER-AGENT : PayPal/AUHD-214.0-54377828
CONTENT-TYPE: application/json
PAYPAL-AUTH-ALGO : SHA256withRSA
PAYPAL-CERT-URL : https://api.paypal.com/v1/notifications/certs/CERT-360caa42-fca2a784-5edc0ebc
PAYPAL-AUTH-VERSION : v2
PAYPAL-TRANSMISSION-SIG : Hc2lsDedYdSjOM4/t3T/ioAVQqFPNVB/AY/EyPNlavXk5WYUfnAmt9dyEP6neAPOjFHiVkXMK+JlLODbr6dalw6i26aFQdsPXqGl38Mafuu9elPE74qgsqNferUFgHi9QFXL+UZCNYcb4mvlDePXZIIAPbB0gOuFGOdEv2uqNwTCSAa/D8aguv1/51FWb3RkytFuVwXK/XNfIEy2oJCpDs8dgtYAZeojH8qO6IAwchdSpttMods5YfNBzT7oCoxO80hncVorBtjj1zQrkoynEB9WNNN9ytepNCkT8l29fQ4Sx/WRndm/PESCqxqmRoYJoiSosxYU3bZP7QTtILDykQ==
PAYPAL-TRANSMISSION-TIME : 2020-04-05T14:40:43Z
PAYPAL-TRANSMISSION-ID : 6dec99b0-774b-11ea-b306-c3ed128f0c4b
*/
//if any of the relevant paypal signature headers are not set exit()
if(
(!array_key_exists('PAYPAL-AUTH-ALGO', $headers)) ||
(!array_key_exists('PAYPAL-TRANSMISSION-ID', $headers)) ||
(!array_key_exists('PAYPAL-CERT-URL', $headers)) ||
(!array_key_exists('PAYPAL-TRANSMISSION-SIG', $headers)) ||
(!array_key_exists('PAYPAL-TRANSMISSION-TIME', $headers))
)
{
exit();
}
//specify the ID for the webhook that you have set up on the paypal developer website, each web hook that you create has a unique ID
$webhookID = "ENTER_YOUR_WEBHOOK_ID_HERE";
//start paypal webhook signature validation
$signatureVerification = new VerifyWebhookSignature();
$signatureVerification->setAuthAlgo($headers['PAYPAL-AUTH-ALGO']);
$signatureVerification->setTransmissionId($headers['PAYPAL-TRANSMISSION-ID']);
$signatureVerification->setCertUrl($headers['PAYPAL-CERT-URL']);
$signatureVerification->setWebhookId($webhookID);
$signatureVerification->setTransmissionSig($headers['PAYPAL-TRANSMISSION-SIG']);
$signatureVerification->setTransmissionTime($headers['PAYPAL-TRANSMISSION-TIME']);
$signatureVerification->setRequestBody($requestBody);
$request = clone $signatureVerification;
try {
$output = $signatureVerification->post($apiContext);
} catch (Exception $ex) {
//error during signature validation, capture error and exit
ResultPrinter::printError("Validate Received Webhook Event", "WebhookEvent", null, $request->toJSON(), $ex);
exit(1);
}
$sigVerificationResult = $output->getVerificationStatus();
// $sigVerificationResult is a string and will either be "SUCCESS" or "FAILURE"
//if not webhook signature failed validation exit
if($sigVerificationResult != "SUCCESS"){
exit();
}
else if($sigVerificationResult == "SUCCESS"){
//paypay webhook signature is valid
//proceed to process webhook payload
//decode raw request body
$requestBodyDecode = json_decode($requestBody);
//pull whatever info required from decoded request body, some examples below
$paymentSystemID = $requestBodyDecode->id;
$eventType = $requestBodyDecode->event_type;
//do something with info captured from the webhook payload
}
这似乎适用于php 8.2：
if (openssl_verify(
data: implode(separator: '|', array: [
$httpPayPalTransmissionId,
$httpPayPalTransmissionTime,
$webhookID,
crc32(string: $rawRequestBody),
]),
signature: base64_decode(string: $httpPayPalTransmissionSignature),
public_key: openssl_pkey_get_public(public_key: file_get_contents(filename: $httpPayPalCertUrl)),
algorithm: 'sha256WithRSAEncryption'
) === 1) {
die('OK');
} else {
die('FAILED');
}
$cachedHttpPayPalCertUrl对应于接收到的标头中的PAYPAL-CERT-URL，其中包含他们的证书URL。 - Bruno Leveque