public function validate()

in src/MessageValidator.php [83:115]
27 lines of code
6 McCabe index (conditional complexity)

    public function validate(Message $message)
    {
        if (self::isLambdaStyle($message)) {
            $message = self::convertLambdaMessage($message);
        }

        // Get the certificate.
        $this->validateUrl($message['SigningCertURL']);
        $certificate = call_user_func($this->certClient, $message['SigningCertURL']);
        if ($certificate === false) {
            throw new InvalidSnsMessageException(
                "Cannot get the certificate from \"{$message['SigningCertURL']}\"."
            );
        }

        // Extract the public key.
        $key = openssl_get_publickey($certificate);
        if (!$key) {
            throw new InvalidSnsMessageException(
                'Cannot get the public key from the certificate.'
            );
        }

        // Verify the signature of the message.
        $content = $this->getStringToSign($message);
        $signature = base64_decode($message['Signature']);
        $algo = ($message['SignatureVersion'] === self::SIGNATURE_VERSION_1 ? OPENSSL_ALGO_SHA1 : OPENSSL_ALGO_SHA256);
        if (openssl_verify($content, $signature, $key, $algo) !== 1) {
            throw new InvalidSnsMessageException(
                'The message signature is invalid.'
            );
        }
    }