<?php
|
|
namespace Alipay\EasySDK\Kernel\Util;
|
|
use Alipay\EasySDK\Kernel\AlipayConstants;
|
|
class SignContentExtractor
|
{
|
private $RESPONSE_SUFFIX = "_response";
|
private $ERROR_RESPONSE = "error_response";
|
|
/**
|
* @param $body string 网关的整体响应字符串
|
* @param $method string 本次调用的OpenAPI接口名称
|
* @return false|string|null 待验签的原文
|
*/
|
public function getSignSourceData($body, $method)
|
{
|
$rootNodeName = str_replace(".", "_", $method) . $this->RESPONSE_SUFFIX;
|
$rootIndex = strpos($body, $rootNodeName);
|
if ($rootIndex !== strrpos($body, $rootNodeName)) {
|
throw new \Exception('检测到响应报文中有重复的' . $rootNodeName . ',验签失败。');
|
}
|
$errorIndex = strpos($body, $this->ERROR_RESPONSE);
|
if ($rootIndex > 0) {
|
return $this->parserJSONSource($body, $rootNodeName, $rootIndex);
|
} else if ($errorIndex > 0) {
|
return $this->parserJSONSource($body, $this->ERROR_RESPONSE, $errorIndex);
|
} else {
|
return null;
|
}
|
}
|
|
/**
|
*
|
* @param $responseContent
|
* @param $nodeName
|
* @param $nodeIndex
|
* @return false|string|null
|
*/
|
function parserJSONSource($responseContent, $nodeName, $nodeIndex)
|
{
|
$signDataStartIndex = $nodeIndex + strlen($nodeName) + 2;
|
if (strrpos($responseContent, AlipayConstants::ALIPAY_CERT_SN_FIELD)) {
|
$signIndex = strrpos($responseContent, "\"" . AlipayConstants::ALIPAY_CERT_SN_FIELD . "\"");
|
} else {
|
$signIndex = strrpos($responseContent, "\"" . AlipayConstants::SIGN_FIELD . "\"");
|
}
|
// 签名前-逗号
|
$signDataEndIndex = $signIndex - 1;
|
$indexLen = $signDataEndIndex - $signDataStartIndex;
|
if ($indexLen < 0) {
|
return null;
|
}
|
return substr($responseContent, $signDataStartIndex, $indexLen);
|
}
|
|
}
|
