<?php

class AlipayNotify
{
	/**
     * HTTPS形式消息验证地址
     */
	public $https_verify_url = 'https://mapi.alipay.com/gateway.do?service=notify_verify&';
	/**
     * HTTP形式消息验证地址
     */
	public $http_verify_url = 'http://notify.alipay.com/trade/notify_query.do?';
	public $alipay_config;

	public function __construct($alipay_config)
	{
		$this->alipay_config = $alipay_config;
	}

	public function AlipayNotify($alipay_config)
	{
		$this->__construct($alipay_config);
	}

	public function verifyNotify()
	{
		if (empty($_POST)) {
			return false;
		}
		else {
			$isSign = $this->getSignVeryfy($_POST, $_POST['sign']);
			$responseTxt = 'false';

			if (!empty($_POST['notify_id'])) {
				$responseTxt = $this->getResponse($_POST['notify_id']);
			}

			if (preg_match('/true$/i', $responseTxt) && $isSign) {
				return true;
			}
			else {
				return false;
			}
		}
	}

	public function verifyReturn()
	{
		if (empty($_GET)) {
			return false;
		}
		else {
			$isSign = $this->getSignVeryfy($_GET, $_GET['sign']);
			$responseTxt = 'false';

			if (!empty($_GET['notify_id'])) {
				$responseTxt = $this->getResponse($_GET['notify_id']);
			}

			if (preg_match('/true$/i', $responseTxt) && $isSign) {
				return true;
			}
			else {
				return false;
			}
		}
	}

	public function getSignVeryfy($para_temp, $sign)
	{
		$para_filter = paraFilter($para_temp);
		$para_sort = argSort($para_filter);
		$prestr = createLinkstring($para_sort);
		$isSgin = false;

		switch (strtoupper(trim($this->alipay_config['sign_type']))) {
		case 'MD5':
			$isSgin = md5Verify($prestr, $sign, $this->alipay_config['key']);
			break;

		default:
			$isSgin = false;
		}

		return $isSgin;
	}

	public function getResponse($notify_id)
	{
		$transport = strtolower(trim($this->alipay_config['transport']));
		$partner = trim($this->alipay_config['partner']);
		$veryfy_url = '';

		if ($transport == 'https') {
			$veryfy_url = $this->https_verify_url;
		}
		else {
			$veryfy_url = $this->http_verify_url;
		}

		$veryfy_url = $veryfy_url . 'partner=' . $partner . '&notify_id=' . $notify_id;
		$responseTxt = getHttpResponseGET($veryfy_url, $this->alipay_config['cacert']);
		return $responseTxt;
	}
}

require_once 'alipay_core.function.php';
require_once 'alipay_md5.function.php';

?>