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基于H5的微信支付开发详解

时间:2020-09-05 21:00:08 作者:重庆seo小潘 来源:
这次总结一下用户在微信内打开网页时,可以调用微信支付完成下单功能的模块开发,也就是在微信内的H5页面通过jsApi接口实现支付功能。当然了,微信官网上的微信支付开发文档也讲解的很详细,并且有实现代码可供参考,有的朋友直接看文档就可以自己实现此支付

这次总结一下用户在微信内打开网页时,可以调用微信支付完成下单功能的模块开发,也就是在微信内的H5页面通过jsApi接口实现支付功能。当然了,微信官网上的微信支付开发文档也讲解的很详细,并且有实现代码可供参考,有的朋友直接看文档就可以自己实现此支付接口的开发了。

  一、前言

  为何我还写一篇微信支付接口的博文呢?第一,我们必须知道,所谓的工作经验很多都是靠总结出来的,你只有总结了更多知识,积累了更多经验,你才能在该行业中脱颖而出,我个人觉得如今的招聘,很多都需要工作经验(1年、3年、5年....),其实,工作时间的长久不能衡量一个人技术水平的高低,有的人一年的工作经验能拿3年工作经验的程序猿的工资,有的3年工作经验的却有可能比别人只有一年工作经验的还低,所以说,总结才能让自己的知识体系,经验深度更牛逼更稳固(虽然写一篇博文挺花费时间的);第二,写博文分享给大家还是挺有成就感的,首先是能让新手从我分享的博文中能学到东西,并且能快速将博文所讲解的技术运用到实际中来,所以我写的博文基本上能让新人快速读懂并且容易理解,另外,技术大神的话,看到博文有讲解的不对之处,还可以指出,并且可以交流,何乐而不为呢,我们需要的就是分享和交流。

  扯远了,直接进入该主题的详解。

  现在的微信支付方式有N种,看下图,有刷卡支付、公众号支付、扫码支付和APP支付,另外还有支付工具的开发,本博文选择的是公众号支付借口而开发进行讲解,其他几种支付接口开发基本上思路都是一样的,只要你能看懂我这博文所讲解的基本思路,你基本上也能独自开发其他几个支付接口。

基于H5的微信支付开发详解

  二、思路详解

  我们可以拿微信支付接口文档里的业务流程时序图看看,如下图,基本思路是这样子:首先在后台生成一个链接,展示给用户让用户点击(例如页面上有微信支付的按钮),用户点击按钮后,网站后台会根据订单的相关信息生成一个支付订单,此时会调用统一下单接口,对微信支付系统发起请求,而微信支付系统受到请求后,会根据请求过来的数据,生成一个 预支付交易会话标识(prepay_id,就是通过这个来识别该订单的),我们的网站收到微信支付系统的响应后,会得到prepay_id,然后通过自己构造微信支付所需要的参数,接着将支付所需参数返回给客户端,用户此时可能会有一个订单信息页,会有一个按钮,点击支付,此时会调用JSAPI接口对微信支付系统发起 请求支付,微信支付系统检查了请求的相关合法性之后,就会提示输入密码,用户此时输入密码确认,微信支付系统会对其进行验证,通过的话会返回支付结果,然后微信跳转会H5页面,这其中有一步是异步通知网站支付结果,我们网站需要对此进行处理(比如说异步支付结果通过后,需要更新数据表或者订单信息,例如标志用户已支付该订单了,同时也需要更新订单日志,防止用户重复提交订单)。

基于H5的微信支付开发详解

  三、代码讲解

  本次开发环境用的是php5.6 + MySQL + Redis + Linux + Apache,所选用的框架的CI框架(这些环境不一定需要和我的一致,框架也可以自己选择,反正自己稍微修改下代码就能移植过去了)。

  微信支付接口的开发代码我已经提前写好了,在这里我对其进行分析讲解,方便大家能轻松理解,当然,假如你有一定的基础,直接看代码就能理清所有流程了,并且我的代码基本上都写上了注释(对于新手来说,这一点比微信文档所提供的代码好一点)。

  1、构造一个链接展示给用户

  这里我们提前需要知道一个点,那就是请求统一下单接口需要微信用户的openid(详情可看这https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1),而获取openid需要先获取code(详情可看这微信登录接口),所以我们需要构造一个获取code的URL:

Wxpay.php文件:<?phpdefined('BASEPATH') OR exit('No direct script access allowed');class Wxpay extends MY_Controller {public function __construct() {parent::__construct();$this->load->model('wxpay_model');//$this->load->model('wxpay');}public function index() {//微信支付$this->smarty['wxPayUrl'] = $this->wxpay_model->retWxPayUrl();$this->displayView('wxpay/index.tpl');}}

  在这先看看model里所写的几个类:model里有几个类:微信支付类、统一下单接口类、响应型接口基类、请求型接口基类、所有接口基类、配置类。为何要分那么多类而不在一个类里实现所有的方法的,因为,这样看起来代码逻辑清晰,哪个类该干嘛就干嘛。

  这里我直接附上model的代码了,里面基本上每一个类每一个方法甚至每一行代码都会有解释的了,这里我就不对其展开一句句分析了:

<?phpdefined('BASEPATH') OR exit('No direct script access allowed');class Wxpay_model extends CI_Model {public function __construct() {parent::__construct();}/*** 返回可以获得微信code的URL (用以获取openid)* @return [type] [description]*/public function retWxPayUrl() {$jsApi = new JsApi_handle();return $jsApi->createOauthUrlForCode();}/*** 微信jsapi点击支付* @param[type] $data [description]* @return [type][description]*/public function wxPayJsApi($data) {$jsApi = new JsApi_handle();//统一下单接口所需数据$payData = $this->returnData($data);//获取code码,用以获取openid$code = $_GET['code'];$jsApi->setCode($code);//通过code获取openid$openid = $jsApi->getOpenId();$unifiedOrderResult = null;if ($openid != null) {//取得统一下单接口返回的数据$unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);//获取订单接口状态$returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');if ($returnMessage['resultCode']) {$jsApi->setPrepayId($retuenMessage['resultField']);//取得wxjsapi接口所需要的数据$returnMessage['resultData'] = $jsApi->getParams();}return $returnMessage;}}/*** 统一下单接口所需要的数据* @param[type] $data [description]* @return [type][description]*/public function returnData($data) {$payData['sn'] = $data['sn'];$payData['body'] = $data['goods_name'];$payData['out_trade_no'] = $data['order_no'];$payData['total_fee'] = $data['fee'];$payData['attach'] = $data['attach'];return $payData;}/*** 返回统一下单接口结果 (参考https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)* @param[type] $payData[description]* @param[type] $trade_type [description]* @param[type] $openid[description]* @return [type][description]*/public function getResult($payData, $trade_type, $openid = null) {$unifiedOrder = new UnifiedOrder_handle();if ($opneid != null) {$unifiedOrder->setParam('openid', $openid);}$unifiedOrder->setParam('body', $payData['body']);//商品描述$unifiedOrder->setParam('out_trade_no', $payData['out_trade_no']); //商户订单号$unifiedOrder->setParam('total_fee', $payData['total_fee']);//总金额$unifiedOrder->setParam('attach', $payData['attach']);//附加数据$unifiedOrder->setParam('notify_url', base_url('/Wxpay/pay_callback'));//通知地址$unifiedOrder->setParam('trade_type', $trade_type); //交易类型//非必填参数,商户可根据实际情况选填//$unifiedOrder->setParam("sub_mch_id","XXXX");//子商户号//$unifiedOrder->setParam("device_info","XXXX");//设备号//$unifiedOrder->setParam("time_start","XXXX");//交易起始时间//$unifiedOrder->setParam("time_expire","XXXX");//交易结束时间//$unifiedOrder->setParam("goods_tag","XXXX");//商品标记//$unifiedOrder->setParam("product_id","XXXX");//商品IDreturn $unifiedOrder->getResult();}/*** 返回微信订单状态*/public function returnMessage($unifiedOrderResult,$field){$arrMessage=array("resultCode"=>0,"resultType"=>"获取错误","resultMsg"=>"该字段为空");if($unifiedOrderResult==null){$arrMessage["resultType"]="未获取权限";$arrMessage["resultMsg"]="请重新打开页面";}elseif ($unifiedOrderResult["return_code"] == "FAIL"){$arrMessage["resultType"]="网络错误";$arrMessage["resultMsg"]=$unifiedOrderResult['return_msg'];}elseif($unifiedOrderResult["result_code"] == "FAIL"){$arrMessage["resultType"]="订单错误";$arrMessage["resultMsg"]=$unifiedOrderResult['err_code_des'];}elseif($unifiedOrderResult[$field] != NULL){$arrMessage["resultCode"]=1;$arrMessage["resultType"]="生成订单";$arrMessage["resultMsg"]="OK";$arrMessage["resultField"] = $unifiedOrderResult[$field];}return $arrMessage;}/*** 微信回调接口返回验证签名并回应微信* @param[type] $xml [description]* @return [type][description]*/public function wxPayNotify($xml) {$notify = new Wxpay_server();$notify->saveData($xml);//验证签名,并回复微信//对后台通知交互时,如果微信收到商户的应答不是成功或者超时,微信认为通知失败//微信会通过一定的策略(如30分钟共8次),定期重新发起通知if ($notify->checkSign() == false) {$notify->setReturnParameter("return_code","FAIL");//返回状态码$notify->setReturnParameter("return_msg","签名失败");//返回信息} else {$notify->checkSign=TRUE;$notify->setReturnParameter("return_code","SUCCESS");//设置返回码}return $notify;}}/*** JSAPI支付——H5网页端调起支付接口*/class JsApi_handle extends JsApi_common {public $code;//code码,用以获取openidpublic $openid;//用户的openidpublic $parameters;//jsapi参数,格式为jsonpublic $prepay_id;//使用统一支付接口得到的预支付idpublic $curl_timeout;//curl超时时间function __construct(){//设置curl超时时间$this->curl_timeout = WxPayConf::CURL_TIMEOUT;}/*** 生成获取code的URL* @return [type] [description]*/public function createOauthUrlForCode() {//重定向URL$redirectUrl = "http://www.itcen.cn/wxpay/confirm/".$orderId."?showwxpaytitle=1";$urlParams['appid'] = WxPayConf::APPID;$urlParams['redirect_uri'] = $redirectUrl;$urlParams['response_type'] = 'code';$urlParams['scope'] = 'snsapi_base';$urlParams['state'] = "STATE"."#wechat_redirect";//拼接字符串$queryString = $this->ToUrlParams($urlParams, false);return "https://open.weixin.qq.com/connect/oauth2/authorize?".$queryString;}/*** 设置code* @param [type] $code [description]*/public function setCode($code) {$this->code = $code;}/***作用:设置prepay_id*/public function setPrepayId($prepayId){$this->prepay_id = $prepayId;}/***作用:获取jsapi的参数*/public function getParams(){$jsApiObj["appId"] = WxPayConf::APPID;$timeStamp = time();$jsApiObj["timeStamp"] = "$timeStamp";$jsApiObj["nonceStr"] = $this->createNoncestr();$jsApiObj["package"] = "prepay_id=$this->prepay_id";$jsApiObj["signType"] = "MD5";$jsApiObj["paySign"] = $this->getSign($jsApiObj);$this->parameters = json_encode($jsApiObj);return $this->parameters;}/*** 通过curl 向微信提交code 用以获取openid* @return [type] [description]*/public function getOpenId() {//创建openid 的链接$url = $this->createOauthUrlForOpenid();//初始化$ch = curl_init();curl_setopt($ch, CURL_TIMEOUT, $this->curl_timeout);curl_setopt($ch, CURL_URL, $url);curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);curl_setopt($ch, CURL_HEADER, FALSE);curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);//执行curl$res = curl_exec($ch);curl_close($ch);//取出openid$data = json_decode($res);if (isset($data['openid'])) {$this->openid = $data['openid'];} else {return null;}return $this->openid;}/*** 生成可以获取openid 的URL* @return [type] [description]*/public function createOauthUrlForOpenid() {$urlParams['appid'] = WxPayConf::APPID;$urlParams['secret'] = WxPayConf::APPSECRET;$urlParams['code'] = $this->code;$urlParams['grant_type'] = "authorization_code";$queryString = $this->ToUrlParams($urlParams, false);return "https://api.weixin.qq.com/sns/oauth2/access_token?".$queryString;}}/** * 统一下单接口类 */class UnifiedOrder_handle extends Wxpay_client_handle {public function __construct() {//设置接口链接$this->url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//设置curl超时时间$this->curl_timeout = WxPayConf::CURL_TIMEOUT;}}/** * 响应型接口基类 */class Wxpay_server_handle extends JsApi_common{public $data; //接收到的数据,类型为关联数组public $returnParams;//返回参数,类型为关联数组/*** 将微信请求的xml转换成关联数组* @param[type] $xml [description]* @return [type][description]*/public function saveData($xml) {$this->data = $this->xmlToArray($xml);}/*** 验证签名* @return [type] [description]*/public function checkSign() {$tmpData = $this->data;unset($temData['sign']);$sign = $this->getSign($tmpData);if ($this->data['sign'] == $sign) {return true;}return false;}/*** 设置返回微信的xml数据*/function setReturnParameter($parameter, $parameterValue){$this->returnParameters[$this->trimString($parameter)] = $this->trimString($parameterValue);}/*** 将xml数据返回微信*/function returnXml(){$returnXml = $this->createXml();return $returnXml;}}/** * 请求型接口的基类 */class Wxpay_client_handle extends JsApi_common{public $params; //请求参数,类型为关联数组public $response; //微信返回的响应public $result; //返回参数,类型类关联数组public $url; //接口链接public $curl_timeout; //curl超时时间/*** 设置请求参数* @param [type] $param[description]* @param [type] $paramValue [description]*/public function setParam($param, $paramValue) {$this->params[$this->tirmString($param)] = $this->trimString($paramValue);}/*** 获取结果,默认不使用证书* @return [type] [description]*/public function getResult() {$this->postxml();$this->result = $this->xmlToArray($this->response);return $this->result;}/*** post请求xml* @return [type] [description]*/public function postxml() {$xml = $this->createXml();$this->response = $this->postXmlCurl($xml, $this->curl, $this->curl_timeout);return $this->response;}public function createXml() {$this->params['appid'] = WxPayConf::APPID; //公众号ID$this->params['mch_id'] = WxPayConf::MCHID; //商户号$this->params['nonce_str'] = $this->createNoncestr();//随机字符串$this->params['sign'] = $this->getSign($this->params);//签名return $this->arrayToXml($this->params);}}/** * 所有接口的基类 */class JsApi_common {function __construct() {}public function trimString($value) {$ret = null;if (null != $value) {$ret = trim($value);if (strlen($ret) == 0) {$ret = null;}}return $ret;}/*** 产生随机字符串,不长于32位* @paraminteger $length [description]* @return [type][description]*/public function createNoncestr($length = 32) {$chars = "abcdefghijklmnopqrstuvwxyz0123456789";$str = '';for ($i = 0; $i < $length; $i++) {$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);}return $str;}/*** 格式化参数 拼接字符串,签名过程需要使用* @param [type] $urlParams[description]* @param [type] $needUrlencode [description]*/public function ToUrlParams($urlParams, $needUrlencode) {$buff = "";ksort($urlParams);foreach ($urlParams as $k => $v) {if($needUrlencode) $v = urlencode($v);$buff .= $k .'='. $v .'&';}$reqString = '';if (strlen($buff) > 0) {$reqString = substr($buff, 0, strlen($buff) - 1);}return $reqString;}/*** 生成签名* @param[type] $params [description]* @return [type][description]*/public function getSign($obj) {foreach ($obj as $k => $v) {$params[$k] = $v;}//签名步骤一:按字典序排序参数ksort($params);$str = $this->ToUrlParams($params, false);//签名步骤二:在$str后加入key$str = $str."$key=".WxPayConf::KEY;//签名步骤三:md5加密$str = md5($str);//签名步骤四:所有字符转为大写$result = strtoupper($str);return $result;}/*** array转xml* @param[type] $arr [description]* @return [type][description]*/public function arrayToXml($arr) {$xml = "<xml>";foreach ($arr as $k => $v) {if (is_numeric($val)) {$xml .= "<".$key.">".$key."</".$key.">";} else {$xml .= "<".$key."><![CDATA[".$val."]]></".$key.">";}}$xml .= "</xml>";return $xml;}/*** 将xml转为array* @param[type] $xml [description]* @return [type][description]*/public function xmlToArray($xml) {$arr = json_decode(json_encode(simplexml_load_string($xml, 'SinpleXMLElement', LIBXML_NOCDATA)), true);return $arr;}/*** 以post方式提交xml到对应的接口* @param[type]$xml[description]* @param[type]$url[description]* @paraminteger $second [description]* @return [type][description]*/public function postXmlCurl($xml, $url, $second = 30) {//初始化curl$ch = curl_init();//设置超时curl_setopt($ch, CURL_TIMEOUT, $second);curl_setopt($ch, CURL_URL, $url);//这里设置代理,如果有的话//curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');//curl_setopt($ch,CURLOPT_PROXYPORT, 8080);curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);//设置headercurl_setopt($ch, CURL_HEADER, FALSE);//要求结果为字符串且输出到屏幕上curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);//以post方式提交curl_setopt($ch, CURL_POST, TRUE);curl_setopt($ch, CURL_POSTFIELDS, $xml);//执行curl$res = curl_exec($ch);if ($res) {curl_close($ch);return $res;} else {$error = curl_errno($ch);echo "curl出错,错误码:$error"."<br>";echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";curl_close($ch);return false;}}}/** * 配置类 */class WxPayConf {//微信公众号身份的唯一标识。const APPID = 'wx654a22c6423213b7';//受理商ID,身份标识const MCHID = '10043241';const MCHNAME = 'KellyCen的博客';//商户支付密钥Key。const KEY = '0000000000000000000000000000000';//JSAPI接口中获取openidconst APPSECRET = '000000000000000000000000000';//证书路径,注意应该填写绝对路径const SSLCERT_PATH = '/home/WxPayCacert/apiclient_cert.pem';const SSLKEY_PATH = '/home/WxPayCacert/apiclient_key.pem';const SSLCA_PATH = '/home/WxPayCacert/rootca.pem';//本例程通过curl使用HTTP POST方法,此处可修改其超时时间,默认为30秒const CURL_TIMEOUT = 30;}Wxpay_model.php

Wxpay_model.php

  获取到code的URL后,将其分配到页面去,让用户去点击,用户进行点击后,就会从微信服务器获取到code,然后回调到redirect_uri所指的地址去。

  2、获取到code后,会回调到redirect_uri所指向的地址去,这里是到了/Wxpay/confirm/,看看这个confirm方法是打算干嘛的:

/*** 手机端微信支付,此处是授权获取到code时的回调地址* @param[type] $orderId 订单编号id* @return [type][description]*/public function confirm($orderId) {//先确认用户是否登录$this->ensureLogin();//通过订单编号获取订单数据$order = $this->wxpay_model->get($orderId);//验证订单是否是当前用户$this->_verifyUser($order);//取得支付所需要的订单数据$orderData = $this->returnOrderData[$orderId];//取得jsApi所需要的数据$wxJsApiData = $this->wxpay_model->wxPayJsApi($orderData);//将数据分配到模板去,在js里使用$this->smartyData['wxJsApiData'] = json_encode($wxJsApiData, JSON_UNESCAPED_UNICODE);$this->smartyData['order'] = $orderData;$this->displayView('wxpay/confirm.tpl');}

  这一步开始去取JSAPI支付接口所需要的数据了,这一步算是最主要的一步,这里还会调用统一下单接口获取到prepay_id,我们跳到

  $this->wxpay_model->wxPayJsApi($orderData) 看看:

/*** 微信jsapi点击支付* @param[type] $data [description]* @return [type][description]*/public function wxPayJsApi($data) {$jsApi = new JsApi_handle();//统一下单接口所需数据$payData = $this->returnData($data);//获取code码,用以获取openid$code = $_GET['code'];$jsApi->setCode($code);//通过code获取openid$openid = $jsApi->getOpenId();$unifiedOrderResult = null;if ($openid != null) {//取得统一下单接口返回的数据$unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);//获取订单接口状态$returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');if ($returnMessage['resultCode']) {$jsApi->setPrepayId($retuenMessage['resultField']);//取得wxjsapi接口所需要的数据$returnMessage['resultData'] = $jsApi->getParams();}return $returnMessage;}}

  这里首先是取得下单接口所需要的数据;

  接着获取到code码,通过code码获取到openid;

  然后调用统一下单接口,取得下单接口的响应数据,即prepay_id;

  最后取得微信支付JSAPI所需要的数据。

  这就是上面这个方法所要做的事情,取到数据后,会将数据分配到模板里,然后根据官方文档所给的参考格式将其放在js里,如下面的代码:

<!doctype html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><!-- Make sure that we can test against real IE8 --><meta http-equiv="X-UA-Compatible" content="IE=8" /><title></title></head><body><a href="javascript:callpay();" id="btnOrder">点击支付</a></body><script type="text/javascript">//将数据付给js变量var wxJsApiData = {$wxJsApiData};function onBridgeReady(){//格式参考官方文档 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6WeixinJSBridge.invoke('getBrandWCPayRequest',$.parseJSON(wxJsApiData.resultData),function(res){if(res.err_msg == "get_brand_wcpay_request:ok" ){window.location.href="/wxpay/paysuccess/"+{$order.sn};}});}function callpay(){if(!wxJsApiData.resultCode){alert(wxJsApiData.resultType+","+wxJsApiData.resultMsg+"!");return false;}if (typeof WeixinJSBridge == "undefined"){if( document.addEventListener ){document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);}else if (document.attachEvent){document.attachEvent('WeixinJSBridgeReady', onBridgeReady);document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);}}else{onBridgeReady();}}</script></html>

  3、此时用户只需要点击支付,就可以开始进入支付界面了,接着就是输入密码,确认,最后会提示支付成功,紧接着网站会提供一个支付成功跳转页面。类似微信文档里所提供的图片这样,这里我就直接截取文档里的案例图了:

基于H5的微信支付开发详解

  4、这里还有一步,就是微信支付系统会异步通知网站后台用户的支付结果。在获取统一下单数据时,我们指定了一个通知地址,在model里可以找到

基于H5的微信支付开发详解

  支付成功后,微信支付系统会将支付结果异步发送到此地址上/Wxpay/pay_callback/ ,我们来看一下这个方法

/*** 支付回调接口* @return [type] [description]*/public function pay_callback() {$postData = '';if (file_get_contents("php://input")) {$postData = file_get_contents("php://input");} else {return;}$payInfo = array();$notify = $this->wxpay_model->wxPayNotify($postData);if ($notify->checkSign == TRUE) {if ($notify->data['return_code'] == 'FAIL') {$payInfo['status'] = FALSE;$payInfo['msg'] = '通信出错';} elseif ($notify->data['result_code'] == 'FAIL') {$payInfo['status'] = FALSE;$payInfo['msg'] = '业务出错';} else {$payInfo['status'] = TRUE;$payInfo['msg'] = '支付成功';$payInfo['sn']=substr($notify->data['out_trade_no'],8);$payInfo['order_no'] = $notify->data['out_trade_no'];$payInfo['platform_no']=$notify->data['transaction_id'];$payInfo['attach']=$notify->data['attach'];$payInfo['fee']=$notify->data['cash_fee'];$payInfo['currency']=$notify->data['fee_type'];$payInfo['user_sign']=$notify->data['openid'];}}$returnXml = $notify->returnXml();echo $returnXml;$this->load->library('RedisCache');if($payInfo['status']){//这里要记录到日志处理(略)$this->model->order->onPaySuccess($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo);$this->redis->RedisCache->set('order:payNo:'.$payInfo['order_no'],'OK',5000);}else{//这里要记录到日志处理(略)$this->model->order->onPayFailure($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo, '订单支付失败 ['.$payInfo['msg'].']');}}

  这方法就是对支付是否成功,对网站的支付相关逻辑进行后续处理,例如假如支付失败,就需要记录日志里说明此次交易失败,或者是做某一些逻辑处理,而支付成功又该如何做处理,等等。

  这里我们就分析下这个方法 $this->wxpay_model->wxPayNotify($postData); 对异步返回的数据进行安全性校验,例如验证签名,看看model里的这个方法:

/*** 微信回调接口返回验证签名并回应微信* @param[type] $xml [description]* @return [type][description]*/public function wxPayNotify($xml) {$notify = new Wxpay_server();$notify->saveData($xml);//验证签名,并回复微信//对后台通知交互时,如果微信收到商户的应答不是成功或者超时,微信认为通知失败//微信会通过一定的策略(如30分钟共8次),定期重新发起通知if ($notify->checkSign() == false) {$notify->setReturnParameter("return_code","FAIL");//返回状态码$notify->setReturnParameter("return_msg","签名失败");//返回信息} else {$notify->checkSign=TRUE;$notify->setReturnParameter("return_code","SUCCESS");//设置返回码}return $notify;}

  如果验证通过,则就开始进行交易成功或者失败时所要做的逻辑处理了,这逻辑处理的代码我就不写了,因为每一个网站的处理方式都不一样,我这里是这样处理的,我把思路写下,方便不懂的朋友可以按着我的思路去完善后续的处理:首先是查看数据库里的订单日志表,看这笔交易之前是否已经交易过了,交易过就不用再更新数据表了,如果没交易过,就会将之前存在redis的订单数据给取出来,再将这些数据插入到订单日志表里,差不多就这样处理。

  好了,基于H5的微信支付接口开发详解就讲到这里,如果你认真理清博文里所讲解的思路,自己基本上也可以尝试开发此接口了,同时只要会了这个,你也基本上可以开发二维码支付,刷卡支付等等的支付接口。

  这里我附上此次开发中的完整代码供大家阅读:

<?phpdefined('BASEPATH') OR exit('No direct script access allowed');class Wxpay extends MY_Controller {public function __construct() {parent::__construct();$this->load->model('wxpay_model');//$this->load->model('wxpay');}public function index() {//微信支付$this->smarty['wxPayUrl'] = $this->wxpay_model->retWxPayUrl();$this->displayView('wxpay/index.tpl');}/*** 手机端微信支付,此处是授权获取到code时的回调地址* @param[type] $orderId 订单编号id* @return [type][description]*/public function confirm($orderId) {//先确认用户是否登录$this->ensureLogin();//通过订单编号获取订单数据$order = $this->wxpay_model->get($orderId);//验证订单是否是当前用户$this->_verifyUser($order);//取得支付所需要的订单数据$orderData = $this->returnOrderData[$orderId];//取得jsApi所需要的数据$wxJsApiData = $this->wxpay_model->wxPayJsApi($orderData);//将数据分配到模板去,在js里使用$this->smartyData['wxJsApiData'] = json_encode($wxJsApiData, JSON_UNESCAPED_UNICODE);$this->smartyData['order'] = $orderData;$this->displayView('wxpay/confirm.tpl');}/*** 支付回调接口* @return [type] [description]*/public function pay_callback() {$postData = '';if (file_get_contents("php://input")) {$postData = file_get_contents("php://input");} else {return;}$payInfo = array();$notify = $this->wxpay_model->wxPayNotify($postData);if ($notify->checkSign == TRUE) {if ($notify->data['return_code'] == 'FAIL') {$payInfo['status'] = FALSE;$payInfo['msg'] = '通信出错';} elseif ($notify->data['result_code'] == 'FAIL') {$payInfo['status'] = FALSE;$payInfo['msg'] = '业务出错';} else {$payInfo['status'] = TRUE;$payInfo['msg'] = '支付成功';$payInfo['sn']=substr($notify->data['out_trade_no'],8);$payInfo['order_no'] = $notify->data['out_trade_no'];$payInfo['platform_no']=$notify->data['transaction_id'];$payInfo['attach']=$notify->data['attach'];$payInfo['fee']=$notify->data['cash_fee'];$payInfo['currency']=$notify->data['fee_type'];$payInfo['user_sign']=$notify->data['openid'];}}$returnXml = $notify->returnXml();echo $returnXml;$this->load->library('RedisCache');if($payInfo['status']){//这里要记录到日志处理(略)$this->model->order->onPaySuccess($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo);$this->redis->RedisCache->set('order:payNo:'.$payInfo['order_no'],'OK',5000);}else{//这里要记录到日志处理(略)$this->model->order->onPayFailure($payInfo['sn'], $payInfo['order_no'], $payInfo['platform_no'],'', $payInfo['user_sign'], $payInfo, '订单支付失败 ['.$payInfo['msg'].']');}}/*** 返回支付所需要的数据* @param[type] $orderId 订单号* @paramstring $data订单数据,当$data数据存在时刷新$orderData缓存,因为订单号不唯一* @return [type][description]*/public function returnOrderData($orderId, $data = '') {//获取订单数据$order = $this->wxpay_model->get($orderId);if (0 === count($order)) return false;if (empty($data)) {$this->load->library('RedisCache');//取得缓存在redis的订单数据$orderData = $this->rediscache->getJson("order:orderData:".$orderId);if (empty($orderData)) {//如果redis里没有,则直接读数据库取$this->load->model('order_model');$order = $this->order_model->get($orderId);if (0 === count($order)) {return false;}$data = $order;} else {//如果redis里面有的话,直接返回数据return $orderData;}}//支付前缓存所需要的数据$orderData['id'] = $data['id'];$orderData['fee'] = $data['fee'];//支付平台需要的数据$orderData['user_id'] = $data['user_id'];$orderData['sn'] = $data['cn'];//这是唯一编号$orderData['order_no'] = substr(md5($data['sn'].$data['fee']), 8, 8).$data['sn'];$orderData['fee'] = $data['fee'];$orderData['time'] = $data['time'];$orderData['goods_name'] = $data['goods_name'];$orderData['attach'] = $data['attach'];//将数据缓存到redis里面$this->rediscache->set("order:orderData:".$orderId, $orderData, 3600*24);//做个标识缓存到redis,用以判断该订单是否已经支付了$this->rediscache->set("order:payNo:".$orderData['order_no'], "NO", 3600*24);return $orderData;}private function _verifyUser($order) {if (empty($order)) show_404();if (0 === count($order)) show_404();//判断订单表里的用户id是否是当前登录者的idif ($order['user_id'] == $this->uid) return;show_error('只能查看自己的订单');}}控制器:Wxpay.php

控制器:Wxpay.php

<?phpdefined('BASEPATH') OR exit('No direct script access allowed');class Wxpay_model extends CI_Model {public function __construct() {parent::__construct();}/*** 返回可以获得微信code的URL (用以获取openid)* @return [type] [description]*/public function retWxPayUrl() {$jsApi = new JsApi_handle();return $jsApi->createOauthUrlForCode();}/*** 微信jsapi点击支付* @param[type] $data [description]* @return [type][description]*/public function wxPayJsApi($data) {$jsApi = new JsApi_handle();//统一下单接口所需数据$payData = $this->returnData($data);//获取code码,用以获取openid$code = $_GET['code'];$jsApi->setCode($code);//通过code获取openid$openid = $jsApi->getOpenId();$unifiedOrderResult = null;if ($openid != null) {//取得统一下单接口返回的数据$unifiedOrderResult = $this->getResult($payData, 'JSAPI', $openid);//获取订单接口状态$returnMessage = $this->returnMessage($unifiedOrder, 'prepay_id');if ($returnMessage['resultCode']) {$jsApi->setPrepayId($retuenMessage['resultField']);//取得wxjsapi接口所需要的数据$returnMessage['resultData'] = $jsApi->getParams();}return $returnMessage;}}/*** 统一下单接口所需要的数据* @param[type] $data [description]* @return [type][description]*/public function returnData($data) {$payData['sn'] = $data['sn'];$payData['body'] = $data['goods_name'];$payData['out_trade_no'] = $data['order_no'];$payData['total_fee'] = $data['fee'];$payData['attach'] = $data['attach'];return $payData;}/*** 返回统一下单接口结果 (参考https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1)* @param[type] $payData[description]* @param[type] $trade_type [description]* @param[type] $openid[description]* @return [type][description]*/public function getResult($payData, $trade_type, $openid = null) {$unifiedOrder = new UnifiedOrder_handle();if ($opneid != null) {$unifiedOrder->setParam('openid', $openid);}$unifiedOrder->setParam('body', $payData['body']);//商品描述$unifiedOrder->setParam('out_trade_no', $payData['out_trade_no']); //商户订单号$unifiedOrder->setParam('total_fee', $payData['total_fee']);//总金额$unifiedOrder->setParam('attach', $payData['attach']);//附加数据$unifiedOrder->setParam('notify_url', base_url('/Wxpay/pay_callback'));//通知地址$unifiedOrder->setParam('trade_type', $trade_type); //交易类型//非必填参数,商户可根据实际情况选填//$unifiedOrder->setParam("sub_mch_id","XXXX");//子商户号//$unifiedOrder->setParam("device_info","XXXX");//设备号//$unifiedOrder->setParam("time_start","XXXX");//交易起始时间//$unifiedOrder->setParam("time_expire","XXXX");//交易结束时间//$unifiedOrder->setParam("goods_tag","XXXX");//商品标记//$unifiedOrder->setParam("product_id","XXXX");//商品IDreturn $unifiedOrder->getResult();}/*** 返回微信订单状态*/public function returnMessage($unifiedOrderResult,$field){$arrMessage=array("resultCode"=>0,"resultType"=>"获取错误","resultMsg"=>"该字段为空");if($unifiedOrderResult==null){$arrMessage["resultType"]="未获取权限";$arrMessage["resultMsg"]="请重新打开页面";}elseif ($unifiedOrderResult["return_code"] == "FAIL"){$arrMessage["resultType"]="网络错误";$arrMessage["resultMsg"]=$unifiedOrderResult['return_msg'];}elseif($unifiedOrderResult["result_code"] == "FAIL"){$arrMessage["resultType"]="订单错误";$arrMessage["resultMsg"]=$unifiedOrderResult['err_code_des'];}elseif($unifiedOrderResult[$field] != NULL){$arrMessage["resultCode"]=1;$arrMessage["resultType"]="生成订单";$arrMessage["resultMsg"]="OK";$arrMessage["resultField"] = $unifiedOrderResult[$field];}return $arrMessage;}/*** 微信回调接口返回验证签名并回应微信* @param[type] $xml [description]* @return [type][description]*/public function wxPayNotify($xml) {$notify = new Wxpay_server();$notify->saveData($xml);//验证签名,并回复微信//对后台通知交互时,如果微信收到商户的应答不是成功或者超时,微信认为通知失败//微信会通过一定的策略(如30分钟共8次),定期重新发起通知if ($notify->checkSign() == false) {$notify->setReturnParameter("return_code","FAIL");//返回状态码$notify->setReturnParameter("return_msg","签名失败");//返回信息} else {$notify->checkSign=TRUE;$notify->setReturnParameter("return_code","SUCCESS");//设置返回码}return $notify;}}/*** JSAPI支付——H5网页端调起支付接口*/class JsApi_handle extends JsApi_common {public $code;//code码,用以获取openidpublic $openid;//用户的openidpublic $parameters;//jsapi参数,格式为jsonpublic $prepay_id;//使用统一支付接口得到的预支付idpublic $curl_timeout;//curl超时时间function __construct(){//设置curl超时时间$this->curl_timeout = WxPayConf::CURL_TIMEOUT;}/*** 生成获取code的URL* @return [type] [description]*/public function createOauthUrlForCode() {//重定向URL$redirectUrl = "http://www.itcen.cn/wxpay/confirm/".$orderId."?showwxpaytitle=1";$urlParams['appid'] = WxPayConf::APPID;$urlParams['redirect_uri'] = $redirectUrl;$urlParams['response_type'] = 'code';$urlParams['scope'] = 'snsapi_base';$urlParams['state'] = "STATE"."#wechat_redirect";//拼接字符串$queryString = $this->ToUrlParams($urlParams, false);return "https://open.weixin.qq.com/connect/oauth2/authorize?".$queryString;}/*** 设置code* @param [type] $code [description]*/public function setCode($code) {$this->code = $code;}/***作用:设置prepay_id*/public function setPrepayId($prepayId){$this->prepay_id = $prepayId;}/***作用:获取jsapi的参数*/public function getParams(){$jsApiObj["appId"] = WxPayConf::APPID;$timeStamp = time();$jsApiObj["timeStamp"] = "$timeStamp";$jsApiObj["nonceStr"] = $this->createNoncestr();$jsApiObj["package"] = "prepay_id=$this->prepay_id";$jsApiObj["signType"] = "MD5";$jsApiObj["paySign"] = $this->getSign($jsApiObj);$this->parameters = json_encode($jsApiObj);return $this->parameters;}/*** 通过curl 向微信提交code 用以获取openid* @return [type] [description]*/public function getOpenId() {//创建openid 的链接$url = $this->createOauthUrlForOpenid();//初始化$ch = curl_init();curl_setopt($ch, CURL_TIMEOUT, $this->curl_timeout);curl_setopt($ch, CURL_URL, $url);curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);curl_setopt($ch, CURL_HEADER, FALSE);curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);//执行curl$res = curl_exec($ch);curl_close($ch);//取出openid$data = json_decode($res);if (isset($data['openid'])) {$this->openid = $data['openid'];} else {return null;}return $this->openid;}/*** 生成可以获取openid 的URL* @return [type] [description]*/public function createOauthUrlForOpenid() {$urlParams['appid'] = WxPayConf::APPID;$urlParams['secret'] = WxPayConf::APPSECRET;$urlParams['code'] = $this->code;$urlParams['grant_type'] = "authorization_code";$queryString = $this->ToUrlParams($urlParams, false);return "https://api.weixin.qq.com/sns/oauth2/access_token?".$queryString;}}/** * 统一下单接口类 */class UnifiedOrder_handle extends Wxpay_client_handle {public function __construct() {//设置接口链接$this->url = "https://api.mch.weixin.qq.com/pay/unifiedorder";//设置curl超时时间$this->curl_timeout = WxPayConf::CURL_TIMEOUT;}}/** * 响应型接口基类 */class Wxpay_server_handle extends JsApi_common{public $data; //接收到的数据,类型为关联数组public $returnParams;//返回参数,类型为关联数组/*** 将微信请求的xml转换成关联数组* @param[type] $xml [description]* @return [type][description]*/public function saveData($xml) {$this->data = $this->xmlToArray($xml);}/*** 验证签名* @return [type] [description]*/public function checkSign() {$tmpData = $this->data;unset($temData['sign']);$sign = $this->getSign($tmpData);if ($this->data['sign'] == $sign) {return true;}return false;}/*** 设置返回微信的xml数据*/function setReturnParameter($parameter, $parameterValue){$this->returnParameters[$this->trimString($parameter)] = $this->trimString($parameterValue);}/*** 将xml数据返回微信*/function returnXml(){$returnXml = $this->createXml();return $returnXml;}}/** * 请求型接口的基类 */class Wxpay_client_handle extends JsApi_common{public $params; //请求参数,类型为关联数组public $response; //微信返回的响应public $result; //返回参数,类型类关联数组public $url; //接口链接public $curl_timeout; //curl超时时间/*** 设置请求参数* @param [type] $param[description]* @param [type] $paramValue [description]*/public function setParam($param, $paramValue) {$this->params[$this->tirmString($param)] = $this->trimString($paramValue);}/*** 获取结果,默认不使用证书* @return [type] [description]*/public function getResult() {$this->postxml();$this->result = $this->xmlToArray($this->response);return $this->result;}/*** post请求xml* @return [type] [description]*/public function postxml() {$xml = $this->createXml();$this->response = $this->postXmlCurl($xml, $this->curl, $this->curl_timeout);return $this->response;}public function createXml() {$this->params['appid'] = WxPayConf::APPID; //公众号ID$this->params['mch_id'] = WxPayConf::MCHID; //商户号$this->params['nonce_str'] = $this->createNoncestr();//随机字符串$this->params['sign'] = $this->getSign($this->params);//签名return $this->arrayToXml($this->params);}}/** * 所有接口的基类 */class JsApi_common {function __construct() {}public function trimString($value) {$ret = null;if (null != $value) {$ret = trim($value);if (strlen($ret) == 0) {$ret = null;}}return $ret;}/*** 产生随机字符串,不长于32位* @paraminteger $length [description]* @return [type][description]*/public function createNoncestr($length = 32) {$chars = "abcdefghijklmnopqrstuvwxyz0123456789";$str = '';for ($i = 0; $i < $length; $i++) {$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);}return $str;}/*** 格式化参数 拼接字符串,签名过程需要使用* @param [type] $urlParams[description]* @param [type] $needUrlencode [description]*/public function ToUrlParams($urlParams, $needUrlencode) {$buff = "";ksort($urlParams);foreach ($urlParams as $k => $v) {if($needUrlencode) $v = urlencode($v);$buff .= $k .'='. $v .'&';}$reqString = '';if (strlen($buff) > 0) {$reqString = substr($buff, 0, strlen($buff) - 1);}return $reqString;}/*** 生成签名* @param[type] $params [description]* @return [type][description]*/public function getSign($obj) {foreach ($obj as $k => $v) {$params[$k] = $v;}//签名步骤一:按字典序排序参数ksort($params);$str = $this->ToUrlParams($params, false);//签名步骤二:在$str后加入key$str = $str."$key=".WxPayConf::KEY;//签名步骤三:md5加密$str = md5($str);//签名步骤四:所有字符转为大写$result = strtoupper($str);return $result;}/*** array转xml* @param[type] $arr [description]* @return [type][description]*/public function arrayToXml($arr) {$xml = "<xml>";foreach ($arr as $k => $v) {if (is_numeric($val)) {$xml .= "<".$key.">".$key."</".$key.">";} else {$xml .= "<".$key."><![CDATA[".$val."]]></".$key.">";}}$xml .= "</xml>";return $xml;}/*** 将xml转为array* @param[type] $xml [description]* @return [type][description]*/public function xmlToArray($xml) {$arr = json_decode(json_encode(simplexml_load_string($xml, 'SinpleXMLElement', LIBXML_NOCDATA)), true);return $arr;}/*** 以post方式提交xml到对应的接口* @param[type]$xml[description]* @param[type]$url[description]* @paraminteger $second [description]* @return [type][description]*/public function postXmlCurl($xml, $url, $second = 30) {//初始化curl$ch = curl_init();//设置超时curl_setopt($ch, CURL_TIMEOUT, $second);curl_setopt($ch, CURL_URL, $url);//这里设置代理,如果有的话//curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');//curl_setopt($ch,CURLOPT_PROXYPORT, 8080);curl_setopt($ch, CURL_SSL_VERIFYHOST, FALSE);curl_setopt($ch, CURL_SSL_VERIFYPEER, FALSE);//设置headercurl_setopt($ch, CURL_HEADER, FALSE);//要求结果为字符串且输出到屏幕上curl_setopt($ch, CURL_RETURNTRANSFER, TRUE);//以post方式提交curl_setopt($ch, CURL_POST, TRUE);curl_setopt($ch, CURL_POSTFIELDS, $xml);//执行curl$res = curl_exec($ch);if ($res) {curl_close($ch);return $res;} else {$error = curl_errno($ch);echo "curl出错,错误码:$error"."<br>";echo "<a href='http://curl.haxx.se/libcurl/c/libcurl-errors.html'>错误原因查询</a></br>";curl_close($ch);return false;}}}/** * 配置类 */class WxPayConf {//微信公众号身份的唯一标识。const APPID = 'wx654a22c6423213b7';//受理商ID,身份标识const MCHID = '10043241';const MCHNAME = 'KellyCen的博客';//商户支付密钥Key。const KEY = '0000000000000000000000000000000';//JSAPI接口中获取openidconst APPSECRET = '000000000000000000000000000';//证书路径,注意应该填写绝对路径const SSLCERT_PATH = '/home/WxPayCacert/apiclient_cert.pem';const SSLKEY_PATH = '/home/WxPayCacert/apiclient_key.pem';const SSLCA_PATH = '/home/WxPayCacert/rootca.pem';//本例程通过curl使用HTTP POST方法,此处可修改其超时时间,默认为30秒const CURL_TIMEOUT = 30;}模型:Wxpay_model.php <!doctype html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><!-- Make sure that we can test against real IE8 --><meta http-equiv="X-UA-Compatible" content="IE=8" /><title></title></head><body><a href="{$wxPayUrl}">微信支付</a></body></html>视图:index.tpl <!doctype html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><!-- Make sure that we can test against real IE8 --><meta http-equiv="X-UA-Compatible" content="IE=8" /><title></title></head><body><a href="javascript:callpay();" id="btnOrder">点击支付</a></body><script type="text/javascript">//将数据付给js变量var wxJsApiData = {$wxJsApiData};function onBridgeReady(){//格式参考官方文档 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6WeixinJSBridge.invoke('getBrandWCPayRequest',$.parseJSON(wxJsApiData.resultData),function(res){if(res.err_msg == "get_brand_wcpay_request:ok" ){window.location.href="/wxpay/paysuccess/"+{$order.sn};}});}function callpay(){if(!wxJsApiData.resultCode){alert(wxJsApiData.resultType+","+wxJsApiData.resultMsg+"!");return false;}if (typeof WeixinJSBridge == "undefined"){if( document.addEventListener ){document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);}else if (document.attachEvent){document.attachEvent('WeixinJSBridgeReady', onBridgeReady);document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);}}else{onBridgeReady();}}</script></html>视图:confirm.tpl

里面所用到的一些自定义函数可以在我上一篇博文里找找,那里已经提供了代码参考了。

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