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。

  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)。

  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:

defined('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:

  

defined('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ID

return $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openid

public $openid;//用户的openid

public $parameters;//jsapi参数,格式为json

public $prepay_id;//使用统一支付接口得到的预支付id

public $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

* @param integer $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 = "";

foreach ($arr as $k => $v) {

if (is_numeric($val)) {

$xml .= "<".$key.">".$key."";

} else {

$xml .= "<".$key.">";

}

}

$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]

* @param integer $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header

curl_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"."
";

echo "错误原因查询
";

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openid

const 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:

点击支付

  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:

  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

  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:

defined('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

* @param string $data 订单数据,当$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id

if ($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

defined('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ID

return $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openid

public $openid;//用户的openid

public $parameters;//jsapi参数,格式为json

public $prepay_id;//使用统一支付接口得到的预支付id

public $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

* @param integer $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 = "";

foreach ($arr as $k => $v) {

if (is_numeric($val)) {

$xml .= "<".$key.">".$key."";

} else {

$xml .= "<".$key.">";

}

}

$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]

* @param integer $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header

curl_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"."
";

echo "错误原因查询
";

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openid

const 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

模型:Wxpay_model.php

微信支付

视图:index.tpl

视图:index.tpl

点击支付

视图:confirm.tpl

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。

  

转自:https://www.cnblogs.com/it-cen/p/4950186.html

 

参考阅读

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