PHP接入支付宝支付及回调（当面付）

本文引用于  猫玖云  https://blog.csdn.net/qq_63573498

一、项目介绍

两个文件实现PHP接入支付宝当面付功能，包括发起支付和支付回调应答

注意：

1. notify.php仅需要填写支付宝公钥以及支付成功后的相关逻辑即可
2. NotifySerice类中的内容无需修改
3. 务必在支付宝官方添加IP白名单
4. 支付宝当面付还会有一个同步回调，这里没有研究
5. 支付宝需要用到的参数只有公钥、私钥、appid，并且申请难度比微信要低

二、准备资料

1、appid

1.1 私钥

1.2 公钥

2、在支付宝官方开启IP白名单

三、支付代码

1、index.php

注意：

1.1 index.php中的支付成功通知地址需要用https协议，该文件内容，下面会给出

1.2 务必在支付宝官方开启IP白名单

1.3 仅需要补充或修改IndexService类上边的内容即可，IndexService类中不需修改

<?php
//支付配置
$appid = '';         //APPID
$rsaPrivateKey= '';  //私钥
 
//默认配置
$notifyUrl = 'https://***/notify.php';     //付款成功后的异步回调地址
$outTradeNo = date("YmdHis").uniqid();     //商品订单号
 
//取商品名称和金额
$payAmount = '';          //付款金额，单位:元
$orderName = '';          //订单标题
 
//发起支付
$aliPay = new IndexService();
$aliPay->setAppid($appid);
$aliPay->setNotifyUrl($notifyUrl);
$aliPay->setRsaPrivateKey($rsaPrivateKey);
$aliPay->setTotalFee($payAmount);
$aliPay->setOutTradeNo($outTradeNo);
$aliPay->setOrderName($orderName);
$result = $aliPay->doPay();
$result = $result['alipay_trade_precreate_response'];
if($result['code']=='10000'){
    $url = 'https://wenhairu.com/static/api/qr/?size=300&text='.$result['qr_code'];
    echo "<img src='{$url}' style='width:300px;'><br>";
    echo '二维码内容：'.$result['qr_code'];
}
 
 
//IndexService类
class IndexService
{
    protected $appId;
    protected $notifyUrl;
    protected $charset;
    //私钥值
    protected $rsaPrivateKey;
    protected $totalFee;
    protected $outTradeNo;
    protected $orderName;
 
    public function __construct()
    {
        $this->charset = 'utf-8';
    }
 
    public function setAppid($appid)
    {
        $this->appId = $appid;
    }
 
    public function setNotifyUrl($notifyUrl)
    {
        $this->notifyUrl = $notifyUrl;
    }
 
    public function setRsaPrivateKey($saPrivateKey)
    {
        $this->rsaPrivateKey = $saPrivateKey;
    }
 
    public function setTotalFee($payAmount)
    {
        $this->totalFee = $payAmount;
    }
 
    public function setOutTradeNo($outTradeNo)
    {
        $this->outTradeNo = $outTradeNo;
    }
 
    public function setOrderName($orderName)
    {
        $this->orderName = $orderName;
    }
 
    /**
     * 发起订单
     * @return array
     */
    public function doPay(): array
    {
        //请求参数
        $requestConfigs = array(
            'out_trade_no'=>$this->outTradeNo,
            'total_amount'=>$this->totalFee, //单位 元
            'subject'=>$this->orderName,  //订单标题
            'timeout_express'=>'2h'       //该笔订单允许的最晚付款时间，逾期将关闭交易。取值范围：1m～15d。m-分钟，h-小时，d-天，1c-当天（1c-当天的情况下，无论交易何时创建，都在0点关闭）。 该参数数值不接受小数点， 如 1.5h，可转换为 90m。
        );
        $commonConfigs = array(
            //公共参数
            'app_id' => $this->appId,
            'method' => 'alipay.trade.precreate',             //接口名称
            'format' => 'JSON',
            'charset'=>$this->charset,
            'sign_type'=>'RSA2',
            'timestamp'=>date('Y-m-d H:i:s'),
            'version'=>'1.0',
            'notify_url' => $this->notifyUrl,
            'biz_content'=>json_encode($requestConfigs),
        );
        $commonConfigs["sign"] = $this->generateSign($commonConfigs, $commonConfigs['sign_type']);
        $result = $this->curlPost('https://openapi.alipay.com/gateway.do?charset='.$this->charset,$commonConfigs);
        return json_decode($result,true);
    }
    public function generateSign($params, $signType = "RSA"): ?string
    {
        return $this->sign($this->getSignContent($params), $signType);
    }
    protected function sign($data, $signType = "RSA") {
        $priKey=$this->rsaPrivateKey;
        $res = "-----BEGIN RSA PRIVATE KEY-----\n" .
            wordwrap($priKey, 64, "\n", true) .
            "\n-----END RSA PRIVATE KEY-----";
        ($res) or die('您使用的私钥格式错误，请检查RSA私钥配置');
        if ("RSA2" == $signType) {
            openssl_sign($data, $sign, $res, version_compare(PHP_VERSION,'5.4.0', '<') ? SHA256 : OPENSSL_ALGO_SHA256); //OPENSSL_ALGO_SHA256是php5.4.8以上版本才支持
        } else {
            openssl_sign($data, $sign, $res);
        }
        $sign = base64_encode($sign);
        return $sign;
    }
    /**
     * 校验$value是否非空
     *  if not set ,return true;
     *    if is null , return true;
     **/
    protected function checkEmpty($value): bool
    {
        if (!isset($value))
            return true;
        if (trim($value) === "")
            return true;
        return false;
    }
    public function getSignContent($params): string
    {
        ksort($params);
        $stringToBeSigned = "";
        $i = 0;
        foreach ($params as $k => $v) {
            if (false === $this->checkEmpty($v) && "@" != substr($v, 0, 1)) {
                // 转换成目标字符集
                $v = $this->characet($v, $this->charset);
                if ($i == 0) {
                    $stringToBeSigned .= "$k" . "=" . "$v";
                } else {
                    $stringToBeSigned .= "&" . "$k" . "=" . "$v";
                }
                $i++;
            }
        }
        unset ($k, $v);
        return $stringToBeSigned;
    }
    /**
     * 转换字符集编码
     * @param $data
     * @param $targetCharset
     * @return string
     */
    function characet($data, $targetCharset) {
        if (!empty($data)) {
            $fileType = $this->charset;
            if (strcasecmp($fileType, $targetCharset) != 0) {
                $data = mb_convert_encoding($data, $targetCharset, $fileType);
                //$data = iconv($fileType, $targetCharset.'//IGNORE', $data);
            }
        }
        return $data;
    }
    public function curlPost($url = '', $postData = '', $options = array())
    {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
        if (!empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);
        return $data;
    }
 
}

 2、notify.php

<?php
$alipayPublicKey = ''; //支付宝公钥
 
$aliPay = new NotifyService($alipayPublicKey);
//验证签名
$result = $aliPay->rsaCheck($_POST);
if($result===true && $_POST['trade_status'] == 'TRADE_SUCCESS'){
 
 
  //这里填写支付成功的相关业务逻辑，可能需要用到的以下参数
 
  //商家订单号 $_POST['out_trade_no']
  //订单金额 $_POST['total_amount']
 
  //告诉支付宝，我已经处理好了
   echo 'success';exit();
}
echo 'error';exit();
 
 
//NotifyService类
class NotifyService
{
    //支付宝公钥
    protected $alipayPublicKey;
    protected $charset;
 
    public function __construct($alipayPublicKey)
    {
        $this->charset = 'utf8';
        $this->alipayPublicKey=$alipayPublicKey;
    }
 
    /**
     *  验证签名
     **/
    public function rsaCheck($params): ?bool
    {
        $sign = $params['sign'];
        $signType = $params['sign_type'];
        unset($params['sign_type']);
        unset($params['sign']);
        return $this->verify($this->getSignContent($params), $sign, $signType);
    }
 
    function verify($data, $sign, $signType = 'RSA') {
        $pubKey= $this->alipayPublicKey;
        $res = "-----BEGIN PUBLIC KEY-----\n" .
            wordwrap($pubKey, 64, "\n", true) .
            "\n-----END PUBLIC KEY-----";
        ($res) or die('支付宝RSA公钥错误。请检查公钥文件格式是否正确');
 
        //调用openssl内置方法验签，返回bool值
        if ("RSA2" == $signType) {
            $result = (bool)openssl_verify($data, base64_decode($sign), $res, version_compare(PHP_VERSION,'5.4.0', '<') ? SHA256 : OPENSSL_ALGO_SHA256);
        } else {
            $result = (bool)openssl_verify($data, base64_decode($sign), $res);
        }
//        if(!$this->checkEmpty($this->alipayPublicKey)) {
//            //释放资源
//            openssl_free_key($res);
//        }
        return $result;
    }
 
    /**
     * 校验$value是否非空
     *  if not set ,return true;
     *    if is null , return true;
     **/
    protected function checkEmpty($value): bool
    {
        if (!isset($value))
            return true;
        if (trim($value) === "")
            return true;
        return false;
    }
 
    public function getSignContent($params): string
    {
        ksort($params);
        $stringToBeSigned = "";
        $i = 0;
        foreach ($params as $k => $v) {
            if (false === $this->checkEmpty($v) && "@" != substr($v, 0, 1)) {
                // 转换成目标字符集
                $v = $this->characet($v, $this->charset);
                if ($i == 0) {
                    $stringToBeSigned .= "$k" . "=" . "$v";
                } else {
                    $stringToBeSigned .= "&" . "$k" . "=" . "$v";
                }
                $i++;
            }
        }
        unset ($k, $v);
        return $stringToBeSigned;
    }
 
    /**
     * 转换字符集编码
     * @param $data
     * @param $targetCharset
     * @return string
     */
    function characet($data, $targetCharset): string
    {
        if (!empty($data)) {
            $fileType = $this->charset;
            if (strcasecmp($fileType, $targetCharset) != 0) {
                $data = mb_convert_encoding($data, $targetCharset, $fileType);
                //$data = iconv($fileType, $targetCharset.'//IGNORE', $data);
            }
        }
        return $data;
    }
}