<?php
namespace Potting;

class WechatPay
{
private static $mchid='';
private static $appid='';
private static $key='';
//生成微信APP预支付信息
public static function createJsBizPackage($totalFee, $outTradeNo, $orderName, $notifyUrl.$timestamp){
$unified = array(
'appid' => self::$appid,
'attach' => '支付',
'body' => $orderName,
'mch_id' => self::$mchid,
'nonce_str' => self::createNonceStr(),
'notify_url' => $notifyUrl,
'out_trade_no' => $outTradeNo,
'spbill_create_ip' => '127.0.0.1',
'total_fee' => intval($totalFee * 100),
'trade_type' => 'APP',
);
$unified['sign'] = self::getSign($unified);
$responseXml = self::curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', self::arrayToXml($unified));
$unifiedOrder = (array)simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
if ($unifiedOrder === false) {
die('parse xml error');
}
if ($unifiedOrder['return_code'] != 'SUCCESS') {
die($unifiedOrder['return_msg']);
}
if ($unifiedOrder['result_code'] != 'SUCCESS') {
die($unifiedOrder['err_code']);
}
$arr = array(
"appid" => self::$appid,
'partnerid'=>self::$mchid,
"timestamp" => $timestamp,
"noncestr" => $unifiedOrder['nonce_str'],
"package" => 'Sign=WXPay',
"prepayid"=>$unifiedOrder['prepay_id'],
);
$data['paySign'] = self::getSign($arr);
$data['appId']=self::$appid;
$data['timeStamp']=$timestamp;
$data['nonceStr']=$unifiedOrder['nonce_str'];
$data['prepay_id']=$unifiedOrder['prepay_id'];
$data['trade_type']=$unifiedOrder['trade_type'];
$data['mchid']=self::$mchid;
return $data;
}
//生成微信JSAPI预支付信息
public static function createJsBizPackage($openid, $totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp){
$unified = array(
'appid' => self::$appid,
'attach' => $orderName,
'body' => $orderName,
'mch_id' => self::$mchid,
'nonce_str' => self::createNonceStr(),
'notify_url' => $notifyUrl,
'openid' => $openid,
'out_trade_no' => $outTradeNo,
'spbill_create_ip' => '127.0.0.1',
'total_fee' => intval($totalFee * 100),
'trade_type' => 'JSAPI',
);
$unified['sign'] = self::getSign($unified, self::$key);
$responseXml = self::curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', self::arrayToXml($unified));
$unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
if ($unifiedOrder === false) {
die('parse xml error');
}
if ($unifiedOrder->return_code != 'SUCCESS') {
die($unifiedOrder->return_msg);
}
if ($unifiedOrder->result_code != 'SUCCESS') {
die($unifiedOrder->err_code_des);
}
$arr = array(
"appId" => self::$appid,
"timeStamp" => $timestamp,
"nonceStr" => self::createNonceStr(),
"package" => "prepay_id=" . $unifiedOrder->prepay_id,
"signType" => 'MD5',
);
$arr['paySign'] = self::getSign($arr, self::$key);
return $arr;
}

//微信支付回调
public static function actionNotify($postStr){
    $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
    if ($postObj === false) {
        die('parse xml error');
    }
    if ($postObj->return_code != 'SUCCESS') {
        die($postObj->return_msg);
    }
    if ($postObj->result_code != 'SUCCESS') {
        die($postObj->err_code);
    }
    //验证签名
    $arr = (array)$postObj;
    unset($arr['sign']);
    if (self::getSign($arr,self::$key) != $postObj->sign) {
        die("签名错误");
    }

    //支付处理正确-判断是否已处理过支付状态
    //$orders = Order::find()->where(['uid'=>$postObj->openid, 'oid'=>$postObj->out_trade_no, 'status' => 0])->all();
    // if(count($orders) > 0){
    //     //更新订单状态
    //     foreach ($orders as $order) {
    //         //更新订单
    //         $order['status'] = 1;
    //         $order->update();
    //     }
    //     return '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
    // } else {
    //     //订单状态已更新，直接返回
    //     return '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
    // }
}

public static function curlGet($url = '', $options = array()){
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    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;
}


public static 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;
}

public static function createNonceStr($length = 16){
    $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    $str = '';
    for ($i = 0; $i<$length; $i++){
        $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
}

public static function arrayToXml($arr){
    $xml = "<xml>";
    foreach ($arr as $key => $val){
        if (is_numeric($val)) {
            $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
        } else {
            $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
        }
    }
    $xml .= "</xml>";
    return $xml;
}

public static function getSign($params){
    ksort($params, SORT_STRING);
    $unSignParaString = self::formatQueryParaMap($params, false);
    $signStr = strtoupper(md5($unSignParaString . "&key=" . self::$key));
    return $signStr;
}

protected static function formatQueryParaMap($paraMap, $urlEncode = false){
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v){
        if (null != $v && "null" != $v) {
            if ($urlEncode) {
                $v = urlencode($v);
            }
            $buff .= $k . "=" . $v . "&";
        }
    }
    $reqPar = '';
    if (strlen($buff)>0) {
        $reqPar = substr($buff, 0, strlen($buff) - 1);
    }
    return $reqPar;
}

}