<?php
namespace api\libs;

class WxPayHelper{


    /*
    配置参数
    */
    public static $config = array(
        'appid' => "wx197398b311bf2690",    /*微信开放平台上的应用id*/
        'mch_id' => "1497400492",   /*微信申请成功之后邮件中的商户id*/
        'api_key' => "ZXWLzhixiaowulianZXWLzhixiao1702",    /*在微信商户平台上自己设定的api密钥 32位*/
        'notify_url' => 'http://api.charging.lmlm.cn/v1/notify/index', /*自定义的回调程序地址id*/
//        'SSLCERT_PATH'=>'../lib/cert/apiclient_cert.pem',
//        'SSLKEY_PATH'=>'../lib/cert/apiclient_key.pem',

    );

    //获取预支付订单
    public static  function getPrePayOrder($body, $out_trade_no, $total_fee,$openid){

        $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
        $notify_url = self::$config['notify_url'];
        $onoce_str = self::getRandChar(32);
        $data["appid"] = self::$config["appid"];
        $data["body"] = $body;
        $data["mch_id"] = self::$config['mch_id'];
        $data["nonce_str"] = $onoce_str;
        $data["notify_url"] = $notify_url;
        $data["out_trade_no"] = $out_trade_no;
        $data["spbill_create_ip"] = self::get_client_ip();
        $data["total_fee"] = $total_fee;
        $data["trade_type"] = "JSAPI";//小程序取值“JSAPI”
        $data["openid"] = $openid;
        $s = self::getSign($data, false);
        $data["sign"] = $s;

        $xml = self::arrayToXml($data);
        if($xml ===false){
            return false;
        }

        $response = self::postXmlCurl($xml, $url);
        if(!$response){
            return false;
        }

        return self::xmlstr_to_array($response);
    }

    //执行第二次签名，才能返回给客户端使用
    public static  function getOrder($prepayId){
        $data["appid"] = self::$config["appid"];
        $data["noncestr"] = self::getRandChar(32);;
        $data["package"] = "Sign=WXPay";
        $data["partnerid"] = self::$config['mch_id'];
        $data["prepayid"] = $prepayId;
        $data["timestamp"] = time();
        $s = self::getSign($data, false);
        $data["sign"] = $s;
        return $data;
    }

    /*
        生成签名
    */
    public static  function getSign($arr)
    {
        foreach ($arr as $k => $v)
        {
            $Parameters[strtolower($k)] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $string = self::ToUrlParams($Parameters);
        //签名步骤二：在string后加入KEY
        $string = $string."&key=".self::$config['api_key'];
        //签名步骤三：MD5加密
        $string = md5($string);
        //签名步骤四：所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }

    /**
     * 小程序支付签名
     * @param $arr
     * @return string
     */
    public static  function appletSign($arr)
    {
        foreach ($arr as $k => $v)
        {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $string = self::ToUrlParams($Parameters);
        //签名步骤二：在string后加入KEY
        $string = $string."&key=".self::$config['api_key'];
        //签名步骤三：MD5加密
        $string = md5($string);
        //签名步骤四：所有字符转为大写
        $result = strtoupper($string);
        return $result;
    }

    //获取指定长度的随机字符串
    public static  function getRandChar($length){
        $str = null;
        $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
        $max = strlen($strPol)-1;

        for($i=0;$i<$length;$i++){
            $str.=$strPol[rand(0,$max)];//rand($min,$max)生成介于min和max两个数之间的一个随机整数
        }

        return $str;
    }

    //数组转xml
    public static  function arrayToXml($arr){
        if(!is_array($arr) || count($arr) <=0){
            return false;
        }

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

        }
        $xml.="</xml>";
        return $xml;
    }

    //post https请求，CURLOPT_POSTFIELDS xml格式
    public static  function postXmlCurl($xml,$url,$useCert=false,$second=30)
    {
        //初始化curl
        $ch = curl_init();
        //超时时间
        curl_setopt($ch,CURLOPT_TIMEOUT,$second);
        //这里设置代理，如果有的话
        //curl_setopt($ch,CURLOPT_PROXY, '8.8.8.8');
        //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
        curl_setopt($ch,CURLOPT_URL, $url);
        curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,TRUE);
        curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);//严格校验
        //设置header
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        //要求结果为字符串且输出到屏幕上
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        if($useCert == true){
            //设置证书
            //使用证书：cert 与 key 分别属于两个.pem文件
            curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
            curl_setopt($ch,CURLOPT_SSLCERT, self::$config['SSLCERT_PATH']);
            curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
            curl_setopt($ch,CURLOPT_SSLKEY, self::$config['SSLKEY_PATH']);
        }

        //post提交方式
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
        //运行curl
        $data = curl_exec($ch);
        //返回结果
        if($data)
        {
            curl_close($ch);
            return $data;
        }
        else
        {
            $error = curl_error($ch);
            //var_dump($error);die;
            curl_close($ch);
            return false;
        }
    }

    /*
        获取当前服务器的IP
    */
    public static  function get_client_ip()
    {
        if ($_SERVER['REMOTE_ADDR']) {
            $cip = $_SERVER['REMOTE_ADDR'];
        } elseif (getenv("REMOTE_ADDR")) {
            $cip = getenv("REMOTE_ADDR");
        } elseif (getenv("HTTP_CLIENT_IP")) {
            $cip = getenv("HTTP_CLIENT_IP");
        } else {
            $cip = "unknown";
        }
        return $cip;
    }

    //将数组转成uri字符串
    public static function formatBizQueryParaMap($paraMap, $urlencode)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v)
        {
            if($urlencode)
            {
                $v = urlencode($v);
            }
            $buff .= strtolower($k) . "=" . $v . "&";
        }
        //$reqPar;
        if (strlen($buff) > 0)
        {
            $reqPar = substr($buff, 0, strlen($buff)-1);
        }
        return $reqPar;
    }

    /**
     * 格式化参数格式化成url参数
     */
    public static  function ToUrlParams($paraMap)
    {
        $buff = "";
        foreach ($paraMap as $k => $v)
        {
            if($k != "sign" && $v != "" && !is_array($v)){
                $buff .= $k . "=" . $v . "&";
            }
        }

        $buff = trim($buff, "&");
        return $buff;
    }

    /**
    xml转成数组
     */
    public static  function xmlstr_to_array($xmlstr) {
        $doc = new \DOMDocument();
        $doc->loadXML($xmlstr);
        return self::domnode_to_array($doc->documentElement);
    }


    public  static function domnode_to_array($node) {
        $output = array();
        switch ($node->nodeType) {
            case XML_CDATA_SECTION_NODE:
            case XML_TEXT_NODE:
                $output = trim($node->textContent);
                break;
            case XML_ELEMENT_NODE:
                for ($i=0, $m=$node->childNodes->length; $i<$m; $i++) {
                    $child = $node->childNodes->item($i);
                    $v =self::domnode_to_array($child);
                    if(isset($child->tagName)) {
                        $t = $child->tagName;
                        if(!isset($output[$t])) {
                            $output[$t] = array();
                        }
                        $output[$t][] = $v;
                    }
                    elseif($v) {
                        $output = (string) $v;
                    }
                }
                if(is_array($output)) {
                    if($node->attributes->length) {
                        $a = array();
                        foreach($node->attributes as $attrName => $attrNode) {
                            $a[$attrName] = (string) $attrNode->value;
                        }
                        $output['@attributes'] = $a;
                    }
                    foreach ($output as $t => $v) {
                        if(is_array($v) && count($v)==1 && $t!='@attributes') {
                            $output[$t] = $v[0];
                        }
                    }
                }
                break;
        }
        return $output;
    }

    /**
     * 获取订单号
     */
    public static function getOrderNum($info = 'charging'){
        return $info.time().mt_rand(100000,999999);
    }


}

?>