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/**
 * 創(chuàng)建訂單
 *
 * @return void
 */
public function create()
 {
    $order = new OrderModel();
    $order['title'] = $title.'-'.date('Ymd');
    $order['out_trade_no'] = WxPayConfig::MCHID.time();
    $order['amount'] = $amount;
    $order['status'] = 0;
    if ($order->save()) {
        return json_encode(['error' => 0, 'msg' => '創(chuàng)建成功']);
    }
    return json_encode(['error' => 1026, 'msg' => '創(chuàng)建失敗']);
}

app.requestData('Wxpay/sign', { id: id, openid: openid }, 'GET', function (res) {
  if (res.error) {
    app.showToast(res.msg, 'success', 2000)
  } else {
    wx.requestPayment({
      timeStamp: res.result.timeStamp,
      nonceStr: res.result.nonceStr,
      package: res.result.package,
      signType: res.result.signType,
      paySign: res.result.paySign,
      'success': function (res) { },
      'fail': function (res) { },
      'complete': function (res) { }
    })
  }
}, function (res) {
  app.showToast(res.errMsg, 'success', 2000)
})

<?php
 
namespace appapicontroller;
 
use thinkLoader;
 
use appapicontrollerBase;
 
use appcommonmodelOrder as OrderModel;
 
Loader::import('wxpay/WxPay', EXTEND_PATH, '.Api.php');

class Wxpay extends Base
{
    public $data = null;
    private $curl_timeout = 3000;

    /**
     * 獲取支付參數(shù)
     *
     * @return void
     */
    public function sign()
    {
        $id = input('?get.id') ? trim(input('get.id')) : 0;
        $openid = input('?get.openid') ? trim(input('get.openid')) : 0;
        if (!$openid) {
            return json_encode(['error' => 4001, 'msg' => '用戶參數(shù)錯(cuò)誤']);
        }
        $order = OrderModel::get($id);
        if (!$order) {
            return json_encode(['error' => 4002, 'msg' => '訂單不存在']);
        }
        // 統(tǒng)一下單
        $input = new WxPayUnifiedOrder();
        $input->SetBody($order->title);
        $input->SetAttach($order->id);
        $input->SetOut_trade_no($order->out_trade_no);
        $input->SetTotal_fee(floatval($order->amount) * 100);  // 單位為分
        $input->SetTime_start(date("YmdHis"));
        $input->SetTime_expire(date("YmdHis", time() + 600));
        $input->SetGoods_tag("wx-app");
        $input->SetNotify_url(config('wxpay.pay_notify_url'));
        $input->SetTrade_type("JSAPI");
        $input->SetOpenid($openid);
        $order = WxPayApi::unifiedOrder($input);

        $jsApiParameters = $this->GetJsApiParameters($order);
        if ($jsApiParameters) {
            return json_encode(['error' => 0, 'msg' => '支付參數(shù)', 'result' => json_decode($jsApiParameters)]);
        }
        return json_encode(['error' => 4001, 'msg' => '參數(shù)錯(cuò)誤']);
    }
}

/**
 * 
 * 獲取jsapi支付的參數(shù)
 * @param array $UnifiedOrderResult 統(tǒng)一支付接口返回的數(shù)據(jù)
 * @throws WxPayException
 * 
 * @return json數(shù)據(jù)，可直接填入js函數(shù)作為參數(shù)
 */
private function GetJsApiParameters($UnifiedOrderResult)
{
    if (!array_key_exists("appid", $UnifiedOrderResult)
        || !array_key_exists("prepay_id", $UnifiedOrderResult)
        || $UnifiedOrderResult['prepay_id'] == "") 
    {
        return null;
    }
    $jsapi = new WxPayJsApiPay();
    $jsapi->SetAppid($UnifiedOrderResult["appid"]);
    $timeStamp = time();
    $jsapi->SetTimeStamp("$timeStamp");
    $jsapi->SetNonceStr(WxPayApi::getNonceStr());
    $jsapi->SetPackage("prepay_id=" . $UnifiedOrderResult['prepay_id']);
    $jsapi->SetSignType("MD5");
    $jsapi->SetPaySign($jsapi->MakeSign());
    $parameters = json_encode($jsapi->GetValues());
    return $parameters;
}

/**
 * 微信支付回調(diào)
 *
 * @return void
 */
public function callback()
{
    $xml = file_get_contents("php://input");
    $data = WxPayResults::Init($xml);
    if (!array_key_exists("transaction_id", $data)) {
        return $this->toXML(['return_code' => 'FAIL', 'return_msg' => '參數(shù)錯(cuò)誤']);
    }
    //查詢訂單，判斷訂單真實(shí)性
    if (!$data["out_trade_no"] || !$this->Queryorder($data["transaction_id"])) {
        return $this->toXML(['return_code' => 'FAIL', 'return_msg' => '訂單真實(shí)性存疑']);
    }
    $order = OrderModel::where(['out_trade_no' => $data["out_trade_no"]])->find();
    if (!$order) {
        return $this->toXML(['return_code' => 'FAIL', 'return_msg' => '訂單不存在']);
    }

    $order->status = 1;
    if ($order->save()) {
        return $this->toXML(['return_code' => 'SUCCESS', 'return_msg' => 'OK']);
    }
    return $this->toXML(['return_code' => 'FAIL', 'return_msg' => '回調(diào)失敗']);
}

/**
 * 查詢訂單
 *
 * @param [type] $transaction_id
 * @return void
 */
private function Queryorder($transaction_id)
{
    $input = new WxPayOrderQuery();
    $input->SetTransaction_id($transaction_id);
    $result = WxPayApi::orderQuery($input);
    if(array_key_exists("return_code", $result)
        && array_key_exists("result_code", $result)
        && $result["return_code"] == "SUCCESS"
        && $result["result_code"] == "SUCCESS")
    {
        return true;
    }
    return false;
}

/**
 * array轉(zhuǎn)xml
 *
 * @param [type] $value
 * @return void
 */
public function toXML($values)
{
    if(!is_array($values) || count($values) <= 0) {
        return "<xml></xml>";
    }

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

//調(diào)用登錄接口
wx.login({
  success: function (res) {
    if (res.code) {
      if (!wx.getStorageSync('openid')) {
        that.requestData('Wxpay/openid', {
          code: res.code
        }, 'GET', function (res) {
          if (res.error) {
            that.showToast(res.msg, 'success', 2000)
          } else {
            wx.setStorageSync('openid', res.result)
          }
        })
      }
    } else {
      that.showToast("用戶登錄失敗", 'success', 1000)
    }
  }
})

/**
 * 獲取用戶的 openid
 *
 * @return thinkResponse
 */
public function openid()
{
    $code = input('?get.code') ? trim(input('get.code')) : '';
    if (!$code) {
        return json_encode(['error' => 2001, 'msg' => '獲取用戶登錄狀態(tài)失敗']);
    }
    $openid = $this->getOpenidFromMp($code);
    return json_encode(['error' => 0, 'msg' => '獲取用戶登錄狀態(tài)成功', 'result' => $openid]);
}

/**
 * 
 * 通過code從工作平臺(tái)獲取openid機(jī)器access_token
 * @param string $code 微信跳轉(zhuǎn)回來帶上的code
 * 
 * @return openid
 */
private function getOpenidFromMp($code)
{
    $url = $this->__CreateOauthUrlForOpenid($code);
    //初始化curl
    $ch = curl_init();
    //設(shè)置超時(shí)
    curl_setopt($ch, CURLOPT_TIMEOUT, $this->curl_timeout);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,FALSE);
    curl_setopt($ch, CURLOPT_HEADER, FALSE);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    if(WxPayConfig::CURL_PROXY_HOST != "0.0.0.0" && WxPayConfig::CURL_PROXY_PORT != 0){
        curl_setopt($ch,CURLOPT_PROXY, WxPayConfig::CURL_PROXY_HOST);
        curl_setopt($ch,CURLOPT_PROXYPORT, WxPayConfig::CURL_PROXY_PORT);
    }
    //運(yùn)行curl，結(jié)果以jason形式返回
    $res = curl_exec($ch);
    curl_close($ch);
    //取出openid
    $data = json_decode($res, true);
    $this->data = $data;
    $openid = $data['openid'];
    return $openid;
}

/**
 * 
 * 構(gòu)造獲取open和access_toke的url地址
 * @param string $code，微信跳轉(zhuǎn)帶回的code
 * 
 * @return 請(qǐng)求的url
 */
private function __CreateOauthUrlForOpenid($code)
{
    $urlObj["appid"] = WxPayConfig::APPID;
    $urlObj["secret"] = WxPayConfig::APPSECRET;
    $urlObj["code"] = $code;
    $urlObj["grant_type"] = "authorization_code";
    $bizString = $this->ToUrlParams($urlObj);
    return "https://api.weixin.qq.com/sns/oauth2/access_token?".$bizString;
}

/**
 * 
 * 拼接簽名字符串
 * @param array $urlObj
 * 
 * @return 返回已經(jīng)拼接好的字符串
 */
private function ToUrlParams($urlObj)
{
    $buff = "";
    foreach ($urlObj as $k => $v) {
        if ($k != "sign") {
            $buff .= $k . "=" . $v . "&";
        }
    }
    
    $buff = trim($buff, "&");
    return $buff;
}

/**
 * 退款通知回調(diào)
 *
 * @return void
 */
public function refund()
{
    $xml = file_get_contents("php://input");
    $obj = $this->fromXml($xml);

    if($obj['return_code'] != 'SUCCESS'){
        return $this->toXML(['return_code' => 'FAIL', 'return_msg' => '回調(diào)失敗']);
    }

    // 退款結(jié)果對(duì)重要的數(shù)據(jù)進(jìn)行了加密，商戶需要用商戶證書與商戶秘鑰進(jìn)行解密后才能獲得結(jié)果通知的內(nèi)容
    $string = $obj['req_info'];
    $data = base64_decode($string);
    $md5_key = md5(config('wxpay.key'));
    // AES解密
    $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB), MCRYPT_RAND);
    $res = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $md5_key, $data, MCRYPT_MODE_ECB, $iv);
    
    // 解密的字符串末尾多了 ^G 或 ^K 等雜亂字符 ,需去掉
    $res_arr = explode('</root>', $res);
    $req_info = $this->fromXml($res_arr[0].'</root>');
    
    //查詢訂單，判斷訂單真實(shí)性
    $order = OrderModel::where(['out_trade_no' => $req_info["out_trade_no"]])->find();
    if (!$order) {
        return $this->toXML(['return_code' => 'FAIL', 'return_msg' => '訂單不存在']);
    }

    $order->status = 2;
    if ($order->save()) {
        // TODO::存儲(chǔ)退款信息
        return $this->toXML(['return_code' => 'SUCCESS', 'return_msg' => 'OK']);
    }
    return $this->toXML(['return_code' => 'SUCCESS', 'return_msg' => 'OK']);
}

/**
 * 將xml轉(zhuǎn)為array
 *
 * @param [type] $xml
 * @return void
 */
public function fromXml($xml)
{   
    if(!$xml){
        return [];
    }
    //將XML轉(zhuǎn)為array
    //禁止引用外部xml實(shí)體
    libxml_disable_entity_loader(true);
    $values = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);      
    return $values;
}