Pay服務層

<?php

namespace app\api\service;


use app\api\model\Order as OrderModel;
use app\lib\exception\OrderException;
use app\lib\exception\TokenException;
use think\Exception;
use think\Loader;
use think\Log;

//Loader::import('WxPay.WxPay', EXTEND_PATH, '.Data.php');
Loader::import('WxPay.WxPay', EXTEND_PATH, '.Api.php');


class Pay
{
    private $orderNo;
    private $orderID;
//    private $orderModel;

    function __construct($orderID)
    {
        if (!$orderID)
        {
            throw new Exception('訂單號不允許為NULL');
        }
        $this->orderID = $orderID;
    }

    public function pay()
    {
        $this->checkOrderValid();
        $order = new Order();
        $status = $order->checkOrderStock($this->orderID);
        if (!$status['pass'])
        {
            return $status;
        }
        return $this->makeWxPreOrder($status['orderPrice']);
        //        $this->checkProductStock();
    }

    // 構建微信支付訂單資訊
    private function makeWxPreOrder($totalPrice)
    {
        $openid = Token::getCurrentTokenVar('openid');

        if (!$openid)
        {
            throw new TokenException();
        }
        $wxOrderData = new \WxPayUnifiedOrder();
        $wxOrderData->SetOut_trade_no($this->orderNo);
        $wxOrderData->SetTrade_type('JSAPI');
        $wxOrderData->SetTotal_fee($totalPrice * 100);
        $wxOrderData->SetBody('零食商販');
        $wxOrderData->SetOpenid($openid);
        $wxOrderData->SetNotify_url(config('secure.pay_back_url'));

        return $this->getPaySignature($wxOrderData);
    }

    //向微信請求訂單號並生成簽名
    private function getPaySignature($wxOrderData)
    {
        $wxOrder = \WxPayApi::unifiedOrder($wxOrderData);
        // 失敗時不會返回result_code
        if($wxOrder['return_code'] != 'SUCCESS' || $wxOrder['result_code'] !='SUCCESS'){
            Log::record($wxOrder,'error');
            Log::record('獲取預支付訂單失敗','error');
//            throw new Exception('獲取預支付訂單失敗');
        }
        $this->recordPreOrder($wxOrder);
        $signature = $this->sign($wxOrder);
        return $signature;
    }

    private function recordPreOrder($wxOrder){
        // 必須是update，每次使用者取消支付後再次對同一訂單支付，prepay_id是不同的
        OrderModel::where('id', '=', $this->orderID)
            ->update(['prepay_id' => $wxOrder['prepay_id']]);
    }

    // 簽名
    private function sign($wxOrder)
    {
        $jsApiPayData = new \WxPayJsApiPay();
        $jsApiPayData->SetAppid(config('wx.app_id'));
        $jsApiPayData->SetTimeStamp((string)time());
        $rand = md5(time() . mt_rand(0, 1000));
        $jsApiPayData->SetNonceStr($rand);
        $jsApiPayData->SetPackage('prepay_id=' . $wxOrder['prepay_id']);
        $jsApiPayData->SetSignType('md5');
        $sign = $jsApiPayData->MakeSign();
        $rawValues = $jsApiPayData->GetValues();
        $rawValues['paySign'] = $sign;
        unset($rawValues['appId']);
        return $rawValues;
    }

    /**
     * @return bool
     * @throws OrderException
     * @throws TokenException
     */
    private function checkOrderValid()
    {
        $order = OrderModel::where('id', '=', $this->orderID)
            ->find();
        if (!$order)
        {
            throw new OrderException();
        }
//        $currentUid = Token::getCurrentUid();
        if(!Token::isValidOperate($order->user_id))
        {
            throw new TokenException(
                [
                    'msg' => '訂單與使用者不匹配',
                    'errorCode' => 10003
                ]);
        }
        if($order->status != 1){
            throw new OrderException([
                'msg' => '訂單已支付過啦',
                 'errorCode' => 80003,
                'code' => 400
            ]);
        }
        $this->orderNo = $order->order_no;
        return true;
    }
}