package com.panzhihua.applets.unionpay;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.digest.DigestUtils;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

/**
 * @author kkqiao
 * 全民付移动支付小程序支付订单关闭接口
 * 说明：
 * 用户创建订单之后，对未支付的订单进行关闭操作
 *  测试环境：http://58.247.0.18:29015/v1/netpay/close
 *  生产环境：https://api-mop.chinaums.com/v1/netpay/close
 */
public class Close {

//    static String url = "https://test-api-open.chinaums.com/v1/netpay/query";
    static String url = "https://api-mop.chinaums.com/v1/netpay/close";

    public static void main(String[] args) throws Exception{
        //1. 组建请求报文
        CloseBody reqBody = new CloseBody();
        reqBody.requestTimestamp = "2019-08-09 17:12:55";
        reqBody.mid = "898460107420248";
        reqBody.tid = "00000001";
        reqBody.instMid = "MINIDEFAULT";
        reqBody.merOrderId = "101771307dc89764b477474";
        System.out.println("request body:\n"+reqBody);

        //2. 获取认证报文，timestamp为当前日期，老旧日期无法请求成功
        String authorization = getAuthorization(UnionpayContent.APPID,UnionpayContent.APPKEY,
                "20190809171200","nonce",reqBody.toString());
        System.out.println("authorization:\n"+authorization);

        //3. 发送http请求，并解析返回信息
        String response = request(url,authorization,reqBody.toString());
        System.out.println("response:\n"+response);
    }

    /**
     * 发送http请求
     * @param url 请求url
     * @param authorization 认证报文
     * @param reqBody  请求体
     * @return response
     */
    static String request(String url, String authorization, String reqBody){
        String response = "";
        PrintWriter out = null;
        BufferedReader in = null;
        try{
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            HttpURLConnection httpUrlConnection = (HttpURLConnection) conn;
            httpUrlConnection.setRequestProperty("Content-Type", "application/json");
            httpUrlConnection.setRequestProperty("authorization",authorization);
            httpUrlConnection.setDoOutput(true);
            httpUrlConnection.setDoInput(true);
            out = new PrintWriter(httpUrlConnection.getOutputStream());
            out.write(reqBody);
            out.flush();
            httpUrlConnection.connect();
            in = new BufferedReader(new InputStreamReader(httpUrlConnection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                response += line;
            }
        }catch(Exception e){
            e.printStackTrace();
        } finally {
            try {
                if (out != null) { out.close();}
                if (in != null) {in.close();}
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
        return response;
    }

    /**
     * 获取签名头
     * @param appid
     * @param appkey
     * @param timestamp 格式:"yyyyMMddHHmmss"
     * @param nonce 随机字符串，
     * @param body 请求体
     * @return authorization 认证报文
     * @throws Exception
     */
    static String getAuthorization(String appid, String appkey, String timestamp, String nonce, String body) throws Exception {
        byte[] data = body.getBytes("utf-8");
        InputStream is = new ByteArrayInputStream(data);
        String testSH = DigestUtils.sha256Hex(is);
        String s1 = appid+timestamp+nonce+testSH;
        Mac mac = Mac.getInstance("HmacSHA256");
        mac.init(new SecretKeySpec(appkey.getBytes("utf-8"),"HmacSHA256"));
        byte[] localSignature = mac.doFinal(s1.getBytes("utf-8"));
        String localSignatureStr = Base64.encodeBase64String(localSignature);
        return  "OPEN-BODY-SIG AppId="+"\""+appid+"\""+", Timestamp="+"\""+timestamp+"\""+", Nonce="+"\""+nonce+"\""+", Signature="+"\""+localSignatureStr+"\"";
    }

    static class CloseBody{
        //消息ID
        String msgId;
        //报文请求时间，格式yyyy-MM-ddHH:mm:ss
        String requestTimestamp;
        //请求系统预留字段
        String srcReserve;
        //商户号
        String mid;
        //终端号
        String tid;
        //业务类型
        String instMid;
        //商户订单号
        String merOrderId;

        String toJson(){
            StringBuilder sb = new StringBuilder();
            sb.append("{");
            if (this.msgId != null) sb.append("\"msgId\":\"" + this.msgId + "\",");
            if (this.requestTimestamp != null) sb.append("\"requestTimestamp\":\"" + this.requestTimestamp + "\",");
            if (this.srcReserve != null) sb.append("\"srcReserve\":\"" + this.srcReserve + "\",");
            if (this.mid != null) sb.append("\"mid\":\"" + this.mid + "\",");
            if (this.tid != null) sb.append("\"tid\":\"" + this.tid + "\",");
            if (this.instMid != null) sb.append("\"instMid\":\"" + this.instMid + "\",");
            if (this.merOrderId != null) sb.append("\"merOrderId\":\"" + this.merOrderId + "\",");
            if (sb.charAt(sb.length() - 1) == ',')
                sb.deleteCharAt(sb.length() - 1);
            sb.append("}");
            return sb.toString();
        }

        public String toString(){
            return this.toJson();
        }

    }

}