/*
 * Copyright (C), 2015-2019
 * FileName: FuncUtils
 * Author:   xx
 * Date:     2019/8/22 15:05
 * Description: FuncUtils
 * History:
 * <author>          <time>          <version>          <desc>
 */
package com.fr.plugin.tabledataservice.utils;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.IdUtil;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.crypto.Mode;
import cn.hutool.crypto.Padding;
import cn.hutool.crypto.asymmetric.KeyType;
import cn.hutool.crypto.asymmetric.SM2;
import cn.hutool.crypto.symmetric.SM4;
import com.fanruan.api.json.JSONKit;
import com.fr.base.Icon;
import com.fr.base.IconManager;
import com.fr.data.NetworkHelper;
import com.fr.general.ComparatorUtils;
import com.fr.general.IOUtils;
import com.fr.io.utils.MD5Calculator;
import com.fr.json.JSONObject;
import com.fr.locale.InterProviderFactory;
import com.fr.plugin.tabledataservice.ConfigTableDataService;
import com.fr.web.utils.WebUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.security.Security;
import java.util.*;

import static com.fr.plugin.tabledataservice.Constants.ICON_PATH;

/**
 * 〈Function Description〉<br>
 * 〈FuncUtils〉
 *
 * @author xx
 * @since 1.0.0
 */
public class FuncUtils {

    static {
        //如果是PKCS7Padding填充方式，则必须加上下面这行
        Security.addProvider(new BouncyCastleProvider());
    }

    /**
     * 数据加密和签名
     *
     * @param bizData 业务数据
     * @param result
     * @return
     */
    public static void encryptData(String bizData, JSONObject result) {
        //弹性平台sm2公钥
        String iqbPublicKey = ConfigTableDataService.getInstance().getIqbPublicKey();
        //可视化sm2私钥
        String visualPrivateKey = ConfigTableDataService.getInstance().getVisualPrivateKey();
        //可视化appId
        String appId = ConfigTableDataService.getInstance().getVisualAppId();
        String aesPw = RandomUtil.randomString(16);//明文sm4key
        String aesIv = RandomUtil.randomString(16); //sm4iv

        //对请求参数 sm4加密
        String encryptData = sm4Encrypt(bizData, aesPw, aesIv);

        //对明文aesPw sm2加密
        String key = sm2Encrypt(aesPw, iqbPublicKey);

        //组装请求参数
        HashMap<String, Object> encryptReqMap = new HashMap<>();
        encryptReqMap.put("appId", appId);
        encryptReqMap.put("time", DateUtil.format(new Date(), "yyyyMMddHHmmss"));
        encryptReqMap.put("data", encryptData);
        encryptReqMap.put("key", key);
        encryptReqMap.put("iv", aesIv);
        encryptReqMap.put("requestNo", IdUtil.getSnowflake(2, 1).nextIdStr() + IdUtil.getSnowflake(2, 1).nextIdStr());

        //获取待签名请求参数并用可视化私钥签名
        String waitSign = getSignContent(encryptReqMap);
        String signature = sign(waitSign, visualPrivateKey);

        //签名附加到请求参数
        result.put("appId", encryptReqMap.get("appId"));
        result.put("time", encryptReqMap.get("time"));
        result.put("data", encryptReqMap.get("data"));
        result.put("key", encryptReqMap.get("key"));
        result.put("iv", encryptReqMap.get("iv"));
        result.put("requestNo", encryptReqMap.get("requestNo"));
        result.put("sign", signature);
    }

    //SM2非对称加密
    private static String sm2Encrypt(String data, String publicKey) {
        return new SM2(null, publicKey).encryptBase64(data, KeyType.PublicKey);
    }

    //SM4对称加密
    private static String sm4Encrypt(String bizData, String key, String iv) {
        return cn.hutool.core.codec.Base64.encode(new SM4(Mode.CBC, Padding.PKCS5Padding, key.getBytes(), iv.getBytes()).encrypt(bizData));
    }

    //获取待签名数据
    private static String getSignContent(HashMap<String, Object> paramMap) {
        paramMap.remove("sign");
        Map<String, Object> stringObjectMap = sortMapByKey(paramMap);
        return JSONKit.create(stringObjectMap).encode();
    }

    /**
     * 根据map的key进行字典升序排序
     *
     * @param map
     * @return map
     */
    private static Map<String, Object> sortMapByKey(Map<String, Object> map) {
        Map<String, Object> treemap = new TreeMap<>(map);
        List<Map.Entry<String, Object>> list = new ArrayList<>(treemap.entrySet());
        list.sort(Map.Entry.comparingByKey());
        return treemap;
    }

    // 签名
    private static String sign(String data, String privateKey) {
        return cn.hutool.core.codec.Base64.encode(new SM2(privateKey, null).sign(data.getBytes(StandardCharsets.UTF_8)));
    }

    /**
     * MD5验证：key、报表路径、时间戳计算
     *
     * @param appKey
     * @param params
     * @return
     */
    public static Boolean validateMD5(String appKey, JSONObject params) {
        StringBuffer str = new StringBuffer();
        str.append(appKey);
        str.append(params.getString("report_path"));
        str.append(params.getString("timestamp"));
        String token = MD5Calculator.calculateMD5(str.toString().getBytes());
        return ComparatorUtils.equals(token, params.getString("sign"));
    }

    public static void printErrorJSON(HttpServletResponse res, int code) throws Exception {
        JSONObject errorJSON = JSONObject.create();
        errorJSON.put("err_code", code)
                .put("err_msg", InterProviderFactory.getProvider().getLocText("Plugin-tabledataservice_Error_" + code));
        WebUtils.printAsJSON(res, errorJSON);
    }

    public static JSONObject getParams(HttpServletRequest req) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(NetworkHelper.getRequestInputStream(req), "utf-8"));
        StringBuilder sb = new StringBuilder();
        String temp;
        while ((temp = br.readLine()) != null) {
            sb.append(temp);
        }
        br.close();
        return new JSONObject(sb.toString());
    }

    public static String loadIcon() {
        Icon icon = new Icon("json", IOUtils.readImage(ICON_PATH));
        IconManager.getIconManager().addIcon(icon, true);
        return icon.getName();
    }
}