package com.dsh.guns.modular.system.controller.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;

/**
 * 曹操接口请求签名工具包
 * @author 吕雪
 * @createDate 2020年01月15日
 * client_id:f168c651bf86f2c1
 * sign_key:6d2c6566598949478bef1b5d91451e9f
 */
public class SignUtil {

    /**
     * 获取签名
     * @param params
     * @return
     */
    public static String sign(Map<String, Object> params){
        params.put("sign_key", "6d2c6566598949478bef1b5d91451e9f");
        Map<String, String> needVerify = new HashMap<>();
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            needVerify.put(entry.getKey(), String.valueOf(entry.getValue()));
        }
        List<Map.Entry<String, String>> entryList = new ArrayList<>(needVerify.entrySet());
        //排序
        Collections.sort(entryList, (o1, o2) -> o1.getKey().compareTo(o2.getKey()));
        StringBuilder buffer = new StringBuilder();
        for (Map.Entry<String, String> entry : entryList) {
            buffer.append(entry.getKey()).append(entry.getValue());
        }
        System.out.println("sha1 签名参数:"+buffer.toString());
        try {
            return encodeBySHA(buffer.toString(),"utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 使用SHA算法加密
     * @param str
     * @param charset
     * @return
     * @throws Exception
     */
    public static String encodeBySHA(String str,String charset) throws Exception {
        MessageDigest messageDigest = null;
        try {
            messageDigest = MessageDigest.getInstance("SHA");
            messageDigest.reset();
            messageDigest.update(str.getBytes(charset));

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            throw new Exception("不能调用指定的加密算法。");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            throw new Exception("字符串不支持"+ charset +"的转换。");
        }
        return byteArrayToString(messageDigest.digest());
    }

    /**
     * 将byte数组转化为16进制字符串
     * @param byteArray
     * @return
     */
    private static String byteArrayToString(byte[] byteArray){
        StringBuilder strBuilder = new StringBuilder();
        for (int i = 0; i < byteArray.length; i++) {
            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
                strBuilder.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
            } else {
                strBuilder.append(Integer.toHexString(0xFF & byteArray[i]));
            }
        }
        return strBuilder.toString();
    }



}