package com.sensor.sellCabinet.util;

import cn.hutool.crypto.asymmetric.KeyType;
import cn.hutool.crypto.asymmetric.RSA;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.stereotype.Component;


/**
 * @author 辛毅
 * @date 2020/11/20
 */
@Slf4j
@Component
@ConditionalOnClass(RSA.class)
public class CryptHelper {
    private static String privateKey="";


    private static String publicKey="";



    private final RSA rsa;

    public CryptHelper() {
        this.rsa = new RSA(privateKey, publicKey);
    }

    public String encrypt(String originString) {
        return rsa.encryptBase64(originString, KeyType.PublicKey);
    }

    public String decrypt(String encryptString) {
        return new String(rsa.decryptFromBase64(encryptString,KeyType.PrivateKey));
    }

/*    public static void main(String[] args) throws Exception{
        String a="111111\n" +
            "1625549789963";
        System.out.println(new CryptHelper().encrypt(a));
        String s = "c1yB8wyDFeYd9pvk0CJagy5BhxKMjbTd3nQv7NjwMof2PNELhuzELWtiNt3VcGWhAUrARVd2T4ecSsbd5ywF4YhCFfJjyQ07fC4z6kAQ6GQ2Pu/2WP4Gfn+XeyLtG3FMtmC6gNnUPUqeZGCxlsgHuF4oGUkcPZHrStbJ+1/XV+U=";
        System.out.println(new CryptHelper().decrypt(s));
    }*/
    /**
     * 解密并校验时间戳
     *
     * @param encryptString 原文 + ‘\n‘ + 时间戳，加密后的字符串
     * @return 原文
     */
    public String decryptWithTimestamp(String encryptString) {
        String str = rsa.decryptStr(encryptString, KeyType.PrivateKey);
        String[] split = str.split("\n");
        if (split.length == 2) {
            long timestamp = Long.parseLong(split[1]);
            long now = System.currentTimeMillis();
            // 时间差超过三个小时，判定为伪造数据
            if (Math.abs(now - timestamp) > 3 * 3600 * 1000) {
                log.error("解密字符串中时间戳距离当前时间超过三个小时，解密结果无效 {}", str);
                throw new RuntimeException("解密失败");
            }
        }
        return split[0];
    }

    /**
     * 加密
     *
     * @param password 原文 + ‘\n‘ + 时间戳，加密后的字符串
     * @return 原文
     */
    public  String decryptPassword(String password) {
        long now = System.currentTimeMillis();
        String encryptString = password+"\n"+now;
        return encrypt(encryptString);
    }



}