package com.engine.salary.util.aes;

import com.weaver.formmodel.util.StringHelper;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import sun.misc.BASE64Decoder;
import weaver.general.Util;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;


public class AESUtils {

    /**
     * 密钥
     */
    public static String KEY = "123";

    /**
     * 算法
     */
    private static final String ALGORITHMSTR = "AES/ECB/PKCS5Padding";

    public static void main(String[] args) throws Exception {
        String content = " {&} bt1|17379|1|1|1=";//啊啊
        //System.out.println("加密前：" + content);

        String encrypt = aesEncrypt(content);
        //System.out.println("加密后：" + encrypt);

        String decrypt = aesDecrypt(encrypt);
        //System.out.println("解密后===>" + decrypt+"<===");
    }

    /**
     * aes解密
     * @param encrypt	内容
     * @return
     * @throws Exception
     */
    public static String aesDecrypt(String encrypt) throws Exception {
        if(StringHelper.isEmpty(encrypt)){
            return "";
        }

        encrypt = encrypt.replace("_ADD_","+");
        encrypt = encrypt.replace("_EQU_","=");
        encrypt = encrypt.replace("_SEP_","/");
        return aesDecrypt(encrypt, KEY);
    }

    /**
     * aes加密
     * @param content
     * @return
     * @throws Exception
     */
    public static String aesEncrypt(String content) throws Exception {
        if(StringHelper.isEmpty(content)){
            return "";
        }

        String str = aesEncrypt(content, KEY);
        str = str.replace("+", "_ADD_");
        str = str.replace("=", "_EQU_");
        str = str.replace("/", "_SEP_");
        return str;
    }

    /**
     * 将byte[]转为各种进制的字符串
     * @param bytes byte[]
     * @param radix 可以转换进制的范围，从Character.MIN_RADIX到Character.MAX_RADIX，超出范围后变为10进制
     * @return 转换后的字符串
     */
    public static String binary(byte[] bytes, int radix){
        return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
    }

    /**
     * base 64 encode
     * @param bytes 待编码的byte[]
     * @return 编码后的base 64 code
     */
    public static String base64Encode(byte[] bytes){
        byte[] b = Base64.encodeBase64(bytes);
        String str = "";
        try {
            str =  new String(b,"UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return str;
    }

    /**
     * base 64 decode
     * @param base64Code 待解码的base 64 code
     * @return 解码后的byte[]
     * @throws Exception
     */
    public static byte[] base64Decode(String base64Code) throws Exception{
        return StringUtils.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
    }


    /**
     * 将base64_编码解密
     * @param s
     * @return
     */
    public static String base64DecodeForMultilang(String s) {
        if (s == null) {
            return s;
        }
        if(Util.isEnableMultiLang()){
            try {
                BASE64Decoder base64Decoder = new BASE64Decoder();
                return new String(base64Decoder.decodeBuffer(s.replaceAll("base64_", "")),"utf-8");
            } catch (Exception e) {
                e.printStackTrace();
                return s;
            }
        }else{
            return s;
        }

    }

    /**
     * AES加密
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的byte[]
     * @throws Exception
     */
    public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);
        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(), "AES"));

        return cipher.doFinal(content.getBytes("utf-8"));
    }


    /**
     * AES加密为base 64 code
     * @param content 待加密的内容
     * @param encryptKey 加密密钥
     * @return 加密后的base 64 code
     * @throws Exception
     */
    public static String aesEncrypt(String content, String encryptKey) throws Exception {
        if(StringHelper.isEmpty(content)){
            return "";
        }
        return base64Encode(aesEncryptToBytes(content, encryptKey));
    }

    /**
     * AES解密
     * @param encryptBytes 待解密的byte[]
     * @param decryptKey 解密密钥
     * @return 解密后的String
     * @throws Exception
     */
    public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128);

        Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
        byte[] decryptBytes = cipher.doFinal(encryptBytes);

        return new String(decryptBytes,"UTF-8");
    }


    /**
     * 将base 64 code AES解密
     * @param encryptStr 待解密的base 64 code
     * @param decryptKey 解密密钥
     * @return 解密后的string
     * @throws Exception
     */
    public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
        if(StringHelper.isEmpty(encryptStr)){
            return "";
        }
        return StringHelper.isEmpty(encryptStr) ? "" : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
    }

}
