package com.dsh.app.util.weChat;

import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;

public class WXCore {

    private static Logger logger = LoggerFactory.getLogger(WXCore.class);

    private static final String WATERMARK = "watermark";

    @Value("${wx.appletsAppid}")
    private static String appid ;



    /**
     * 解密数据
     * @return
     * @throws Exception
     */
    public static String decrypt(String encryptedData, String sessionKey, String iv){
        String result = "";
        try {
            AES aes = new AES();
            byte[] resultByte = aes.decrypt(Base64.decodeBase64(encryptedData), Base64.decodeBase64(sessionKey), Base64.decodeBase64(iv));
            if(null != resultByte && resultByte.length > 0){
                result = new String(WxPKCS7Encoder.decode(resultByte), "UTF-8");
//                JSONObject jsonObject = JSON.parseObject(result);
//                String decryptAppid = jsonObject.getJSONObject(WATERMARK).getString("appid");
//                if(!appid.equals(decryptAppid)){
//                    result = "";
//                }
            }
        } catch (Exception e) {
            result = "";
            e.printStackTrace();
        }
        return result;
    }
    /**
     * AES解密
     *
     * @param data   //密文，被加密的数据
     * @param key    //秘钥
     * @param iv     //偏移量
     * @return
     * @throws Exception
     */
    public static String decrypt1(String data, String key,String iv){
        //被加密的数据
        byte[] dataByte = Base64.decodeBase64(data);
        //加密秘钥
        byte[] keyByte = Base64.decodeBase64(key);
        //偏移量
        byte[] ivByte = Base64.decodeBase64(iv);
        try {
            AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivByte);
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            SecretKeySpec keySpec = new SecretKeySpec(keyByte, "AES");
            cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            return new String(cipher.doFinal(dataByte),"UTF-8");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /*public static void main(String[] args) throws Exception{
        String appId = "wx4f4bc4dec97d474b";
        String encryptedData = "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";
        String sessionKey = "tiihtNczf5v6AKRyjwEUhQ==";
        String iv = "r7BXXKkLb8qrSNn05n0qiA==";
        logger.info(decrypt(encryptedData, sessionKey, iv));
    }*/
}