package com.qs.mp.handler.auth;

import com.qs.mp.common.utils.sign.Md5Utils;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;


/**
 * 签名工具类
 * @author duota
 *
 */
public class SignUtils {

    protected static Logger logger = LoggerFactory.getLogger(SignUtils.class);
    @Value("${sign.md5key}")
    private static String md5key = "3Jr8S1K18rcC1wAfv8";
    public static String md5(String string) {
        byte[] hash;
        try {
            hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("UTF-8 is unsupported", e);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("MessageDigest不支持MD5Util", e);
        }
        StringBuilder hex = new StringBuilder(hash.length * 2);
        for (byte b : hash) {
            if ((b & 0xFF) < 0x10)
                hex.append("0");
            hex.append(Integer.toHexString(b & 0xFF));
        }
        return hex.toString();
    }

    public static boolean verifySign(String sign,String body,String timestamp) {
        String l = body+ "nonce"+ timestamp + md5key;
        logger.debug("sign str:"+l);
        String mySign = Md5Utils.hash(l);
        logger.debug("mySign:"+mySign+" sign:"+sign);
        return mySign.equals(sign);
    }
}