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package com.memfactory.auth.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.digest.DigestUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * MD5 工具类
 * 
 * @author zhairp createDate: 2018-09-25
 */
public final class Md5Util {
	private static final Logger LOG = LoggerFactory.getLogger(Md5Util.class);
	
	private Md5Util() {
	}

	private static char[] hexChar = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

	/**
	 * 对消息计算MD5， 结果用Hex（十六进制）编码
	 *
	 * @param message 消息
	 * @return MD5之后的结果
	 */
	public static String md5(String message) {
		return DigestUtils.md5Hex(message);
	}

	/**
	 * 计算文件MD5
	 * 
	 * @author zhairp createDate: 2018-09-25
	 * @param file 需要对文件内容加密处理的文件
	 * @return 文件内容经过MD5之后的结果
	 */
	public static String md5File(File file) {
		try {
			InputStream ins = new FileInputStream(file);
			byte[] buffer = new byte[8192];
			MessageDigest md5 = MessageDigest.getInstance("MD5");

			int len;
			while ((len = ins.read(buffer)) != -1) {
				md5.update(buffer, 0, len);
			}
			ins.close();
			byte[] bytes = md5.digest();
			StringBuilder sb = new StringBuilder(bytes.length * 2);
			for (int i = 0; i < bytes.length; i++) {
				sb.append(hexChar[(bytes[i] & 0xf0) >>> 4]);
				sb.append(hexChar[bytes[i] & 0x0f]);
			}
			return sb.toString();
		} catch (NoSuchAlgorithmException | IOException e) {
			LOG.error("计算文件MD5异常", e);
			e.printStackTrace();
		}
		return null;
	}

}