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/*
 * Copyright (c) 2018, hiwepy (https://github.com/hiwepy).
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.github.tobato.fastdfs.spring.boot.utils;

import java.security.NoSuchAlgorithmException;

public class FastdfsUtils {

	public static String g_charset = "ISO8859-1";
	
	/**
	 * get token for file URL
	 * 
	 * @param file_id    the file id return by FastDFS server
	 * @param ts         unix timestamp, unit: second
	 * @param secret_key the secret key
	 * @return token string
	 * @throws Exception if Exception
	 */
	public static String getToken(String file_id, long ts, String secret_key) throws Exception {
		byte[] bsFileId = file_id.getBytes(g_charset);
		byte[] bsKey = secret_key.getBytes(g_charset);
		byte[] bsTimestamp = Long.valueOf(ts).toString().getBytes(g_charset);

		byte[] buff = new byte[bsFileId.length + bsKey.length + bsTimestamp.length];
		System.arraycopy(bsFileId, 0, buff, 0, bsFileId.length);
		System.arraycopy(bsKey, 0, buff, bsFileId.length, bsKey.length);
		System.arraycopy(bsTimestamp, 0, buff, bsFileId.length + bsKey.length, bsTimestamp.length);

		return md5(buff);
	}

	/**
	 * md5 function
	 * 
	 * @param source the input buffer
	 * @return md5 string
	 * @throws NoSuchAlgorithmException if Exception
	 */
	public static String md5(byte[] source) throws NoSuchAlgorithmException {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
		java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
		md.update(source);
		byte tmp[] = md.digest();
		char str[] = new char[32];
		int k = 0;
		for (int i = 0; i < 16; i++) {
			str[k++] = hexDigits[tmp[i] >>> 4 & 0xf];
			str[k++] = hexDigits[tmp[i] & 0xf];
		}

		return new String(str);
	}
	
}