content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.aliyun.api.gateway.demo.util;
  
  import com.aliyun.api.gateway.demo.constant.Constants;
  import org.apache.commons.codec.binary.Base64;
  
  import java.io.UnsupportedEncodingException;
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  
  /**
   * 消息摘要工具
   */
  public class MessageDigestUtil {
      /**
       * 先进行MD5摘要再进行Base64编码获取摘要字符串
       *
       * @param str
       * @return
       */
      public static String base64AndMD5(String str) {
          if (str == null) {
              throw new IllegalArgumentException("inStr can not be null");
          }
          return base64AndMD5(toBytes(str));
      }
  
      /**
       * 先进行MD5摘要再进行Base64编码获取摘要字符串
       *
       * @return
       */
      public static String base64AndMD5(byte[] bytes) {
          if (bytes == null) {
              throw new IllegalArgumentException("bytes can not be null");
          }
          try {
              final MessageDigest md = MessageDigest.getInstance("MD5");
              md.reset();
              md.update(bytes);
              final Base64 base64 = new Base64();
              final byte[] enbytes = base64.encode(md.digest());
              return new String(enbytes);
          } catch (final NoSuchAlgorithmException e) {
              throw new IllegalArgumentException("unknown algorithm MD5");
          }
      }
  
      /**
       * UTF-8编码转换为ISO-9959-1
       *
       * @param str
       * @return
       */
      public static String utf8ToIso88591(String str) {
          if (str == null) {
              return str;
          }
  
          try {
              return new String(str.getBytes("UTF-8"), "ISO-8859-1");
          } catch (UnsupportedEncodingException e) {
              throw new RuntimeException(e.getMessage(), e);
          }
      }
  
      /**
       * ISO-9959-1编码转换为UTF-8
       *
       * @param str
       * @return
       */
      public static String iso88591ToUtf8(String str) {
          if (str == null) {
              return str;
          }
  
          try {
              return new String(str.getBytes("ISO-8859-1"), "UTF-8");
          } catch (UnsupportedEncodingException e) {
              throw new RuntimeException(e.getMessage(), e);
          }
      }
  
      /**
       * String转换为字节数组
       *
       * @param str
       * @return
       */
      private static byte[] toBytes(final String str) {
          if (str == null) {
              return null;
          }
          try {
              return str.getBytes(Constants.ENCODING);
          } catch (final UnsupportedEncodingException e) {
              throw new RuntimeException(e.getMessage(), e);
          }
      }
  }
  