content: /*
   * Copyright (C) 2019 the original author or authors.
   *
   * 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.alibaba.nacos.client.naming.utils;
  
  import com.alibaba.nacos.client.identify.Base64;
  
  import javax.crypto.Mac;
  import javax.crypto.spec.SecretKeySpec;
  import java.nio.charset.Charset;
  
  /**
   * @author pbting
   * @date 2019-01-22 10:20 PM
   */
  public class SignUtil {
      public static final Charset UTF8 = Charset.forName("UTF-8");
  
      public SignUtil() {
      }
  
      public static String sign(String data, String key) throws Exception {
          try {
              byte[] signature = sign(data.getBytes(UTF8), key.getBytes(UTF8),
                  SignUtil.SigningAlgorithm.HmacSHA1);
              return new String(Base64.encodeBase64(signature));
          } catch (Exception var3) {
              throw new Exception(
                  "Unable to calculate a request signature: " + var3.getMessage(),
                  var3);
          }
      }
  
      private static byte[] sign(byte[] data, byte[] key,
                                 SignUtil.SigningAlgorithm algorithm) throws Exception {
          try {
              Mac mac = Mac.getInstance(algorithm.toString());
              mac.init(new SecretKeySpec(key, algorithm.toString()));
              return mac.doFinal(data);
          } catch (Exception var4) {
              throw new Exception(
                  "Unable to calculate a request signature: " + var4.getMessage(),
                  var4);
          }
      }
  
      public enum SigningAlgorithm {
          // Hmac SHA1 algorithm
          HmacSHA1;
  
          SigningAlgorithm() {
          }
      }
  }
  