content: /*
   * Copyright ©2015-2023 Jaemon. All Rights Reserved.
   *
   * 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.jaemon.dinger.support.sign;
  
  import javax.crypto.Mac;
  import javax.crypto.spec.SecretKeySpec;
  import java.net.URLEncoder;
  import java.nio.charset.StandardCharsets;
  import java.util.Base64;
  
  /**
   * DingTalk签名接口
   *
   * @author Jaemon
   * @since 1.0
   */
  public interface DingerSignAlgorithm<T extends SignBase> {
  
      /**
       * 签名
       *
       * @param secret
       *              秘钥
       * @return
       *              返回信息
       * @throws Exception
       *              ex
       */
      T sign(String secret) throws Exception;
  
      /**
       * 默认算法
       *
       * @param timestamp
       *              时间戳
       * @param secret
       *              秘钥
       * @return
       *              签名结果
       * @throws Exception
       *              ex
       */
      default String algorithm(Long timestamp, String secret) throws Exception {
          String stringToSign = timestamp + "\n" + secret;
          Mac mac = Mac.getInstance("HmacSHA256");
          mac.init(
                  new SecretKeySpec(secret.getBytes(StandardCharsets.UTF_8), "HmacSHA256")
          );
          byte[] signData = mac.doFinal(
                  stringToSign.getBytes(StandardCharsets.UTF_8)
          );
          String sign = URLEncoder.encode(
                  Base64.getEncoder().encodeToString(signData),
                  StandardCharsets.UTF_8.name()
          );
          return sign;
      }
  }