content: package com.alibaba.langengine.volcenginetranslate.service;
  
  import com.alibaba.langengine.core.model.fastchat.service.RetrofitInitService;
  import com.alibaba.langengine.volcenginetranslate.model.VolcengineTranslateRequest;
  import com.alibaba.langengine.volcenginetranslate.model.VolcengineTranslateResponse;
  import lombok.Data;
  
  import java.time.Duration;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * 火山翻译服务
   *
   * @author Makoto
   */
  @Data
  public class VolcengineTranslateService extends RetrofitInitService<VolcengineTranslateApi> {
      
      private String accessKey;
      private String secretKey;
      private String region;
      private String service;
      private String version;
      private String action;
      
      public VolcengineTranslateService(String serverUrl, Duration timeout, String accessKey, String secretKey, 
                                        String region, String service, String version, String action) {
          super(serverUrl, timeout, false, accessKey, null);
          this.accessKey = accessKey;
          this.secretKey = secretKey;
          this.region = region;
          this.service = service;
          this.version = version;
          this.action = action;
      }
      
      @Override
      public Class<VolcengineTranslateApi> getServiceApiClass() {
          return VolcengineTranslateApi.class;
      }
      
      public VolcengineTranslateResponse translate(VolcengineTranslateRequest request) {
          Map<String, String> headers = new HashMap<>();
          headers.put("Authorization", generateAuthorization(request));
          headers.put("Content-Type", "application/json");
          headers.put("Host", service + ".volcengineapi.com");
          headers.put("X-Date", getCurrentDate());
          headers.put("X-Version", version);
          headers.put("X-Action", action);
          headers.put("X-Region", region);
          
          return execute(getApi().translate(request, headers));
      }
      
      private String generateAuthorization(VolcengineTranslateRequest request) {
          // 这里需要实现火山引擎的签名算法
          // 为了简化，这里返回一个占位符
          return "HMAC-SHA256 Credential=" + accessKey + "/" + getCurrentDate() + "/" + region + "/" + service + "/request";
      }
      
      private String getCurrentDate() {
          return java.time.Instant.now().toString().substring(0, 8);
      }
  }
  