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.oss.common.auth;
  
  import java.io.IOException;
  import java.net.HttpURLConnection;
  import java.net.URL;
  
  import com.aliyun.oss.common.auth.Credentials;
  import com.aliyun.oss.common.utils.AuthUtils;
  import com.aliyuncs.exceptions.ClientException;
  import com.aliyuncs.http.HttpRequest;
  import com.aliyuncs.http.HttpResponse;
  import com.aliyuncs.http.MethodType;
  import com.aliyuncs.http.clients.CompatibleUrlConnClient;
  
  public abstract class HttpCredentialsFetcher implements CredentialsFetcher {
  
      public abstract URL buildUrl() throws ClientException;
  
      public abstract Credentials parse(HttpResponse response) throws ClientException;
  
      @Override
      public Credentials fetch() throws ClientException {
          URL url = buildUrl();
          HttpRequest request = new HttpRequest(url.toString());
          request.setSysMethod(MethodType.GET);
          request.setSysConnectTimeout(AuthUtils.DEFAULT_HTTP_SOCKET_TIMEOUT_IN_MILLISECONDS);
          request.setSysReadTimeout(AuthUtils.DEFAULT_HTTP_SOCKET_TIMEOUT_IN_MILLISECONDS);
          
          HttpResponse response = null;
          try {
              response = send(request);
          } catch (IOException e) {
              throw new ClientException("CredentialsFetcher.fetch exception: " + e);
          }
          
          return parse(response);
      }
  
      @Override
      public HttpResponse send(HttpRequest request) throws IOException {
  
          HttpResponse response = null;
          try {
              response = CompatibleUrlConnClient.compatibleGetResponse(request);
          } catch (ClientException e) {
              throw new IOException(e);
          }
  
          if (response.getStatus() != HttpURLConnection.HTTP_OK) {
              throw new IOException("HttpCode=" + response.getStatus());
          }
          return response;
      }
  
      @Override
      public Credentials fetch(int retryTimes) throws ClientException {
          for (int i = 0; i <= retryTimes; i++) {
              try {
                  return fetch();
              } catch (ClientException e) {
                  if (i == retryTimes) {
                      throw e;
                  }
              }
          }
          throw new ClientException("Failed to connect ECS Metadata Service: Max retry times exceeded.");
      }
  
  }
  