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 com.aliyun.oss.common.utils.AuthUtils;
  import com.aliyun.oss.common.utils.LogUtils;
  import com.aliyuncs.DefaultAcsClient;
  import com.aliyuncs.auth.AlibabaCloudCredentials;
  import com.aliyuncs.auth.AlibabaCloudCredentialsProvider;
  import com.aliyuncs.auth.StaticCredentialsProvider;
  import com.aliyuncs.auth.sts.AssumeRoleRequest;
  import com.aliyuncs.auth.sts.AssumeRoleResponse;
  import com.aliyuncs.exceptions.ClientException;
  import com.aliyuncs.profile.IClientProfile;
  
  /**
   * STSAssumeRoleSessionCredentialsProvider implementation that uses the STS
   * Security Token Service to assume a Role and create temporary, short-lived
   * sessions to use for authentication.
   */
  public class STSAssumeRoleSessionCredentialsProvider implements CredentialsProvider {
  
      public STSAssumeRoleSessionCredentialsProvider(AlibabaCloudCredentials longLivedCredentials, String roleArn,
              IClientProfile clientProfile) {
          this(new StaticCredentialsProvider(longLivedCredentials), roleArn, clientProfile);
      }
  
      public STSAssumeRoleSessionCredentialsProvider(AlibabaCloudCredentialsProvider longLivedCredentialsProvider,
              String roleArn, IClientProfile clientProfile) {
          if (roleArn == null) {
              throw new NullPointerException("You must specify a value for roleArn.");
          }
          this.roleArn = roleArn;
          this.roleSessionName = getNewRoleSessionName();
          this.ramClient = new DefaultAcsClient(clientProfile, longLivedCredentialsProvider);
      }
  
      public STSAssumeRoleSessionCredentialsProvider withRoleSessionName(String roleSessionName) {
          this.roleSessionName = roleSessionName;
          return this;
      }
  
      public STSAssumeRoleSessionCredentialsProvider withExpiredFactor(double expiredFactor) {
          this.expiredFactor = expiredFactor;
          return this;
      }
  
      public STSAssumeRoleSessionCredentialsProvider withExpiredDuration(long expiredDurationSeconds) {
          if (expiredDurationSeconds < 900 || expiredDurationSeconds > 3600) {
              throw new IllegalArgumentException("Assume Role session duration should be in the range of 15min - 1hour");
          }
          this.expiredDurationSeconds = expiredDurationSeconds;
          return this;
      }
  
      public static String getNewRoleSessionName() {
          return "aliyun-java-sdk-" + System.currentTimeMillis();
      }
  
      @Override
      public void setCredentials(Credentials creds) {
  
      }
  
      @Override
      public Credentials getCredentials() {
          if (credentials == null || credentials.willSoonExpire()) {
              synchronized (this) {
                  if (credentials == null || credentials.willSoonExpire()) {
                      credentials = getNewSessionCredentials();
                  }
              }
          }
          return credentials;
      }
  
      private BasicCredentials getNewSessionCredentials() {
          AssumeRoleRequest assumeRoleRequest = new AssumeRoleRequest();
          assumeRoleRequest.setRoleArn(roleArn);
          assumeRoleRequest.setRoleSessionName(roleSessionName);
          assumeRoleRequest.setDurationSeconds(expiredDurationSeconds);
  
          AssumeRoleResponse response = null;
          try {
              response = ramClient.getAcsResponse(assumeRoleRequest);
          } catch (ClientException e) {
              LogUtils.logException("RamClient.getAcsResponse Exception:", e);
              return null;
          }
  
          return new BasicCredentials(response.getCredentials().getAccessKeyId(),
                  response.getCredentials().getAccessKeySecret(), response.getCredentials().getSecurityToken(),
                  expiredDurationSeconds).withExpiredFactor(expiredFactor);
      }
  
      private final DefaultAcsClient ramClient;
      private final String roleArn;
      private String roleSessionName;
      private volatile BasicCredentials credentials;
  
      private long expiredDurationSeconds = AuthUtils.DEFAULT_EXPIRED_DURATION_SECONDS;
      private double expiredFactor = AuthUtils.DEFAULT_EXPIRED_FACTOR;
  
  }
  