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.auth.Credentials;
  import com.aliyun.oss.common.auth.CredentialsProvider;
  import com.aliyun.oss.common.utils.AuthUtils;
  import com.aliyun.oss.common.utils.LogUtils;
  import com.aliyuncs.DefaultAcsClient;
  import com.aliyuncs.auth.KeyPairCredentials;
  import com.aliyuncs.auth.sts.GetSessionAccessKeyRequest;
  import com.aliyuncs.auth.sts.GenerateSessionAccessKeyResponse;
  import com.aliyuncs.exceptions.ClientException;
  import com.aliyuncs.http.ProtocolType;
  import com.aliyuncs.profile.IClientProfile;
  
  /**
   * STSKeyPairSessionCredentialsProvider implementation that uses the RSA key
   * pair to create temporary, short-lived sessions to use for authentication.
   */
  public class STSKeyPairSessionCredentialsProvider implements CredentialsProvider {
  
      public STSKeyPairSessionCredentialsProvider(KeyPairCredentials keyPairCredentials, IClientProfile profile) {
          this.keyPairCredentials = keyPairCredentials;
          this.ramClient = new DefaultAcsClient(profile, keyPairCredentials);
      }
  
      public STSKeyPairSessionCredentialsProvider withExpiredDuration(long expiredDurationSeconds) {
          this.expiredDurationSeconds = expiredDurationSeconds;
          return this;
      }
  
      public STSKeyPairSessionCredentialsProvider withExpiredFactor(double expiredFactor) {
          this.expiredFactor = expiredFactor;
          return this;
      }
  
      @Override
      public void setCredentials(Credentials creds) {
  
      }
  
      @Override
      public Credentials getCredentials() {
          if (sessionCredentials == null || sessionCredentials.willSoonExpire()) {
              sessionCredentials = getNewSessionCredentials();
          }
          return sessionCredentials;
      }
  
      private BasicCredentials getNewSessionCredentials() {
          GetSessionAccessKeyRequest request = new GetSessionAccessKeyRequest();
          request.setPublicKeyId(keyPairCredentials.getAccessKeyId());
          request.setDurationSeconds((int) expiredDurationSeconds);
          request.setSysProtocol(ProtocolType.HTTPS);
  
          GenerateSessionAccessKeyResponse response = null;
          try {
              response = this.ramClient.getAcsResponse(request);
          } catch (ClientException e) {
              LogUtils.logException("RamClient.getAcsResponse Exception:", e);
              return null;
          }
  
          return new BasicCredentials(response.getSessionAccessKey().getSessionAccessKeyId(),
                  response.getSessionAccessKey().getSessionAccessKeySecert(), null, expiredDurationSeconds)
                          .withExpiredFactor(expiredFactor);
      }
  
      private DefaultAcsClient ramClient;
      private KeyPairCredentials keyPairCredentials;
      private BasicCredentials sessionCredentials;
  
      private long expiredDurationSeconds = AuthUtils.DEFAULT_EXPIRED_DURATION_SECONDS;
      private double expiredFactor = AuthUtils.DEFAULT_EXPIRED_FACTOR;
  
  }