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.auth.DefaultCredentials;
  import com.aliyun.oss.common.auth.InvalidCredentialsException;
  import com.aliyun.oss.common.utils.AuthUtils;
  import com.aliyun.oss.common.utils.StringUtils;
  
  /**
   * {@link SystemPropertiesCredentialsProvider} implementation that provides
   * credentials by looking at the <code>oss.accessKeyId</code> and
   * <code>oss.accessKeySecret</code> Java system properties.
   */
  public class SystemPropertiesCredentialsProvider implements CredentialsProvider {
  
      @Override
      public void setCredentials(Credentials creds) {
          
      }
  
      @Override
      public Credentials getCredentials() {
          String accessKeyId = StringUtils.trim(System.getProperty(AuthUtils.ACCESS_KEY_SYSTEM_PROPERTY));
          String secretAccessKey = StringUtils.trim(System.getProperty(AuthUtils.SECRET_KEY_SYSTEM_PROPERTY));
          String sessionToken = StringUtils.trim(System.getProperty(AuthUtils.SESSION_TOKEN_SYSTEM_PROPERTY));
  
          if (accessKeyId == null || accessKeyId.equals("")) {
              throw new InvalidCredentialsException("Access key id should not be null or empty.");
          }
          if (secretAccessKey == null || secretAccessKey.equals("")) {
              throw new InvalidCredentialsException("Secret access key should not be null or empty.");
          }
  
          return new DefaultCredentials(accessKeyId, secretAccessKey, sessionToken);
      }
  
  }
  