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.odps.account;
  
  import com.aliyun.odps.commons.transport.Request;
  
  /**
   * RequestSigner用于对HTTP请求进行签名
   *
   * <p>
   * 不同的账号类型可能使用不同的签名机制或算法,{@link Account}的实现类一般是RequestSigner的工厂。
   * </p>
   */
  public interface RequestSigner {
  
    /**
     * 对HTTP请求签名
     *
     * <p>
     * 第一个参数resource表示RESTful资源标识
     * </p>
     *
     * @param resource
     *     资源标识, 如: /projects/my_project/tables/my_table
     * @param req
     *     {@link Request}
     */
    public void sign(String resource, Request req);
  }
  