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/*
 * The MIT License
 *
 * Copyright (c) 2015-2020 aoju.org All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.aoju.bus.http.secure;

import org.aoju.bus.http.Request;
import org.aoju.bus.http.Response;
import org.aoju.bus.http.Route;

import java.io.IOException;

/**
 * 在连接到代理服务器之前执行抢占式身份验证，
 * 或者在收到来自源web服务器或代理服务器的挑战后执行被动身份验证.
 * 代理身份验证器可以实现抢占式身份验证、反应式身份验证或两者都实现.
 * 应用程序可以为源服务器或代理服务器配置Httpd的身份验证器，或者两者都配置.
 *
 * @author Kimi Liu
 * @version 5.6.5
 * @since JDK 1.8+
 */
public interface Authenticator {

    /**
     * 不知道任何凭据且不尝试进行身份验证的验证程序.
     */
    Authenticator NONE = (route, response) -> null;

    /**
     * 该请求包含满足{@code response}中的身份验证挑战的凭据。如果无法满足挑战，则返回null.
     * 该路线是最好的努力，它目前可能不总是提供，即使在逻辑上可用
     * 在应用程序拦截器中手动重用身份验证器时，例如在实现特定于客户机的重试时，也可能不提供此功能
     *
     * @param route    路由信息
     * @param response 响应体
     * @return 返回一个请求
     * @throws IOException 异常信息
     */
    Request authenticate(Route route, Response response) throws IOException;

}