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/*
 * Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed 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
 *
 *      https://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 org.springframework.security.web;

import java.io.IOException;

import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.access.ExceptionTranslationFilter;

/**
 * Used by {@link ExceptionTranslationFilter} to commence an authentication scheme.
 *
 * @author Ben Alex
 */
public interface AuthenticationEntryPoint {

	/**
	 * Commences an authentication scheme.
	 * 
	 * ExceptionTranslationFilter will populate the HttpSession
	 * attribute named
	 * AbstractAuthenticationProcessingFilter.SPRING_SECURITY_SAVED_REQUEST_KEY
	 * with the requested target URL before calling this method.
	 * 
	 * Implementations should modify the headers on the ServletResponse as
	 * necessary to commence the authentication process.
	 * @param request that resulted in an AuthenticationException
	 * @param response so that the user agent can begin authentication
	 * @param authException that caused the invocation
	 */
	void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException authException)
			throws IOException, ServletException;

}