CASLogoutSuccessHandler.java

/*
 * This file is part of ARSnova Backend.
 * Copyright (C) 2012-2017 The ARSnova Team
 *
 * ARSnova Backend is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ARSnova Backend is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.thm.arsnova;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.DefaultRedirectStrategy;
import org.springframework.security.web.RedirectStrategy;
import org.springframework.security.web.authentication.logout.LogoutSuccessHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * This class gets called when a user has been successfully logged out from CAS.
 */
public class CASLogoutSuccessHandler implements LogoutSuccessHandler {

	private static final Logger logger = LoggerFactory.getLogger(CASLogoutSuccessHandler.class);

	private String casUrl;
	private String defaultTarget;

	private final RedirectStrategy redirectStrategy = new DefaultRedirectStrategy();

	@Override
	public void onLogoutSuccess(
			final HttpServletRequest request,
			final HttpServletResponse response,
			final Authentication authentication
	) throws IOException, ServletException {
		/* Typo in "referer" intended. It is in the spec. */
		String referrer = request.getHeader("referer");
		if (response.isCommitted()) {
			logger.info("Response has already been committed. Unable to redirect to target");
			return;
		}
		redirectStrategy.sendRedirect(
				request,
				response,
				(casUrl + "/logout?url=") + (referrer != null ? referrer : defaultTarget)
		);
	}

	public void setCasUrl(final String newCasUrl) {
		casUrl = newCasUrl;
	}

	public void setDefaultTarget(final String newDefaultTarget) {
		defaultTarget = newDefaultTarget;
	}
}