ExternalContentController.java

/**
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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
 *
 *         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 edu.unc.lib.dl.ui.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import edu.unc.lib.dl.ui.exception.ResourceNotFoundException;
import edu.unc.lib.dl.ui.util.ExternalContentSettings;

/**
 * Simple controller for transferring users to an allowed subset of external pages, with support for 
 * redirecting or embedding.
 * @author bbpennel
 */
@Controller
@RequestMapping("/external")
public class ExternalContentController {
	@SuppressWarnings("unused")
	private static final Logger LOG = LoggerFactory.getLogger(ExternalContentController.class);
	
	@RequestMapping(method = RequestMethod.POST)
	public String handlePost(Model model, HttpServletRequest request, HttpServletResponse response) throws Exception {
		String page = request.getParameter("page");
		//Support for redirecting post requests?
		//Map parameters = request.getParameterMap();
		return forwardToContent(page, model, request, response);
	}
	
	@RequestMapping(method = RequestMethod.GET)
	public String handleRequest(Model model, HttpServletRequest request, HttpServletResponse response) throws Exception {
		String page = request.getParameter("page");
		return forwardToContent(page, model, request, response);
	}
	
	private String forwardToContent(String page, Model model, HttpServletRequest request, HttpServletResponse response) throws Exception {
		String contentUrl = ExternalContentSettings.getUrl(page);
		//If no page was specified or if an invalid page was requested, then issue a 404 error.
		if (page == null || contentUrl == null){
			throw new ResourceNotFoundException();
		}
		if (contentUrl.indexOf("redirect:") == 0){
			return contentUrl;
		}
		model.addAttribute("contentUrl", contentUrl);
		return "externalTemplate";
	}
}