/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/search/trunk/search-tool/tool/src/java/org/sakaiproject/search/tool/ControllerServlet.java $
* $Id: ControllerServlet.java 105078 2012-02-24 23:00:38Z ottenhoff@longsight.com $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008 The Sakai Foundation
*
* Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.search.tool;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.search.tool.api.SearchBeanFactory;
import org.sakaiproject.tool.api.SessionManager;
import org.sakaiproject.tool.api.Tool;
import org.sakaiproject.tool.api.ToolSession;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
/**
* @author Ian Boston
*/
public class ControllerServlet extends HttpServlet
{
public static final Log log = LogFactory.getLog(ControllerServlet.class);
/**
* Required for serialization... also to stop eclipse from giving me a
* warning!
*/
private static final long serialVersionUID = 676743152200357708L;
public static final String SAVED_REQUEST_URL = "org.sakaiproject.search.api.last-request-url";
private static final String PANEL = "panel";
private static final Object TITLE_PANEL = "Title";
private WebApplicationContext wac;
private SearchBeanFactory searchBeanFactory = null;
private SessionManager sessionManager;
public void init(ServletConfig servletConfig) throws ServletException
{
super.init(servletConfig);
ServletContext sc = servletConfig.getServletContext();
wac = WebApplicationContextUtils.getWebApplicationContext(sc);
try
{
searchBeanFactory = (SearchBeanFactory) wac
.getBean("search-searchBeanFactory");
ServletContext context = getServletContext();
searchBeanFactory.setContext(context);
}
catch (Exception ex)
{
int x = 1; //ignore
}
if (sessionManager == null)
{
sessionManager = (SessionManager) wac.getBean(SessionManager.class
.getName());
}
}
protected void doGet(final HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
execute(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
execute(request, response);
}
public void execute(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
if (wac == null)
{
wac = WebApplicationContextUtils
.getRequiredWebApplicationContext(this.getServletContext());
if (wac == null)
{
response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
"Cannot get WebApplicationContext");
return;
}
}
request.setAttribute(Tool.NATIVE_URL, Tool.NATIVE_URL);
if (searchBeanFactory == null)
{
searchBeanFactory = (SearchBeanFactory) wac
.getBean("search-searchBeanFactory");
ServletContext context = getServletContext();
searchBeanFactory.setContext(context);
}
if (sessionManager == null)
{
sessionManager = (SessionManager) wac.getBean(SessionManager.class
.getName());
}
addLocalHeaders(request);
String targetURL = persistState(request);
if (targetURL != null && targetURL.trim().length() > 0)
{
response.sendRedirect(targetURL);
return;
}
if (TITLE_PANEL.equals(request.getParameter(PANEL)))
{
String targetPage = "/WEB-INF/pages/title.jsp";
RequestDispatcher rd = request.getRequestDispatcher(targetPage);
rd.forward(request, response);
}
else
{
String path = request.getPathInfo();
if (path == null || path.length() == 0)
{
path = "/index";
}
if (!path.startsWith("/"))
{
path = "/" + path;
}
String targetPage = "/WEB-INF/pages" + path + ".jsp";
request.setAttribute(SearchBeanFactory.SEARCH_BEAN_FACTORY_ATTR,
searchBeanFactory);
RequestDispatcher rd = request.getRequestDispatcher(targetPage);
rd.forward(request, response);
}
request.removeAttribute(Tool.NATIVE_URL);
}
public void addLocalHeaders(HttpServletRequest request)
{
String sakaiHeader = (String) request.getAttribute("sakai.html.head");
String skin = "default/"; // this could be changed in the future to
// make search skin awaire
String localStylesheet = "<link href=\"/sakai-search-tool/styles/"
+ skin
+ "searchStyle.css\" type=\"text/css\" rel=\"stylesheet\" media=\"all\" />";
String localJavascript = "<script type=\"text/javascript\" src=\"/sakai-search-tool/scripts/search.js\"> </script>";
request.setAttribute("sakai.html.head", localStylesheet + sakaiHeader
+ localJavascript);
}
/**
* returns the request state for the tool. If the state is restored, we set
* the request attribute RWikiServlet.REQUEST_STATE_RESTORED to Boolean.TRUE
* and a Thread local named RWikiServlet.REQUEST_STATE_RESTORED to
* Boolean.TRUE. These MUST be checked by anything that modifies state, to
* ensure that a reinitialisation of Tool state does not result in a repost
* of data.
*
* @param request
* @return
*/
private String persistState(HttpServletRequest request)
{
ToolSession ts = sessionManager.getCurrentToolSession();
if (isPageToolDefault(request))
{
log.debug("Incomming URL is " + request.getRequestURL().toString()
+ "?" + request.getQueryString());
log.debug("Restore " + ts.getAttribute(SAVED_REQUEST_URL));
return (String) ts.getAttribute(SAVED_REQUEST_URL);
}
if (isPageRestorable(request))
{
ts.setAttribute(SAVED_REQUEST_URL, request.getRequestURL()
.toString()
+ "?" + request.getQueryString());
log.debug("Saved " + ts.getAttribute(SAVED_REQUEST_URL));
}
return null;
}
/**
* Check to see if the reques represents the Tool default page. This is not
* the same as the view Home. It is the same as first entry into a Tool or
* when the page is refreshed
*
* @param request
* @return true if the page is the Tool default page
*/
private boolean isPageToolDefault(HttpServletRequest request)
{
if (TITLE_PANEL.equals(request.getParameter(PANEL))) return false;
String pathInfo = request.getPathInfo();
String queryString = request.getQueryString();
String method = request.getMethod();
return ("GET".equalsIgnoreCase(method)
&& (pathInfo == null || request.getPathInfo().length() == 0) && (queryString == null || queryString
.length() == 0));
}
/**
* Check to see if the request represents a page that can act as a restor
* point.
*
* @param request
* @return true if it is possible to restore to this point.
*/
private boolean isPageRestorable(HttpServletRequest request)
{
if (TITLE_PANEL.equals(request.getParameter(PANEL))) return false;
String pathInfo = request.getPathInfo();
if (pathInfo != null)
{
if (request.getPathInfo().endsWith(".gif"))
{
return false;
}
if (request.getPathInfo().endsWith(".src"))
{
return false;
}
}
if ("GET".equalsIgnoreCase(request.getMethod())) return true;
return false;
}
}