/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/rwiki/trunk/rwiki-tool/tool/src/java/uk/ac/cam/caret/sakai/rwiki/tool/RWikiServlet.java $
* $Id: RWikiServlet.java 81708 2010-08-24 04:46:04Z steve.swinsburg@gmail.com $
***********************************************************************************
*
* Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
*
* Licensed under the Educational Community License, Version 1.0 (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/ecl1.php
*
* 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 uk.ac.cam.caret.sakai.rwiki.tool;
import org.sakaiproject.component.cover.ServerConfigurationService;
import java.io.IOException;
import java.util.Enumeration;
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.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.tool.api.Tool;
import org.sakaiproject.tool.api.ToolSession;
import org.sakaiproject.tool.cover.SessionManager;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import uk.ac.cam.caret.sakai.rwiki.tool.api.HttpCommand;
import uk.ac.cam.caret.sakai.rwiki.tool.bean.PrePopulateBean;
import uk.ac.cam.caret.sakai.rwiki.tool.bean.ViewBean;
import uk.ac.cam.caret.sakai.rwiki.tool.command.Dispatcher;
import uk.ac.cam.caret.sakai.rwiki.tool.command.SaveCommand;
import uk.ac.cam.caret.sakai.rwiki.tool.util.WikiPageAction;
import uk.ac.cam.caret.sakai.rwiki.utils.TimeLogger;
/**
* @author andrew
*/
public class RWikiServlet extends HttpServlet
{
private static Log log = LogFactory.getLog(RWikiServlet.class);
/**
* Required for serialization... also to stop eclipse from giving me a
* warning!
*/
private static final long serialVersionUID = 676743152200357706L;
public static final String SAVED_REQUEST_URL = "uk.ac.cam.caret.sakai.rwiki.tool.RWikiServlet.last-request-url";
private WebApplicationContext wac;
private String headerPreContent;
private String headerScriptSource;
private String footerScript;
private Dispatcher dispatcher = null;
public void init(ServletConfig servletConfig) throws ServletException
{
super.init(servletConfig);
ServletContext sc = servletConfig.getServletContext();
wac = WebApplicationContextUtils.getWebApplicationContext(sc);
headerPreContent = servletConfig.getInitParameter("headerPreContent");
headerScriptSource = servletConfig
.getInitParameter("headerScriptSource");
footerScript = servletConfig.getInitParameter("footerScript");
try
{
boolean logResponse = "true".equalsIgnoreCase(servletConfig
.getInitParameter("log-response"));
TimeLogger.setLogResponse(logResponse);
}
catch (Exception ex)
{
}
try
{
boolean logFullResponse = "true".equalsIgnoreCase(servletConfig
.getInitParameter("log-full-response"));
TimeLogger.setLogFullResponse(logFullResponse);
}
catch (Exception ex)
{
}
String basePath = servletConfig.getServletContext().getRealPath("/");
dispatcher = new MapDispatcher(sc);
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
try {
execute(request, response);
} finally {
RequestScopeSuperBean.clearInstance();
}
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
try {
execute(request, response);
} finally {
RequestScopeSuperBean.clearInstance();
}
}
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;
}
}
log.debug("========================Page Start==========");
request.setAttribute(Tool.NATIVE_URL, Tool.NATIVE_URL);
String targetURL = persistState(request);
String action = request.getParameter ("action");
if (!StringUtils.isEmpty (targetURL) && !StringUtils.equals (action, "search") && !StringUtils.equals (action, "full_search"))
{
response.sendRedirect(targetURL);
return;
}
// Must be done on every request
prePopulateRealm(request);
addWikiStylesheet(request);
request.setAttribute("footerScript", footerScript);
if ( headerScriptSource != null && headerScriptSource.length() > 0 )
{
request.setAttribute("headerScriptSource", headerScriptSource);
}
RequestHelper helper = (RequestHelper) wac.getBean(RequestHelper.class
.getName());
HttpCommand command = helper.getCommandForRequest(request);
// fix for IE6's poor cache capabilities
String userAgent = request.getHeader("User-Agent");
if ( userAgent != null && userAgent.indexOf("MSIE 6") >= 0 ) {
response.addHeader("Expires","0");
response.addHeader("Pragma","cache");
response.addHeader("Cache-Control","private");
}
command.execute(dispatcher,request, response);
request.removeAttribute(Tool.NATIVE_URL);
log.debug("=====================Page End=============");
}
public void prePopulateRealm(HttpServletRequest request)
{
RequestScopeSuperBean rssb = RequestScopeSuperBean.createAndAttach(
request, wac);
PrePopulateBean ppBean = rssb.getPrePopulateBean();
ppBean.doPrepopulate();
}
public void addWikiStylesheet(HttpServletRequest request)
{
String sakaiHeader = (String) request.getAttribute("sakai.html.head");
request.setAttribute("sakai.html.head", headerPreContent + sakaiHeader);
}
/**
* 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))
{
if (log.isDebugEnabled())
{
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());
if (log.isDebugEnabled())
{
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
*/
// XXX this should not be here!! The RequestHelper should perform this
// functionality.
private boolean isPageToolDefault(HttpServletRequest request)
{
// SAK-13408 - Tomcat and WAS have different URL structures; Attempting to add a
// link or image would lead to site unavailable errors in websphere if the tomcat
// URL structure is used.
if("websphere".equals(ServerConfigurationService.getString("servlet.container"))){
String tid = org.sakaiproject.tool.cover.ToolManager.getCurrentPlacement().getId();
if ( request.getPathInfo() != null && request.getPathInfo().startsWith("/tool/" + tid + "/helper/") ) {
return false;
}
}
else {
if ( request.getPathInfo() != null && request.getPathInfo().startsWith("/helper/") ) {
return false;
}
}
String action = request.getParameter(RequestHelper.ACTION);
if (action != null && action.length() > 0) {
return false;
}
String pageName = request.getParameter(ViewBean.PAGE_NAME_PARAM);
if (pageName == null || pageName.trim().length() == 0) {
return true;
} else {
return false;
}
}
/**
* 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 (RequestHelper.TITLE_PANEL.equals(request
.getParameter(RequestHelper.PANEL))) return false;
if (WikiPageAction.PUBLICVIEW_ACTION.getName().equals(
request.getParameter(RequestHelper.ACTION))) return false;
if (WikiPageAction.PRINTVIEW_ACTION.getName().equals(
request.getParameter(RequestHelper.ACTION))) return false;
if ("GET".equalsIgnoreCase(request.getMethod())) return true;
return false;
}
}