674 lines
24 KiB
Java
Executable File
674 lines
24 KiB
Java
Executable File
/*
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* Copyright (C) 2001-2004 Red Hat Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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package com.arsdigita.cms.dispatcher;
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import com.arsdigita.cms.ContentItem;
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import com.arsdigita.cms.ContentSection;
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import com.arsdigita.cms.SecurityManager;
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import com.arsdigita.cms.publishToFile.LocalRequestPassword;
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import com.arsdigita.developersupport.DeveloperSupport;
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import com.arsdigita.dispatcher.ChainedDispatcher;
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import com.arsdigita.dispatcher.Dispatcher;
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import com.arsdigita.dispatcher.DispatcherHelper;
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import com.arsdigita.dispatcher.JSPApplicationDispatcher;
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import com.arsdigita.dispatcher.RedirectException;
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import com.arsdigita.dispatcher.RequestContext;
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import com.arsdigita.domain.DataObjectNotFoundException;
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import com.arsdigita.kernel.ACSObjectCache;
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import com.arsdigita.kernel.KernelHelper;
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import com.arsdigita.kernel.SiteNode;
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import com.arsdigita.kernel.User;
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import com.arsdigita.web.LoginSignal;
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import com.arsdigita.web.URL;
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import java.io.File;
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import java.io.IOException;
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import java.util.HashMap;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.log4j.Logger;
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/**
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* <p> The CMS Dispatcher serves all request made within a content section.
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* This dispatcher is called by the Subsite dispatcher.</p>
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*
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* <p>Here are the steps for a request to
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* <tt>http://yourserver/cms/cheese</tt> in excruciating detail:</p>
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*
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* <ol>
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* <li><p>A client sends a request to the web server, which passes it on to
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* the global ACS dispatcher.</p></li>
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*
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* <li><p>The global ACS dispatcher examines the first part of the URL,
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* notices that CMS is mounted at <tt>/cms</tt> and hands the request to
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* the CMS dispatcher.</p></li>
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*
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* <li><p>The CMS dispatcher determines whether a <tt>Page</tt> has been
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* registered to the URL <tt>/cheese</tt> in this section via its
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* {@link com.arsdigita.cms.dispatcher.PageResolver}.</p></li>
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*
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* <li><p>Since no page is registered to the URL, the CMS dispatcher asks
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* the content section (via its
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* {@link com.arsdigita.cms.dispatcher.ItemResolver})
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* for a content item for <tt>/cheese</tt> in this content section. The
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* result of this process is a {@link com.arsdigita.cms.ContentItem}
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* object.</p></li>
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*
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* <li><p>The CMS dispatcher asks the content section for a <tt>Page</tt>
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* to use as the "master template" for this item. The content section may
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* apply item-, type-, or request-specific rules to make this decision
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* (for example, check a user preference for normal or accessible style,
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* or a query parameter for a printable version).</p></li>
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*
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* <li><p>The CMS dispatcher hands the master <tt>Page</tt> object to
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* the {@link com.arsdigita.sitenode.SiteNodePresentationManager}
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* to serve the page.</p></li>
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*
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* <li><p>The presentation manager asks the master <tt>Page</tt> object
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* for an XML document representing the data for the page.</p></li>
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*
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* <li><p>The master template begins walking through its component
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* hierarchy, converting each component to XML by calling its
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* <tt>generateXML</tt> method. The component responsible for rendering
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* the content item uses an
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* {@link com.arsdigita.cms.dispatcher.XMLGenerator} to convert the
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* content item to XML.</p></li>
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*
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* <li><p>The presentation manager receives the completed XML document, and
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* selects an XSL transformer to use for generating the HTML. The
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* stylesheet on which the transformer is based contains templates
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* for all styles and all content types in the content section, in
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* particular those from the file <tt>cms-item.xsl</tt>.</p></li>
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* </ol>
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*
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* @author Michael Pih (pihman@arsdigita.com)
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* @author Uday Mathur (umathur@arsdigita.com)
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* @author Jack Chung (flattop@arsdigita.com)
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* @version $Id: CMSDispatcher.java 1967 2009-08-29 21:05:51Z pboy $
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*/
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public class CMSDispatcher implements Dispatcher, ChainedDispatcher {
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private static Logger s_log =
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Logger.getLogger(CMSDispatcher.class);
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public static final String CONTENT_SECTION
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= "com.arsdigita.cms.dispatcher.section";
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public static final String CONTENT_ITEM
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= "com.arsdigita.cms.dispatcher.item";
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public static final String[] INDEX_FILES = {
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"index.jsp", "index.html", "index.htm" };
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private static final String DEBUG = "/debug";
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private static final String ADMIN_SECTION = "admin";
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public static final String ADMIN_URL = "admin/index";
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/**
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* The context for previewing items
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*/
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public static final String PREVIEW = "preview";
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// Content section cache
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private static HashMap s_pageResolverCache = new HashMap();
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private static HashMap s_itemResolverCache = new HashMap();
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private static HashMap s_xmlGeneratorCache = new HashMap();
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private boolean m_adminPagesOnly = false;
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public CMSDispatcher() {
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this(false);
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}
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public CMSDispatcher(boolean adminOnly) {
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m_adminPagesOnly = adminOnly;
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}
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/**
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* Handles requests made to a CMS package instance.
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* 1) fetches the current content section
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* 2) fetches the resource mapped to the current section/URL
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* 3) if no resource, fetches the item associated with the current
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* section/URL
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* 4) if no item, passes request to the JSP dispatcher, which serves
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* JSP's, HTML pages, and media from the cms/packages/www directory
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*
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* @param request The request
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* @param response The response
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* @param actx The request context
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*/
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public void dispatch(HttpServletRequest request,
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HttpServletResponse response,
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RequestContext actx)
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throws IOException, ServletException {
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if (s_log.isDebugEnabled()) {
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s_log.debug("Dispatching request for " +
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new URL(request).toDebugString());
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}
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DeveloperSupport.startStage("CMSDispatcher.dispatch: get resource");
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// This is the path to the current site node.
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String processedUrl = actx.getProcessedURLPart();
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String webappURLContext = request.getContextPath();
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if (processedUrl.startsWith(webappURLContext)) {
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processedUrl = processedUrl.substring(webappURLContext.length());
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}
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if (s_log.isDebugEnabled()) {
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s_log.debug("Determined the path to the current site node; it " +
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"is '" + processedUrl + "' according to the " +
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"request context");
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}
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// This is the path within the site node.
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String remainingUrl = actx.getRemainingURLPart();
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if ( remainingUrl.endsWith("/") ) {
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remainingUrl = remainingUrl.substring(0, remainingUrl.length() - 1);
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} else if (remainingUrl.endsWith(ItemDispatcher.FILE_SUFFIX)) {
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remainingUrl = remainingUrl.substring
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(0, remainingUrl.length() - ItemDispatcher.FILE_SUFFIX.length());
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} else if (remainingUrl.equals("")) {
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remainingUrl = "index";
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}
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if (s_log.isDebugEnabled()) {
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s_log.debug("Determined the path after the current site node; " +
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"it is '" + remainingUrl + "'");
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}
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// Fetch the current content section.
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ContentSection section = null;
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try {
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section = findContentSection(processedUrl);
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} catch (DataObjectNotFoundException e) {
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throw new ServletException(e);
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}
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request.setAttribute(CONTENT_SECTION, section);
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if (s_log.isDebugEnabled()) {
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s_log.debug("Found content section '" + section + "'");
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}
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// Check user access to this page and deny access if necessary.
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checkUserAccess(request, response, actx);
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// Look for a site-node-specific asset (if any).
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// KG: This hack will be replaced by a ChainedDispatcher
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try {
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s_log.debug("Looking for a site node asset");
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String siteNodeAssetURL = getSiteNodeAsset(request, actx);
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if (siteNodeAssetURL != null) {
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s_log.debug("Site node asset found at '" +
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siteNodeAssetURL + "'");
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DispatcherHelper.cacheDisable(response);
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DispatcherHelper.setRequestContext(request, actx);
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DispatcherHelper.forwardRequestByPath(siteNodeAssetURL,
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request, response);
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return;
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}
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s_log.debug("No site node asset found; proceeding with normal " +
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"dispatching");
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} catch (RedirectException e) {
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throw new ServletException(e);
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}
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// Fetch the requested resource (if any).
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ResourceHandler resource = getResource(section, remainingUrl);
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DeveloperSupport.endStage("CMSDispatcher.dispatch: get resource");
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if (s_log.isDebugEnabled()) {
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s_log.debug("Got a resource '" + resource + "'");
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}
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if (resource != null) {
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if (s_log.isDebugEnabled()) {
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s_log.debug("Found resource '" + remainingUrl + "'; " +
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"dispatching to it");
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}
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s_log.info("resource dispatch for " + remainingUrl);
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// Found resource, now serve it.
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DeveloperSupport.startStage("CMSDispatcher.dispatch: resource.dispatch");
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// NB, ResouceHandler implementations should take care of caching options
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resource.dispatch(request, response, actx);
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DeveloperSupport.endStage("CMSDispatcher.dispatch: resource.dispatch");
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} else {
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if (s_log.isDebugEnabled()) {
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s_log.debug("No resource found at '" + remainingUrl + "'; " +
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"searching for a previewable content item at " +
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"this path");
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}
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DeveloperSupport.startStage("CMSDispatcher.dispatch: item dispatch");
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// If the remaining URL starts with "preview/", then try and
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// preview this item. Otherwise look for the live item.
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boolean preview = false;
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if (remainingUrl.startsWith(PREVIEW)) {
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remainingUrl = remainingUrl.substring(PREVIEW.length());
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preview = true;
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}
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// Check for published / previewable item.
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ContentItem item = null;
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// Check if the user has access to view public pages
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SecurityManager sm = new SecurityManager(section);
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if (sm.canAccess(request, SecurityManager.PUBLIC_PAGES)) {
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if (preview) {
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item = getContentItem(section, remainingUrl, CMSDispatcher.PREVIEW);
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} else {
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item = getContentItem(section, remainingUrl, ContentItem.LIVE);
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}
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if (item != null) {
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request.setAttribute(CONTENT_ITEM, item);
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ACSObjectCache.set(request, item);
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}
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}
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if (item != null) {
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if (s_log.isDebugEnabled()) {
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s_log.debug("Found item " + item + "; serving it");
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}
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DispatcherHelper.cacheDisable(response);
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preview(request, response, actx);
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} else {
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s_log.debug("No item to preview found; falling back to " +
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"JSP dispatcher to look for some concrete " +
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"resource in the file system");
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// If no resource was found, look for a JSP page.
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JSPApplicationDispatcher jsp = JSPApplicationDispatcher.getInstance();
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//DispatcherHelper.cacheDisable(response);
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jsp.dispatch(request, response, actx);
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}
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DeveloperSupport.endStage("CMSDispatcher.dispatch: item dispatch");
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}
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}
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public int chainedDispatch(HttpServletRequest request,
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HttpServletResponse response,
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RequestContext actx)
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throws IOException, ServletException {
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if (m_adminPagesOnly) {
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String url = actx.getRemainingURLPart();
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if (url.endsWith(ItemDispatcher.FILE_SUFFIX)) {
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url = url.substring(0, url.length() -
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ItemDispatcher.FILE_SUFFIX.length());
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} else if (url.endsWith("/")) {
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url = url.substring(0, url.length() - 1);
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}
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if (url.equals(ADMIN_URL)) {
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if (s_log.isInfoEnabled()) {
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s_log.info("Resolving admin URL '" + url + "'");
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}
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dispatch(request, response, actx);
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return ChainedDispatcher.DISPATCH_BREAK;
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} else {
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return ChainedDispatcher.DISPATCH_CONTINUE;
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}
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}
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dispatch(request, response, actx);
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return ChainedDispatcher.DISPATCH_BREAK;
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}
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/**
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* Returns the Security Manager to use for the specified section.
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*
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* @param section The current ContentSection
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**/
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protected SecurityManager getSecurityManager(ContentSection section) {
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return new SecurityManager(section);
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}
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/**
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* Verify that the user is logged in and is able to view the
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* page. Subclasses can override this method if they need to, but
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* should always be sure to call super.checkUserAccess(...)
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*
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* @param request The HTTP request
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* @param response The HTTP response
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* @param actx The request context
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* @exception AccessDeniedException if the user does not have access.
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**/
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protected void checkUserAccess(HttpServletRequest request,
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HttpServletResponse response,
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RequestContext actx)
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throws ServletException, AccessDeniedException {
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User user = KernelHelper.getCurrentUser(request);
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ContentSection section = getContentSection(request);
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SecurityManager sm = getSecurityManager(section);
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if ( isAdminPage(actx.getRemainingURLPart()) ) {
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// Handle admin page requests.
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// If the user is not logged in, redirect to the login page.
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// Otherwise, perform the Admin Pages access check.
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if ( user == null ) {
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redirectToLoginPage(request, response);
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return;
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}
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if ( !sm.canAccess(user, SecurityManager.ADMIN_PAGES ) ) {
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throw new AccessDeniedException(
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"You do not have access to the administrative pages for the " +
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section.getName() + " content section.");
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}
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} else {
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// For public page requests, use the SecurityManager to check access
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// SecurityManager.canAccess(user, SecurityManager.PUBLIC_PAGES) must
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if ( !sm.canAccess(user, SecurityManager.PUBLIC_PAGES) &&
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!LocalRequestPassword.validLocalRequest(request)) {
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throw new AccessDeniedException(
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"You do not have access to the public pages for the " +
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section.getName() + " content section.");
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}
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}
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}
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/**
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* Fetches the content section from the request attributes.
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*
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* @param request The HTTP request
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* @return The content section
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* @pre ( state != null )
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*/
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public static ContentSection getContentSection(HttpServletRequest request) {
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return (ContentSection) request.getAttribute(CONTENT_SECTION);
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}
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/**
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* Fetches the content item from the request attributes.
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*
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* @param request The HTTP request
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* @return The content item
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* @pre ( state != null )
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*/
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public static ContentItem getContentItem(HttpServletRequest request) {
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return (ContentItem) request.getAttribute(CONTENT_ITEM);
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}
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/**
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* Looks up the current content section using the remaining URL
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* stored in the request context object and the SiteNode class.
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*
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* @param url The section URL stub
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* @return The current Content Section
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*/
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protected ContentSection findContentSection(String url)
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throws DataObjectNotFoundException {
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// MP: This is a hack to get the debugging info in
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// SiteNodePresentationManager.servePage, but since it's
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// debugging info...
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// Remove /debug from the start of the URL if it exists.
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if ( url.startsWith(DEBUG) ) {
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url = url.substring(DEBUG.length());
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}
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final String debugXMLString = "/xml";
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if ( url.startsWith(debugXMLString) ) {
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url = url.substring(debugXMLString.length());
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}
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final String debugXSLString = "/xsl";
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if ( url.startsWith(debugXSLString) ) {
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url = url.substring(debugXSLString.length());
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}
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// Fetch the current site node from the URL.
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SiteNode sn = SiteNode.getSiteNode(url);
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ContentSection section = ContentSection.getSectionFromNode(sn);
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return section;
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}
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/**
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* Fetch a resource based on the URL stub.
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*
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* @param section The current content section
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* @param url The section-relative URL
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* @return A ResourceHandler resource or null if none exists.
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* @pre (url != null)
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*/
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protected ResourceHandler getResource(ContentSection section, String url)
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throws ServletException {
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if (s_log.isDebugEnabled()) {
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s_log.debug("Searching for a resource for the URL fragment '" +
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url + "' under " + section);
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}
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final PageResolver pageResolver = CMSDispatcher.getPageResolver
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(section);
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final ResourceHandler handler = pageResolver.getPage(url);
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return handler;
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}
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/**
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* Lookup a content item by section and URL.
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*
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* @param section The content section
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* @param url The URL relative to the content section
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* @param context The use context
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* @return The item associated with the URL, or null if no such item
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* exists
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*/
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protected ContentItem getContentItem(ContentSection section, String url,
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String context)
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throws ServletException {
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ItemResolver itemResolver = CMSDispatcher.getItemResolver(section);
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ContentItem item = null;
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item = itemResolver.getItem(section, url, context);
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return item;
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}
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/**
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* Preview the current content item.
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*
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* @param request The HTTP request
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* @param response The HTTP response
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* @param actx The request context
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*/
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protected void preview(HttpServletRequest request,
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HttpServletResponse response,
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RequestContext actx)
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throws IOException, ServletException {
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ContentSection section = getContentSection(request);
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ContentItem item = getContentItem(request);
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ItemResolver itemResolver = CMSDispatcher.getItemResolver(section);
|
|
CMSPage page = itemResolver.getMasterPage(item, request);
|
|
page.dispatch(request, response, actx);
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* Flushes the page resolver cache.
|
|
*
|
|
* @param section The current content section
|
|
* @param url The section-relative URL
|
|
*/
|
|
public static void releaseResource(ContentSection section, String url) {
|
|
section.getPageResolver().releasePage(url);
|
|
}
|
|
|
|
|
|
/**
|
|
* Fetches the PageResolver for a content section. Checks cache first.
|
|
*
|
|
* @param section The content section
|
|
* @return The PageResolver associated with the content section
|
|
*/
|
|
public static PageResolver getPageResolver(ContentSection section) {
|
|
s_log.debug("Getting the page resolver");
|
|
|
|
final String name = section.getName();
|
|
PageResolver pr = (PageResolver) s_pageResolverCache.get(name);
|
|
|
|
if (pr == null) {
|
|
s_log.debug("The page resolver was not cached; fetching a new " +
|
|
"one and placing it in the cache");
|
|
|
|
pr = section.getPageResolver();
|
|
s_pageResolverCache.put(name, pr);
|
|
}
|
|
|
|
return pr;
|
|
}
|
|
|
|
/**
|
|
* Fetches the ItemResolver for a content section. Checks cache first.
|
|
*
|
|
* @param section The content section
|
|
* @return The ItemResolver associated with the content section
|
|
*/
|
|
public static ItemResolver getItemResolver(ContentSection section) {
|
|
String name = section.getName();
|
|
ItemResolver ir = (ItemResolver) s_itemResolverCache.get(name);
|
|
if ( ir == null ) {
|
|
ir = section.getItemResolver();
|
|
s_itemResolverCache.put(name, ir);
|
|
}
|
|
return ir;
|
|
}
|
|
|
|
/**
|
|
* Fetches the XMLGenerator for a content section. Checks cache first.
|
|
*
|
|
* @param section The content section
|
|
* @return The XMLGenerator associated with the content section
|
|
*/
|
|
public static XMLGenerator getXMLGenerator(ContentSection section) {
|
|
String name = section.getName();
|
|
XMLGenerator xg = (XMLGenerator) s_xmlGeneratorCache.get(name);
|
|
if ( xg == null ) {
|
|
xg = section.getXMLGenerator();
|
|
s_xmlGeneratorCache.put(name, xg);
|
|
}
|
|
|
|
return xg;
|
|
}
|
|
|
|
/**
|
|
* Does this URL correspond to an admin page?
|
|
*/
|
|
protected boolean isAdminPage(String url) {
|
|
|
|
// MP: This is a hack to get the debugging info in
|
|
// SiteNodePresentationManager.servePage, but since it's
|
|
// debugging info...
|
|
// Remove /debug from the start of the URL if it exists.
|
|
if ( url.startsWith(DEBUG) ) {
|
|
url = url.substring(DEBUG.length());
|
|
}
|
|
|
|
return ( url != null &&
|
|
(url.startsWith(ADMIN_SECTION) || url.startsWith(PREVIEW)) );
|
|
}
|
|
|
|
|
|
/**
|
|
* Redirects the client to the login page, setting the return url to
|
|
* the current request URI.
|
|
*
|
|
* @exception ServletException If there is an exception thrown while
|
|
* trying to redirect, wrap that exception in a ServletException
|
|
**/
|
|
protected void redirectToLoginPage(HttpServletRequest req,
|
|
HttpServletResponse resp)
|
|
throws ServletException {
|
|
throw new LoginSignal(req);
|
|
}
|
|
|
|
// modified from JSPApplicationDispatcher
|
|
|
|
private String getSiteNodeAsset(HttpServletRequest request,
|
|
RequestContext actx)
|
|
throws RedirectException {
|
|
|
|
String siteNodeAssetURL = null;
|
|
|
|
ServletContext sctx = actx.getServletContext();
|
|
String processedURL = actx.getProcessedURLPart();
|
|
String remainingURL = actx.getRemainingURLPart();
|
|
// REMOVE THIS HACK ONCE we have working publish to file code in the build
|
|
//String templateRoot = PublishToFile.getDefaultDestinationForType(Template.class);
|
|
String templateRoot = null;
|
|
|
|
/* Allow a graceful early exit if publishToFile is not initialized */
|
|
|
|
if (null == templateRoot) {
|
|
return null;
|
|
}
|
|
|
|
File siteNodeAssetRoot = new File(templateRoot, processedURL);
|
|
File assetFile = new File(siteNodeAssetRoot, remainingURL);
|
|
|
|
String contextPath = request.getContextPath();
|
|
|
|
if (assetFile.isDirectory()) {
|
|
|
|
if (remainingURL.endsWith("/")) {
|
|
throw new RedirectException(actx.getOriginalURL() + "/");
|
|
}
|
|
|
|
for (int i = 0; i < INDEX_FILES.length; i++) {
|
|
File indexFile = new File(assetFile, INDEX_FILES[i]);
|
|
if (indexFile.exists()) {
|
|
assetFile = indexFile;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (assetFile.exists()) {
|
|
siteNodeAssetURL = contextPath + "/" + templateRoot
|
|
+ processedURL + remainingURL;
|
|
}
|
|
|
|
return siteNodeAssetURL;
|
|
}
|
|
}
|