/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/metaobj/trunk/metaobj-util/tool-lib/src/java/org/sakaiproject/spring/util/SpringTool.java $
* $Id: SpringTool.java 112474 2012-09-14 20:50:16Z chmaurer@iupui.edu $
***********************************************************************************
*
* Copyright (c) 2004, 2005, 2006, 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.spring.util;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.sakaiproject.tool.api.ActiveTool;
import org.sakaiproject.tool.api.Tool;
import org.sakaiproject.tool.api.ToolException;
import org.sakaiproject.tool.api.ToolSession;
import org.sakaiproject.tool.cover.ActiveToolManager;
import org.sakaiproject.tool.cover.SessionManager;
import org.sakaiproject.util.Web;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;
public class SpringTool extends HttpServlet {
/**
* Our log (commons).
*/
private static Log M_log = LogFactory.getLog(SpringTool.class);
private static final String HELPER_EXT = ".helper";
/**
* The file extension to get to JSF.
*/
protected static final String JSF_EXT = ".osp";
/**
* Session attribute to hold the last view visited.
*/
public static final String LAST_VIEW_VISITED = "sakai.jsf.tool.last.view.visited";
// TODO: Note, these two values must match those in jsf-app's SakaiViewHandler
/**
* Request attribute we set to help the return URL know what extension we (or jsf) add (does not need to be in the URL.
*/
public static final String URL_EXT = "sakai.jsf.tool.URL.ext";
/**
* Request attribute we set to help the return URL know what path we add (does not need to be in the URL.
*/
public static final String URL_PATH = "sakai.jsf.tool.URL.path";
/**
* The default target, as configured.
*/
protected String m_default = null;
/**
* if true, we preserve the last visit per placement / user, and use it if we get a request with no path.
*/
protected boolean m_defaultToLastView = true;
/**
* The folder to the jsf files, as configured. Does not end with a "/".
*/
protected String m_path = null;
private static final String HELPER_SESSION_PREFIX = "session.";
/**
* Compute a target (i.e. the servlet path info, not including folder root or jsf extension) for the case of the actual path being empty.
*
* @return The servlet info path target computed for the case of empty actual path.
*/
protected String computeDefaultTarget(boolean lastVisited) {
// setup for the default view as configured
String target = "/" + m_default;
// if we are doing lastVisit and there's a last-visited view, for this tool placement / user, use that
if (lastVisited) {
ToolSession session = SessionManager.getCurrentToolSession();
String last = (String) session.getAttribute(LAST_VIEW_VISITED);
if (last != null) {
target = last;
}
}
return target;
}
protected String computeDefaultTarget() {
return computeDefaultTarget(m_defaultToLastView);
}
/**
* Shutdown the servlet.
*/
public void destroy() {
M_log.info("destroy");
super.destroy();
}
/**
* Respond to requests.
*
* @param req The servlet request.
* @param res The servlet response.
* @throws ServletException
* @throws IOException
*/
protected void dispatch(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
// NOTE: this is a simple path dispatching, taking the path as the view id = jsp file name for the view,
// with default used if no path and a path prefix as configured.
// TODO: need to allow other sorts of dispatching, such as pulling out drill-down ids and making them
// available to the JSF
// build up the target that will be dispatched to
String target = req.getPathInfo();
// see if we have a helper request
if (sendToHelper(req, res, target)) {
return;
}
// see if we have a resource request - i.e. a path with an extension, and one that is not the JSF_EXT
if (isResourceRequest(target)) {
// get a dispatcher to the path
RequestDispatcher resourceDispatcher = getServletContext().getRequestDispatcher(target);
if (resourceDispatcher != null) {
resourceDispatcher.forward(req, res);
return;
}
}
if ("Title".equals(req.getParameter("panel"))) {
// This allows only one Title JSF for each tool
target = "/title.osp";
}
else {
ToolSession session = SessionManager.getCurrentToolSession();
if (target == null || "/".equals(target)) {
if (!m_defaultToLastView) {
// make sure tool session is clean
session.clearAttributes();
}
target = computeDefaultTarget();
// make sure it's a valid path
if (!target.startsWith("/")) {
target = "/" + target;
}
// now that we've messed with the URL, send a redirect to make it official
res.sendRedirect(Web.returnUrl(req, target));
return;
}
// see if we want to change the specifically requested view
String newTarget = redirectRequestedTarget(target);
// make sure it's a valid path
if (!newTarget.startsWith("/")) {
newTarget = "/" + newTarget;
}
if (!newTarget.equals(target)) {
// now that we've messed with the URL, send a redirect to make it official
res.sendRedirect(Web.returnUrl(req, newTarget));
return;
}
target = newTarget;
// store this
session.setAttribute(LAST_VIEW_VISITED, target);
}
// add the configured folder root and extension (if missing)
target = m_path + target;
// add the default JSF extension (if we have no extension)
int lastSlash = target.lastIndexOf("/");
int lastDot = target.lastIndexOf(".");
if (lastDot < 0 || lastDot < lastSlash) {
target += JSF_EXT;
}
// set the information that can be removed from return URLs
req.setAttribute(URL_PATH, m_path);
req.setAttribute(URL_EXT, ".jsp");
// set the sakai request object wrappers to provide the native, not Sakai set up, URL information
// - this assures that the FacesServlet can dispatch to the proper view based on the path info
req.setAttribute(Tool.NATIVE_URL, Tool.NATIVE_URL);
// TODO: Should setting the HTTP headers be moved up to the portal level as well?
res.setContentType("text/html; charset=UTF-8");
res.addDateHeader("Expires", System.currentTimeMillis() - (1000L * 60L * 60L * 24L * 365L));
res.addDateHeader("Last-Modified", System.currentTimeMillis());
res.addHeader("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0, post-check=0, pre-check=0");
res.addHeader("Pragma", "no-cache");
// dispatch to the target
M_log.debug("dispatching path: " + req.getPathInfo() + " to: " + target + " context: "
+ getServletContext().getServletContextName());
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(target);
dispatcher.forward(req, res);
// restore the request object
req.removeAttribute(Tool.NATIVE_URL);
req.removeAttribute(URL_PATH);
req.removeAttribute(URL_EXT);
}
protected boolean sendToHelper(HttpServletRequest req, HttpServletResponse res, String target) throws ToolException {
String path = req.getPathInfo();
if (path == null) {
path = "/";
}
// 0 parts means the path was just "/", otherwise parts[0] = "", parts[1] = item id, parts[2] if present is "edit"...
String[] parts = path.split("/");
if (parts.length < 2) {
return false;
}
if (!parts[1].endsWith(HELPER_EXT)) {
return false;
}
ToolSession toolSession = SessionManager.getCurrentToolSession();
Enumeration params = req.getParameterNames();
while (params.hasMoreElements()) {
String paramName = (String) params.nextElement();
if (paramName.startsWith(HELPER_SESSION_PREFIX)) {
String attributeName = paramName.substring(HELPER_SESSION_PREFIX.length());
toolSession.setAttribute(attributeName, req.getParameter(paramName));
}
}
// calc helper id
int posEnd = parts[1].lastIndexOf(".");
String helperId = target.substring(1, posEnd + 1);
ActiveTool helperTool = ActiveToolManager.getActiveTool(helperId);
if (toolSession.getAttribute(helperTool.getId() + Tool.HELPER_DONE_URL) == null && !target.equals("/sakai.filepicker.helper")) {
toolSession.setAttribute(helperTool.getId() + Tool.HELPER_DONE_URL,
req.getContextPath() + req.getServletPath() + computeDefaultTarget(true));
}
String context = req.getContextPath() + req.getServletPath() + Web.makePath(parts, 1, 2);
String toolPath = Web.makePath(parts, 2, parts.length);
helperTool.help(req, res, context, toolPath);
return true; // was handled as helper call
}
/**
* Respond to requests.
*
* @param req The servlet request.
* @param res The servlet response.
* @throws ServletException
* @throws IOException
*/
protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
dispatch(req, res);
}
/**
* Respond to requests.
*
* @param req The servlet request.
* @param res The servlet response.
* @throws ServletException
* @throws IOException
*/
protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
dispatch(req, res);
}
/**
* Access the Servlet's information display.
*
* @return servlet information.
*/
public String getServletInfo() {
return "Sakai JSF Tool Servlet";
}
/**
* Initialize the servlet.
*
* @param config The servlet config.
* @throws ServletException
*/
public void init(ServletConfig config) throws ServletException {
super.init(config);
m_default = config.getInitParameter("default");
m_path = config.getInitParameter("path");
m_defaultToLastView = "true".equals(config.getInitParameter("default.last.view"));
// make sure there is no "/" at the end of the path
if (m_path != null && m_path.endsWith("/")) {
m_path = m_path.substring(0, m_path.length() - 1);
}
M_log.info("init: default: " + m_default + " path: " + m_path);
}
/**
* Recognize a path that is a resource request. It must have an "extension", i.e. a dot followed by characters that do not include a slash.
*
* @param path The path to check
* @return true if the path is a resource request, false if not.
*/
protected boolean isResourceRequest(String path) {
// we need some path
if ((path == null) || (path.length() == 0)) {
return false;
}
// we need a last dot
int pos = path.lastIndexOf(".");
if (pos == -1) {
return false;
}
// we need that last dot to be the end of the path, not burried in the path somewhere (i.e. no more slashes after the last dot)
String ext = path.substring(pos);
if (ext.indexOf("/") != -1) {
return false;
}
// we need the ext to not be the JSF_EXT
if (ext.equals(JSF_EXT)) {
return false;
}
// ok, it's a resource request
return true;
}
/**
* Compute a new target (i.e. the servlet path info, not including folder root or jsf extension) if needed based on the requested target.
*
* @param target The servlet path info target requested.
* @return The target we will actually respond with.
*/
protected String redirectRequestedTarget(String target) {
return target;
}
}
/**************************************************************************************************************************************************************************************************************************************************************
* $URL: https://source.sakaiproject.org/svn/metaobj/trunk/metaobj-util/tool-lib/src/java/org/sakaiproject/spring/util/SpringTool.java $
*************************************************************************************************************************************************************************************************************************************************************/