| // |
| // ======================================================================== |
| // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.servlets; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import javax.servlet.RequestDispatcher; |
| 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.eclipse.jetty.util.URIUtil; |
| |
| /** |
| * <p>This servlet may be used to concatenate multiple resources into |
| * a single response.</p> |
| * <p>It is intended to be used to load multiple |
| * javascript or css files, but may be used for any content of the |
| * same mime type that can be meaningfully concatenated.</p> |
| * <p>The servlet uses {@link RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)} |
| * to combine the requested content, so dynamically generated content |
| * may be combined (Eg engine.js for DWR).</p> |
| * <p>The servlet uses parameter names of the query string as resource names |
| * relative to the context root. So these script tags:</p> |
| * <pre> |
| * <script type="text/javascript" src="../js/behaviour.js"></script> |
| * <script type="text/javascript" src="../js/ajax.js"></script> |
| * <script type="text/javascript" src="../chat/chat.js"></script> |
| * </pre> |
| * <p>can be replaced with the single tag (with the {@code ConcatServlet} |
| * mapped to {@code /concat}):</p> |
| * <pre> |
| * <script type="text/javascript" src="../concat?/js/behaviour.js&/js/ajax.js&/chat/chat.js"></script> |
| * </pre> |
| * <p>The {@link ServletContext#getMimeType(String)} method is used to determine the |
| * mime type of each resource. If the types of all resources do not match, then a 415 |
| * UNSUPPORTED_MEDIA_TYPE error is returned.</p> |
| * <p>If the init parameter {@code development} is set to {@code true} then the servlet |
| * will run in development mode and the content will be concatenated on every request.</p> |
| * <p>Otherwise the init time of the servlet is used as the lastModifiedTime of the combined content |
| * and If-Modified-Since requests are handled with 304 NOT Modified responses if |
| * appropriate. This means that when not in development mode, the servlet must be |
| * restarted before changed content will be served.</p> |
| */ |
| public class ConcatServlet extends HttpServlet |
| { |
| private boolean _development; |
| private long _lastModified; |
| |
| @Override |
| public void init() throws ServletException |
| { |
| _lastModified = System.currentTimeMillis(); |
| _development = Boolean.parseBoolean(getInitParameter("development")); |
| } |
| |
| /* |
| * @return The start time of the servlet unless in development mode, in which case -1 is returned. |
| */ |
| @Override |
| protected long getLastModified(HttpServletRequest req) |
| { |
| return _development ? -1 : _lastModified; |
| } |
| |
| @Override |
| protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException |
| { |
| String query = request.getQueryString(); |
| if (query == null) |
| { |
| response.sendError(HttpServletResponse.SC_NO_CONTENT); |
| return; |
| } |
| |
| List<RequestDispatcher> dispatchers = new ArrayList<>(); |
| String[] parts = query.split("\\&"); |
| String type = null; |
| for (String part : parts) |
| { |
| String path = URIUtil.canonicalPath(URIUtil.decodePath(part)); |
| if (path == null) |
| { |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| // Verify that the path is not protected. |
| if (startsWith(path, "/WEB-INF/") || startsWith(path, "/META-INF/")) |
| { |
| response.sendError(HttpServletResponse.SC_NOT_FOUND); |
| return; |
| } |
| |
| String t = getServletContext().getMimeType(path); |
| if (t != null) |
| { |
| if (type == null) |
| { |
| type = t; |
| } |
| else if (!type.equals(t)) |
| { |
| response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE); |
| return; |
| } |
| } |
| |
| RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(path); |
| if (dispatcher != null) |
| dispatchers.add(dispatcher); |
| } |
| |
| if (type != null) |
| response.setContentType(type); |
| |
| for (RequestDispatcher dispatcher : dispatchers) |
| dispatcher.include(request, response); |
| } |
| |
| private boolean startsWith(String path, String prefix) |
| { |
| // Case insensitive match. |
| return prefix.regionMatches(true, 0, path, 0, prefix.length()); |
| } |
| } |