| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache 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.apache.org/licenses/LICENSE-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.apache.felix.http.base.internal.service; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.URL; |
| import java.net.URLConnection; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| /** |
| * The resource servlet |
| */ |
| public final class ResourceServlet extends HttpServlet |
| { |
| private static final long serialVersionUID = 1L; |
| |
| /** The path of the resource registration. */ |
| private final String prefix; |
| |
| public ResourceServlet(final String prefix) |
| { |
| this.prefix = prefix; |
| } |
| |
| @Override |
| protected void doGet(final HttpServletRequest req, final HttpServletResponse res) |
| throws ServletException, IOException |
| { |
| final String target = req.getPathInfo(); |
| final String resName = (target == null ? this.prefix : this.prefix + target); |
| |
| final URL url = getServletContext().getResource(resName); |
| |
| if (url == null) |
| { |
| res.sendError(HttpServletResponse.SC_NOT_FOUND); |
| } |
| else |
| { |
| handle(req, res, url, resName); |
| } |
| } |
| |
| private void handle(final HttpServletRequest req, |
| final HttpServletResponse res, final URL url, final String resName) |
| throws IOException |
| { |
| final String contentType = getServletContext().getMimeType(resName); |
| if (contentType != null) |
| { |
| res.setContentType(contentType); |
| } |
| |
| final long lastModified = getLastModified(url); |
| if (lastModified != 0) |
| { |
| res.setDateHeader("Last-Modified", lastModified); |
| } |
| |
| if (!resourceModified(lastModified, req.getDateHeader("If-Modified-Since"))) |
| { |
| res.setStatus(HttpServletResponse.SC_NOT_MODIFIED); |
| } |
| else |
| { |
| copyResource(url, res); |
| } |
| } |
| |
| private long getLastModified(final URL url) |
| { |
| long lastModified = 0; |
| |
| try |
| { |
| final URLConnection conn = url.openConnection(); |
| lastModified = conn.getLastModified(); |
| } |
| catch (final Exception e) |
| { |
| // Do nothing |
| } |
| |
| if (lastModified == 0) |
| { |
| final String filepath = url.getPath(); |
| if (filepath != null) |
| { |
| final File f = new File(filepath); |
| if (f.exists()) |
| { |
| lastModified = f.lastModified(); |
| } |
| } |
| } |
| |
| return lastModified; |
| } |
| |
| private boolean resourceModified(long resTimestamp, long modSince) |
| { |
| modSince /= 1000; |
| resTimestamp /= 1000; |
| |
| return resTimestamp == 0 || modSince == -1 || resTimestamp > modSince; |
| } |
| |
| private void copyResource(final URL url, final HttpServletResponse res) throws IOException |
| { |
| URLConnection conn = null; |
| OutputStream os = null; |
| InputStream is = null; |
| |
| try |
| { |
| conn = url.openConnection(); |
| |
| is = conn.getInputStream(); |
| os = res.getOutputStream(); |
| // FELIX-3987 content length should be set *before* any streaming is done |
| // as headers should be written before the content is actually written... |
| int len = getContentLength(conn); |
| if (len >= 0) |
| { |
| res.setContentLength(len); |
| } |
| |
| byte[] buf = new byte[1024]; |
| int n; |
| |
| while ((n = is.read(buf, 0, buf.length)) >= 0) |
| { |
| os.write(buf, 0, n); |
| } |
| } |
| finally |
| { |
| if (is != null) |
| { |
| is.close(); |
| } |
| |
| if (os != null) |
| { |
| os.close(); |
| } |
| } |
| } |
| |
| private int getContentLength(final URLConnection conn) |
| { |
| int length = -1; |
| |
| length = conn.getContentLength(); |
| if (length < 0) |
| { |
| // Unknown, try whether it is a file, and if so, use the file |
| // API to get the length of the content... |
| String path = conn.getURL().getPath(); |
| if (path != null) |
| { |
| File f = new File(path); |
| // In case more than 2GB is streamed |
| if (f.length() < Integer.MAX_VALUE) |
| { |
| length = (int) f.length(); |
| } |
| } |
| } |
| return length; |
| } |
| } |