/*******************************************************************************
* Copyright (c) 2008, 2010 VMware Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* VMware Inc. - initial contribution
*******************************************************************************/
package org.eclipse.virgo.snaps.core.internal.webapp;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.catalina.util.RequestUtil;
import org.eclipse.virgo.util.io.IOUtils;
/**
* TODO Document StaticResourceServlet
* <p />
*
* <strong>Concurrent Semantics</strong><br />
*
* TODO Document concurrent semantics of StaticResourceServlet
*
*/
public class StaticResourceServlet extends HttpServlet {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
private static final long serialVersionUID = 7966666229126801978L;
/**
* {@inheritDoc}
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// As an alternative of the Tomcat's escaping utility we can use one of the following libraries:
// - org.springframework.web.util.HtmlUtils.htmlEscape(String)
// - org.apache.commons.lang3.StringEscapeUtils.escapeHtml4(String)
String pathInfo = RequestUtil.filter(request.getPathInfo());
try {
URL resource = getServletContext().getResource(pathInfo);
if (resource == null) {
logger.warn("Resource {} not found", pathInfo);
response.sendError(HttpServletResponse.SC_NOT_FOUND, "Resource '" + pathInfo + "' not found.");
} else {
logger.info("Resource {} found", pathInfo);
InputStream input = null;
try {
input = new BufferedInputStream(resource.openStream());
OutputStream output = response.getOutputStream();
byte[] buffer = new byte[4096];
int len;
while ((len = input.read(buffer)) > 0) {
output.write(buffer, 0, len);
}
output.flush();
} finally {
if (input != null) {
IOUtils.closeQuietly(input);
}
}
}
} catch (MalformedURLException e) {
logger.error(String.format("Malformed servlet path %s", pathInfo), e);
throw new ServletException("Malformed servlet path " + pathInfo, e);
}
}
}