/*
* 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.isis.core.webapp.content;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
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.isis.core.commons.lang.InputStreamExtensions;
import org.apache.isis.core.commons.lang.ResourceUtil;
import org.apache.isis.core.commons.lang.StringExtensions;
public class ResourceServlet extends HttpServlet {
private static final Logger LOG = LoggerFactory.getLogger(ResourceServlet.class);
private static final long serialVersionUID = 1L;
@Override
protected void doPost(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
processRequest(request, response);
}
private void processRequest(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
final String servletPath = StringExtensions.stripLeadingSlash(request.getServletPath());
if (LOG.isDebugEnabled()) {
LOG.debug("request: " + servletPath);
}
// try to load from filesystem
final InputStream is2 = getRealPath(request);
if (is2 != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("request: " + servletPath + " loaded from filesystem");
}
writeContentType(request, response);
InputStreamExtensions.copyTo(is2, response.getOutputStream());
is2.close();
return;
}
// otherwise, try to load from classpath
final InputStream is = ResourceUtil.getResourceAsStream(servletPath);
if (is != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("request: " + servletPath + " loaded from classpath");
}
writeContentType(request, response);
InputStreamExtensions.copyTo(is, response.getOutputStream());
is.close();
return;
}
LOG.warn("failed to load resource from classpath or file system: " + servletPath);
}
private static void writeContentType(final HttpServletRequest request, final HttpServletResponse response) {
final String contentType = guessContentType(request.getServletPath());
if(contentType != null) {
response.setContentType(contentType);
}
}
private static String guessContentType(String servletPath) {
if(servletPath.endsWith(".css")) {
return "text/css";
} else if(servletPath.endsWith(".png")) {
return "image/png";
} else if(servletPath.endsWith(".jpg")) {
return "image/jpeg";
} else if(servletPath.endsWith(".jpeg")) {
return "image/jpeg";
} else if(servletPath.endsWith(".gif")) {
return "image/gif";
} else if(servletPath.endsWith(".svg")) {
return "image/svg+xml";
} else if(servletPath.endsWith(".js")) {
return "application/x-javascript";
} else if(servletPath.endsWith(".html")) {
return "text/html";
} else if(servletPath.endsWith(".swf")) {
return "application/x-shockwave-flash";
}
return null;
}
private FileInputStream getRealPath(final HttpServletRequest request) {
final String realPath = request.getSession().getServletContext().getRealPath(request.getServletPath());
if (realPath == null) {
return null;
}
try {
return new FileInputStream(realPath);
} catch (final FileNotFoundException e) {
return null;
}
}
}