/*
* Copyright (c) 2010 Lockheed Martin Corporation
*
* Licensed 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.eurekastreams.server.service.servlets;
import java.awt.image.RenderedImage;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eurekastreams.server.service.actions.strategies.ImageWriter;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
/**
* Get an Image via a Servlet.
*
*/
public class GetImageServlet extends HttpServlet
{
/**
* Logger.
*/
private Log log = LogFactory.getLog(GetImageServlet.class);
/**
* The spring factory.
*/
private ApplicationContext springContext;
/**
* Serial.
*/
private static final long serialVersionUID = 1L;
/**
* 404 is a magic number, he lived by the sea.
*/
private static final int NOTFOUND = 404;
/**
* 500 is even more special. Treat him right.
*/
private static final int ERROR = 500;
/**
* @see HttpServlet#HttpServlet()
*/
public GetImageServlet()
{
super();
}
/**
* {@inheritDoc}
*/
@Override
protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException,
IOException
{
springContext = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
ImageWriter imageWriter = (ImageWriter) springContext.getBean("imageWriter");
RenderedImage image = imageWriter.read(request.getParameter("img"));
// show a 404 page
if (image == null)
{
httpError(NOTFOUND, response);
}
else
{
BufferedOutputStream bos = null;
ByteArrayOutputStream baos = null;
try
{
baos = new ByteArrayOutputStream();
ImageIO.write(image, "png", baos);
bos = new BufferedOutputStream(response.getOutputStream());
response.setContentType("image/png");
response.setContentLength(baos.toByteArray().length);
bos.write(baos.toByteArray());
}
catch (Exception e)
{
// Tell the user there was some internal server error.\
// 500 - Internal server error.
httpError(ERROR, response);
}
finally
{
if (baos != null)
{
try
{
baos.close();
}
catch (IOException e)
{
log.error(e);
// To late to do anything about it now, we may have already sent some data to user.
}
}
if (bos != null)
{
try
{
bos.close();
}
catch (IOException e)
{
log.error(e);
// To late to do anything about it now, we may have already sent some data to user.
}
}
}
}
}
/**
* Pump out an HTTP error.
*
* @param statusCode
* the status code.
* @param response
* the response.
*/
private void httpError(final int statusCode, final HttpServletResponse response)
{
try
{
response.setStatus(statusCode);
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.append("<html><body><h1>Error Code: " + statusCode + "</h1><body></html>");
writer.flush();
}
catch (IOException e)
{
log.error(e);
}
}
/**
* {@inheritDoc}
*/
@Override
protected void doPost(final HttpServletRequest request, final HttpServletResponse response)
throws ServletException, IOException
{
doGet(request, response);
}
}