HttpProxy.java

/*
 * Jitsi Videobridge, OpenSource video conferencing.
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */

package org.jitsi.videobridge.openfire;

import org.jivesoftware.util.*;

import org.slf4j.*;
import org.slf4j.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletOutputStream;

import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;



public class HttpProxy  extends HttpServlet
{
    private static final Logger Log = LoggerFactory.getLogger(HttpProxy.class);
	public static final long serialVersionUID = 24362462L;

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		try {
			Log.info("HttpProxy - doGet start");

			String url = request.getParameter("url");

			if (url != null) {
				writeHeader(url, response);
				writeGet(url, response.getOutputStream());
			}

		}
		catch(Exception e) {
			Log.info("HttpProxy doGet Error: " + e.toString());
		}
	}


    private void writeHeader(String urlString, HttpServletResponse response)
    {

		try {
			response.setHeader("Expires", "Sat, 6 May 1995 12:00:00 GMT");
			response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
			response.addHeader("Cache-Control", "post-check=0, pre-check=0");
			response.setHeader("Pragma", "no-cache");

			if (urlString.endsWith(".pdf"))
				response.setHeader("Content-Type", "application/pdf");
			else
				response.setHeader("Content-Type", "text/html");

			response.setHeader("Connection", "close");
        }
        catch(Exception e)
        {
			Log.info("HttpProxy writeHeader Error: " + e.toString());
        }
	}


	private void writeGet(String urlString, ServletOutputStream out)
	{
		byte[] buffer = new byte[4096];

		try{
			URL url = new URL(urlString);
			URLConnection urlConn = url.openConnection();
			InputStream inStream = urlConn.getInputStream();
			int n = -1;

			while ( (n = inStream.read(buffer)) != -1)
			{
				out.write(buffer, 0, n);
			}

			out.close();

		} catch(MalformedURLException e){
			Log.info("HttpProxy writeGet MalformedURLException", e);

		} catch(IOException  e1){
			Log.info("HttpProxy writeGet IOException", e1);

		} catch (Exception e2) {
			Log.info("HttpProxy - writeGet Exception", e2);
		}
	}
}