view flys-client/src/main/java/de/intevation/flys/client/server/ProxyServlet.java @ 4241:49cb65d5932d

Improved the historical discharge calculation. The calculation now creates new HistoricalWQKms (new subclass of WQKms). Those WQKms are used to create new facets from (new) type 'HistoricalDischargeCurveFacet'. The chart generator is improved to support those facets.
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 24 Oct 2012 14:34:35 +0200
parents 92239b53823f
children
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package de.intevation.flys.client.server;

import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;

import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.log4j.Logger;

import de.intevation.flys.client.server.auth.User;

/**
 * Implements a Proxy for HTTP Requests
 */
public class ProxyServlet
extends HttpServlet
{
    private static Logger logger = Logger.getLogger(ProxyServlet.class);
    private String remoteurl;

    @Override
    public void init(ServletConfig config) {
        this.remoteurl = config.getInitParameter("remoteurl");
    }

    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse resp) {
    }

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp)
    throws IOException {
        HttpClient httpclient = new DefaultHttpClient();

        String requesturi = req.getRequestURI();
        String query = req.getQueryString();

        HttpGet httpget = new HttpGet(this.remoteurl + "?" + query);

        boolean debug = logger.isDebugEnabled();

        for (Enumeration e = req.getHeaderNames(); e.hasMoreElements();) {
            String name = (String)e.nextElement();
            for (Enumeration f = req.getHeaders(name); f.hasMoreElements();) {
                String value = (String)f.nextElement();
                if (debug) {
                    logger.debug(
                        "Adding request header " + name + " : " + value);
                }
                httpget.addHeader(name, value);
            }
        }

        HttpResponse response = httpclient.execute(httpget);

        StatusLine statusline = response.getStatusLine();
        if (debug) {
            logger.debug("Response statuscode " + statusline.getStatusCode());
        }
        resp.setStatus(statusline.getStatusCode());

        Header[] headers = response.getAllHeaders();
        for(Header header : headers) {
            if (debug) {
                logger.debug(
                    "Adding response header " + header.getName() +
                    " : " + header.getValue());
            }
            resp.setHeader(header.getName(), header.getValue());
        }

        HttpEntity entity = response.getEntity();
        if (entity != null) {
            InputStream instream = entity.getContent();
            byte [] buf = new byte[4096];
            try {
                OutputStream outstream = resp.getOutputStream();
                try {
                    int read;
                    while ((read = instream.read(buf)) >= 0) {
                        outstream.write(buf, 0, read);
                    }
                    outstream.flush();
                }
                finally {
                    outstream.close();
                }
            }
            finally {
                instream.close();
            }
        }
    }

    private User getUser(HttpServletRequest req) {
            HttpSession session = req.getSession();
            return (User)session.getAttribute("user");
    }
}

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