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/**
* $RCSfile$
* $Revision$
* $Date$
*
* All rights reserved. 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.jivesoftware.smack.proxy;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.net.SocketFactory;
import org.jivesoftware.smack.util.StringUtils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Http Proxy Socket Factory which returns socket connected to Http Proxy
*
* @author Atul Aggarwal
*/
class HTTPProxySocketFactory
extends SocketFactory
{
private ProxyInfo proxy;
public HTTPProxySocketFactory(ProxyInfo proxy)
{
this.proxy = proxy;
}
public Socket createSocket(String host, int port)
throws IOException, UnknownHostException
{
return httpProxifiedSocket(host, port);
}
public Socket createSocket(String host ,int port, InetAddress localHost,
int localPort)
throws IOException, UnknownHostException
{
return httpProxifiedSocket(host, port);
}
public Socket createSocket(InetAddress host, int port)
throws IOException
{
return httpProxifiedSocket(host.getHostAddress(), port);
}
public Socket createSocket( InetAddress address, int port,
InetAddress localAddress, int localPort)
throws IOException
{
return httpProxifiedSocket(address.getHostAddress(), port);
}
private Socket httpProxifiedSocket(String host, int port)
throws IOException
{
String proxyhost = proxy.getProxyAddress();
int proxyPort = proxy.getProxyPort();
Socket socket = new Socket(proxyhost,proxyPort);
String hostport = "CONNECT " + host + ":" + port;
String proxyLine;
String username = proxy.getProxyUsername();
if (username == null)
{
proxyLine = "";
}
else
{
String password = proxy.getProxyPassword();
proxyLine = "\r\nProxy-Authorization: Basic " + StringUtils.encodeBase64(username + ":" + password);
}
socket.getOutputStream().write((hostport + " HTTP/1.1\r\nHost: "
+ hostport + proxyLine + "\r\n\r\n").getBytes("UTF-8"));
InputStream in = socket.getInputStream();
StringBuilder got = new StringBuilder(100);
int nlchars = 0;
while (true)
{
char c = (char) in.read();
got.append(c);
if (got.length() > 1024)
{
throw new ProxyException(ProxyInfo.ProxyType.HTTP, "Recieved " +
"header of >1024 characters from "
+ proxyhost + ", cancelling connection");
}
if (c == -1)
{
throw new ProxyException(ProxyInfo.ProxyType.HTTP);
}
if ((nlchars == 0 || nlchars == 2) && c == '\r')
{
nlchars++;
}
else if ((nlchars == 1 || nlchars == 3) && c == '\n')
{
nlchars++;
}
else
{
nlchars = 0;
}
if (nlchars == 4)
{
break;
}
}
if (nlchars != 4)
{
throw new ProxyException(ProxyInfo.ProxyType.HTTP, "Never " +
"received blank line from "
+ proxyhost + ", cancelling connection");
}
String gotstr = got.toString();
BufferedReader br = new BufferedReader(new StringReader(gotstr));
String response = br.readLine();
if (response == null)
{
throw new ProxyException(ProxyInfo.ProxyType.HTTP, "Empty proxy " +
"response from " + proxyhost + ", cancelling");
}
Matcher m = RESPONSE_PATTERN.matcher(response);
if (!m.matches())
{
throw new ProxyException(ProxyInfo.ProxyType.HTTP , "Unexpected " +
"proxy response from " + proxyhost + ": " + response);
}
int code = Integer.parseInt(m.group(1));
if (code != HttpURLConnection.HTTP_OK)
{
throw new ProxyException(ProxyInfo.ProxyType.HTTP);
}
return socket;
}
private static final Pattern RESPONSE_PATTERN
= Pattern.compile("HTTP/\\S+\\s(\\d+)\\s(.*)\\s*");
}
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