140 lines
4.2 KiB
Java
140 lines
4.2 KiB
Java
/**
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*
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* Copyright the original author or authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.proxy;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.StringReader;
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import java.net.HttpURLConnection;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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/**
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* HTTP Proxy Socket Connection which connects the socket using a HTTP Proxy.
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*
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* @author Atul Aggarwal
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*/
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class HTTPProxySocketConnection implements ProxySocketConnection {
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private final ProxyInfo proxy;
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HTTPProxySocketConnection(ProxyInfo proxy)
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{
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this.proxy = proxy;
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}
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@Override
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public void connect(Socket socket, String host, int port, int timeout)
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throws IOException {
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String proxyhost = proxy.getProxyAddress();
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int proxyPort = proxy.getProxyPort();
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socket.connect(new InetSocketAddress(proxyhost, proxyPort));
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String hostport = "CONNECT " + host + ":" + port;
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String proxyLine;
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String username = proxy.getProxyUsername();
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if (username == null)
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{
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proxyLine = "";
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}
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else
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{
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String password = proxy.getProxyPassword();
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proxyLine = "\r\nProxy-Authorization: Basic " + Base64.encode(username + ":" + password);
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}
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socket.getOutputStream().write((hostport + " HTTP/1.1\r\nHost: "
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+ hostport + proxyLine + "\r\n\r\n").getBytes("UTF-8"));
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InputStream in = socket.getInputStream();
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StringBuilder got = new StringBuilder(100);
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int nlchars = 0;
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while (true)
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{
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int inByte = in.read();
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if (inByte == -1)
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{
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throw new ProxyException(ProxyInfo.ProxyType.HTTP);
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}
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char c = (char) inByte;
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got.append(c);
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if (got.length() > 1024)
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{
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throw new ProxyException(ProxyInfo.ProxyType.HTTP, "Recieved " +
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"header of >1024 characters from "
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+ proxyhost + ", cancelling connection");
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}
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if ((nlchars == 0 || nlchars == 2) && c == '\r')
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{
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nlchars++;
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}
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else if ((nlchars == 1 || nlchars == 3) && c == '\n')
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{
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nlchars++;
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}
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else
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{
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nlchars = 0;
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}
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if (nlchars == 4)
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{
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break;
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}
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}
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if (nlchars != 4)
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{
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throw new ProxyException(ProxyInfo.ProxyType.HTTP, "Never " +
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"received blank line from "
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+ proxyhost + ", cancelling connection");
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}
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String gotstr = got.toString();
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BufferedReader br = new BufferedReader(new StringReader(gotstr));
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String response = br.readLine();
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if (response == null)
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{
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throw new ProxyException(ProxyInfo.ProxyType.HTTP, "Empty proxy " +
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"response from " + proxyhost + ", cancelling");
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}
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Matcher m = RESPONSE_PATTERN.matcher(response);
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if (!m.matches())
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{
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throw new ProxyException(ProxyInfo.ProxyType.HTTP , "Unexpected " +
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"proxy response from " + proxyhost + ": " + response);
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}
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int code = Integer.parseInt(m.group(1));
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if (code != HttpURLConnection.HTTP_OK)
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{
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throw new ProxyException(ProxyInfo.ProxyType.HTTP);
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}
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}
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private static final Pattern RESPONSE_PATTERN
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= Pattern.compile("HTTP/\\S+\\s(\\d+)\\s(.*)\\s*");
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}
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