ABP/Android proxy service

src/org/adblockplus/brazil/SSLConnectionHandler.java

Index: src/org/adblockplus/brazil/SSLConnectionHandler.java
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+package org.adblockplus.brazil;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.util.Properties;
+
+import sunlabs.brazil.server.Handler;
+import sunlabs.brazil.server.Request;
+import sunlabs.brazil.server.Server;
+import sunlabs.brazil.util.MatchString;
+
+/**
+ * <code>RequestHandler</code> implements a SSL tunnel.
+ * 
+ * The following configuration parameters are used to initialize this
+ * <code>Handler</code>:
+ * <dl class=props>
+ * 
+ * <dt>prefix, suffix, glob, match
+ * <dd>Specify the URL that triggers this handler. (See {@link MatchString}).
+ * <dt>auth
+ * <dd>The value of the proxy-authenticate header (if any) sent to the upstream
+ * proxy
+ * <dt>proxyHost
+ * <dd>If specified, the name of the upstream proxy
+ * <dt>proxyPort
+ * <dd>The upstream proxy port, if a proxyHost is specified (defaults to 80)
+ * 
+ * </dl>
+ * 
+ * A sample set of configuration parameters illustrating how to use this
+ * handler follows:
+ * 
+ * <pre>
+ * handler=https
+ * https.class=org.adblockplus.brazil.SSLConnectionHandler
+ * </pre>
+ * 
+ * See the description under {@link sunlabs.brazil.server.Handler#respond
+ * respond} for a more detailed explanation.
+ * 
+ * Original source by Jochen Luell, PAW (http://paw-project.sourceforge.net/)
+ */
+
+public class SSLConnectionHandler implements Handler
+{
+	public static final String PROXY_HOST = "proxyHost";
+	public static final String PROXY_PORT = "proxyPort";
+	public static final String AUTH = "auth";
+
+	private String prefix;
+
+	private String proxyHost;
+	private int proxyPort = 80;
+	private String auth;
+
+	@Override
+	public boolean init(Server server, String prefix)
+	{
+		this.prefix = prefix;
+
+		Properties props = server.props;
+
+		proxyHost = props.getProperty(prefix + PROXY_HOST);
+
+		String s = props.getProperty(prefix + PROXY_PORT);
+		try
+		{
+			proxyPort = Integer.decode(s).intValue();
+		}
+		catch (Exception e)
+		{
+		}
+
+		auth = props.getProperty(prefix + AUTH);
+
+		return true;
+	}
+
+	@Override
+	public boolean respond(Request request) throws IOException
+	{
+		if (!request.method.equals("CONNECT"))
+			return false;
+
+		request.log(Server.LOG_LOG, prefix, "SSL connection to " + request.url);
+
+		String host = null;
+		int port = 0;
+
+		Socket serverSocket;
+		try
+		{
+			if (proxyHost != null)
+			{
+				host = proxyHost;
+				port = proxyPort;
+				if (auth != null)
+				{
+					request.headers.add("Proxy-Authorization", auth);
+				}
+			}
+			else
+			{
+				int c = request.url.indexOf(':');
+				host = request.url.substring(0, c);
+				port = Integer.parseInt(request.url.substring(c+1));
+			}
+
+			// Connect to server or upstream proxy
+			InetAddress addr = InetAddress.getByName(host);
+			serverSocket = new Socket(addr, port);
+		}
+		catch (Exception e)
+		{
+			request.sendError(500, "SSL connection failure");
+			return true;
+		}
+
+		try
+		{
+			if (proxyHost != null)
+			{
+				// Forward request to upstream proxy
+				OutputStream out = serverSocket.getOutputStream();
+				out.write((request.method + " " + request.url + " " + request.protocol + "\r\n").getBytes());
+				request.headers.print(out);
+				out.write("\r\n".getBytes());
+				out.flush();
+			}
+			else
+			{
+				// Send response to client
+				OutputStream out = request.sock.getOutputStream();
+				out.write((request.protocol + " 200 Connection established\r\n\r\n").getBytes());
+				out.flush();
+			}
+
+			// Start bi-directional data transfer
+			ConnectionHandler client = new ConnectionHandler(request.sock, serverSocket);
+			ConnectionHandler server = new ConnectionHandler(serverSocket, request.sock);
+			client.start();
+			server.start();
+
+			// Wait for connections to close
+			client.join();
+			server.join();
+		}
+		catch (InterruptedException e)
+		{
+		    request.log(Server.LOG_ERROR, prefix, "Data exchange error: " + e.getMessage());
+		}
+
+		// Close connection
+		serverSocket.close();
+		request.log(Server.LOG_LOG, prefix, "SSL connection closed");
+
+		return true;
+	}
+
+	private class ConnectionHandler extends Thread
+	{
+		private InputStream in;
+		private OutputStream out;
+
+		ConnectionHandler(Socket sin, Socket sout) throws IOException
+		{
+			in = sin.getInputStream();
+			out = sout.getOutputStream();
+		}
+
+		@Override
+		public void run()
+		{
+			byte[] buf = new byte[4096];
+			int count;
+
+			try
+			{
+				while ((count = in.read(buf, 0, buf.length)) != -1)
+				{
+					out.write(buf, 0, count);
+				}
+				out.flush();
+			}
+			catch (IOException e)
+			{
+				e.printStackTrace();
+			}
+		}
+	}
+}