//
// Multithreaded Java WebServer
// (C) 2001 Anders Gidenstam
// (based on a lab in Computer Networking: ..)
//

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

public final class WebServer
{
    public static void main(String argv[]) throws Exception
    {
    // Set port number
    int port = 0;
    
    // Establish the listening socket
    ServerSocket serverSocket = new ServerSocket(port);
    System.out.println("Port number is: "+serverSocket.getLocalPort());

    
    // Wait for and process HTTP service requests
    while (true) {
        // Wait for TCP connection
        Socket requestSocket = serverSocket.accept();
        requestSocket.setSoLinger(true, 5);
        
        // Create an object to handle the request
        HttpRequest request  = new HttpRequest(requestSocket);
        
        //request.run()

        // Create a new thread for the request
        Thread thread = new Thread(request);

        // Start the thread
        thread.start();
    }
  }
}

final class HttpRequest implements Runnable
{
    // Constants
    //   Recognized HTTP methods
    final static class HTTP_METHOD
    {
    final static String GET  = "GET";
    final static String HEAD = "HEAD";
    final static String POST = "POST";
    }

    final static String HTTPVERSION = "HTTP/1.0";
    final static String CRLF = "\r\n";
    Socket socket;

    // Constructor
    public HttpRequest(Socket socket) throws Exception
    {
    this.socket = socket;
    }

    // Implements the run() method of the Runnable interface
    public void run()
    {
    try {
        processRequest();
    } catch (Exception e) {
        System.out.println(e);
    }
    }

    // Process a HTTP request
    private void processRequest() throws Exception
    {
        // Get the input and output streams of the socket.
    InputStream ins       = socket.getInputStream();
    DataOutputStream outs = new DataOutputStream(socket.getOutputStream());

    // Set up input stream filters
    BufferedReader br = new BufferedReader(new InputStreamReader(ins));
    

    // Get the request line of the HTTP request
    String requestLine = br.readLine();
    
    // Display the request line
    System.out.println();
    System.out.println("Request:");
    System.out.println("  " + requestLine);
 
    // Close streams and sockets
    outs.close();
    br.close();
    socket.close();
    }

    private static void sendBytes(FileInputStream  fins,
                  OutputStream     outs) throws Exception
    {
    // Coopy buffer
    byte[] buffer = new byte[1024];
    int    bytes = 0;

    while ((bytes = fins.read(buffer)) != -1) {
        outs.write(buffer, 0, bytes);
    }
    }

    private static String contentType(String fileName)
    {
    if (fileName.toLowerCase().endsWith(".htm") ||
        fileName.toLowerCase().endsWith(".html")) {
        return "text/html";
    } else if (fileName.toLowerCase().endsWith(".gif")) {
        return "image/gif";
    } else if (fileName.toLowerCase().endsWith(".jpg")) {
        return "image/jpeg";
    } else {
        return "application/octet-stream";
    }
    }
}