/**
 * Code is taken from Computer Networking: A Top-Down Approach Featuring 
 * the Internet, second edition, copyright 1996-2002 J.F Kurose and K.W. Ross, 
 * All Rights Reserved.
 **/

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

class WebServer{
    
    public static void main(String argv[]) throws Exception  {
	
	String requestMessageLine;
	String fileName;
	
	ServerSocket listenSocket = new ServerSocket(6789);
	Socket connectionSocket = listenSocket.accept();
	
	BufferedReader inFromClient =
            new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
	DataOutputStream outToClient =
            new DataOutputStream(connectionSocket.getOutputStream());
	
	requestMessageLine = inFromClient.readLine();
	
	StringTokenizer tokenizedLine =
            new StringTokenizer(requestMessageLine);
	
	if (tokenizedLine.nextToken().equals("GET")){
	    
	    fileName = tokenizedLine.nextToken();
	    
	    if (fileName.startsWith("/") == true )
		fileName  = fileName.substring(1);
	    
	    File file = new File(fileName);
	    int numOfBytes = (int) file.length();
	    
	    FileInputStream inFile  = new FileInputStream (fileName);
	    
	    byte[] fileInBytes = new byte[numOfBytes];
	    inFile.read(fileInBytes);
	    
	    outToClient.writeBytes("HTTP/1.0 200 Document Follows\r\n");
	    
	    if (fileName.endsWith(".jpg"))
		outToClient.writeBytes("Content-Type: image/jpeg\r\n");
	    if (fileName.endsWith(".gif"))
		outToClient.writeBytes("Content-Type: image/gif\r\n");
	    
	    outToClient.writeBytes("Content-Length: " + numOfBytes + "\r\n");
	    outToClient.writeBytes("\r\n");
	    
	    outToClient.write(fileInBytes, 0, numOfBytes);
	    
	    connectionSocket.close();
	}
	
	else System.out.println("Bad Request Message");
	
    }
}