package sh.calaba.instrumentationbackend.actions;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URLEncoder;
import java.util.Date;
import java.util.Enumeration;
import java.util.Vector;
import java.util.Hashtable;
import java.util.Locale;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.TimeZone;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;

/**
 * A simple, tiny, nicely embeddable HTTP 1.0 (partially 1.1) server in Java
 *
 * <p> NanoHTTPD version 1.25,
 * Copyright &copy; 2001,2005-2012 Jarno Elonen (elonen@iki.fi, http://iki.fi/elonen/)
 * and Copyright &copy; 2010 Konstantinos Togias (info@ktogias.gr, http://ktogias.gr)
 *
 * <p><b>Features + limitations: </b><ul>
 *
 *    <li> Only one Java file </li>
 *    <li> Java 1.1 compatible </li>
 *    <li> Released as open source, Modified BSD licence </li>
 *    <li> No fixed config files, logging, authorization etc. (Implement yourself if you need them.) </li>
 *    <li> Supports parameter parsing of GET and POST methods (+ rudimentary PUT support in 1.25) </li>
 *    <li> Supports both dynamic content and file serving </li>
 *    <li> Supports file upload (since version 1.2, 2010) </li>
 *    <li> Supports partial content (streaming)</li>
 *    <li> Supports ETags</li>
 *    <li> Never caches anything </li>
 *    <li> Doesn't limit bandwidth, request time or simultaneous connections </li>
 *    <li> Default code serves files and shows all HTTP parameters and headers</li>
 *    <li> File server supports directory listing, index.html and index.htm</li>
 *    <li> File server supports partial content (streaming)</li>
 *    <li> File server supports ETags</li>
 *    <li> File server does the 301 redirection trick for directories without '/'</li>
 *    <li> File server supports simple skipping for files (continue download) </li>
 *    <li> File server serves also very long files without memory overhead </li>
 *    <li> Contains a built-in list of most common mime types </li>
 *    <li> All header names are converted lowercase so they don't vary between browsers/clients </li>
 *
 * </ul>
 *
 * <p><b>Ways to use: </b><ul>
 *
 *    <li> Run as a standalone app, serves files and shows requests</li>
 *    <li> Subclass serve() and embed to your own program </li>
 *    <li> Call serveFile() from serve() with your own base directory </li>
 *
 * </ul>
 *
 * See the end of the source file for distribution license
 * (Modified BSD licence)
 */
public class NanoHTTPD
{
	// ==================================================
	// API parts
	// ==================================================

	/**
	 * Override this to customize the server.<p>
	 *
	 * (By default, this delegates to serveFile() and allows directory listing.)
	 *
	 * @param uri	Percent-decoded URI without parameters, for example "/index.cgi"
	 * @param method	"GET", "POST" etc.
	 * @param parms	Parsed, percent decoded parameters from URI and, in case of POST, data.
	 * @param header	Header entries, percent decoded
	 * @return HTTP response, see class Response for details
	 */
	public Response serve( String uri, String method, Properties header, Properties parms, Properties files )
	{
		myOut.println( method + " '" + uri + "' " );

		Enumeration e = header.propertyNames();
		while ( e.hasMoreElements())
		{
			String value = (String)e.nextElement();
			myOut.println( "  HDR: '" + value + "' = '" +
								header.getProperty( value ) + "'" );
		}
		e = parms.propertyNames();
		while ( e.hasMoreElements())
		{
			String value = (String)e.nextElement();
			myOut.println( "  PRM: '" + value + "' = '" +
								parms.getProperty( value ) + "'" );
		}
		e = files.propertyNames();
		while ( e.hasMoreElements())
		{
			String value = (String)e.nextElement();
			myOut.println( "  UPLOADED: '" + value + "' = '" +
								files.getProperty( value ) + "'" );
		}

		return serveFile( uri, header, myRootDir, true );
	}

	/**
	 * HTTP response.
	 * Return one of these from serve().
	 */
	public class Response
	{
		/**
		 * Default constructor: response = HTTP_OK, data = mime = 'null'
		 */
		public Response()
		{
			this.status = HTTP_OK;
		}

		/**
		 * Basic constructor.
		 */
		public Response( String status, String mimeType, InputStream data )
		{
			this.status = status;
			this.mimeType = mimeType;
			this.data = data;
		}

		/**
		 * Convenience method that makes an InputStream out of
		 * given text.
		 */
		public Response( String status, String mimeType, String txt )
		{
			this.status = status;
			this.mimeType = mimeType;
			try
			{
				this.data = new ByteArrayInputStream( txt.getBytes("UTF-8"));
			}
			catch ( java.io.UnsupportedEncodingException uee )
			{
				uee.printStackTrace();
			}
		}

		/**
		 * Adds given line to the header.
		 */
		public void addHeader( String name, String value )
		{
			header.put( name, value );
		}

		/**
		 * HTTP status code after processing, e.g. "200 OK", HTTP_OK
		 */
		public String status;

		/**
		 * MIME type of content, e.g. "text/html"
		 */
		public String mimeType;

		/**
		 * Data of the response, may be null.
		 */
		public InputStream data;

		/**
		 * Headers for the HTTP response. Use addHeader()
		 * to add lines.
		 */
		public Properties header = new Properties();
	}

	/**
	 * Some HTTP response status codes
	 */
	public static final String
		HTTP_OK = "200 OK",
		HTTP_PARTIALCONTENT = "206 Partial Content",
		HTTP_RANGE_NOT_SATISFIABLE = "416 Requested Range Not Satisfiable",
		HTTP_REDIRECT = "301 Moved Permanently",
		HTTP_NOTMODIFIED = "304 Not Modified",
		HTTP_FORBIDDEN = "403 Forbidden",
		HTTP_NOTFOUND = "404 Not Found",
		HTTP_BADREQUEST = "400 Bad Request",
		HTTP_INTERNALERROR = "500 Internal Server Error",
		HTTP_NOTIMPLEMENTED = "501 Not Implemented";

	/**
	 * Common mime types for dynamic content
	 */
	public static final String
		MIME_PLAINTEXT = "text/plain",
		MIME_HTML = "text/html",
		MIME_DEFAULT_BINARY = "application/octet-stream",
		MIME_XML = "text/xml";

	// ==================================================
	// Socket & server code
	// ==================================================

	/**
	 * Starts a HTTP server to given port.<p>
	 */
	public NanoHTTPD( int port, File wwwroot )
	{
		try {
			myTcpPort = port;
			this.myRootDir = wwwroot;
			myServerSocket = new ServerSocket( myTcpPort );
			myThread = new Thread( new Runnable()
				{
					public void run()
					{
						try
						{
							while( true )
								new HTTPSession( myServerSocket.accept());
						}
						catch ( IOException ioe )
						{}
					}
				});
			myThread.setDaemon( true );
			myThread.start();
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * Stops the server.
	 */
	public void stop()
	{
		try
		{
			myServerSocket.close();
			myThread.join();
		}
		catch ( IOException ioe ) {}
		catch ( InterruptedException e ) {}
	}

	/**
	 * Handles one session, i.e. parses the HTTP request
	 * and returns the response.
	 */
	private class HTTPSession implements Runnable
	{
		public HTTPSession( Socket s )
		{
			mySocket = s;
			Thread t = new Thread( this );
			t.setDaemon( true );
			t.start();
		}

		public void run()
		{
			try
			{
				InputStream is = mySocket.getInputStream();
				if ( is == null) return;

				// Read the first 8192 bytes.
				// The full header should fit in here.
				// Apache's default header limit is 8KB.
				int bufsize = 8192;
				byte[] buf = new byte[bufsize];
				int rlen = is.read(buf, 0, bufsize);
				if (rlen <= 0) return;

				// Create a BufferedReader for parsing the header.
				ByteArrayInputStream hbis = new ByteArrayInputStream(buf, 0, rlen);
				BufferedReader hin = new BufferedReader( new InputStreamReader( hbis ));
				Properties pre = new Properties();
				Properties parms = new Properties();
				Properties header = new Properties();
				Properties files = new Properties();

				// Decode the header into parms and header java properties
				decodeHeader(hin, pre, parms, header);
				String method = pre.getProperty("method");
				String uri = pre.getProperty("uri");

				long size = 0x7FFFFFFFFFFFFFFFl;
				String contentLength = header.getProperty("content-length");
				if (contentLength != null)
				{
					try { size = Integer.parseInt(contentLength); }
					catch (NumberFormatException ex) {}
				}

				// We are looking for the byte separating header from body.
				// It must be the last byte of the first two sequential new lines.
				int splitbyte = 0;
				boolean sbfound = false;
				while (splitbyte < rlen)
				{
					if (buf[splitbyte] == '\r' && buf[++splitbyte] == '\n' && buf[++splitbyte] == '\r' && buf[++splitbyte] == '\n') {
						sbfound = true;
						break;
					}
					splitbyte++;
				}
				splitbyte++;

				// Write the part of body already read to ByteArrayOutputStream f
				ByteArrayOutputStream f = new ByteArrayOutputStream();
				if (splitbyte < rlen) f.write(buf, splitbyte, rlen-splitbyte);

				// While Firefox sends on the first read all the data fitting
				// our buffer, Chrome and Opera sends only the headers even if
				// there is data for the body. So we do some magic here to find
				// out whether we have already consumed part of body, if we
				// have reached the end of the data to be sent or we should
				// expect the first byte of the body at the next read.
				if (splitbyte < rlen)
					size -= rlen - splitbyte +1;
				else if (!sbfound || size == 0x7FFFFFFFFFFFFFFFl)
					size = 0;

				// Now read all the body and write it to f
				buf = new byte[512];
				while ( rlen >= 0 && size > 0 )
				{
					rlen = is.read(buf, 0, 512);
					size -= rlen;
					if (rlen > 0)
						f.write(buf, 0, rlen);
				}

				// Get the raw body as a byte []
				byte [] fbuf = f.toByteArray();

				// Create a BufferedReader for easily reading it as string.
				ByteArrayInputStream bin = new ByteArrayInputStream(fbuf);
				BufferedReader in = new BufferedReader( new InputStreamReader(bin));

				// If the method is POST, there may be parameters
				// in data section, too, read it:
				if ( method.equalsIgnoreCase( "POST" ))
				{
					String contentType = "";
					String contentTypeHeader = header.getProperty("content-type");
					StringTokenizer st = new StringTokenizer( contentTypeHeader , "; " );
					if ( st.hasMoreTokens()) {
						contentType = st.nextToken();
					}

					if (contentType.equalsIgnoreCase("multipart/form-data"))
					{
						// Handle multipart/form-data
						if ( !st.hasMoreTokens())
							sendError( HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but boundary missing. Usage: GET /example/file.html" );
						String boundaryExp = st.nextToken();
						st = new StringTokenizer( boundaryExp , "=" );
						if (st.countTokens() != 2)
							sendError( HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but boundary syntax error. Usage: GET /example/file.html" );
						st.nextToken();
						String boundary = st.nextToken();

						decodeMultipartData(boundary, fbuf, in, parms, files);
					}
					else
					{
						// Handle application/x-www-form-urlencoded
						String postLine = "";
						char pbuf[] = new char[512];
						int read = in.read(pbuf);
						while ( read >= 0 && !postLine.endsWith("\r\n") )
						{
							postLine += String.valueOf(pbuf, 0, read);
							read = in.read(pbuf);
						}
						postLine = postLine.trim();
						decodeParms( postLine, parms );
					}
				}

				if ( method.equalsIgnoreCase( "PUT" ))
					files.put("content", saveTmpFile( fbuf, 0, f.size()));

				// Ok, now do the serve()
				Response r = serve( uri, method, header, parms, files );
				if ( r == null )
					sendError( HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: Serve() returned a null response." );
				else
					sendResponse( r.status, r.mimeType, r.header, r.data );

				in.close();
				is.close();
			}
			catch ( IOException ioe )
			{
				try
				{
					sendError( HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
				}
				catch ( Throwable t ) {}
			}
			catch ( InterruptedException ie )
			{
				// Thrown by sendError, ignore and exit the thread.
			}
		}

		/**
		 * Decodes the sent headers and loads the data into
		 * java Properties' key - value pairs
		**/
		private  void decodeHeader(BufferedReader in, Properties pre, Properties parms, Properties header)
			throws InterruptedException
		{
			try {
				// Read the request line
				String inLine = in.readLine();
				if (inLine == null) return;
				StringTokenizer st = new StringTokenizer( inLine );
				if ( !st.hasMoreTokens())
					sendError( HTTP_BADREQUEST, "BAD REQUEST: Syntax error. Usage: GET /example/file.html" );

				String method = st.nextToken();
				pre.put("method", method);

				if ( !st.hasMoreTokens())
					sendError( HTTP_BADREQUEST, "BAD REQUEST: Missing URI. Usage: GET /example/file.html" );

				String uri = st.nextToken();

				// Decode parameters from the URI
				int qmi = uri.indexOf( '?' );
				if ( qmi >= 0 )
				{
					decodeParms( uri.substring( qmi+1 ), parms );
					uri = decodePercent( uri.substring( 0, qmi ));
				}
				else uri = decodePercent(uri);

				// If there's another token, it's protocol version,
				// followed by HTTP headers. Ignore version but parse headers.
				// NOTE: this now forces header names lowercase since they are
				// case insensitive and vary by client.
				if ( st.hasMoreTokens())
				{
					String line = in.readLine();
					while ( line != null && line.trim().length() > 0 )
					{
						int p = line.indexOf( ':' );
						if ( p >= 0 )
							header.put( line.substring(0,p).trim().toLowerCase(), line.substring(p+1).trim());
						line = in.readLine();
					}
				}

				pre.put("uri", uri);
			}
			catch ( IOException ioe )
			{
				sendError( HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
			}
		}

		/**
		 * Decodes the Multipart Body data and put it
		 * into java Properties' key - value pairs.
		**/
		private void decodeMultipartData(String boundary, byte[] fbuf, BufferedReader in, Properties parms, Properties files)
			throws InterruptedException
		{
			try
			{
				int[] bpositions = getBoundaryPositions(fbuf,boundary.getBytes());
				int boundarycount = 1;
				String mpline = in.readLine();
				while ( mpline != null )
				{
					if (mpline.indexOf(boundary) == -1)
						sendError( HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but next chunk does not start with boundary. Usage: GET /example/file.html" );
					boundarycount++;
					Properties item = new Properties();
					mpline = in.readLine();
					while (mpline != null && mpline.trim().length() > 0)
					{
						int p = mpline.indexOf( ':' );
						if (p != -1)
							item.put( mpline.substring(0,p).trim().toLowerCase(), mpline.substring(p+1).trim());
						mpline = in.readLine();
					}
					if (mpline != null)
					{
						String contentDisposition = item.getProperty("content-disposition");
						if (contentDisposition == null)
						{
							sendError( HTTP_BADREQUEST, "BAD REQUEST: Content type is multipart/form-data but no content-disposition info found. Usage: GET /example/file.html" );
						}
						StringTokenizer st = new StringTokenizer( contentDisposition , "; " );
						Properties disposition = new Properties();
						while ( st.hasMoreTokens())
						{
							String token = st.nextToken();
							int p = token.indexOf( '=' );
							if (p!=-1)
								disposition.put( token.substring(0,p).trim().toLowerCase(), token.substring(p+1).trim());
						}
						String pname = disposition.getProperty("name");
						pname = pname.substring(1,pname.length()-1);

						String value = "";
						if (item.getProperty("content-type") == null) {
							while (mpline != null && mpline.indexOf(boundary) == -1)
							{
								mpline = in.readLine();
								if ( mpline != null)
								{
									int d = mpline.indexOf(boundary);
									if (d == -1)
										value+=mpline;
									else
										value+=mpline.substring(0,d-2);
								}
							}
						}
						else
						{
							if (boundarycount> bpositions.length)
								sendError( HTTP_INTERNALERROR, "Error processing request" );
							int offset = stripMultipartHeaders(fbuf, bpositions[boundarycount-2]);
							String path = saveTmpFile(fbuf, offset, bpositions[boundarycount-1]-offset-4);
							files.put(pname, path);
							value = disposition.getProperty("filename");
							value = value.substring(1,value.length()-1);
							do {
								mpline = in.readLine();
							} while (mpline != null && mpline.indexOf(boundary) == -1);
						}
						parms.put(pname, value);
					}
				}
			}
			catch ( IOException ioe )
			{
				sendError( HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
			}
		}

		/**
		 * Find the byte positions where multipart boundaries start.
		**/
		public int[] getBoundaryPositions(byte[] b, byte[] boundary)
		{
			int matchcount = 0;
			int matchbyte = -1;
			Vector matchbytes = new Vector();
			for (int i=0; i<b.length; i++)
			{
				if (b[i] == boundary[matchcount])
				{
					if (matchcount == 0)
						matchbyte = i;
					matchcount++;
					if (matchcount==boundary.length)
					{
						matchbytes.addElement(new Integer(matchbyte));
						matchcount = 0;
						matchbyte = -1;
					}
				}
				else
				{
					i -= matchcount;
					matchcount = 0;
					matchbyte = -1;
				}
			}
			int[] ret = new int[matchbytes.size()];
			for (int i=0; i < ret.length; i++)
			{
				ret[i] = ((Integer)matchbytes.elementAt(i)).intValue();
			}
			return ret;
		}

		/**
		 * Retrieves the content of a sent file and saves it
		 * to a temporary file.
		 * The full path to the saved file is returned.
		**/
		private String saveTmpFile(byte[] b, int offset, int len)
		{
			String path = "";
			if (len > 0)
			{
				String tmpdir = System.getProperty("java.io.tmpdir");
				try {
					File temp = File.createTempFile("NanoHTTPD", "", new File(tmpdir));
					OutputStream fstream = new FileOutputStream(temp);
					fstream.write(b, offset, len);
					fstream.close();
					path = temp.getAbsolutePath();
				} catch (Exception e) { // Catch exception if any
					myErr.println("Error: " + e.getMessage());
				}
			}
			return path;
		}


		/**
		 * It returns the offset separating multipart file headers
		 * from the file's data.
		**/
		private int stripMultipartHeaders(byte[] b, int offset)
		{
			int i = 0;
			for (i=offset; i<b.length; i++)
			{
				if (b[i] == '\r' && b[++i] == '\n' && b[++i] == '\r' && b[++i] == '\n')
					break;
			}
			return i+1;
		}

		/**
		 * Decodes the percent encoding scheme. <br/>
		 * For example: "an+example%20string" -> "an example string"
		 */
		private String decodePercent( String str ) throws InterruptedException
		{
			try
			{
				StringBuffer sb = new StringBuffer();
				for( int i=0; i<str.length(); i++ )
				{
					char c = str.charAt( i );
					switch ( c )
					{
						case '+':
							sb.append( ' ' );
							break;
						case '%':
							sb.append((char)Integer.parseInt( str.substring(i+1,i+3), 16 ));
							i += 2;
							break;
						default:
							sb.append( c );
							break;
					}
				}
				return sb.toString();
			}
			catch( Exception e )
			{
				sendError( HTTP_BADREQUEST, "BAD REQUEST: Bad percent-encoding." );
				return null;
			}
		}

		/**
		 * Decodes parameters in percent-encoded URI-format
		 * ( e.g. "name=Jack%20Daniels&pass=Single%20Malt" ) and
		 * adds them to given Properties. NOTE: this doesn't support multiple
		 * identical keys due to the simplicity of Properties -- if you need multiples,
		 * you might want to replace the Properties with a Hashtable of Vectors or such.
		 */
		private void decodeParms( String parms, Properties p )
			throws InterruptedException
		{
			if ( parms == null )
				return;

			StringTokenizer st = new StringTokenizer( parms, "&" );
			while ( st.hasMoreTokens())
			{
				String e = st.nextToken();
				int sep = e.indexOf( '=' );
				if ( sep >= 0 )
					p.put( decodePercent( e.substring( 0, sep )).trim(),
						   decodePercent( e.substring( sep+1 )));
			}
		}

		/**
		 * Returns an error message as a HTTP response and
		 * throws InterruptedException to stop further request processing.
		 */
		private void sendError( String status, String msg ) throws InterruptedException
		{
			sendResponse( status, MIME_PLAINTEXT, null, new ByteArrayInputStream( msg.getBytes()));
			throw new InterruptedException();
		}

		/**
		 * Sends given response to the socket.
		 */
		private void sendResponse( String status, String mime, Properties header, InputStream data )
		{
			try
			{
				if ( status == null )
					throw new Error( "sendResponse(): Status can't be null." );

				OutputStream out = mySocket.getOutputStream();
				PrintWriter pw = new PrintWriter( out );
				pw.print("HTTP/1.0 " + status + " \r\n");

				if ( mime != null )
					pw.print("Content-Type: " + mime + "\r\n");

				if ( header == null || header.getProperty( "Date" ) == null )
					pw.print( "Date: " + gmtFrmt.format( new Date()) + "\r\n");

				if ( header != null )
				{
					Enumeration e = header.keys();
					while ( e.hasMoreElements())
					{
						String key = (String)e.nextElement();
						String value = header.getProperty( key );
						pw.print( key + ": " + value + "\r\n");
					}
				}

				pw.print("\r\n");
				pw.flush();

				if ( data != null )
				{
					int pending = data.available();	// This is to support partial sends, see serveFile()
					byte[] buff = new byte[theBufferSize];
					while (pending>0)
					{
						int read = data.read( buff, 0, ( (pending>theBufferSize) ?  theBufferSize : pending ));
						if (read <= 0)	break;
						out.write( buff, 0, read );
						pending -= read;
					}
				}
				out.flush();
				out.close();
				if ( data != null )
					data.close();
			}
			catch( IOException ioe )
			{
				// Couldn't write? No can do.
				try { mySocket.close(); } catch( Throwable t ) {}
			}
		}

		private Socket mySocket;
	}

	/**
	 * URL-encodes everything between "/"-characters.
	 * Encodes spaces as '%20' instead of '+'.
	 */
	private String encodeUri( String uri )
	{
		String newUri = "";
		StringTokenizer st = new StringTokenizer( uri, "/ ", true );
		while ( st.hasMoreTokens())
		{
			String tok = st.nextToken();
			if ( tok.equals( "/" ))
				newUri += "/";
			else if ( tok.equals( " " ))
				newUri += "%20";
			else
			{
				newUri += URLEncoder.encode( tok );
				// For Java 1.4 you'll want to use this instead:
				// try { newUri += URLEncoder.encode( tok, "UTF-8" ); } catch ( java.io.UnsupportedEncodingException uee ) {}
			}
		}
		return newUri;
	}

	private int myTcpPort;
	private final ServerSocket myServerSocket;
	private Thread myThread;
	private File myRootDir;

	// ==================================================
	// File server code
	// ==================================================

	/**
	 * Serves file from homeDir and its' subdirectories (only).
	 * Uses only URI, ignores all headers and HTTP parameters.
	 */
	public Response serveFile( String uri, Properties header, File homeDir,
							   boolean allowDirectoryListing )
	{
		Response res = null;

		// Make sure we won't die of an exception later
		if ( !homeDir.isDirectory())
			res = new Response( HTTP_INTERNALERROR, MIME_PLAINTEXT,
				"INTERNAL ERRROR: serveFile(): given homeDir is not a directory." );

		if ( res == null )
		{
			// Remove URL arguments
			uri = uri.trim().replace( File.separatorChar, '/' );
			if ( uri.indexOf( '?' ) >= 0 )
				uri = uri.substring(0, uri.indexOf( '?' ));

			// Prohibit getting out of current directory
			if ( uri.startsWith( ".." ) || uri.endsWith( ".." ) || uri.indexOf( "../" ) >= 0 )
				res = new Response( HTTP_FORBIDDEN, MIME_PLAINTEXT,
					"FORBIDDEN: Won't serve ../ for security reasons." );
		}

		File f = new File( homeDir, uri );
		if ( res == null && !f.exists())
			res = new Response( HTTP_NOTFOUND, MIME_PLAINTEXT,
				"Error 404, file not found." );

		// List the directory, if necessary
		if ( res == null && f.isDirectory())
		{
			// Browsers get confused without '/' after the
			// directory, send a redirect.
			if ( !uri.endsWith( "/" ))
			{
				uri += "/";
				res = new Response( HTTP_REDIRECT, MIME_HTML,
					"<html><body>Redirected: <a href=\"" + uri + "\">" +
					uri + "</a></body></html>");
				res.addHeader( "Location", uri );
			}

			if ( res == null )
			{
				// First try index.html and index.htm
				if ( new File( f, "index.html" ).exists())
					f = new File( homeDir, uri + "/index.html" );
				else if ( new File( f, "index.htm" ).exists())
					f = new File( homeDir, uri + "/index.htm" );
				// No index file, list the directory if it is readable
				else if ( allowDirectoryListing && f.canRead() )
				{
					String[] files = f.list();
					String msg = "<html><body><h1>Directory " + uri + "</h1><br/>";

					if ( uri.length() > 1 )
					{
						String u = uri.substring( 0, uri.length()-1 );
						int slash = u.lastIndexOf( '/' );
						if ( slash >= 0 && slash  < u.length())
							msg += "<b><a href=\"" + uri.substring(0, slash+1) + "\">..</a></b><br/>";
					}

					if (files!=null)
					{
						for ( int i=0; i<files.length; ++i )
						{
							File curFile = new File( f, files[i] );
							boolean dir = curFile.isDirectory();
							if ( dir )
							{
								msg += "<b>";
								files[i] += "/";
							}

							msg += "<a href=\"" + encodeUri( uri + files[i] ) + "\">" +
								  files[i] + "</a>";

							// Show file size
							if ( curFile.isFile())
							{
								long len = curFile.length();
								msg += " &nbsp;<font size=2>(";
								if ( len < 1024 )
									msg += len + " bytes";
								else if ( len < 1024 * 1024 )
									msg += len/1024 + "." + (len%1024/10%100) + " KB";
								else
									msg += len/(1024*1024) + "." + len%(1024*1024)/10%100 + " MB";

								msg += ")</font>";
							}
							msg += "<br/>";
							if ( dir ) msg += "</b>";
						}
					}
					msg += "</body></html>";
					res = new Response( HTTP_OK, MIME_HTML, msg );
				}
				else
				{
					res = new Response( HTTP_FORBIDDEN, MIME_PLAINTEXT,
						"FORBIDDEN: No directory listing." );
				}
			}
		}

		try
		{
			if ( res == null )
			{
				// Get MIME type from file name extension, if possible
				String mime = null;
				int dot = f.getCanonicalPath().lastIndexOf( '.' );
				if ( dot >= 0 )
					mime = (String)theMimeTypes.get( f.getCanonicalPath().substring( dot + 1 ).toLowerCase());
				if ( mime == null )
					mime = MIME_DEFAULT_BINARY;

				// Calculate etag
				String etag = Integer.toHexString((f.getAbsolutePath() + f.lastModified() + "" + f.length()).hashCode());

				// Support (simple) skipping:
				long startFrom = 0;
				long endAt = -1;
				String range = header.getProperty( "range" );
				if ( range != null )
				{
					if ( range.startsWith( "bytes=" ))
					{
						range = range.substring( "bytes=".length());
						int minus = range.indexOf( '-' );
						try {
							if ( minus > 0 )
							{
								startFrom = Long.parseLong( range.substring( 0, minus ));
								endAt = Long.parseLong( range.substring( minus+1 ));
							}
						}
						catch ( NumberFormatException nfe ) {}
					}
				}

				// Change return code and add Content-Range header when skipping is requested
				long fileLen = f.length();
				if (range != null && startFrom >= 0)
				{
					if ( startFrom >= fileLen)
					{
						res = new Response( HTTP_RANGE_NOT_SATISFIABLE, MIME_PLAINTEXT, "" );
						res.addHeader( "Content-Range", "bytes 0-0/" + fileLen);
						res.addHeader( "ETag", etag);
					}
					else
					{
						if ( endAt < 0 )
							endAt = fileLen-1;
						long newLen = endAt - startFrom + 1;
						if ( newLen < 0 ) newLen = 0;

						final long dataLen = newLen;
						FileInputStream fis = new FileInputStream( f ) {
							public int available() throws IOException { return (int)dataLen; }
						};
						fis.skip( startFrom );

						res = new Response( HTTP_PARTIALCONTENT, mime, fis );
						res.addHeader( "Content-Length", "" + dataLen);
						res.addHeader( "Content-Range", "bytes " + startFrom + "-" + endAt + "/" + fileLen);
						res.addHeader( "ETag", etag);
					}
				}
				else
				{
					if (etag.equals(header.getProperty("if-none-match")))
						res = new Response( HTTP_NOTMODIFIED, mime, "");
					else
					{
						res = new Response( HTTP_OK, mime, new FileInputStream( f ));
						res.addHeader( "Content-Length", "" + fileLen);
						res.addHeader( "ETag", etag);
					}
				}
			}
		}
		catch( IOException ioe )
		{
			res = new Response( HTTP_FORBIDDEN, MIME_PLAINTEXT, "FORBIDDEN: Reading file failed." );
		}

		res.addHeader( "Accept-Ranges", "bytes"); // Announce that the file server accepts partial content requestes
		return res;
	}

	/**
	 * Hashtable mapping (String)FILENAME_EXTENSION -> (String)MIME_TYPE
	 */
	private static Hashtable theMimeTypes = new Hashtable();
	static
	{
		StringTokenizer st = new StringTokenizer(
			"css		text/css "+
			"htm		text/html "+
			"html		text/html "+
			"xml		text/xml "+
			"txt		text/plain "+
			"asc		text/plain "+
			"gif		image/gif "+
			"jpg		image/jpeg "+
			"jpeg		image/jpeg "+
			"png		image/png "+
			"mp3		audio/mpeg "+
			"m3u		audio/mpeg-url " +
			"mp4		video/mp4 " +
			"ogv		video/ogg " +
			"flv		video/x-flv " +
			"mov		video/quicktime " +
			"swf		application/x-shockwave-flash " +
			"js			application/javascript "+
			"pdf		application/pdf "+
			"doc		application/msword "+
			"ogg		application/x-ogg "+
			"zip		application/octet-stream "+
			"exe		application/octet-stream "+
			"class		application/octet-stream " );
		while ( st.hasMoreTokens())
			theMimeTypes.put( st.nextToken(), st.nextToken());
	}

	private static int theBufferSize = 16 * 1024;

	// Change these if you want to log to somewhere else than stdout
	protected static PrintStream myOut = System.out; 
	protected static PrintStream myErr = System.err;

	/**
	 * GMT date formatter
	 */
	private static java.text.SimpleDateFormat gmtFrmt;
	static
	{
		gmtFrmt = new java.text.SimpleDateFormat( "E, d MMM yyyy HH:mm:ss 'GMT'", Locale.US);
		gmtFrmt.setTimeZone(TimeZone.getTimeZone("GMT"));
	}

	/**
	 * The distribution licence
	 */
	private static final String LICENCE =
		"Copyright (C) 2001,2005-2011 by Jarno Elonen <elonen@iki.fi>\n"+
		"and Copyright (C) 2010 by Konstantinos Togias <info@ktogias.gr>\n"+
		"\n"+
		"Redistribution and use in source and binary forms, with or without\n"+
		"modification, are permitted provided that the following conditions\n"+
		"are met:\n"+
		"\n"+
		"Redistributions of source code must retain the above copyright notice,\n"+
		"this list of conditions and the following disclaimer. Redistributions in\n"+
		"binary form must reproduce the above copyright notice, this list of\n"+
		"conditions and the following disclaimer in the documentation and/or other\n"+
		"materials provided with the distribution. The name of the author may not\n"+
		"be used to endorse or promote products derived from this software without\n"+
		"specific prior written permission. \n"+
		" \n"+
		"THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR\n"+
		"IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES\n"+
		"OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n"+
		"IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,\n"+
		"INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\n"+
		"NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n"+
		"DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n"+
		"THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n"+
		"(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n"+
		"OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.";
}