package io.selendroid.standalone.server.support;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
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.net.ServerSocket;
import java.net.Socket;
import java.net.URLEncoder;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Locale;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.TimeZone;
import java.util.Vector;

/**
 * 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, "UTF-8"));

				// 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 if (contentType.toLowerCase().startsWith(
							"application/json")) {
						StringBuffer sb = new StringBuffer();
						String line = null;
						while ((line = in.readLine()) != null) {
							sb.append(line + "\n");
						}
						parms.put("json", sb.toString());
					} 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.";
}
