http.java

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/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

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

public class HTTP {
  public static final String SERVER_INFO = "JNP-HTTPD/1.0";
  public static final String CGI_BIN = "/cgi-bin/";
  public static final String CLASS_BIN = "/class-bin/";
  public static final File SERVER_LOCATION =
    new File (System.getProperty ("user.dir"));
  public static final File HTML_ROOT =
    new File (SERVER_LOCATION, "html");
  public static final int PORT = 8888;
  public static final String DEFAULT_INDEX = "index.html";

  public static final String METHOD_GET = "GET";
  public static final String METHOD_POST = "POST";
  public static final String METHOD_HEAD = "HEAD";

  public static final int STATUS_OKAY = 200;
  public static final int STATUS_NO_CONTENT = 204;
  public static final int STATUS_MOVED_PERMANENTLY = 301;
  public static final int STATUS_MOVED_TEMPORARILY = 302;
  public static final int STATUS_BAD_REQUEST = 400;
  public static final int STATUS_FORBIDDEN = 403;
  public static final int STATUS_NOT_FOUND = 404;
  public static final int STATUS_NOT_ALLOWED = 405;
  public static final int STATUS_INTERNAL_ERROR = 500;
  public static final int STATUS_NOT_IMPLEMENTED = 501;

  public static String getCodeMessage (int code) {
    switch (code) {
      case STATUS_OKAY: return "OK";
      case STATUS_NO_CONTENT: return "No Content";
      case STATUS_MOVED_PERMANENTLY: return "Moved Permanently";
      case STATUS_MOVED_TEMPORARILY: return "Moved Temporarily";
      case STATUS_BAD_REQUEST: return "Bad Request";
      case STATUS_FORBIDDEN: return "Forbidden";
      case STATUS_NOT_FOUND: return "Not Found";
      case STATUS_NOT_ALLOWED: return "Method Not Allowed";
      case STATUS_INTERNAL_ERROR: return "Internal Server Error";
      case STATUS_NOT_IMPLEMENTED: return "Not Implemented";
      default: return "Unknown Code (" + code + ")";
    }
  }

  protected static final Vector environment = new Vector ();
  static {
    environment.addElement ("SERVER_SOFTWARE=" + SERVER_INFO);
    environment.addElement ("GATEWAY_INTERFACE=" + "CGI/1.0");
    environment.addElement ("SERVER_PORT=" + PORT);
    environment.addElement ("DOCUMENT_ROOT=" + HTML_ROOT.getPath ());
    try {
      environment.addElement
        ("SERVER_NAME=" + InetAddress.getLocalHost ().getHostName ());
    } catch (UnknownHostException ex) {
      environment.addElement ("SERVER_NAME=localhost");
    }
  }

  public static String canonicalizePath (String path) {
    char[] chars = path.toCharArray ();
    int length = chars.length;
    int idx, odx = 0;
    while ((idx = indexOf (chars, length, '/', odx)) < length - 1) {
      int ndx = indexOf (chars, length, '/', idx + 1), kill = -1;
      if (ndx == idx + 1) {
        kill = 1;
      } else if ((ndx >= idx + 2) && (chars[idx + 1] == '.')) {
        if (ndx == idx + 2) {
          kill = 2;
        } else if ((ndx == idx + 3) && (chars[idx + 2] == '.')) {
          kill = 3;
          while ((idx > 0) && (chars[-- idx] != '/'))
            ++ kill;
        }
      }
      if (kill == -1) {
        odx = ndx;
      } else if (idx + kill >= length) {
        length = odx = idx + 1;
      } else {
        length -= kill;
        System.arraycopy (chars, idx + 1 + kill,
                          chars, idx + 1, length - idx - 1);
        odx = idx;
      }
    }
    return new String (chars, 0, length);
  }

  protected static int indexOf (char[] chars, int length, char chr, int from) {
    while ((from < length) && (chars[from] != chr))
      ++ from;
    return from;
  }

  public static String translateFilename (String filename) {
    StringBuffer result = new StringBuffer ();
    int idx, odx = 0;
    while ((idx = filename.indexOf ('/', odx)) != -1) {
      result.append (filename.substring (odx, idx)).append (File.separator);
      odx = idx + 1;
    }
    result.append (filename.substring (odx));
    return result.toString ();
  }

  public static String decodeString (String str) {
    String replaced = str.replace ('+', ' ');
    StringBuffer result = new StringBuffer ();
    int idx, odx = 0;
    while ((idx = str.indexOf ('%', odx)) != -1) {
      result.append (replaced.substring (odx, idx));
      try {
        result.append ((char) Integer.parseInt
                       (str.substring (idx + 1, idx + 3), 16));
      } catch (NumberFormatException ex) {
      }
      odx = idx + 3;
    }
    result.append (replaced.substring (odx));
    return result.toString ();
  }

  protected static final Hashtable mimeTypes = new Hashtable ();
  static {
    mimeTypes.put ("gif", "image/gif");
    mimeTypes.put ("jpeg", "image/jpeg");
    mimeTypes.put ("jpg", "image/jpeg");
    mimeTypes.put ("html", "text/html");
    mimeTypes.put ("htm", "text/html");
  }
  
  public static String guessMimeType (String fileName) {
    int i = fileName.lastIndexOf (".");
    String type = (String) mimeTypes.get (
      fileName.substring (i + 1).toLowerCase ());
    return (type != null) ? type : "text/plain";
  }
}