www.pudn.com > jnp-src.rar > HTTP.java

/*
 * 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"; 
  } 
}