/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Axis" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.jboss.axis.security.simple;

import org.jboss.axis.Constants;
import org.jboss.axis.MessageContext;
import org.jboss.axis.security.AuthenticatedUser;
import org.jboss.axis.security.SecurityProvider;
import org.jboss.axis.utils.Messages;
import org.jboss.logging.Logger;

import java.io.File;
import java.io.FileReader;
import java.io.LineNumberReader;
import java.util.HashMap;
import java.util.StringTokenizer;

/**
 * SimpleSecurityProvider
 *
 * @author Glen Daniels (gdaniels@macromedia.com)
 */
public class SimpleSecurityProvider implements SecurityProvider
{
   private static Logger log = Logger.getLogger(SimpleSecurityProvider.class.getName());

   HashMap users = null;
   HashMap perms = null;

   boolean initialized = false;

   // load the users list
   private synchronized void initialize(MessageContext msgContext)
   {
      if (initialized) return;

      String configPath = msgContext.getStrProp(Constants.MC_CONFIGPATH);
      if (configPath == null)
      {
         configPath = "";
      }
      else
      {
         configPath += File.separator;
      }
      File userFile = new File(configPath + "users.lst");
      if (userFile.exists())
      {
         users = new HashMap();

         try
         {

            FileReader fr = new FileReader(userFile);
            LineNumberReader lnr = new LineNumberReader(fr);
            String line = null;

            // parse lines into user and passwd tokens and add result to hash table
            while ((line = lnr.readLine()) != null)
            {
               StringTokenizer st = new StringTokenizer(line);
               if (st.hasMoreTokens())
               {
                  String userID = st.nextToken();
                  String passwd = (st.hasMoreTokens()) ? st.nextToken() : "";

                  if (log.isDebugEnabled())
                  {
                     log.debug(Messages.getMessage("fromFile00",
                             userID, passwd));
                  }

                  users.put(userID, passwd);
               }
            }

            lnr.close();

         }
         catch (Exception e)
         {
            log.error(Messages.getMessage("exception00"), e);
            return;
         }
      }
      initialized = true;
   }

   /**
    * Authenticate a user from a username/password pair.
    *
    * @param username the user name to check
    * @param password the password to check
    * @return an AuthenticatedUser or null
    */
   public AuthenticatedUser authenticate(MessageContext msgContext)
   {

      if (!initialized)
      {
         initialize(msgContext);
      }

      String username = msgContext.getUsername();
      String password = msgContext.getPassword();

      if (users != null)
      {
         if (log.isDebugEnabled())
         {
            log.debug(Messages.getMessage("user00", username));
         }

         // in order to authenticate, the user must exist
         if (username == null ||
                 username.equals("") ||
                 !users.containsKey(username))
            return null;

         String valid = (String)users.get(username);

         if (log.isDebugEnabled())
         {
            log.debug(Messages.getMessage("password00", password));
         }

         // if a password is defined, then it must match
         if (valid.length() > 0 && !valid.equals(password))
            return null;

         if (log.isDebugEnabled())
         {
            log.debug(Messages.getMessage("auth00", username));
         }

         return new SimpleAuthenticatedUser(username);
      }

      return null;
   }

   /**
    * See if a user matches a principal name.  The name might be a user
    * or a group.
    *
    * @return true if the user matches the passed name
    */
   public boolean userMatches(AuthenticatedUser user, String principal)
   {
      if (user == null) return principal == null;
      return user.getName().compareToIgnoreCase(principal) == 0;
   }
}