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/**
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* '$RCSfile$'
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* Purpose: A Class that tracks sessions for MetaCatServlet users.
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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* Release: @release@
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*
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* '$Author: jones $'
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* '$Date: 2003-09-17 18:32:33 -0700 (Wed, 17 Sep 2003) $'
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* '$Revision: 1825 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat;
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import java.net.ConnectException;
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import javax.servlet.http.HttpSession;
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import javax.servlet.http.HttpServletRequest;
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/**
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* A Class that implements session tracking for MetaCatServlet users.
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* User's login data are stored in the session object.
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* User authentication is done through a dynamically determined AuthInterface.
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*/
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public class AuthSession {
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private String authClass = null;
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private HttpSession session = null;
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private AuthInterface authService = null;
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private String statusMessage = null;
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/**
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* Construct an AuthSession
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*/
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public AuthSession() throws Exception {
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// Determine our session authentication method and
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// create an instance of the auth class
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MetaCatUtil util = new MetaCatUtil();
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this.authClass = util.getOption("authclass");
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this.authService = (AuthInterface)createObject(authClass);
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}
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/**
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* determine if the credentials for this session are valid by
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* authenticating them using the authService configured for this session.
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*
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* @param request the request made from the client
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* @param username the username entered when login
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* @param password the password entered when login
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*/
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public boolean authenticate(HttpServletRequest request,
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String username, String password) {
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String message = null;
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try {
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if ( authService.authenticate(username, password) ) {
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String[] groups = authService.getGroups(username,password,username);
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if(groups == null)
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{
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groups = new String[0];
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}
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this.session = getSession(request, username, password, groups);
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String sessionId = session.getId();
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message = "Authentication successful for user: " + username;
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this.statusMessage = formatOutput("login", message, sessionId);
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return true;
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} else {
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message = "Authentication failed for user: " + username;
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this.statusMessage = formatOutput("unauth_login", message);
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return false;
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}
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} catch ( ConnectException ce ) {
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message = "Connection to the authentication service failed in " +
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"AuthSession.authenticate: " + ce.getMessage();
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} catch ( IllegalStateException ise ) {
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message = ise.getMessage();
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}
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this.statusMessage = formatOutput("error_login", message);
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return false;
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}
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/** Get new HttpSession and store username & password in it */
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private HttpSession getSession(HttpServletRequest request,
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String username, String password,
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String[] groups)
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throws IllegalStateException {
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// get the current session object, create one if necessary
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HttpSession session = request.getSession(true);
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// if it is still in use invalidate and get a new one
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if ( !session.isNew() ) {
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session.invalidate();
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session = request.getSession(true);
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}
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// store the username, password, and groupname (the first only)
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// in the session obj for use on subsequent calls to Metacat servlet
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session.setMaxInactiveInterval(-1);
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session.setAttribute("username", username);
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session.setAttribute("password", password);
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if ( groups.length > 0 ) {
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session.setAttribute("groupnames", groups);
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}
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return session;
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}
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/**
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* Get the message associated with authenticating this session. The
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* message is formatted in XML.
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*/
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public String getMessage()
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{
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return this.statusMessage;
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}
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/**
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* Get all groups and users from authentication scheme.
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* The output is formatted in XML.
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* @param user the user which requests the information
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* @param password the user's password
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*/
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public String getPrincipals(String user, String password)
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throws ConnectException
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{
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return authService.getPrincipals(user, password);
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}
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/*
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* format the output in xml for processing from client applications
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*
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* @param tag the root element tag for the message (error or success)
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* @param message the message content of the root element
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*/
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private String formatOutput(String tag, String message)
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{
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return formatOutput(tag, message, null);
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}
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/*
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* format the output in xml for processing from client applications
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*
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* @param tag the root element tag for the message (error or success)
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* @param message the message content of the root element
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* @param sessionId the session identifier for a successful login
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*/
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private String formatOutput(String tag, String message, String sessionId)
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{
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StringBuffer out = new StringBuffer();
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out.append("<?xml version=\"1.0\"?>\n");
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out.append("<" + tag + ">");
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out.append("\n <message>" + message + "</message>\n");
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if (sessionId != null) {
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out.append("\n <sessionId>" + sessionId + "</sessionId>\n");
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}
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out.append("</" + tag + ">");
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return out.toString();
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}
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/**
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* Instantiate a class using the name of the class at runtime
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*
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* @param className the fully qualified name of the class to instantiate
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*/
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private static Object createObject(String className) throws Exception {
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Object object = null;
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try {
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Class classDefinition = Class.forName(className);
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object = classDefinition.newInstance();
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} catch (InstantiationException e) {
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throw e;
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} catch (IllegalAccessException e) {
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throw e;
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} catch (ClassNotFoundException e) {
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throw e;
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}
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return object;
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}
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}
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