package net.wastl.webmail.server;

import net.wastl.webmail.xml.*;
import net.wastl.webmail.misc.*;
import net.wastl.webmail.config.*;
import net.wastl.webmail.server.http.*;
import net.wastl.webmail.exceptions.*;

import java.net.*;
import java.util.*;
import javax.mail.*;
import javax.servlet.http.*;

import org.w3c.dom.*;

import org.webengruven.webmail.auth.*;

/**
 * AdminSession.java
 *
 * Created: Thu Sep  9 18:24:05 1999
 *
 * Copyright (C) 2000 Sebastian Schaffert
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
/**
 *
 * @author Sebastian Schaffert
 * @version
 */
/* 9/24/2000 devink -- updated for new challenge/response authentication */
public class AdminSession implements HTTPSession {
    
    /** When has the session been last accessed? */
    private long last_access;
    /** The session-ID for this session */
    private String session_code;
    /** Parent WebMailServer */
    protected WebMailServer parent;
	
    protected InetAddress remote;
    private String remote_agent;
    private String remote_accepts;
	
    protected XMLAdminModel model;
    	
    protected HttpSession sess=null;
	
    protected boolean running_as_servlet=false;

    protected String selected_domain="";
    protected String selected_user="";

    protected boolean is_logged_out=false;
	
    public AdminSession(WebMailServer parent, Object parm, HTTPRequestHeader h) throws InvalidPasswordException, WebMailException {
	try {
	    Class srvltreq=Class.forName("javax.servlet.http.HttpServletRequest");
	    if(srvltreq.isInstance(parm)) {
		running_as_servlet=true;
		javax.servlet.http.HttpServletRequest req=(javax.servlet.http.HttpServletRequest)parm;
		this.sess=req.getSession(false);
		session_code=((javax.servlet.http.HttpSession)sess).getId();
		try {
		    remote=InetAddress.getByName(req.getRemoteHost());
		} catch(UnknownHostException e) {
		    try {
			remote=InetAddress.getByName(req.getRemoteAddr());
		    } catch(Exception ex) {
			try {
			    remote=InetAddress.getByName("localhost");
			} catch(Exception ex2) {}
		    }
		}
	    } else {
		throw new Exception("Running as Servlet but not a valid ServletRequest");
	    }
	} catch(Throwable t) {
	    this.remote=(InetAddress)parm;
	    session_code=Helper.calcSessionCode(remote,h);
	}
	doInit(parent,h);
		
    }
	
    protected void doInit(WebMailServer parent, HTTPRequestHeader h) 
	throws InvalidPasswordException, WebMailException {
	this.parent=parent;
	last_access=System.currentTimeMillis();
	remote_agent=h.getHeader("User-Agent").replace('\n',' ');
	remote_accepts=h.getHeader("Accept").replace('\n',' ');
	//env=new Hashtable();
	model=parent.getStorage().createXMLAdminModel();
	login(h);
	parent.getStorage().log(Storage.LOG_INFO,"WebMail: New Session ("+session_code+")");


	setEnv();
    }
	
    public void login(HTTPRequestHeader h) throws InvalidPasswordException {
	String passwd=parent.getStorage().getConfig("ADMIN PASSWORD");
	if(!Helper.crypt(passwd,h.getContent("password")).equals(passwd)) {
	    throw new InvalidPasswordException();
	}
	login();
	System.err.println("Ok");
    }

    public void login() {
	setLastAccess();
	setEnv();
    }
	
    public void logout() {
	if(!is_logged_out) {
	    if(sess!=null) {
	        try {
		  sess.invalidate();
		} catch(Exception ex) {}
	    }
	    if(parent.getSession(getSessionCode()) != null) {
		parent.removeSession(this);
	    }
	}
	is_logged_out=true;
    }
	
    public boolean isLoggedOut() {
	return is_logged_out;
    }

    public String getSessionCode() {
	return session_code;
    }
	
    public Locale getLocale() {
	return Locale.getDefault();
    }
	
    public long getLastAccess() {
	return last_access;
    }
	
    public void setLastAccess() {
	last_access=System.currentTimeMillis();
    }
	
    public String getEnv(String key) {
	return model.getStateVar(key);
    }
	
	
    public void selectUser(String user) {
      try {
	    selected_user=user;
	    System.err.println("Selecting user "+user);
	    XMLUserData ud=parent.getStorage().getUserData(user,selected_domain,"");
	    System.err.println("Done.");
	    model.importUserData(ud.getUserData());	    
      }
      catch (InvalidPasswordException e) { } 
      catch (UserDataException e) { }
    }
	
    public void clearUser() {
	selected_user="";
	model.clearUserData();
    }

    public void deleteUser(String user) {
	parent.getStorage().deleteUserData(user,selected_domain);
	// Refresh information
	selectDomain(selected_domain);
    }

    /* 10/22/2000 devink -- added to suport new authentication changes. */
    /** This does all the necessary setup to edit the currently selected
     * user.
     */
    public void setupUserEdit() throws WebMailException {
        XMLUserData ud; 
        AuthDisplayMngr adm; 

        ud=parent.getStorage().getUserData(selected_user, selected_domain, "");
        adm=parent.getStorage().getAuthenticator().getAuthDisplayMngr();

        adm.setPassChangeVars(ud, model);
        model.setStateVar("pass change tmpl", adm.getPassChangeTmpl());
    }
        
	
    public void setException(Exception ex) {
	model.setException(ex);
    }
	
    /**
     * Change the settings for a specific user.
     * This method will check for changes to a user's configuration and save the new user configuration.
     * Note that this should not be done when a user session is still active!
     * @param h Header parsed from AdministratorPlugin
     */
    public void changeUser(HTTPRequestHeader head) throws WebMailException {
	XMLUserData user=parent.getStorage().getUserData(selected_user,selected_domain,"",false);

	Enumeration contentkeys=head.getContentKeys();
	user.resetBoolVars();
	while(contentkeys.hasMoreElements()) {
	    String key=((String)contentkeys.nextElement()).toLowerCase();
	    if(key.startsWith("intvar")) {
		try {
		    long value=Long.parseLong(head.getContent(key));
		    user.setIntVar(key.substring(7),value);
		} catch(NumberFormatException ex) {
		    System.err.println("Warning: Remote provided illegal intvar in request header: \n("+key+","+head.getContent(key)+")");
		}
	    } else if(key.startsWith("boolvar")) {
		boolean value=head.getContent(key).toUpperCase().equals("ON");
		user.setBoolVar(key.substring(8),value);
	    }
	}

	user.setSignature(head.getContent("user signature"));
	user.setFullName(head.getContent("user full name"));
	user.setEmail(head.getContent("user email"));
	if(!head.getContent("user password").equals("")) {
	    net.wastl.webmail.server.Authenticator auth=parent.getStorage().getAuthenticator();
	    if(auth.canChangePassword()) {
            try {
		        auth.changePassword(user,head.getContent("user password"),head.getContent("user password"));
            }
            catch (InvalidPasswordException e) {
                /* XXX Not sure this is the right exception */
			    // Modified by exce, start
			    /**
                throw new InvalidDataException(parent.getStorage().getStringResource("EX NO CHANGE PASSWORD", Locale.getDefault()));
				**/
				throw new InvalidDataException(parent.getStorage().getStringResource("EX NO CHANGE PASSWORD", parent.getDefaultLocale()));
			    // Modified by exce, end
            }
	    } else {
		throw new InvalidDataException(parent.getStorage().getStringResource("EX NO CHANGE PASSWORD",Locale.getDefault()));
	    }
	}
	user.setPreferredLocale(head.getContent("user language"));

 	parent.getStorage().saveUserData(selected_user,selected_domain);

	selectUser(selected_user);
	selectDomain(selected_domain);

    }

    public void selectDomain(String domain) {
	model.setStateVar("selected domain",domain);

	selected_domain=domain;
	
	Enumeration enum=parent.getStorage().getUsers(domain);
	model.removeAllStateVars("user");
	while(enum.hasMoreElements()) {
	    model.addStateVar("user",(String)enum.nextElement());
	}
    }
	
	
    public void setEnv(String key, String value) {
	//env.put(key,value);
	model.setStateVar(key,value);
    }
	
    public void setEnv() {
	model.setStateVar("session id",session_code);
	model.setStateVar("base uri",parent.getBasePath());
	model.setStateVar("img base uri",parent.getBasePath());
 	model.setStateVar("uptime",parent.getUptime()/1000+"");
	model.update();

	// Here we must initialize which choices are available for ChoiceConfigParameters!
	XMLSystemData sysdata=parent.getStorage().getSystemData();	
	sysdata.initChoices();
	
	if(running_as_servlet) {
	    model.setStateVar("servlet status",parent.toString());
	} else {
	    model.setStateVar("http server status",((StatusServer)parent.getServer("HTTP")).getStatus());
	    model.setStateVar("ssl server status",((StatusServer)parent.getServer("SSL")).getStatus());
	}	    
	model.setStateVar("storage status",parent.getStorage().toString());

	/*
	  Generate a list of active sessions with some additional information
	  (idle time, session code, active mail connections, ...)
	*/
	XMLCommon.genericRemoveAll(model.getStateData(),"SESSION");
	Enumeration e=parent.getSessions();
	if(e != null && e.hasMoreElements()) {	  
	    while(e.hasMoreElements()) {
		String name=(String)e.nextElement();
		HTTPSession h=parent.getSession(name);
		if(h instanceof WebMailSession) {
		    WebMailSession w=(WebMailSession)h;		    

		    Element sess_elem=model.addStateElement("SESSION");
		    sess_elem.setAttribute("type","user");
		    
		    sess_elem.appendChild(model.createTextElement("SESS_USER",w.getUserName()));
		    sess_elem.appendChild(model.createTextElement("SESS_CODE",w.getSessionCode()));
		    sess_elem.appendChild(model.createTextElement("SESS_ADDRESS",w.getRemoteAddress().toString()));
		    sess_elem.appendChild(model.createStateVar("idle time",(System.currentTimeMillis()-w.getLastAccess())/1000+""));
		    					
		    Enumeration keys=w.getActiveConnections().keys();
		    while(keys.hasMoreElements()) {
			String next=(String)keys.nextElement();
			try {
			    sess_elem.appendChild(model.createTextElement("SESS_CONN",((Folder)w.getActiveConnections().get(next)).getURLName()+""));
			} catch(Exception ex) {
			    sess_elem.appendChild(model.createTextElement("SESS_CONN","Error while fetching connection "+next));
			}
		    }
		    /* If the remote is admin and we are not the remote! */
		    // && !h.getSessionCode().equals(session_code)
		} else if(h instanceof AdminSession) {
		    Element sess_elem=model.addStateElement("SESSION");
		    sess_elem.setAttribute("type","admin");

		    sess_elem.appendChild(model.createTextElement("SESS_USER","Administrator"));
		    sess_elem.appendChild(model.createTextElement("SESS_ADDRESS",h.getRemoteAddress().toString()));
		    sess_elem.appendChild(model.createTextElement("SESS_CODE",h.getSessionCode()));
		    sess_elem.appendChild(model.createStateVar("idle time",(System.currentTimeMillis()-h.getLastAccess())/1000+""));

		}
	    }
	}

	// Add all languages to the state
	model.removeAllStateVars("language");
	String lang=parent.getConfig("languages");
	StringTokenizer tok=new StringTokenizer(lang," ");
	while(tok.hasMoreTokens()) {
	    String t=tok.nextToken();
	    model.addStateVar("language",t);
	}

	model.removeAllStateVars("protocol");
	Provider[] stores=parent.getStoreProviders();
	for(int i=0; i<stores.length; i++) {
	    model.addStateVar("protocol",stores[i].getProtocol());
	}

    }
	
	
    public InetAddress getRemoteAddress() {
	return remote;
    }
	
	
    public long getTimeout() {
	return 600000;
    }
	
    public void timeoutOccured() {
    }
	
	
    public void saveData() {
    }

    public Document getModel() {
	return model.getRoot();
    }
} // AdminSession