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Smack/apps/webchat/source/java/org/jivesoftware/webchat/JiveChatServlet.java

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/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright (C) 2003 Jive Software. All rights reserved.
*
* This software is the proprietary information of Jive Software. Use is subject to license terms.
*/
package org.jivesoftware.webchat;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.jivesoftware.smack.*;
import org.jivesoftware.smack.filter.*;
import org.jivesoftware.smack.packet.*;
import org.jivesoftware.smack.util.StringUtils;
/**
* An extension of HttpServlet customized to handle transactions between N webclients
* and M chats located on a given XMPP server. While N >= M in the case of group chats,
* the code will currently, never the less, hold onto N connections to the XMPP server.<br>
*
* It is assumed that all JSP pages are in the context root. The init params should be:
* <ul>
* <li> host</li>
* <li> port (optional)</li>
* <li> SSLEnabled (optional)</li>
* </ul>
*
* @author Bill Lynch
* @author loki der quaeler
*/
public class JiveChatServlet
extends HttpServlet
implements HttpSessionListener, PacketListener {
static public final String JIVE_WEB_CHAT_RESOURCE_NAME = "WebChat";
static protected long PACKET_RESPONSE_TIMEOUT_MS = 5000;
static protected String CHAT_LAUNCHER_URI_SUFFIX = "/chat-launcher.jsp";
static protected String CREATE_ACCOUNT_URI = "/account_creation.jsp";
static protected String LOGIN_URI = "/index.jsp";
static protected String ERRORS_ATTRIBUTE_STRING = "messenger.servlet.errors";
static protected String NICKNAME_ATTRIBUTE_STRING = "messenger.servlet.nickname";
static protected String ROOM_ATTRIBUTE_STRING = "messenger.servlet.room";
static protected String HOST_PARAM_STRING = "host";
static protected String PORT_PARAM_STRING = "port";
static protected String SSL_PARAM_STRING = "SSLEnabled";
static protected String COMMAND_PARAM_STRING = "command";
static protected String NICKNAME_PARAM_STRING = "nickname";
static protected String PASSWORD_PARAM_STRING = "password";
static protected String RETYPED_PASSWORD_PARAM_STRING = "password_zwei";
static protected String ROOM_PARAM_STRING = "room";
static protected String USERNAME_PARAM_STRING = "username";
static protected String ANON_LOGIN_COMMAND_STRING = "anon_login";
static protected String CREATE_ACCOUNT_COMMAND_STRING = "create_account";
static protected String LOGIN_COMMAND_STRING = "login";
static protected String LOGOUT_COMMAND_STRING = "logout";
static protected String READ_COMMAND_STRING = "read";
static protected String SILENCE_COMMAND_STRING = "silence";
static protected String WRITE_COMMAND_STRING = "write";
static protected String MESSAGE_REQUEST_STRING = "message";
// is this value used elsewhere? (if not, why a string?) PENDING
static protected String ERROR_RETURN_CODE_STRING = "error";
static protected String SUCCESS_RETURN_CODE_STRING = "success";
// k/v :: S(session id) / ChatData
static protected Map SESSION_CHATDATA_MAP = new HashMap();
// k/v :: S(unique root of packet ids) / ChatData
static protected Map PACKET_ROOT_CHATDATA_MAP = new HashMap();
static protected EmoticonFilter EMOTICONFILTER = new EmoticonFilter();
static protected URLTranscoder URLTRANSCODER = new URLTranscoder();
protected String host;
protected int port;
protected boolean sslEnabled;
public void init (ServletConfig config)
throws ServletException {
ServletContext context = null;
String portParameter = null;
super.init(config);
// XMPPConnection.DEBUG_ENABLED = true;
context = config.getServletContext();
this.host = context.getInitParameter(HOST_PARAM_STRING);
if (this.host == null) {
throw new ServletException("Init parameter \"" + HOST_PARAM_STRING + "\" must be set.");
}
this.port = -1;
portParameter = context.getInitParameter(PORT_PARAM_STRING);
if (portParameter != null) {
try {
this.port = Integer.parseInt(portParameter);
} catch (NumberFormatException nfe) {
throw new ServletException("Init parameter \"" + PORT_PARAM_STRING
+ "\" must be a valid number.", nfe);
}
}
this.sslEnabled
= Boolean.valueOf(context.getInitParameter(SSL_PARAM_STRING)).booleanValue();
}
/**
* Take care of closing down everything we're holding on to, then bubble up the destroy
* to our superclass.
*/
public void destroy () {
synchronized (SESSION_CHATDATA_MAP) {
for (Iterator i = SESSION_CHATDATA_MAP.values().iterator(); i.hasNext(); ) {
ChatData chatData = (ChatData)i.next();
if (chatData.groupChat != null) {
chatData.groupChat.leave();
}
chatData.connection.close();
}
}
super.destroy();
}
protected void service (HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
String sessionID = session.getId();
String path = request.getContextPath();
String command = request.getParameter(COMMAND_PARAM_STRING);
if (READ_COMMAND_STRING.equals(command)) {
ChatData chatData = (ChatData)SESSION_CHATDATA_MAP.get(sessionID);
StringBuffer reply = null;
boolean foundData = false;
Message message = null;
int i = 0;
if (chatData == null) {
this.writeData("Must login first.", response);
return;
}
reply = new StringBuffer();
reply.append("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">\n");
reply.append("<html><head><title>Chat Read Page</title>\n");
reply.append("<meta http-equiv=\"refresh\" content=\"2\">\n");
reply.append("<script language=\"Javascript\" src=\"common.js\"></script>");
reply.append("<script language=\"JavaScript\" type=\"text/javascript\">\n");
reply.append(" var nickname = \"");
reply.append(request.getSession().getAttribute(NICKNAME_ATTRIBUTE_STRING));
reply.append("\";\n");
message = chatData.groupChat.pollMessage();
while (message != null) {
String from = message.getFrom();
String body = message.getBody();
// Get the the user's nickname
from = StringUtils.parseResource(from);
// PENDING - stop using the replace method
// encode the HTML special characters
body = this.replace(body, "&", "&amp;");
body = this.replace(body, "<", "&lt;");
body = this.replace(body, ">", "&gt;");
// replace newlines in the body:
body = this.replace(body, "\r", "");
body = this.replace(body, "\n", "<br>");
// encode the quotes
body = this.replace(body, "\"", "&quot;");
// encode the embedded urls
body = URLTRANSCODER.encodeURLsInText(body);
// Apply emoticons
body = EMOTICONFILTER.applyFilter(body);
if (from.length() == 0) {
reply.append(" var body").append(i).append(" = \"").append(body);
reply.append("\";\n addChatText(body").append(i).append(", true);\n");
} else {
reply.append(" var from").append(i).append(" = \"").append(from);
reply.append("\";\n var body").append(i).append(" = \"").append(body);
reply.append("\";\n addUserName(from").append(i);
reply.append(");\n addChatText(body").append(i).append(", false);\n");
}
message = chatData.groupChat.pollMessage();
foundData = true;
i++;
}
synchronized (chatData.newJoins) {
synchronized (chatData.newDepartures) {
Iterator it = chatData.newJoins.iterator();
i = 0;
while (it.hasNext()) {
reply.append(" var joined").append(i).append(" = \"").append(it.next());
reply.append("\";\n userJoined(joined").append(i).append(");\n");
i++;
}
i = 0;
it = chatData.newDepartures.iterator();
while (it.hasNext()) {
reply.append(" var departed").append(i).append(" = \"").append(it.next());
reply.append("\";\n userDeparted(departed").append(i).append(");\n");
i++;
}
chatData.newJoins.clear();
chatData.newDepartures.clear();
}
}
reply.append("</script>\n</head><body></body></html>");
this.writeData(reply.toString(), response);
} else if (WRITE_COMMAND_STRING.equals(command)) {
String message = request.getParameter(MESSAGE_REQUEST_STRING);
ChatData chatData = (ChatData)SESSION_CHATDATA_MAP.get(sessionID);
if (message == null) {
this.writeData("Parameter \"" + MESSAGE_REQUEST_STRING + "\" is required.",
response);
return;
} else if (chatData == null) {
this.writeData("Must login first.", response);
return;
}
try {
StringBuffer reply = new StringBuffer();
chatData.groupChat.sendMessage(message.trim());
reply.append("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">\n");
reply.append("<html><head>\n");
reply.append(
"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">\n");
reply.append("<title>Chat Form</title>");
reply.append("</head><body>\n");
reply.append("<form name=\"chatform\" action=\"").append(path);
reply.append("/ChatServlet\" method=\"post\">\n");
reply.append("<input type=\"hidden\" name=\"command\" value=\"write\">\n");
reply.append("<input type=\"hidden\" name=\"message\" value=\"\">\n");
reply.append("</form></body></html>");
this.writeData(reply.toString(), response);
} catch (XMPPException e) {
// PENDING - better handling
e.printStackTrace();
}
} else if (LOGOUT_COMMAND_STRING.equals(command)) {
ChatData chatData = null;
synchronized (SESSION_CHATDATA_MAP) {
chatData = (ChatData)SESSION_CHATDATA_MAP.remove(sessionID);
}
if (chatData != null) {
if (chatData.groupChat != null) {
chatData.groupChat.leave();
}
synchronized (PACKET_ROOT_CHATDATA_MAP) {
Packet p = new IQ();
String root = this.getPacketIDRoot(p);
PACKET_ROOT_CHATDATA_MAP.remove(root);
}
chatData.connection.close();
}
} else if (ANON_LOGIN_COMMAND_STRING.equals(command)) {
String returnCode = this.handleLogin(request, true);
if (SUCCESS_RETURN_CODE_STRING.equals(returnCode)) {
response.sendRedirect(path + CHAT_LAUNCHER_URI_SUFFIX);
} else {
// error, return to the original page to display errors and allow re-attempts
RequestDispatcher rd = request.getRequestDispatcher(LOGIN_URI);
rd.forward(request, response);
}
} else if (LOGIN_COMMAND_STRING.equals(command)) {
String returnCode = this.handleLogin(request, false);
if (SUCCESS_RETURN_CODE_STRING.equals(returnCode)) {
response.sendRedirect(path + CHAT_LAUNCHER_URI_SUFFIX);
} else {
// error, return to the original page to display errors and allow re-attempts
RequestDispatcher rd = request.getRequestDispatcher(LOGIN_URI);
rd.forward(request, response);
}
} else if (CREATE_ACCOUNT_COMMAND_STRING.equals(command)) {
String returnCode = this.createAccount(request);
if (SUCCESS_RETURN_CODE_STRING.equals(returnCode)) {
response.sendRedirect(path + LOGIN_URI);
} else {
// error, return to the original page to display errors and allow re-attempts
RequestDispatcher rd = request.getRequestDispatcher(CREATE_ACCOUNT_URI);
rd.forward(request, response);
}
} else if (SILENCE_COMMAND_STRING.equals(command)) {
// do nothing
} else if (command != null) {
this.writeData(("Invalid command: " + command), response);
} else {
this.writeData("Jive Messenger Chat Servlet", response);
}
}
protected String getPacketIDRoot (Packet p) {
if (p == null) {
return null;
}
return p.getPacketID().substring(0, 5);
}
/**
* Creates an account for the user data specified.
*/
private String createAccount (HttpServletRequest request) {
String sessionID = request.getSession().getId();
String username = request.getParameter(USERNAME_PARAM_STRING);
String password = request.getParameter(PASSWORD_PARAM_STRING);
String retypedPassword = request.getParameter(RETYPED_PASSWORD_PARAM_STRING);
Map errors = new HashMap();
// PENDING: validate already taken username
if ((username == null) || (username.trim().length() == 0)) {
errors.put("empty_username", "");
}
if ((password == null) || (password.trim().length() == 0)) {
errors.put("empty_password", "");
}
if ((retypedPassword == null) || (retypedPassword.trim().length() == 0)) {
errors.put("empty_password_two", "");
}
if ((retypedPassword != null) && (password != null)
&& (! retypedPassword.equals(password))) {
errors.put("mismatch_password", "");
}
// If there were no errors, continue
if (errors.size() == 0) {
ChatData chatData = (ChatData)SESSION_CHATDATA_MAP.get(sessionID);
// If a connection already exists for this session, close it before creating
// another.
if (chatData != null) {
if (chatData.groupChat != null) {
chatData.groupChat.leave();
}
chatData.connection.close();
}
chatData = new ChatData();
try {
AccountManager am = null;
// Create connection.
if (! this.sslEnabled) {
if (port != -1) {
chatData.connection = new XMPPConnection(this.host, this.port);
} else {
chatData.connection = new XMPPConnection(this.host);
}
} else {
if (port != -1) {
chatData.connection = new SSLXMPPConnection(this.host, this.port);
}
else {
chatData.connection = new SSLXMPPConnection(this.host);
}
}
am = chatData.connection.getAccountManager();
// PENDING check whether the server even supports account creation
am.createAccount(username, password);
} catch (XMPPException e) {
errors.put("general", "The server reported an error in account creation: "
+ e.getXMPPError().getMessage());
}
}
if (errors.size() > 0) {
request.setAttribute(ERRORS_ATTRIBUTE_STRING, errors);
return ERROR_RETURN_CODE_STRING;
}
return SUCCESS_RETURN_CODE_STRING;
}
/**
* Handles login logic.
*/
private String handleLogin (HttpServletRequest request, boolean anonymous) {
String sessionID = request.getSession().getId();
String username = request.getParameter(USERNAME_PARAM_STRING);
String password = request.getParameter(PASSWORD_PARAM_STRING);
String room = request.getParameter(ROOM_PARAM_STRING);
String nickname = request.getParameter(NICKNAME_PARAM_STRING);
Map errors = new HashMap();
// Validate parameters
if ((! anonymous) && ((username == null) || (username.trim().length() == 0))) {
errors.put(USERNAME_PARAM_STRING, "");
}
if ((! anonymous) && ((password == null) || (password.trim().length() == 0))) {
errors.put(PASSWORD_PARAM_STRING, "");
}
if ((room == null) || (room.trim().length() == 0)) {
errors.put(ROOM_PARAM_STRING, "");
}
if ((nickname == null) || (nickname.trim().length() == 0)) {
errors.put(NICKNAME_PARAM_STRING, "");
}
// If there were no errors, continue
if (errors.size() == 0) {
ChatData chatData = (ChatData)SESSION_CHATDATA_MAP.get(sessionID);
// If a connection already exists for this session, close it before creating
// another.
if (chatData != null) {
if (chatData.groupChat != null) {
chatData.groupChat.leave();
}
chatData.connection.close();
}
chatData = new ChatData();
try {
// Create connection.
if (! this.sslEnabled) {
if (port != -1) {
chatData.connection = new XMPPConnection(this.host, this.port);
} else {
chatData.connection = new XMPPConnection(this.host);
}
} else {
if (port != -1) {
chatData.connection = new SSLXMPPConnection(this.host, this.port);
}
else {
chatData.connection = new SSLXMPPConnection(this.host);
}
}
if (anonymous) {
Authentication a = new Authentication();
PacketCollector pc = chatData.connection.createPacketCollector(
new PacketIDFilter(a.getPacketID()));
Authentication responsePacket = null;
a.setType(IQ.Type.SET);
chatData.connection.sendPacket(a);
responsePacket = (Authentication)pc.nextResult(PACKET_RESPONSE_TIMEOUT_MS);
if (responsePacket == null) {
// throw new XMPPException("No response from the server.");
}
// check for error response
pc.cancel();
// since GroupChat isn't setting the 'from' in it's message sends,
// i can't see a problem in not doing anything with the unique resource
// we've just been given by the server. if GroupChat starts setting the
// from, it would probably grab the information from the XMPPConnection
// instance it holds, and as such we would then need to introduce the
// concept of anonymous logins to XMPPConnection, or tell GroupChat what
// to do what username is null or blank but a resource exists... PENDING
} else {
chatData.connection.login(username, password, JIVE_WEB_CHAT_RESOURCE_NAME);
}
chatData.connection.addPacketListener(this,
new PacketTypeFilter(Presence.class));
synchronized (SESSION_CHATDATA_MAP) {
SESSION_CHATDATA_MAP.put(sessionID, chatData);
}
synchronized (PACKET_ROOT_CHATDATA_MAP) {
Packet p = new IQ();
String root = this.getPacketIDRoot(p);
// PENDING -- we won't do anything with this packet, so it will ultimately look
// to the server as though a packet has disappeared -- is this ok with the
// server?
PACKET_ROOT_CHATDATA_MAP.put(root, chatData);
}
// Join groupChat room.
chatData.groupChat = chatData.connection.createGroupChat(room);
chatData.groupChat.join(nickname);
// Put the user's nickname in the session - this is used by the view to correctly
// display the user's messages in a different color:
request.getSession().setAttribute(NICKNAME_ATTRIBUTE_STRING, nickname);
request.getSession().setAttribute(ROOM_ATTRIBUTE_STRING, room);
} catch (XMPPException e) {
XMPPError err = e.getXMPPError();
errors.put("general", ((err != null) ? err.getMessage() : e.getMessage()));
if (chatData.groupChat != null) {
chatData.groupChat.leave();
}
}
}
if (errors.size() > 0) {
request.setAttribute(ERRORS_ATTRIBUTE_STRING, errors);
return ERROR_RETURN_CODE_STRING;
}
return SUCCESS_RETURN_CODE_STRING;
}
private void writeData (String data, HttpServletResponse response) {
try {
PrintWriter responseWriter = response.getWriter();
response.setContentType("text/html");
responseWriter.println(data);
responseWriter.close();
} catch (IOException ioe) {
// PENDING
}
}
// a hack class to hold a data glom (really hacky)
private class ChatData {
private XMPPConnection connection;
private GroupChat groupChat;
private Set newJoins = new HashSet();
private Set newDepartures = new HashSet();
}
/**
* Replaces all instances of oldString with newString in string.
*
* PENDING - why is this final?
* PENDING - take this out -- it fails under some cases...
*
* @param string the String to search to perform replacements on
* @param oldString the String that should be replaced by newString
* @param newString the String that will replace all instances of oldString
*
* @return a String will all instances of oldString replaced by newString
*/
static public final String replace (String string, String oldString, String newString) {
int i = 0;
// MAY RETURN THIS BLOCK
if (string == null) {
return null;
}
if (newString == null) {
return string;
}
// Make sure that oldString appears at least once before doing any processing.
if (( i=string.indexOf(oldString, i)) >= 0) {
// Use char []'s, as they are more efficient to deal with.
char[] string2 = string.toCharArray();
char[] newString2 = newString.toCharArray();
int oLength = oldString.length();
StringBuffer buf = new StringBuffer(string2.length);
int j = 1;
buf.append(string2, 0, i).append(newString2);
i += oLength;
// Replace all remaining instances of oldString with newString.
while ((i=string.indexOf(oldString, i)) > 0) {
buf.append(string2, j, (i - j)).append(newString2);
i += oLength;
j = i;
}
buf.append(string2, j, (string2.length - j));
return buf.toString();
}
return string;
}
/**
*
* HttpSessionListener implementation
*
*/
public void sessionCreated (HttpSessionEvent event) { }
public void sessionDestroyed (HttpSessionEvent event) {
String sessionID = event.getSession().getId();
ChatData chatData = null;
synchronized (SESSION_CHATDATA_MAP) {
chatData = (ChatData)SESSION_CHATDATA_MAP.remove(sessionID);
}
if (chatData != null) {
if (chatData.groupChat != null) {
chatData.groupChat.leave();
}
synchronized (PACKET_ROOT_CHATDATA_MAP) {
Packet p = new IQ();
String root = this.getPacketIDRoot(p);
PACKET_ROOT_CHATDATA_MAP.remove(root);
}
chatData.connection.close();
}
}
/**
*
* PacketListener implementation
*
*/
public void processPacket (Packet packet) {
Presence presence = (Presence)packet;
String root = null;
ChatData chatData = null;
String userName = null;
// MAY RETURN THIS BLOCK
if (presence.getMode() == Presence.Mode.INVISIBLE) {
return;
}
root = this.getPacketIDRoot(presence);
chatData = (ChatData)PACKET_ROOT_CHATDATA_MAP.get(root);
// MAY RETURN THIS BLOCK
if (chatData == null) {
return;
}
userName = StringUtils.parseResource(packet.getFrom());
if (presence.getType() == Presence.Type.UNAVAILABLE) {
synchronized (chatData.newDepartures) {
synchronized (chatData.newJoins) {
chatData.newJoins.remove(userName);
chatData.newDepartures.add(userName);
}
}
} else if (presence.getType() == Presence.Type.AVAILABLE) {
synchronized (chatData.newJoins) {
synchronized (chatData.newDepartures) {
chatData.newDepartures.remove(userName);
chatData.newJoins.add(userName);
}
}
}
}
}
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