1package eu.siacs.conversations.parser;
  2
  3import android.util.Log;
  4import android.util.Pair;
  5
  6import net.java.otr4j.session.Session;
  7import net.java.otr4j.session.SessionStatus;
  8
  9import java.net.URL;
 10import java.util.ArrayList;
 11import java.util.Set;
 12import java.util.UUID;
 13
 14import eu.siacs.conversations.Config;
 15import eu.siacs.conversations.crypto.axolotl.AxolotlService;
 16import eu.siacs.conversations.crypto.axolotl.XmppAxolotlMessage;
 17import eu.siacs.conversations.entities.Account;
 18import eu.siacs.conversations.entities.Bookmark;
 19import eu.siacs.conversations.entities.Contact;
 20import eu.siacs.conversations.entities.Conversation;
 21import eu.siacs.conversations.entities.Message;
 22import eu.siacs.conversations.entities.MucOptions;
 23import eu.siacs.conversations.http.HttpConnectionManager;
 24import eu.siacs.conversations.services.MessageArchiveService;
 25import eu.siacs.conversations.services.XmppConnectionService;
 26import eu.siacs.conversations.utils.CryptoHelper;
 27import eu.siacs.conversations.xml.Element;
 28import eu.siacs.conversations.xmpp.OnMessagePacketReceived;
 29import eu.siacs.conversations.xmpp.chatstate.ChatState;
 30import eu.siacs.conversations.xmpp.jid.Jid;
 31import eu.siacs.conversations.xmpp.pep.Avatar;
 32import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 33
 34public class MessageParser extends AbstractParser implements
 35		OnMessagePacketReceived {
 36	public MessageParser(XmppConnectionService service) {
 37		super(service);
 38	}
 39
 40	private boolean extractChatState(Conversation conversation, final MessagePacket packet) {
 41		ChatState state = ChatState.parse(packet);
 42		if (state != null && conversation != null) {
 43			final Account account = conversation.getAccount();
 44			Jid from = packet.getFrom();
 45			if (from.toBareJid().equals(account.getJid().toBareJid())) {
 46				conversation.setOutgoingChatState(state);
 47				if (state == ChatState.ACTIVE || state == ChatState.COMPOSING) {
 48					mXmppConnectionService.markRead(conversation);
 49					account.activateGracePeriod();
 50				}
 51				return false;
 52			} else {
 53				return conversation.setIncomingChatState(state);
 54			}
 55		}
 56		return false;
 57	}
 58
 59	private Message parseOtrChat(String body, Jid from, String id, Conversation conversation) {
 60		String presence;
 61		if (from.isBareJid()) {
 62			presence = "";
 63		} else {
 64			presence = from.getResourcepart();
 65		}
 66		if (body.matches("^\\?OTRv\\d{1,2}\\?.*")) {
 67			conversation.endOtrIfNeeded();
 68		}
 69		if (!conversation.hasValidOtrSession()) {
 70			conversation.startOtrSession(presence,false);
 71		} else {
 72			String foreignPresence = conversation.getOtrSession().getSessionID().getUserID();
 73			if (!foreignPresence.equals(presence)) {
 74				conversation.endOtrIfNeeded();
 75				conversation.startOtrSession(presence, false);
 76			}
 77		}
 78		try {
 79			conversation.setLastReceivedOtrMessageId(id);
 80			Session otrSession = conversation.getOtrSession();
 81			body = otrSession.transformReceiving(body);
 82			SessionStatus status = otrSession.getSessionStatus();
 83			if (body == null && status == SessionStatus.ENCRYPTED) {
 84				mXmppConnectionService.onOtrSessionEstablished(conversation);
 85				return null;
 86			} else if (body == null && status == SessionStatus.FINISHED) {
 87				conversation.resetOtrSession();
 88				mXmppConnectionService.updateConversationUi();
 89				return null;
 90			} else if (body == null || (body.isEmpty())) {
 91				return null;
 92			}
 93			if (body.startsWith(CryptoHelper.FILETRANSFER)) {
 94				String key = body.substring(CryptoHelper.FILETRANSFER.length());
 95				conversation.setSymmetricKey(CryptoHelper.hexToBytes(key));
 96				return null;
 97			}
 98			Message finishedMessage = new Message(conversation, body, Message.ENCRYPTION_OTR, Message.STATUS_RECEIVED);
 99			conversation.setLastReceivedOtrMessageId(null);
100			return finishedMessage;
101		} catch (Exception e) {
102			conversation.resetOtrSession();
103			return null;
104		}
105	}
106
107	private Message parseAxolotlChat(Element axolotlMessage, Jid from,  Conversation conversation, int status) {
108		Message finishedMessage = null;
109		AxolotlService service = conversation.getAccount().getAxolotlService();
110		XmppAxolotlMessage xmppAxolotlMessage = XmppAxolotlMessage.fromElement(axolotlMessage, from.toBareJid());
111		XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = service.processReceivingPayloadMessage(xmppAxolotlMessage);
112		if(plaintextMessage != null) {
113			finishedMessage = new Message(conversation, plaintextMessage.getPlaintext(), Message.ENCRYPTION_AXOLOTL, status);
114			finishedMessage.setAxolotlFingerprint(plaintextMessage.getFingerprint());
115			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(finishedMessage.getConversation().getAccount())+" Received Message with session fingerprint: "+plaintextMessage.getFingerprint());
116		}
117
118		return finishedMessage;
119	}
120
121	private class Invite {
122		Jid jid;
123		String password;
124		Invite(Jid jid, String password) {
125			this.jid = jid;
126			this.password = password;
127		}
128
129		public boolean execute(Account account) {
130			if (jid != null) {
131				Conversation conversation = mXmppConnectionService.findOrCreateConversation(account, jid, true);
132				if (!conversation.getMucOptions().online()) {
133					conversation.getMucOptions().setPassword(password);
134					mXmppConnectionService.databaseBackend.updateConversation(conversation);
135					mXmppConnectionService.joinMuc(conversation);
136					mXmppConnectionService.updateConversationUi();
137				}
138				return true;
139			}
140			return false;
141		}
142	}
143
144	private Invite extractInvite(Element message) {
145		Element x = message.findChild("x", "http://jabber.org/protocol/muc#user");
146		if (x != null) {
147			Element invite = x.findChild("invite");
148			if (invite != null) {
149				Element pw = x.findChild("password");
150				return new Invite(message.getAttributeAsJid("from"), pw != null ? pw.getContent(): null);
151			}
152		} else {
153			x = message.findChild("x","jabber:x:conference");
154			if (x != null) {
155				return new Invite(x.getAttributeAsJid("jid"),x.getAttribute("password"));
156			}
157		}
158		return null;
159	}
160
161	private static String extractStanzaId(Element packet, Jid by) {
162		for(Element child : packet.getChildren()) {
163			if (child.getName().equals("stanza-id")
164					&& "urn:xmpp:sid:0".equals(child.getNamespace())
165					&& by.equals(child.getAttributeAsJid("by"))) {
166				return child.getAttribute("id");
167			}
168		}
169		return null;
170	}
171
172	private void parseEvent(final Element event, final Jid from, final Account account) {
173		Element items = event.findChild("items");
174		String node = items == null ? null : items.getAttribute("node");
175		if ("urn:xmpp:avatar:metadata".equals(node)) {
176			Avatar avatar = Avatar.parseMetadata(items);
177			if (avatar != null) {
178				avatar.owner = from.toBareJid();
179				if (mXmppConnectionService.getFileBackend().isAvatarCached(avatar)) {
180					if (account.getJid().toBareJid().equals(from)) {
181						if (account.setAvatar(avatar.getFilename())) {
182							mXmppConnectionService.databaseBackend.updateAccount(account);
183						}
184						mXmppConnectionService.getAvatarService().clear(account);
185						mXmppConnectionService.updateConversationUi();
186						mXmppConnectionService.updateAccountUi();
187					} else {
188						Contact contact = account.getRoster().getContact(from);
189						contact.setAvatar(avatar);
190						mXmppConnectionService.getAvatarService().clear(contact);
191						mXmppConnectionService.updateConversationUi();
192						mXmppConnectionService.updateRosterUi();
193					}
194				} else {
195					mXmppConnectionService.fetchAvatar(account, avatar);
196				}
197			}
198		} else if ("http://jabber.org/protocol/nick".equals(node)) {
199			Element i = items.findChild("item");
200			Element nick = i == null ? null : i.findChild("nick", "http://jabber.org/protocol/nick");
201			if (nick != null && nick.getContent() != null) {
202				Contact contact = account.getRoster().getContact(from);
203				contact.setPresenceName(nick.getContent());
204				mXmppConnectionService.getAvatarService().clear(account);
205				mXmppConnectionService.updateConversationUi();
206				mXmppConnectionService.updateAccountUi();
207			}
208		} else if (AxolotlService.PEP_DEVICE_LIST.equals(node)) {
209			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account)+"Received PEP device list update from "+ from + ", processing...");
210			Element item = items.findChild("item");
211			Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
212			AxolotlService axolotlService = account.getAxolotlService();
213			axolotlService.registerDevices(from, deviceIds);
214			mXmppConnectionService.updateAccountUi();
215		}
216	}
217
218	private boolean handleErrorMessage(Account account, MessagePacket packet) {
219		if (packet.getType() == MessagePacket.TYPE_ERROR) {
220			Jid from = packet.getFrom();
221			if (from != null) {
222				Element error = packet.findChild("error");
223				String text = error == null ? null : error.findChildContent("text");
224				if (text != null) {
225					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": sending message to "+ from+ " failed - " + text);
226				} else if (error != null) {
227					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": sending message to "+ from+ " failed - " + error);
228				}
229				Message message = mXmppConnectionService.markMessage(account,
230						from.toBareJid(),
231						packet.getId(),
232						Message.STATUS_SEND_FAILED);
233				if (message != null && message.getEncryption() == Message.ENCRYPTION_OTR) {
234					message.getConversation().endOtrIfNeeded();
235				}
236			}
237			return true;
238		}
239		return false;
240	}
241
242	@Override
243	public void onMessagePacketReceived(Account account, MessagePacket original) {
244		if (handleErrorMessage(account, original)) {
245			return;
246		}
247		final MessagePacket packet;
248		Long timestamp = null;
249		final boolean isForwarded;
250		boolean isCarbon = false;
251		String serverMsgId = null;
252		final Element fin = original.findChild("fin", "urn:xmpp:mam:0");
253		if (fin != null) {
254			mXmppConnectionService.getMessageArchiveService().processFin(fin,original.getFrom());
255			return;
256		}
257		final Element result = original.findChild("result","urn:xmpp:mam:0");
258		final MessageArchiveService.Query query = result == null ? null : mXmppConnectionService.getMessageArchiveService().findQuery(result.getAttribute("queryid"));
259		if (query != null && query.validFrom(original.getFrom())) {
260			Pair<MessagePacket, Long> f = original.getForwardedMessagePacket("result", "urn:xmpp:mam:0");
261			if (f == null) {
262				return;
263			}
264			timestamp = f.second;
265			packet = f.first;
266			isForwarded = true;
267			serverMsgId = result.getAttribute("id");
268			query.incrementMessageCount();
269		} else if (query != null) {
270			Log.d(Config.LOGTAG,account.getJid().toBareJid()+": received mam result from invalid sender");
271			return;
272		} else if (original.fromServer(account)) {
273			Pair<MessagePacket, Long> f;
274			f = original.getForwardedMessagePacket("received", "urn:xmpp:carbons:2");
275			f = f == null ? original.getForwardedMessagePacket("sent", "urn:xmpp:carbons:2") : f;
276			packet = f != null ? f.first : original;
277			if (handleErrorMessage(account, packet)) {
278				return;
279			}
280			timestamp = f != null ? f.second : null;
281			isCarbon = f != null;
282			isForwarded = isCarbon;
283		} else {
284			packet = original;
285			isForwarded = false;
286		}
287
288		if (timestamp == null) {
289			timestamp = AbstractParser.getTimestamp(packet, System.currentTimeMillis());
290		}
291		final String body = packet.getBody();
292		final Element mucUserElement = packet.findChild("x", "http://jabber.org/protocol/muc#user");
293		final String pgpEncrypted = packet.findChildContent("x", "jabber:x:encrypted");
294		final Element replaceElement = packet.findChild("replace", "urn:xmpp:message-correct:0");
295		final Element oob = packet.findChild("x", "jabber:x:oob");
296		final boolean isOob = oob!= null && body != null && body.equals(oob.findChildContent("url"));
297		final String replacementId = replaceElement == null ? null : replaceElement.getAttribute("id");
298		final Element axolotlEncrypted = packet.findChild(XmppAxolotlMessage.CONTAINERTAG, AxolotlService.PEP_PREFIX);
299		int status;
300		final Jid counterpart;
301		final Jid to = packet.getTo();
302		final Jid from = packet.getFrom();
303		final String remoteMsgId = packet.getId();
304
305		if (from == null) {
306			Log.d(Config.LOGTAG,"no from in: "+packet.toString());
307			return;
308		}
309		
310		boolean isTypeGroupChat = packet.getType() == MessagePacket.TYPE_GROUPCHAT;
311		boolean isProperlyAddressed = (to != null ) && (!to.isBareJid() || account.countPresences() <= 1);
312		boolean isMucStatusMessage = from.isBareJid() && mucUserElement != null && mucUserElement.hasChild("status");
313		if (packet.fromAccount(account)) {
314			status = Message.STATUS_SEND;
315			counterpart = to != null ? to : account.getJid();
316		} else {
317			status = Message.STATUS_RECEIVED;
318			counterpart = from;
319		}
320
321		Invite invite = extractInvite(packet);
322		if (invite != null && invite.execute(account)) {
323			return;
324		}
325
326		if (extractChatState(mXmppConnectionService.find(account, counterpart.toBareJid()), packet)) {
327			mXmppConnectionService.updateConversationUi();
328		}
329
330		if ((body != null || pgpEncrypted != null || axolotlEncrypted != null) && !isMucStatusMessage) {
331			Conversation conversation = mXmppConnectionService.findOrCreateConversation(account, counterpart.toBareJid(), isTypeGroupChat, query);
332			if (isTypeGroupChat) {
333				if (counterpart.getResourcepart().equals(conversation.getMucOptions().getActualNick())) {
334					status = Message.STATUS_SEND_RECEIVED;
335					isCarbon = true; //not really carbon but received from another resource
336					if (mXmppConnectionService.markMessage(conversation, remoteMsgId, status)) {
337						return;
338					} else if (remoteMsgId == null || Config.IGNORE_ID_REWRITE_IN_MUC) {
339						Message message = conversation.findSentMessageWithBody(packet.getBody());
340						if (message != null) {
341							mXmppConnectionService.markMessage(message, status);
342							return;
343						}
344					}
345				} else {
346					status = Message.STATUS_RECEIVED;
347				}
348			}
349			Message message;
350			if (body != null && body.startsWith("?OTR") && Config.supportOtr()) {
351				if (!isForwarded && !isTypeGroupChat && isProperlyAddressed) {
352					message = parseOtrChat(body, from, remoteMsgId, conversation);
353					if (message == null) {
354						return;
355					}
356				} else {
357					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": ignoring OTR message from "+from+" isForwarded="+Boolean.toString(isForwarded)+", isProperlyAddressed="+Boolean.valueOf(isProperlyAddressed));
358					message = new Message(conversation, body, Message.ENCRYPTION_NONE, status);
359				}
360			} else if (pgpEncrypted != null && Config.supportOpenPgp()) {
361				message = new Message(conversation, pgpEncrypted, Message.ENCRYPTION_PGP, status);
362			} else if (axolotlEncrypted != null && Config.supportOmemo()) {
363				Jid origin;
364				if (conversation.getMode() == Conversation.MODE_MULTI) {
365					origin = conversation.getMucOptions().getTrueCounterpart(counterpart.getResourcepart());
366					if (origin == null) {
367						Log.d(Config.LOGTAG,"axolotl message in non anonymous conference received");
368						return;
369					}
370				} else {
371					origin = from;
372				}
373				message = parseAxolotlChat(axolotlEncrypted, origin, conversation, status);
374				if (message == null) {
375					return;
376				}
377			} else {
378				message = new Message(conversation, body, Message.ENCRYPTION_NONE, status);
379			}
380
381			if (serverMsgId == null) {
382				serverMsgId = extractStanzaId(packet, isTypeGroupChat ? conversation.getJid().toBareJid() : account.getServer());
383			}
384
385			message.setCounterpart(counterpart);
386			message.setRemoteMsgId(remoteMsgId);
387			message.setServerMsgId(serverMsgId);
388			message.setCarbon(isCarbon);
389			message.setTime(timestamp);
390			message.setOob(isOob);
391			message.markable = packet.hasChild("markable", "urn:xmpp:chat-markers:0");
392			if (conversation.getMode() == Conversation.MODE_MULTI) {
393				Jid trueCounterpart = conversation.getMucOptions().getTrueCounterpart(counterpart.getResourcepart());
394				message.setTrueCounterpart(trueCounterpart);
395				if (trueCounterpart != null) {
396					updateLastseen(timestamp, account, trueCounterpart, false);
397				}
398				if (!isTypeGroupChat) {
399					message.setType(Message.TYPE_PRIVATE);
400				}
401			} else {
402				updateLastseen(timestamp, account, packet.getFrom(), true);
403			}
404
405			if (replacementId != null && mXmppConnectionService.allowMessageCorrection()) {
406				Message replacedMessage = conversation.findMessageWithRemoteIdAndCounterpart(replacementId,
407						counterpart,
408						message.getStatus() == Message.STATUS_RECEIVED,
409						message.isCarbon());
410				if (replacedMessage != null) {
411					final boolean fingerprintsMatch = replacedMessage.getAxolotlFingerprint() == null
412							|| replacedMessage.getAxolotlFingerprint().equals(message.getAxolotlFingerprint());
413					final boolean trueCountersMatch = replacedMessage.getTrueCounterpart() != null
414							&& replacedMessage.getTrueCounterpart().equals(message.getTrueCounterpart());
415					if (fingerprintsMatch && (trueCountersMatch || conversation.getMode() == Conversation.MODE_SINGLE)) {
416						Log.d(Config.LOGTAG, "replaced message '" + replacedMessage.getBody() + "' with '" + message.getBody() + "'");
417						final String uuid = replacedMessage.getUuid();
418						replacedMessage.setUuid(UUID.randomUUID().toString());
419						replacedMessage.setBody(message.getBody());
420						replacedMessage.setEdited(replacedMessage.getRemoteMsgId());
421						replacedMessage.setRemoteMsgId(remoteMsgId);
422						replacedMessage.setEncryption(message.getEncryption());
423						if (replacedMessage.getStatus() == Message.STATUS_RECEIVED) {
424							replacedMessage.markUnread();
425						}
426						mXmppConnectionService.updateMessage(replacedMessage, uuid);
427						mXmppConnectionService.getNotificationService().updateNotification(false);
428						if (mXmppConnectionService.confirmMessages() && remoteMsgId != null && !isForwarded && !isTypeGroupChat) {
429							sendMessageReceipts(account, packet);
430						}
431						if (replacedMessage.getEncryption() == Message.ENCRYPTION_PGP) {
432							conversation.getAccount().getPgpDecryptionService().add(replacedMessage);
433						}
434						return;
435					} else {
436						Log.d(Config.LOGTAG,account.getJid().toBareJid()+": received message correction but verification didn't check out");
437					}
438				}
439			}
440
441			boolean checkForDuplicates = query != null
442					|| (isTypeGroupChat && packet.hasChild("delay","urn:xmpp:delay"))
443					|| message.getType() == Message.TYPE_PRIVATE;
444			if (checkForDuplicates && conversation.hasDuplicateMessage(message)) {
445				Log.d(Config.LOGTAG,"skipping duplicate message from "+message.getCounterpart().toString()+" "+message.getBody());
446				return;
447			}
448
449			if (query != null && query.getPagingOrder() == MessageArchiveService.PagingOrder.REVERSE) {
450				conversation.prepend(message);
451			} else {
452				conversation.add(message);
453			}
454
455			if (message.getEncryption() == Message.ENCRYPTION_PGP) {
456				conversation.getAccount().getPgpDecryptionService().add(message);
457			}
458
459			if (query == null || query.getWith() == null) { //either no mam or catchup
460				if (status == Message.STATUS_SEND || status == Message.STATUS_SEND_RECEIVED) {
461					mXmppConnectionService.markRead(conversation);
462					if (query == null) {
463						account.activateGracePeriod();
464					}
465				} else {
466					message.markUnread();
467				}
468			}
469
470			if (query == null) {
471				mXmppConnectionService.updateConversationUi();
472			}
473
474			if (mXmppConnectionService.confirmMessages() && remoteMsgId != null && !isForwarded && !isTypeGroupChat) {
475				sendMessageReceipts(account, packet);
476			}
477
478			if (message.getStatus() == Message.STATUS_RECEIVED
479					&& conversation.getOtrSession() != null
480					&& !conversation.getOtrSession().getSessionID().getUserID()
481					.equals(message.getCounterpart().getResourcepart())) {
482				conversation.endOtrIfNeeded();
483			}
484
485			if (message.getEncryption() == Message.ENCRYPTION_NONE || mXmppConnectionService.saveEncryptedMessages()) {
486				mXmppConnectionService.databaseBackend.createMessage(message);
487			}
488			final HttpConnectionManager manager = this.mXmppConnectionService.getHttpConnectionManager();
489			if (message.trusted() && message.treatAsDownloadable() != Message.Decision.NEVER && manager.getAutoAcceptFileSize() > 0) {
490				manager.createNewDownloadConnection(message);
491			} else if (!message.isRead()) {
492				if (query == null) {
493					mXmppConnectionService.getNotificationService().push(message);
494				} else if (query.getWith() == null) { // mam catchup
495					mXmppConnectionService.getNotificationService().pushFromBacklog(message);
496				}
497			}
498		} else if (!packet.hasChild("body")){ //no body
499			if (isTypeGroupChat) {
500				Conversation conversation = mXmppConnectionService.find(account, from.toBareJid());
501				if (packet.hasChild("subject")) {
502					if (conversation != null && conversation.getMode() == Conversation.MODE_MULTI) {
503						conversation.setHasMessagesLeftOnServer(conversation.countMessages() > 0);
504						String subject = packet.findChildContent("subject");
505						conversation.getMucOptions().setSubject(subject);
506						final Bookmark bookmark = conversation.getBookmark();
507						if (bookmark != null && bookmark.getBookmarkName() == null) {
508							if (bookmark.setBookmarkName(subject)) {
509								mXmppConnectionService.pushBookmarks(account);
510							}
511						}
512						mXmppConnectionService.updateConversationUi();
513						return;
514					}
515				}
516
517				if (conversation != null && isMucStatusMessage) {
518					for (Element child : mucUserElement.getChildren()) {
519						if (child.getName().equals("status")
520								&& MucOptions.STATUS_CODE_ROOM_CONFIG_CHANGED.equals(child.getAttribute("code"))) {
521							mXmppConnectionService.fetchConferenceConfiguration(conversation);
522						}
523					}
524				}
525			}
526		}
527
528		Element received = packet.findChild("received", "urn:xmpp:chat-markers:0");
529		if (received == null) {
530			received = packet.findChild("received", "urn:xmpp:receipts");
531		}
532		if (received != null && !packet.fromAccount(account)) {
533			mXmppConnectionService.markMessage(account, from.toBareJid(), received.getAttribute("id"), Message.STATUS_SEND_RECEIVED);
534		}
535		Element displayed = packet.findChild("displayed", "urn:xmpp:chat-markers:0");
536		if (displayed != null) {
537			if (packet.fromAccount(account)) {
538				Conversation conversation = mXmppConnectionService.find(account,counterpart.toBareJid());
539				if (conversation != null) {
540					mXmppConnectionService.markRead(conversation);
541				}
542			} else {
543				updateLastseen(timestamp, account, packet.getFrom(), true);
544				final Message displayedMessage = mXmppConnectionService.markMessage(account, from.toBareJid(), displayed.getAttribute("id"), Message.STATUS_SEND_DISPLAYED);
545				Message message = displayedMessage == null ? null : displayedMessage.prev();
546				while (message != null
547						&& message.getStatus() == Message.STATUS_SEND_RECEIVED
548						&& message.getTimeSent() < displayedMessage.getTimeSent()) {
549					mXmppConnectionService.markMessage(message, Message.STATUS_SEND_DISPLAYED);
550					message = message.prev();
551				}
552			}
553		}
554
555		Element event = packet.findChild("event", "http://jabber.org/protocol/pubsub#event");
556		if (event != null) {
557			parseEvent(event, from, account);
558		}
559
560		String nick = packet.findChildContent("nick", "http://jabber.org/protocol/nick");
561		if (nick != null) {
562			Contact contact = account.getRoster().getContact(from);
563			contact.setPresenceName(nick);
564		}
565	}
566
567	private void sendMessageReceipts(Account account, MessagePacket packet) {
568		ArrayList<String> receiptsNamespaces = new ArrayList<>();
569		if (packet.hasChild("markable", "urn:xmpp:chat-markers:0")) {
570			receiptsNamespaces.add("urn:xmpp:chat-markers:0");
571		}
572		if (packet.hasChild("request", "urn:xmpp:receipts")) {
573			receiptsNamespaces.add("urn:xmpp:receipts");
574		}
575		if (receiptsNamespaces.size() > 0) {
576			MessagePacket receipt = mXmppConnectionService.getMessageGenerator().received(account,
577					packet,
578					receiptsNamespaces,
579					packet.getType());
580			mXmppConnectionService.sendMessagePacket(account, receipt);
581		}
582	}
583}