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