1package eu.siacs.conversations.parser;
  2
  3import android.os.Build;
  4import android.text.Html;
  5import android.util.Log;
  6import android.util.Pair;
  7
  8import net.java.otr4j.session.Session;
  9import net.java.otr4j.session.SessionStatus;
 10
 11import java.text.SimpleDateFormat;
 12import java.util.ArrayList;
 13import java.util.Arrays;
 14import java.util.Date;
 15import java.util.List;
 16import java.util.Locale;
 17import java.util.Set;
 18import java.util.UUID;
 19
 20import eu.siacs.conversations.Config;
 21import eu.siacs.conversations.R;
 22import eu.siacs.conversations.crypto.OtrService;
 23import eu.siacs.conversations.crypto.axolotl.AxolotlService;
 24import eu.siacs.conversations.crypto.axolotl.XmppAxolotlMessage;
 25import eu.siacs.conversations.entities.Account;
 26import eu.siacs.conversations.entities.Bookmark;
 27import eu.siacs.conversations.entities.Contact;
 28import eu.siacs.conversations.entities.Conversation;
 29import eu.siacs.conversations.entities.Message;
 30import eu.siacs.conversations.entities.MucOptions;
 31import eu.siacs.conversations.entities.Presence;
 32import eu.siacs.conversations.entities.ReadByMarker;
 33import eu.siacs.conversations.entities.ReceiptRequest;
 34import eu.siacs.conversations.entities.ServiceDiscoveryResult;
 35import eu.siacs.conversations.http.HttpConnectionManager;
 36import eu.siacs.conversations.services.MessageArchiveService;
 37import eu.siacs.conversations.services.XmppConnectionService;
 38import eu.siacs.conversations.utils.CryptoHelper;
 39import eu.siacs.conversations.xml.Namespace;
 40import eu.siacs.conversations.xml.Element;
 41import eu.siacs.conversations.xmpp.OnMessagePacketReceived;
 42import eu.siacs.conversations.xmpp.chatstate.ChatState;
 43import eu.siacs.conversations.xmpp.jid.Jid;
 44import eu.siacs.conversations.xmpp.pep.Avatar;
 45import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 46
 47public class MessageParser extends AbstractParser implements OnMessagePacketReceived {
 48
 49	private static final List<String> CLIENTS_SENDING_HTML_IN_OTR = Arrays.asList("Pidgin", "Adium", "Trillian");
 50
 51	public MessageParser(XmppConnectionService service) {
 52		super(service);
 53	}
 54
 55	private boolean extractChatState(Conversation c, final boolean isTypeGroupChat, final MessagePacket packet) {
 56		ChatState state = ChatState.parse(packet);
 57		if (state != null && c != null) {
 58			final Account account = c.getAccount();
 59			Jid from = packet.getFrom();
 60			if (from.toBareJid().equals(account.getJid().toBareJid())) {
 61				c.setOutgoingChatState(state);
 62				if (state == ChatState.ACTIVE || state == ChatState.COMPOSING) {
 63					mXmppConnectionService.markRead(c);
 64					activateGracePeriod(account);
 65				}
 66				return false;
 67			} else {
 68				if (isTypeGroupChat) {
 69					MucOptions.User user = c.getMucOptions().findUserByFullJid(from);
 70					if (user != null) {
 71						return user.setChatState(state);
 72					} else {
 73						return false;
 74					}
 75				} else {
 76					return c.setIncomingChatState(state);
 77				}
 78			}
 79		}
 80		return false;
 81	}
 82
 83	private Message parseOtrChat(String body, Jid from, String id, Conversation conversation) {
 84		String presence;
 85		if (from.isBareJid()) {
 86			presence = "";
 87		} else {
 88			presence = from.getResourcepart();
 89		}
 90		if (body.matches("^\\?OTRv\\d{1,2}\\?.*")) {
 91			conversation.endOtrIfNeeded();
 92		}
 93		if (!conversation.hasValidOtrSession()) {
 94			conversation.startOtrSession(presence, false);
 95		} else {
 96			String foreignPresence = conversation.getOtrSession().getSessionID().getUserID();
 97			if (!foreignPresence.equals(presence)) {
 98				conversation.endOtrIfNeeded();
 99				conversation.startOtrSession(presence, false);
100			}
101		}
102		try {
103			conversation.setLastReceivedOtrMessageId(id);
104			Session otrSession = conversation.getOtrSession();
105			body = otrSession.transformReceiving(body);
106			SessionStatus status = otrSession.getSessionStatus();
107			if (body == null && status == SessionStatus.ENCRYPTED) {
108				mXmppConnectionService.onOtrSessionEstablished(conversation);
109				return null;
110			} else if (body == null && status == SessionStatus.FINISHED) {
111				conversation.resetOtrSession();
112				mXmppConnectionService.updateConversationUi();
113				return null;
114			} else if (body == null || (body.isEmpty())) {
115				return null;
116			}
117			if (body.startsWith(CryptoHelper.FILETRANSFER)) {
118				String key = body.substring(CryptoHelper.FILETRANSFER.length());
119				conversation.setSymmetricKey(CryptoHelper.hexToBytes(key));
120				return null;
121			}
122			if (clientMightSendHtml(conversation.getAccount(), from)) {
123				Log.d(Config.LOGTAG, conversation.getAccount().getJid().toBareJid() + ": received OTR message from bad behaving client. escaping HTML…");
124				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
125					body = Html.fromHtml(body, Html.FROM_HTML_MODE_LEGACY).toString();
126				} else {
127					body = Html.fromHtml(body).toString();
128				}
129			}
130
131			final OtrService otrService = conversation.getAccount().getOtrService();
132			Message finishedMessage = new Message(conversation, body, Message.ENCRYPTION_OTR, Message.STATUS_RECEIVED);
133			finishedMessage.setFingerprint(otrService.getFingerprint(otrSession.getRemotePublicKey()));
134			conversation.setLastReceivedOtrMessageId(null);
135
136			return finishedMessage;
137		} catch (Exception e) {
138			conversation.resetOtrSession();
139			return null;
140		}
141	}
142
143	private static boolean clientMightSendHtml(Account account, Jid from) {
144		String resource = from.getResourcepart();
145		if (resource == null) {
146			return false;
147		}
148		Presence presence = account.getRoster().getContact(from).getPresences().getPresences().get(resource);
149		ServiceDiscoveryResult disco = presence == null ? null : presence.getServiceDiscoveryResult();
150		if (disco == null) {
151			return false;
152		}
153		return hasIdentityKnowForSendingHtml(disco.getIdentities());
154	}
155
156	private static boolean hasIdentityKnowForSendingHtml(List<ServiceDiscoveryResult.Identity> identities) {
157		for (ServiceDiscoveryResult.Identity identity : identities) {
158			if (identity.getName() != null) {
159				if (CLIENTS_SENDING_HTML_IN_OTR.contains(identity.getName())) {
160					return true;
161				}
162			}
163		}
164		return false;
165	}
166
167	private Message parseAxolotlChat(Element axolotlMessage, Jid from, Conversation conversation, int status, boolean postpone) {
168		final AxolotlService service = conversation.getAccount().getAxolotlService();
169		final XmppAxolotlMessage xmppAxolotlMessage;
170		try {
171			xmppAxolotlMessage = XmppAxolotlMessage.fromElement(axolotlMessage, from.toBareJid());
172		} catch (Exception e) {
173			Log.d(Config.LOGTAG, conversation.getAccount().getJid().toBareJid() + ": invalid omemo message received " + e.getMessage());
174			return null;
175		}
176		if (xmppAxolotlMessage.hasPayload()) {
177			final XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = service.processReceivingPayloadMessage(xmppAxolotlMessage, postpone);
178			if (plaintextMessage != null) {
179				Message finishedMessage = new Message(conversation, plaintextMessage.getPlaintext(), Message.ENCRYPTION_AXOLOTL, status);
180				finishedMessage.setFingerprint(plaintextMessage.getFingerprint());
181				Log.d(Config.LOGTAG, AxolotlService.getLogprefix(finishedMessage.getConversation().getAccount()) + " Received Message with session fingerprint: " + plaintextMessage.getFingerprint());
182				return finishedMessage;
183			}
184		} else {
185			Log.d(Config.LOGTAG,conversation.getAccount().getJid().toBareJid()+": received OMEMO key transport message");
186			service.processReceivingKeyTransportMessage(xmppAxolotlMessage, postpone);
187		}
188		return null;
189	}
190
191	private class Invite {
192		final Jid jid;
193		final String password;
194		final Contact inviter;
195
196		Invite(Jid jid, String password, Contact inviter) {
197			this.jid = jid;
198			this.password = password;
199			this.inviter = inviter;
200		}
201
202		public boolean execute(Account account) {
203			if (jid != null) {
204				Conversation conversation = mXmppConnectionService.findOrCreateConversation(account, jid, true, false);
205				if (!conversation.getMucOptions().online()) {
206					conversation.getMucOptions().setPassword(password);
207					mXmppConnectionService.databaseBackend.updateConversation(conversation);
208					mXmppConnectionService.joinMuc(conversation, inviter != null && inviter.mutualPresenceSubscription());
209					mXmppConnectionService.updateConversationUi();
210				}
211				return true;
212			}
213			return false;
214		}
215	}
216
217	private Invite extractInvite(Account account, Element message) {
218		Element x = message.findChild("x", "http://jabber.org/protocol/muc#user");
219		if (x != null) {
220			Element invite = x.findChild("invite");
221			if (invite != null) {
222				Element pw = x.findChild("password");
223				Jid from = invite.getAttributeAsJid("from");
224				Contact contact = from == null ? null : account.getRoster().getContact(from);
225				return new Invite(message.getAttributeAsJid("from"), pw != null ? pw.getContent() : null, contact);
226			}
227		} else {
228			x = message.findChild("x", "jabber:x:conference");
229			if (x != null) {
230				Jid from = message.getAttributeAsJid("from");
231				Contact contact = from == null ? null : account.getRoster().getContact(from);
232				return new Invite(x.getAttributeAsJid("jid"), x.getAttribute("password"), contact);
233			}
234		}
235		return null;
236	}
237
238	private static String extractStanzaId(Element packet, boolean isTypeGroupChat, Conversation conversation) {
239		final Jid by;
240		final boolean safeToExtract;
241		if (isTypeGroupChat) {
242			by = conversation.getJid().toBareJid();
243			safeToExtract = conversation.getMucOptions().hasFeature(Namespace.STANZA_IDS);
244		} else {
245			Account account = conversation.getAccount();
246			by = account.getJid().toBareJid();
247			safeToExtract = account.getXmppConnection().getFeatures().stanzaIds();
248		}
249		return safeToExtract ? extractStanzaId(packet, by) : null;
250	}
251
252	private static String extractStanzaId(Element packet, Jid by) {
253		for (Element child : packet.getChildren()) {
254			if (child.getName().equals("stanza-id")
255					&& Namespace.STANZA_IDS.equals(child.getNamespace())
256					&& by.equals(child.getAttributeAsJid("by"))) {
257				return child.getAttribute("id");
258			}
259		}
260		return null;
261	}
262
263	private void parseEvent(final Element event, final Jid from, final Account account) {
264		Element items = event.findChild("items");
265		String node = items == null ? null : items.getAttribute("node");
266		if ("urn:xmpp:avatar:metadata".equals(node)) {
267			Avatar avatar = Avatar.parseMetadata(items);
268			if (avatar != null) {
269				avatar.owner = from.toBareJid();
270				if (mXmppConnectionService.getFileBackend().isAvatarCached(avatar)) {
271					if (account.getJid().toBareJid().equals(from)) {
272						if (account.setAvatar(avatar.getFilename())) {
273							mXmppConnectionService.databaseBackend.updateAccount(account);
274						}
275						mXmppConnectionService.getAvatarService().clear(account);
276						mXmppConnectionService.updateConversationUi();
277						mXmppConnectionService.updateAccountUi();
278					} else {
279						Contact contact = account.getRoster().getContact(from);
280						contact.setAvatar(avatar);
281						mXmppConnectionService.getAvatarService().clear(contact);
282						mXmppConnectionService.updateConversationUi();
283						mXmppConnectionService.updateRosterUi();
284					}
285				} else if (mXmppConnectionService.isDataSaverDisabled()) {
286					mXmppConnectionService.fetchAvatar(account, avatar);
287				}
288			}
289		} else if ("http://jabber.org/protocol/nick".equals(node)) {
290			final Element i = items.findChild("item");
291			final String nick = i == null ? null : i.findChildContent("nick", Namespace.NICK);
292			if (nick != null) {
293				Contact contact = account.getRoster().getContact(from);
294				if (contact.setPresenceName(nick)) {
295					mXmppConnectionService.getAvatarService().clear(contact);
296				}
297				mXmppConnectionService.updateConversationUi();
298				mXmppConnectionService.updateAccountUi();
299			}
300		} else if (AxolotlService.PEP_DEVICE_LIST.equals(node)) {
301			Element item = items.findChild("item");
302			Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
303			Log.d(Config.LOGTAG, AxolotlService.getLogprefix(account) + "Received PEP device list " + deviceIds + " update from " + from + ", processing... ");
304			AxolotlService axolotlService = account.getAxolotlService();
305			axolotlService.registerDevices(from, deviceIds);
306			mXmppConnectionService.updateAccountUi();
307		}
308	}
309
310	private boolean handleErrorMessage(Account account, MessagePacket packet) {
311		if (packet.getType() == MessagePacket.TYPE_ERROR) {
312			Jid from = packet.getFrom();
313			if (from != null) {
314				Message message = mXmppConnectionService.markMessage(account,
315						from.toBareJid(),
316						packet.getId(),
317						Message.STATUS_SEND_FAILED,
318						extractErrorMessage(packet));
319				if (message != null) {
320					if (message.getEncryption() == Message.ENCRYPTION_OTR) {
321						message.getConversation().endOtrIfNeeded();
322					}
323				}
324			}
325			return true;
326		}
327		return false;
328	}
329
330	@Override
331	public void onMessagePacketReceived(Account account, MessagePacket original) {
332		if (handleErrorMessage(account, original)) {
333			return;
334		}
335		final MessagePacket packet;
336		Long timestamp = null;
337		final boolean isForwarded;
338		boolean isCarbon = false;
339		String serverMsgId = null;
340		final Element fin = original.findChild("fin", Namespace.MAM_LEGACY);
341		if (fin != null) {
342			mXmppConnectionService.getMessageArchiveService().processFinLegacy(fin, original.getFrom());
343			return;
344		}
345		final boolean mamLegacy = original.hasChild("result", Namespace.MAM_LEGACY);
346		final Element result = original.findChild("result", mamLegacy ? Namespace.MAM_LEGACY : Namespace.MAM);
347		final MessageArchiveService.Query query = result == null ? null : mXmppConnectionService.getMessageArchiveService().findQuery(result.getAttribute("queryid"));
348		if (query != null && query.validFrom(original.getFrom())) {
349			Pair<MessagePacket, Long> f = original.getForwardedMessagePacket("result", mamLegacy ? Namespace.MAM_LEGACY : Namespace.MAM);
350			if (f == null) {
351				return;
352			}
353			timestamp = f.second;
354			packet = f.first;
355			isForwarded = true;
356			serverMsgId = result.getAttribute("id");
357			query.incrementMessageCount();
358		} else if (query != null) {
359			Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": received mam result from invalid sender");
360			return;
361		} else if (original.fromServer(account)) {
362			Pair<MessagePacket, Long> f;
363			f = original.getForwardedMessagePacket("received", "urn:xmpp:carbons:2");
364			f = f == null ? original.getForwardedMessagePacket("sent", "urn:xmpp:carbons:2") : f;
365			packet = f != null ? f.first : original;
366			if (handleErrorMessage(account, packet)) {
367				return;
368			}
369			timestamp = f != null ? f.second : null;
370			isCarbon = f != null;
371			isForwarded = isCarbon;
372		} else {
373			packet = original;
374			isForwarded = false;
375		}
376
377		if (timestamp == null) {
378			timestamp = AbstractParser.parseTimestamp(original, AbstractParser.parseTimestamp(packet));
379		}
380		final String body = packet.getBody();
381		final Element mucUserElement = packet.findChild("x", "http://jabber.org/protocol/muc#user");
382		final String pgpEncrypted = packet.findChildContent("x", "jabber:x:encrypted");
383		final Element replaceElement = packet.findChild("replace", "urn:xmpp:message-correct:0");
384		final Element oob = packet.findChild("x", Namespace.OOB);
385		final String oobUrl = oob != null ? oob.findChildContent("url") : null;
386		final String replacementId = replaceElement == null ? null : replaceElement.getAttribute("id");
387		final Element axolotlEncrypted = packet.findChild(XmppAxolotlMessage.CONTAINERTAG, AxolotlService.PEP_PREFIX);
388		int status;
389		final Jid counterpart;
390		final Jid to = packet.getTo();
391		final Jid from = packet.getFrom();
392		final Element originId = packet.findChild("origin-id", Namespace.STANZA_IDS);
393		final String remoteMsgId;
394		if (originId != null && originId.getAttribute("id") != null) {
395			remoteMsgId = originId.getAttribute("id");
396		} else {
397			remoteMsgId = packet.getId();
398		}
399		boolean notify = false;
400
401		if (from == null) {
402			Log.d(Config.LOGTAG, "no from in: " + packet.toString());
403			return;
404		}
405
406		boolean isTypeGroupChat = packet.getType() == MessagePacket.TYPE_GROUPCHAT;
407		if (query != null && !query.muc() && isTypeGroupChat) {
408			Log.e(Config.LOGTAG,account.getJid().toBareJid()+": received groupchat ("+from+") message on regular MAM request. skipping");
409			return;
410		}
411		boolean isProperlyAddressed = (to != null) && (!to.isBareJid() || account.countPresences() == 0);
412		boolean isMucStatusMessage = from.isBareJid() && mucUserElement != null && mucUserElement.hasChild("status");
413		if (packet.fromAccount(account)) {
414			status = Message.STATUS_SEND;
415			counterpart = to != null ? to : account.getJid();
416		} else {
417			status = Message.STATUS_RECEIVED;
418			counterpart = from;
419		}
420
421		Invite invite = extractInvite(account, packet);
422		if (invite != null && invite.execute(account)) {
423			return;
424		}
425
426		if ((body != null || pgpEncrypted != null || (axolotlEncrypted != null && axolotlEncrypted.hasChild("payload")) || oobUrl != null) && !isMucStatusMessage) {
427			final Conversation conversation = mXmppConnectionService.findOrCreateConversation(account, counterpart.toBareJid(), isTypeGroupChat, false, query, false);
428			final boolean conversationMultiMode = conversation.getMode() == Conversation.MODE_MULTI;
429
430			if (serverMsgId == null) {
431				serverMsgId = extractStanzaId(packet, isTypeGroupChat, conversation);
432			}
433
434			if (isTypeGroupChat) {
435				if (conversation.getMucOptions().isSelf(counterpart)) {
436					status = Message.STATUS_SEND_RECEIVED;
437					isCarbon = true; //not really carbon but received from another resource
438					if (mXmppConnectionService.markMessage(conversation, remoteMsgId, status, serverMsgId)) {
439						return;
440					} else if (remoteMsgId == null || Config.IGNORE_ID_REWRITE_IN_MUC) {
441						Message message = conversation.findSentMessageWithBody(packet.getBody());
442						if (message != null) {
443							mXmppConnectionService.markMessage(message, status);
444							return;
445						}
446					}
447				} else {
448					status = Message.STATUS_RECEIVED;
449				}
450			}
451			final Message message;
452			if (body != null && body.startsWith("?OTR") && Config.supportOtr()) {
453				if (!isForwarded && !isTypeGroupChat && isProperlyAddressed && !conversationMultiMode) {
454					message = parseOtrChat(body, from, remoteMsgId, conversation);
455					if (message == null) {
456						return;
457					}
458				} else {
459					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": ignoring OTR message from " + from + " isForwarded=" + Boolean.toString(isForwarded) + ", isProperlyAddressed=" + Boolean.valueOf(isProperlyAddressed));
460					message = new Message(conversation, body, Message.ENCRYPTION_NONE, status);
461				}
462			} else if (pgpEncrypted != null && Config.supportOpenPgp()) {
463				message = new Message(conversation, pgpEncrypted, Message.ENCRYPTION_PGP, status);
464			} else if (axolotlEncrypted != null && Config.supportOmemo()) {
465				Jid origin;
466				if (conversationMultiMode) {
467					final Jid fallback = conversation.getMucOptions().getTrueCounterpart(counterpart);
468					origin = getTrueCounterpart(query != null ? mucUserElement : null, fallback);
469					if (origin == null) {
470						Log.d(Config.LOGTAG, "axolotl message in non anonymous conference received");
471						return;
472					}
473				} else {
474					origin = from;
475				}
476				message = parseAxolotlChat(axolotlEncrypted, origin, conversation, status, query != null);
477				if (message == null) {
478					if (query == null &&  extractChatState(mXmppConnectionService.find(account, counterpart.toBareJid()), isTypeGroupChat, packet)) {
479						mXmppConnectionService.updateConversationUi();
480					}
481					if (query != null && status == Message.STATUS_SEND && remoteMsgId != null) {
482						Message previouslySent = conversation.findSentMessageWithUuid(remoteMsgId);
483						if (previouslySent != null && previouslySent.getServerMsgId() == null && serverMsgId != null) {
484							previouslySent.setServerMsgId(serverMsgId);
485							mXmppConnectionService.databaseBackend.updateMessage(previouslySent);
486							Log.d(Config.LOGTAG,account.getJid().toBareJid()+": encountered previously sent OMEMO message without serverId. updating...");
487						}
488					}
489					return;
490				}
491				if (conversationMultiMode) {
492					message.setTrueCounterpart(origin);
493				}
494			} else if (body == null && oobUrl != null) {
495				message = new Message(conversation, oobUrl, Message.ENCRYPTION_NONE, status);
496				message.setOob(true);
497				if (CryptoHelper.isPgpEncryptedUrl(oobUrl)) {
498					message.setEncryption(Message.ENCRYPTION_DECRYPTED);
499				}
500			} else {
501				message = new Message(conversation, body, Message.ENCRYPTION_NONE, status);
502			}
503
504			message.setCounterpart(counterpart);
505			message.setRemoteMsgId(remoteMsgId);
506			message.setServerMsgId(serverMsgId);
507			message.setCarbon(isCarbon);
508			message.setTime(timestamp);
509			if (body != null && body.equals(oobUrl)) {
510				message.setOob(true);
511				if (CryptoHelper.isPgpEncryptedUrl(oobUrl)) {
512					message.setEncryption(Message.ENCRYPTION_DECRYPTED);
513				}
514			}
515			message.markable = packet.hasChild("markable", "urn:xmpp:chat-markers:0");
516			if (conversationMultiMode) {
517				final Jid fallback = conversation.getMucOptions().getTrueCounterpart(counterpart);
518				Jid trueCounterpart;
519				if (message.getEncryption() == Message.ENCRYPTION_AXOLOTL) {
520					trueCounterpart = message.getTrueCounterpart();
521				} else if (query != null && query.safeToExtractTrueCounterpart()) {
522					trueCounterpart = getTrueCounterpart(mucUserElement, fallback);
523				} else {
524					trueCounterpart = fallback;
525				}
526				if (trueCounterpart != null && trueCounterpart.toBareJid().equals(account.getJid().toBareJid())) {
527					status = isTypeGroupChat ? Message.STATUS_SEND_RECEIVED : Message.STATUS_SEND;
528				}
529				message.setStatus(status);
530				message.setTrueCounterpart(trueCounterpart);
531				if (!isTypeGroupChat) {
532					message.setType(Message.TYPE_PRIVATE);
533				}
534			} else {
535				updateLastseen(account, from);
536			}
537
538			if (replacementId != null && mXmppConnectionService.allowMessageCorrection()) {
539				final Message replacedMessage = conversation.findMessageWithRemoteIdAndCounterpart(replacementId,
540						counterpart,
541						message.getStatus() == Message.STATUS_RECEIVED,
542						message.isCarbon());
543				if (replacedMessage != null) {
544					final boolean fingerprintsMatch = replacedMessage.getFingerprint() == null
545							|| replacedMessage.getFingerprint().equals(message.getFingerprint());
546					final boolean trueCountersMatch = replacedMessage.getTrueCounterpart() != null
547							&& replacedMessage.getTrueCounterpart().equals(message.getTrueCounterpart());
548					final boolean duplicate = conversation.hasDuplicateMessage(message);
549					if (fingerprintsMatch && (trueCountersMatch || !conversationMultiMode) && !duplicate) {
550						Log.d(Config.LOGTAG, "replaced message '" + replacedMessage.getBody() + "' with '" + message.getBody() + "'");
551						synchronized (replacedMessage) {
552							final String uuid = replacedMessage.getUuid();
553							replacedMessage.setUuid(UUID.randomUUID().toString());
554							replacedMessage.setBody(message.getBody());
555							replacedMessage.setEdited(replacedMessage.getRemoteMsgId());
556							replacedMessage.setRemoteMsgId(remoteMsgId);
557							if (replacedMessage.getServerMsgId() == null || message.getServerMsgId() != null) {
558								replacedMessage.setServerMsgId(message.getServerMsgId());
559							}
560							replacedMessage.setEncryption(message.getEncryption());
561							if (replacedMessage.getStatus() == Message.STATUS_RECEIVED) {
562								replacedMessage.markUnread();
563							}
564							extractChatState(mXmppConnectionService.find(account, counterpart.toBareJid()), isTypeGroupChat, packet);
565							mXmppConnectionService.updateMessage(replacedMessage, uuid);
566							mXmppConnectionService.getNotificationService().updateNotification(false);
567							if (mXmppConnectionService.confirmMessages()
568									&& replacedMessage.getStatus() == Message.STATUS_RECEIVED
569									&& (replacedMessage.trusted() || replacedMessage.getType() == Message.TYPE_PRIVATE)
570									&& remoteMsgId != null
571									&& !isTypeGroupChat) {
572								processMessageReceipts(account, packet, query);
573							}
574							if (replacedMessage.getEncryption() == Message.ENCRYPTION_PGP) {
575								conversation.getAccount().getPgpDecryptionService().discard(replacedMessage);
576								conversation.getAccount().getPgpDecryptionService().decrypt(replacedMessage, false);
577							}
578						}
579						return;
580					} else {
581						Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": received message correction but verification didn't check out");
582					}
583				}
584			}
585
586			long deletionDate = mXmppConnectionService.getAutomaticMessageDeletionDate();
587			if (deletionDate != 0 && message.getTimeSent() < deletionDate) {
588				Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": skipping message from " + message.getCounterpart().toString() + " because it was sent prior to our deletion date");
589				return;
590			}
591
592			boolean checkForDuplicates = (isTypeGroupChat && packet.hasChild("delay", "urn:xmpp:delay"))
593					|| message.getType() == Message.TYPE_PRIVATE
594					|| message.getServerMsgId() != null;
595			if (checkForDuplicates ) {
596				final Message duplicate = conversation.findDuplicateMessage(message);
597				if (duplicate != null) {
598					final boolean serverMsgIdUpdated;
599					if (duplicate.getStatus() != Message.STATUS_RECEIVED
600							&& duplicate.getUuid().equals(message.getRemoteMsgId())
601							&& duplicate.getServerMsgId() == null
602							&& message.getServerMsgId() != null) {
603						duplicate.setServerMsgId(message.getServerMsgId());
604						mXmppConnectionService.databaseBackend.updateMessage(message);
605						serverMsgIdUpdated = true;
606					} else {
607						serverMsgIdUpdated = false;
608					}
609					Log.d(Config.LOGTAG, "skipping duplicate message with " + message.getCounterpart()+". serverMsgIdUpdated="+Boolean.toString(serverMsgIdUpdated));
610					return;
611				}
612			}
613
614			if (query != null && query.getPagingOrder() == MessageArchiveService.PagingOrder.REVERSE) {
615				conversation.prepend(message);
616			} else {
617				conversation.add(message);
618			}
619			if (query != null) {
620				query.incrementActualMessageCount();
621			}
622
623			if (query == null || query.isCatchup()) { //either no mam or catchup
624				if (status == Message.STATUS_SEND || status == Message.STATUS_SEND_RECEIVED) {
625					mXmppConnectionService.markRead(conversation);
626					if (query == null) {
627						activateGracePeriod(account);
628					}
629				} else {
630					message.markUnread();
631					notify = true;
632				}
633			}
634
635			if (message.getEncryption() == Message.ENCRYPTION_PGP) {
636				notify = conversation.getAccount().getPgpDecryptionService().decrypt(message, notify);
637			}
638
639			if (query == null) {
640				extractChatState(mXmppConnectionService.find(account, counterpart.toBareJid()), isTypeGroupChat, packet);
641				mXmppConnectionService.updateConversationUi();
642			}
643
644			if (mXmppConnectionService.confirmMessages()
645					&& message.getStatus() == Message.STATUS_RECEIVED
646					&& (message.trusted() || message.getType() == Message.TYPE_PRIVATE)
647					&& remoteMsgId != null
648					&& !isTypeGroupChat) {
649				processMessageReceipts(account, packet, query);
650			}
651
652			if (message.getStatus() == Message.STATUS_RECEIVED
653					&& conversation.getOtrSession() != null
654					&& !conversation.getOtrSession().getSessionID().getUserID()
655					.equals(message.getCounterpart().getResourcepart())) {
656				conversation.endOtrIfNeeded();
657			}
658
659			mXmppConnectionService.databaseBackend.createMessage(message);
660			final HttpConnectionManager manager = this.mXmppConnectionService.getHttpConnectionManager();
661			if (message.trusted() && message.treatAsDownloadable() && manager.getAutoAcceptFileSize() > 0) {
662				manager.createNewDownloadConnection(message);
663			} else if (notify) {
664				if (query != null && query.isCatchup()) {
665					mXmppConnectionService.getNotificationService().pushFromBacklog(message);
666				} else {
667					mXmppConnectionService.getNotificationService().push(message);
668				}
669			}
670		} else if (!packet.hasChild("body")) { //no body
671
672			final Conversation conversation = mXmppConnectionService.find(account, from.toBareJid());
673			if (axolotlEncrypted != null) {
674				Jid origin;
675				if (conversation != null && conversation.getMode() == Conversation.MODE_MULTI) {
676					final Jid fallback = conversation.getMucOptions().getTrueCounterpart(counterpart);
677					origin = getTrueCounterpart(query != null ? mucUserElement : null, fallback);
678					if (origin == null) {
679						Log.d(Config.LOGTAG, "omemo key transport message in non anonymous conference received");
680						return;
681					}
682				} else if (isTypeGroupChat) {
683					return;
684				} else {
685					origin = from;
686				}
687				try {
688					final XmppAxolotlMessage xmppAxolotlMessage = XmppAxolotlMessage.fromElement(axolotlEncrypted, origin.toBareJid());
689					account.getAxolotlService().processReceivingKeyTransportMessage(xmppAxolotlMessage, query != null);
690					Log.d(Config.LOGTAG,account.getJid().toBareJid()+": omemo key transport message received from "+origin);
691				} catch (Exception e) {
692					Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": invalid omemo key transport message received " + e.getMessage());
693					return;
694				}
695			}
696
697			if (query == null && extractChatState(mXmppConnectionService.find(account, counterpart.toBareJid()), isTypeGroupChat, packet)) {
698				mXmppConnectionService.updateConversationUi();
699			}
700
701			if (isTypeGroupChat) {
702				if (packet.hasChild("subject")) {
703					if (conversation != null && conversation.getMode() == Conversation.MODE_MULTI) {
704						conversation.setHasMessagesLeftOnServer(conversation.countMessages() > 0);
705						String subject = packet.findChildContent("subject");
706						if (conversation.getMucOptions().setSubject(subject)) {
707							mXmppConnectionService.updateConversation(conversation);
708						}
709						final Bookmark bookmark = conversation.getBookmark();
710						if (bookmark != null && bookmark.getBookmarkName() == null) {
711							if (bookmark.setBookmarkName(subject)) {
712								mXmppConnectionService.pushBookmarks(account);
713							}
714						}
715						mXmppConnectionService.updateConversationUi();
716						return;
717					}
718				}
719			}
720			if (conversation != null && mucUserElement != null && from.isBareJid()) {
721				for (Element child : mucUserElement.getChildren()) {
722					if ("status".equals(child.getName())) {
723						try {
724							int code = Integer.parseInt(child.getAttribute("code"));
725							if ((code >= 170 && code <= 174) || (code >= 102 && code <= 104)) {
726								mXmppConnectionService.fetchConferenceConfiguration(conversation);
727								break;
728							}
729						} catch (Exception e) {
730							//ignored
731						}
732					} else if ("item".equals(child.getName())) {
733						MucOptions.User user = AbstractParser.parseItem(conversation, child);
734						Log.d(Config.LOGTAG, account.getJid() + ": changing affiliation for "
735								+ user.getRealJid() + " to " + user.getAffiliation() + " in "
736								+ conversation.getJid().toBareJid());
737						if (!user.realJidMatchesAccount()) {
738							boolean isNew = conversation.getMucOptions().updateUser(user);
739							mXmppConnectionService.getAvatarService().clear(conversation);
740							mXmppConnectionService.updateMucRosterUi();
741							mXmppConnectionService.updateConversationUi();
742							if (!user.getAffiliation().ranks(MucOptions.Affiliation.MEMBER)) {
743								Jid jid = user.getRealJid();
744								List<Jid> cryptoTargets = conversation.getAcceptedCryptoTargets();
745								if (cryptoTargets.remove(user.getRealJid())) {
746									Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": removed " + jid + " from crypto targets of " + conversation.getName());
747									conversation.setAcceptedCryptoTargets(cryptoTargets);
748									mXmppConnectionService.updateConversation(conversation);
749								}
750							} else if (isNew && user.getRealJid() != null && account.getAxolotlService().hasEmptyDeviceList(user.getRealJid())) {
751								account.getAxolotlService().fetchDeviceIds(user.getRealJid());
752							}
753						}
754					}
755				}
756			}
757		}
758
759		Element received = packet.findChild("received", "urn:xmpp:chat-markers:0");
760		if (received == null) {
761			received = packet.findChild("received", "urn:xmpp:receipts");
762		}
763		if (received != null) {
764			String id = received.getAttribute("id");
765			if (packet.fromAccount(account)) {
766				if (query != null && id != null && packet.getTo() != null) {
767					query.pendingReceiptRequests.remove(new ReceiptRequest(packet.getTo(),id));
768				}
769			} else {
770				mXmppConnectionService.markMessage(account, from.toBareJid(), received.getAttribute("id"), Message.STATUS_SEND_RECEIVED);
771			}
772		}
773		Element displayed = packet.findChild("displayed", "urn:xmpp:chat-markers:0");
774		if (displayed != null) {
775			final String id = displayed.getAttribute("id");
776			final Jid sender = displayed.getAttributeAsJid("sender");
777			if (packet.fromAccount(account)) {
778				Conversation conversation = mXmppConnectionService.find(account, counterpart.toBareJid());
779				if (conversation != null && (query == null || query.isCatchup())) {
780					mXmppConnectionService.markRead(conversation); //TODO only mark messages read that are older than timestamp
781				}
782			} else if (isTypeGroupChat) {
783				Conversation conversation = mXmppConnectionService.find(account, counterpart.toBareJid());
784				if (conversation != null && id != null && sender != null) {
785					Message message = conversation.findMessageWithRemoteId(id, sender);
786					if (message != null) {
787						final Jid fallback = conversation.getMucOptions().getTrueCounterpart(counterpart);
788						final Jid trueJid = getTrueCounterpart((query != null && query.safeToExtractTrueCounterpart()) ? mucUserElement : null, fallback);
789						final boolean trueJidMatchesAccount = account.getJid().toBareJid().equals(trueJid == null ? null : trueJid.toBareJid());
790						if (trueJidMatchesAccount || conversation.getMucOptions().isSelf(counterpart)) {
791							if (!message.isRead() && (query == null || query.isCatchup())) { //checking if message is unread fixes race conditions with reflections
792								mXmppConnectionService.markRead(conversation);
793							}
794						} else  if (!counterpart.isBareJid() && trueJid != null){
795							ReadByMarker readByMarker = ReadByMarker.from(counterpart, trueJid);
796							if (message.addReadByMarker(readByMarker)) {
797								Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": added read by (" + readByMarker.getRealJid() + ") to message '" + message.getBody() + "'");
798								mXmppConnectionService.updateMessage(message);
799							}
800						}
801					}
802				}
803			} else {
804				final Message displayedMessage = mXmppConnectionService.markMessage(account, from.toBareJid(), id, Message.STATUS_SEND_DISPLAYED);
805				Message message = displayedMessage == null ? null : displayedMessage.prev();
806				while (message != null
807						&& message.getStatus() == Message.STATUS_SEND_RECEIVED
808						&& message.getTimeSent() < displayedMessage.getTimeSent()) {
809					mXmppConnectionService.markMessage(message, Message.STATUS_SEND_DISPLAYED);
810					message = message.prev();
811				}
812			}
813		}
814
815		Element event = original.findChild("event", "http://jabber.org/protocol/pubsub#event");
816		if (event != null) {
817			parseEvent(event, original.getFrom(), account);
818		}
819
820		final String nick = packet.findChildContent("nick", Namespace.NICK);
821		if (nick != null) {
822			Contact contact = account.getRoster().getContact(from);
823			if (contact.setPresenceName(nick)) {
824				mXmppConnectionService.getAvatarService().clear(contact);
825			}
826		}
827	}
828
829	private static Jid getTrueCounterpart(Element mucUserElement, Jid fallback) {
830		final Element item = mucUserElement == null ? null : mucUserElement.findChild("item");
831		Jid result = item == null ? null : item.getAttributeAsJid("jid");
832		return result != null ? result : fallback;
833	}
834
835	private void processMessageReceipts(Account account, MessagePacket packet, MessageArchiveService.Query query) {
836		final boolean markable = packet.hasChild("markable", "urn:xmpp:chat-markers:0");
837		final boolean request = packet.hasChild("request", "urn:xmpp:receipts");
838		if (query == null) {
839			final ArrayList<String> receiptsNamespaces = new ArrayList<>();
840			if (markable) {
841				receiptsNamespaces.add("urn:xmpp:chat-markers:0");
842			}
843			if (request) {
844				receiptsNamespaces.add("urn:xmpp:receipts");
845			}
846			if (receiptsNamespaces.size() > 0) {
847				MessagePacket receipt = mXmppConnectionService.getMessageGenerator().received(account,
848						packet,
849						receiptsNamespaces,
850						packet.getType());
851				mXmppConnectionService.sendMessagePacket(account, receipt);
852			}
853		} else {
854			if (request) {
855				query.pendingReceiptRequests.add(new ReceiptRequest(packet.getFrom(),packet.getId()));
856			}
857		}
858	}
859
860	private static final SimpleDateFormat TIME_FORMAT = new SimpleDateFormat("HH:mm:ss", Locale.ENGLISH);
861
862	private void activateGracePeriod(Account account) {
863		long duration = mXmppConnectionService.getLongPreference("grace_period_length", R.integer.grace_period) * 1000;
864		Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": activating grace period till " + TIME_FORMAT.format(new Date(System.currentTimeMillis() + duration)));
865		account.activateGracePeriod(duration);
866	}
867}