1package eu.siacs.conversations.parser;
  2
  3import android.os.SystemClock;
  4import net.java.otr4j.session.Session;
  5import net.java.otr4j.session.SessionStatus;
  6import eu.siacs.conversations.Config;
  7import eu.siacs.conversations.entities.Account;
  8import eu.siacs.conversations.entities.Contact;
  9import eu.siacs.conversations.entities.Conversation;
 10import eu.siacs.conversations.entities.Message;
 11import eu.siacs.conversations.services.XmppConnectionService;
 12import eu.siacs.conversations.utils.CryptoHelper;
 13import eu.siacs.conversations.xml.Element;
 14import eu.siacs.conversations.xmpp.OnMessagePacketReceived;
 15import eu.siacs.conversations.xmpp.pep.Avatar;
 16import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 17
 18public class MessageParser extends AbstractParser implements
 19		OnMessagePacketReceived {
 20
 21	private long lastCarbonMessageReceived = -(Config.CARBON_GRACE_PERIOD * 1000);
 22
 23	public MessageParser(XmppConnectionService service) {
 24		super(service);
 25	}
 26
 27	private Message parseChat(MessagePacket packet, Account account) {
 28		String[] fromParts = packet.getFrom().split("/");
 29		Conversation conversation = mXmppConnectionService
 30				.findOrCreateConversation(account, fromParts[0], false);
 31		conversation.setLatestMarkableMessageId(getMarkableMessageId(packet));
 32		updateLastseen(packet, account, true);
 33		String pgpBody = getPgpBody(packet);
 34		Message finishedMessage;
 35		if (pgpBody != null) {
 36			finishedMessage = new Message(conversation, packet.getFrom(),
 37					pgpBody, Message.ENCRYPTION_PGP, Message.STATUS_RECEIVED);
 38		} else {
 39			finishedMessage = new Message(conversation, packet.getFrom(),
 40					packet.getBody(), Message.ENCRYPTION_NONE,
 41					Message.STATUS_RECEIVED);
 42		}
 43		finishedMessage.setRemoteMsgId(packet.getId());
 44		if (conversation.getMode() == Conversation.MODE_MULTI
 45				&& fromParts.length >= 2) {
 46			finishedMessage.setType(Message.TYPE_PRIVATE);
 47			finishedMessage.setPresence(fromParts[1]);
 48			finishedMessage.setTrueCounterpart(conversation.getMucOptions()
 49					.getTrueCounterpart(fromParts[1]));
 50			if (conversation.hasDuplicateMessage(finishedMessage)) {
 51				return null;
 52			}
 53
 54		}
 55		finishedMessage.setTime(getTimestamp(packet));
 56		return finishedMessage;
 57	}
 58
 59	private Message parseOtrChat(MessagePacket packet, Account account) {
 60		boolean properlyAddressed = (packet.getTo().split("/").length == 2)
 61				|| (account.countPresences() == 1);
 62		String[] fromParts = packet.getFrom().split("/");
 63		Conversation conversation = mXmppConnectionService
 64				.findOrCreateConversation(account, fromParts[0], false);
 65		String presence;
 66		if (fromParts.length >= 2) {
 67			presence = fromParts[1];
 68		} else {
 69			presence = "";
 70		}
 71		updateLastseen(packet, account, true);
 72		String body = packet.getBody();
 73		if (body.matches("^\\?OTRv\\d*\\?")) {
 74			conversation.resetOtrSession();
 75		}
 76		if (!conversation.hasValidOtrSession()) {
 77			if (properlyAddressed) {
 78				conversation.startOtrSession(mXmppConnectionService, presence,
 79						false);
 80			} else {
 81				return null;
 82			}
 83		} else {
 84			String foreignPresence = conversation.getOtrSession()
 85					.getSessionID().getUserID();
 86			if (!foreignPresence.equals(presence)) {
 87				conversation.endOtrIfNeeded();
 88				if (properlyAddressed) {
 89					conversation.startOtrSession(mXmppConnectionService,
 90							presence, false);
 91				} else {
 92					return null;
 93				}
 94			}
 95		}
 96		try {
 97			Session otrSession = conversation.getOtrSession();
 98			SessionStatus before = otrSession.getSessionStatus();
 99			body = otrSession.transformReceiving(body);
100			SessionStatus after = otrSession.getSessionStatus();
101			if ((before != after) && (after == SessionStatus.ENCRYPTED)) {
102				mXmppConnectionService.onOtrSessionEstablished(conversation);
103			} else if ((before != after) && (after == SessionStatus.FINISHED)) {
104				conversation.resetOtrSession();
105				mXmppConnectionService.updateConversationUi();
106			}
107			if ((body == null) || (body.isEmpty())) {
108				return null;
109			}
110			if (body.startsWith(CryptoHelper.FILETRANSFER)) {
111				String key = body.substring(CryptoHelper.FILETRANSFER.length());
112				conversation.setSymmetricKey(CryptoHelper.hexToBytes(key));
113				return null;
114			}
115			conversation
116					.setLatestMarkableMessageId(getMarkableMessageId(packet));
117			Message finishedMessage = new Message(conversation,
118					packet.getFrom(), body, Message.ENCRYPTION_OTR,
119					Message.STATUS_RECEIVED);
120			finishedMessage.setTime(getTimestamp(packet));
121			finishedMessage.setRemoteMsgId(packet.getId());
122			return finishedMessage;
123		} catch (Exception e) {
124			String receivedId = packet.getId();
125			if (receivedId != null) {
126				mXmppConnectionService.replyWithNotAcceptable(account, packet);
127			}
128			conversation.resetOtrSession();
129			return null;
130		}
131	}
132
133	private Message parseGroupchat(MessagePacket packet, Account account) {
134		int status;
135		String[] fromParts = packet.getFrom().split("/");
136		if (mXmppConnectionService.find(account.pendingConferenceLeaves,
137				account, fromParts[0]) != null) {
138			return null;
139		}
140		Conversation conversation = mXmppConnectionService
141				.findOrCreateConversation(account, fromParts[0], true);
142		if (packet.hasChild("subject")) {
143			conversation.getMucOptions().setSubject(
144					packet.findChild("subject").getContent());
145			mXmppConnectionService.updateConversationUi();
146			return null;
147		}
148		if ((fromParts.length == 1)) {
149			return null;
150		}
151		String counterPart = fromParts[1];
152		if (counterPart.equals(conversation.getMucOptions().getActualNick())) {
153			if (mXmppConnectionService.markMessage(conversation,
154					packet.getId(), Message.STATUS_SEND)) {
155				return null;
156			} else {
157				status = Message.STATUS_SEND;
158			}
159		} else {
160			status = Message.STATUS_RECEIVED;
161		}
162		String pgpBody = getPgpBody(packet);
163		conversation.setLatestMarkableMessageId(getMarkableMessageId(packet));
164		Message finishedMessage;
165		if (pgpBody == null) {
166			finishedMessage = new Message(conversation, counterPart,
167					packet.getBody(), Message.ENCRYPTION_NONE, status);
168		} else {
169			finishedMessage = new Message(conversation, counterPart, pgpBody,
170					Message.ENCRYPTION_PGP, status);
171		}
172		finishedMessage.setRemoteMsgId(packet.getId());
173		if (status == Message.STATUS_RECEIVED) {
174			finishedMessage.setTrueCounterpart(conversation.getMucOptions()
175					.getTrueCounterpart(counterPart));
176		}
177		if (packet.hasChild("delay")
178				&& conversation.hasDuplicateMessage(finishedMessage)) {
179			return null;
180		}
181		finishedMessage.setTime(getTimestamp(packet));
182		return finishedMessage;
183	}
184
185	private Message parseCarbonMessage(MessagePacket packet, Account account) {
186		int status;
187		String fullJid;
188		Element forwarded;
189		if (packet.hasChild("received")) {
190			forwarded = packet.findChild("received").findChild("forwarded");
191			status = Message.STATUS_RECEIVED;
192		} else if (packet.hasChild("sent")) {
193			forwarded = packet.findChild("sent").findChild("forwarded");
194			status = Message.STATUS_SEND;
195		} else {
196			return null;
197		}
198		if (forwarded == null) {
199			return null;
200		}
201		Element message = forwarded.findChild("message");
202		if ((message == null) || (!message.hasChild("body"))) {
203			if (status == Message.STATUS_RECEIVED
204					&& message.getAttribute("from") != null) {
205				parseNonMessage(message, account);
206			}
207			return null;
208		}
209		if (status == Message.STATUS_RECEIVED) {
210			fullJid = message.getAttribute("from");
211			if (fullJid == null) {
212				return null;
213			} else {
214				updateLastseen(message, account, true);
215			}
216		} else {
217			fullJid = message.getAttribute("to");
218			if (fullJid == null) {
219				return null;
220			}
221		}
222		String[] parts = fullJid.split("/");
223		Conversation conversation = mXmppConnectionService
224				.findOrCreateConversation(account, parts[0], false);
225		conversation.setLatestMarkableMessageId(getMarkableMessageId(packet));
226
227		String pgpBody = getPgpBody(message);
228		Message finishedMessage;
229		if (pgpBody != null) {
230			finishedMessage = new Message(conversation, fullJid, pgpBody,
231					Message.ENCRYPTION_PGP, status);
232		} else {
233			String body = message.findChild("body").getContent();
234			finishedMessage = new Message(conversation, fullJid, body,
235					Message.ENCRYPTION_NONE, status);
236		}
237		finishedMessage.setTime(getTimestamp(message));
238		finishedMessage.setRemoteMsgId(message.getAttribute("id"));
239		if (conversation.getMode() == Conversation.MODE_MULTI
240				&& parts.length >= 2) {
241			finishedMessage.setType(Message.TYPE_PRIVATE);
242			finishedMessage.setPresence(parts[1]);
243			finishedMessage.setTrueCounterpart(conversation.getMucOptions()
244					.getTrueCounterpart(parts[1]));
245			if (conversation.hasDuplicateMessage(finishedMessage)) {
246				return null;
247			}
248		}
249
250		return finishedMessage;
251	}
252
253	private void parseError(MessagePacket packet, Account account) {
254		String[] fromParts = packet.getFrom().split("/");
255		mXmppConnectionService.markMessage(account, fromParts[0],
256				packet.getId(), Message.STATUS_SEND_FAILED);
257	}
258
259	private void parseNonMessage(Element packet, Account account) {
260		if (packet.hasChild("event", "http://jabber.org/protocol/pubsub#event")) {
261			Element event = packet.findChild("event",
262					"http://jabber.org/protocol/pubsub#event");
263			parseEvent(event, packet.getAttribute("from"), account);
264		} else if (packet.hasChild("displayed", "urn:xmpp:chat-markers:0")) {
265			String id = packet
266					.findChild("displayed", "urn:xmpp:chat-markers:0")
267					.getAttribute("id");
268			String[] fromParts = packet.getAttribute("from").split("/");
269			updateLastseen(packet, account, true);
270			mXmppConnectionService.markMessage(account, fromParts[0], id,
271					Message.STATUS_SEND_DISPLAYED);
272		} else if (packet.hasChild("received", "urn:xmpp:chat-markers:0")) {
273			String id = packet.findChild("received", "urn:xmpp:chat-markers:0")
274					.getAttribute("id");
275			String[] fromParts = packet.getAttribute("from").split("/");
276			updateLastseen(packet, account, false);
277			mXmppConnectionService.markMessage(account, fromParts[0], id,
278					Message.STATUS_SEND_RECEIVED);
279		} else if (packet.hasChild("x", "http://jabber.org/protocol/muc#user")) {
280			Element x = packet.findChild("x",
281					"http://jabber.org/protocol/muc#user");
282			if (x.hasChild("invite")) {
283				Conversation conversation = mXmppConnectionService
284						.findOrCreateConversation(account,
285								packet.getAttribute("from"), true);
286				if (!conversation.getMucOptions().online()) {
287					if (x.hasChild("password")) {
288						Element password = x.findChild("password");
289						conversation.getMucOptions().setPassword(
290								password.getContent());
291					}
292					mXmppConnectionService.joinMuc(conversation);
293					mXmppConnectionService.updateConversationUi();
294				}
295			}
296		} else if (packet.hasChild("x", "jabber:x:conference")) {
297			Element x = packet.findChild("x", "jabber:x:conference");
298			String jid = x.getAttribute("jid");
299			String password = x.getAttribute("password");
300			if (jid != null) {
301				Conversation conversation = mXmppConnectionService
302						.findOrCreateConversation(account, jid, true);
303				if (!conversation.getMucOptions().online()) {
304					if (password != null) {
305						conversation.getMucOptions().setPassword(password);
306					}
307					mXmppConnectionService.joinMuc(conversation);
308					mXmppConnectionService.updateConversationUi();
309				}
310			}
311		}
312	}
313
314	private void parseEvent(Element event, String from, Account account) {
315		Element items = event.findChild("items");
316		String node = items.getAttribute("node");
317		if (node != null) {
318			if (node.equals("urn:xmpp:avatar:metadata")) {
319				Avatar avatar = Avatar.parseMetadata(items);
320				if (avatar != null) {
321					avatar.owner = from;
322					if (mXmppConnectionService.getFileBackend().isAvatarCached(
323							avatar)) {
324						if (account.getJid().equals(from)) {
325							if (account.setAvatar(avatar.getFilename())) {
326								mXmppConnectionService.databaseBackend
327										.updateAccount(account);
328							}
329						} else {
330							Contact contact = account.getRoster().getContact(
331									from);
332							contact.setAvatar(avatar.getFilename());
333						}
334					} else {
335						mXmppConnectionService.fetchAvatar(account, avatar);
336					}
337				}
338			} else if (node.equals("http://jabber.org/protocol/nick")) {
339				Element item = items.findChild("item");
340				if (item != null) {
341					Element nick = item.findChild("nick",
342							"http://jabber.org/protocol/nick");
343					if (nick != null) {
344						if (from != null) {
345							Contact contact = account.getRoster().getContact(
346									from);
347							contact.setPresenceName(nick.getContent());
348						}
349					}
350				}
351			}
352		}
353	}
354
355	private String getPgpBody(Element message) {
356		Element child = message.findChild("x", "jabber:x:encrypted");
357		if (child == null) {
358			return null;
359		} else {
360			return child.getContent();
361		}
362	}
363
364	private String getMarkableMessageId(Element message) {
365		if (message.hasChild("markable", "urn:xmpp:chat-markers:0")) {
366			return message.getAttribute("id");
367		} else {
368			return null;
369		}
370	}
371
372	@Override
373	public void onMessagePacketReceived(Account account, MessagePacket packet) {
374		Message message = null;
375		boolean notify = true;
376		if (mXmppConnectionService.getPreferences().getBoolean(
377				"notification_grace_period_after_carbon_received", true)) {
378			notify = (SystemClock.elapsedRealtime() - lastCarbonMessageReceived) > (Config.CARBON_GRACE_PERIOD * 1000);
379		}
380
381		this.parseNick(packet, account);
382
383		if ((packet.getType() == MessagePacket.TYPE_CHAT || packet.getType() == MessagePacket.TYPE_NORMAL)) {
384			if ((packet.getBody() != null)
385					&& (packet.getBody().startsWith("?OTR"))) {
386				message = this.parseOtrChat(packet, account);
387				if (message != null) {
388					message.markUnread();
389				}
390			} else if (packet.hasChild("body")) {
391				message = this.parseChat(packet, account);
392				if (message != null) {
393					message.markUnread();
394				}
395			} else if (packet.hasChild("received") || (packet.hasChild("sent"))) {
396				message = this.parseCarbonMessage(packet, account);
397				if (message != null) {
398					if (message.getStatus() == Message.STATUS_SEND) {
399						lastCarbonMessageReceived = SystemClock
400								.elapsedRealtime();
401						notify = false;
402						message.getConversation().markRead();
403					} else {
404						message.markUnread();
405					}
406				}
407			} else {
408				parseNonMessage(packet, account);
409			}
410		} else if (packet.getType() == MessagePacket.TYPE_GROUPCHAT) {
411			message = this.parseGroupchat(packet, account);
412			if (message != null) {
413				if (message.getStatus() == Message.STATUS_RECEIVED) {
414					message.markUnread();
415				} else {
416					message.getConversation().markRead();
417					lastCarbonMessageReceived = SystemClock.elapsedRealtime();
418					notify = false;
419				}
420			}
421		} else if (packet.getType() == MessagePacket.TYPE_ERROR) {
422			this.parseError(packet, account);
423			return;
424		} else if (packet.getType() == MessagePacket.TYPE_HEADLINE) {
425			this.parseHeadline(packet, account);
426			return;
427		}
428		if ((message == null) || (message.getBody() == null)) {
429			return;
430		}
431		if ((mXmppConnectionService.confirmMessages())
432				&& ((packet.getId() != null))) {
433			if (packet.hasChild("markable", "urn:xmpp:chat-markers:0")) {
434				MessagePacket receipt = mXmppConnectionService
435						.getMessageGenerator().received(account, packet,
436								"urn:xmpp:chat-markers:0");
437				mXmppConnectionService.sendMessagePacket(account, receipt);
438			}
439			if (packet.hasChild("request", "urn:xmpp:receipts")) {
440				MessagePacket receipt = mXmppConnectionService
441						.getMessageGenerator().received(account, packet,
442								"urn:xmpp:receipts");
443				mXmppConnectionService.sendMessagePacket(account, receipt);
444			}
445		}
446		Conversation conversation = message.getConversation();
447		conversation.getMessages().add(message);
448		if (packet.getType() != MessagePacket.TYPE_ERROR) {
449			if (message.getEncryption() == Message.ENCRYPTION_NONE
450					|| mXmppConnectionService.saveEncryptedMessages()) {
451				mXmppConnectionService.databaseBackend.createMessage(message);
452			}
453		}
454		notify = notify && !conversation.isMuted();
455		mXmppConnectionService.notifyUi(conversation, notify);
456	}
457
458	private void parseHeadline(MessagePacket packet, Account account) {
459		if (packet.hasChild("event", "http://jabber.org/protocol/pubsub#event")) {
460			Element event = packet.findChild("event",
461					"http://jabber.org/protocol/pubsub#event");
462			parseEvent(event, packet.getFrom(), account);
463		}
464	}
465
466	private void parseNick(MessagePacket packet, Account account) {
467		Element nick = packet.findChild("nick",
468				"http://jabber.org/protocol/nick");
469		if (nick != null) {
470			if (packet.getFrom() != null) {
471				Contact contact = account.getRoster().getContact(
472						packet.getFrom());
473				contact.setPresenceName(nick.getContent());
474			}
475		}
476	}
477}