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