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