1package eu.siacs.conversations.services;
  2
  3import android.util.Log;
  4
  5import java.math.BigInteger;
  6import java.util.ArrayList;
  7import java.util.HashSet;
  8import java.util.Iterator;
  9import java.util.List;
 10
 11import eu.siacs.conversations.Config;
 12import eu.siacs.conversations.R;
 13import eu.siacs.conversations.entities.Account;
 14import eu.siacs.conversations.entities.Conversation;
 15import eu.siacs.conversations.entities.Conversational;
 16import eu.siacs.conversations.entities.ReceiptRequest;
 17import eu.siacs.conversations.generator.AbstractGenerator;
 18import eu.siacs.conversations.xml.Namespace;
 19import eu.siacs.conversations.xml.Element;
 20import eu.siacs.conversations.xmpp.OnAdvancedStreamFeaturesLoaded;
 21import eu.siacs.conversations.xmpp.mam.MamReference;
 22import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 23import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
 24import rocks.xmpp.addr.Jid;
 25
 26public class MessageArchiveService implements OnAdvancedStreamFeaturesLoaded {
 27
 28	private final XmppConnectionService mXmppConnectionService;
 29
 30	private final HashSet<Query> queries = new HashSet<>();
 31	private final ArrayList<Query> pendingQueries = new ArrayList<>();
 32
 33	public enum Version {
 34		MAM_0("urn:xmpp:mam:0", true),
 35		MAM_1("urn:xmpp:mam:1", false),
 36		MAM_2("urn:xmpp:mam:2", false);
 37
 38		public final boolean legacy;
 39		public final String namespace;
 40
 41		Version(String namespace, boolean legacy) {
 42			this.namespace = namespace;
 43			this.legacy = legacy;
 44		}
 45
 46		public static Version get(Account account) {
 47			return get(account,null);
 48		}
 49
 50		public static Version get(Account account, Conversation conversation) {
 51			if (conversation == null || conversation.getMode() == Conversation.MODE_SINGLE) {
 52				return get(account.getXmppConnection().getFeatures().getAccountFeatures());
 53			} else {
 54				return get(conversation.getMucOptions().getFeatures());
 55			}
 56		}
 57
 58		private static Version get(List<String> features) {
 59			final Version[] values = values();
 60			for(int i = values.length -1; i >= 0; --i) {
 61				for(String feature : features) {
 62					if (values[i].namespace.equals(feature)) {
 63						return values[i];
 64					}
 65				}
 66			}
 67			return MAM_0;
 68		}
 69
 70		public static boolean has(List<String> features) {
 71			for(String feature : features) {
 72				for(Version version : values()) {
 73					if (version.namespace.equals(feature)) {
 74						return true;
 75					}
 76				}
 77			}
 78			return false;
 79		}
 80
 81		public static Element findResult(MessagePacket packet) {
 82			for(Version version : values()) {
 83				Element result = packet.findChild("result", version.namespace);
 84				if (result != null) {
 85					return result;
 86				}
 87			}
 88			return null;
 89		}
 90
 91	};
 92
 93	MessageArchiveService(final XmppConnectionService service) {
 94		this.mXmppConnectionService = service;
 95	}
 96
 97	private void catchup(final Account account) {
 98		synchronized (this.queries) {
 99			for (Iterator<Query> iterator = this.queries.iterator(); iterator.hasNext(); ) {
100				Query query = iterator.next();
101				if (query.getAccount() == account) {
102					iterator.remove();
103				}
104			}
105		}
106		MamReference mamReference = MamReference.max(
107				mXmppConnectionService.databaseBackend.getLastMessageReceived(account),
108				mXmppConnectionService.databaseBackend.getLastClearDate(account)
109		);
110		mamReference = MamReference.max(mamReference, mXmppConnectionService.getAutomaticMessageDeletionDate());
111		long endCatchup = account.getXmppConnection().getLastSessionEstablished();
112		final Query query;
113		if (mamReference.getTimestamp() == 0) {
114			return;
115		} else if (endCatchup - mamReference.getTimestamp() >= Config.MAM_MAX_CATCHUP) {
116			long startCatchup = endCatchup - Config.MAM_MAX_CATCHUP;
117			List<Conversation> conversations = mXmppConnectionService.getConversations();
118			for (Conversation conversation : conversations) {
119				if (conversation.getMode() == Conversation.MODE_SINGLE && conversation.getAccount() == account && startCatchup > conversation.getLastMessageTransmitted().getTimestamp()) {
120					this.query(conversation, startCatchup, true);
121				}
122			}
123			query = new Query(account, new MamReference(startCatchup), 0);
124		} else {
125			query = new Query(account, mamReference, 0);
126		}
127		synchronized (this.queries) {
128			this.queries.add(query);
129		}
130		this.execute(query);
131	}
132
133	void catchupMUC(final Conversation conversation) {
134		if (conversation.getLastMessageTransmitted().getTimestamp() < 0 && conversation.countMessages() == 0) {
135			query(conversation,
136					new MamReference(0),
137					0,
138					true);
139		} else {
140			query(conversation,
141					conversation.getLastMessageTransmitted(),
142					0,
143					true);
144		}
145	}
146
147	public Query query(final Conversation conversation) {
148		if (conversation.getLastMessageTransmitted().getTimestamp() < 0 && conversation.countMessages() == 0) {
149			return query(conversation,
150					new MamReference(0),
151					System.currentTimeMillis(),
152					false);
153		} else {
154			return query(conversation,
155					conversation.getLastMessageTransmitted(),
156					conversation.getAccount().getXmppConnection().getLastSessionEstablished(),
157					false);
158		}
159	}
160
161	public boolean isCatchingUp(Conversation conversation) {
162		final Account account = conversation.getAccount();
163		if (account.getXmppConnection().isWaitingForSmCatchup()) {
164			return true;
165		} else {
166			synchronized (this.queries) {
167				for (Query query : this.queries) {
168					if (query.getAccount() == account && query.isCatchup() && ((conversation.getMode() == Conversation.MODE_SINGLE && query.getWith() == null) || query.getConversation() == conversation)) {
169						return true;
170					}
171				}
172			}
173			return false;
174		}
175	}
176
177	public Query query(final Conversation conversation, long end, boolean allowCatchup) {
178		return this.query(conversation, conversation.getLastMessageTransmitted(), end, allowCatchup);
179	}
180
181	public Query query(Conversation conversation, MamReference start, long end, boolean allowCatchup) {
182		synchronized (this.queries) {
183			final Query query;
184			final MamReference startActual = MamReference.max(start, mXmppConnectionService.getAutomaticMessageDeletionDate());
185			if (start.getTimestamp() == 0) {
186				query = new Query(conversation, startActual, end, false);
187				query.reference = conversation.getFirstMamReference();
188			} else {
189				if (allowCatchup) {
190					MamReference maxCatchup = MamReference.max(startActual, System.currentTimeMillis() - Config.MAM_MAX_CATCHUP);
191					if (maxCatchup.greaterThan(startActual)) {
192						Query reverseCatchup = new Query(conversation, startActual, maxCatchup.getTimestamp(), false);
193						this.queries.add(reverseCatchup);
194						this.execute(reverseCatchup);
195					}
196					query = new Query(conversation, maxCatchup, end, true);
197				} else {
198					query = new Query(conversation, startActual, end, false);
199				}
200			}
201			if (end != 0 && start.greaterThan(end)) {
202				return null;
203			}
204			this.queries.add(query);
205			this.execute(query);
206			return query;
207		}
208	}
209
210	void executePendingQueries(final Account account) {
211		List<Query> pending = new ArrayList<>();
212		synchronized (this.pendingQueries) {
213			for (Iterator<Query> iterator = this.pendingQueries.iterator(); iterator.hasNext(); ) {
214				Query query = iterator.next();
215				if (query.getAccount() == account) {
216					pending.add(query);
217					iterator.remove();
218				}
219			}
220		}
221		for (Query query : pending) {
222			this.execute(query);
223		}
224	}
225
226	private void execute(final Query query) {
227		final Account account = query.getAccount();
228		if (account.getStatus() == Account.State.ONLINE) {
229			Log.d(Config.LOGTAG, account.getJid().asBareJid().toString() + ": running mam query " + query.toString());
230			IqPacket packet = this.mXmppConnectionService.getIqGenerator().queryMessageArchiveManagement(query);
231			this.mXmppConnectionService.sendIqPacket(account, packet, (a, p) -> {
232				Element fin = p.findChild("fin", query.version.namespace);
233				if (p.getType() == IqPacket.TYPE.TIMEOUT) {
234					synchronized (MessageArchiveService.this.queries) {
235						MessageArchiveService.this.queries.remove(query);
236						if (query.hasCallback()) {
237							query.callback(false);
238						}
239					}
240				} else if (p.getType() == IqPacket.TYPE.RESULT && fin != null) {
241					processFin(query, fin);
242				} else if (p.getType() == IqPacket.TYPE.RESULT && query.isLegacy()) {
243					//do nothing
244				} else {
245					Log.d(Config.LOGTAG, a.getJid().asBareJid().toString() + ": error executing mam: " + p.toString());
246					finalizeQuery(query, true);
247				}
248			});
249		} else {
250			synchronized (this.pendingQueries) {
251				this.pendingQueries.add(query);
252			}
253		}
254	}
255
256	private void finalizeQuery(Query query, boolean done) {
257		synchronized (this.queries) {
258			this.queries.remove(query);
259		}
260		final Conversation conversation = query.getConversation();
261		if (conversation != null) {
262			conversation.sort();
263			conversation.setHasMessagesLeftOnServer(!done);
264		} else {
265			for (Conversation tmp : this.mXmppConnectionService.getConversations()) {
266				if (tmp.getAccount() == query.getAccount()) {
267					tmp.sort();
268				}
269			}
270		}
271		if (query.hasCallback()) {
272			query.callback(done);
273		} else {
274			this.mXmppConnectionService.updateConversationUi();
275		}
276	}
277
278	boolean inCatchup(Account account) {
279		synchronized (this.queries) {
280			for (Query query : queries) {
281				if (query.account == account && query.isCatchup() && query.getWith() == null) {
282					return true;
283				}
284			}
285		}
286		return false;
287	}
288
289	public boolean isCatchupInProgress(Conversation conversation) {
290		synchronized (this.queries) {
291			for(Query query : queries) {
292				if (query.account == conversation.getAccount() && query.isCatchup()) {
293					final Jid with = query.getWith() == null ? null : query.getWith().asBareJid();
294					if ((conversation.getMode() == Conversational.MODE_SINGLE && with == null) || (conversation.getJid().asBareJid().equals(with))) {
295						return true;
296					}
297				}
298			}
299		}
300		return false;
301	}
302
303	boolean queryInProgress(Conversation conversation, XmppConnectionService.OnMoreMessagesLoaded callback) {
304		synchronized (this.queries) {
305			for (Query query : queries) {
306				if (query.conversation == conversation) {
307					if (!query.hasCallback() && callback != null) {
308						query.setCallback(callback);
309					}
310					return true;
311				}
312			}
313			return false;
314		}
315	}
316
317	public boolean queryInProgress(Conversation conversation) {
318		return queryInProgress(conversation, null);
319	}
320
321	public void processFinLegacy(Element fin, Jid from) {
322		Query query = findQuery(fin.getAttribute("queryid"));
323		if (query != null && query.validFrom(from)) {
324			processFin(query, fin);
325		}
326	}
327
328	private void processFin(Query query, Element fin) {
329		boolean complete = fin.getAttributeAsBoolean("complete");
330		Element set = fin.findChild("set", "http://jabber.org/protocol/rsm");
331		Element last = set == null ? null : set.findChild("last");
332		String count = set == null ? null : set.findChildContent("count");
333		Element first = set == null ? null : set.findChild("first");
334		Element relevant = query.getPagingOrder() == PagingOrder.NORMAL ? last : first;
335		boolean abort = (!query.isCatchup() && query.getTotalCount() >= Config.PAGE_SIZE) || query.getTotalCount() >= Config.MAM_MAX_MESSAGES;
336		if (query.getConversation() != null) {
337			query.getConversation().setFirstMamReference(first == null ? null : first.getContent());
338		}
339		if (complete || relevant == null || abort) {
340			boolean done;
341			if (query.isCatchup()) {
342				done = false;
343			} else {
344				if (count != null) {
345					try {
346						done = Integer.parseInt(count) <= query.getTotalCount();
347					} catch (NumberFormatException e) {
348						done = false;
349					}
350				} else {
351					done = query.getTotalCount() == 0;
352				}
353			}
354			done = done || (query.getActualMessageCount() == 0 && !query.isCatchup());
355			this.finalizeQuery(query, done);
356
357			Log.d(Config.LOGTAG, query.getAccount().getJid().asBareJid() + ": finished mam after " + query.getTotalCount() + "(" + query.getActualMessageCount() + ") messages. messages left=" + Boolean.toString(!done) + " count=" + count);
358			if (query.isCatchup() && query.getActualMessageCount() > 0) {
359				mXmppConnectionService.getNotificationService().finishBacklog(true, query.getAccount());
360			}
361			processPostponed(query);
362		} else {
363			final Query nextQuery;
364			if (query.getPagingOrder() == PagingOrder.NORMAL) {
365				nextQuery = query.next(last == null ? null : last.getContent());
366			} else {
367				nextQuery = query.prev(first == null ? null : first.getContent());
368			}
369			this.execute(nextQuery);
370			this.finalizeQuery(query, false);
371			synchronized (this.queries) {
372				this.queries.add(nextQuery);
373			}
374		}
375	}
376
377	void kill(Conversation conversation) {
378		final ArrayList<Query> toBeKilled = new ArrayList<>();
379		synchronized (this.queries) {
380			for (Query q : queries) {
381				if (q.conversation == conversation) {
382					toBeKilled.add(q);
383				}
384			}
385		}
386		for (Query q : toBeKilled) {
387			kill(q);
388		}
389	}
390
391	private void kill(Query query) {
392		Log.d(Config.LOGTAG, query.getAccount().getJid().asBareJid() + ": killing mam query prematurely");
393		query.callback = null;
394		this.finalizeQuery(query, false);
395		if (query.isCatchup() && query.getActualMessageCount() > 0) {
396			mXmppConnectionService.getNotificationService().finishBacklog(true, query.getAccount());
397		}
398		this.processPostponed(query);
399	}
400
401	private void processPostponed(Query query) {
402		query.account.getAxolotlService().processPostponed();
403		query.pendingReceiptRequests.removeAll(query.receiptRequests);
404		Log.d(Config.LOGTAG, query.getAccount().getJid().asBareJid() + ": found " + query.pendingReceiptRequests.size() + " pending receipt requests");
405		Iterator<ReceiptRequest> iterator = query.pendingReceiptRequests.iterator();
406		while (iterator.hasNext()) {
407			ReceiptRequest rr = iterator.next();
408			mXmppConnectionService.sendMessagePacket(query.account, mXmppConnectionService.getMessageGenerator().received(query.account, rr.getJid(), rr.getId()));
409			iterator.remove();
410		}
411	}
412
413	public Query findQuery(String id) {
414		if (id == null) {
415			return null;
416		}
417		synchronized (this.queries) {
418			for (Query query : this.queries) {
419				if (query.getQueryId().equals(id)) {
420					return query;
421				}
422			}
423			return null;
424		}
425	}
426
427	@Override
428	public void onAdvancedStreamFeaturesAvailable(Account account) {
429		if (account.getXmppConnection() != null && account.getXmppConnection().getFeatures().mam()) {
430			this.catchup(account);
431		}
432	}
433
434	public enum PagingOrder {
435		NORMAL,
436		REVERSE
437	}
438
439	public class Query {
440		private HashSet<ReceiptRequest> pendingReceiptRequests = new HashSet<>();
441		private HashSet<ReceiptRequest> receiptRequests = new HashSet<>();
442		private int totalCount = 0;
443		private int actualCount = 0;
444		private int actualInThisQuery = 0;
445		private long start;
446		private long end;
447		private String queryId;
448		private String reference = null;
449		private Account account;
450		private Conversation conversation;
451		private PagingOrder pagingOrder = PagingOrder.NORMAL;
452		private XmppConnectionService.OnMoreMessagesLoaded callback = null;
453		private boolean catchup = true;
454		public final Version version;
455
456
457		Query(Conversation conversation, MamReference start, long end, boolean catchup) {
458			this(conversation.getAccount(), Version.get(conversation.getAccount(), conversation), catchup ? start : start.timeOnly(), end);
459			this.conversation = conversation;
460			this.pagingOrder = catchup ? PagingOrder.NORMAL : PagingOrder.REVERSE;
461			this.catchup = catchup;
462		}
463
464		Query(Account account, MamReference start, long end) {
465			this(account, Version.get(account), start, end);
466		}
467
468		Query(Account account, Version version, MamReference start, long end) {
469			this.account = account;
470			if (start.getReference() != null) {
471				this.reference = start.getReference();
472			} else {
473				this.start = start.getTimestamp();
474			}
475			this.end = end;
476			this.queryId = new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
477			this.version = version;
478		}
479
480		private Query page(String reference) {
481			Query query = new Query(this.account, this.version, new MamReference(this.start, reference), this.end);
482			query.conversation = conversation;
483			query.totalCount = totalCount;
484			query.actualCount = actualCount;
485			query.pendingReceiptRequests = pendingReceiptRequests;
486			query.receiptRequests = receiptRequests;
487			query.callback = callback;
488			query.catchup = catchup;
489			return query;
490		}
491
492		public void removePendingReceiptRequest(ReceiptRequest receiptRequest) {
493			if (!this.pendingReceiptRequests.remove(receiptRequest)) {
494				this.receiptRequests.add(receiptRequest);
495			}
496		}
497
498		public void addPendingReceiptRequest(ReceiptRequest receiptRequest) {
499			this.pendingReceiptRequests.add(receiptRequest);
500		}
501
502		public boolean isLegacy() {
503			return version.legacy;
504		}
505
506		public boolean safeToExtractTrueCounterpart() {
507			return muc() && !isLegacy();
508		}
509
510		public Query next(String reference) {
511			Query query = page(reference);
512			query.pagingOrder = PagingOrder.NORMAL;
513			return query;
514		}
515
516		Query prev(String reference) {
517			Query query = page(reference);
518			query.pagingOrder = PagingOrder.REVERSE;
519			return query;
520		}
521
522		public String getReference() {
523			return reference;
524		}
525
526		public PagingOrder getPagingOrder() {
527			return this.pagingOrder;
528		}
529
530		public String getQueryId() {
531			return queryId;
532		}
533
534		public Jid getWith() {
535			return conversation == null ? null : conversation.getJid().asBareJid();
536		}
537
538		public boolean muc() {
539			return conversation != null && conversation.getMode() == Conversation.MODE_MULTI;
540		}
541
542		public long getStart() {
543			return start;
544		}
545
546		public boolean isCatchup() {
547			return catchup;
548		}
549
550		public void setCallback(XmppConnectionService.OnMoreMessagesLoaded callback) {
551			this.callback = callback;
552		}
553
554		public void callback(boolean done) {
555			if (this.callback != null) {
556				this.callback.onMoreMessagesLoaded(actualCount, conversation);
557				if (done) {
558					this.callback.informUser(R.string.no_more_history_on_server);
559				}
560			}
561		}
562
563		public long getEnd() {
564			return end;
565		}
566
567		public Conversation getConversation() {
568			return conversation;
569		}
570
571		public Account getAccount() {
572			return this.account;
573		}
574
575		public void incrementMessageCount() {
576			this.totalCount++;
577		}
578
579		public void incrementActualMessageCount() {
580			this.actualInThisQuery++;
581			this.actualCount++;
582		}
583
584		int getTotalCount() {
585			return this.totalCount;
586		}
587
588		int getActualMessageCount() {
589			return this.actualCount;
590		}
591
592		public int getActualInThisQuery() {
593			return this.actualInThisQuery;
594		}
595
596		public boolean validFrom(Jid from) {
597			if (muc()) {
598				return getWith().equals(from);
599			} else {
600				return (from == null) || account.getJid().asBareJid().equals(from.asBareJid());
601			}
602		}
603
604		@Override
605		public String toString() {
606			StringBuilder builder = new StringBuilder();
607			if (this.muc()) {
608				builder.append("to=");
609				builder.append(this.getWith().toString());
610			} else {
611				builder.append("with=");
612				if (this.getWith() == null) {
613					builder.append("*");
614				} else {
615					builder.append(getWith().toString());
616				}
617			}
618			if (this.start != 0) {
619				builder.append(", start=");
620				builder.append(AbstractGenerator.getTimestamp(this.start));
621			}
622			if (this.end != 0) {
623				builder.append(", end=");
624				builder.append(AbstractGenerator.getTimestamp(this.end));
625			}
626			builder.append(", order=").append(pagingOrder.toString());
627			if (this.reference != null) {
628				if (this.pagingOrder == PagingOrder.NORMAL) {
629					builder.append(", after=");
630				} else {
631					builder.append(", before=");
632				}
633				builder.append(this.reference);
634			}
635			builder.append(", catchup=").append(Boolean.toString(catchup));
636			builder.append(", ns=").append(version.namespace);
637			return builder.toString();
638		}
639
640		boolean hasCallback() {
641			return this.callback != null;
642		}
643	}
644}