summaryrefslogtreecommitdiff
path: root/src/xmpp/xmpp_component.cpp
blob: 3c2aa7a6a9e57e36ad2a8a9af3dedb6a7929e03a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
#include <utils/scopeguard.hpp>
#include <logger/logger.hpp>

#include <xmpp/xmpp_component.hpp>
#include <xmpp/jid.hpp>

#include <utils/sha1.hpp>

#include <stdexcept>
#include <iostream>

#include <stdio.h>

#include <config.h>

#ifdef SYSTEMDDAEMON_FOUND
# include <systemd/sd-daemon.h>
#endif

#define STREAM_NS        "http://etherx.jabber.org/streams"
#define COMPONENT_NS     "jabber:component:accept"
#define MUC_NS           "http://jabber.org/protocol/muc"
#define MUC_USER_NS      MUC_NS"#user"
#define MUC_ADMIN_NS     MUC_NS"#admin"
#define DISCO_NS         "http://jabber.org/protocol/disco"
#define DISCO_ITEMS_NS   DISCO_NS"#items"
#define DISCO_INFO_NS    DISCO_NS"#info"
#define XHTMLIM_NS       "http://jabber.org/protocol/xhtml-im"
#define STANZA_NS        "urn:ietf:params:xml:ns:xmpp-stanzas"
#define STREAMS_NS       "urn:ietf:params:xml:ns:xmpp-streams"
#define VERSION_NS       "jabber:iq:version"

using namespace std::string_literals;

unsigned long XmppComponent::current_id = 0;

static std::set<std::string> kickable_errors{
    "gone",
    "internal-server-error",
    "item-not-found",
    "jid-malformed",
    "recipient-unavailable",
    "redirect",
    "remote-server-not-found",
    "remote-server-timeout",
    "service-unavailable",
    "malformed-error"
    };

XmppComponent::XmppComponent(std::shared_ptr<Poller> poller, const std::string& hostname, const std::string& secret):
  SocketHandler(poller),
  ever_auth(false),
  last_auth(false),
  served_hostname(hostname),
  secret(secret),
  authenticated(false),
  doc_open(false)
{
  this->parser.add_stream_open_callback(std::bind(&XmppComponent::on_remote_stream_open, this,
                                                  std::placeholders::_1));
  this->parser.add_stanza_callback(std::bind(&XmppComponent::on_stanza, this,
                                                  std::placeholders::_1));
  this->parser.add_stream_close_callback(std::bind(&XmppComponent::on_remote_stream_close, this,
                                                  std::placeholders::_1));
  this->stanza_handlers.emplace("handshake",
                                std::bind(&XmppComponent::handle_handshake, this,std::placeholders::_1));
  this->stanza_handlers.emplace("presence",
                                std::bind(&XmppComponent::handle_presence, this,std::placeholders::_1));
  this->stanza_handlers.emplace("message",
                                std::bind(&XmppComponent::handle_message, this,std::placeholders::_1));
  this->stanza_handlers.emplace("iq",
                                std::bind(&XmppComponent::handle_iq, this,std::placeholders::_1));
  this->stanza_handlers.emplace("error",
                                std::bind(&XmppComponent::handle_error, this,std::placeholders::_1));
}

XmppComponent::~XmppComponent()
{
}

void XmppComponent::start()
{
  this->connect("127.0.0.1", "5347");
}

bool XmppComponent::is_document_open() const
{
  return this->doc_open;
}

void XmppComponent::send_stanza(const Stanza& stanza)
{
  std::string str = stanza.to_string();
  log_debug("XMPP SENDING: " << str);
  this->send_data(std::move(str));
}

void XmppComponent::on_connection_failed(const std::string& reason)
{
  log_error("Failed to connect to the XMPP server: " << reason);
#ifdef SYSTEMDDAEMON_FOUND
  sd_notifyf(0, "STATUS=Failed to connect to the XMPP server: %s", reason.data());
#endif
}

void XmppComponent::on_connected()
{
  log_info("connected to XMPP server");
  XmlNode node("stream:stream", nullptr);
  node["xmlns"] = COMPONENT_NS;
  node["xmlns:stream"] = STREAM_NS;
  node["to"] = this->served_hostname;
  this->send_stanza(node);
  this->doc_open = true;
  // We may have some pending data to send: this happens when we try to send
  // some data before we are actually connected.  We send that data right now, if any
  this->send_pending_data();
}

void XmppComponent::on_connection_close()
{
  log_info("XMPP server closed connection");
}

void XmppComponent::parse_in_buffer(const size_t size)
{
  if (!this->in_buf.empty())
    { // This may happen if the parser could not allocate enough space for
      // us. We try to feed it the data that was read into our in_buf
      // instead. If this fails again we are in trouble.
      this->parser.feed(this->in_buf.data(), this->in_buf.size(), false);
      this->in_buf.clear();
    }
  else
    { // Just tell the parser to parse the data that was placed into the
      // buffer it provided to us with GetBuffer
      this->parser.parse(size, false);
    }
}

void XmppComponent::shutdown()
{
  for (auto it = this->bridges.begin(); it != this->bridges.end(); ++it)
  {
    it->second->shutdown("Gateway shutdown");
  }
}

void XmppComponent::clean()
{
  auto it = this->bridges.begin();
  while (it != this->bridges.end())
  {
    it->second->clean();
    if (it->second->active_clients() == 0)
      it = this->bridges.erase(it);
    else
      ++it;
  }
}

void XmppComponent::on_remote_stream_open(const XmlNode& node)
{
  log_debug("XMPP DOCUMENT OPEN: " << node.to_string());
  this->stream_id = node.get_tag("id");
  if (this->stream_id.empty())
    {
      log_error("Error: no attribute 'id' found");
      this->send_stream_error("bad-format", "missing 'id' attribute");
      this->close_document();
      return ;
    }

  this->last_auth = false;
  // Try to authenticate
  char digest[HASH_LENGTH * 2 + 1];
  sha1nfo sha1;
  sha1_init(&sha1);
  sha1_write(&sha1, this->stream_id.data(), this->stream_id.size());
  sha1_write(&sha1, this->secret.data(),  this->secret.size());
  const uint8_t* result = sha1_result(&sha1);
  for (int i=0; i < HASH_LENGTH; i++)
    sprintf(digest + (i*2), "%02x", result[i]);
  digest[HASH_LENGTH * 2] = '\0';

  Stanza handshake("handshake");
  handshake.set_inner(digest);
  handshake.close();
  this->send_stanza(handshake);
}

void XmppComponent::on_remote_stream_close(const XmlNode& node)
{
  log_debug("XMPP DOCUMENT CLOSE " << node.to_string());
  this->doc_open = false;
}

void XmppComponent::reset()
{
  this->parser.reset();
}

void XmppComponent::on_stanza(const Stanza& stanza)
{
  log_debug("XMPP RECEIVING: " << stanza.to_string());
  std::function<void(const Stanza&)> handler;
  try
    {
      handler = this->stanza_handlers.at(stanza.get_name());
    }
  catch (const std::out_of_range& exception)
    {
      log_warning("No handler for stanza of type " << stanza.get_name());
      return;
    }
  handler(stanza);
}

void XmppComponent::send_stream_error(const std::string& name, const std::string& explanation)
{
  XmlNode node("stream:error", nullptr);
  XmlNode error(name, nullptr);
  error["xmlns"] = STREAM_NS;
  if (!explanation.empty())
    error.set_inner(explanation);
  error.close();
  node.add_child(std::move(error));
  node.close();
  this->send_stanza(node);
}

void XmppComponent::send_stanza_error(const std::string& kind, const std::string& to, const std::string& from,
                       const std::string& id, const std::string& error_type,
                       const std::string& defined_condition, const std::string& text)
{
  Stanza node(kind);
  if (!to.empty())
    node["to"] = to;
  if (!from.empty())
    node["from"] = from;
  if (!id.empty())
    node["id"] = id;
  node["type"] = "error";
  XmlNode error("error");
  error["type"] = error_type;
  XmlNode inner_error(defined_condition);
  inner_error["xmlns"] = STANZA_NS;
  inner_error.close();
  error.add_child(std::move(inner_error));
  if (!text.empty())
    {
      XmlNode text_node("text");
      text_node["xmlns"] = STANZA_NS;
      text_node.set_inner(text);
      text_node.close();
      error.add_child(std::move(text_node));
    }
  error.close();
  node.add_child(std::move(error));
  node.close();
  this->send_stanza(node);
}

void XmppComponent::close_document()
{
  log_debug("XMPP SENDING: </stream:stream>");
  this->send_data("</stream:stream>");
  this->doc_open = false;
}

void XmppComponent::handle_handshake(const Stanza& stanza)
{
  (void)stanza;
  this->authenticated = true;
  this->ever_auth = true;
  this->last_auth = true;
  log_info("Authenticated with the XMPP server");
#ifdef SYSTEMDDAEMON_FOUND
  sd_notify(0, "READY=1");
#endif
}

void XmppComponent::handle_presence(const Stanza& stanza)
{
  std::string from = stanza.get_tag("from");
  std::string id = stanza.get_tag("id");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  // Check for mandatory tags
  if (from.empty())
    {
      log_warning("Received an invalid presence stanza: tag 'from' is missing.");
      return;
    }
  if (to_str.empty())
    {
      this->send_stanza_error("presence", from, this->served_hostname, id,
                              "modify", "bad-request", "Missing 'to' tag");
      return;
    }

  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);
  Iid iid(to.local);

  // An error stanza is sent whenever we exit this function without
  // disabling this scopeguard.  If error_type and error_name are not
  // changed, the error signaled is internal-server-error. Change their
  // value to signal an other kind of error. For example
  // feature-not-implemented, etc.  Any non-error process should reach the
  // stanza_error.disable() call at the end of the function.
  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("presence", from, to_str, id,
                              error_type, error_name, "");
        });

  if (!iid.server.empty())
    { // presence toward a MUC that corresponds to an irc channel, or a
      // dummy channel if iid.chan is empty
      if (type.empty())
        {
          const std::string own_nick = bridge->get_own_nick(iid);
          if (!own_nick.empty() && own_nick != to.resource)
            bridge->send_irc_nick_change(iid, to.resource);
          bridge->join_irc_channel(iid, to.resource);
        }
      else if (type == "unavailable")
        {
          XmlNode* status = stanza.get_child(COMPONENT_NS":status");
          bridge->leave_irc_channel(std::move(iid), status ? std::move(status->get_inner()) : "");
        }
    }
  else
    {
      // An user wants to join an invalid IRC channel, return a presence error to him
      if (type.empty())
        this->send_invalid_room_error(to.local, to.resource, from);
    }
  stanza_error.disable();
}

void XmppComponent::handle_message(const Stanza& stanza)
{
  std::string from = stanza.get_tag("from");
  std::string id = stanza.get_tag("id");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  if (from.empty())
    return;
  if (type.empty())
    type = "normal";
  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);
  Iid iid(to.local);

  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("message", from, to_str, id,
                              error_type, error_name, "");
        });
  XmlNode* body = stanza.get_child(COMPONENT_NS":body");
  if (type == "groupchat")
    {
      if (to.resource.empty())
        if (body && !body->get_inner().empty())
          bridge->send_channel_message(iid, body->get_inner());
      XmlNode* subject = stanza.get_child(COMPONENT_NS":subject");
      if (subject)
        bridge->set_channel_topic(iid, subject->get_inner());
    }
  else if (type == "error")
    {
      const XmlNode* error = stanza.get_child(COMPONENT_NS":error");
      // Only a set of errors are considered “fatal”. If we encounter one of
      // them, we purge (we disconnect the user from all the IRC servers).
      // We consider this to be true, unless the error condition is
      // specified and is not in the kickable_errors set
      bool kickable_error = true;
      if (error && error->has_children())
        {
          const XmlNode* condition = error->get_last_child();
          if (kickable_errors.find(condition->get_name()) == kickable_errors.end())
              kickable_error = false;
        }
      if (kickable_error)
        bridge->shutdown("Error from remote client");
    }
  else if (type == "chat")
    {
      if (body && !body->get_inner().empty())
        bridge->send_private_message(iid, body->get_inner());
    }
  stanza_error.disable();
}

// We MUST return an iq, whatever happens, except if the type is
// "result".
// To do this, we use a scopeguard. If an exception is raised somewhere, an
// iq of type error "internal-server-error" is sent. If we handle the
// request properly (by calling a function that registers an iq to be sent
// later, or that directly sends an iq), we disable the ScopeGuard. If we
// reach the end of the function without having disabled the scopeguard, we
// send a "feature-not-implemented" iq as a result.  If an other kind of
// error is found (for example the feature is implemented in biboumi, but
// the request is missing some attribute) we can just change the values of
// error_type and error_name and return from the function (without disabling
// the scopeguard); an iq error will be sent
void XmppComponent::handle_iq(const Stanza& stanza)
{
  std::string id = stanza.get_tag("id");
  std::string from = stanza.get_tag("from");
  std::string to_str = stanza.get_tag("to");
  std::string type = stanza.get_tag("type");

  if (from.empty())
    return;
  if (id.empty() || to_str.empty() || type.empty())
    {
      this->send_stanza_error("iq", from, this->served_hostname, id,
                              "modify", "bad-request", "");
      return;
    }

  Bridge* bridge = this->get_user_bridge(from);
  Jid to(to_str);

  // These two values will be used in the error iq sent if we don't disable
  // the scopeguard.
  std::string error_type("cancel");
  std::string error_name("internal-server-error");
  utils::ScopeGuard stanza_error([&](){
      this->send_stanza_error("iq", from, to_str, id,
                              error_type, error_name, "");
        });
  if (type == "set")
    {
      XmlNode* query;
      if ((query = stanza.get_child(MUC_ADMIN_NS":query")))
        {
          const XmlNode* child = query->get_child(MUC_ADMIN_NS":item");
          if (child)
            {
              std::string nick = child->get_tag("nick");
              std::string role = child->get_tag("role");
              if (!nick.empty() && role == "none")
                {               // This is a kick
                  std::string reason;
                  XmlNode* reason_el = child->get_child(MUC_ADMIN_NS":reason");
                  if (reason_el)
                    reason = reason_el->get_inner();
                  Iid iid(to.local);
                  bridge->send_irc_kick(iid, nick, reason);
                  stanza_error.disable();
                }
            }
        }
    }
  else if (type == "get")
    {
      XmlNode* query;
      if ((query = stanza.get_child(DISCO_INFO_NS":query")))
        { // Disco info
          if (to_str == this->served_hostname)
            { // On the gateway itself
              this->send_self_disco_info(id, from);
              stanza_error.disable();
            }
        }
    }
  else if (type == "result")
    {
      stanza_error.disable();
      XmlNode* query;
      if ((query = stanza.get_child(VERSION_NS":query")))
        {
          XmlNode* name_node = query->get_child(VERSION_NS":name");
          XmlNode* version_node = query->get_child(VERSION_NS":version");
          XmlNode* os_node = query->get_child(VERSION_NS":os");
          std::string name;
          std::string version;
          std::string os;
          if (name_node)
            name = name_node->get_inner() + " (through the biboumi gateway)";
          if (version_node)
            version = version_node->get_inner();
          if (os_node)
            os = os_node->get_inner();
          const Iid iid(to.local);
          bridge->send_xmpp_version_to_irc(iid, name, version, os);
        }
    }
  error_type = "cancel";
  error_name = "feature-not-implemented";
}

void XmppComponent::handle_error(const Stanza& stanza)
{
  XmlNode* text = stanza.get_child(STREAMS_NS":text");
  std::string error_message("Unspecified error");
  if (text)
    error_message = text->get_inner();
  log_error("Stream error received from the XMPP server: " << error_message);
#ifdef SYSTEMDDAEMON_FOUND
  if (!this->ever_auth)
    sd_notifyf(0, "STATUS=Failed to authenticate to the XMPP server: %s", error_message.data());
#endif

}

Bridge* XmppComponent::get_user_bridge(const std::string& user_jid)
{
  try
    {
      return this->bridges.at(user_jid).get();
    }
  catch (const std::out_of_range& exception)
    {
      this->bridges.emplace(user_jid, std::make_unique<Bridge>(user_jid, this, this->poller));
      return this->bridges.at(user_jid).get();
    }
}

void* XmppComponent::get_receive_buffer(const size_t size) const
{
  return this->parser.get_buffer(size);
}

void XmppComponent::send_message(const std::string& from, Xmpp::body&& body, const std::string& to, const std::string& type)
{
  XmlNode node("message");
  node["to"] = to;
  node["from"] = from + "@" + this->served_hostname;
  if (!type.empty())
    node["type"] = type;
  XmlNode body_node("body");
  body_node.set_inner(std::get<0>(body));
  body_node.close();
  node.add_child(std::move(body_node));
  if (std::get<1>(body))
    {
      XmlNode html("html");
      html["xmlns"] = XHTMLIM_NS;
      // Pass the ownership of the pointer to this xmlnode
      html.add_child(std::get<1>(body).release());
      html.close();
      node.add_child(std::move(html));
    }
  node.close();
  this->send_stanza(node);
}

void XmppComponent::send_user_join(const std::string& from,
                                   const std::string& nick,
                                   const std::string& realjid,
                                   const std::string& affiliation,
                                   const std::string& role,
                                   const std::string& to,
                                   const bool self)
{
  XmlNode node("presence");
  node["to"] = to;
  node["from"] = from + "@" + this->served_hostname + "/" + nick;

  XmlNode x("x");
  x["xmlns"] = MUC_USER_NS;

  XmlNode item("item");
  if (!affiliation.empty())
    item["affiliation"] = affiliation;
  if (!role.empty())
    item["role"] = role;
  if (!realjid.empty())
    {
      const std::string preped_jid = jidprep(realjid);
      if (!preped_jid.empty())
        item["jid"] = preped_jid;
    }
  item.close();
  x.add_child(std::move(item));

  if (self)
    {
      XmlNode status("status");
      status["code"] = "110";
      status.close();
      x.add_child(std::move(status));
    }
  x.close();
  node.add_child(std::move(x));
  node.close();
  this->send_stanza(node);
}

void XmppComponent::send_invalid_room_error(const std::string& muc_name,
                                            const std::string& nick,
                                            const std::string& to)
{
  Stanza presence("presence");
  presence["from"] = muc_name + "@" + this->served_hostname + "/" + nick;
  presence["to"] = to;
  presence["type"] = "error";
  XmlNode x("x");
  x["xmlns"] = MUC_NS;
  x.close();
  presence.add_child(std::move(x));
  XmlNode error("error");
  error["by"] = muc_name + "@" + this->served_hostname;
  error["type"] = "cancel";
  XmlNode item_not_found("item-not-found");
  item_not_found["xmlns"] = STANZA_NS;
  item_not_found.close();
  error.add_child(std::move(item_not_found));
  XmlNode text("text");
  text["xmlns"] = STANZA_NS;
  text["xml:lang"] = "en";
  text.set_inner(muc_name +
                 " is not a valid IRC channel name. A correct room jid is of the form: #<chan>%<server>@" +
                 this->served_hostname);
  text.close();
  error.add_child(std::move(text));
  error.close();
  presence.add_child(std::move(error));
  presence.close();
  this->send_stanza(presence);
}

void XmppComponent::send_topic(const std::string& from, Xmpp::body&& topic, const std::string& to)
{
  XmlNode message("message");
  message["to"] = to;
  message["from"] = from + "@" + this->served_hostname;
  message["type"] = "groupchat";
  XmlNode subject("subject");
  subject.set_inner(std::get<0>(topic));
  subject.close();
  message.add_child(std::move(subject));
  message.close();
  this->send_stanza(message);
}

void XmppComponent::send_muc_message(const std::string& muc_name, const std::string& nick, Xmpp::body&& xmpp_body, const std::string& jid_to)
{
  Stanza message("message");
  message["to"] = jid_to;
  if (!nick.empty())
    message["from"] = muc_name + "@" + this->served_hostname + "/" + nick;
  else // Message from the room itself
    message["from"] = muc_name + "@" + this->served_hostname;
  message["type"] = "groupchat";
  XmlNode body("body");
  body.set_inner(std::get<0>(xmpp_body));
  body.close();
  message.add_child(std::move(body));
  if (std::get<1>(xmpp_body))
    {
      XmlNode html("html");
      html["xmlns"] = XHTMLIM_NS;
      // Pass the ownership of the pointer to this xmlnode
      html.add_child(std::get<1>(xmpp_body).release());
      html.close();
      message.add_child(std::move(html));
    }
  message.close();
  this->send_stanza(message);
}

void XmppComponent::send_muc_leave(std::string&& muc_name, std::string&& nick, Xmpp::body&& message, const std::string& jid_to, const bool self)
{
  Stanza presence("presence");
  presence["to"] = jid_to;
  presence["from"] = muc_name + "@" + this->served_hostname + "/" + nick;
  presence["type"] = "unavailable";
  const std::string message_str = std::get<0>(message);
  XmlNode x("x");
  x["xmlns"] = MUC_USER_NS;
  if (self)
    {
      XmlNode status("status");
      status["code"] = "110";
      status.close();
      x.add_child(std::move(status));
    }
  x.close();
  presence.add_child(std::move(x));
  if (!message_str.empty())
    {
      XmlNode status("status");
      status.set_inner(message_str);
      status.close();
      presence.add_child(std::move(status));
    }
  presence.close();
  this->send_stanza(presence);
}

void XmppComponent::send_nick_change(const std::string& muc_name,
                                     const std::string& old_nick,
                                     const std::string& new_nick,
                                     const std::string& affiliation,
                                     const std::string& role,
                                     const std::string& jid_to,
                                     const bool self)
{
  Stanza presence("presence");
  presence["to"] = jid_to;
  presence["from"] = muc_name + "@" + this->served_hostname + "/" + old_nick;
  presence["type"] = "unavailable";
  XmlNode x("x");
  x["xmlns"] = MUC_USER_NS;
  XmlNode item("item");
  item["nick"] = new_nick;
  item.close();
  x.add_child(std::move(item));
  XmlNode status("status");
  status["code"] = "303";
  status.close();
  x.add_child(std::move(status));
  if (self)
    {
      XmlNode status2("status");
      status2["code"] = "110";
      status2.close();
      x.add_child(std::move(status2));
    }
  x.close();
  presence.add_child(std::move(x));
  presence.close();
  this->send_stanza(presence);

  this->send_user_join(muc_name, new_nick, "", affiliation, role, jid_to, self);
}

void XmppComponent::kick_user(const std::string& muc_name,
                                  const std::string& target,
                                  const std::string& txt,
                                  const std::string& author,
                                  const std::string& jid_to)
{
  Stanza presence("presence");
  presence["from"] = muc_name + "@" + this->served_hostname + "/" + target;
  presence["to"] = jid_to;
  presence["type"] = "unavailable";
  XmlNode x("x");
  x["xmlns"] = MUC_USER_NS;
  XmlNode item("item");
  item["affiliation"] = "none";
  item["role"] = "none";
  XmlNode actor("actor");
  actor["nick"] = author;
  actor["jid"] = author; // backward compatibility with old clients
  actor.close();
  item.add_child(std::move(actor));
  XmlNode reason("reason");
  reason.set_inner(txt);
  reason.close();
  item.add_child(std::move(reason));
  item.close();
  x.add_child(std::move(item));
  XmlNode status("status");
  status["code"] = "307";
  status.close();
  x.add_child(std::move(status));
  x.close();
  presence.add_child(std::move(x));
  presence.close();
  this->send_stanza(presence);
}

void XmppComponent::send_nickname_conflict_error(const std::string& muc_name,
                                                 const std::string& nickname,
                                                 const std::string& jid_to)
{
  Stanza presence("presence");
  presence["from"] = muc_name + "@" + this->served_hostname + "/" + nickname;
  presence["to"] = jid_to;
  XmlNode x("x");
  x["xmlns"] = MUC_NS;
  x.close();
  presence.add_child(std::move(x));
  XmlNode error("error");
  error["by"] = muc_name + "@" + this->served_hostname;
  error["type"] = "cancel";
  error["code"] = "409";
  XmlNode conflict("conflict");
  conflict["xmlns"] = STANZA_NS;
  conflict.close();
  error.add_child(std::move(conflict));
  error.close();
  presence.add_child(std::move(error));
  presence.close();
  this->send_stanza(presence);
}

void XmppComponent::send_presence_error(const std::string& muc_name,
                                   const std::string& nickname,
                                   const std::string& jid_to,
                                   const std::string& type,
                                   const std::string& condition,
                                   const std::string&)
{
  Stanza presence("presence");
  presence["from"] = muc_name + "@" + this->served_hostname + "/" + nickname;
  presence["to"] = jid_to;
  XmlNode x("x");
  x["xmlns"] = MUC_NS;
  x.close();
  presence.add_child(std::move(x));
  XmlNode error("error");
  error["by"] = muc_name + "@" + this->served_hostname;
  error["type"] = type;
  XmlNode subnode(condition);
  subnode["xmlns"] = STANZA_NS;
  subnode.close();
  error.add_child(std::move(subnode));
  error.close();
  presence.add_child(std::move(error));
  presence.close();
  this->send_stanza(presence);
}

void XmppComponent::send_affiliation_role_change(const std::string& muc_name,
                                                 const std::string& target,
                                                 const std::string& affiliation,
                                                 const std::string& role,
                                                 const std::string& jid_to)
{
  Stanza presence("presence");
  presence["from"] = muc_name + "@" + this->served_hostname + "/" + target;
  presence["to"] = jid_to;
  XmlNode x("x");
  x["xmlns"] = MUC_USER_NS;
  XmlNode item("item");
  item["affiliation"] = affiliation;
  item["role"] = role;
  item.close();
  x.add_child(std::move(item));
  x.close();
  presence.add_child(std::move(x));
  presence.close();
  this->send_stanza(presence);
}

void XmppComponent::send_self_disco_info(const std::string& id, const std::string& jid_to)
{
  Stanza iq("iq");
  iq["type"] = "result";
  iq["id"] = id;
  iq["to"] = jid_to;
  iq["from"] = this->served_hostname;
  XmlNode query("query");
  query["xmlns"] = DISCO_INFO_NS;
  XmlNode identity("identity");
  identity["category"] = "conference";
  identity["type"] = "irc";
  identity["name"] = "Biboumi XMPP-IRC gateway";
  identity.close();
  query.add_child(std::move(identity));
  for (const std::string& ns: {"http://jabber.org/protocol/disco#info",
                                    "http://jabber.org/protocol/muc"})
    {
      XmlNode feature("feature");
      feature["var"] = ns;
      feature.close();
      query.add_child(std::move(feature));
    }
  query.close();
  iq.add_child(std::move(query));
  iq.close();
  this->send_stanza(iq);
}

void XmppComponent::send_iq_version_request(const std::string& from,
                                            const std::string& jid_to)
{
  Stanza iq("iq");
  iq["type"] = "get";
  iq["id"] = "version_"s + XmppComponent::next_id();
  iq["from"] = from + "@" + this->served_hostname;
  iq["to"] = jid_to;
  XmlNode query("query");
  query["xmlns"] = VERSION_NS;
  query.close();
  iq.add_child(std::move(query));
  iq.close();
  this->send_stanza(iq);
}

std::string XmppComponent::next_id()
{
  return std::to_string(XmppComponent::current_id++);
}