summaryrefslogtreecommitdiff
path: root/src/bridge/bridge.cpp
blob: e312345805ec112159acf73771efa57e1eb8a2aa (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
#include <bridge/bridge.hpp>
#include <bridge/colors.hpp>
#include <xmpp/xmpp_component.hpp>
#include <xmpp/xmpp_stanza.hpp>
#include <irc/irc_message.hpp>
#include <network/poller.hpp>
#include <utils/empty_if_fixed_server.hpp>
#include <utils/encoding.hpp>
#include <utils/tolower.hpp>
#include <logger/logger.hpp>
#include <utils/revstr.hpp>
#include <utils/split.hpp>
#include <xmpp/jid.hpp>
#include <stdexcept>
#include <iostream>
#include <tuple>

using namespace std::string_literals;

static const char* action_prefix = "\01ACTION ";

Bridge::Bridge(const std::string& user_jid, XmppComponent* xmpp, std::shared_ptr<Poller> poller):
  user_jid(user_jid),
  xmpp(xmpp),
  poller(poller)
{
}

Bridge::~Bridge()
{
}

/**
 * Return the role and affiliation, corresponding to the given irc mode */
static std::tuple<std::string, std::string> get_role_affiliation_from_irc_mode(const char mode)
{
  if (mode == 'a' || mode == 'q')
    return std::make_tuple("moderator", "owner");
  else if (mode == 'o')
    return std::make_tuple("moderator", "admin");
  else if (mode == 'h')
    return std::make_tuple("moderator", "member");
  else if (mode == 'v')
    return std::make_tuple("participant", "member");
  else
    return std::make_tuple("participant", "none");
}

void Bridge::shutdown(const std::string& exit_message)
{
  for (auto it = this->irc_clients.begin(); it != this->irc_clients.end(); ++it)
  {
    it->second->send_quit_command(exit_message);
    it->second->leave_dummy_channel(exit_message);
  }
}

void Bridge::clean()
{
  auto it = this->irc_clients.begin();
  while (it != this->irc_clients.end())
  {
    IrcClient* client = it->second.get();
    if (!client->is_connected() && !client->is_connecting())
      it = this->irc_clients.erase(it);
    else
      ++it;
  }
}

const std::string& Bridge::get_jid() const
{
  return this->user_jid;
}

Xmpp::body Bridge::make_xmpp_body(const std::string& str)
{
  std::string res;
  if (utils::is_valid_utf8(str.c_str()))
    res = str;
  else
    res = utils::convert_to_utf8(str, "ISO-8859-1");
  return irc_format_to_xhtmlim(res);
}

IrcClient* Bridge::get_irc_client(const std::string& hostname, const std::string& username)
{
  try
    {
      return this->irc_clients.at(hostname).get();
    }
  catch (const std::out_of_range& exception)
    {
      this->irc_clients.emplace(hostname, std::make_shared<IrcClient>(this->poller, hostname, username, this));
      std::shared_ptr<IrcClient> irc = this->irc_clients.at(hostname);
      return irc.get();
    }
}

IrcClient* Bridge::get_irc_client(const std::string& hostname)
{
  try
    {
      return this->irc_clients.at(hostname).get();
    }
  catch (const std::out_of_range& exception)
    {
      return nullptr;
    }
}

bool Bridge::join_irc_channel(const Iid& iid, const std::string& username, const std::string& password)
{
  IrcClient* irc = this->get_irc_client(iid.get_server(), username);
  if (iid.get_local().empty())
    { // Join the dummy channel
      if (irc->is_welcomed())
        {
          if (irc->get_dummy_channel().joined)
            return false;
          // Immediately simulate a message coming from the IRC server saying that we
          // joined the channel
          const IrcMessage join_message(irc->get_nick(), "JOIN", {""});
          irc->on_channel_join(join_message);
          const IrcMessage end_join_message(std::string(iid.get_server()), "366",
                                            {irc->get_nick(),
                                                "", "End of NAMES list"});
          irc->on_channel_completely_joined(end_join_message);
        }
      else
        {
          irc->get_dummy_channel().joining = true;
          irc->start();
        }
      return true;
    }
  if (irc->is_channel_joined(iid.get_local()) == false)
    {
      irc->send_join_command(iid.get_local(), password);
      return true;
    }
  return false;
}

void Bridge::send_channel_message(const Iid& iid, const std::string& body)
{
  if (iid.get_local().empty() || iid.get_server().empty())
    {
      log_warning("Cannot send message to channel: [" << iid.get_local() << "] on server [" << iid.get_server() << "]");
      return;
    }
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (!irc)
    {
      log_warning("Cannot send message: no client exist for server " << iid.get_server());
      return;
    }
  // Because an IRC message cannot contain \n, we need to convert each line
  // of text into a separate IRC message. For conveniance, we also cut the
  // message into submessages on the XMPP side, this way the user of the
  // gateway sees what was actually sent over IRC.  For example if an user
  // sends “hello\n/me waves”, two messages will be generated: “hello” and
  // “/me waves”. Note that the “command” handling (messages starting with
  // /me, /mode, etc) is done for each message generated this way. In the
  // above example, the /me will be interpreted.
  std::vector<std::string> lines = utils::split(body, '\n', true);
  if (lines.empty())
    return ;
  for (const std::string& line: lines)
    {
      if (line.substr(0, 6) == "/mode ")
        {
          std::vector<std::string> args = utils::split(line.substr(6), ' ', false);
          irc->send_mode_command(iid.get_local(), args);
          continue;             // We do not want to send that back to the
                                // XMPP user, that’s not a textual message.
        }
      else if (line.substr(0, 4) == "/me ")
        irc->send_channel_message(iid.get_local(), action_prefix + line.substr(4) + "\01");
      else
        irc->send_channel_message(iid.get_local(), line);
      this->xmpp->send_muc_message(std::to_string(iid), irc->get_own_nick(),
                                   this->make_xmpp_body(line), this->user_jid);
    }
}

void Bridge::forward_affiliation_role_change(const Iid& iid, const std::string& nick,
                                             const std::string& affiliation,
                                             const std::string& role)
{
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (!irc)
    return;
  IrcChannel* chan = irc->get_channel(iid.get_local());
  if (!chan || !chan->joined)
    return;
  IrcUser* user = chan->find_user(nick);
  if (!user)
    return;
  // For each affiliation or role, we have a “maximal” mode that we want to
  // set. We must remove any superior mode at the same time. For example if
  // the user already has +o mode, and we set its affiliation to member, we
  // remove the +o mode, and add +v.  For each “superior” mode (for example,
  // for +v, the superior modes are 'h', 'a', 'o' and 'q') we check if that
  // user has it, and if yes we remove that mode

  std::size_t nb = 1;               // the number of times the nick must be
                                    // repeated in the argument list
  std::string modes;                // The string of modes to
                                    // add/remove. For example "+v-aoh"
  std::vector<char> modes_to_remove; // List of modes to check for removal
  if (affiliation == "none")
    {
      modes = "";
      nb = 0;
      modes_to_remove = {'v', 'h', 'o', 'a', 'q'};
    }
  else if (affiliation == "member")
    {
      modes = "+v";
      modes_to_remove = {'h', 'o', 'a', 'q'};
    }
  else if (role == "moderator")
    {
      modes = "+h";
      modes_to_remove = {'o', 'a', 'q'};
    }
  else if (affiliation == "admin")
    {
      modes = "+o";
      modes_to_remove = {'a', 'q'};
    }
  else if (affiliation == "owner")
    {
      modes = "+a";
      modes_to_remove = {'q'};
    }
  else
    return;
  for (const char mode: modes_to_remove)
    if (user->modes.find(mode) != user->modes.end())
      {
        modes += "-"s + mode;
        nb++;
      }
  if (modes.empty())
    return;
  std::vector<std::string> args(nb, nick);
  args.insert(args.begin(), modes);
  irc->send_mode_command(iid.get_local(), args);
}

void Bridge::send_private_message(const Iid& iid, const std::string& body, const std::string& type)
{
  if (iid.get_local().empty() || iid.get_server().empty())
    return ;
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (!irc)
    {
      log_warning("Cannot send message: no client exist for server " << iid.get_server());
      return;
    }
  std::vector<std::string> lines = utils::split(body, '\n', true);
  if (lines.empty())
    return ;
  for (const std::string& line: lines)
    {
      if (line.substr(0, 4) == "/me ")
        irc->send_private_message(iid.get_local(), action_prefix + line.substr(4) + "\01", type);
      else
        irc->send_private_message(iid.get_local(), line, type);
    }
}

void Bridge::leave_irc_channel(Iid&& iid, std::string&& status_message)
{
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (irc)
    irc->send_part_command(iid.get_local(), status_message);
}

void Bridge::send_irc_nick_change(const Iid& iid, const std::string& new_nick)
{
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (irc)
    irc->send_nick_command(new_nick);
}

void Bridge::send_irc_kick(const Iid& iid, const std::string& target, const std::string& reason,
                           const std::string& iq_id, const std::string& to_jid)
{
  IrcClient* irc = this->get_irc_client(iid.get_server());

  if (!irc)
    return;

  irc->send_kick_command(iid.get_local(), target, reason);
  irc_responder_callback_t cb = [this, target, iq_id, to_jid, iid](const std::string& irc_hostname,
                                                                   const IrcMessage& message) -> bool
    {
      if (irc_hostname != iid.get_server())
        return false;
      if (message.command == "KICK" && message.arguments.size() >= 2)
        {
          const std::string target_later = message.arguments[1];
          const std::string chan_name_later = utils::tolower(message.arguments[0]);
          if (target_later != target || chan_name_later != iid.get_local())
            return false;
          this->xmpp->send_iq_result(iq_id, to_jid, std::to_string(iid));
        }
      else if (message.command == "401" && message.arguments.size() >= 2)
        {
          const std::string target_later = message.arguments[1];
          if (target_later != target)
            return false;
          std::string error_message = "No such nick";
          if (message.arguments.size() >= 3)
            error_message = message.arguments[2];
          this->xmpp->send_stanza_error("iq", to_jid, std::to_string(iid), iq_id, "cancel", "item-not-found",
                                        error_message, false);
        }
      else if (message.command == "482" && message.arguments.size() >= 2)
        {
          const std::string chan_name_later = utils::tolower(message.arguments[1]);
          if (chan_name_later != iid.get_local())
            return false;
          std::string error_message = "You're not channel operator";
          if (message.arguments.size() >= 3)
            error_message = message.arguments[2];
          this->xmpp->send_stanza_error("iq", to_jid, std::to_string(iid), iq_id, "cancel", "not-allowed",
                                        error_message, false);
        }
      return true;
    };
  this->add_waiting_irc(std::move(cb));
}

void Bridge::set_channel_topic(const Iid& iid, const std::string& subject)
{
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (irc)
    irc->send_topic_command(iid.get_local(), subject);
}

void Bridge::send_xmpp_version_to_irc(const Iid& iid, const std::string& name, const std::string& version, const std::string& os)
{
  std::string result(name + " " + version + " " + os);

  this->send_private_message(iid, "\01VERSION "s + result + "\01", "NOTICE");
}

void Bridge::send_irc_ping_result(const Iid& iid, const std::string& id)
{
  this->send_private_message(iid, "\01PING "s + utils::revstr(id), "NOTICE");
}

void Bridge::send_irc_user_ping_request(const std::string& irc_hostname, const std::string& nick,
                                        const std::string& iq_id, const std::string& to_jid,
                                        const std::string& from_jid)
{
  Iid iid(nick + "!" + irc_hostname);
  this->send_private_message(iid, "\01PING " + iq_id + "\01");

  irc_responder_callback_t cb = [this, nick, iq_id, to_jid, irc_hostname, from_jid](const std::string& hostname, const IrcMessage& message) -> bool
    {
      if (irc_hostname != hostname)
        return false;
      IrcUser user(message.prefix);
      const std::string body = message.arguments[1];
      if (message.command == "NOTICE" && user.nick == nick &&
          message.arguments.size() >= 2 && body.substr(0, 6) == "\01PING ")
        {
          const std::string id = body.substr(6, body.size() - 6);
          if (id != iq_id)
            return false;
          Jid jid(from_jid);
          this->xmpp->send_iq_result(iq_id, to_jid, jid.local);
          return true;
        }
      if (message.command == "401" && message.arguments.size() >= 2
          && message.arguments[1] == nick)
        {
          std::string error_message = "No such nick";
          if (message.arguments.size() >= 3)
            error_message = message.arguments[2];
          this->xmpp->send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "service-unavailable",
                                        error_message, true);
          return true;
        }

      return false;
    };
  this->add_waiting_irc(std::move(cb));
}

void Bridge::send_irc_participant_ping_request(const Iid& iid, const std::string& nick,
                                               const std::string& iq_id, const std::string& to_jid,
                                               const std::string& from_jid)
{
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (!irc)
    {
      this->xmpp->send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "item-not-found",
                                    "Not connected to IRC server"s + iid.get_server(), true);
      return;
    }
  IrcChannel* chan = irc->get_channel(iid.get_local());
  if (!chan->joined)
    {
      this->xmpp->send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "not-allowed",
                                    "", true);
      return;
    }
  if (chan->get_self()->nick != nick && !chan->find_user(nick))
    {
      this->xmpp->send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "item-not-found",
                                    "Recipient not in room", true);
      return;
    }

  // The user is in the room, send it a direct PING
  this->send_irc_user_ping_request(iid.get_server(), nick, iq_id, to_jid, from_jid);
}

void Bridge::on_gateway_ping(const std::string& irc_hostname, const std::string& iq_id, const std::string& to_jid,
                             const std::string& from_jid)
{
  Jid jid(from_jid);
  if (irc_hostname.empty() || this->get_irc_client(irc_hostname))
    this->xmpp->send_iq_result(iq_id, to_jid, jid.local);
  else
    this->xmpp->send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "service-unavailable",
                                  "", true);
}

void Bridge::send_irc_version_request(const std::string& irc_hostname, const std::string& target,
                                      const std::string& iq_id, const std::string& to_jid,
                                      const std::string& from_jid)
{
  Iid iid(target + "!" + irc_hostname);
  this->send_private_message(iid, "\01VERSION\01");
  // TODO, add a timer to remove that waiting iq if the server does not
  // respond with a matching command before n seconds
  irc_responder_callback_t cb = [this, target, iq_id, to_jid, irc_hostname, from_jid](const std::string& hostname, const IrcMessage& message) -> bool
    {
      if (irc_hostname != hostname)
        return false;
      IrcUser user(message.prefix);
      if (message.command == "NOTICE" && user.nick == target &&
          message.arguments.size() >= 2 && message.arguments[1].substr(0, 9) == "\01VERSION ")
        {
          // remove the "\01VERSION " and the "\01" parts from the string
          const std::string version = message.arguments[1].substr(9, message.arguments[1].size() - 10);
          this->xmpp->send_version(iq_id, to_jid, from_jid, version);
          return true;
        }
      if (message.command == "401" && message.arguments.size() >= 2
          && message.arguments[1] == target)
        {
          std::string error_message = "No such nick";
          if (message.arguments.size() >= 3)
            error_message = message.arguments[2];
          this->xmpp->send_stanza_error("iq", to_jid, from_jid, iq_id, "cancel", "item-not-found",
                                        error_message, true);
          return true;
        }
      return false;
    };
  this->add_waiting_irc(std::move(cb));
}

void Bridge::send_message(const Iid& iid, const std::string& nick, const std::string& body, const bool muc)
{
  if (muc)
    this->xmpp->send_muc_message(std::to_string(iid), nick,
                                 this->make_xmpp_body(body), this->user_jid);
  else
    {
      std::string target = std::to_string(iid);
      bool fulljid = false;
      auto it = this->preferred_user_from.find(iid.get_local());
      if (it != this->preferred_user_from.end())
        {
          target = it->second;
          fulljid = true;
        }
      this->xmpp->send_message(target, this->make_xmpp_body(body),
                               this->user_jid, "chat", fulljid);
    }
}

void Bridge::send_presence_error(const Iid& iid, const std::string& nick,
                                 const std::string& type, const std::string& condition,
                                 const std::string& error_code, const std::string& text)
{
  this->xmpp->send_presence_error(std::to_string(iid), nick, this->user_jid, type, condition, error_code, text);
}

void Bridge::send_muc_leave(Iid&& iid, std::string&& nick, const std::string& message, const bool self)
{
  this->xmpp->send_muc_leave(std::to_string(iid), std::move(nick), this->make_xmpp_body(message), this->user_jid, self);
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (irc && irc->number_of_joined_channels() == 0)
    irc->send_quit_command("");
}

void Bridge::send_nick_change(Iid&& iid,
                              const std::string& old_nick,
                              const std::string& new_nick,
                              const char user_mode,
                              const bool self)
{
  std::string affiliation;
  std::string role;
  std::tie(role, affiliation) = get_role_affiliation_from_irc_mode(user_mode);

  this->xmpp->send_nick_change(std::to_string(iid),
                               old_nick, new_nick, affiliation, role, this->user_jid, self);
}

void Bridge::send_xmpp_message(const std::string& from, const std::string& author, const std::string& msg)
{
  std::string body;
  if (!author.empty())
    {
      IrcUser user(author);
      body = "\u000303"s + user.nick + (user.host.empty()?
                                        "\u0003: ":
                                        (" (\u000310" + user.host + "\u000303)\u0003: ")) + msg;
    }
  else
    body = msg;
  this->xmpp->send_message(from, this->make_xmpp_body(body), this->user_jid, "chat");
}

void Bridge::send_user_join(const std::string& hostname,
                            const std::string& chan_name,
                            const IrcUser* user,
                            const char user_mode,
                            const bool self)
{
  std::string affiliation;
  std::string role;
  std::tie(role, affiliation) = get_role_affiliation_from_irc_mode(user_mode);

  this->xmpp->send_user_join(chan_name + utils::empty_if_fixed_server("%" + hostname), user->nick, user->host,
                             affiliation, role, this->user_jid, self);
}

void Bridge::send_topic(const std::string& hostname, const std::string& chan_name, const std::string& topic)
{
  this->xmpp->send_topic(chan_name + utils::empty_if_fixed_server("%" + hostname), this->make_xmpp_body(topic), this->user_jid);
}

std::string Bridge::get_own_nick(const Iid& iid)
{
  IrcClient* irc = this->get_irc_client(iid.get_server());
  if (irc)
    return irc->get_own_nick();
  return "";
}

size_t Bridge::active_clients() const
{
  return this->irc_clients.size();
}

void Bridge::kick_muc_user(Iid&& iid, const std::string& target, const std::string& reason, const std::string& author)
{
  this->xmpp->kick_user(std::to_string(iid), target, reason, author, this->user_jid);
}

void Bridge::send_nickname_conflict_error(const Iid& iid, const std::string& nickname)
{
  this->xmpp->send_presence_error(std::to_string(iid), nickname, this->user_jid, "cancel", "conflict", "409", "");
}

void Bridge::send_affiliation_role_change(const Iid& iid, const std::string& target, const char mode)
{
  std::string role;
  std::string affiliation;

  std::tie(role, affiliation) = get_role_affiliation_from_irc_mode(mode);
  this->xmpp->send_affiliation_role_change(std::to_string(iid), target, affiliation, role, this->user_jid);
}

void Bridge::send_iq_version_request(const std::string& nick, const std::string& hostname)
{
  this->xmpp->send_iq_version_request(nick + "!" + utils::empty_if_fixed_server(hostname), this->user_jid);
}

void Bridge::send_xmpp_ping_request(const std::string& nick, const std::string& hostname,
                                    const std::string& id)
{
  // Use revstr because the forwarded ping to target XMPP user must not be
  // the same that the request iq, but we also need to get it back easily
  // (revstr again)
  this->xmpp->send_ping_request(nick + "!" + utils::empty_if_fixed_server(hostname), this->user_jid, utils::revstr(id));
}

void Bridge::set_preferred_from_jid(const std::string& nick, const std::string& full_jid)
{
  auto it = this->preferred_user_from.find(nick);
  if (it == this->preferred_user_from.end())
    this->preferred_user_from.emplace(nick, full_jid);
  else
    this->preferred_user_from[nick] = full_jid;
}

void Bridge::remove_preferred_from_jid(const std::string& nick)
{
  auto it = this->preferred_user_from.find(nick);
  if (it != this->preferred_user_from.end())
    this->preferred_user_from.erase(it);
}

void Bridge::add_waiting_irc(irc_responder_callback_t&& callback)
{
  this->waiting_irc.emplace_back(std::move(callback));
}

void Bridge::trigger_on_irc_message(const std::string& irc_hostname, const IrcMessage& message)
{
  auto it = this->waiting_irc.begin();
  while (it != this->waiting_irc.end())
    {
      if ((*it)(irc_hostname, message) == true)
        it = this->waiting_irc.erase(it);
      else
        ++it;
    }
}