source: code/trunk/downstream.go@ 445

Last change on this file since 445 was 441, checked in by contact, 4 years ago

Make chat history operations optional in messageStore

Some stores may want not to implement chat history operations.
File size: 45.4 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "fmt"
7 "io"
8 "net"
9 "strconv"
10 "strings"
11 "time"
12
13 "github.com/emersion/go-sasl"
14 "golang.org/x/crypto/bcrypt"
15 "gopkg.in/irc.v3"
16)
17
18type ircError struct {
19 Message *irc.Message
20}
21
22func (err ircError) Error() string {
23 return err.Message.String()
24}
25
26func newUnknownCommandError(cmd string) ircError {
27 return ircError{&irc.Message{
28 Command: irc.ERR_UNKNOWNCOMMAND,
29 Params: []string{
30 "*",
31 cmd,
32 "Unknown command",
33 },
34 }}
35}
36
37func newNeedMoreParamsError(cmd string) ircError {
38 return ircError{&irc.Message{
39 Command: irc.ERR_NEEDMOREPARAMS,
40 Params: []string{
41 "*",
42 cmd,
43 "Not enough parameters",
44 },
45 }}
46}
47
48func newChatHistoryError(subcommand string, target string) ircError {
49 return ircError{&irc.Message{
50 Command: "FAIL",
51 Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
52 }}
53}
54
55var errAuthFailed = ircError{&irc.Message{
56 Command: irc.ERR_PASSWDMISMATCH,
57 Params: []string{"*", "Invalid username or password"},
58}}
59
60// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
61// '*' and '?' break masks
62const illegalNickChars = " :@!*?"
63
64// permanentDownstreamCaps is the list of always-supported downstream
65// capabilities.
66var permanentDownstreamCaps = map[string]string{
67 "batch": "",
68 "cap-notify": "",
69 "echo-message": "",
70 "message-tags": "",
71 "sasl": "PLAIN",
72 "server-time": "",
73}
74
75// needAllDownstreamCaps is the list of downstream capabilities that
76// require support from all upstreams to be enabled
77var needAllDownstreamCaps = map[string]string{
78 "away-notify": "",
79 "extended-join": "",
80 "multi-prefix": "",
81}
82
83type downstreamConn struct {
84 conn
85
86 id uint64
87
88 registered bool
89 user *user
90 nick string
91 rawUsername string
92 networkName string
93 clientName string
94 realname string
95 hostname string
96 password string // empty after authentication
97 network *network // can be nil
98
99 negociatingCaps bool
100 capVersion int
101 supportedCaps map[string]string
102 caps map[string]bool
103
104 saslServer sasl.Server
105}
106
107func newDownstreamConn(srv *Server, ic ircConn, id uint64) *downstreamConn {
108 remoteAddr := ic.RemoteAddr().String()
109 logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
110 options := connOptions{Logger: logger}
111 dc := &downstreamConn{
112 conn: *newConn(srv, ic, &options),
113 id: id,
114 supportedCaps: make(map[string]string),
115 caps: make(map[string]bool),
116 }
117 dc.hostname = remoteAddr
118 if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
119 dc.hostname = host
120 }
121 for k, v := range permanentDownstreamCaps {
122 dc.supportedCaps[k] = v
123 }
124 if srv.LogPath != "" {
125 dc.supportedCaps["draft/chathistory"] = ""
126 }
127 return dc
128}
129
130func (dc *downstreamConn) prefix() *irc.Prefix {
131 return &irc.Prefix{
132 Name: dc.nick,
133 User: dc.user.Username,
134 Host: dc.hostname,
135 }
136}
137
138func (dc *downstreamConn) forEachNetwork(f func(*network)) {
139 if dc.network != nil {
140 f(dc.network)
141 } else {
142 dc.user.forEachNetwork(f)
143 }
144}
145
146func (dc *downstreamConn) forEachUpstream(f func(*upstreamConn)) {
147 dc.user.forEachUpstream(func(uc *upstreamConn) {
148 if dc.network != nil && uc.network != dc.network {
149 return
150 }
151 f(uc)
152 })
153}
154
155// upstream returns the upstream connection, if any. If there are zero or if
156// there are multiple upstream connections, it returns nil.
157func (dc *downstreamConn) upstream() *upstreamConn {
158 if dc.network == nil {
159 return nil
160 }
161 return dc.network.conn
162}
163
164func isOurNick(net *network, nick string) bool {
165 // TODO: this doesn't account for nick changes
166 if net.conn != nil {
167 return nick == net.conn.nick
168 }
169 // We're not currently connected to the upstream connection, so we don't
170 // know whether this name is our nickname. Best-effort: use the network's
171 // configured nickname and hope it was the one being used when we were
172 // connected.
173 return nick == net.Nick
174}
175
176// marshalEntity converts an upstream entity name (ie. channel or nick) into a
177// downstream entity name.
178//
179// This involves adding a "/<network>" suffix if the entity isn't the current
180// user.
181func (dc *downstreamConn) marshalEntity(net *network, name string) string {
182 if isOurNick(net, name) {
183 return dc.nick
184 }
185 if dc.network != nil {
186 if dc.network != net {
187 panic("soju: tried to marshal an entity for another network")
188 }
189 return name
190 }
191 return name + "/" + net.GetName()
192}
193
194func (dc *downstreamConn) marshalUserPrefix(net *network, prefix *irc.Prefix) *irc.Prefix {
195 if isOurNick(net, prefix.Name) {
196 return dc.prefix()
197 }
198 if dc.network != nil {
199 if dc.network != net {
200 panic("soju: tried to marshal a user prefix for another network")
201 }
202 return prefix
203 }
204 return &irc.Prefix{
205 Name: prefix.Name + "/" + net.GetName(),
206 User: prefix.User,
207 Host: prefix.Host,
208 }
209}
210
211// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
212// an upstream entity name.
213//
214// This involves removing the "/<network>" suffix.
215func (dc *downstreamConn) unmarshalEntity(name string) (*upstreamConn, string, error) {
216 if uc := dc.upstream(); uc != nil {
217 return uc, name, nil
218 }
219
220 var conn *upstreamConn
221 if i := strings.LastIndexByte(name, '/'); i >= 0 {
222 network := name[i+1:]
223 name = name[:i]
224
225 dc.forEachUpstream(func(uc *upstreamConn) {
226 if network != uc.network.GetName() {
227 return
228 }
229 conn = uc
230 })
231 }
232
233 if conn == nil {
234 return nil, "", ircError{&irc.Message{
235 Command: irc.ERR_NOSUCHCHANNEL,
236 Params: []string{name, "No such channel"},
237 }}
238 }
239 return conn, name, nil
240}
241
242func (dc *downstreamConn) unmarshalText(uc *upstreamConn, text string) string {
243 if dc.upstream() != nil {
244 return text
245 }
246 // TODO: smarter parsing that ignores URLs
247 return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
248}
249
250func (dc *downstreamConn) readMessages(ch chan<- event) error {
251 for {
252 msg, err := dc.ReadMessage()
253 if err == io.EOF {
254 break
255 } else if err != nil {
256 return fmt.Errorf("failed to read IRC command: %v", err)
257 }
258
259 ch <- eventDownstreamMessage{msg, dc}
260 }
261
262 return nil
263}
264
265// SendMessage sends an outgoing message.
266//
267// This can only called from the user goroutine.
268func (dc *downstreamConn) SendMessage(msg *irc.Message) {
269 if !dc.caps["message-tags"] {
270 if msg.Command == "TAGMSG" {
271 return
272 }
273 msg = msg.Copy()
274 for name := range msg.Tags {
275 supported := false
276 switch name {
277 case "time":
278 supported = dc.caps["server-time"]
279 }
280 if !supported {
281 delete(msg.Tags, name)
282 }
283 }
284 }
285 if msg.Command == "JOIN" && !dc.caps["extended-join"] {
286 msg.Params = msg.Params[:1]
287 }
288
289 dc.conn.SendMessage(msg)
290}
291
292// sendMessageWithID sends an outgoing message with the specified internal ID.
293func (dc *downstreamConn) sendMessageWithID(msg *irc.Message, id string) {
294 dc.SendMessage(msg)
295
296 if id == "" || !dc.messageSupportsHistory(msg) {
297 return
298 }
299
300 dc.sendPing(id)
301}
302
303// advanceMessageWithID advances history to the specified message ID without
304// sending a message. This is useful e.g. for self-messages when echo-message
305// isn't enabled.
306func (dc *downstreamConn) advanceMessageWithID(msg *irc.Message, id string) {
307 if id == "" || !dc.messageSupportsHistory(msg) {
308 return
309 }
310
311 dc.sendPing(id)
312}
313
314// ackMsgID acknowledges that a message has been received.
315func (dc *downstreamConn) ackMsgID(id string) {
316 netID, entity, _, err := parseMsgID(id)
317 if err != nil {
318 dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
319 return
320 }
321
322 network := dc.user.getNetworkByID(netID)
323 if network == nil {
324 return
325 }
326
327 history, ok := network.history[entity]
328 if !ok {
329 return
330 }
331
332 history.clients[dc.clientName] = id
333}
334
335func (dc *downstreamConn) sendPing(msgID string) {
336 token := "soju-msgid-" + base64.RawURLEncoding.EncodeToString([]byte(msgID))
337 dc.SendMessage(&irc.Message{
338 Command: "PING",
339 Params: []string{token},
340 })
341}
342
343func (dc *downstreamConn) handlePong(token string) {
344 if !strings.HasPrefix(token, "soju-msgid-") {
345 dc.logger.Printf("received unrecognized PONG token %q", token)
346 return
347 }
348 token = strings.TrimPrefix(token, "soju-msgid-")
349 b, err := base64.RawURLEncoding.DecodeString(token)
350 if err != nil {
351 dc.logger.Printf("received malformed PONG token: %v", err)
352 return
353 }
354 msgID := string(b)
355
356 dc.ackMsgID(msgID)
357}
358
359// marshalMessage re-formats a message coming from an upstream connection so
360// that it's suitable for being sent on this downstream connection. Only
361// messages that may appear in logs are supported, except MODE.
362func (dc *downstreamConn) marshalMessage(msg *irc.Message, net *network) *irc.Message {
363 msg = msg.Copy()
364 msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
365
366 switch msg.Command {
367 case "PRIVMSG", "NOTICE", "TAGMSG":
368 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
369 case "NICK":
370 // Nick change for another user
371 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
372 case "JOIN", "PART":
373 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
374 case "KICK":
375 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
376 msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
377 case "TOPIC":
378 msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
379 case "QUIT":
380 // This space is intentionally left blank
381 default:
382 panic(fmt.Sprintf("unexpected %q message", msg.Command))
383 }
384
385 return msg
386}
387
388func (dc *downstreamConn) handleMessage(msg *irc.Message) error {
389 switch msg.Command {
390 case "QUIT":
391 return dc.Close()
392 default:
393 if dc.registered {
394 return dc.handleMessageRegistered(msg)
395 } else {
396 return dc.handleMessageUnregistered(msg)
397 }
398 }
399}
400
401func (dc *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
402 switch msg.Command {
403 case "NICK":
404 var nick string
405 if err := parseMessageParams(msg, &nick); err != nil {
406 return err
407 }
408 if strings.ContainsAny(nick, illegalNickChars) {
409 return ircError{&irc.Message{
410 Command: irc.ERR_ERRONEUSNICKNAME,
411 Params: []string{dc.nick, nick, "contains illegal characters"},
412 }}
413 }
414 if nick == serviceNick {
415 return ircError{&irc.Message{
416 Command: irc.ERR_NICKNAMEINUSE,
417 Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
418 }}
419 }
420 dc.nick = nick
421 case "USER":
422 if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
423 return err
424 }
425 case "PASS":
426 if err := parseMessageParams(msg, &dc.password); err != nil {
427 return err
428 }
429 case "CAP":
430 var subCmd string
431 if err := parseMessageParams(msg, &subCmd); err != nil {
432 return err
433 }
434 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
435 return err
436 }
437 case "AUTHENTICATE":
438 if !dc.caps["sasl"] {
439 return ircError{&irc.Message{
440 Command: irc.ERR_SASLFAIL,
441 Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
442 }}
443 }
444 if len(msg.Params) == 0 {
445 return ircError{&irc.Message{
446 Command: irc.ERR_SASLFAIL,
447 Params: []string{"*", "Missing AUTHENTICATE argument"},
448 }}
449 }
450 if dc.nick == "" {
451 return ircError{&irc.Message{
452 Command: irc.ERR_SASLFAIL,
453 Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
454 }}
455 }
456
457 var resp []byte
458 if dc.saslServer == nil {
459 mech := strings.ToUpper(msg.Params[0])
460 switch mech {
461 case "PLAIN":
462 dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
463 return dc.authenticate(username, password)
464 }))
465 default:
466 return ircError{&irc.Message{
467 Command: irc.ERR_SASLFAIL,
468 Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
469 }}
470 }
471 } else if msg.Params[0] == "*" {
472 dc.saslServer = nil
473 return ircError{&irc.Message{
474 Command: irc.ERR_SASLABORTED,
475 Params: []string{"*", "SASL authentication aborted"},
476 }}
477 } else if msg.Params[0] == "+" {
478 resp = nil
479 } else {
480 // TODO: multi-line messages
481 var err error
482 resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
483 if err != nil {
484 dc.saslServer = nil
485 return ircError{&irc.Message{
486 Command: irc.ERR_SASLFAIL,
487 Params: []string{"*", "Invalid base64-encoded response"},
488 }}
489 }
490 }
491
492 challenge, done, err := dc.saslServer.Next(resp)
493 if err != nil {
494 dc.saslServer = nil
495 if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
496 return ircError{&irc.Message{
497 Command: irc.ERR_SASLFAIL,
498 Params: []string{"*", ircErr.Message.Params[1]},
499 }}
500 }
501 dc.SendMessage(&irc.Message{
502 Prefix: dc.srv.prefix(),
503 Command: irc.ERR_SASLFAIL,
504 Params: []string{"*", "SASL error"},
505 })
506 return fmt.Errorf("SASL authentication failed: %v", err)
507 } else if done {
508 dc.saslServer = nil
509 dc.SendMessage(&irc.Message{
510 Prefix: dc.srv.prefix(),
511 Command: irc.RPL_LOGGEDIN,
512 Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
513 })
514 dc.SendMessage(&irc.Message{
515 Prefix: dc.srv.prefix(),
516 Command: irc.RPL_SASLSUCCESS,
517 Params: []string{dc.nick, "SASL authentication successful"},
518 })
519 } else {
520 challengeStr := "+"
521 if len(challenge) > 0 {
522 challengeStr = base64.StdEncoding.EncodeToString(challenge)
523 }
524
525 // TODO: multi-line messages
526 dc.SendMessage(&irc.Message{
527 Prefix: dc.srv.prefix(),
528 Command: "AUTHENTICATE",
529 Params: []string{challengeStr},
530 })
531 }
532 default:
533 dc.logger.Printf("unhandled message: %v", msg)
534 return newUnknownCommandError(msg.Command)
535 }
536 if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
537 return dc.register()
538 }
539 return nil
540}
541
542func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
543 cmd = strings.ToUpper(cmd)
544
545 replyTo := dc.nick
546 if !dc.registered {
547 replyTo = "*"
548 }
549
550 switch cmd {
551 case "LS":
552 if len(args) > 0 {
553 var err error
554 if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
555 return err
556 }
557 }
558 if !dc.registered && dc.capVersion >= 302 {
559 // Let downstream show everything it supports, and trim
560 // down the available capabilities when upstreams are
561 // known.
562 for k, v := range needAllDownstreamCaps {
563 dc.supportedCaps[k] = v
564 }
565 }
566
567 caps := make([]string, 0, len(dc.supportedCaps))
568 for k, v := range dc.supportedCaps {
569 if dc.capVersion >= 302 && v != "" {
570 caps = append(caps, k+"="+v)
571 } else {
572 caps = append(caps, k)
573 }
574 }
575
576 // TODO: multi-line replies
577 dc.SendMessage(&irc.Message{
578 Prefix: dc.srv.prefix(),
579 Command: "CAP",
580 Params: []string{replyTo, "LS", strings.Join(caps, " ")},
581 })
582
583 if dc.capVersion >= 302 {
584 // CAP version 302 implicitly enables cap-notify
585 dc.caps["cap-notify"] = true
586 }
587
588 if !dc.registered {
589 dc.negociatingCaps = true
590 }
591 case "LIST":
592 var caps []string
593 for name := range dc.caps {
594 caps = append(caps, name)
595 }
596
597 // TODO: multi-line replies
598 dc.SendMessage(&irc.Message{
599 Prefix: dc.srv.prefix(),
600 Command: "CAP",
601 Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
602 })
603 case "REQ":
604 if len(args) == 0 {
605 return ircError{&irc.Message{
606 Command: err_invalidcapcmd,
607 Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
608 }}
609 }
610
611 // TODO: atomically ack/nak the whole capability set
612 caps := strings.Fields(args[0])
613 ack := true
614 for _, name := range caps {
615 name = strings.ToLower(name)
616 enable := !strings.HasPrefix(name, "-")
617 if !enable {
618 name = strings.TrimPrefix(name, "-")
619 }
620
621 if enable == dc.caps[name] {
622 continue
623 }
624
625 _, ok := dc.supportedCaps[name]
626 if !ok {
627 ack = false
628 break
629 }
630
631 if name == "cap-notify" && dc.capVersion >= 302 && !enable {
632 // cap-notify cannot be disabled with CAP version 302
633 ack = false
634 break
635 }
636
637 dc.caps[name] = enable
638 }
639
640 reply := "NAK"
641 if ack {
642 reply = "ACK"
643 }
644 dc.SendMessage(&irc.Message{
645 Prefix: dc.srv.prefix(),
646 Command: "CAP",
647 Params: []string{replyTo, reply, args[0]},
648 })
649 case "END":
650 dc.negociatingCaps = false
651 default:
652 return ircError{&irc.Message{
653 Command: err_invalidcapcmd,
654 Params: []string{replyTo, cmd, "Unknown CAP command"},
655 }}
656 }
657 return nil
658}
659
660func (dc *downstreamConn) setSupportedCap(name, value string) {
661 prevValue, hasPrev := dc.supportedCaps[name]
662 changed := !hasPrev || prevValue != value
663 dc.supportedCaps[name] = value
664
665 if !dc.caps["cap-notify"] || !changed {
666 return
667 }
668
669 replyTo := dc.nick
670 if !dc.registered {
671 replyTo = "*"
672 }
673
674 cap := name
675 if value != "" && dc.capVersion >= 302 {
676 cap = name + "=" + value
677 }
678
679 dc.SendMessage(&irc.Message{
680 Prefix: dc.srv.prefix(),
681 Command: "CAP",
682 Params: []string{replyTo, "NEW", cap},
683 })
684}
685
686func (dc *downstreamConn) unsetSupportedCap(name string) {
687 _, hasPrev := dc.supportedCaps[name]
688 delete(dc.supportedCaps, name)
689 delete(dc.caps, name)
690
691 if !dc.caps["cap-notify"] || !hasPrev {
692 return
693 }
694
695 replyTo := dc.nick
696 if !dc.registered {
697 replyTo = "*"
698 }
699
700 dc.SendMessage(&irc.Message{
701 Prefix: dc.srv.prefix(),
702 Command: "CAP",
703 Params: []string{replyTo, "DEL", name},
704 })
705}
706
707func (dc *downstreamConn) updateSupportedCaps() {
708 supportedCaps := make(map[string]bool)
709 for cap := range needAllDownstreamCaps {
710 supportedCaps[cap] = true
711 }
712 dc.forEachUpstream(func(uc *upstreamConn) {
713 for cap, supported := range supportedCaps {
714 supportedCaps[cap] = supported && uc.caps[cap]
715 }
716 })
717
718 for cap, supported := range supportedCaps {
719 if supported {
720 dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
721 } else {
722 dc.unsetSupportedCap(cap)
723 }
724 }
725}
726
727func (dc *downstreamConn) updateNick() {
728 if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
729 dc.SendMessage(&irc.Message{
730 Prefix: dc.prefix(),
731 Command: "NICK",
732 Params: []string{uc.nick},
733 })
734 dc.nick = uc.nick
735 }
736}
737
738func sanityCheckServer(addr string) error {
739 dialer := net.Dialer{Timeout: 30 * time.Second}
740 conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
741 if err != nil {
742 return err
743 }
744 return conn.Close()
745}
746
747func unmarshalUsername(rawUsername string) (username, client, network string) {
748 username = rawUsername
749
750 i := strings.IndexAny(username, "/@")
751 j := strings.LastIndexAny(username, "/@")
752 if i >= 0 {
753 username = rawUsername[:i]
754 }
755 if j >= 0 {
756 if rawUsername[j] == '@' {
757 client = rawUsername[j+1:]
758 } else {
759 network = rawUsername[j+1:]
760 }
761 }
762 if i >= 0 && j >= 0 && i < j {
763 if rawUsername[i] == '@' {
764 client = rawUsername[i+1 : j]
765 } else {
766 network = rawUsername[i+1 : j]
767 }
768 }
769
770 return username, client, network
771}
772
773func (dc *downstreamConn) authenticate(username, password string) error {
774 username, clientName, networkName := unmarshalUsername(username)
775
776 u, err := dc.srv.db.GetUser(username)
777 if err != nil {
778 dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
779 return errAuthFailed
780 }
781
782 // Password auth disabled
783 if u.Password == "" {
784 return errAuthFailed
785 }
786
787 err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
788 if err != nil {
789 dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
790 return errAuthFailed
791 }
792
793 dc.user = dc.srv.getUser(username)
794 if dc.user == nil {
795 dc.logger.Printf("failed authentication for %q: user not active", username)
796 return errAuthFailed
797 }
798 dc.clientName = clientName
799 dc.networkName = networkName
800 return nil
801}
802
803func (dc *downstreamConn) register() error {
804 if dc.registered {
805 return fmt.Errorf("tried to register twice")
806 }
807
808 password := dc.password
809 dc.password = ""
810 if dc.user == nil {
811 if err := dc.authenticate(dc.rawUsername, password); err != nil {
812 return err
813 }
814 }
815
816 if dc.clientName == "" && dc.networkName == "" {
817 _, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
818 }
819
820 dc.registered = true
821 dc.logger.Printf("registration complete for user %q", dc.user.Username)
822 return nil
823}
824
825func (dc *downstreamConn) loadNetwork() error {
826 if dc.networkName == "" {
827 return nil
828 }
829
830 network := dc.user.getNetwork(dc.networkName)
831 if network == nil {
832 addr := dc.networkName
833 if !strings.ContainsRune(addr, ':') {
834 addr = addr + ":6697"
835 }
836
837 dc.logger.Printf("trying to connect to new network %q", addr)
838 if err := sanityCheckServer(addr); err != nil {
839 dc.logger.Printf("failed to connect to %q: %v", addr, err)
840 return ircError{&irc.Message{
841 Command: irc.ERR_PASSWDMISMATCH,
842 Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
843 }}
844 }
845
846 // Some clients only allow specifying the nickname (and use the
847 // nickname as a username too). Strip the network name from the
848 // nickname when auto-saving networks.
849 nick, _, _ := unmarshalUsername(dc.nick)
850
851 dc.logger.Printf("auto-saving network %q", dc.networkName)
852 var err error
853 network, err = dc.user.createNetwork(&Network{
854 Addr: dc.networkName,
855 Nick: nick,
856 })
857 if err != nil {
858 return err
859 }
860 }
861
862 dc.network = network
863 return nil
864}
865
866func (dc *downstreamConn) welcome() error {
867 if dc.user == nil || !dc.registered {
868 panic("tried to welcome an unregistered connection")
869 }
870
871 // TODO: doing this might take some time. We should do it in dc.register
872 // instead, but we'll potentially be adding a new network and this must be
873 // done in the user goroutine.
874 if err := dc.loadNetwork(); err != nil {
875 return err
876 }
877
878 dc.SendMessage(&irc.Message{
879 Prefix: dc.srv.prefix(),
880 Command: irc.RPL_WELCOME,
881 Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
882 })
883 dc.SendMessage(&irc.Message{
884 Prefix: dc.srv.prefix(),
885 Command: irc.RPL_YOURHOST,
886 Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
887 })
888 dc.SendMessage(&irc.Message{
889 Prefix: dc.srv.prefix(),
890 Command: irc.RPL_CREATED,
891 Params: []string{dc.nick, "Who cares when the server was created?"},
892 })
893 dc.SendMessage(&irc.Message{
894 Prefix: dc.srv.prefix(),
895 Command: irc.RPL_MYINFO,
896 Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
897 })
898 // TODO: RPL_ISUPPORT
899 // TODO: send CHATHISTORY in RPL_ISUPPORT when implemented
900 dc.SendMessage(&irc.Message{
901 Prefix: dc.srv.prefix(),
902 Command: irc.ERR_NOMOTD,
903 Params: []string{dc.nick, "No MOTD"},
904 })
905
906 dc.updateNick()
907 dc.updateSupportedCaps()
908
909 dc.forEachUpstream(func(uc *upstreamConn) {
910 for _, ch := range uc.channels {
911 if !ch.complete {
912 continue
913 }
914 if record, ok := uc.network.channels[ch.Name]; ok && record.Detached {
915 continue
916 }
917
918 dc.SendMessage(&irc.Message{
919 Prefix: dc.prefix(),
920 Command: "JOIN",
921 Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
922 })
923
924 forwardChannel(dc, ch)
925 }
926 })
927
928 dc.forEachNetwork(func(net *network) {
929 // Only send history if we're the first connected client with that name
930 // for the network
931 if _, ok := net.offlineClients[dc.clientName]; ok {
932 dc.sendNetworkHistory(net)
933 delete(net.offlineClients, dc.clientName)
934 }
935
936 // Fast-forward history to last message
937 for target, history := range net.history {
938 if ch, ok := net.channels[target]; ok && ch.Detached {
939 continue
940 }
941
942 lastID, err := dc.user.msgStore.LastMsgID(net, target, time.Now())
943 if err != nil {
944 dc.logger.Printf("failed to get last message ID: %v", err)
945 continue
946 }
947 history.clients[dc.clientName] = lastID
948 }
949 })
950
951 return nil
952}
953
954// messageSupportsHistory checks whether the provided message can be sent as
955// part of an history batch.
956func (dc *downstreamConn) messageSupportsHistory(msg *irc.Message) bool {
957 // Don't replay all messages, because that would mess up client
958 // state. For instance we just sent the list of users, sending
959 // PART messages for one of these users would be incorrect.
960 // TODO: add support for draft/event-playback
961 switch msg.Command {
962 case "PRIVMSG", "NOTICE":
963 return true
964 }
965 return false
966}
967
968func (dc *downstreamConn) sendNetworkHistory(net *network) {
969 if dc.caps["draft/chathistory"] || dc.user.msgStore == nil {
970 return
971 }
972 for target, history := range net.history {
973 if ch, ok := net.channels[target]; ok && ch.Detached {
974 continue
975 }
976
977 lastDelivered, ok := history.clients[dc.clientName]
978 if !ok {
979 continue
980 }
981
982 limit := 4000
983 history, err := dc.user.msgStore.LoadLatestID(net, target, lastDelivered, limit)
984 if err != nil {
985 dc.logger.Printf("failed to send implicit history for %q: %v", target, err)
986 continue
987 }
988
989 batchRef := "history"
990 if dc.caps["batch"] {
991 dc.SendMessage(&irc.Message{
992 Prefix: dc.srv.prefix(),
993 Command: "BATCH",
994 Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
995 })
996 }
997
998 for _, msg := range history {
999 if !dc.messageSupportsHistory(msg) {
1000 continue
1001 }
1002
1003 if dc.caps["batch"] {
1004 msg.Tags["batch"] = irc.TagValue(batchRef)
1005 }
1006 dc.SendMessage(dc.marshalMessage(msg, net))
1007 }
1008
1009 if dc.caps["batch"] {
1010 dc.SendMessage(&irc.Message{
1011 Prefix: dc.srv.prefix(),
1012 Command: "BATCH",
1013 Params: []string{"-" + batchRef},
1014 })
1015 }
1016 }
1017}
1018
1019func (dc *downstreamConn) runUntilRegistered() error {
1020 for !dc.registered {
1021 msg, err := dc.ReadMessage()
1022 if err != nil {
1023 return fmt.Errorf("failed to read IRC command: %v", err)
1024 }
1025
1026 err = dc.handleMessage(msg)
1027 if ircErr, ok := err.(ircError); ok {
1028 ircErr.Message.Prefix = dc.srv.prefix()
1029 dc.SendMessage(ircErr.Message)
1030 } else if err != nil {
1031 return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
1032 }
1033 }
1034
1035 return nil
1036}
1037
1038func (dc *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
1039 switch msg.Command {
1040 case "CAP":
1041 var subCmd string
1042 if err := parseMessageParams(msg, &subCmd); err != nil {
1043 return err
1044 }
1045 if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
1046 return err
1047 }
1048 case "PING":
1049 var source, destination string
1050 if err := parseMessageParams(msg, &source); err != nil {
1051 return err
1052 }
1053 if len(msg.Params) > 1 {
1054 destination = msg.Params[1]
1055 }
1056 if destination != "" && destination != dc.srv.Hostname {
1057 return ircError{&irc.Message{
1058 Command: irc.ERR_NOSUCHSERVER,
1059 Params: []string{dc.nick, destination, "No such server"},
1060 }}
1061 }
1062 dc.SendMessage(&irc.Message{
1063 Prefix: dc.srv.prefix(),
1064 Command: "PONG",
1065 Params: []string{dc.srv.Hostname, source},
1066 })
1067 return nil
1068 case "PONG":
1069 if len(msg.Params) == 0 {
1070 return newNeedMoreParamsError(msg.Command)
1071 }
1072 token := msg.Params[len(msg.Params)-1]
1073 dc.handlePong(token)
1074 case "USER":
1075 return ircError{&irc.Message{
1076 Command: irc.ERR_ALREADYREGISTERED,
1077 Params: []string{dc.nick, "You may not reregister"},
1078 }}
1079 case "NICK":
1080 var rawNick string
1081 if err := parseMessageParams(msg, &rawNick); err != nil {
1082 return err
1083 }
1084
1085 nick := rawNick
1086 var upstream *upstreamConn
1087 if dc.upstream() == nil {
1088 uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
1089 if err == nil { // NICK nick/network: NICK only on a specific upstream
1090 upstream = uc
1091 nick = unmarshaledNick
1092 }
1093 }
1094
1095 if strings.ContainsAny(nick, illegalNickChars) {
1096 return ircError{&irc.Message{
1097 Command: irc.ERR_ERRONEUSNICKNAME,
1098 Params: []string{dc.nick, rawNick, "contains illegal characters"},
1099 }}
1100 }
1101 if nick == serviceNick {
1102 return ircError{&irc.Message{
1103 Command: irc.ERR_NICKNAMEINUSE,
1104 Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
1105 }}
1106 }
1107
1108 var err error
1109 dc.forEachNetwork(func(n *network) {
1110 if err != nil || (upstream != nil && upstream.network != n) {
1111 return
1112 }
1113 n.Nick = nick
1114 err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
1115 })
1116 if err != nil {
1117 return err
1118 }
1119
1120 dc.forEachUpstream(func(uc *upstreamConn) {
1121 if upstream != nil && upstream != uc {
1122 return
1123 }
1124 uc.SendMessageLabeled(dc.id, &irc.Message{
1125 Command: "NICK",
1126 Params: []string{nick},
1127 })
1128 })
1129
1130 if dc.upstream() == nil && dc.nick != nick {
1131 dc.SendMessage(&irc.Message{
1132 Prefix: dc.prefix(),
1133 Command: "NICK",
1134 Params: []string{nick},
1135 })
1136 dc.nick = nick
1137 }
1138 case "JOIN":
1139 var namesStr string
1140 if err := parseMessageParams(msg, &namesStr); err != nil {
1141 return err
1142 }
1143
1144 var keys []string
1145 if len(msg.Params) > 1 {
1146 keys = strings.Split(msg.Params[1], ",")
1147 }
1148
1149 for i, name := range strings.Split(namesStr, ",") {
1150 uc, upstreamName, err := dc.unmarshalEntity(name)
1151 if err != nil {
1152 return err
1153 }
1154
1155 var key string
1156 if len(keys) > i {
1157 key = keys[i]
1158 }
1159
1160 params := []string{upstreamName}
1161 if key != "" {
1162 params = append(params, key)
1163 }
1164 uc.SendMessageLabeled(dc.id, &irc.Message{
1165 Command: "JOIN",
1166 Params: params,
1167 })
1168
1169 var ch *Channel
1170 var ok bool
1171 if ch, ok = uc.network.channels[upstreamName]; ok {
1172 // Don't clear the channel key if there's one set
1173 // TODO: add a way to unset the channel key
1174 if key != "" {
1175 ch.Key = key
1176 }
1177 uc.network.attach(ch)
1178 } else {
1179 ch = &Channel{
1180 Name: upstreamName,
1181 Key: key,
1182 }
1183 uc.network.channels[upstreamName] = ch
1184 }
1185 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1186 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1187 }
1188 }
1189 case "PART":
1190 var namesStr string
1191 if err := parseMessageParams(msg, &namesStr); err != nil {
1192 return err
1193 }
1194
1195 var reason string
1196 if len(msg.Params) > 1 {
1197 reason = msg.Params[1]
1198 }
1199
1200 for _, name := range strings.Split(namesStr, ",") {
1201 uc, upstreamName, err := dc.unmarshalEntity(name)
1202 if err != nil {
1203 return err
1204 }
1205
1206 if strings.EqualFold(reason, "detach") {
1207 var ch *Channel
1208 var ok bool
1209 if ch, ok = uc.network.channels[upstreamName]; ok {
1210 uc.network.detach(ch)
1211 } else {
1212 ch = &Channel{
1213 Name: name,
1214 Detached: true,
1215 }
1216 uc.network.channels[upstreamName] = ch
1217 }
1218 if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
1219 dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
1220 }
1221 } else {
1222 params := []string{upstreamName}
1223 if reason != "" {
1224 params = append(params, reason)
1225 }
1226 uc.SendMessageLabeled(dc.id, &irc.Message{
1227 Command: "PART",
1228 Params: params,
1229 })
1230
1231 if err := uc.network.deleteChannel(upstreamName); err != nil {
1232 dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
1233 }
1234 }
1235 }
1236 case "KICK":
1237 var channelStr, userStr string
1238 if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
1239 return err
1240 }
1241
1242 channels := strings.Split(channelStr, ",")
1243 users := strings.Split(userStr, ",")
1244
1245 var reason string
1246 if len(msg.Params) > 2 {
1247 reason = msg.Params[2]
1248 }
1249
1250 if len(channels) != 1 && len(channels) != len(users) {
1251 return ircError{&irc.Message{
1252 Command: irc.ERR_BADCHANMASK,
1253 Params: []string{dc.nick, channelStr, "Bad channel mask"},
1254 }}
1255 }
1256
1257 for i, user := range users {
1258 var channel string
1259 if len(channels) == 1 {
1260 channel = channels[0]
1261 } else {
1262 channel = channels[i]
1263 }
1264
1265 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1266 if err != nil {
1267 return err
1268 }
1269
1270 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1271 if err != nil {
1272 return err
1273 }
1274
1275 if ucChannel != ucUser {
1276 return ircError{&irc.Message{
1277 Command: irc.ERR_USERNOTINCHANNEL,
1278 Params: []string{dc.nick, user, channel, "They are on another network"},
1279 }}
1280 }
1281 uc := ucChannel
1282
1283 params := []string{upstreamChannel, upstreamUser}
1284 if reason != "" {
1285 params = append(params, reason)
1286 }
1287 uc.SendMessageLabeled(dc.id, &irc.Message{
1288 Command: "KICK",
1289 Params: params,
1290 })
1291 }
1292 case "MODE":
1293 var name string
1294 if err := parseMessageParams(msg, &name); err != nil {
1295 return err
1296 }
1297
1298 var modeStr string
1299 if len(msg.Params) > 1 {
1300 modeStr = msg.Params[1]
1301 }
1302
1303 if name == dc.nick {
1304 if modeStr != "" {
1305 dc.forEachUpstream(func(uc *upstreamConn) {
1306 uc.SendMessageLabeled(dc.id, &irc.Message{
1307 Command: "MODE",
1308 Params: []string{uc.nick, modeStr},
1309 })
1310 })
1311 } else {
1312 dc.SendMessage(&irc.Message{
1313 Prefix: dc.srv.prefix(),
1314 Command: irc.RPL_UMODEIS,
1315 Params: []string{dc.nick, ""}, // TODO
1316 })
1317 }
1318 return nil
1319 }
1320
1321 uc, upstreamName, err := dc.unmarshalEntity(name)
1322 if err != nil {
1323 return err
1324 }
1325
1326 if !uc.isChannel(upstreamName) {
1327 return ircError{&irc.Message{
1328 Command: irc.ERR_USERSDONTMATCH,
1329 Params: []string{dc.nick, "Cannot change mode for other users"},
1330 }}
1331 }
1332
1333 if modeStr != "" {
1334 params := []string{upstreamName, modeStr}
1335 params = append(params, msg.Params[2:]...)
1336 uc.SendMessageLabeled(dc.id, &irc.Message{
1337 Command: "MODE",
1338 Params: params,
1339 })
1340 } else {
1341 ch, ok := uc.channels[upstreamName]
1342 if !ok {
1343 return ircError{&irc.Message{
1344 Command: irc.ERR_NOSUCHCHANNEL,
1345 Params: []string{dc.nick, name, "No such channel"},
1346 }}
1347 }
1348
1349 if ch.modes == nil {
1350 // we haven't received the initial RPL_CHANNELMODEIS yet
1351 // ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
1352 return nil
1353 }
1354
1355 modeStr, modeParams := ch.modes.Format()
1356 params := []string{dc.nick, name, modeStr}
1357 params = append(params, modeParams...)
1358
1359 dc.SendMessage(&irc.Message{
1360 Prefix: dc.srv.prefix(),
1361 Command: irc.RPL_CHANNELMODEIS,
1362 Params: params,
1363 })
1364 if ch.creationTime != "" {
1365 dc.SendMessage(&irc.Message{
1366 Prefix: dc.srv.prefix(),
1367 Command: rpl_creationtime,
1368 Params: []string{dc.nick, name, ch.creationTime},
1369 })
1370 }
1371 }
1372 case "TOPIC":
1373 var channel string
1374 if err := parseMessageParams(msg, &channel); err != nil {
1375 return err
1376 }
1377
1378 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1379 if err != nil {
1380 return err
1381 }
1382
1383 if len(msg.Params) > 1 { // setting topic
1384 topic := msg.Params[1]
1385 uc.SendMessageLabeled(dc.id, &irc.Message{
1386 Command: "TOPIC",
1387 Params: []string{upstreamChannel, topic},
1388 })
1389 } else { // getting topic
1390 ch, ok := uc.channels[upstreamChannel]
1391 if !ok {
1392 return ircError{&irc.Message{
1393 Command: irc.ERR_NOSUCHCHANNEL,
1394 Params: []string{dc.nick, upstreamChannel, "No such channel"},
1395 }}
1396 }
1397 sendTopic(dc, ch)
1398 }
1399 case "LIST":
1400 // TODO: support ELIST when supported by all upstreams
1401
1402 pl := pendingLIST{
1403 downstreamID: dc.id,
1404 pendingCommands: make(map[int64]*irc.Message),
1405 }
1406 var upstream *upstreamConn
1407 var upstreamChannels map[int64][]string
1408 if len(msg.Params) > 0 {
1409 uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
1410 if err == nil && upstreamMask == "*" { // LIST */network: send LIST only to one network
1411 upstream = uc
1412 } else {
1413 upstreamChannels = make(map[int64][]string)
1414 channels := strings.Split(msg.Params[0], ",")
1415 for _, channel := range channels {
1416 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1417 if err != nil {
1418 return err
1419 }
1420 upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
1421 }
1422 }
1423 }
1424
1425 dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
1426 dc.forEachUpstream(func(uc *upstreamConn) {
1427 if upstream != nil && upstream != uc {
1428 return
1429 }
1430 var params []string
1431 if upstreamChannels != nil {
1432 if channels, ok := upstreamChannels[uc.network.ID]; ok {
1433 params = []string{strings.Join(channels, ",")}
1434 } else {
1435 return
1436 }
1437 }
1438 pl.pendingCommands[uc.network.ID] = &irc.Message{
1439 Command: "LIST",
1440 Params: params,
1441 }
1442 uc.trySendLIST(dc.id)
1443 })
1444 case "NAMES":
1445 if len(msg.Params) == 0 {
1446 dc.SendMessage(&irc.Message{
1447 Prefix: dc.srv.prefix(),
1448 Command: irc.RPL_ENDOFNAMES,
1449 Params: []string{dc.nick, "*", "End of /NAMES list"},
1450 })
1451 return nil
1452 }
1453
1454 channels := strings.Split(msg.Params[0], ",")
1455 for _, channel := range channels {
1456 uc, upstreamChannel, err := dc.unmarshalEntity(channel)
1457 if err != nil {
1458 return err
1459 }
1460
1461 ch, ok := uc.channels[upstreamChannel]
1462 if ok {
1463 sendNames(dc, ch)
1464 } else {
1465 // NAMES on a channel we have not joined, ask upstream
1466 uc.SendMessageLabeled(dc.id, &irc.Message{
1467 Command: "NAMES",
1468 Params: []string{upstreamChannel},
1469 })
1470 }
1471 }
1472 case "WHO":
1473 if len(msg.Params) == 0 {
1474 // TODO: support WHO without parameters
1475 dc.SendMessage(&irc.Message{
1476 Prefix: dc.srv.prefix(),
1477 Command: irc.RPL_ENDOFWHO,
1478 Params: []string{dc.nick, "*", "End of /WHO list"},
1479 })
1480 return nil
1481 }
1482
1483 // TODO: support WHO masks
1484 entity := msg.Params[0]
1485
1486 if entity == dc.nick {
1487 // TODO: support AWAY (H/G) in self WHO reply
1488 dc.SendMessage(&irc.Message{
1489 Prefix: dc.srv.prefix(),
1490 Command: irc.RPL_WHOREPLY,
1491 Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
1492 })
1493 dc.SendMessage(&irc.Message{
1494 Prefix: dc.srv.prefix(),
1495 Command: irc.RPL_ENDOFWHO,
1496 Params: []string{dc.nick, dc.nick, "End of /WHO list"},
1497 })
1498 return nil
1499 }
1500 if entity == serviceNick {
1501 dc.SendMessage(&irc.Message{
1502 Prefix: dc.srv.prefix(),
1503 Command: irc.RPL_WHOREPLY,
1504 Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
1505 })
1506 dc.SendMessage(&irc.Message{
1507 Prefix: dc.srv.prefix(),
1508 Command: irc.RPL_ENDOFWHO,
1509 Params: []string{dc.nick, serviceNick, "End of /WHO list"},
1510 })
1511 return nil
1512 }
1513
1514 uc, upstreamName, err := dc.unmarshalEntity(entity)
1515 if err != nil {
1516 return err
1517 }
1518
1519 var params []string
1520 if len(msg.Params) == 2 {
1521 params = []string{upstreamName, msg.Params[1]}
1522 } else {
1523 params = []string{upstreamName}
1524 }
1525
1526 uc.SendMessageLabeled(dc.id, &irc.Message{
1527 Command: "WHO",
1528 Params: params,
1529 })
1530 case "WHOIS":
1531 if len(msg.Params) == 0 {
1532 return ircError{&irc.Message{
1533 Command: irc.ERR_NONICKNAMEGIVEN,
1534 Params: []string{dc.nick, "No nickname given"},
1535 }}
1536 }
1537
1538 var target, mask string
1539 if len(msg.Params) == 1 {
1540 target = ""
1541 mask = msg.Params[0]
1542 } else {
1543 target = msg.Params[0]
1544 mask = msg.Params[1]
1545 }
1546 // TODO: support multiple WHOIS users
1547 if i := strings.IndexByte(mask, ','); i >= 0 {
1548 mask = mask[:i]
1549 }
1550
1551 if mask == dc.nick {
1552 dc.SendMessage(&irc.Message{
1553 Prefix: dc.srv.prefix(),
1554 Command: irc.RPL_WHOISUSER,
1555 Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
1556 })
1557 dc.SendMessage(&irc.Message{
1558 Prefix: dc.srv.prefix(),
1559 Command: irc.RPL_WHOISSERVER,
1560 Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
1561 })
1562 dc.SendMessage(&irc.Message{
1563 Prefix: dc.srv.prefix(),
1564 Command: irc.RPL_ENDOFWHOIS,
1565 Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
1566 })
1567 return nil
1568 }
1569
1570 // TODO: support WHOIS masks
1571 uc, upstreamNick, err := dc.unmarshalEntity(mask)
1572 if err != nil {
1573 return err
1574 }
1575
1576 var params []string
1577 if target != "" {
1578 if target == mask { // WHOIS nick nick
1579 params = []string{upstreamNick, upstreamNick}
1580 } else {
1581 params = []string{target, upstreamNick}
1582 }
1583 } else {
1584 params = []string{upstreamNick}
1585 }
1586
1587 uc.SendMessageLabeled(dc.id, &irc.Message{
1588 Command: "WHOIS",
1589 Params: params,
1590 })
1591 case "PRIVMSG":
1592 var targetsStr, text string
1593 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1594 return err
1595 }
1596 tags := copyClientTags(msg.Tags)
1597
1598 for _, name := range strings.Split(targetsStr, ",") {
1599 if name == serviceNick {
1600 if dc.caps["echo-message"] {
1601 echoTags := tags.Copy()
1602 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1603 dc.SendMessage(&irc.Message{
1604 Tags: echoTags,
1605 Prefix: dc.prefix(),
1606 Command: "PRIVMSG",
1607 Params: []string{name, text},
1608 })
1609 }
1610 handleServicePRIVMSG(dc, text)
1611 continue
1612 }
1613
1614 uc, upstreamName, err := dc.unmarshalEntity(name)
1615 if err != nil {
1616 return err
1617 }
1618
1619 if upstreamName == "NickServ" {
1620 dc.handleNickServPRIVMSG(uc, text)
1621 }
1622
1623 unmarshaledText := text
1624 if uc.isChannel(upstreamName) {
1625 unmarshaledText = dc.unmarshalText(uc, text)
1626 }
1627 uc.SendMessageLabeled(dc.id, &irc.Message{
1628 Tags: tags,
1629 Command: "PRIVMSG",
1630 Params: []string{upstreamName, unmarshaledText},
1631 })
1632
1633 echoTags := tags.Copy()
1634 echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
1635 echoMsg := &irc.Message{
1636 Tags: echoTags,
1637 Prefix: &irc.Prefix{
1638 Name: uc.nick,
1639 User: uc.username,
1640 },
1641 Command: "PRIVMSG",
1642 Params: []string{upstreamName, text},
1643 }
1644 uc.produce(upstreamName, echoMsg, dc)
1645
1646 uc.updateChannelAutoDetach(upstreamName)
1647 }
1648 case "NOTICE":
1649 var targetsStr, text string
1650 if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
1651 return err
1652 }
1653 tags := copyClientTags(msg.Tags)
1654
1655 for _, name := range strings.Split(targetsStr, ",") {
1656 uc, upstreamName, err := dc.unmarshalEntity(name)
1657 if err != nil {
1658 return err
1659 }
1660
1661 unmarshaledText := text
1662 if uc.isChannel(upstreamName) {
1663 unmarshaledText = dc.unmarshalText(uc, text)
1664 }
1665 uc.SendMessageLabeled(dc.id, &irc.Message{
1666 Tags: tags,
1667 Command: "NOTICE",
1668 Params: []string{upstreamName, unmarshaledText},
1669 })
1670
1671 uc.updateChannelAutoDetach(upstreamName)
1672 }
1673 case "TAGMSG":
1674 var targetsStr string
1675 if err := parseMessageParams(msg, &targetsStr); err != nil {
1676 return err
1677 }
1678 tags := copyClientTags(msg.Tags)
1679
1680 for _, name := range strings.Split(targetsStr, ",") {
1681 uc, upstreamName, err := dc.unmarshalEntity(name)
1682 if err != nil {
1683 return err
1684 }
1685 if _, ok := uc.caps["message-tags"]; !ok {
1686 continue
1687 }
1688
1689 uc.SendMessageLabeled(dc.id, &irc.Message{
1690 Tags: tags,
1691 Command: "TAGMSG",
1692 Params: []string{upstreamName},
1693 })
1694
1695 uc.updateChannelAutoDetach(upstreamName)
1696 }
1697 case "INVITE":
1698 var user, channel string
1699 if err := parseMessageParams(msg, &user, &channel); err != nil {
1700 return err
1701 }
1702
1703 ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
1704 if err != nil {
1705 return err
1706 }
1707
1708 ucUser, upstreamUser, err := dc.unmarshalEntity(user)
1709 if err != nil {
1710 return err
1711 }
1712
1713 if ucChannel != ucUser {
1714 return ircError{&irc.Message{
1715 Command: irc.ERR_USERNOTINCHANNEL,
1716 Params: []string{dc.nick, user, channel, "They are on another network"},
1717 }}
1718 }
1719 uc := ucChannel
1720
1721 uc.SendMessageLabeled(dc.id, &irc.Message{
1722 Command: "INVITE",
1723 Params: []string{upstreamUser, upstreamChannel},
1724 })
1725 case "CHATHISTORY":
1726 var subcommand string
1727 if err := parseMessageParams(msg, &subcommand); err != nil {
1728 return err
1729 }
1730 var target, criteria, limitStr string
1731 if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
1732 return ircError{&irc.Message{
1733 Command: "FAIL",
1734 Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
1735 }}
1736 }
1737
1738 store, ok := dc.user.msgStore.(chatHistoryMessageStore)
1739 if !ok {
1740 return ircError{&irc.Message{
1741 Command: irc.ERR_UNKNOWNCOMMAND,
1742 Params: []string{dc.nick, subcommand, "Unknown command"},
1743 }}
1744 }
1745
1746 uc, entity, err := dc.unmarshalEntity(target)
1747 if err != nil {
1748 return err
1749 }
1750
1751 // TODO: support msgid criteria
1752 criteriaParts := strings.SplitN(criteria, "=", 2)
1753 if len(criteriaParts) != 2 || criteriaParts[0] != "timestamp" {
1754 return ircError{&irc.Message{
1755 Command: "FAIL",
1756 Params: []string{"CHATHISTORY", "UNKNOWN_CRITERIA", criteria, "Unknown criteria"},
1757 }}
1758 }
1759
1760 timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
1761 if err != nil {
1762 return ircError{&irc.Message{
1763 Command: "FAIL",
1764 Params: []string{"CHATHISTORY", "INVALID_CRITERIA", criteria, "Invalid criteria"},
1765 }}
1766 }
1767
1768 limit, err := strconv.Atoi(limitStr)
1769 if err != nil || limit < 0 || limit > dc.srv.HistoryLimit {
1770 return ircError{&irc.Message{
1771 Command: "FAIL",
1772 Params: []string{"CHATHISTORY", "INVALID_LIMIT", limitStr, "Invalid limit"},
1773 }}
1774 }
1775
1776 var history []*irc.Message
1777 switch subcommand {
1778 case "BEFORE":
1779 history, err = store.LoadBeforeTime(uc.network, entity, timestamp, limit)
1780 case "AFTER":
1781 history, err = store.LoadAfterTime(uc.network, entity, timestamp, limit)
1782 default:
1783 // TODO: support LATEST, BETWEEN
1784 return ircError{&irc.Message{
1785 Command: "FAIL",
1786 Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
1787 }}
1788 }
1789 if err != nil {
1790 dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
1791 return newChatHistoryError(subcommand, target)
1792 }
1793
1794 batchRef := "history"
1795 dc.SendMessage(&irc.Message{
1796 Prefix: dc.srv.prefix(),
1797 Command: "BATCH",
1798 Params: []string{"+" + batchRef, "chathistory", target},
1799 })
1800
1801 for _, msg := range history {
1802 msg.Tags["batch"] = irc.TagValue(batchRef)
1803 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1804 }
1805
1806 dc.SendMessage(&irc.Message{
1807 Prefix: dc.srv.prefix(),
1808 Command: "BATCH",
1809 Params: []string{"-" + batchRef},
1810 })
1811 default:
1812 dc.logger.Printf("unhandled message: %v", msg)
1813 return newUnknownCommandError(msg.Command)
1814 }
1815 return nil
1816}
1817
1818func (dc *downstreamConn) handleNickServPRIVMSG(uc *upstreamConn, text string) {
1819 username, password, ok := parseNickServCredentials(text, uc.nick)
1820 if !ok {
1821 return
1822 }
1823
1824 // User may have e.g. EXTERNAL mechanism configured. We do not want to
1825 // automatically erase the key pair or any other credentials.
1826 if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
1827 return
1828 }
1829
1830 dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
1831 n := uc.network
1832 n.SASL.Mechanism = "PLAIN"
1833 n.SASL.Plain.Username = username
1834 n.SASL.Plain.Password = password
1835 if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
1836 dc.logger.Printf("failed to save NickServ credentials: %v", err)
1837 }
1838}
1839
1840func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
1841 fields := strings.Fields(text)
1842 if len(fields) < 2 {
1843 return "", "", false
1844 }
1845 cmd := strings.ToUpper(fields[0])
1846 params := fields[1:]
1847 switch cmd {
1848 case "REGISTER":
1849 username = nick
1850 password = params[0]
1851 case "IDENTIFY":
1852 if len(params) == 1 {
1853 username = nick
1854 password = params[0]
1855 } else {
1856 username = params[0]
1857 password = params[1]
1858 }
1859 case "SET":
1860 if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
1861 username = nick
1862 password = params[1]
1863 }
1864 default:
1865 return "", "", false
1866 }
1867 return username, password, true
1868}
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