source: code/trunk/upstream.go@ 331

Last change on this file since 331 was 323, checked in by contact, 5 years ago

Add support for WebSocket connections

WebSocket connections allow web-based clients to connect to IRC. This
commit implements the WebSocket sub-protocol as specified by the pending
IRCv3 proposal [1].

WebSocket listeners can now be set up via a "wss" protocol in the
listen directive. The new http-origin directive allows the CORS
allowed origins to be configured.

[1]: ​https://github.com/ircv3/ircv3-specifications/pull/342
File size: 40.8 KB
Line 
1package soju
2
3import (
4 "crypto"
5 "crypto/sha256"
6 "crypto/tls"
7 "crypto/x509"
8 "encoding/base64"
9 "errors"
10 "fmt"
11 "io"
12 "net"
13 "strconv"
14 "strings"
15 "time"
16 "unicode"
17 "unicode/utf8"
18
19 "github.com/emersion/go-sasl"
20 "gopkg.in/irc.v3"
21)
22
23// permanentUpstreamCaps is the static list of upstream capabilities always
24// requested when supported.
25var permanentUpstreamCaps = map[string]bool{
26 "away-notify": true,
27 "batch": true,
28 "labeled-response": true,
29 "message-tags": true,
30 "multi-prefix": true,
31 "server-time": true,
32}
33
34type upstreamChannel struct {
35 Name string
36 conn *upstreamConn
37 Topic string
38 TopicWho string
39 TopicTime time.Time
40 Status channelStatus
41 modes channelModes
42 creationTime string
43 Members map[string]*memberships
44 complete bool
45}
46
47type upstreamConn struct {
48 conn
49
50 network *network
51 user *user
52
53 serverName string
54 availableUserModes string
55 availableChannelModes map[byte]channelModeType
56 availableChannelTypes string
57 availableMemberships []membership
58
59 registered bool
60 nick string
61 username string
62 realname string
63 modes userModes
64 channels map[string]*upstreamChannel
65 supportedCaps map[string]string
66 caps map[string]bool
67 batches map[string]batch
68 away bool
69 nextLabelID uint64
70
71 saslClient sasl.Client
72 saslStarted bool
73
74 // set of LIST commands in progress, per downstream
75 pendingLISTDownstreamSet map[uint64]struct{}
76
77 messageLoggers map[string]*messageLogger
78}
79
80func connectToUpstream(network *network) (*upstreamConn, error) {
81 logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
82
83 var scheme string
84 var addr string
85
86 addrParts := strings.SplitN(network.Addr, "://", 2)
87 if len(addrParts) == 2 {
88 scheme = addrParts[0]
89 addr = addrParts[1]
90 } else {
91 scheme = "ircs"
92 addr = addrParts[0]
93 }
94
95 dialer := net.Dialer{Timeout: connectTimeout}
96
97 var netConn net.Conn
98 var err error
99 switch scheme {
100 case "ircs":
101 if !strings.ContainsRune(addr, ':') {
102 addr = addr + ":6697"
103 }
104
105 logger.Printf("connecting to TLS server at address %q", addr)
106
107 var cfg *tls.Config
108 if network.SASL.Mechanism == "EXTERNAL" {
109 if network.SASL.External.CertBlob == nil {
110 return nil, fmt.Errorf("missing certificate for authentication")
111 }
112 if network.SASL.External.PrivKeyBlob == nil {
113 return nil, fmt.Errorf("missing private key for authentication")
114 }
115 key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
116 if err != nil {
117 return nil, fmt.Errorf("failed to parse private key: %v", err)
118 }
119 cfg = &tls.Config{
120 Certificates: []tls.Certificate{
121 {
122 Certificate: [][]byte{network.SASL.External.CertBlob},
123 PrivateKey: key.(crypto.PrivateKey),
124 },
125 },
126 }
127 logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
128 }
129
130 netConn, err = tls.DialWithDialer(&dialer, "tcp", addr, cfg)
131 case "irc+insecure":
132 if !strings.ContainsRune(addr, ':') {
133 addr = addr + ":6667"
134 }
135
136 logger.Printf("connecting to plain-text server at address %q", addr)
137 netConn, err = dialer.Dial("tcp", addr)
138 default:
139 return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", addr, scheme)
140 }
141 if err != nil {
142 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
143 }
144
145 uc := &upstreamConn{
146 conn: *newConn(network.user.srv, newNetIRCConn(netConn), logger),
147 network: network,
148 user: network.user,
149 channels: make(map[string]*upstreamChannel),
150 supportedCaps: make(map[string]string),
151 caps: make(map[string]bool),
152 batches: make(map[string]batch),
153 availableChannelTypes: stdChannelTypes,
154 availableChannelModes: stdChannelModes,
155 availableMemberships: stdMemberships,
156 pendingLISTDownstreamSet: make(map[uint64]struct{}),
157 messageLoggers: make(map[string]*messageLogger),
158 }
159
160 return uc, nil
161}
162
163func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
164 uc.network.forEachDownstream(f)
165}
166
167func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
168 uc.forEachDownstream(func(dc *downstreamConn) {
169 if id != 0 && id != dc.id {
170 return
171 }
172 f(dc)
173 })
174}
175
176func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
177 ch, ok := uc.channels[name]
178 if !ok {
179 return nil, fmt.Errorf("unknown channel %q", name)
180 }
181 return ch, nil
182}
183
184func (uc *upstreamConn) isChannel(entity string) bool {
185 if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
186 return true
187 }
188 return false
189}
190
191func (uc *upstreamConn) getPendingLIST() *pendingLIST {
192 for _, pl := range uc.user.pendingLISTs {
193 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
194 continue
195 }
196 return &pl
197 }
198 return nil
199}
200
201func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
202 found = false
203 for i := 0; i < len(uc.user.pendingLISTs); i++ {
204 pl := uc.user.pendingLISTs[i]
205 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
206 continue
207 }
208 delete(pl.pendingCommands, uc.network.ID)
209 if len(pl.pendingCommands) == 0 {
210 uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
211 i--
212 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
213 dc.SendMessage(&irc.Message{
214 Prefix: dc.srv.prefix(),
215 Command: irc.RPL_LISTEND,
216 Params: []string{dc.nick, "End of /LIST"},
217 })
218 })
219 }
220 found = true
221 if !all {
222 delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
223 uc.user.forEachUpstream(func(uc *upstreamConn) {
224 uc.trySendLIST(pl.downstreamID)
225 })
226 return
227 }
228 }
229 return
230}
231
232func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
233 if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
234 // a LIST command is already pending
235 // we will try again when that command is completed
236 return
237 }
238
239 for _, pl := range uc.user.pendingLISTs {
240 if pl.downstreamID != downstreamID {
241 continue
242 }
243 // this is the first pending LIST command list of the downstream
244 listCommand, ok := pl.pendingCommands[uc.network.ID]
245 if !ok {
246 // there is no command for this upstream in these LIST commands
247 // do not send anything
248 continue
249 }
250 // there is a command for this upstream in these LIST commands
251 // send it now
252
253 uc.SendMessageLabeled(downstreamID, listCommand)
254
255 uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
256 return
257 }
258}
259
260func (uc *upstreamConn) parseMembershipPrefix(s string) (ms *memberships, nick string) {
261 memberships := make(memberships, 0, 4)
262 i := 0
263 for _, m := range uc.availableMemberships {
264 if i >= len(s) {
265 break
266 }
267 if s[i] == m.Prefix {
268 memberships = append(memberships, m)
269 i++
270 }
271 }
272 return &memberships, s[i:]
273}
274
275func isWordBoundary(r rune) bool {
276 switch r {
277 case '-', '_', '|':
278 return false
279 case '\u00A0':
280 return true
281 default:
282 return !unicode.IsLetter(r) && !unicode.IsNumber(r)
283 }
284}
285
286func isHighlight(text, nick string) bool {
287 for {
288 i := strings.Index(text, nick)
289 if i < 0 {
290 return false
291 }
292
293 // Detect word boundaries
294 var left, right rune
295 if i > 0 {
296 left, _ = utf8.DecodeLastRuneInString(text[:i])
297 }
298 if i < len(text) {
299 right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
300 }
301 if isWordBoundary(left) && isWordBoundary(right) {
302 return true
303 }
304
305 text = text[i+len(nick):]
306 }
307}
308
309func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
310 var label string
311 if l, ok := msg.GetTag("label"); ok {
312 label = l
313 }
314
315 var msgBatch *batch
316 if batchName, ok := msg.GetTag("batch"); ok {
317 b, ok := uc.batches[batchName]
318 if !ok {
319 return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
320 }
321 msgBatch = &b
322 if label == "" {
323 label = msgBatch.Label
324 }
325 }
326
327 var downstreamID uint64 = 0
328 if label != "" {
329 var labelOffset uint64
330 n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
331 if err == nil && n < 2 {
332 err = errors.New("not enough arguments")
333 }
334 if err != nil {
335 return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
336 }
337 }
338
339 if _, ok := msg.Tags["time"]; !ok {
340 msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
341 }
342
343 switch msg.Command {
344 case "PING":
345 uc.SendMessage(&irc.Message{
346 Command: "PONG",
347 Params: msg.Params,
348 })
349 return nil
350 case "NOTICE", "PRIVMSG", "TAGMSG":
351 if msg.Prefix == nil {
352 return fmt.Errorf("expected a prefix")
353 }
354
355 var entity, text string
356 if msg.Command != "TAGMSG" {
357 if err := parseMessageParams(msg, &entity, &text); err != nil {
358 return err
359 }
360 } else {
361 if err := parseMessageParams(msg, &entity); err != nil {
362 return err
363 }
364 }
365
366 if msg.Prefix.Name == serviceNick {
367 uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
368 break
369 }
370 if entity == serviceNick {
371 uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
372 break
373 }
374
375 if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
376 uc.produce("", msg, nil)
377 } else { // regular user message
378 target := entity
379 if target == uc.nick {
380 target = msg.Prefix.Name
381 }
382 uc.produce(target, msg, nil)
383
384 highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
385 if ch, ok := uc.network.channels[target]; ok && ch.Detached && highlight {
386 uc.forEachDownstream(func(dc *downstreamConn) {
387 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), msg.Prefix.Name, text))
388 })
389 }
390 }
391 case "CAP":
392 var subCmd string
393 if err := parseMessageParams(msg, nil, &subCmd); err != nil {
394 return err
395 }
396 subCmd = strings.ToUpper(subCmd)
397 subParams := msg.Params[2:]
398 switch subCmd {
399 case "LS":
400 if len(subParams) < 1 {
401 return newNeedMoreParamsError(msg.Command)
402 }
403 caps := subParams[len(subParams)-1]
404 more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
405
406 uc.handleSupportedCaps(caps)
407
408 if more {
409 break // wait to receive all capabilities
410 }
411
412 uc.requestCaps()
413
414 if uc.requestSASL() {
415 break // we'll send CAP END after authentication is completed
416 }
417
418 uc.SendMessage(&irc.Message{
419 Command: "CAP",
420 Params: []string{"END"},
421 })
422 case "ACK", "NAK":
423 if len(subParams) < 1 {
424 return newNeedMoreParamsError(msg.Command)
425 }
426 caps := strings.Fields(subParams[0])
427
428 for _, name := range caps {
429 if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
430 return err
431 }
432 }
433
434 if uc.registered {
435 uc.forEachDownstream(func(dc *downstreamConn) {
436 dc.updateSupportedCaps()
437 })
438 }
439 case "NEW":
440 if len(subParams) < 1 {
441 return newNeedMoreParamsError(msg.Command)
442 }
443 uc.handleSupportedCaps(subParams[0])
444 uc.requestCaps()
445 case "DEL":
446 if len(subParams) < 1 {
447 return newNeedMoreParamsError(msg.Command)
448 }
449 caps := strings.Fields(subParams[0])
450
451 for _, c := range caps {
452 delete(uc.supportedCaps, c)
453 delete(uc.caps, c)
454 }
455
456 if uc.registered {
457 uc.forEachDownstream(func(dc *downstreamConn) {
458 dc.updateSupportedCaps()
459 })
460 }
461 default:
462 uc.logger.Printf("unhandled message: %v", msg)
463 }
464 case "AUTHENTICATE":
465 if uc.saslClient == nil {
466 return fmt.Errorf("received unexpected AUTHENTICATE message")
467 }
468
469 // TODO: if a challenge is 400 bytes long, buffer it
470 var challengeStr string
471 if err := parseMessageParams(msg, &challengeStr); err != nil {
472 uc.SendMessage(&irc.Message{
473 Command: "AUTHENTICATE",
474 Params: []string{"*"},
475 })
476 return err
477 }
478
479 var challenge []byte
480 if challengeStr != "+" {
481 var err error
482 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
483 if err != nil {
484 uc.SendMessage(&irc.Message{
485 Command: "AUTHENTICATE",
486 Params: []string{"*"},
487 })
488 return err
489 }
490 }
491
492 var resp []byte
493 var err error
494 if !uc.saslStarted {
495 _, resp, err = uc.saslClient.Start()
496 uc.saslStarted = true
497 } else {
498 resp, err = uc.saslClient.Next(challenge)
499 }
500 if err != nil {
501 uc.SendMessage(&irc.Message{
502 Command: "AUTHENTICATE",
503 Params: []string{"*"},
504 })
505 return err
506 }
507
508 // TODO: send response in multiple chunks if >= 400 bytes
509 var respStr = "+"
510 if len(resp) != 0 {
511 respStr = base64.StdEncoding.EncodeToString(resp)
512 }
513
514 uc.SendMessage(&irc.Message{
515 Command: "AUTHENTICATE",
516 Params: []string{respStr},
517 })
518 case irc.RPL_LOGGEDIN:
519 var account string
520 if err := parseMessageParams(msg, nil, nil, &account); err != nil {
521 return err
522 }
523 uc.logger.Printf("logged in with account %q", account)
524 case irc.RPL_LOGGEDOUT:
525 uc.logger.Printf("logged out")
526 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
527 var info string
528 if err := parseMessageParams(msg, nil, &info); err != nil {
529 return err
530 }
531 switch msg.Command {
532 case irc.ERR_NICKLOCKED:
533 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
534 case irc.ERR_SASLFAIL:
535 uc.logger.Printf("SASL authentication failed: %v", info)
536 case irc.ERR_SASLTOOLONG:
537 uc.logger.Printf("SASL message too long: %v", info)
538 }
539
540 uc.saslClient = nil
541 uc.saslStarted = false
542
543 uc.SendMessage(&irc.Message{
544 Command: "CAP",
545 Params: []string{"END"},
546 })
547 case irc.RPL_WELCOME:
548 uc.registered = true
549 uc.logger.Printf("connection registered")
550
551 uc.forEachDownstream(func(dc *downstreamConn) {
552 dc.updateSupportedCaps()
553 })
554
555 if len(uc.network.channels) > 0 {
556 // TODO: split this into multiple messages if need be
557 var names, keys []string
558 for _, ch := range uc.network.channels {
559 names = append(names, ch.Name)
560 keys = append(keys, ch.Key)
561 }
562 uc.SendMessage(&irc.Message{
563 Command: "JOIN",
564 Params: []string{
565 strings.Join(names, ","),
566 strings.Join(keys, ","),
567 },
568 })
569 }
570 case irc.RPL_MYINFO:
571 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
572 return err
573 }
574 case irc.RPL_ISUPPORT:
575 if err := parseMessageParams(msg, nil, nil); err != nil {
576 return err
577 }
578 for _, token := range msg.Params[1 : len(msg.Params)-1] {
579 negate := false
580 parameter := token
581 value := ""
582 if strings.HasPrefix(token, "-") {
583 negate = true
584 token = token[1:]
585 } else {
586 if i := strings.IndexByte(token, '='); i >= 0 {
587 parameter = token[:i]
588 value = token[i+1:]
589 }
590 }
591 if !negate {
592 switch parameter {
593 case "CHANMODES":
594 parts := strings.SplitN(value, ",", 5)
595 if len(parts) < 4 {
596 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
597 }
598 modes := make(map[byte]channelModeType)
599 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
600 for j := 0; j < len(parts[i]); j++ {
601 mode := parts[i][j]
602 modes[mode] = mt
603 }
604 }
605 uc.availableChannelModes = modes
606 case "CHANTYPES":
607 uc.availableChannelTypes = value
608 case "PREFIX":
609 if value == "" {
610 uc.availableMemberships = nil
611 } else {
612 if value[0] != '(' {
613 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
614 }
615 sep := strings.IndexByte(value, ')')
616 if sep < 0 || len(value) != sep*2 {
617 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
618 }
619 memberships := make([]membership, len(value)/2-1)
620 for i := range memberships {
621 memberships[i] = membership{
622 Mode: value[i+1],
623 Prefix: value[sep+i+1],
624 }
625 }
626 uc.availableMemberships = memberships
627 }
628 }
629 } else {
630 // TODO: handle ISUPPORT negations
631 }
632 }
633 case "BATCH":
634 var tag string
635 if err := parseMessageParams(msg, &tag); err != nil {
636 return err
637 }
638
639 if strings.HasPrefix(tag, "+") {
640 tag = tag[1:]
641 if _, ok := uc.batches[tag]; ok {
642 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
643 }
644 var batchType string
645 if err := parseMessageParams(msg, nil, &batchType); err != nil {
646 return err
647 }
648 label := label
649 if label == "" && msgBatch != nil {
650 label = msgBatch.Label
651 }
652 uc.batches[tag] = batch{
653 Type: batchType,
654 Params: msg.Params[2:],
655 Outer: msgBatch,
656 Label: label,
657 }
658 } else if strings.HasPrefix(tag, "-") {
659 tag = tag[1:]
660 if _, ok := uc.batches[tag]; !ok {
661 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
662 }
663 delete(uc.batches, tag)
664 } else {
665 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
666 }
667 case "NICK":
668 if msg.Prefix == nil {
669 return fmt.Errorf("expected a prefix")
670 }
671
672 var newNick string
673 if err := parseMessageParams(msg, &newNick); err != nil {
674 return err
675 }
676
677 me := false
678 if msg.Prefix.Name == uc.nick {
679 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
680 me = true
681 uc.nick = newNick
682 }
683
684 for _, ch := range uc.channels {
685 if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
686 delete(ch.Members, msg.Prefix.Name)
687 ch.Members[newNick] = memberships
688 uc.appendLog(ch.Name, msg)
689 uc.appendHistory(ch.Name, msg)
690 }
691 }
692
693 if !me {
694 uc.forEachDownstream(func(dc *downstreamConn) {
695 dc.SendMessage(dc.marshalMessage(msg, uc.network))
696 })
697 } else {
698 uc.forEachDownstream(func(dc *downstreamConn) {
699 dc.updateNick()
700 })
701 }
702 case "JOIN":
703 if msg.Prefix == nil {
704 return fmt.Errorf("expected a prefix")
705 }
706
707 var channels string
708 if err := parseMessageParams(msg, &channels); err != nil {
709 return err
710 }
711
712 for _, ch := range strings.Split(channels, ",") {
713 if msg.Prefix.Name == uc.nick {
714 uc.logger.Printf("joined channel %q", ch)
715 uc.channels[ch] = &upstreamChannel{
716 Name: ch,
717 conn: uc,
718 Members: make(map[string]*memberships),
719 }
720
721 uc.SendMessage(&irc.Message{
722 Command: "MODE",
723 Params: []string{ch},
724 })
725 } else {
726 ch, err := uc.getChannel(ch)
727 if err != nil {
728 return err
729 }
730 ch.Members[msg.Prefix.Name] = &memberships{}
731 }
732
733 chMsg := msg.Copy()
734 chMsg.Params[0] = ch
735 uc.produce(ch, chMsg, nil)
736 }
737 case "PART":
738 if msg.Prefix == nil {
739 return fmt.Errorf("expected a prefix")
740 }
741
742 var channels string
743 if err := parseMessageParams(msg, &channels); err != nil {
744 return err
745 }
746
747 for _, ch := range strings.Split(channels, ",") {
748 if msg.Prefix.Name == uc.nick {
749 uc.logger.Printf("parted channel %q", ch)
750 delete(uc.channels, ch)
751 } else {
752 ch, err := uc.getChannel(ch)
753 if err != nil {
754 return err
755 }
756 delete(ch.Members, msg.Prefix.Name)
757 }
758
759 chMsg := msg.Copy()
760 chMsg.Params[0] = ch
761 uc.produce(ch, chMsg, nil)
762 }
763 case "KICK":
764 if msg.Prefix == nil {
765 return fmt.Errorf("expected a prefix")
766 }
767
768 var channel, user string
769 if err := parseMessageParams(msg, &channel, &user); err != nil {
770 return err
771 }
772
773 if user == uc.nick {
774 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
775 delete(uc.channels, channel)
776 } else {
777 ch, err := uc.getChannel(channel)
778 if err != nil {
779 return err
780 }
781 delete(ch.Members, user)
782 }
783
784 uc.produce(channel, msg, nil)
785 case "QUIT":
786 if msg.Prefix == nil {
787 return fmt.Errorf("expected a prefix")
788 }
789
790 if msg.Prefix.Name == uc.nick {
791 uc.logger.Printf("quit")
792 }
793
794 for _, ch := range uc.channels {
795 if _, ok := ch.Members[msg.Prefix.Name]; ok {
796 delete(ch.Members, msg.Prefix.Name)
797
798 uc.appendLog(ch.Name, msg)
799 uc.appendHistory(ch.Name, msg)
800 }
801 }
802
803 if msg.Prefix.Name != uc.nick {
804 uc.forEachDownstream(func(dc *downstreamConn) {
805 dc.SendMessage(dc.marshalMessage(msg, uc.network))
806 })
807 }
808 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
809 var name, topic string
810 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
811 return err
812 }
813 ch, err := uc.getChannel(name)
814 if err != nil {
815 return err
816 }
817 if msg.Command == irc.RPL_TOPIC {
818 ch.Topic = topic
819 } else {
820 ch.Topic = ""
821 }
822 case "TOPIC":
823 var name string
824 if err := parseMessageParams(msg, &name); err != nil {
825 return err
826 }
827 ch, err := uc.getChannel(name)
828 if err != nil {
829 return err
830 }
831 if len(msg.Params) > 1 {
832 ch.Topic = msg.Params[1]
833 } else {
834 ch.Topic = ""
835 }
836 uc.produce(ch.Name, msg, nil)
837 case "MODE":
838 var name, modeStr string
839 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
840 return err
841 }
842
843 if !uc.isChannel(name) { // user mode change
844 if name != uc.nick {
845 return fmt.Errorf("received MODE message for unknown nick %q", name)
846 }
847 return uc.modes.Apply(modeStr)
848 // TODO: notify downstreams about user mode change?
849 } else { // channel mode change
850 ch, err := uc.getChannel(name)
851 if err != nil {
852 return err
853 }
854
855 needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
856 if err != nil {
857 return err
858 }
859
860 uc.appendLog(ch.Name, msg)
861 uc.forEachDownstream(func(dc *downstreamConn) {
862 params := make([]string, len(msg.Params))
863 params[0] = dc.marshalEntity(uc.network, name)
864 params[1] = modeStr
865
866 copy(params[2:], msg.Params[2:])
867 for i, modeParam := range params[2:] {
868 if _, ok := needMarshaling[i]; ok {
869 params[2+i] = dc.marshalEntity(uc.network, modeParam)
870 }
871 }
872
873 dc.SendMessage(&irc.Message{
874 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
875 Command: "MODE",
876 Params: params,
877 })
878 })
879 }
880 case irc.RPL_UMODEIS:
881 if err := parseMessageParams(msg, nil); err != nil {
882 return err
883 }
884 modeStr := ""
885 if len(msg.Params) > 1 {
886 modeStr = msg.Params[1]
887 }
888
889 uc.modes = ""
890 if err := uc.modes.Apply(modeStr); err != nil {
891 return err
892 }
893 // TODO: send RPL_UMODEIS to downstream connections when applicable
894 case irc.RPL_CHANNELMODEIS:
895 var channel string
896 if err := parseMessageParams(msg, nil, &channel); err != nil {
897 return err
898 }
899 modeStr := ""
900 if len(msg.Params) > 2 {
901 modeStr = msg.Params[2]
902 }
903
904 ch, err := uc.getChannel(channel)
905 if err != nil {
906 return err
907 }
908
909 firstMode := ch.modes == nil
910 ch.modes = make(map[byte]string)
911 if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
912 return err
913 }
914 if firstMode {
915 modeStr, modeParams := ch.modes.Format()
916
917 uc.forEachDownstream(func(dc *downstreamConn) {
918 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
919 params = append(params, modeParams...)
920
921 dc.SendMessage(&irc.Message{
922 Prefix: dc.srv.prefix(),
923 Command: irc.RPL_CHANNELMODEIS,
924 Params: params,
925 })
926 })
927 }
928 case rpl_creationtime:
929 var channel, creationTime string
930 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
931 return err
932 }
933
934 ch, err := uc.getChannel(channel)
935 if err != nil {
936 return err
937 }
938
939 firstCreationTime := ch.creationTime == ""
940 ch.creationTime = creationTime
941 if firstCreationTime {
942 uc.forEachDownstream(func(dc *downstreamConn) {
943 dc.SendMessage(&irc.Message{
944 Prefix: dc.srv.prefix(),
945 Command: rpl_creationtime,
946 Params: []string{dc.nick, channel, creationTime},
947 })
948 })
949 }
950 case rpl_topicwhotime:
951 var name, who, timeStr string
952 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
953 return err
954 }
955 ch, err := uc.getChannel(name)
956 if err != nil {
957 return err
958 }
959 ch.TopicWho = who
960 sec, err := strconv.ParseInt(timeStr, 10, 64)
961 if err != nil {
962 return fmt.Errorf("failed to parse topic time: %v", err)
963 }
964 ch.TopicTime = time.Unix(sec, 0)
965 case irc.RPL_LIST:
966 var channel, clients, topic string
967 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
968 return err
969 }
970
971 pl := uc.getPendingLIST()
972 if pl == nil {
973 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
974 }
975
976 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
977 dc.SendMessage(&irc.Message{
978 Prefix: dc.srv.prefix(),
979 Command: irc.RPL_LIST,
980 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
981 })
982 })
983 case irc.RPL_LISTEND:
984 ok := uc.endPendingLISTs(false)
985 if !ok {
986 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
987 }
988 case irc.RPL_NAMREPLY:
989 var name, statusStr, members string
990 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
991 return err
992 }
993
994 ch, ok := uc.channels[name]
995 if !ok {
996 // NAMES on a channel we have not joined, forward to downstream
997 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
998 channel := dc.marshalEntity(uc.network, name)
999 members := splitSpace(members)
1000 for i, member := range members {
1001 memberships, nick := uc.parseMembershipPrefix(member)
1002 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
1003 }
1004 memberStr := strings.Join(members, " ")
1005
1006 dc.SendMessage(&irc.Message{
1007 Prefix: dc.srv.prefix(),
1008 Command: irc.RPL_NAMREPLY,
1009 Params: []string{dc.nick, statusStr, channel, memberStr},
1010 })
1011 })
1012 return nil
1013 }
1014
1015 status, err := parseChannelStatus(statusStr)
1016 if err != nil {
1017 return err
1018 }
1019 ch.Status = status
1020
1021 for _, s := range splitSpace(members) {
1022 memberships, nick := uc.parseMembershipPrefix(s)
1023 ch.Members[nick] = memberships
1024 }
1025 case irc.RPL_ENDOFNAMES:
1026 var name string
1027 if err := parseMessageParams(msg, nil, &name); err != nil {
1028 return err
1029 }
1030
1031 ch, ok := uc.channels[name]
1032 if !ok {
1033 // NAMES on a channel we have not joined, forward to downstream
1034 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1035 channel := dc.marshalEntity(uc.network, name)
1036
1037 dc.SendMessage(&irc.Message{
1038 Prefix: dc.srv.prefix(),
1039 Command: irc.RPL_ENDOFNAMES,
1040 Params: []string{dc.nick, channel, "End of /NAMES list"},
1041 })
1042 })
1043 return nil
1044 }
1045
1046 if ch.complete {
1047 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
1048 }
1049 ch.complete = true
1050
1051 uc.forEachDownstream(func(dc *downstreamConn) {
1052 forwardChannel(dc, ch)
1053 })
1054 case irc.RPL_WHOREPLY:
1055 var channel, username, host, server, nick, mode, trailing string
1056 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1057 return err
1058 }
1059
1060 parts := strings.SplitN(trailing, " ", 2)
1061 if len(parts) != 2 {
1062 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1063 }
1064 realname := parts[1]
1065 hops, err := strconv.Atoi(parts[0])
1066 if err != nil {
1067 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1068 }
1069 hops++
1070
1071 trailing = strconv.Itoa(hops) + " " + realname
1072
1073 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1074 channel := channel
1075 if channel != "*" {
1076 channel = dc.marshalEntity(uc.network, channel)
1077 }
1078 nick := dc.marshalEntity(uc.network, nick)
1079 dc.SendMessage(&irc.Message{
1080 Prefix: dc.srv.prefix(),
1081 Command: irc.RPL_WHOREPLY,
1082 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1083 })
1084 })
1085 case irc.RPL_ENDOFWHO:
1086 var name string
1087 if err := parseMessageParams(msg, nil, &name); err != nil {
1088 return err
1089 }
1090
1091 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1092 name := name
1093 if name != "*" {
1094 // TODO: support WHO masks
1095 name = dc.marshalEntity(uc.network, name)
1096 }
1097 dc.SendMessage(&irc.Message{
1098 Prefix: dc.srv.prefix(),
1099 Command: irc.RPL_ENDOFWHO,
1100 Params: []string{dc.nick, name, "End of /WHO list"},
1101 })
1102 })
1103 case irc.RPL_WHOISUSER:
1104 var nick, username, host, realname string
1105 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1106 return err
1107 }
1108
1109 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1110 nick := dc.marshalEntity(uc.network, nick)
1111 dc.SendMessage(&irc.Message{
1112 Prefix: dc.srv.prefix(),
1113 Command: irc.RPL_WHOISUSER,
1114 Params: []string{dc.nick, nick, username, host, "*", realname},
1115 })
1116 })
1117 case irc.RPL_WHOISSERVER:
1118 var nick, server, serverInfo string
1119 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1120 return err
1121 }
1122
1123 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1124 nick := dc.marshalEntity(uc.network, nick)
1125 dc.SendMessage(&irc.Message{
1126 Prefix: dc.srv.prefix(),
1127 Command: irc.RPL_WHOISSERVER,
1128 Params: []string{dc.nick, nick, server, serverInfo},
1129 })
1130 })
1131 case irc.RPL_WHOISOPERATOR:
1132 var nick string
1133 if err := parseMessageParams(msg, nil, &nick); err != nil {
1134 return err
1135 }
1136
1137 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1138 nick := dc.marshalEntity(uc.network, nick)
1139 dc.SendMessage(&irc.Message{
1140 Prefix: dc.srv.prefix(),
1141 Command: irc.RPL_WHOISOPERATOR,
1142 Params: []string{dc.nick, nick, "is an IRC operator"},
1143 })
1144 })
1145 case irc.RPL_WHOISIDLE:
1146 var nick string
1147 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1148 return err
1149 }
1150
1151 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1152 nick := dc.marshalEntity(uc.network, nick)
1153 params := []string{dc.nick, nick}
1154 params = append(params, msg.Params[2:]...)
1155 dc.SendMessage(&irc.Message{
1156 Prefix: dc.srv.prefix(),
1157 Command: irc.RPL_WHOISIDLE,
1158 Params: params,
1159 })
1160 })
1161 case irc.RPL_WHOISCHANNELS:
1162 var nick, channelList string
1163 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1164 return err
1165 }
1166 channels := splitSpace(channelList)
1167
1168 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1169 nick := dc.marshalEntity(uc.network, nick)
1170 channelList := make([]string, len(channels))
1171 for i, channel := range channels {
1172 prefix, channel := uc.parseMembershipPrefix(channel)
1173 channel = dc.marshalEntity(uc.network, channel)
1174 channelList[i] = prefix.Format(dc) + channel
1175 }
1176 channels := strings.Join(channelList, " ")
1177 dc.SendMessage(&irc.Message{
1178 Prefix: dc.srv.prefix(),
1179 Command: irc.RPL_WHOISCHANNELS,
1180 Params: []string{dc.nick, nick, channels},
1181 })
1182 })
1183 case irc.RPL_ENDOFWHOIS:
1184 var nick string
1185 if err := parseMessageParams(msg, nil, &nick); err != nil {
1186 return err
1187 }
1188
1189 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1190 nick := dc.marshalEntity(uc.network, nick)
1191 dc.SendMessage(&irc.Message{
1192 Prefix: dc.srv.prefix(),
1193 Command: irc.RPL_ENDOFWHOIS,
1194 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1195 })
1196 })
1197 case "INVITE":
1198 var nick, channel string
1199 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1200 return err
1201 }
1202
1203 uc.forEachDownstream(func(dc *downstreamConn) {
1204 dc.SendMessage(&irc.Message{
1205 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1206 Command: "INVITE",
1207 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1208 })
1209 })
1210 case irc.RPL_INVITING:
1211 var nick, channel string
1212 if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
1213 return err
1214 }
1215
1216 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1217 dc.SendMessage(&irc.Message{
1218 Prefix: dc.srv.prefix(),
1219 Command: irc.RPL_INVITING,
1220 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1221 })
1222 })
1223 case irc.RPL_AWAY:
1224 var nick, reason string
1225 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1226 return err
1227 }
1228
1229 uc.forEachDownstream(func(dc *downstreamConn) {
1230 dc.SendMessage(&irc.Message{
1231 Prefix: dc.srv.prefix(),
1232 Command: irc.RPL_AWAY,
1233 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1234 })
1235 })
1236 case "AWAY":
1237 if msg.Prefix == nil {
1238 return fmt.Errorf("expected a prefix")
1239 }
1240
1241 uc.forEachDownstream(func(dc *downstreamConn) {
1242 if !dc.caps["away-notify"] {
1243 return
1244 }
1245 dc.SendMessage(&irc.Message{
1246 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1247 Command: "AWAY",
1248 Params: msg.Params,
1249 })
1250 })
1251 case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
1252 var channel, mask string
1253 if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
1254 return err
1255 }
1256 var addNick, addTime string
1257 if len(msg.Params) >= 5 {
1258 addNick = msg.Params[3]
1259 addTime = msg.Params[4]
1260 }
1261
1262 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1263 channel := dc.marshalEntity(uc.network, channel)
1264
1265 var params []string
1266 if addNick != "" && addTime != "" {
1267 addNick := dc.marshalEntity(uc.network, addNick)
1268 params = []string{dc.nick, channel, mask, addNick, addTime}
1269 } else {
1270 params = []string{dc.nick, channel, mask}
1271 }
1272
1273 dc.SendMessage(&irc.Message{
1274 Prefix: dc.srv.prefix(),
1275 Command: msg.Command,
1276 Params: params,
1277 })
1278 })
1279 case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
1280 var channel, trailing string
1281 if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
1282 return err
1283 }
1284
1285 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1286 upstreamChannel := dc.marshalEntity(uc.network, channel)
1287 dc.SendMessage(&irc.Message{
1288 Prefix: dc.srv.prefix(),
1289 Command: msg.Command,
1290 Params: []string{dc.nick, upstreamChannel, trailing},
1291 })
1292 })
1293 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1294 var command, reason string
1295 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1296 return err
1297 }
1298
1299 if command == "LIST" {
1300 ok := uc.endPendingLISTs(false)
1301 if !ok {
1302 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1303 }
1304 }
1305
1306 if downstreamID != 0 {
1307 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1308 dc.SendMessage(&irc.Message{
1309 Prefix: uc.srv.prefix(),
1310 Command: msg.Command,
1311 Params: []string{dc.nick, command, reason},
1312 })
1313 })
1314 }
1315 case "ACK":
1316 // Ignore
1317 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1318 // Ignore
1319 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1320 // Ignore
1321 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1322 // Ignore
1323 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
1324 // Ignore
1325 case irc.RPL_LISTSTART:
1326 // Ignore
1327 case rpl_localusers, rpl_globalusers:
1328 // Ignore
1329 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1330 // Ignore
1331 default:
1332 uc.logger.Printf("unhandled message: %v", msg)
1333 if downstreamID != 0 {
1334 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1335 // best effort marshaling for unknown messages, replies and errors:
1336 // most numerics start with the user nick, marshal it if that's the case
1337 // otherwise, conservately keep the params without marshaling
1338 params := msg.Params
1339 if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
1340 if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
1341 params[0] = dc.nick
1342 }
1343 }
1344 dc.SendMessage(&irc.Message{
1345 Prefix: uc.srv.prefix(),
1346 Command: msg.Command,
1347 Params: params,
1348 })
1349 })
1350 }
1351 }
1352 return nil
1353}
1354
1355func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1356 caps := strings.Fields(capsStr)
1357 for _, s := range caps {
1358 kv := strings.SplitN(s, "=", 2)
1359 k := strings.ToLower(kv[0])
1360 var v string
1361 if len(kv) == 2 {
1362 v = kv[1]
1363 }
1364 uc.supportedCaps[k] = v
1365 }
1366}
1367
1368func (uc *upstreamConn) requestCaps() {
1369 var requestCaps []string
1370 for c := range permanentUpstreamCaps {
1371 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1372 requestCaps = append(requestCaps, c)
1373 }
1374 }
1375
1376 if uc.requestSASL() && !uc.caps["sasl"] {
1377 requestCaps = append(requestCaps, "sasl")
1378 }
1379
1380 if len(requestCaps) == 0 {
1381 return
1382 }
1383
1384 uc.SendMessage(&irc.Message{
1385 Command: "CAP",
1386 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1387 })
1388}
1389
1390func (uc *upstreamConn) requestSASL() bool {
1391 if uc.network.SASL.Mechanism == "" {
1392 return false
1393 }
1394
1395 v, ok := uc.supportedCaps["sasl"]
1396 if !ok {
1397 return false
1398 }
1399 if v != "" {
1400 mechanisms := strings.Split(v, ",")
1401 found := false
1402 for _, mech := range mechanisms {
1403 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1404 found = true
1405 break
1406 }
1407 }
1408 if !found {
1409 return false
1410 }
1411 }
1412
1413 return true
1414}
1415
1416func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1417 uc.caps[name] = ok
1418
1419 switch name {
1420 case "sasl":
1421 if !ok {
1422 uc.logger.Printf("server refused to acknowledge the SASL capability")
1423 return nil
1424 }
1425
1426 auth := &uc.network.SASL
1427 switch auth.Mechanism {
1428 case "PLAIN":
1429 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1430 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1431 case "EXTERNAL":
1432 uc.logger.Printf("starting SASL EXTERNAL authentication")
1433 uc.saslClient = sasl.NewExternalClient("")
1434 default:
1435 return fmt.Errorf("unsupported SASL mechanism %q", name)
1436 }
1437
1438 uc.SendMessage(&irc.Message{
1439 Command: "AUTHENTICATE",
1440 Params: []string{auth.Mechanism},
1441 })
1442 default:
1443 if permanentUpstreamCaps[name] {
1444 break
1445 }
1446 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1447 }
1448 return nil
1449}
1450
1451func splitSpace(s string) []string {
1452 return strings.FieldsFunc(s, func(r rune) bool {
1453 return r == ' '
1454 })
1455}
1456
1457func (uc *upstreamConn) register() {
1458 uc.nick = uc.network.Nick
1459 uc.username = uc.network.Username
1460 if uc.username == "" {
1461 uc.username = uc.nick
1462 }
1463 uc.realname = uc.network.Realname
1464 if uc.realname == "" {
1465 uc.realname = uc.nick
1466 }
1467
1468 uc.SendMessage(&irc.Message{
1469 Command: "CAP",
1470 Params: []string{"LS", "302"},
1471 })
1472
1473 if uc.network.Pass != "" {
1474 uc.SendMessage(&irc.Message{
1475 Command: "PASS",
1476 Params: []string{uc.network.Pass},
1477 })
1478 }
1479
1480 uc.SendMessage(&irc.Message{
1481 Command: "NICK",
1482 Params: []string{uc.nick},
1483 })
1484 uc.SendMessage(&irc.Message{
1485 Command: "USER",
1486 Params: []string{uc.username, "0", "*", uc.realname},
1487 })
1488}
1489
1490func (uc *upstreamConn) runUntilRegistered() error {
1491 for !uc.registered {
1492 msg, err := uc.ReadMessage()
1493 if err != nil {
1494 return fmt.Errorf("failed to read message: %v", err)
1495 }
1496
1497 if err := uc.handleMessage(msg); err != nil {
1498 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1499 }
1500 }
1501
1502 for _, command := range uc.network.ConnectCommands {
1503 m, err := irc.ParseMessage(command)
1504 if err != nil {
1505 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1506 } else {
1507 uc.SendMessage(m)
1508 }
1509 }
1510
1511 return nil
1512}
1513
1514func (uc *upstreamConn) readMessages(ch chan<- event) error {
1515 for {
1516 msg, err := uc.ReadMessage()
1517 if err == io.EOF {
1518 break
1519 } else if err != nil {
1520 return fmt.Errorf("failed to read IRC command: %v", err)
1521 }
1522
1523 ch <- eventUpstreamMessage{msg, uc}
1524 }
1525
1526 return nil
1527}
1528
1529func (uc *upstreamConn) SendMessage(msg *irc.Message) {
1530 if !uc.caps["message-tags"] {
1531 msg = msg.Copy()
1532 msg.Tags = nil
1533 }
1534
1535 uc.conn.SendMessage(msg)
1536}
1537
1538func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1539 if uc.caps["labeled-response"] {
1540 if msg.Tags == nil {
1541 msg.Tags = make(map[string]irc.TagValue)
1542 }
1543 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1544 uc.nextLabelID++
1545 }
1546 uc.SendMessage(msg)
1547}
1548
1549// TODO: handle moving logs when a network name changes, when support for this is added
1550func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) {
1551 if uc.srv.LogPath == "" {
1552 return
1553 }
1554
1555 ml, ok := uc.messageLoggers[entity]
1556 if !ok {
1557 ml = newMessageLogger(uc.network, entity)
1558 uc.messageLoggers[entity] = ml
1559 }
1560
1561 if err := ml.Append(msg); err != nil {
1562 uc.logger.Printf("failed to log message: %v", err)
1563 }
1564}
1565
1566// appendHistory appends a message to the history. entity can be empty.
1567func (uc *upstreamConn) appendHistory(entity string, msg *irc.Message) {
1568 detached := false
1569 if ch, ok := uc.network.channels[entity]; ok {
1570 detached = ch.Detached
1571 }
1572
1573 // If no client is offline, no need to append the message to the buffer
1574 if len(uc.network.offlineClients) == 0 && !detached {
1575 return
1576 }
1577
1578 history, ok := uc.network.history[entity]
1579 if !ok {
1580 history = &networkHistory{
1581 offlineClients: make(map[string]uint64),
1582 ring: NewRing(uc.srv.RingCap),
1583 }
1584 uc.network.history[entity] = history
1585
1586 for clientName, _ := range uc.network.offlineClients {
1587 history.offlineClients[clientName] = 0
1588 }
1589
1590 if detached {
1591 // If the channel is detached, online clients act as offline
1592 // clients too
1593 uc.forEachDownstream(func(dc *downstreamConn) {
1594 history.offlineClients[dc.clientName] = 0
1595 })
1596 }
1597 }
1598
1599 history.ring.Produce(msg)
1600}
1601
1602// produce appends a message to the logs, adds it to the history and forwards
1603// it to connected downstream connections.
1604//
1605// If origin is not nil and origin doesn't support echo-message, the message is
1606// forwarded to all connections except origin.
1607func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1608 if target != "" {
1609 uc.appendLog(target, msg)
1610 }
1611
1612 uc.appendHistory(target, msg)
1613
1614 // Don't forward messages if it's a detached channel
1615 if ch, ok := uc.network.channels[target]; ok && ch.Detached {
1616 return
1617 }
1618
1619 uc.forEachDownstream(func(dc *downstreamConn) {
1620 if dc != origin || dc.caps["echo-message"] {
1621 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1622 }
1623 })
1624}
1625
1626func (uc *upstreamConn) updateAway() {
1627 away := true
1628 uc.forEachDownstream(func(*downstreamConn) {
1629 away = false
1630 })
1631 if away == uc.away {
1632 return
1633 }
1634 if away {
1635 uc.SendMessage(&irc.Message{
1636 Command: "AWAY",
1637 Params: []string{"Auto away"},
1638 })
1639 } else {
1640 uc.SendMessage(&irc.Message{
1641 Command: "AWAY",
1642 })
1643 }
1644 uc.away = away
1645}
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