source: code/trunk/upstream.go@ 292

Last change on this file since 292 was 292, checked in by delthas, 5 years ago

Add support for multiple user channel memberships

User channel memberships are actually a set of memberships, not a single
value. This introduces memberships, a type representing a set of
memberships, stored as an array of memberships ordered by descending
rank.

This also adds multi-prefix to the permanent downstream and upstream
capabilities, so that we try to get all possible channel memberships.
File size: 37.2 KB
Line 
1package soju
2
3import (
4 "crypto/tls"
5 "encoding/base64"
6 "errors"
7 "fmt"
8 "io"
9 "net"
10 "strconv"
11 "strings"
12 "time"
13 "unicode"
14 "unicode/utf8"
15
16 "github.com/emersion/go-sasl"
17 "gopkg.in/irc.v3"
18)
19
20// permanentUpstreamCaps is the static list of upstream capabilities always
21// requested when supported.
22var permanentUpstreamCaps = map[string]bool{
23 "away-notify": true,
24 "batch": true,
25 "labeled-response": true,
26 "message-tags": true,
27 "multi-prefix": true,
28 "server-time": true,
29}
30
31type upstreamChannel struct {
32 Name string
33 conn *upstreamConn
34 Topic string
35 TopicWho string
36 TopicTime time.Time
37 Status channelStatus
38 modes channelModes
39 creationTime string
40 Members map[string]*memberships
41 complete bool
42}
43
44type upstreamConn struct {
45 conn
46
47 network *network
48 user *user
49
50 serverName string
51 availableUserModes string
52 availableChannelModes map[byte]channelModeType
53 availableChannelTypes string
54 availableMemberships []membership
55
56 registered bool
57 nick string
58 username string
59 realname string
60 modes userModes
61 channels map[string]*upstreamChannel
62 supportedCaps map[string]string
63 caps map[string]bool
64 batches map[string]batch
65 away bool
66 nextLabelID uint64
67
68 saslClient sasl.Client
69 saslStarted bool
70
71 // set of LIST commands in progress, per downstream
72 pendingLISTDownstreamSet map[uint64]struct{}
73
74 messageLoggers map[string]*messageLogger
75}
76
77func connectToUpstream(network *network) (*upstreamConn, error) {
78 logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
79
80 var scheme string
81 var addr string
82
83 addrParts := strings.SplitN(network.Addr, "://", 2)
84 if len(addrParts) == 2 {
85 scheme = addrParts[0]
86 addr = addrParts[1]
87 } else {
88 scheme = "ircs"
89 addr = addrParts[0]
90 }
91
92 dialer := net.Dialer{Timeout: connectTimeout}
93
94 var netConn net.Conn
95 var err error
96 switch scheme {
97 case "ircs":
98 if !strings.ContainsRune(addr, ':') {
99 addr = addr + ":6697"
100 }
101
102 logger.Printf("connecting to TLS server at address %q", addr)
103 netConn, err = tls.DialWithDialer(&dialer, "tcp", addr, nil)
104 case "irc+insecure":
105 if !strings.ContainsRune(addr, ':') {
106 addr = addr + ":6667"
107 }
108
109 logger.Printf("connecting to plain-text server at address %q", addr)
110 netConn, err = dialer.Dial("tcp", addr)
111 default:
112 return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", addr, scheme)
113 }
114 if err != nil {
115 return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
116 }
117
118 uc := &upstreamConn{
119 conn: *newConn(network.user.srv, netConn, logger),
120 network: network,
121 user: network.user,
122 channels: make(map[string]*upstreamChannel),
123 supportedCaps: make(map[string]string),
124 caps: make(map[string]bool),
125 batches: make(map[string]batch),
126 availableChannelTypes: stdChannelTypes,
127 availableChannelModes: stdChannelModes,
128 availableMemberships: stdMemberships,
129 pendingLISTDownstreamSet: make(map[uint64]struct{}),
130 messageLoggers: make(map[string]*messageLogger),
131 }
132
133 return uc, nil
134}
135
136func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
137 uc.network.forEachDownstream(f)
138}
139
140func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
141 uc.forEachDownstream(func(dc *downstreamConn) {
142 if id != 0 && id != dc.id {
143 return
144 }
145 f(dc)
146 })
147}
148
149func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
150 ch, ok := uc.channels[name]
151 if !ok {
152 return nil, fmt.Errorf("unknown channel %q", name)
153 }
154 return ch, nil
155}
156
157func (uc *upstreamConn) isChannel(entity string) bool {
158 if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
159 return true
160 }
161 return false
162}
163
164func (uc *upstreamConn) getPendingLIST() *pendingLIST {
165 for _, pl := range uc.user.pendingLISTs {
166 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
167 continue
168 }
169 return &pl
170 }
171 return nil
172}
173
174func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
175 found = false
176 for i := 0; i < len(uc.user.pendingLISTs); i++ {
177 pl := uc.user.pendingLISTs[i]
178 if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
179 continue
180 }
181 delete(pl.pendingCommands, uc.network.ID)
182 if len(pl.pendingCommands) == 0 {
183 uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
184 i--
185 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
186 dc.SendMessage(&irc.Message{
187 Prefix: dc.srv.prefix(),
188 Command: irc.RPL_LISTEND,
189 Params: []string{dc.nick, "End of /LIST"},
190 })
191 })
192 }
193 found = true
194 if !all {
195 delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
196 uc.user.forEachUpstream(func(uc *upstreamConn) {
197 uc.trySendLIST(pl.downstreamID)
198 })
199 return
200 }
201 }
202 return
203}
204
205func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
206 if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
207 // a LIST command is already pending
208 // we will try again when that command is completed
209 return
210 }
211
212 for _, pl := range uc.user.pendingLISTs {
213 if pl.downstreamID != downstreamID {
214 continue
215 }
216 // this is the first pending LIST command list of the downstream
217 listCommand, ok := pl.pendingCommands[uc.network.ID]
218 if !ok {
219 // there is no command for this upstream in these LIST commands
220 // do not send anything
221 continue
222 }
223 // there is a command for this upstream in these LIST commands
224 // send it now
225
226 uc.SendMessageLabeled(downstreamID, listCommand)
227
228 uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
229 return
230 }
231}
232
233func (uc *upstreamConn) parseMembershipPrefix(s string) (ms *memberships, nick string) {
234 memberships := make(memberships, 0, 4)
235 i := 0
236 for _, m := range uc.availableMemberships {
237 if i >= len(s) {
238 break
239 }
240 if s[i] == m.Prefix {
241 memberships = append(memberships, m)
242 i++
243 }
244 }
245 return &memberships, s[i:]
246}
247
248func isWordBoundary(r rune) bool {
249 switch r {
250 case '-', '_', '|':
251 return false
252 case '\u00A0':
253 return true
254 default:
255 return !unicode.IsLetter(r) && !unicode.IsNumber(r)
256 }
257}
258
259func isHighlight(text, nick string) bool {
260 for {
261 i := strings.Index(text, nick)
262 if i < 0 {
263 return false
264 }
265
266 // Detect word boundaries
267 var left, right rune
268 if i > 0 {
269 left, _ = utf8.DecodeLastRuneInString(text[:i])
270 }
271 if i < len(text) {
272 right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
273 }
274 if isWordBoundary(left) && isWordBoundary(right) {
275 return true
276 }
277
278 text = text[i+len(nick):]
279 }
280}
281
282func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
283 var label string
284 if l, ok := msg.GetTag("label"); ok {
285 label = l
286 }
287
288 var msgBatch *batch
289 if batchName, ok := msg.GetTag("batch"); ok {
290 b, ok := uc.batches[batchName]
291 if !ok {
292 return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
293 }
294 msgBatch = &b
295 if label == "" {
296 label = msgBatch.Label
297 }
298 }
299
300 var downstreamID uint64 = 0
301 if label != "" {
302 var labelOffset uint64
303 n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
304 if err == nil && n < 2 {
305 err = errors.New("not enough arguments")
306 }
307 if err != nil {
308 return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
309 }
310 }
311
312 if _, ok := msg.Tags["time"]; !ok {
313 msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
314 }
315
316 switch msg.Command {
317 case "PING":
318 uc.SendMessage(&irc.Message{
319 Command: "PONG",
320 Params: msg.Params,
321 })
322 return nil
323 case "NOTICE", "PRIVMSG":
324 if msg.Prefix == nil {
325 return fmt.Errorf("expected a prefix")
326 }
327
328 var entity, text string
329 if err := parseMessageParams(msg, &entity, &text); err != nil {
330 return err
331 }
332
333 if msg.Prefix.Name == serviceNick {
334 uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
335 break
336 }
337 if entity == serviceNick {
338 uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
339 break
340 }
341
342 if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
343 uc.produce("", msg, nil)
344 } else { // regular user NOTICE or PRIVMSG
345 target := entity
346 if target == uc.nick {
347 target = msg.Prefix.Name
348 }
349 uc.produce(target, msg, nil)
350
351 highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
352 if ch, ok := uc.network.channels[target]; ok && ch.Detached && highlight {
353 uc.forEachDownstream(func(dc *downstreamConn) {
354 sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), msg.Prefix.Name, text))
355 })
356 }
357 }
358 case "CAP":
359 var subCmd string
360 if err := parseMessageParams(msg, nil, &subCmd); err != nil {
361 return err
362 }
363 subCmd = strings.ToUpper(subCmd)
364 subParams := msg.Params[2:]
365 switch subCmd {
366 case "LS":
367 if len(subParams) < 1 {
368 return newNeedMoreParamsError(msg.Command)
369 }
370 caps := subParams[len(subParams)-1]
371 more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
372
373 uc.handleSupportedCaps(caps)
374
375 if more {
376 break // wait to receive all capabilities
377 }
378
379 uc.requestCaps()
380
381 if uc.requestSASL() {
382 break // we'll send CAP END after authentication is completed
383 }
384
385 uc.SendMessage(&irc.Message{
386 Command: "CAP",
387 Params: []string{"END"},
388 })
389 case "ACK", "NAK":
390 if len(subParams) < 1 {
391 return newNeedMoreParamsError(msg.Command)
392 }
393 caps := strings.Fields(subParams[0])
394
395 for _, name := range caps {
396 if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
397 return err
398 }
399 }
400
401 if uc.saslClient == nil {
402 uc.SendMessage(&irc.Message{
403 Command: "CAP",
404 Params: []string{"END"},
405 })
406 }
407
408 if uc.registered {
409 uc.forEachDownstream(func(dc *downstreamConn) {
410 dc.updateSupportedCaps()
411 })
412 }
413 case "NEW":
414 if len(subParams) < 1 {
415 return newNeedMoreParamsError(msg.Command)
416 }
417 uc.handleSupportedCaps(subParams[0])
418 uc.requestCaps()
419 case "DEL":
420 if len(subParams) < 1 {
421 return newNeedMoreParamsError(msg.Command)
422 }
423 caps := strings.Fields(subParams[0])
424
425 for _, c := range caps {
426 delete(uc.supportedCaps, c)
427 delete(uc.caps, c)
428 }
429
430 if uc.registered {
431 uc.forEachDownstream(func(dc *downstreamConn) {
432 dc.updateSupportedCaps()
433 })
434 }
435 default:
436 uc.logger.Printf("unhandled message: %v", msg)
437 }
438 case "AUTHENTICATE":
439 if uc.saslClient == nil {
440 return fmt.Errorf("received unexpected AUTHENTICATE message")
441 }
442
443 // TODO: if a challenge is 400 bytes long, buffer it
444 var challengeStr string
445 if err := parseMessageParams(msg, &challengeStr); err != nil {
446 uc.SendMessage(&irc.Message{
447 Command: "AUTHENTICATE",
448 Params: []string{"*"},
449 })
450 return err
451 }
452
453 var challenge []byte
454 if challengeStr != "+" {
455 var err error
456 challenge, err = base64.StdEncoding.DecodeString(challengeStr)
457 if err != nil {
458 uc.SendMessage(&irc.Message{
459 Command: "AUTHENTICATE",
460 Params: []string{"*"},
461 })
462 return err
463 }
464 }
465
466 var resp []byte
467 var err error
468 if !uc.saslStarted {
469 _, resp, err = uc.saslClient.Start()
470 uc.saslStarted = true
471 } else {
472 resp, err = uc.saslClient.Next(challenge)
473 }
474 if err != nil {
475 uc.SendMessage(&irc.Message{
476 Command: "AUTHENTICATE",
477 Params: []string{"*"},
478 })
479 return err
480 }
481
482 // TODO: send response in multiple chunks if >= 400 bytes
483 var respStr = "+"
484 if resp != nil {
485 respStr = base64.StdEncoding.EncodeToString(resp)
486 }
487
488 uc.SendMessage(&irc.Message{
489 Command: "AUTHENTICATE",
490 Params: []string{respStr},
491 })
492 case irc.RPL_LOGGEDIN:
493 var account string
494 if err := parseMessageParams(msg, nil, nil, &account); err != nil {
495 return err
496 }
497 uc.logger.Printf("logged in with account %q", account)
498 case irc.RPL_LOGGEDOUT:
499 uc.logger.Printf("logged out")
500 case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
501 var info string
502 if err := parseMessageParams(msg, nil, &info); err != nil {
503 return err
504 }
505 switch msg.Command {
506 case irc.ERR_NICKLOCKED:
507 uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
508 case irc.ERR_SASLFAIL:
509 uc.logger.Printf("SASL authentication failed: %v", info)
510 case irc.ERR_SASLTOOLONG:
511 uc.logger.Printf("SASL message too long: %v", info)
512 }
513
514 uc.saslClient = nil
515 uc.saslStarted = false
516
517 uc.SendMessage(&irc.Message{
518 Command: "CAP",
519 Params: []string{"END"},
520 })
521 case irc.RPL_WELCOME:
522 uc.registered = true
523 uc.logger.Printf("connection registered")
524
525 uc.forEachDownstream(func(dc *downstreamConn) {
526 dc.updateSupportedCaps()
527 })
528
529 for _, ch := range uc.network.channels {
530 params := []string{ch.Name}
531 if ch.Key != "" {
532 params = append(params, ch.Key)
533 }
534 uc.SendMessage(&irc.Message{
535 Command: "JOIN",
536 Params: params,
537 })
538 }
539 case irc.RPL_MYINFO:
540 if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
541 return err
542 }
543 case irc.RPL_ISUPPORT:
544 if err := parseMessageParams(msg, nil, nil); err != nil {
545 return err
546 }
547 for _, token := range msg.Params[1 : len(msg.Params)-1] {
548 negate := false
549 parameter := token
550 value := ""
551 if strings.HasPrefix(token, "-") {
552 negate = true
553 token = token[1:]
554 } else {
555 if i := strings.IndexByte(token, '='); i >= 0 {
556 parameter = token[:i]
557 value = token[i+1:]
558 }
559 }
560 if !negate {
561 switch parameter {
562 case "CHANMODES":
563 parts := strings.SplitN(value, ",", 5)
564 if len(parts) < 4 {
565 return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
566 }
567 modes := make(map[byte]channelModeType)
568 for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
569 for j := 0; j < len(parts[i]); j++ {
570 mode := parts[i][j]
571 modes[mode] = mt
572 }
573 }
574 uc.availableChannelModes = modes
575 case "CHANTYPES":
576 uc.availableChannelTypes = value
577 case "PREFIX":
578 if value == "" {
579 uc.availableMemberships = nil
580 } else {
581 if value[0] != '(' {
582 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
583 }
584 sep := strings.IndexByte(value, ')')
585 if sep < 0 || len(value) != sep*2 {
586 return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
587 }
588 memberships := make([]membership, len(value)/2-1)
589 for i := range memberships {
590 memberships[i] = membership{
591 Mode: value[i+1],
592 Prefix: value[sep+i+1],
593 }
594 }
595 uc.availableMemberships = memberships
596 }
597 }
598 } else {
599 // TODO: handle ISUPPORT negations
600 }
601 }
602 case "BATCH":
603 var tag string
604 if err := parseMessageParams(msg, &tag); err != nil {
605 return err
606 }
607
608 if strings.HasPrefix(tag, "+") {
609 tag = tag[1:]
610 if _, ok := uc.batches[tag]; ok {
611 return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
612 }
613 var batchType string
614 if err := parseMessageParams(msg, nil, &batchType); err != nil {
615 return err
616 }
617 label := label
618 if label == "" && msgBatch != nil {
619 label = msgBatch.Label
620 }
621 uc.batches[tag] = batch{
622 Type: batchType,
623 Params: msg.Params[2:],
624 Outer: msgBatch,
625 Label: label,
626 }
627 } else if strings.HasPrefix(tag, "-") {
628 tag = tag[1:]
629 if _, ok := uc.batches[tag]; !ok {
630 return fmt.Errorf("unknown BATCH reference tag: %q", tag)
631 }
632 delete(uc.batches, tag)
633 } else {
634 return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
635 }
636 case "NICK":
637 if msg.Prefix == nil {
638 return fmt.Errorf("expected a prefix")
639 }
640
641 var newNick string
642 if err := parseMessageParams(msg, &newNick); err != nil {
643 return err
644 }
645
646 me := false
647 if msg.Prefix.Name == uc.nick {
648 uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
649 me = true
650 uc.nick = newNick
651 }
652
653 for _, ch := range uc.channels {
654 if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
655 delete(ch.Members, msg.Prefix.Name)
656 ch.Members[newNick] = memberships
657 uc.appendLog(ch.Name, msg)
658 uc.appendHistory(ch.Name, msg)
659 }
660 }
661
662 if !me {
663 uc.forEachDownstream(func(dc *downstreamConn) {
664 dc.SendMessage(dc.marshalMessage(msg, uc.network))
665 })
666 }
667 case "JOIN":
668 if msg.Prefix == nil {
669 return fmt.Errorf("expected a prefix")
670 }
671
672 var channels string
673 if err := parseMessageParams(msg, &channels); err != nil {
674 return err
675 }
676
677 for _, ch := range strings.Split(channels, ",") {
678 if msg.Prefix.Name == uc.nick {
679 uc.logger.Printf("joined channel %q", ch)
680 uc.channels[ch] = &upstreamChannel{
681 Name: ch,
682 conn: uc,
683 Members: make(map[string]*memberships),
684 }
685
686 uc.SendMessage(&irc.Message{
687 Command: "MODE",
688 Params: []string{ch},
689 })
690 } else {
691 ch, err := uc.getChannel(ch)
692 if err != nil {
693 return err
694 }
695 ch.Members[msg.Prefix.Name] = nil
696 }
697
698 chMsg := msg.Copy()
699 chMsg.Params[0] = ch
700 uc.produce(ch, chMsg, nil)
701 }
702 case "PART":
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("parted channel %q", ch)
715 delete(uc.channels, ch)
716 } else {
717 ch, err := uc.getChannel(ch)
718 if err != nil {
719 return err
720 }
721 delete(ch.Members, msg.Prefix.Name)
722 }
723
724 chMsg := msg.Copy()
725 chMsg.Params[0] = ch
726 uc.produce(ch, chMsg, nil)
727 }
728 case "KICK":
729 if msg.Prefix == nil {
730 return fmt.Errorf("expected a prefix")
731 }
732
733 var channel, user string
734 if err := parseMessageParams(msg, &channel, &user); err != nil {
735 return err
736 }
737
738 if user == uc.nick {
739 uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
740 delete(uc.channels, channel)
741 } else {
742 ch, err := uc.getChannel(channel)
743 if err != nil {
744 return err
745 }
746 delete(ch.Members, user)
747 }
748
749 uc.produce(channel, msg, nil)
750 case "QUIT":
751 if msg.Prefix == nil {
752 return fmt.Errorf("expected a prefix")
753 }
754
755 if msg.Prefix.Name == uc.nick {
756 uc.logger.Printf("quit")
757 }
758
759 for _, ch := range uc.channels {
760 if _, ok := ch.Members[msg.Prefix.Name]; ok {
761 delete(ch.Members, msg.Prefix.Name)
762
763 uc.appendLog(ch.Name, msg)
764 uc.appendHistory(ch.Name, msg)
765 }
766 }
767
768 if msg.Prefix.Name != uc.nick {
769 uc.forEachDownstream(func(dc *downstreamConn) {
770 dc.SendMessage(dc.marshalMessage(msg, uc.network))
771 })
772 }
773 case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
774 var name, topic string
775 if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
776 return err
777 }
778 ch, err := uc.getChannel(name)
779 if err != nil {
780 return err
781 }
782 if msg.Command == irc.RPL_TOPIC {
783 ch.Topic = topic
784 } else {
785 ch.Topic = ""
786 }
787 case "TOPIC":
788 var name string
789 if err := parseMessageParams(msg, &name); err != nil {
790 return err
791 }
792 ch, err := uc.getChannel(name)
793 if err != nil {
794 return err
795 }
796 if len(msg.Params) > 1 {
797 ch.Topic = msg.Params[1]
798 } else {
799 ch.Topic = ""
800 }
801 uc.produce(ch.Name, msg, nil)
802 case "MODE":
803 var name, modeStr string
804 if err := parseMessageParams(msg, &name, &modeStr); err != nil {
805 return err
806 }
807
808 if !uc.isChannel(name) { // user mode change
809 if name != uc.nick {
810 return fmt.Errorf("received MODE message for unknown nick %q", name)
811 }
812 return uc.modes.Apply(modeStr)
813 // TODO: notify downstreams about user mode change?
814 } else { // channel mode change
815 ch, err := uc.getChannel(name)
816 if err != nil {
817 return err
818 }
819
820 if ch.modes != nil {
821 if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[2:]...); err != nil {
822 return err
823 }
824 }
825
826 uc.produce(ch.Name, msg, nil)
827 }
828 case irc.RPL_UMODEIS:
829 if err := parseMessageParams(msg, nil); err != nil {
830 return err
831 }
832 modeStr := ""
833 if len(msg.Params) > 1 {
834 modeStr = msg.Params[1]
835 }
836
837 uc.modes = ""
838 if err := uc.modes.Apply(modeStr); err != nil {
839 return err
840 }
841 // TODO: send RPL_UMODEIS to downstream connections when applicable
842 case irc.RPL_CHANNELMODEIS:
843 var channel string
844 if err := parseMessageParams(msg, nil, &channel); err != nil {
845 return err
846 }
847 modeStr := ""
848 if len(msg.Params) > 2 {
849 modeStr = msg.Params[2]
850 }
851
852 ch, err := uc.getChannel(channel)
853 if err != nil {
854 return err
855 }
856
857 firstMode := ch.modes == nil
858 ch.modes = make(map[byte]string)
859 if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[3:]...); err != nil {
860 return err
861 }
862 if firstMode {
863 modeStr, modeParams := ch.modes.Format()
864
865 uc.forEachDownstream(func(dc *downstreamConn) {
866 params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
867 params = append(params, modeParams...)
868
869 dc.SendMessage(&irc.Message{
870 Prefix: dc.srv.prefix(),
871 Command: irc.RPL_CHANNELMODEIS,
872 Params: params,
873 })
874 })
875 }
876 case rpl_creationtime:
877 var channel, creationTime string
878 if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
879 return err
880 }
881
882 ch, err := uc.getChannel(channel)
883 if err != nil {
884 return err
885 }
886
887 firstCreationTime := ch.creationTime == ""
888 ch.creationTime = creationTime
889 if firstCreationTime {
890 uc.forEachDownstream(func(dc *downstreamConn) {
891 dc.SendMessage(&irc.Message{
892 Prefix: dc.srv.prefix(),
893 Command: rpl_creationtime,
894 Params: []string{dc.nick, channel, creationTime},
895 })
896 })
897 }
898 case rpl_topicwhotime:
899 var name, who, timeStr string
900 if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
901 return err
902 }
903 ch, err := uc.getChannel(name)
904 if err != nil {
905 return err
906 }
907 ch.TopicWho = who
908 sec, err := strconv.ParseInt(timeStr, 10, 64)
909 if err != nil {
910 return fmt.Errorf("failed to parse topic time: %v", err)
911 }
912 ch.TopicTime = time.Unix(sec, 0)
913 case irc.RPL_LIST:
914 var channel, clients, topic string
915 if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
916 return err
917 }
918
919 pl := uc.getPendingLIST()
920 if pl == nil {
921 return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
922 }
923
924 uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
925 dc.SendMessage(&irc.Message{
926 Prefix: dc.srv.prefix(),
927 Command: irc.RPL_LIST,
928 Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
929 })
930 })
931 case irc.RPL_LISTEND:
932 ok := uc.endPendingLISTs(false)
933 if !ok {
934 return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
935 }
936 case irc.RPL_NAMREPLY:
937 var name, statusStr, members string
938 if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
939 return err
940 }
941
942 ch, ok := uc.channels[name]
943 if !ok {
944 // NAMES on a channel we have not joined, forward to downstream
945 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
946 channel := dc.marshalEntity(uc.network, name)
947 members := splitSpace(members)
948 for i, member := range members {
949 memberships, nick := uc.parseMembershipPrefix(member)
950 members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
951 }
952 memberStr := strings.Join(members, " ")
953
954 dc.SendMessage(&irc.Message{
955 Prefix: dc.srv.prefix(),
956 Command: irc.RPL_NAMREPLY,
957 Params: []string{dc.nick, statusStr, channel, memberStr},
958 })
959 })
960 return nil
961 }
962
963 status, err := parseChannelStatus(statusStr)
964 if err != nil {
965 return err
966 }
967 ch.Status = status
968
969 for _, s := range splitSpace(members) {
970 memberships, nick := uc.parseMembershipPrefix(s)
971 ch.Members[nick] = memberships
972 }
973 case irc.RPL_ENDOFNAMES:
974 var name string
975 if err := parseMessageParams(msg, nil, &name); err != nil {
976 return err
977 }
978
979 ch, ok := uc.channels[name]
980 if !ok {
981 // NAMES on a channel we have not joined, forward to downstream
982 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
983 channel := dc.marshalEntity(uc.network, name)
984
985 dc.SendMessage(&irc.Message{
986 Prefix: dc.srv.prefix(),
987 Command: irc.RPL_ENDOFNAMES,
988 Params: []string{dc.nick, channel, "End of /NAMES list"},
989 })
990 })
991 return nil
992 }
993
994 if ch.complete {
995 return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
996 }
997 ch.complete = true
998
999 uc.forEachDownstream(func(dc *downstreamConn) {
1000 forwardChannel(dc, ch)
1001 })
1002 case irc.RPL_WHOREPLY:
1003 var channel, username, host, server, nick, mode, trailing string
1004 if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
1005 return err
1006 }
1007
1008 parts := strings.SplitN(trailing, " ", 2)
1009 if len(parts) != 2 {
1010 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
1011 }
1012 realname := parts[1]
1013 hops, err := strconv.Atoi(parts[0])
1014 if err != nil {
1015 return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
1016 }
1017 hops++
1018
1019 trailing = strconv.Itoa(hops) + " " + realname
1020
1021 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1022 channel := channel
1023 if channel != "*" {
1024 channel = dc.marshalEntity(uc.network, channel)
1025 }
1026 nick := dc.marshalEntity(uc.network, nick)
1027 dc.SendMessage(&irc.Message{
1028 Prefix: dc.srv.prefix(),
1029 Command: irc.RPL_WHOREPLY,
1030 Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
1031 })
1032 })
1033 case irc.RPL_ENDOFWHO:
1034 var name string
1035 if err := parseMessageParams(msg, nil, &name); err != nil {
1036 return err
1037 }
1038
1039 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1040 name := name
1041 if name != "*" {
1042 // TODO: support WHO masks
1043 name = dc.marshalEntity(uc.network, name)
1044 }
1045 dc.SendMessage(&irc.Message{
1046 Prefix: dc.srv.prefix(),
1047 Command: irc.RPL_ENDOFWHO,
1048 Params: []string{dc.nick, name, "End of /WHO list"},
1049 })
1050 })
1051 case irc.RPL_WHOISUSER:
1052 var nick, username, host, realname string
1053 if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
1054 return err
1055 }
1056
1057 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1058 nick := dc.marshalEntity(uc.network, nick)
1059 dc.SendMessage(&irc.Message{
1060 Prefix: dc.srv.prefix(),
1061 Command: irc.RPL_WHOISUSER,
1062 Params: []string{dc.nick, nick, username, host, "*", realname},
1063 })
1064 })
1065 case irc.RPL_WHOISSERVER:
1066 var nick, server, serverInfo string
1067 if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
1068 return err
1069 }
1070
1071 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1072 nick := dc.marshalEntity(uc.network, nick)
1073 dc.SendMessage(&irc.Message{
1074 Prefix: dc.srv.prefix(),
1075 Command: irc.RPL_WHOISSERVER,
1076 Params: []string{dc.nick, nick, server, serverInfo},
1077 })
1078 })
1079 case irc.RPL_WHOISOPERATOR:
1080 var nick string
1081 if err := parseMessageParams(msg, nil, &nick); err != nil {
1082 return err
1083 }
1084
1085 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1086 nick := dc.marshalEntity(uc.network, nick)
1087 dc.SendMessage(&irc.Message{
1088 Prefix: dc.srv.prefix(),
1089 Command: irc.RPL_WHOISOPERATOR,
1090 Params: []string{dc.nick, nick, "is an IRC operator"},
1091 })
1092 })
1093 case irc.RPL_WHOISIDLE:
1094 var nick string
1095 if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
1096 return err
1097 }
1098
1099 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1100 nick := dc.marshalEntity(uc.network, nick)
1101 params := []string{dc.nick, nick}
1102 params = append(params, msg.Params[2:]...)
1103 dc.SendMessage(&irc.Message{
1104 Prefix: dc.srv.prefix(),
1105 Command: irc.RPL_WHOISIDLE,
1106 Params: params,
1107 })
1108 })
1109 case irc.RPL_WHOISCHANNELS:
1110 var nick, channelList string
1111 if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
1112 return err
1113 }
1114 channels := splitSpace(channelList)
1115
1116 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1117 nick := dc.marshalEntity(uc.network, nick)
1118 channelList := make([]string, len(channels))
1119 for i, channel := range channels {
1120 prefix, channel := uc.parseMembershipPrefix(channel)
1121 channel = dc.marshalEntity(uc.network, channel)
1122 channelList[i] = prefix.Format(dc) + channel
1123 }
1124 channels := strings.Join(channelList, " ")
1125 dc.SendMessage(&irc.Message{
1126 Prefix: dc.srv.prefix(),
1127 Command: irc.RPL_WHOISCHANNELS,
1128 Params: []string{dc.nick, nick, channels},
1129 })
1130 })
1131 case irc.RPL_ENDOFWHOIS:
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_ENDOFWHOIS,
1142 Params: []string{dc.nick, nick, "End of /WHOIS list"},
1143 })
1144 })
1145 case "INVITE":
1146 var nick, channel string
1147 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1148 return err
1149 }
1150
1151 uc.forEachDownstream(func(dc *downstreamConn) {
1152 dc.SendMessage(&irc.Message{
1153 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1154 Command: "INVITE",
1155 Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1156 })
1157 })
1158 case irc.RPL_INVITING:
1159 var nick, channel string
1160 if err := parseMessageParams(msg, &nick, &channel); err != nil {
1161 return err
1162 }
1163
1164 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1165 dc.SendMessage(&irc.Message{
1166 Prefix: dc.srv.prefix(),
1167 Command: irc.RPL_INVITING,
1168 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
1169 })
1170 })
1171 case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
1172 var command, reason string
1173 if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
1174 return err
1175 }
1176
1177 if command == "LIST" {
1178 ok := uc.endPendingLISTs(false)
1179 if !ok {
1180 return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
1181 }
1182 uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
1183 dc.SendMessage(&irc.Message{
1184 Prefix: uc.srv.prefix(),
1185 Command: msg.Command,
1186 Params: []string{dc.nick, "LIST", reason},
1187 })
1188 })
1189 }
1190 case irc.RPL_AWAY:
1191 var nick, reason string
1192 if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
1193 return err
1194 }
1195
1196 uc.forEachDownstream(func(dc *downstreamConn) {
1197 dc.SendMessage(&irc.Message{
1198 Prefix: dc.srv.prefix(),
1199 Command: irc.RPL_AWAY,
1200 Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
1201 })
1202 })
1203 case "AWAY":
1204 if msg.Prefix == nil {
1205 return fmt.Errorf("expected a prefix")
1206 }
1207
1208 uc.forEachDownstream(func(dc *downstreamConn) {
1209 if !dc.caps["away-notify"] {
1210 return
1211 }
1212 dc.SendMessage(&irc.Message{
1213 Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
1214 Command: "AWAY",
1215 Params: msg.Params,
1216 })
1217 })
1218 case "TAGMSG":
1219 // TODO: relay to downstream connections that accept message-tags
1220 case "ACK":
1221 // Ignore
1222 case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
1223 // Ignore
1224 case irc.RPL_YOURHOST, irc.RPL_CREATED:
1225 // Ignore
1226 case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
1227 // Ignore
1228 case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
1229 // Ignore
1230 case irc.RPL_LISTSTART:
1231 // Ignore
1232 case rpl_localusers, rpl_globalusers:
1233 // Ignore
1234 case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
1235 // Ignore
1236 default:
1237 uc.logger.Printf("unhandled message: %v", msg)
1238 }
1239 return nil
1240}
1241
1242func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
1243 caps := strings.Fields(capsStr)
1244 for _, s := range caps {
1245 kv := strings.SplitN(s, "=", 2)
1246 k := strings.ToLower(kv[0])
1247 var v string
1248 if len(kv) == 2 {
1249 v = kv[1]
1250 }
1251 uc.supportedCaps[k] = v
1252 }
1253}
1254
1255func (uc *upstreamConn) requestCaps() {
1256 var requestCaps []string
1257 for c := range permanentUpstreamCaps {
1258 if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
1259 requestCaps = append(requestCaps, c)
1260 }
1261 }
1262
1263 if uc.requestSASL() && !uc.caps["sasl"] {
1264 requestCaps = append(requestCaps, "sasl")
1265 }
1266
1267 if len(requestCaps) == 0 {
1268 return
1269 }
1270
1271 uc.SendMessage(&irc.Message{
1272 Command: "CAP",
1273 Params: []string{"REQ", strings.Join(requestCaps, " ")},
1274 })
1275}
1276
1277func (uc *upstreamConn) requestSASL() bool {
1278 if uc.network.SASL.Mechanism == "" {
1279 return false
1280 }
1281
1282 v, ok := uc.supportedCaps["sasl"]
1283 if !ok {
1284 return false
1285 }
1286 if v != "" {
1287 mechanisms := strings.Split(v, ",")
1288 found := false
1289 for _, mech := range mechanisms {
1290 if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
1291 found = true
1292 break
1293 }
1294 }
1295 if !found {
1296 return false
1297 }
1298 }
1299
1300 return true
1301}
1302
1303func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
1304 uc.caps[name] = ok
1305
1306 switch name {
1307 case "sasl":
1308 if !ok {
1309 uc.logger.Printf("server refused to acknowledge the SASL capability")
1310 return nil
1311 }
1312
1313 auth := &uc.network.SASL
1314 switch auth.Mechanism {
1315 case "PLAIN":
1316 uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
1317 uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
1318 default:
1319 return fmt.Errorf("unsupported SASL mechanism %q", name)
1320 }
1321
1322 uc.SendMessage(&irc.Message{
1323 Command: "AUTHENTICATE",
1324 Params: []string{auth.Mechanism},
1325 })
1326 default:
1327 if permanentUpstreamCaps[name] {
1328 break
1329 }
1330 uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
1331 }
1332 return nil
1333}
1334
1335func splitSpace(s string) []string {
1336 return strings.FieldsFunc(s, func(r rune) bool {
1337 return r == ' '
1338 })
1339}
1340
1341func (uc *upstreamConn) register() {
1342 uc.nick = uc.network.Nick
1343 uc.username = uc.network.Username
1344 if uc.username == "" {
1345 uc.username = uc.nick
1346 }
1347 uc.realname = uc.network.Realname
1348 if uc.realname == "" {
1349 uc.realname = uc.nick
1350 }
1351
1352 uc.SendMessage(&irc.Message{
1353 Command: "CAP",
1354 Params: []string{"LS", "302"},
1355 })
1356
1357 if uc.network.Pass != "" {
1358 uc.SendMessage(&irc.Message{
1359 Command: "PASS",
1360 Params: []string{uc.network.Pass},
1361 })
1362 }
1363
1364 uc.SendMessage(&irc.Message{
1365 Command: "NICK",
1366 Params: []string{uc.nick},
1367 })
1368 uc.SendMessage(&irc.Message{
1369 Command: "USER",
1370 Params: []string{uc.username, "0", "*", uc.realname},
1371 })
1372}
1373
1374func (uc *upstreamConn) runUntilRegistered() error {
1375 for !uc.registered {
1376 msg, err := uc.ReadMessage()
1377 if err != nil {
1378 return fmt.Errorf("failed to read message: %v", err)
1379 }
1380
1381 if err := uc.handleMessage(msg); err != nil {
1382 return fmt.Errorf("failed to handle message %q: %v", msg, err)
1383 }
1384 }
1385
1386 for _, command := range uc.network.ConnectCommands {
1387 m, err := irc.ParseMessage(command)
1388 if err != nil {
1389 uc.logger.Printf("failed to parse connect command %q: %v", command, err)
1390 } else {
1391 uc.SendMessage(m)
1392 }
1393 }
1394
1395 return nil
1396}
1397
1398func (uc *upstreamConn) readMessages(ch chan<- event) error {
1399 for {
1400 msg, err := uc.ReadMessage()
1401 if err == io.EOF {
1402 break
1403 } else if err != nil {
1404 return fmt.Errorf("failed to read IRC command: %v", err)
1405 }
1406
1407 ch <- eventUpstreamMessage{msg, uc}
1408 }
1409
1410 return nil
1411}
1412
1413func (uc *upstreamConn) SendMessageLabeled(downstreamID uint64, msg *irc.Message) {
1414 if uc.caps["labeled-response"] {
1415 if msg.Tags == nil {
1416 msg.Tags = make(map[string]irc.TagValue)
1417 }
1418 msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
1419 uc.nextLabelID++
1420 }
1421 uc.SendMessage(msg)
1422}
1423
1424// TODO: handle moving logs when a network name changes, when support for this is added
1425func (uc *upstreamConn) appendLog(entity string, msg *irc.Message) {
1426 if uc.srv.LogPath == "" {
1427 return
1428 }
1429
1430 ml, ok := uc.messageLoggers[entity]
1431 if !ok {
1432 ml = newMessageLogger(uc.network, entity)
1433 uc.messageLoggers[entity] = ml
1434 }
1435
1436 if err := ml.Append(msg); err != nil {
1437 uc.logger.Printf("failed to log message: %v", err)
1438 }
1439}
1440
1441// appendHistory appends a message to the history. entity can be empty.
1442func (uc *upstreamConn) appendHistory(entity string, msg *irc.Message) {
1443 detached := false
1444 if ch, ok := uc.network.channels[entity]; ok {
1445 detached = ch.Detached
1446 }
1447
1448 // If no client is offline, no need to append the message to the buffer
1449 if len(uc.network.offlineClients) == 0 && !detached {
1450 return
1451 }
1452
1453 history, ok := uc.network.history[entity]
1454 if !ok {
1455 history = &networkHistory{
1456 offlineClients: make(map[string]uint64),
1457 ring: NewRing(uc.srv.RingCap),
1458 }
1459 uc.network.history[entity] = history
1460
1461 for clientName, _ := range uc.network.offlineClients {
1462 history.offlineClients[clientName] = 0
1463 }
1464
1465 if detached {
1466 // If the channel is detached, online clients act as offline
1467 // clients too
1468 uc.forEachDownstream(func(dc *downstreamConn) {
1469 history.offlineClients[dc.clientName] = 0
1470 })
1471 }
1472 }
1473
1474 history.ring.Produce(msg)
1475}
1476
1477// produce appends a message to the logs, adds it to the history and forwards
1478// it to connected downstream connections.
1479//
1480// If origin is not nil and origin doesn't support echo-message, the message is
1481// forwarded to all connections except origin.
1482func (uc *upstreamConn) produce(target string, msg *irc.Message, origin *downstreamConn) {
1483 if target != "" {
1484 uc.appendLog(target, msg)
1485 }
1486
1487 uc.appendHistory(target, msg)
1488
1489 // Don't forward messages if it's a detached channel
1490 if ch, ok := uc.network.channels[target]; ok && ch.Detached {
1491 return
1492 }
1493
1494 uc.forEachDownstream(func(dc *downstreamConn) {
1495 if dc != origin || dc.caps["echo-message"] {
1496 dc.SendMessage(dc.marshalMessage(msg, uc.network))
1497 }
1498 })
1499}
1500
1501func (uc *upstreamConn) updateAway() {
1502 away := true
1503 uc.forEachDownstream(func(*downstreamConn) {
1504 away = false
1505 })
1506 if away == uc.away {
1507 return
1508 }
1509 if away {
1510 uc.SendMessage(&irc.Message{
1511 Command: "AWAY",
1512 Params: []string{"Auto away"},
1513 })
1514 } else {
1515 uc.SendMessage(&irc.Message{
1516 Command: "AWAY",
1517 })
1518 }
1519 uc.away = away
1520}
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