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source: code/trunk/upstream.go@ 461

Last change on this file since 461 was 461, checked in by contact, 4 years ago
Use upstream ISUPPORT map for NETWORK
File size: 44.5 KB

Rev	Line
[98]	1	package soju
[13]	2
	3	import (
[307]	4	"crypto"
	5	"crypto/sha256"
[13]	6	"crypto/tls"
[307]	7	"crypto/x509"
[95]	8	"encoding/base64"
[155]	9	"errors"
[13]	10	"fmt"
	11	"io"
	12	"net"
[19]	13	"strconv"
[17]	14	"strings"
[19]	15	"time"
[288]	16	"unicode"
	17	"unicode/utf8"
[13]	18
[95]	19	"github.com/emersion/go-sasl"
[13]	20	"gopkg.in/irc.v3"
	21	)
	22
[282]	23	// permanentUpstreamCaps is the static list of upstream capabilities always
	24	// requested when supported.
	25	var permanentUpstreamCaps = map[string]bool{
	26	"away-notify": true,
	27	"batch": true,
[419]	28	"extended-join": true,
[448]	29	"invite-notify": true,
[282]	30	"labeled-response": true,
	31	"message-tags": true,
[292]	32	"multi-prefix": true,
[282]	33	"server-time": true,
	34	}
	35
[399]	36	type registrationError string
	37
	38	func (err registrationError) Error() string {
	39	return fmt.Sprintf("registration error: %v", string(err))
	40	}
	41
[19]	42	type upstreamChannel struct {
[162]	43	Name string
	44	conn *upstreamConn
	45	Topic string
[405]	46	TopicWho *irc.Prefix
[162]	47	TopicTime time.Time
	48	Status channelStatus
	49	modes channelModes
	50	creationTime string
[292]	51	Members map[string]*memberships
[162]	52	complete bool
[435]	53	detachTimer *time.Timer
[19]	54	}
	55
[435]	56	func (uc *upstreamChannel) updateAutoDetach(dur time.Duration) {
	57	if uc.detachTimer != nil {
	58	uc.detachTimer.Stop()
	59	uc.detachTimer = nil
	60	}
	61
	62	if dur == 0 {
	63	return
	64	}
	65
	66	uc.detachTimer = time.AfterFunc(dur, func() {
	67	uc.conn.network.user.events <- eventChannelDetach{
	68	uc: uc.conn,
	69	name: uc.Name,
	70	}
	71	})
	72	}
	73
[13]	74	type upstreamConn struct {
[210]	75	conn
[16]	76
[210]	77	network *network
	78	user *user
	79
[16]	80	serverName string
	81	availableUserModes string
[139]	82	availableChannelModes map[byte]channelModeType
	83	availableChannelTypes string
	84	availableMemberships []membership
[460]	85	isupport map[string]*string
[19]	86
[277]	87	registered bool
	88	nick string
	89	username string
	90	realname string
	91	modes userModes
	92	channels map[string]*upstreamChannel
	93	supportedCaps map[string]string
[278]	94	caps map[string]bool
[277]	95	batches map[string]batch
	96	away bool
[278]	97	nextLabelID uint64
[95]	98
	99	saslClient sasl.Client
	100	saslStarted bool
[177]	101
	102	// set of LIST commands in progress, per downstream
	103	pendingLISTDownstreamSet map[uint64]struct{}
[13]	104	}
	105
[77]	106	func connectToUpstream(network network) (upstreamConn, error) {
	107	logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
[33]	108
[352]	109	dialer := net.Dialer{Timeout: connectTimeout}
[269]	110
[457]	111	u, err := network.URL()
[352]	112	if err != nil {
[457]	113	return nil, err
[352]	114	}
[206]	115
[269]	116	var netConn net.Conn
[352]	117	switch u.Scheme {
[269]	118	case "ircs":
[352]	119	addr := u.Host
[381]	120	host, _, err := net.SplitHostPort(u.Host)
	121	if err != nil {
	122	host = u.Host
	123	addr = u.Host + ":6697"
[269]	124	}
	125
	126	logger.Printf("connecting to TLS server at address %q", addr)
[307]	127
[455]	128	tlsConfig := &tls.Config{ServerName: host, NextProtos: []string{"irc"}}
[307]	129	if network.SASL.Mechanism == "EXTERNAL" {
	130	if network.SASL.External.CertBlob == nil {
	131	return nil, fmt.Errorf("missing certificate for authentication")
	132	}
	133	if network.SASL.External.PrivKeyBlob == nil {
	134	return nil, fmt.Errorf("missing private key for authentication")
	135	}
	136	key, err := x509.ParsePKCS8PrivateKey(network.SASL.External.PrivKeyBlob)
	137	if err != nil {
	138	return nil, fmt.Errorf("failed to parse private key: %v", err)
	139	}
[381]	140	tlsConfig.Certificates = []tls.Certificate{
	141	{
	142	Certificate: [][]byte{network.SASL.External.CertBlob},
	143	PrivateKey: key.(crypto.PrivateKey),
[307]	144	},
	145	}
	146	logger.Printf("using TLS client certificate %x", sha256.Sum256(network.SASL.External.CertBlob))
	147	}
	148
[381]	149	netConn, err = dialer.Dial("tcp", addr)
[352]	150	if err != nil {
	151	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
	152	}
[381]	153
	154	// Don't do the TLS handshake immediately, because we need to register
	155	// the new connection with identd ASAP. See:
	156	// https://todo.sr.ht/~emersion/soju/69#event-41859
	157	netConn = tls.Client(netConn, tlsConfig)
[270]	158	case "irc+insecure":
[352]	159	addr := u.Host
[351]	160	if _, _, err := net.SplitHostPort(addr); err != nil {
[270]	161	addr = addr + ":6667"
	162	}
	163
	164	logger.Printf("connecting to plain-text server at address %q", addr)
	165	netConn, err = dialer.Dial("tcp", addr)
[352]	166	if err != nil {
	167	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
	168	}
[369]	169	case "irc+unix", "unix":
[353]	170	logger.Printf("connecting to Unix socket at path %q", u.Path)
	171	netConn, err = dialer.Dial("unix", u.Path)
	172	if err != nil {
	173	return nil, fmt.Errorf("failed to connect to Unix socket %q: %v", u.Path, err)
	174	}
[269]	175	default:
[352]	176	return nil, fmt.Errorf("failed to dial %q: unknown scheme: %v", network.Addr, u.Scheme)
[269]	177	}
[33]	178
[398]	179	options := connOptions{
[402]	180	Logger: logger,
[398]	181	RateLimitDelay: upstreamMessageDelay,
	182	RateLimitBurst: upstreamMessageBurst,
	183	}
	184
[55]	185	uc := &upstreamConn{
[398]	186	conn: *newConn(network.user.srv, newNetIRCConn(netConn), &options),
[177]	187	network: network,
	188	user: network.user,
	189	channels: make(map[string]*upstreamChannel),
[277]	190	supportedCaps: make(map[string]string),
[278]	191	caps: make(map[string]bool),
[177]	192	batches: make(map[string]batch),
	193	availableChannelTypes: stdChannelTypes,
	194	availableChannelModes: stdChannelModes,
	195	availableMemberships: stdMemberships,
[460]	196	isupport: make(map[string]*string),
[177]	197	pendingLISTDownstreamSet: make(map[uint64]struct{}),
[33]	198	}
[55]	199	return uc, nil
[33]	200	}
	201
[73]	202	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
[218]	203	uc.network.forEachDownstream(f)
[73]	204	}
	205
[161]	206	func (uc upstreamConn) forEachDownstreamByID(id uint64, f func(downstreamConn)) {
[155]	207	uc.forEachDownstream(func(dc *downstreamConn) {
	208	if id != 0 && id != dc.id {
	209	return
	210	}
	211	f(dc)
	212	})
	213	}
	214
[55]	215	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
	216	ch, ok := uc.channels[name]
[19]	217	if !ok {
	218	return nil, fmt.Errorf("unknown channel %q", name)
	219	}
	220	return ch, nil
	221	}
	222
[129]	223	func (uc *upstreamConn) isChannel(entity string) bool {
[454]	224	return strings.ContainsRune(uc.availableChannelTypes, rune(entity[0]))
[129]	225	}
	226
[181]	227	func (uc upstreamConn) getPendingLIST() pendingLIST {
[177]	228	for _, pl := range uc.user.pendingLISTs {
	229	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	230	continue
	231	}
	232	return &pl
	233	}
	234	return nil
	235	}
	236
[181]	237	func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
[177]	238	found = false
	239	for i := 0; i < len(uc.user.pendingLISTs); i++ {
	240	pl := uc.user.pendingLISTs[i]
	241	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	242	continue
	243	}
	244	delete(pl.pendingCommands, uc.network.ID)
	245	if len(pl.pendingCommands) == 0 {
	246	uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
	247	i--
	248	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	249	dc.SendMessage(&irc.Message{
	250	Prefix: dc.srv.prefix(),
	251	Command: irc.RPL_LISTEND,
	252	Params: []string{dc.nick, "End of /LIST"},
	253	})
	254	})
	255	}
	256	found = true
	257	if !all {
	258	delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
	259	uc.user.forEachUpstream(func(uc *upstreamConn) {
[181]	260	uc.trySendLIST(pl.downstreamID)
[177]	261	})
	262	return
	263	}
	264	}
	265	return
	266	}
	267
[181]	268	func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
[177]	269	if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
	270	// a LIST command is already pending
	271	// we will try again when that command is completed
	272	return
	273	}
	274
	275	for _, pl := range uc.user.pendingLISTs {
	276	if pl.downstreamID != downstreamID {
	277	continue
	278	}
	279	// this is the first pending LIST command list of the downstream
	280	listCommand, ok := pl.pendingCommands[uc.network.ID]
	281	if !ok {
	282	// there is no command for this upstream in these LIST commands
	283	// do not send anything
	284	continue
	285	}
	286	// there is a command for this upstream in these LIST commands
	287	// send it now
	288
	289	uc.SendMessageLabeled(downstreamID, listCommand)
	290
	291	uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
	292	return
	293	}
	294	}
	295
[292]	296	func (uc upstreamConn) parseMembershipPrefix(s string) (ms memberships, nick string) {
	297	memberships := make(memberships, 0, 4)
	298	i := 0
[139]	299	for _, m := range uc.availableMemberships {
[292]	300	if i >= len(s) {
	301	break
[139]	302	}
[292]	303	if s[i] == m.Prefix {
	304	memberships = append(memberships, m)
	305	i++
	306	}
[139]	307	}
[292]	308	return &memberships, s[i:]
[139]	309	}
	310
[288]	311	func isWordBoundary(r rune) bool {
	312	switch r {
	313	case '-', '_', '\|':
	314	return false
	315	case '\u00A0':
	316	return true
	317	default:
	318	return !unicode.IsLetter(r) && !unicode.IsNumber(r)
	319	}
	320	}
	321
	322	func isHighlight(text, nick string) bool {
	323	for {
	324	i := strings.Index(text, nick)
	325	if i < 0 {
	326	return false
	327	}
	328
	329	// Detect word boundaries
	330	var left, right rune
	331	if i > 0 {
	332	left, _ = utf8.DecodeLastRuneInString(text[:i])
	333	}
	334	if i < len(text) {
	335	right, _ = utf8.DecodeRuneInString(text[i+len(nick):])
	336	}
	337	if isWordBoundary(left) && isWordBoundary(right) {
	338	return true
	339	}
	340
	341	text = text[i+len(nick):]
	342	}
	343	}
	344
[55]	345	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[155]	346	var label string
	347	if l, ok := msg.GetTag("label"); ok {
	348	label = l
	349	}
	350
[153]	351	var msgBatch *batch
	352	if batchName, ok := msg.GetTag("batch"); ok {
	353	b, ok := uc.batches[batchName]
	354	if !ok {
	355	return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
	356	}
	357	msgBatch = &b
[155]	358	if label == "" {
	359	label = msgBatch.Label
	360	}
[443]	361	delete(msg.Tags, "batch")
[153]	362	}
	363
[161]	364	var downstreamID uint64 = 0
[155]	365	if label != "" {
	366	var labelOffset uint64
[161]	367	n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
[155]	368	if err == nil && n < 2 {
	369	err = errors.New("not enough arguments")
	370	}
	371	if err != nil {
	372	return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
	373	}
	374	}
	375
[216]	376	if _, ok := msg.Tags["time"]; !ok {
[240]	377	msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[216]	378	}
	379
[13]	380	switch msg.Command {
	381	case "PING":
[60]	382	uc.SendMessage(&irc.Message{
[13]	383	Command: "PONG",
[68]	384	Params: msg.Params,
[60]	385	})
[33]	386	return nil
[303]	387	case "NOTICE", "PRIVMSG", "TAGMSG":
[273]	388	if msg.Prefix == nil {
	389	return fmt.Errorf("expected a prefix")
	390	}
	391
[286]	392	var entity, text string
[303]	393	if msg.Command != "TAGMSG" {
	394	if err := parseMessageParams(msg, &entity, &text); err != nil {
	395	return err
	396	}
	397	} else {
	398	if err := parseMessageParams(msg, &entity); err != nil {
	399	return err
	400	}
[286]	401	}
	402
	403	if msg.Prefix.Name == serviceNick {
	404	uc.logger.Printf("skipping %v from soju's service: %v", msg.Command, msg)
	405	break
	406	}
	407	if entity == serviceNick {
	408	uc.logger.Printf("skipping %v to soju's service: %v", msg.Command, msg)
	409	break
	410	}
	411
[171]	412	if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
[239]	413	uc.produce("", msg, nil)
[303]	414	} else { // regular user message
[217]	415	target := entity
	416	if target == uc.nick {
[178]	417	target = msg.Prefix.Name
	418	}
[287]	419
[435]	420	if ch, ok := uc.network.channels[target]; ok {
	421	if ch.Detached {
	422	uc.handleDetachedMessage(msg.Prefix.Name, text, ch)
	423	}
	424
	425	highlight := msg.Prefix.Name != uc.nick && isHighlight(text, uc.nick)
	426	if ch.DetachOn == FilterMessage \|\| ch.DetachOn == FilterDefault \|\| (ch.DetachOn == FilterHighlight && highlight) {
	427	uc.updateChannelAutoDetach(target)
	428	}
[287]	429	}
[435]	430
	431	uc.produce(target, msg, nil)
[171]	432	}
[92]	433	case "CAP":
[95]	434	var subCmd string
	435	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	436	return err
[92]	437	}
[95]	438	subCmd = strings.ToUpper(subCmd)
	439	subParams := msg.Params[2:]
	440	switch subCmd {
	441	case "LS":
	442	if len(subParams) < 1 {
	443	return newNeedMoreParamsError(msg.Command)
	444	}
[281]	445	caps := subParams[len(subParams)-1]
[95]	446	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	447
[281]	448	uc.handleSupportedCaps(caps)
[92]	449
[95]	450	if more {
	451	break // wait to receive all capabilities
	452	}
	453
[281]	454	uc.requestCaps()
[152]	455
[95]	456	if uc.requestSASL() {
	457	break // we'll send CAP END after authentication is completed
	458	}
	459
[92]	460	uc.SendMessage(&irc.Message{
	461	Command: "CAP",
	462	Params: []string{"END"},
	463	})
[95]	464	case "ACK", "NAK":
	465	if len(subParams) < 1 {
	466	return newNeedMoreParamsError(msg.Command)
	467	}
	468	caps := strings.Fields(subParams[0])
	469
	470	for _, name := range caps {
	471	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	472	return err
	473	}
	474	}
	475
[281]	476	if uc.registered {
	477	uc.forEachDownstream(func(dc *downstreamConn) {
	478	dc.updateSupportedCaps()
	479	})
	480	}
	481	case "NEW":
	482	if len(subParams) < 1 {
	483	return newNeedMoreParamsError(msg.Command)
	484	}
	485	uc.handleSupportedCaps(subParams[0])
	486	uc.requestCaps()
	487	case "DEL":
	488	if len(subParams) < 1 {
	489	return newNeedMoreParamsError(msg.Command)
	490	}
	491	caps := strings.Fields(subParams[0])
	492
	493	for _, c := range caps {
	494	delete(uc.supportedCaps, c)
	495	delete(uc.caps, c)
	496	}
	497
	498	if uc.registered {
	499	uc.forEachDownstream(func(dc *downstreamConn) {
	500	dc.updateSupportedCaps()
	501	})
	502	}
[95]	503	default:
	504	uc.logger.Printf("unhandled message: %v", msg)
[92]	505	}
[95]	506	case "AUTHENTICATE":
	507	if uc.saslClient == nil {
	508	return fmt.Errorf("received unexpected AUTHENTICATE message")
	509	}
	510
	511	// TODO: if a challenge is 400 bytes long, buffer it
	512	var challengeStr string
	513	if err := parseMessageParams(msg, &challengeStr); err != nil {
	514	uc.SendMessage(&irc.Message{
	515	Command: "AUTHENTICATE",
	516	Params: []string{"*"},
	517	})
	518	return err
	519	}
	520
	521	var challenge []byte
	522	if challengeStr != "+" {
	523	var err error
	524	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	525	if err != nil {
	526	uc.SendMessage(&irc.Message{
	527	Command: "AUTHENTICATE",
	528	Params: []string{"*"},
	529	})
	530	return err
	531	}
	532	}
	533
	534	var resp []byte
	535	var err error
	536	if !uc.saslStarted {
	537	_, resp, err = uc.saslClient.Start()
	538	uc.saslStarted = true
	539	} else {
	540	resp, err = uc.saslClient.Next(challenge)
	541	}
	542	if err != nil {
	543	uc.SendMessage(&irc.Message{
	544	Command: "AUTHENTICATE",
	545	Params: []string{"*"},
	546	})
	547	return err
	548	}
	549
	550	// TODO: send response in multiple chunks if >= 400 bytes
	551	var respStr = "+"
[318]	552	if len(resp) != 0 {
[95]	553	respStr = base64.StdEncoding.EncodeToString(resp)
	554	}
	555
	556	uc.SendMessage(&irc.Message{
	557	Command: "AUTHENTICATE",
	558	Params: []string{respStr},
	559	})
[125]	560	case irc.RPL_LOGGEDIN:
[95]	561	var account string
	562	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	563	return err
	564	}
	565	uc.logger.Printf("logged in with account %q", account)
[125]	566	case irc.RPL_LOGGEDOUT:
[95]	567	uc.logger.Printf("logged out")
[125]	568	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	569	var info string
	570	if err := parseMessageParams(msg, nil, &info); err != nil {
	571	return err
	572	}
	573	switch msg.Command {
[125]	574	case irc.ERR_NICKLOCKED:
[95]	575	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	576	case irc.ERR_SASLFAIL:
[95]	577	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	578	case irc.ERR_SASLTOOLONG:
[95]	579	uc.logger.Printf("SASL message too long: %v", info)
	580	}
	581
	582	uc.saslClient = nil
	583	uc.saslStarted = false
	584
	585	uc.SendMessage(&irc.Message{
	586	Command: "CAP",
	587	Params: []string{"END"},
	588	})
[14]	589	case irc.RPL_WELCOME:
[55]	590	uc.registered = true
	591	uc.logger.Printf("connection registered")
[19]	592
[276]	593	uc.forEachDownstream(func(dc *downstreamConn) {
	594	dc.updateSupportedCaps()
	595	})
	596
[310]	597	if len(uc.network.channels) > 0 {
[350]	598	var channels, keys []string
[310]	599	for _, ch := range uc.network.channels {
[350]	600	channels = append(channels, ch.Name)
[310]	601	keys = append(keys, ch.Key)
	602	}
[350]	603
	604	for _, msg := range join(channels, keys) {
	605	uc.SendMessage(msg)
	606	}
[19]	607	}
[16]	608	case irc.RPL_MYINFO:
[139]	609	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
[43]	610	return err
[16]	611	}
[139]	612	case irc.RPL_ISUPPORT:
	613	if err := parseMessageParams(msg, nil, nil); err != nil {
	614	return err
[16]	615	}
[139]	616	for _, token := range msg.Params[1 : len(msg.Params)-1] {
	617	parameter := token
[460]	618	var negate, hasValue bool
	619	var value string
[139]	620	if strings.HasPrefix(token, "-") {
	621	negate = true
	622	token = token[1:]
[459]	623	} else if i := strings.IndexByte(token, '='); i >= 0 {
	624	parameter = token[:i]
	625	value = token[i+1:]
[460]	626	hasValue = true
[139]	627	}
[460]	628
	629	if hasValue {
	630	uc.isupport[parameter] = &value
	631	} else if !negate {
	632	uc.isupport[parameter] = nil
	633	} else {
	634	delete(uc.isupport, parameter)
	635	}
	636
	637	if !negate && hasValue {
	638	// TODO: reset to defaults when the token is negated
[139]	639	switch parameter {
	640	case "CHANMODES":
[458]	641	if err := uc.handleChanModes(value); err != nil {
	642	return err
[139]	643	}
	644	case "CHANTYPES":
	645	uc.availableChannelTypes = value
	646	case "PREFIX":
[458]	647	if err := uc.handleMemberships(value); err != nil {
	648	return err
[139]	649	}
	650	}
	651	}
	652	}
[153]	653	case "BATCH":
	654	var tag string
	655	if err := parseMessageParams(msg, &tag); err != nil {
	656	return err
	657	}
	658
	659	if strings.HasPrefix(tag, "+") {
	660	tag = tag[1:]
	661	if _, ok := uc.batches[tag]; ok {
	662	return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
	663	}
	664	var batchType string
	665	if err := parseMessageParams(msg, nil, &batchType); err != nil {
	666	return err
	667	}
[155]	668	label := label
	669	if label == "" && msgBatch != nil {
	670	label = msgBatch.Label
	671	}
[153]	672	uc.batches[tag] = batch{
	673	Type: batchType,
	674	Params: msg.Params[2:],
	675	Outer: msgBatch,
[155]	676	Label: label,
[153]	677	}
	678	} else if strings.HasPrefix(tag, "-") {
	679	tag = tag[1:]
	680	if _, ok := uc.batches[tag]; !ok {
	681	return fmt.Errorf("unknown BATCH reference tag: %q", tag)
	682	}
	683	delete(uc.batches, tag)
	684	} else {
	685	return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
	686	}
[42]	687	case "NICK":
[83]	688	if msg.Prefix == nil {
	689	return fmt.Errorf("expected a prefix")
	690	}
	691
[43]	692	var newNick string
	693	if err := parseMessageParams(msg, &newNick); err != nil {
	694	return err
[42]	695	}
	696
[244]	697	me := false
[55]	698	if msg.Prefix.Name == uc.nick {
	699	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
[244]	700	me = true
[55]	701	uc.nick = newNick
[42]	702	}
	703
[55]	704	for _, ch := range uc.channels {
[292]	705	if memberships, ok := ch.Members[msg.Prefix.Name]; ok {
[42]	706	delete(ch.Members, msg.Prefix.Name)
[292]	707	ch.Members[newNick] = memberships
[215]	708	uc.appendLog(ch.Name, msg)
[42]	709	}
	710	}
[82]	711
[244]	712	if !me {
[82]	713	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	714	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[82]	715	})
[296]	716	} else {
	717	uc.forEachDownstream(func(dc *downstreamConn) {
	718	dc.updateNick()
	719	})
[82]	720	}
[69]	721	case "JOIN":
	722	if msg.Prefix == nil {
	723	return fmt.Errorf("expected a prefix")
	724	}
[42]	725
[43]	726	var channels string
	727	if err := parseMessageParams(msg, &channels); err != nil {
	728	return err
[19]	729	}
[34]	730
[43]	731	for _, ch := range strings.Split(channels, ",") {
[55]	732	if msg.Prefix.Name == uc.nick {
	733	uc.logger.Printf("joined channel %q", ch)
	734	uc.channels[ch] = &upstreamChannel{
[34]	735	Name: ch,
[55]	736	conn: uc,
[292]	737	Members: make(map[string]*memberships),
[34]	738	}
[435]	739	uc.updateChannelAutoDetach(ch)
[139]	740
	741	uc.SendMessage(&irc.Message{
	742	Command: "MODE",
	743	Params: []string{ch},
	744	})
[34]	745	} else {
[55]	746	ch, err := uc.getChannel(ch)
[34]	747	if err != nil {
	748	return err
	749	}
[294]	750	ch.Members[msg.Prefix.Name] = &memberships{}
[19]	751	}
[69]	752
[245]	753	chMsg := msg.Copy()
	754	chMsg.Params[0] = ch
	755	uc.produce(ch, chMsg, nil)
[19]	756	}
[69]	757	case "PART":
	758	if msg.Prefix == nil {
	759	return fmt.Errorf("expected a prefix")
	760	}
[34]	761
[43]	762	var channels string
	763	if err := parseMessageParams(msg, &channels); err != nil {
	764	return err
[34]	765	}
	766
[43]	767	for _, ch := range strings.Split(channels, ",") {
[55]	768	if msg.Prefix.Name == uc.nick {
	769	uc.logger.Printf("parted channel %q", ch)
[435]	770	if uch, ok := uc.channels[ch]; ok {
	771	delete(uc.channels, ch)
	772	uch.updateAutoDetach(0)
	773	}
[34]	774	} else {
[55]	775	ch, err := uc.getChannel(ch)
[34]	776	if err != nil {
	777	return err
	778	}
	779	delete(ch.Members, msg.Prefix.Name)
	780	}
[69]	781
[245]	782	chMsg := msg.Copy()
	783	chMsg.Params[0] = ch
	784	uc.produce(ch, chMsg, nil)
[34]	785	}
[159]	786	case "KICK":
	787	if msg.Prefix == nil {
	788	return fmt.Errorf("expected a prefix")
	789	}
	790
	791	var channel, user string
	792	if err := parseMessageParams(msg, &channel, &user); err != nil {
	793	return err
	794	}
	795
	796	if user == uc.nick {
	797	uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
	798	delete(uc.channels, channel)
	799	} else {
	800	ch, err := uc.getChannel(channel)
	801	if err != nil {
	802	return err
	803	}
	804	delete(ch.Members, user)
	805	}
	806
[245]	807	uc.produce(channel, msg, nil)
[83]	808	case "QUIT":
	809	if msg.Prefix == nil {
	810	return fmt.Errorf("expected a prefix")
	811	}
	812
	813	if msg.Prefix.Name == uc.nick {
	814	uc.logger.Printf("quit")
	815	}
	816
	817	for _, ch := range uc.channels {
[178]	818	if _, ok := ch.Members[msg.Prefix.Name]; ok {
	819	delete(ch.Members, msg.Prefix.Name)
	820
[215]	821	uc.appendLog(ch.Name, msg)
[178]	822	}
[83]	823	}
	824
	825	if msg.Prefix.Name != uc.nick {
	826	uc.forEachDownstream(func(dc *downstreamConn) {
[261]	827	dc.SendMessage(dc.marshalMessage(msg, uc.network))
[83]	828	})
	829	}
[19]	830	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	831	var name, topic string
	832	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	833	return err
[19]	834	}
[55]	835	ch, err := uc.getChannel(name)
[19]	836	if err != nil {
	837	return err
	838	}
	839	if msg.Command == irc.RPL_TOPIC {
[43]	840	ch.Topic = topic
[19]	841	} else {
	842	ch.Topic = ""
	843	}
	844	case "TOPIC":
[405]	845	if msg.Prefix == nil {
	846	return fmt.Errorf("expected a prefix")
	847	}
	848
[43]	849	var name string
[74]	850	if err := parseMessageParams(msg, &name); err != nil {
[43]	851	return err
[19]	852	}
[55]	853	ch, err := uc.getChannel(name)
[19]	854	if err != nil {
	855	return err
	856	}
	857	if len(msg.Params) > 1 {
	858	ch.Topic = msg.Params[1]
[405]	859	ch.TopicWho = msg.Prefix.Copy()
	860	ch.TopicTime = time.Now() // TODO use msg.Tags["time"]
[19]	861	} else {
	862	ch.Topic = ""
	863	}
[245]	864	uc.produce(ch.Name, msg, nil)
[139]	865	case "MODE":
	866	var name, modeStr string
	867	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	868	return err
	869	}
	870
	871	if !uc.isChannel(name) { // user mode change
	872	if name != uc.nick {
	873	return fmt.Errorf("received MODE message for unknown nick %q", name)
	874	}
	875	return uc.modes.Apply(modeStr)
	876	// TODO: notify downstreams about user mode change?
	877	} else { // channel mode change
	878	ch, err := uc.getChannel(name)
	879	if err != nil {
	880	return err
	881	}
	882
[293]	883	needMarshaling, err := applyChannelModes(ch, modeStr, msg.Params[2:])
	884	if err != nil {
	885	return err
[139]	886	}
	887
[293]	888	uc.appendLog(ch.Name, msg)
	889
[338]	890	if ch, ok := uc.network.channels[name]; !ok \|\| !ch.Detached {
	891	uc.forEachDownstream(func(dc *downstreamConn) {
	892	params := make([]string, len(msg.Params))
	893	params[0] = dc.marshalEntity(uc.network, name)
	894	params[1] = modeStr
	895
	896	copy(params[2:], msg.Params[2:])
	897	for i, modeParam := range params[2:] {
	898	if _, ok := needMarshaling[i]; ok {
	899	params[2+i] = dc.marshalEntity(uc.network, modeParam)
	900	}
[293]	901	}
	902
[338]	903	dc.SendMessage(&irc.Message{
	904	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	905	Command: "MODE",
	906	Params: params,
	907	})
[293]	908	})
[338]	909	}
[139]	910	}
	911	case irc.RPL_UMODEIS:
	912	if err := parseMessageParams(msg, nil); err != nil {
	913	return err
	914	}
	915	modeStr := ""
	916	if len(msg.Params) > 1 {
	917	modeStr = msg.Params[1]
	918	}
	919
	920	uc.modes = ""
	921	if err := uc.modes.Apply(modeStr); err != nil {
	922	return err
	923	}
	924	// TODO: send RPL_UMODEIS to downstream connections when applicable
	925	case irc.RPL_CHANNELMODEIS:
	926	var channel string
	927	if err := parseMessageParams(msg, nil, &channel); err != nil {
	928	return err
	929	}
	930	modeStr := ""
	931	if len(msg.Params) > 2 {
	932	modeStr = msg.Params[2]
	933	}
	934
	935	ch, err := uc.getChannel(channel)
	936	if err != nil {
	937	return err
	938	}
	939
	940	firstMode := ch.modes == nil
	941	ch.modes = make(map[byte]string)
[293]	942	if _, err := applyChannelModes(ch, modeStr, msg.Params[3:]); err != nil {
[139]	943	return err
	944	}
	945	if firstMode {
[338]	946	if c, ok := uc.network.channels[channel]; !ok \|\| !c.Detached {
	947	modeStr, modeParams := ch.modes.Format()
[139]	948
[338]	949	uc.forEachDownstream(func(dc *downstreamConn) {
	950	params := []string{dc.nick, dc.marshalEntity(uc.network, channel), modeStr}
	951	params = append(params, modeParams...)
[139]	952
[338]	953	dc.SendMessage(&irc.Message{
	954	Prefix: dc.srv.prefix(),
	955	Command: irc.RPL_CHANNELMODEIS,
	956	Params: params,
	957	})
[139]	958	})
[338]	959	}
[139]	960	}
[162]	961	case rpl_creationtime:
	962	var channel, creationTime string
	963	if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
	964	return err
	965	}
	966
	967	ch, err := uc.getChannel(channel)
	968	if err != nil {
	969	return err
	970	}
	971
	972	firstCreationTime := ch.creationTime == ""
	973	ch.creationTime = creationTime
	974	if firstCreationTime {
	975	uc.forEachDownstream(func(dc *downstreamConn) {
	976	dc.SendMessage(&irc.Message{
	977	Prefix: dc.srv.prefix(),
	978	Command: rpl_creationtime,
[403]	979	Params: []string{dc.nick, dc.marshalEntity(uc.network, ch.Name), creationTime},
[162]	980	})
	981	})
	982	}
[19]	983	case rpl_topicwhotime:
[43]	984	var name, who, timeStr string
	985	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	986	return err
[19]	987	}
[55]	988	ch, err := uc.getChannel(name)
[19]	989	if err != nil {
	990	return err
	991	}
[405]	992	firstTopicWhoTime := ch.TopicWho == nil
	993	ch.TopicWho = irc.ParsePrefix(who)
[43]	994	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	995	if err != nil {
	996	return fmt.Errorf("failed to parse topic time: %v", err)
	997	}
	998	ch.TopicTime = time.Unix(sec, 0)
[405]	999	if firstTopicWhoTime {
	1000	uc.forEachDownstream(func(dc *downstreamConn) {
	1001	topicWho := dc.marshalUserPrefix(uc.network, ch.TopicWho)
	1002	dc.SendMessage(&irc.Message{
	1003	Prefix: dc.srv.prefix(),
	1004	Command: rpl_topicwhotime,
	1005	Params: []string{
	1006	dc.nick,
	1007	dc.marshalEntity(uc.network, ch.Name),
	1008	topicWho.String(),
	1009	timeStr,
	1010	},
	1011	})
	1012	})
	1013	}
[177]	1014	case irc.RPL_LIST:
	1015	var channel, clients, topic string
	1016	if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
	1017	return err
	1018	}
	1019
[181]	1020	pl := uc.getPendingLIST()
[177]	1021	if pl == nil {
	1022	return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
	1023	}
	1024
	1025	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	1026	dc.SendMessage(&irc.Message{
	1027	Prefix: dc.srv.prefix(),
	1028	Command: irc.RPL_LIST,
[260]	1029	Params: []string{dc.nick, dc.marshalEntity(uc.network, channel), clients, topic},
[177]	1030	})
	1031	})
	1032	case irc.RPL_LISTEND:
[181]	1033	ok := uc.endPendingLISTs(false)
[177]	1034	if !ok {
	1035	return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
	1036	}
[19]	1037	case irc.RPL_NAMREPLY:
[43]	1038	var name, statusStr, members string
	1039	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	1040	return err
[19]	1041	}
[140]	1042
	1043	ch, ok := uc.channels[name]
	1044	if !ok {
	1045	// NAMES on a channel we have not joined, forward to downstream
[161]	1046	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1047	channel := dc.marshalEntity(uc.network, name)
[174]	1048	members := splitSpace(members)
[140]	1049	for i, member := range members {
[292]	1050	memberships, nick := uc.parseMembershipPrefix(member)
	1051	members[i] = memberships.Format(dc) + dc.marshalEntity(uc.network, nick)
[140]	1052	}
	1053	memberStr := strings.Join(members, " ")
	1054
	1055	dc.SendMessage(&irc.Message{
	1056	Prefix: dc.srv.prefix(),
	1057	Command: irc.RPL_NAMREPLY,
	1058	Params: []string{dc.nick, statusStr, channel, memberStr},
	1059	})
	1060	})
	1061	return nil
[19]	1062	}
	1063
[43]	1064	status, err := parseChannelStatus(statusStr)
[19]	1065	if err != nil {
	1066	return err
	1067	}
	1068	ch.Status = status
	1069
[174]	1070	for _, s := range splitSpace(members) {
[292]	1071	memberships, nick := uc.parseMembershipPrefix(s)
	1072	ch.Members[nick] = memberships
[19]	1073	}
	1074	case irc.RPL_ENDOFNAMES:
[43]	1075	var name string
	1076	if err := parseMessageParams(msg, nil, &name); err != nil {
	1077	return err
[25]	1078	}
[140]	1079
	1080	ch, ok := uc.channels[name]
	1081	if !ok {
	1082	// NAMES on a channel we have not joined, forward to downstream
[161]	1083	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1084	channel := dc.marshalEntity(uc.network, name)
[140]	1085
	1086	dc.SendMessage(&irc.Message{
	1087	Prefix: dc.srv.prefix(),
	1088	Command: irc.RPL_ENDOFNAMES,
	1089	Params: []string{dc.nick, channel, "End of /NAMES list"},
	1090	})
	1091	})
	1092	return nil
[25]	1093	}
	1094
[34]	1095	if ch.complete {
	1096	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	1097	}
[25]	1098	ch.complete = true
[27]	1099
[338]	1100	if c, ok := uc.network.channels[name]; !ok \|\| !c.Detached {
	1101	uc.forEachDownstream(func(dc *downstreamConn) {
	1102	forwardChannel(dc, ch)
	1103	})
	1104	}
[127]	1105	case irc.RPL_WHOREPLY:
	1106	var channel, username, host, server, nick, mode, trailing string
	1107	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	1108	return err
	1109	}
	1110
	1111	parts := strings.SplitN(trailing, " ", 2)
	1112	if len(parts) != 2 {
	1113	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	1114	}
	1115	realname := parts[1]
	1116	hops, err := strconv.Atoi(parts[0])
	1117	if err != nil {
	1118	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	1119	}
	1120	hops++
	1121
	1122	trailing = strconv.Itoa(hops) + " " + realname
	1123
[161]	1124	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1125	channel := channel
	1126	if channel != "*" {
[260]	1127	channel = dc.marshalEntity(uc.network, channel)
[127]	1128	}
[260]	1129	nick := dc.marshalEntity(uc.network, nick)
[127]	1130	dc.SendMessage(&irc.Message{
	1131	Prefix: dc.srv.prefix(),
	1132	Command: irc.RPL_WHOREPLY,
	1133	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	1134	})
	1135	})
	1136	case irc.RPL_ENDOFWHO:
	1137	var name string
	1138	if err := parseMessageParams(msg, nil, &name); err != nil {
	1139	return err
	1140	}
	1141
[161]	1142	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1143	name := name
	1144	if name != "*" {
	1145	// TODO: support WHO masks
[260]	1146	name = dc.marshalEntity(uc.network, name)
[127]	1147	}
	1148	dc.SendMessage(&irc.Message{
	1149	Prefix: dc.srv.prefix(),
	1150	Command: irc.RPL_ENDOFWHO,
[142]	1151	Params: []string{dc.nick, name, "End of /WHO list"},
[127]	1152	})
	1153	})
[128]	1154	case irc.RPL_WHOISUSER:
	1155	var nick, username, host, realname string
	1156	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	1157	return err
	1158	}
	1159
[161]	1160	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1161	nick := dc.marshalEntity(uc.network, nick)
[128]	1162	dc.SendMessage(&irc.Message{
	1163	Prefix: dc.srv.prefix(),
	1164	Command: irc.RPL_WHOISUSER,
	1165	Params: []string{dc.nick, nick, username, host, "*", realname},
	1166	})
	1167	})
	1168	case irc.RPL_WHOISSERVER:
	1169	var nick, server, serverInfo string
	1170	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	1171	return err
	1172	}
	1173
[161]	1174	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1175	nick := dc.marshalEntity(uc.network, nick)
[128]	1176	dc.SendMessage(&irc.Message{
	1177	Prefix: dc.srv.prefix(),
	1178	Command: irc.RPL_WHOISSERVER,
	1179	Params: []string{dc.nick, nick, server, serverInfo},
	1180	})
	1181	})
	1182	case irc.RPL_WHOISOPERATOR:
	1183	var nick string
	1184	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1185	return err
	1186	}
	1187
[161]	1188	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1189	nick := dc.marshalEntity(uc.network, nick)
[128]	1190	dc.SendMessage(&irc.Message{
	1191	Prefix: dc.srv.prefix(),
	1192	Command: irc.RPL_WHOISOPERATOR,
	1193	Params: []string{dc.nick, nick, "is an IRC operator"},
	1194	})
	1195	})
	1196	case irc.RPL_WHOISIDLE:
	1197	var nick string
	1198	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	1199	return err
	1200	}
	1201
[161]	1202	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1203	nick := dc.marshalEntity(uc.network, nick)
[128]	1204	params := []string{dc.nick, nick}
	1205	params = append(params, msg.Params[2:]...)
	1206	dc.SendMessage(&irc.Message{
	1207	Prefix: dc.srv.prefix(),
	1208	Command: irc.RPL_WHOISIDLE,
	1209	Params: params,
	1210	})
	1211	})
	1212	case irc.RPL_WHOISCHANNELS:
	1213	var nick, channelList string
	1214	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	1215	return err
	1216	}
[174]	1217	channels := splitSpace(channelList)
[128]	1218
[161]	1219	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1220	nick := dc.marshalEntity(uc.network, nick)
[128]	1221	channelList := make([]string, len(channels))
	1222	for i, channel := range channels {
[139]	1223	prefix, channel := uc.parseMembershipPrefix(channel)
[260]	1224	channel = dc.marshalEntity(uc.network, channel)
[292]	1225	channelList[i] = prefix.Format(dc) + channel
[128]	1226	}
	1227	channels := strings.Join(channelList, " ")
	1228	dc.SendMessage(&irc.Message{
	1229	Prefix: dc.srv.prefix(),
	1230	Command: irc.RPL_WHOISCHANNELS,
	1231	Params: []string{dc.nick, nick, channels},
	1232	})
	1233	})
	1234	case irc.RPL_ENDOFWHOIS:
	1235	var nick string
	1236	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1237	return err
	1238	}
	1239
[161]	1240	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[260]	1241	nick := dc.marshalEntity(uc.network, nick)
[128]	1242	dc.SendMessage(&irc.Message{
	1243	Prefix: dc.srv.prefix(),
	1244	Command: irc.RPL_ENDOFWHOIS,
[142]	1245	Params: []string{dc.nick, nick, "End of /WHOIS list"},
[128]	1246	})
	1247	})
[115]	1248	case "INVITE":
[273]	1249	var nick, channel string
[115]	1250	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1251	return err
	1252	}
	1253
[448]	1254	weAreInvited := nick == uc.nick
	1255
[115]	1256	uc.forEachDownstream(func(dc *downstreamConn) {
[448]	1257	if !weAreInvited && !dc.caps["invite-notify"] {
	1258	return
	1259	}
[115]	1260	dc.SendMessage(&irc.Message{
[260]	1261	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
[115]	1262	Command: "INVITE",
[260]	1263	Params: []string{dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[115]	1264	})
	1265	})
[163]	1266	case irc.RPL_INVITING:
[273]	1267	var nick, channel string
[304]	1268	if err := parseMessageParams(msg, nil, &nick, &channel); err != nil {
[163]	1269	return err
	1270	}
	1271
	1272	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1273	dc.SendMessage(&irc.Message{
	1274	Prefix: dc.srv.prefix(),
	1275	Command: irc.RPL_INVITING,
[260]	1276	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), dc.marshalEntity(uc.network, channel)},
[163]	1277	})
	1278	})
[272]	1279	case irc.RPL_AWAY:
	1280	var nick, reason string
	1281	if err := parseMessageParams(msg, nil, &nick, &reason); err != nil {
	1282	return err
	1283	}
	1284
[274]	1285	uc.forEachDownstream(func(dc *downstreamConn) {
[272]	1286	dc.SendMessage(&irc.Message{
	1287	Prefix: dc.srv.prefix(),
	1288	Command: irc.RPL_AWAY,
	1289	Params: []string{dc.nick, dc.marshalEntity(uc.network, nick), reason},
	1290	})
	1291	})
[276]	1292	case "AWAY":
	1293	if msg.Prefix == nil {
	1294	return fmt.Errorf("expected a prefix")
	1295	}
	1296
	1297	uc.forEachDownstream(func(dc *downstreamConn) {
	1298	if !dc.caps["away-notify"] {
	1299	return
	1300	}
	1301	dc.SendMessage(&irc.Message{
	1302	Prefix: dc.marshalUserPrefix(uc.network, msg.Prefix),
	1303	Command: "AWAY",
	1304	Params: msg.Params,
	1305	})
	1306	})
[300]	1307	case irc.RPL_BANLIST, irc.RPL_INVITELIST, irc.RPL_EXCEPTLIST:
	1308	var channel, mask string
	1309	if err := parseMessageParams(msg, nil, &channel, &mask); err != nil {
	1310	return err
	1311	}
	1312	var addNick, addTime string
	1313	if len(msg.Params) >= 5 {
	1314	addNick = msg.Params[3]
	1315	addTime = msg.Params[4]
	1316	}
	1317
	1318	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1319	channel := dc.marshalEntity(uc.network, channel)
	1320
	1321	var params []string
	1322	if addNick != "" && addTime != "" {
	1323	addNick := dc.marshalEntity(uc.network, addNick)
	1324	params = []string{dc.nick, channel, mask, addNick, addTime}
	1325	} else {
	1326	params = []string{dc.nick, channel, mask}
	1327	}
	1328
	1329	dc.SendMessage(&irc.Message{
	1330	Prefix: dc.srv.prefix(),
	1331	Command: msg.Command,
	1332	Params: params,
	1333	})
	1334	})
	1335	case irc.RPL_ENDOFBANLIST, irc.RPL_ENDOFINVITELIST, irc.RPL_ENDOFEXCEPTLIST:
	1336	var channel, trailing string
	1337	if err := parseMessageParams(msg, nil, &channel, &trailing); err != nil {
	1338	return err
	1339	}
	1340
	1341	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1342	upstreamChannel := dc.marshalEntity(uc.network, channel)
	1343	dc.SendMessage(&irc.Message{
	1344	Prefix: dc.srv.prefix(),
	1345	Command: msg.Command,
	1346	Params: []string{dc.nick, upstreamChannel, trailing},
	1347	})
	1348	})
[302]	1349	case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
	1350	var command, reason string
	1351	if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
	1352	return err
	1353	}
	1354
	1355	if command == "LIST" {
	1356	ok := uc.endPendingLISTs(false)
	1357	if !ok {
	1358	return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
	1359	}
	1360	}
	1361
[355]	1362	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1363	dc.SendMessage(&irc.Message{
	1364	Prefix: uc.srv.prefix(),
	1365	Command: msg.Command,
	1366	Params: []string{dc.nick, command, reason},
[302]	1367	})
[355]	1368	})
[155]	1369	case "ACK":
	1370	// Ignore
[198]	1371	case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
	1372	// Ignore
[16]	1373	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	1374	// Ignore
	1375	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	1376	// Ignore
	1377	case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
	1378	// Ignore
[177]	1379	case irc.RPL_LISTSTART:
	1380	// Ignore
[14]	1381	case rpl_localusers, rpl_globalusers:
	1382	// Ignore
[96]	1383	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	1384	// Ignore
[390]	1385	case "ERROR":
	1386	var text string
	1387	if err := parseMessageParams(msg, &text); err != nil {
	1388	return err
	1389	}
	1390	return fmt.Errorf("fatal server error: %v", text)
[389]	1391	case irc.ERR_PASSWDMISMATCH, irc.ERR_ERRONEUSNICKNAME, irc.ERR_NICKNAMEINUSE, irc.ERR_NICKCOLLISION, irc.ERR_UNAVAILRESOURCE, irc.ERR_NOPERMFORHOST, irc.ERR_YOUREBANNEDCREEP:
[342]	1392	if !uc.registered {
[399]	1393	text := msg.Params[len(msg.Params)-1]
	1394	return registrationError(text)
[342]	1395	}
	1396	fallthrough
[13]	1397	default:
[95]	1398	uc.logger.Printf("unhandled message: %v", msg)
[355]	1399
	1400	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1401	// best effort marshaling for unknown messages, replies and errors:
	1402	// most numerics start with the user nick, marshal it if that's the case
	1403	// otherwise, conservately keep the params without marshaling
	1404	params := msg.Params
	1405	if _, err := strconv.Atoi(msg.Command); err == nil { // numeric
	1406	if len(msg.Params) > 0 && isOurNick(uc.network, msg.Params[0]) {
	1407	params[0] = dc.nick
[302]	1408	}
[355]	1409	}
	1410	dc.SendMessage(&irc.Message{
	1411	Prefix: uc.srv.prefix(),
	1412	Command: msg.Command,
	1413	Params: params,
[302]	1414	})
[355]	1415	})
[13]	1416	}
[14]	1417	return nil
[13]	1418	}
	1419
[435]	1420	func (uc upstreamConn) handleDetachedMessage(sender string, text string, ch Channel) {
	1421	highlight := sender != uc.nick && isHighlight(text, uc.nick)
	1422	if ch.RelayDetached == FilterMessage \|\| ((ch.RelayDetached == FilterHighlight \|\| ch.RelayDetached == FilterDefault) && highlight) {
	1423	uc.forEachDownstream(func(dc *downstreamConn) {
	1424	if highlight {
	1425	sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
	1426	} else {
	1427	sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(uc.network, ch.Name), sender, text))
	1428	}
	1429	})
	1430	}
	1431	if ch.ReattachOn == FilterMessage \|\| (ch.ReattachOn == FilterHighlight && highlight) {
	1432	uc.network.attach(ch)
	1433	if err := uc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
	1434	uc.logger.Printf("failed to update channel %q: %v", ch.Name, err)
	1435	}
	1436	}
	1437	}
	1438
[458]	1439	func (uc *upstreamConn) handleChanModes(s string) error {
	1440	parts := strings.SplitN(s, ",", 5)
	1441	if len(parts) < 4 {
	1442	return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", s)
	1443	}
	1444	modes := make(map[byte]channelModeType)
	1445	for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
	1446	for j := 0; j < len(parts[i]); j++ {
	1447	mode := parts[i][j]
	1448	modes[mode] = mt
	1449	}
	1450	}
	1451	uc.availableChannelModes = modes
	1452	return nil
	1453	}
	1454
	1455	func (uc *upstreamConn) handleMemberships(s string) error {
	1456	if s == "" {
	1457	uc.availableMemberships = nil
	1458	return nil
	1459	}
	1460
	1461	if s[0] != '(' {
	1462	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
	1463	}
	1464	sep := strings.IndexByte(s, ')')
	1465	if sep < 0 \|\| len(s) != sep*2 {
	1466	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", s)
	1467	}
	1468	memberships := make([]membership, len(s)/2-1)
	1469	for i := range memberships {
	1470	memberships[i] = membership{
	1471	Mode: s[i+1],
	1472	Prefix: s[sep+i+1],
	1473	}
	1474	}
	1475	uc.availableMemberships = memberships
	1476	return nil
	1477	}
	1478
[281]	1479	func (uc *upstreamConn) handleSupportedCaps(capsStr string) {
	1480	caps := strings.Fields(capsStr)
	1481	for _, s := range caps {
	1482	kv := strings.SplitN(s, "=", 2)
	1483	k := strings.ToLower(kv[0])
	1484	var v string
	1485	if len(kv) == 2 {
	1486	v = kv[1]
	1487	}
	1488	uc.supportedCaps[k] = v
	1489	}
	1490	}
	1491
	1492	func (uc *upstreamConn) requestCaps() {
	1493	var requestCaps []string
[282]	1494	for c := range permanentUpstreamCaps {
[281]	1495	if _, ok := uc.supportedCaps[c]; ok && !uc.caps[c] {
	1496	requestCaps = append(requestCaps, c)
	1497	}
	1498	}
	1499
	1500	if uc.requestSASL() && !uc.caps["sasl"] {
	1501	requestCaps = append(requestCaps, "sasl")
	1502	}
	1503
[282]	1504	if len(requestCaps) == 0 {
	1505	return
	1506	}
	1507
	1508	uc.SendMessage(&irc.Message{
	1509	Command: "CAP",
	1510	Params: []string{"REQ", strings.Join(requestCaps, " ")},
	1511	})
	1512	}
	1513
	1514	func (uc *upstreamConn) requestSASL() bool {
	1515	if uc.network.SASL.Mechanism == "" {
	1516	return false
	1517	}
	1518
	1519	v, ok := uc.supportedCaps["sasl"]
	1520	if !ok {
	1521	return false
	1522	}
	1523	if v != "" {
	1524	mechanisms := strings.Split(v, ",")
	1525	found := false
	1526	for _, mech := range mechanisms {
	1527	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	1528	found = true
	1529	break
	1530	}
	1531	}
	1532	if !found {
	1533	return false
	1534	}
	1535	}
	1536
	1537	return true
	1538	}
	1539
	1540	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	1541	uc.caps[name] = ok
	1542
	1543	switch name {
	1544	case "sasl":
	1545	if !ok {
	1546	uc.logger.Printf("server refused to acknowledge the SASL capability")
	1547	return nil
	1548	}
	1549
	1550	auth := &uc.network.SASL
	1551	switch auth.Mechanism {
	1552	case "PLAIN":
	1553	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	1554	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
[307]	1555	case "EXTERNAL":
	1556	uc.logger.Printf("starting SASL EXTERNAL authentication")
	1557	uc.saslClient = sasl.NewExternalClient("")
[282]	1558	default:
	1559	return fmt.Errorf("unsupported SASL mechanism %q", name)
	1560	}
	1561
[281]	1562	uc.SendMessage(&irc.Message{
[282]	1563	Command: "AUTHENTICATE",
	1564	Params: []string{auth.Mechanism},
[281]	1565	})
[282]	1566	default:
	1567	if permanentUpstreamCaps[name] {
	1568	break
	1569	}
	1570	uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
[281]	1571	}
[282]	1572	return nil
[281]	1573	}
	1574
[174]	1575	func splitSpace(s string) []string {
	1576	return strings.FieldsFunc(s, func(r rune) bool {
	1577	return r == ' '
	1578	})
	1579	}
	1580
[55]	1581	func (uc *upstreamConn) register() {
[77]	1582	uc.nick = uc.network.Nick
[457]	1583	uc.username = uc.network.GetUsername()
	1584	uc.realname = uc.network.GetRealname()
[77]	1585
[60]	1586	uc.SendMessage(&irc.Message{
[92]	1587	Command: "CAP",
	1588	Params: []string{"LS", "302"},
	1589	})
	1590
[93]	1591	if uc.network.Pass != "" {
	1592	uc.SendMessage(&irc.Message{
	1593	Command: "PASS",
	1594	Params: []string{uc.network.Pass},
	1595	})
	1596	}
	1597
[92]	1598	uc.SendMessage(&irc.Message{
[13]	1599	Command: "NICK",
[69]	1600	Params: []string{uc.nick},
[60]	1601	})
	1602	uc.SendMessage(&irc.Message{
[13]	1603	Command: "USER",
[77]	1604	Params: []string{uc.username, "0", "*", uc.realname},
[60]	1605	})
[44]	1606	}
[13]	1607
[197]	1608	func (uc *upstreamConn) runUntilRegistered() error {
	1609	for !uc.registered {
[212]	1610	msg, err := uc.ReadMessage()
[197]	1611	if err != nil {
	1612	return fmt.Errorf("failed to read message: %v", err)
	1613	}
	1614
	1615	if err := uc.handleMessage(msg); err != nil {
[399]	1616	if _, ok := err.(registrationError); ok {
	1617	return err
	1618	} else {
	1619	msg.Tags = nil // prevent message tags from cluttering logs
	1620	return fmt.Errorf("failed to handle message %q: %v", msg, err)
	1621	}
[197]	1622	}
	1623	}
	1624
[263]	1625	for _, command := range uc.network.ConnectCommands {
	1626	m, err := irc.ParseMessage(command)
	1627	if err != nil {
	1628	uc.logger.Printf("failed to parse connect command %q: %v", command, err)
	1629	} else {
	1630	uc.SendMessage(m)
	1631	}
	1632	}
	1633
[197]	1634	return nil
	1635	}
	1636
[165]	1637	func (uc *upstreamConn) readMessages(ch chan<- event) error {
[13]	1638	for {
[210]	1639	msg, err := uc.ReadMessage()
[13]	1640	if err == io.EOF {
	1641	break
	1642	} else if err != nil {
	1643	return fmt.Errorf("failed to read IRC command: %v", err)
	1644	}
	1645
[165]	1646	ch <- eventUpstreamMessage{msg, uc}
[13]	1647	}
	1648
[45]	1649	return nil
[13]	1650	}
[60]	1651
[303]	1652	func (uc upstreamConn) SendMessage(msg irc.Message) {
	1653	if !uc.caps["message-tags"] {
	1654	msg = msg.Copy()
	1655	msg.Tags = nil
	1656	}
	1657
	1658	uc.conn.SendMessage(msg)
	1659	}
	1660
[176]	1661	func (uc upstreamConn) SendMessageLabeled(downstreamID uint64, msg irc.Message) {
[278]	1662	if uc.caps["labeled-response"] {
[155]	1663	if msg.Tags == nil {
	1664	msg.Tags = make(map[string]irc.TagValue)
	1665	}
[176]	1666	msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
[161]	1667	uc.nextLabelID++
[155]	1668	}
	1669	uc.SendMessage(msg)
	1670	}
[178]	1671
[428]	1672	// appendLog appends a message to the log file.
	1673	//
	1674	// The internal message ID is returned. If the message isn't recorded in the
	1675	// log file, an empty string is returned.
	1676	func (uc upstreamConn) appendLog(entity string, msg irc.Message) (msgID string) {
[423]	1677	if uc.user.msgStore == nil {
[428]	1678	return ""
[178]	1679	}
[215]	1680
[284]	1681	detached := false
	1682	if ch, ok := uc.network.channels[entity]; ok {
	1683	detached = ch.Detached
	1684	}
	1685
[451]	1686	delivered, ok := uc.network.delivered[entity]
[253]	1687	if !ok {
[423]	1688	lastID, err := uc.user.msgStore.LastMsgID(uc.network, entity, time.Now())
[409]	1689	if err != nil {
	1690	uc.logger.Printf("failed to log message: failed to get last message ID: %v", err)
[428]	1691	return ""
[409]	1692	}
	1693
[451]	1694	delivered = make(map[string]string)
	1695	uc.network.delivered[entity] = delivered
[253]	1696
	1697	for clientName, _ := range uc.network.offlineClients {
[451]	1698	delivered[clientName] = lastID
[253]	1699	}
[284]	1700
	1701	if detached {
	1702	// If the channel is detached, online clients act as offline
	1703	// clients too
	1704	uc.forEachDownstream(func(dc *downstreamConn) {
[451]	1705	delivered[dc.clientName] = lastID
[284]	1706	})
	1707	}
[253]	1708	}
	1709
[423]	1710	msgID, err := uc.user.msgStore.Append(uc.network, entity, msg)
[409]	1711	if err != nil {
	1712	uc.logger.Printf("failed to log message: %v", err)
[428]	1713	return ""
[409]	1714	}
[406]	1715
[428]	1716	return msgID
[253]	1717	}
	1718
[409]	1719	// produce appends a message to the logs and forwards it to connected downstream
	1720	// connections.
[245]	1721	//
	1722	// If origin is not nil and origin doesn't support echo-message, the message is
	1723	// forwarded to all connections except origin.
[239]	1724	func (uc upstreamConn) produce(target string, msg irc.Message, origin *downstreamConn) {
[428]	1725	var msgID string
[239]	1726	if target != "" {
[428]	1727	msgID = uc.appendLog(target, msg)
[239]	1728	}
	1729
[284]	1730	// Don't forward messages if it's a detached channel
	1731	if ch, ok := uc.network.channels[target]; ok && ch.Detached {
	1732	return
	1733	}
	1734
[227]	1735	uc.forEachDownstream(func(dc *downstreamConn) {
[238]	1736	if dc != origin \|\| dc.caps["echo-message"] {
[428]	1737	dc.sendMessageWithID(dc.marshalMessage(msg, uc.network), msgID)
	1738	} else {
	1739	dc.advanceMessageWithID(msg, msgID)
[238]	1740	}
[227]	1741	})
[226]	1742	}
	1743
[198]	1744	func (uc *upstreamConn) updateAway() {
	1745	away := true
	1746	uc.forEachDownstream(func(*downstreamConn) {
	1747	away = false
	1748	})
	1749	if away == uc.away {
	1750	return
	1751	}
	1752	if away {
	1753	uc.SendMessage(&irc.Message{
	1754	Command: "AWAY",
	1755	Params: []string{"Auto away"},
	1756	})
	1757	} else {
	1758	uc.SendMessage(&irc.Message{
	1759	Command: "AWAY",
	1760	})
	1761	}
	1762	uc.away = away
	1763	}
[435]	1764
	1765	func (uc *upstreamConn) updateChannelAutoDetach(name string) {
	1766	if uch, ok := uc.channels[name]; ok {
	1767	if ch, ok := uc.network.channels[name]; ok && !ch.Detached {
	1768	uch.updateAutoDetach(ch.DetachAfter)
	1769	}
	1770	}
	1771	}

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