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source: code/trunk/upstream.go@ 305

Last change on this file since 305 was 305, checked in by ecs, 5 years ago
Join all channels with a single JOIN message
File size: 39.8 KB

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

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