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source: code/trunk/upstream.go@ 252

Last change on this file since 252 was 248, checked in by contact, 5 years ago

Make newMessageLogger take a *network instead of an *upstreamConn

There's no reason why messgeLogger needs access to the whole connection,
the network is enough.

File size: 32.7 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"
[13]	13
[95]	14	"github.com/emersion/go-sasl"
[13]	15	"gopkg.in/irc.v3"
	16	)
	17
[19]	18	type upstreamChannel struct {
[162]	19	Name string
	20	conn *upstreamConn
	21	Topic string
	22	TopicWho string
	23	TopicTime time.Time
	24	Status channelStatus
	25	modes channelModes
	26	creationTime string
	27	Members map[string]*membership
	28	complete bool
[19]	29	}
	30
[13]	31	type upstreamConn struct {
[210]	32	conn
[16]	33
[210]	34	network *network
	35	user *user
	36
[16]	37	serverName string
	38	availableUserModes string
[139]	39	availableChannelModes map[byte]channelModeType
	40	availableChannelTypes string
	41	availableMemberships []membership
[19]	42
	43	registered bool
[42]	44	nick string
[77]	45	username string
	46	realname string
[139]	47	modes userModes
[19]	48	channels map[string]*upstreamChannel
[92]	49	caps map[string]string
[153]	50	batches map[string]batch
[198]	51	away bool
[95]	52
[155]	53	tagsSupported bool
	54	labelsSupported bool
[161]	55	nextLabelID uint64
[152]	56
[95]	57	saslClient sasl.Client
	58	saslStarted bool
[177]	59
	60	// set of LIST commands in progress, per downstream
	61	pendingLISTDownstreamSet map[uint64]struct{}
[178]	62
[215]	63	messageLoggers map[string]*messageLogger
[13]	64	}
	65
[77]	66	func connectToUpstream(network network) (upstreamConn, error) {
	67	logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
[33]	68
[77]	69	addr := network.Addr
	70	if !strings.ContainsRune(addr, ':') {
	71	addr = addr + ":6697"
	72	}
	73
[206]	74	dialer := net.Dialer{Timeout: connectTimeout}
	75
[77]	76	logger.Printf("connecting to TLS server at address %q", addr)
[206]	77	netConn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
[33]	78	if err != nil {
[77]	79	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
[33]	80	}
	81
[55]	82	uc := &upstreamConn{
[210]	83	conn: *newConn(network.user.srv, netConn, logger),
[177]	84	network: network,
	85	user: network.user,
	86	channels: make(map[string]*upstreamChannel),
	87	caps: make(map[string]string),
	88	batches: make(map[string]batch),
	89	availableChannelTypes: stdChannelTypes,
	90	availableChannelModes: stdChannelModes,
	91	availableMemberships: stdMemberships,
	92	pendingLISTDownstreamSet: make(map[uint64]struct{}),
[215]	93	messageLoggers: make(map[string]*messageLogger),
[33]	94	}
	95
[55]	96	return uc, nil
[33]	97	}
	98
[73]	99	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
[218]	100	uc.network.forEachDownstream(f)
[73]	101	}
	102
[161]	103	func (uc upstreamConn) forEachDownstreamByID(id uint64, f func(downstreamConn)) {
[155]	104	uc.forEachDownstream(func(dc *downstreamConn) {
	105	if id != 0 && id != dc.id {
	106	return
	107	}
	108	f(dc)
	109	})
	110	}
	111
[55]	112	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
	113	ch, ok := uc.channels[name]
[19]	114	if !ok {
	115	return nil, fmt.Errorf("unknown channel %q", name)
	116	}
	117	return ch, nil
	118	}
	119
[129]	120	func (uc *upstreamConn) isChannel(entity string) bool {
[139]	121	if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
	122	return true
[129]	123	}
	124	return false
	125	}
	126
[181]	127	func (uc upstreamConn) getPendingLIST() pendingLIST {
[177]	128	for _, pl := range uc.user.pendingLISTs {
	129	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	130	continue
	131	}
	132	return &pl
	133	}
	134	return nil
	135	}
	136
[181]	137	func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
[177]	138	found = false
	139	for i := 0; i < len(uc.user.pendingLISTs); i++ {
	140	pl := uc.user.pendingLISTs[i]
	141	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	142	continue
	143	}
	144	delete(pl.pendingCommands, uc.network.ID)
	145	if len(pl.pendingCommands) == 0 {
	146	uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
	147	i--
	148	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	149	dc.SendMessage(&irc.Message{
	150	Prefix: dc.srv.prefix(),
	151	Command: irc.RPL_LISTEND,
	152	Params: []string{dc.nick, "End of /LIST"},
	153	})
	154	})
	155	}
	156	found = true
	157	if !all {
	158	delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
	159	uc.user.forEachUpstream(func(uc *upstreamConn) {
[181]	160	uc.trySendLIST(pl.downstreamID)
[177]	161	})
	162	return
	163	}
	164	}
	165	return
	166	}
	167
[181]	168	func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
[177]	169	if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
	170	// a LIST command is already pending
	171	// we will try again when that command is completed
	172	return
	173	}
	174
	175	for _, pl := range uc.user.pendingLISTs {
	176	if pl.downstreamID != downstreamID {
	177	continue
	178	}
	179	// this is the first pending LIST command list of the downstream
	180	listCommand, ok := pl.pendingCommands[uc.network.ID]
	181	if !ok {
	182	// there is no command for this upstream in these LIST commands
	183	// do not send anything
	184	continue
	185	}
	186	// there is a command for this upstream in these LIST commands
	187	// send it now
	188
	189	uc.SendMessageLabeled(downstreamID, listCommand)
	190
	191	uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
	192	return
	193	}
	194	}
	195
[139]	196	func (uc upstreamConn) parseMembershipPrefix(s string) (membership membership, nick string) {
	197	for _, m := range uc.availableMemberships {
	198	if m.Prefix == s[0] {
	199	return &m, s[1:]
	200	}
	201	}
	202	return nil, s
	203	}
	204
[55]	205	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[155]	206	var label string
	207	if l, ok := msg.GetTag("label"); ok {
	208	label = l
	209	}
	210
[153]	211	var msgBatch *batch
	212	if batchName, ok := msg.GetTag("batch"); ok {
	213	b, ok := uc.batches[batchName]
	214	if !ok {
	215	return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
	216	}
	217	msgBatch = &b
[155]	218	if label == "" {
	219	label = msgBatch.Label
	220	}
[153]	221	}
	222
[161]	223	var downstreamID uint64 = 0
[155]	224	if label != "" {
	225	var labelOffset uint64
[161]	226	n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
[155]	227	if err == nil && n < 2 {
	228	err = errors.New("not enough arguments")
	229	}
	230	if err != nil {
	231	return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
	232	}
	233	}
	234
[216]	235	if _, ok := msg.Tags["time"]; !ok {
[240]	236	msg.Tags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[216]	237	}
	238
[13]	239	switch msg.Command {
	240	case "PING":
[60]	241	uc.SendMessage(&irc.Message{
[13]	242	Command: "PONG",
[68]	243	Params: msg.Params,
[60]	244	})
[33]	245	return nil
[18]	246	case "NOTICE":
[171]	247	if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
[239]	248	uc.produce("", msg, nil)
[171]	249	} else { // regular user NOTICE
[217]	250	var entity, text string
	251	if err := parseMessageParams(msg, &entity, &text); err != nil {
[171]	252	return err
	253	}
	254
[217]	255	target := entity
	256	if target == uc.nick {
[178]	257	target = msg.Prefix.Name
	258	}
[239]	259	uc.produce(target, msg, nil)
[171]	260	}
[92]	261	case "CAP":
[95]	262	var subCmd string
	263	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	264	return err
[92]	265	}
[95]	266	subCmd = strings.ToUpper(subCmd)
	267	subParams := msg.Params[2:]
	268	switch subCmd {
	269	case "LS":
	270	if len(subParams) < 1 {
	271	return newNeedMoreParamsError(msg.Command)
	272	}
	273	caps := strings.Fields(subParams[len(subParams)-1])
	274	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	275
[95]	276	for _, s := range caps {
	277	kv := strings.SplitN(s, "=", 2)
	278	k := strings.ToLower(kv[0])
	279	var v string
	280	if len(kv) == 2 {
	281	v = kv[1]
	282	}
	283	uc.caps[k] = v
[92]	284	}
	285
[95]	286	if more {
	287	break // wait to receive all capabilities
	288	}
	289
[152]	290	requestCaps := make([]string, 0, 16)
[193]	291	for _, c := range []string{"message-tags", "batch", "labeled-response", "server-time"} {
[152]	292	if _, ok := uc.caps[c]; ok {
	293	requestCaps = append(requestCaps, c)
	294	}
	295	}
	296
[95]	297	if uc.requestSASL() {
[152]	298	requestCaps = append(requestCaps, "sasl")
	299	}
	300
	301	if len(requestCaps) > 0 {
[95]	302	uc.SendMessage(&irc.Message{
	303	Command: "CAP",
[152]	304	Params: []string{"REQ", strings.Join(requestCaps, " ")},
[95]	305	})
[152]	306	}
	307
	308	if uc.requestSASL() {
[95]	309	break // we'll send CAP END after authentication is completed
	310	}
	311
[92]	312	uc.SendMessage(&irc.Message{
	313	Command: "CAP",
	314	Params: []string{"END"},
	315	})
[95]	316	case "ACK", "NAK":
	317	if len(subParams) < 1 {
	318	return newNeedMoreParamsError(msg.Command)
	319	}
	320	caps := strings.Fields(subParams[0])
	321
	322	for _, name := range caps {
	323	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	324	return err
	325	}
	326	}
	327
	328	if uc.saslClient == nil {
	329	uc.SendMessage(&irc.Message{
	330	Command: "CAP",
	331	Params: []string{"END"},
	332	})
	333	}
	334	default:
	335	uc.logger.Printf("unhandled message: %v", msg)
[92]	336	}
[95]	337	case "AUTHENTICATE":
	338	if uc.saslClient == nil {
	339	return fmt.Errorf("received unexpected AUTHENTICATE message")
	340	}
	341
	342	// TODO: if a challenge is 400 bytes long, buffer it
	343	var challengeStr string
	344	if err := parseMessageParams(msg, &challengeStr); err != nil {
	345	uc.SendMessage(&irc.Message{
	346	Command: "AUTHENTICATE",
	347	Params: []string{"*"},
	348	})
	349	return err
	350	}
	351
	352	var challenge []byte
	353	if challengeStr != "+" {
	354	var err error
	355	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	356	if err != nil {
	357	uc.SendMessage(&irc.Message{
	358	Command: "AUTHENTICATE",
	359	Params: []string{"*"},
	360	})
	361	return err
	362	}
	363	}
	364
	365	var resp []byte
	366	var err error
	367	if !uc.saslStarted {
	368	_, resp, err = uc.saslClient.Start()
	369	uc.saslStarted = true
	370	} else {
	371	resp, err = uc.saslClient.Next(challenge)
	372	}
	373	if err != nil {
	374	uc.SendMessage(&irc.Message{
	375	Command: "AUTHENTICATE",
	376	Params: []string{"*"},
	377	})
	378	return err
	379	}
	380
	381	// TODO: send response in multiple chunks if >= 400 bytes
	382	var respStr = "+"
	383	if resp != nil {
	384	respStr = base64.StdEncoding.EncodeToString(resp)
	385	}
	386
	387	uc.SendMessage(&irc.Message{
	388	Command: "AUTHENTICATE",
	389	Params: []string{respStr},
	390	})
[125]	391	case irc.RPL_LOGGEDIN:
[95]	392	var account string
	393	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	394	return err
	395	}
	396	uc.logger.Printf("logged in with account %q", account)
[125]	397	case irc.RPL_LOGGEDOUT:
[95]	398	uc.logger.Printf("logged out")
[125]	399	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	400	var info string
	401	if err := parseMessageParams(msg, nil, &info); err != nil {
	402	return err
	403	}
	404	switch msg.Command {
[125]	405	case irc.ERR_NICKLOCKED:
[95]	406	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	407	case irc.ERR_SASLFAIL:
[95]	408	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	409	case irc.ERR_SASLTOOLONG:
[95]	410	uc.logger.Printf("SASL message too long: %v", info)
	411	}
	412
	413	uc.saslClient = nil
	414	uc.saslStarted = false
	415
	416	uc.SendMessage(&irc.Message{
	417	Command: "CAP",
	418	Params: []string{"END"},
	419	})
[14]	420	case irc.RPL_WELCOME:
[55]	421	uc.registered = true
	422	uc.logger.Printf("connection registered")
[19]	423
[77]	424	channels, err := uc.srv.db.ListChannels(uc.network.ID)
	425	if err != nil {
	426	uc.logger.Printf("failed to list channels from database: %v", err)
	427	break
	428	}
	429
	430	for _, ch := range channels {
[146]	431	params := []string{ch.Name}
	432	if ch.Key != "" {
	433	params = append(params, ch.Key)
	434	}
[60]	435	uc.SendMessage(&irc.Message{
[19]	436	Command: "JOIN",
[146]	437	Params: params,
[60]	438	})
[19]	439	}
[16]	440	case irc.RPL_MYINFO:
[139]	441	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
[43]	442	return err
[16]	443	}
[139]	444	case irc.RPL_ISUPPORT:
	445	if err := parseMessageParams(msg, nil, nil); err != nil {
	446	return err
[16]	447	}
[139]	448	for _, token := range msg.Params[1 : len(msg.Params)-1] {
	449	negate := false
	450	parameter := token
	451	value := ""
	452	if strings.HasPrefix(token, "-") {
	453	negate = true
	454	token = token[1:]
	455	} else {
	456	if i := strings.IndexByte(token, '='); i >= 0 {
	457	parameter = token[:i]
	458	value = token[i+1:]
	459	}
	460	}
	461	if !negate {
	462	switch parameter {
	463	case "CHANMODES":
	464	parts := strings.SplitN(value, ",", 5)
	465	if len(parts) < 4 {
	466	return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
	467	}
	468	modes := make(map[byte]channelModeType)
	469	for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
	470	for j := 0; j < len(parts[i]); j++ {
	471	mode := parts[i][j]
	472	modes[mode] = mt
	473	}
	474	}
	475	uc.availableChannelModes = modes
	476	case "CHANTYPES":
	477	uc.availableChannelTypes = value
	478	case "PREFIX":
	479	if value == "" {
	480	uc.availableMemberships = nil
	481	} else {
	482	if value[0] != '(' {
	483	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	484	}
	485	sep := strings.IndexByte(value, ')')
	486	if sep < 0 \|\| len(value) != sep*2 {
	487	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	488	}
	489	memberships := make([]membership, len(value)/2-1)
	490	for i := range memberships {
	491	memberships[i] = membership{
	492	Mode: value[i+1],
	493	Prefix: value[sep+i+1],
	494	}
	495	}
	496	uc.availableMemberships = memberships
	497	}
	498	}
	499	} else {
	500	// TODO: handle ISUPPORT negations
	501	}
	502	}
[153]	503	case "BATCH":
	504	var tag string
	505	if err := parseMessageParams(msg, &tag); err != nil {
	506	return err
	507	}
	508
	509	if strings.HasPrefix(tag, "+") {
	510	tag = tag[1:]
	511	if _, ok := uc.batches[tag]; ok {
	512	return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
	513	}
	514	var batchType string
	515	if err := parseMessageParams(msg, nil, &batchType); err != nil {
	516	return err
	517	}
[155]	518	label := label
	519	if label == "" && msgBatch != nil {
	520	label = msgBatch.Label
	521	}
[153]	522	uc.batches[tag] = batch{
	523	Type: batchType,
	524	Params: msg.Params[2:],
	525	Outer: msgBatch,
[155]	526	Label: label,
[153]	527	}
	528	} else if strings.HasPrefix(tag, "-") {
	529	tag = tag[1:]
	530	if _, ok := uc.batches[tag]; !ok {
	531	return fmt.Errorf("unknown BATCH reference tag: %q", tag)
	532	}
	533	delete(uc.batches, tag)
	534	} else {
	535	return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
	536	}
[42]	537	case "NICK":
[83]	538	if msg.Prefix == nil {
	539	return fmt.Errorf("expected a prefix")
	540	}
	541
[43]	542	var newNick string
	543	if err := parseMessageParams(msg, &newNick); err != nil {
	544	return err
[42]	545	}
	546
[244]	547	me := false
[55]	548	if msg.Prefix.Name == uc.nick {
	549	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
[244]	550	me = true
[55]	551	uc.nick = newNick
[42]	552	}
	553
[55]	554	for _, ch := range uc.channels {
[42]	555	if membership, ok := ch.Members[msg.Prefix.Name]; ok {
	556	delete(ch.Members, msg.Prefix.Name)
	557	ch.Members[newNick] = membership
[215]	558	uc.appendLog(ch.Name, msg)
[42]	559	}
	560	}
[82]	561
[244]	562	if !me {
[245]	563	uc.network.ring.Produce(msg)
[82]	564	uc.forEachDownstream(func(dc *downstreamConn) {
[245]	565	dc.SendMessage(dc.marshalMessage(msg, uc))
[82]	566	})
	567	}
[69]	568	case "JOIN":
	569	if msg.Prefix == nil {
	570	return fmt.Errorf("expected a prefix")
	571	}
[42]	572
[43]	573	var channels string
	574	if err := parseMessageParams(msg, &channels); err != nil {
	575	return err
[19]	576	}
[34]	577
[43]	578	for _, ch := range strings.Split(channels, ",") {
[55]	579	if msg.Prefix.Name == uc.nick {
	580	uc.logger.Printf("joined channel %q", ch)
	581	uc.channels[ch] = &upstreamChannel{
[34]	582	Name: ch,
[55]	583	conn: uc,
[139]	584	Members: make(map[string]*membership),
[34]	585	}
[139]	586
	587	uc.SendMessage(&irc.Message{
	588	Command: "MODE",
	589	Params: []string{ch},
	590	})
[34]	591	} else {
[55]	592	ch, err := uc.getChannel(ch)
[34]	593	if err != nil {
	594	return err
	595	}
[139]	596	ch.Members[msg.Prefix.Name] = nil
[19]	597	}
[69]	598
[245]	599	chMsg := msg.Copy()
	600	chMsg.Params[0] = ch
	601	uc.produce(ch, chMsg, nil)
[19]	602	}
[69]	603	case "PART":
	604	if msg.Prefix == nil {
	605	return fmt.Errorf("expected a prefix")
	606	}
[34]	607
[43]	608	var channels string
	609	if err := parseMessageParams(msg, &channels); err != nil {
	610	return err
[34]	611	}
	612
[43]	613	for _, ch := range strings.Split(channels, ",") {
[55]	614	if msg.Prefix.Name == uc.nick {
	615	uc.logger.Printf("parted channel %q", ch)
	616	delete(uc.channels, ch)
[34]	617	} else {
[55]	618	ch, err := uc.getChannel(ch)
[34]	619	if err != nil {
	620	return err
	621	}
	622	delete(ch.Members, msg.Prefix.Name)
	623	}
[69]	624
[245]	625	chMsg := msg.Copy()
	626	chMsg.Params[0] = ch
	627	uc.produce(ch, chMsg, nil)
[34]	628	}
[159]	629	case "KICK":
	630	if msg.Prefix == nil {
	631	return fmt.Errorf("expected a prefix")
	632	}
	633
	634	var channel, user string
	635	if err := parseMessageParams(msg, &channel, &user); err != nil {
	636	return err
	637	}
	638
	639	if user == uc.nick {
	640	uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
	641	delete(uc.channels, channel)
	642	} else {
	643	ch, err := uc.getChannel(channel)
	644	if err != nil {
	645	return err
	646	}
	647	delete(ch.Members, user)
	648	}
	649
[245]	650	uc.produce(channel, msg, nil)
[83]	651	case "QUIT":
	652	if msg.Prefix == nil {
	653	return fmt.Errorf("expected a prefix")
	654	}
	655
	656	if msg.Prefix.Name == uc.nick {
	657	uc.logger.Printf("quit")
	658	}
	659
	660	for _, ch := range uc.channels {
[178]	661	if _, ok := ch.Members[msg.Prefix.Name]; ok {
	662	delete(ch.Members, msg.Prefix.Name)
	663
[215]	664	uc.appendLog(ch.Name, msg)
[178]	665	}
[83]	666	}
	667
	668	if msg.Prefix.Name != uc.nick {
[245]	669	uc.network.ring.Produce(msg)
[83]	670	uc.forEachDownstream(func(dc *downstreamConn) {
[245]	671	dc.SendMessage(dc.marshalMessage(msg, uc))
[83]	672	})
	673	}
[19]	674	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	675	var name, topic string
	676	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	677	return err
[19]	678	}
[55]	679	ch, err := uc.getChannel(name)
[19]	680	if err != nil {
	681	return err
	682	}
	683	if msg.Command == irc.RPL_TOPIC {
[43]	684	ch.Topic = topic
[19]	685	} else {
	686	ch.Topic = ""
	687	}
	688	case "TOPIC":
[43]	689	var name string
[74]	690	if err := parseMessageParams(msg, &name); err != nil {
[43]	691	return err
[19]	692	}
[55]	693	ch, err := uc.getChannel(name)
[19]	694	if err != nil {
	695	return err
	696	}
	697	if len(msg.Params) > 1 {
	698	ch.Topic = msg.Params[1]
	699	} else {
	700	ch.Topic = ""
	701	}
[245]	702	uc.produce(ch.Name, msg, nil)
[139]	703	case "MODE":
	704	var name, modeStr string
	705	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	706	return err
	707	}
	708
	709	if !uc.isChannel(name) { // user mode change
	710	if name != uc.nick {
	711	return fmt.Errorf("received MODE message for unknown nick %q", name)
	712	}
	713	return uc.modes.Apply(modeStr)
	714	// TODO: notify downstreams about user mode change?
	715	} else { // channel mode change
	716	ch, err := uc.getChannel(name)
	717	if err != nil {
	718	return err
	719	}
	720
	721	if ch.modes != nil {
	722	if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[2:]...); err != nil {
	723	return err
	724	}
	725	}
	726
[245]	727	uc.produce(ch.Name, msg, nil)
[139]	728	}
	729	case irc.RPL_UMODEIS:
	730	if err := parseMessageParams(msg, nil); err != nil {
	731	return err
	732	}
	733	modeStr := ""
	734	if len(msg.Params) > 1 {
	735	modeStr = msg.Params[1]
	736	}
	737
	738	uc.modes = ""
	739	if err := uc.modes.Apply(modeStr); err != nil {
	740	return err
	741	}
	742	// TODO: send RPL_UMODEIS to downstream connections when applicable
	743	case irc.RPL_CHANNELMODEIS:
	744	var channel string
	745	if err := parseMessageParams(msg, nil, &channel); err != nil {
	746	return err
	747	}
	748	modeStr := ""
	749	if len(msg.Params) > 2 {
	750	modeStr = msg.Params[2]
	751	}
	752
	753	ch, err := uc.getChannel(channel)
	754	if err != nil {
	755	return err
	756	}
	757
	758	firstMode := ch.modes == nil
	759	ch.modes = make(map[byte]string)
	760	if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[3:]...); err != nil {
	761	return err
	762	}
	763	if firstMode {
	764	modeStr, modeParams := ch.modes.Format()
	765
	766	uc.forEachDownstream(func(dc *downstreamConn) {
	767	params := []string{dc.nick, dc.marshalChannel(uc, channel), modeStr}
	768	params = append(params, modeParams...)
	769
	770	dc.SendMessage(&irc.Message{
	771	Prefix: dc.srv.prefix(),
	772	Command: irc.RPL_CHANNELMODEIS,
	773	Params: params,
	774	})
	775	})
	776	}
[162]	777	case rpl_creationtime:
	778	var channel, creationTime string
	779	if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
	780	return err
	781	}
	782
	783	ch, err := uc.getChannel(channel)
	784	if err != nil {
	785	return err
	786	}
	787
	788	firstCreationTime := ch.creationTime == ""
	789	ch.creationTime = creationTime
	790	if firstCreationTime {
	791	uc.forEachDownstream(func(dc *downstreamConn) {
	792	dc.SendMessage(&irc.Message{
	793	Prefix: dc.srv.prefix(),
	794	Command: rpl_creationtime,
	795	Params: []string{dc.nick, channel, creationTime},
	796	})
	797	})
	798	}
[19]	799	case rpl_topicwhotime:
[43]	800	var name, who, timeStr string
	801	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	802	return err
[19]	803	}
[55]	804	ch, err := uc.getChannel(name)
[19]	805	if err != nil {
	806	return err
	807	}
[43]	808	ch.TopicWho = who
	809	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	810	if err != nil {
	811	return fmt.Errorf("failed to parse topic time: %v", err)
	812	}
	813	ch.TopicTime = time.Unix(sec, 0)
[177]	814	case irc.RPL_LIST:
	815	var channel, clients, topic string
	816	if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
	817	return err
	818	}
	819
[181]	820	pl := uc.getPendingLIST()
[177]	821	if pl == nil {
	822	return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
	823	}
	824
	825	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	826	dc.SendMessage(&irc.Message{
	827	Prefix: dc.srv.prefix(),
	828	Command: irc.RPL_LIST,
	829	Params: []string{dc.nick, dc.marshalChannel(uc, channel), clients, topic},
	830	})
	831	})
	832	case irc.RPL_LISTEND:
[181]	833	ok := uc.endPendingLISTs(false)
[177]	834	if !ok {
	835	return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
	836	}
[19]	837	case irc.RPL_NAMREPLY:
[43]	838	var name, statusStr, members string
	839	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	840	return err
[19]	841	}
[140]	842
	843	ch, ok := uc.channels[name]
	844	if !ok {
	845	// NAMES on a channel we have not joined, forward to downstream
[161]	846	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[140]	847	channel := dc.marshalChannel(uc, name)
[174]	848	members := splitSpace(members)
[140]	849	for i, member := range members {
	850	membership, nick := uc.parseMembershipPrefix(member)
	851	members[i] = membership.String() + dc.marshalNick(uc, nick)
	852	}
	853	memberStr := strings.Join(members, " ")
	854
	855	dc.SendMessage(&irc.Message{
	856	Prefix: dc.srv.prefix(),
	857	Command: irc.RPL_NAMREPLY,
	858	Params: []string{dc.nick, statusStr, channel, memberStr},
	859	})
	860	})
	861	return nil
[19]	862	}
	863
[43]	864	status, err := parseChannelStatus(statusStr)
[19]	865	if err != nil {
	866	return err
	867	}
	868	ch.Status = status
	869
[174]	870	for _, s := range splitSpace(members) {
[139]	871	membership, nick := uc.parseMembershipPrefix(s)
[19]	872	ch.Members[nick] = membership
	873	}
	874	case irc.RPL_ENDOFNAMES:
[43]	875	var name string
	876	if err := parseMessageParams(msg, nil, &name); err != nil {
	877	return err
[25]	878	}
[140]	879
	880	ch, ok := uc.channels[name]
	881	if !ok {
	882	// NAMES on a channel we have not joined, forward to downstream
[161]	883	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[140]	884	channel := dc.marshalChannel(uc, name)
	885
	886	dc.SendMessage(&irc.Message{
	887	Prefix: dc.srv.prefix(),
	888	Command: irc.RPL_ENDOFNAMES,
	889	Params: []string{dc.nick, channel, "End of /NAMES list"},
	890	})
	891	})
	892	return nil
[25]	893	}
	894
[34]	895	if ch.complete {
	896	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	897	}
[25]	898	ch.complete = true
[27]	899
[73]	900	uc.forEachDownstream(func(dc *downstreamConn) {
[27]	901	forwardChannel(dc, ch)
[40]	902	})
[127]	903	case irc.RPL_WHOREPLY:
	904	var channel, username, host, server, nick, mode, trailing string
	905	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	906	return err
	907	}
	908
	909	parts := strings.SplitN(trailing, " ", 2)
	910	if len(parts) != 2 {
	911	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	912	}
	913	realname := parts[1]
	914	hops, err := strconv.Atoi(parts[0])
	915	if err != nil {
	916	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	917	}
	918	hops++
	919
	920	trailing = strconv.Itoa(hops) + " " + realname
	921
[161]	922	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	923	channel := channel
	924	if channel != "*" {
	925	channel = dc.marshalChannel(uc, channel)
	926	}
	927	nick := dc.marshalNick(uc, nick)
	928	dc.SendMessage(&irc.Message{
	929	Prefix: dc.srv.prefix(),
	930	Command: irc.RPL_WHOREPLY,
	931	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	932	})
	933	})
	934	case irc.RPL_ENDOFWHO:
	935	var name string
	936	if err := parseMessageParams(msg, nil, &name); err != nil {
	937	return err
	938	}
	939
[161]	940	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	941	name := name
	942	if name != "*" {
	943	// TODO: support WHO masks
	944	name = dc.marshalEntity(uc, name)
	945	}
	946	dc.SendMessage(&irc.Message{
	947	Prefix: dc.srv.prefix(),
	948	Command: irc.RPL_ENDOFWHO,
[142]	949	Params: []string{dc.nick, name, "End of /WHO list"},
[127]	950	})
	951	})
[128]	952	case irc.RPL_WHOISUSER:
	953	var nick, username, host, realname string
	954	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	955	return err
	956	}
	957
[161]	958	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	959	nick := dc.marshalNick(uc, nick)
	960	dc.SendMessage(&irc.Message{
	961	Prefix: dc.srv.prefix(),
	962	Command: irc.RPL_WHOISUSER,
	963	Params: []string{dc.nick, nick, username, host, "*", realname},
	964	})
	965	})
	966	case irc.RPL_WHOISSERVER:
	967	var nick, server, serverInfo string
	968	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	969	return err
	970	}
	971
[161]	972	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	973	nick := dc.marshalNick(uc, nick)
	974	dc.SendMessage(&irc.Message{
	975	Prefix: dc.srv.prefix(),
	976	Command: irc.RPL_WHOISSERVER,
	977	Params: []string{dc.nick, nick, server, serverInfo},
	978	})
	979	})
	980	case irc.RPL_WHOISOPERATOR:
	981	var nick string
	982	if err := parseMessageParams(msg, nil, &nick); err != nil {
	983	return err
	984	}
	985
[161]	986	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	987	nick := dc.marshalNick(uc, nick)
	988	dc.SendMessage(&irc.Message{
	989	Prefix: dc.srv.prefix(),
	990	Command: irc.RPL_WHOISOPERATOR,
	991	Params: []string{dc.nick, nick, "is an IRC operator"},
	992	})
	993	})
	994	case irc.RPL_WHOISIDLE:
	995	var nick string
	996	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	997	return err
	998	}
	999
[161]	1000	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1001	nick := dc.marshalNick(uc, nick)
	1002	params := []string{dc.nick, nick}
	1003	params = append(params, msg.Params[2:]...)
	1004	dc.SendMessage(&irc.Message{
	1005	Prefix: dc.srv.prefix(),
	1006	Command: irc.RPL_WHOISIDLE,
	1007	Params: params,
	1008	})
	1009	})
	1010	case irc.RPL_WHOISCHANNELS:
	1011	var nick, channelList string
	1012	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	1013	return err
	1014	}
[174]	1015	channels := splitSpace(channelList)
[128]	1016
[161]	1017	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1018	nick := dc.marshalNick(uc, nick)
	1019	channelList := make([]string, len(channels))
	1020	for i, channel := range channels {
[139]	1021	prefix, channel := uc.parseMembershipPrefix(channel)
[128]	1022	channel = dc.marshalChannel(uc, channel)
	1023	channelList[i] = prefix.String() + channel
	1024	}
	1025	channels := strings.Join(channelList, " ")
	1026	dc.SendMessage(&irc.Message{
	1027	Prefix: dc.srv.prefix(),
	1028	Command: irc.RPL_WHOISCHANNELS,
	1029	Params: []string{dc.nick, nick, channels},
	1030	})
	1031	})
	1032	case irc.RPL_ENDOFWHOIS:
	1033	var nick string
	1034	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1035	return err
	1036	}
	1037
[161]	1038	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1039	nick := dc.marshalNick(uc, nick)
	1040	dc.SendMessage(&irc.Message{
	1041	Prefix: dc.srv.prefix(),
	1042	Command: irc.RPL_ENDOFWHOIS,
[142]	1043	Params: []string{dc.nick, nick, "End of /WHOIS list"},
[128]	1044	})
	1045	})
[36]	1046	case "PRIVMSG":
[117]	1047	if msg.Prefix == nil {
	1048	return fmt.Errorf("expected a prefix")
	1049	}
	1050
[217]	1051	var entity, text string
	1052	if err := parseMessageParams(msg, &entity, &text); err != nil {
[69]	1053	return err
	1054	}
[117]	1055
	1056	if msg.Prefix.Name == serviceNick {
	1057	uc.logger.Printf("skipping PRIVMSG from soju's service: %v", msg)
	1058	break
	1059	}
[217]	1060	if entity == serviceNick {
[117]	1061	uc.logger.Printf("skipping PRIVMSG to soju's service: %v", msg)
	1062	break
	1063	}
	1064
[217]	1065	target := entity
	1066	if target == uc.nick {
[178]	1067	target = msg.Prefix.Name
	1068	}
[239]	1069	uc.produce(target, msg, nil)
[115]	1070	case "INVITE":
	1071	var nick string
	1072	var channel string
	1073	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1074	return err
	1075	}
	1076
	1077	uc.forEachDownstream(func(dc *downstreamConn) {
	1078	dc.SendMessage(&irc.Message{
	1079	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	1080	Command: "INVITE",
	1081	Params: []string{dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
	1082	})
	1083	})
[163]	1084	case irc.RPL_INVITING:
	1085	var nick string
	1086	var channel string
	1087	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1088	return err
	1089	}
	1090
	1091	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1092	dc.SendMessage(&irc.Message{
	1093	Prefix: dc.srv.prefix(),
	1094	Command: irc.RPL_INVITING,
	1095	Params: []string{dc.nick, dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
	1096	})
	1097	})
[177]	1098	case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
	1099	var command, reason string
	1100	if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
	1101	return err
	1102	}
	1103
	1104	if command == "LIST" {
[181]	1105	ok := uc.endPendingLISTs(false)
[177]	1106	if !ok {
	1107	return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
	1108	}
	1109	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1110	dc.SendMessage(&irc.Message{
	1111	Prefix: uc.srv.prefix(),
	1112	Command: msg.Command,
	1113	Params: []string{dc.nick, "LIST", reason},
	1114	})
	1115	})
	1116	}
[152]	1117	case "TAGMSG":
	1118	// TODO: relay to downstream connections that accept message-tags
[155]	1119	case "ACK":
	1120	// Ignore
[198]	1121	case irc.RPL_NOWAWAY, irc.RPL_UNAWAY:
	1122	// Ignore
[16]	1123	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	1124	// Ignore
	1125	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	1126	// Ignore
	1127	case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
	1128	// Ignore
[177]	1129	case irc.RPL_LISTSTART:
	1130	// Ignore
[14]	1131	case rpl_localusers, rpl_globalusers:
	1132	// Ignore
[96]	1133	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	1134	// Ignore
[13]	1135	default:
[95]	1136	uc.logger.Printf("unhandled message: %v", msg)
[13]	1137	}
[14]	1138	return nil
[13]	1139	}
	1140
[174]	1141	func splitSpace(s string) []string {
	1142	return strings.FieldsFunc(s, func(r rune) bool {
	1143	return r == ' '
	1144	})
	1145	}
	1146
[55]	1147	func (uc *upstreamConn) register() {
[77]	1148	uc.nick = uc.network.Nick
	1149	uc.username = uc.network.Username
	1150	if uc.username == "" {
	1151	uc.username = uc.nick
	1152	}
	1153	uc.realname = uc.network.Realname
	1154	if uc.realname == "" {
	1155	uc.realname = uc.nick
	1156	}
	1157
[60]	1158	uc.SendMessage(&irc.Message{
[92]	1159	Command: "CAP",
	1160	Params: []string{"LS", "302"},
	1161	})
	1162
[93]	1163	if uc.network.Pass != "" {
	1164	uc.SendMessage(&irc.Message{
	1165	Command: "PASS",
	1166	Params: []string{uc.network.Pass},
	1167	})
	1168	}
	1169
[92]	1170	uc.SendMessage(&irc.Message{
[13]	1171	Command: "NICK",
[69]	1172	Params: []string{uc.nick},
[60]	1173	})
	1174	uc.SendMessage(&irc.Message{
[13]	1175	Command: "USER",
[77]	1176	Params: []string{uc.username, "0", "*", uc.realname},
[60]	1177	})
[44]	1178	}
[13]	1179
[197]	1180	func (uc *upstreamConn) runUntilRegistered() error {
	1181	for !uc.registered {
[212]	1182	msg, err := uc.ReadMessage()
[197]	1183	if err != nil {
	1184	return fmt.Errorf("failed to read message: %v", err)
	1185	}
	1186
	1187	if err := uc.handleMessage(msg); err != nil {
	1188	return fmt.Errorf("failed to handle message %q: %v", msg, err)
	1189	}
	1190	}
	1191
	1192	return nil
	1193	}
	1194
[95]	1195	func (uc *upstreamConn) requestSASL() bool {
	1196	if uc.network.SASL.Mechanism == "" {
	1197	return false
	1198	}
	1199
	1200	v, ok := uc.caps["sasl"]
	1201	if !ok {
	1202	return false
	1203	}
	1204	if v != "" {
	1205	mechanisms := strings.Split(v, ",")
	1206	found := false
	1207	for _, mech := range mechanisms {
	1208	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	1209	found = true
	1210	break
	1211	}
	1212	}
	1213	if !found {
	1214	return false
	1215	}
	1216	}
	1217
	1218	return true
	1219	}
	1220
	1221	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	1222	auth := &uc.network.SASL
	1223	switch name {
	1224	case "sasl":
	1225	if !ok {
	1226	uc.logger.Printf("server refused to acknowledge the SASL capability")
	1227	return nil
	1228	}
	1229
	1230	switch auth.Mechanism {
	1231	case "PLAIN":
	1232	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	1233	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
	1234	default:
	1235	return fmt.Errorf("unsupported SASL mechanism %q", name)
	1236	}
	1237
	1238	uc.SendMessage(&irc.Message{
	1239	Command: "AUTHENTICATE",
	1240	Params: []string{auth.Mechanism},
	1241	})
[152]	1242	case "message-tags":
	1243	uc.tagsSupported = ok
[155]	1244	case "labeled-response":
	1245	uc.labelsSupported = ok
[193]	1246	case "batch", "server-time":
	1247	// Nothing to do
	1248	default:
	1249	uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
[95]	1250	}
	1251	return nil
	1252	}
	1253
[165]	1254	func (uc *upstreamConn) readMessages(ch chan<- event) error {
[13]	1255	for {
[210]	1256	msg, err := uc.ReadMessage()
[13]	1257	if err == io.EOF {
	1258	break
	1259	} else if err != nil {
	1260	return fmt.Errorf("failed to read IRC command: %v", err)
	1261	}
	1262
[165]	1263	ch <- eventUpstreamMessage{msg, uc}
[13]	1264	}
	1265
[45]	1266	return nil
[13]	1267	}
[60]	1268
[176]	1269	func (uc upstreamConn) SendMessageLabeled(downstreamID uint64, msg irc.Message) {
[155]	1270	if uc.labelsSupported {
	1271	if msg.Tags == nil {
	1272	msg.Tags = make(map[string]irc.TagValue)
	1273	}
[176]	1274	msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
[161]	1275	uc.nextLabelID++
[155]	1276	}
	1277	uc.SendMessage(msg)
	1278	}
[178]	1279
	1280	// TODO: handle moving logs when a network name changes, when support for this is added
[215]	1281	func (uc upstreamConn) appendLog(entity string, msg irc.Message) {
[178]	1282	if uc.srv.LogPath == "" {
	1283	return
	1284	}
[215]	1285
	1286	ml, ok := uc.messageLoggers[entity]
	1287	if !ok {
[248]	1288	ml = newMessageLogger(uc.network, entity)
[215]	1289	uc.messageLoggers[entity] = ml
[178]	1290	}
	1291
[215]	1292	if err := ml.Append(msg); err != nil {
	1293	uc.logger.Printf("failed to log message: %v", err)
[178]	1294	}
	1295	}
[198]	1296
[245]	1297	// produce appends a message to the logs, adds it to the history and forwards
	1298	// it to connected downstream connections.
	1299	//
	1300	// If origin is not nil and origin doesn't support echo-message, the message is
	1301	// forwarded to all connections except origin.
[239]	1302	func (uc upstreamConn) produce(target string, msg irc.Message, origin *downstreamConn) {
	1303	if target != "" {
	1304	uc.appendLog(target, msg)
	1305	}
	1306
[226]	1307	uc.network.ring.Produce(msg)
[227]	1308
	1309	uc.forEachDownstream(func(dc *downstreamConn) {
[238]	1310	if dc != origin \|\| dc.caps["echo-message"] {
[245]	1311	dc.SendMessage(dc.marshalMessage(msg, uc))
[238]	1312	}
[227]	1313	})
[226]	1314	}
	1315
[198]	1316	func (uc *upstreamConn) updateAway() {
	1317	away := true
	1318	uc.forEachDownstream(func(*downstreamConn) {
	1319	away = false
	1320	})
	1321	if away == uc.away {
	1322	return
	1323	}
	1324	if away {
	1325	uc.SendMessage(&irc.Message{
	1326	Command: "AWAY",
	1327	Params: []string{"Auto away"},
	1328	})
	1329	} else {
	1330	uc.SendMessage(&irc.Message{
	1331	Command: "AWAY",
	1332	})
	1333	}
	1334	uc.away = away
	1335	}

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