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source: code/trunk/upstream.go@ 181

Last change on this file since 181 was 181, checked in by contact, 5 years ago
s/List/LIST/ when referring to the command
File size: 36.1 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"
[178]	10	"os"
	11	"path/filepath"
[19]	12	"strconv"
[17]	13	"strings"
[19]	14	"time"
[13]	15
[95]	16	"github.com/emersion/go-sasl"
[13]	17	"gopkg.in/irc.v3"
	18	)
	19
[19]	20	type upstreamChannel struct {
[162]	21	Name string
	22	conn *upstreamConn
	23	Topic string
	24	TopicWho string
	25	TopicTime time.Time
	26	Status channelStatus
	27	modes channelModes
	28	creationTime string
	29	Members map[string]*membership
	30	complete bool
[19]	31	}
	32
[13]	33	type upstreamConn struct {
[77]	34	network *network
[21]	35	logger Logger
[19]	36	net net.Conn
	37	irc *irc.Conn
	38	srv *Server
[37]	39	user *user
[102]	40	outgoing chan<- *irc.Message
[175]	41	closed chan struct{}
[16]	42
	43	serverName string
	44	availableUserModes string
[139]	45	availableChannelModes map[byte]channelModeType
	46	availableChannelTypes string
	47	availableMemberships []membership
[19]	48
	49	registered bool
[42]	50	nick string
[77]	51	username string
	52	realname string
[139]	53	modes userModes
[19]	54	channels map[string]*upstreamChannel
[92]	55	caps map[string]string
[153]	56	batches map[string]batch
[95]	57
[155]	58	tagsSupported bool
	59	labelsSupported bool
[161]	60	nextLabelID uint64
[152]	61
[95]	62	saslClient sasl.Client
	63	saslStarted bool
[177]	64
	65	// set of LIST commands in progress, per downstream
	66	pendingLISTDownstreamSet map[uint64]struct{}
[178]	67
	68	logs map[string]entityLog
[13]	69	}
	70
[178]	71	type entityLog struct {
	72	name string
	73	file *os.File
	74	}
	75
[77]	76	func connectToUpstream(network network) (upstreamConn, error) {
	77	logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
[33]	78
[77]	79	addr := network.Addr
	80	if !strings.ContainsRune(addr, ':') {
	81	addr = addr + ":6697"
	82	}
	83
	84	logger.Printf("connecting to TLS server at address %q", addr)
	85	netConn, err := tls.Dial("tcp", addr, nil)
[33]	86	if err != nil {
[77]	87	return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
[33]	88	}
	89
[67]	90	setKeepAlive(netConn)
	91
[102]	92	outgoing := make(chan *irc.Message, 64)
[55]	93	uc := &upstreamConn{
[177]	94	network: network,
	95	logger: logger,
	96	net: netConn,
	97	irc: irc.NewConn(netConn),
	98	srv: network.user.srv,
	99	user: network.user,
	100	outgoing: outgoing,
	101	channels: make(map[string]*upstreamChannel),
	102	caps: make(map[string]string),
	103	batches: make(map[string]batch),
	104	availableChannelTypes: stdChannelTypes,
	105	availableChannelModes: stdChannelModes,
	106	availableMemberships: stdMemberships,
	107	pendingLISTDownstreamSet: make(map[uint64]struct{}),
[178]	108	logs: make(map[string]entityLog),
[33]	109	}
	110
	111	go func() {
[175]	112	for {
	113	var closed bool
	114	select {
	115	case msg := <-outgoing:
	116	if uc.srv.Debug {
	117	uc.logger.Printf("sent: %v", msg)
	118	}
	119	if err := uc.irc.WriteMessage(msg); err != nil {
	120	uc.logger.Printf("failed to write message: %v", err)
	121	}
	122	case <-uc.closed:
	123	closed = true
[64]	124	}
[175]	125	if closed {
	126	break
[33]	127	}
	128	}
[55]	129	if err := uc.net.Close(); err != nil {
	130	uc.logger.Printf("failed to close connection: %v", err)
[45]	131	} else {
[55]	132	uc.logger.Printf("connection closed")
[45]	133	}
[33]	134	}()
	135
[55]	136	return uc, nil
[33]	137	}
	138
[175]	139	func (uc *upstreamConn) isClosed() bool {
	140	select {
	141	case <-uc.closed:
	142	return true
	143	default:
	144	return false
	145	}
	146	}
	147
[180]	148	// Close closes the connection. It is safe to call from any goroutine.
[55]	149	func (uc *upstreamConn) Close() error {
[175]	150	if uc.isClosed() {
[33]	151	return fmt.Errorf("upstream connection already closed")
	152	}
[175]	153	close(uc.closed)
[33]	154	return nil
	155	}
	156
[73]	157	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
	158	uc.user.forEachDownstream(func(dc *downstreamConn) {
[77]	159	if dc.network != nil && dc.network != uc.network {
[73]	160	return
	161	}
	162	f(dc)
	163	})
	164	}
	165
[161]	166	func (uc upstreamConn) forEachDownstreamByID(id uint64, f func(downstreamConn)) {
[155]	167	uc.forEachDownstream(func(dc *downstreamConn) {
	168	if id != 0 && id != dc.id {
	169	return
	170	}
	171	f(dc)
	172	})
	173	}
	174
[55]	175	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
	176	ch, ok := uc.channels[name]
[19]	177	if !ok {
	178	return nil, fmt.Errorf("unknown channel %q", name)
	179	}
	180	return ch, nil
	181	}
	182
[129]	183	func (uc *upstreamConn) isChannel(entity string) bool {
[139]	184	if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
	185	return true
[129]	186	}
	187	return false
	188	}
	189
[181]	190	func (uc upstreamConn) getPendingLIST() pendingLIST {
[177]	191	for _, pl := range uc.user.pendingLISTs {
	192	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	193	continue
	194	}
	195	return &pl
	196	}
	197	return nil
	198	}
	199
[181]	200	func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
[177]	201	found = false
	202	for i := 0; i < len(uc.user.pendingLISTs); i++ {
	203	pl := uc.user.pendingLISTs[i]
	204	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	205	continue
	206	}
	207	delete(pl.pendingCommands, uc.network.ID)
	208	if len(pl.pendingCommands) == 0 {
	209	uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
	210	i--
	211	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	212	dc.SendMessage(&irc.Message{
	213	Prefix: dc.srv.prefix(),
	214	Command: irc.RPL_LISTEND,
	215	Params: []string{dc.nick, "End of /LIST"},
	216	})
	217	})
	218	}
	219	found = true
	220	if !all {
	221	delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
	222	uc.user.forEachUpstream(func(uc *upstreamConn) {
[181]	223	uc.trySendLIST(pl.downstreamID)
[177]	224	})
	225	return
	226	}
	227	}
	228	return
	229	}
	230
[181]	231	func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
[177]	232	// must be called with a lock in uc.user.pendingLISTsLock
	233
	234	if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
	235	// a LIST command is already pending
	236	// we will try again when that command is completed
	237	return
	238	}
	239
	240	for _, pl := range uc.user.pendingLISTs {
	241	if pl.downstreamID != downstreamID {
	242	continue
	243	}
	244	// this is the first pending LIST command list of the downstream
	245	listCommand, ok := pl.pendingCommands[uc.network.ID]
	246	if !ok {
	247	// there is no command for this upstream in these LIST commands
	248	// do not send anything
	249	continue
	250	}
	251	// there is a command for this upstream in these LIST commands
	252	// send it now
	253
	254	uc.SendMessageLabeled(downstreamID, listCommand)
	255
	256	uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
	257	return
	258	}
	259	}
	260
[139]	261	func (uc upstreamConn) parseMembershipPrefix(s string) (membership membership, nick string) {
	262	for _, m := range uc.availableMemberships {
	263	if m.Prefix == s[0] {
	264	return &m, s[1:]
	265	}
	266	}
	267	return nil, s
	268	}
	269
[55]	270	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[155]	271	var label string
	272	if l, ok := msg.GetTag("label"); ok {
	273	label = l
	274	}
	275
[153]	276	var msgBatch *batch
	277	if batchName, ok := msg.GetTag("batch"); ok {
	278	b, ok := uc.batches[batchName]
	279	if !ok {
	280	return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
	281	}
	282	msgBatch = &b
[155]	283	if label == "" {
	284	label = msgBatch.Label
	285	}
[153]	286	}
	287
[161]	288	var downstreamID uint64 = 0
[155]	289	if label != "" {
	290	var labelOffset uint64
[161]	291	n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
[155]	292	if err == nil && n < 2 {
	293	err = errors.New("not enough arguments")
	294	}
	295	if err != nil {
	296	return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
	297	}
	298	}
	299
[13]	300	switch msg.Command {
	301	case "PING":
[60]	302	uc.SendMessage(&irc.Message{
[13]	303	Command: "PONG",
[68]	304	Params: msg.Params,
[60]	305	})
[33]	306	return nil
[18]	307	case "NOTICE":
[55]	308	uc.logger.Print(msg)
[97]	309
[171]	310	if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
	311	uc.forEachDownstream(func(dc *downstreamConn) {
	312	dc.SendMessage(msg)
	313	})
	314	} else { // regular user NOTICE
	315	var nick, text string
	316	if err := parseMessageParams(msg, &nick, &text); err != nil {
	317	return err
	318	}
	319
[178]	320	target := nick
	321	if nick == uc.nick {
	322	target = msg.Prefix.Name
	323	}
	324	uc.AppendLog(target, "<%s> %s", msg.Prefix.Name, text)
	325
[171]	326	uc.forEachDownstream(func(dc *downstreamConn) {
	327	dc.SendMessage(&irc.Message{
	328	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	329	Command: "NOTICE",
	330	Params: []string{dc.marshalEntity(uc, nick), text},
	331	})
	332	})
	333	}
[92]	334	case "CAP":
[95]	335	var subCmd string
	336	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	337	return err
[92]	338	}
[95]	339	subCmd = strings.ToUpper(subCmd)
	340	subParams := msg.Params[2:]
	341	switch subCmd {
	342	case "LS":
	343	if len(subParams) < 1 {
	344	return newNeedMoreParamsError(msg.Command)
	345	}
	346	caps := strings.Fields(subParams[len(subParams)-1])
	347	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	348
[95]	349	for _, s := range caps {
	350	kv := strings.SplitN(s, "=", 2)
	351	k := strings.ToLower(kv[0])
	352	var v string
	353	if len(kv) == 2 {
	354	v = kv[1]
	355	}
	356	uc.caps[k] = v
[92]	357	}
	358
[95]	359	if more {
	360	break // wait to receive all capabilities
	361	}
	362
[152]	363	requestCaps := make([]string, 0, 16)
[155]	364	for _, c := range []string{"message-tags", "batch", "labeled-response"} {
[152]	365	if _, ok := uc.caps[c]; ok {
	366	requestCaps = append(requestCaps, c)
	367	}
	368	}
	369
[95]	370	if uc.requestSASL() {
[152]	371	requestCaps = append(requestCaps, "sasl")
	372	}
	373
	374	if len(requestCaps) > 0 {
[95]	375	uc.SendMessage(&irc.Message{
	376	Command: "CAP",
[152]	377	Params: []string{"REQ", strings.Join(requestCaps, " ")},
[95]	378	})
[152]	379	}
	380
	381	if uc.requestSASL() {
[95]	382	break // we'll send CAP END after authentication is completed
	383	}
	384
[92]	385	uc.SendMessage(&irc.Message{
	386	Command: "CAP",
	387	Params: []string{"END"},
	388	})
[95]	389	case "ACK", "NAK":
	390	if len(subParams) < 1 {
	391	return newNeedMoreParamsError(msg.Command)
	392	}
	393	caps := strings.Fields(subParams[0])
	394
	395	for _, name := range caps {
	396	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	397	return err
	398	}
	399	}
	400
	401	if uc.saslClient == nil {
	402	uc.SendMessage(&irc.Message{
	403	Command: "CAP",
	404	Params: []string{"END"},
	405	})
	406	}
	407	default:
	408	uc.logger.Printf("unhandled message: %v", msg)
[92]	409	}
[95]	410	case "AUTHENTICATE":
	411	if uc.saslClient == nil {
	412	return fmt.Errorf("received unexpected AUTHENTICATE message")
	413	}
	414
	415	// TODO: if a challenge is 400 bytes long, buffer it
	416	var challengeStr string
	417	if err := parseMessageParams(msg, &challengeStr); err != nil {
	418	uc.SendMessage(&irc.Message{
	419	Command: "AUTHENTICATE",
	420	Params: []string{"*"},
	421	})
	422	return err
	423	}
	424
	425	var challenge []byte
	426	if challengeStr != "+" {
	427	var err error
	428	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	429	if err != nil {
	430	uc.SendMessage(&irc.Message{
	431	Command: "AUTHENTICATE",
	432	Params: []string{"*"},
	433	})
	434	return err
	435	}
	436	}
	437
	438	var resp []byte
	439	var err error
	440	if !uc.saslStarted {
	441	_, resp, err = uc.saslClient.Start()
	442	uc.saslStarted = true
	443	} else {
	444	resp, err = uc.saslClient.Next(challenge)
	445	}
	446	if err != nil {
	447	uc.SendMessage(&irc.Message{
	448	Command: "AUTHENTICATE",
	449	Params: []string{"*"},
	450	})
	451	return err
	452	}
	453
	454	// TODO: send response in multiple chunks if >= 400 bytes
	455	var respStr = "+"
	456	if resp != nil {
	457	respStr = base64.StdEncoding.EncodeToString(resp)
	458	}
	459
	460	uc.SendMessage(&irc.Message{
	461	Command: "AUTHENTICATE",
	462	Params: []string{respStr},
	463	})
[125]	464	case irc.RPL_LOGGEDIN:
[95]	465	var account string
	466	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	467	return err
	468	}
	469	uc.logger.Printf("logged in with account %q", account)
[125]	470	case irc.RPL_LOGGEDOUT:
[95]	471	uc.logger.Printf("logged out")
[125]	472	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	473	var info string
	474	if err := parseMessageParams(msg, nil, &info); err != nil {
	475	return err
	476	}
	477	switch msg.Command {
[125]	478	case irc.ERR_NICKLOCKED:
[95]	479	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	480	case irc.ERR_SASLFAIL:
[95]	481	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	482	case irc.ERR_SASLTOOLONG:
[95]	483	uc.logger.Printf("SASL message too long: %v", info)
	484	}
	485
	486	uc.saslClient = nil
	487	uc.saslStarted = false
	488
	489	uc.SendMessage(&irc.Message{
	490	Command: "CAP",
	491	Params: []string{"END"},
	492	})
[14]	493	case irc.RPL_WELCOME:
[55]	494	uc.registered = true
	495	uc.logger.Printf("connection registered")
[19]	496
[77]	497	channels, err := uc.srv.db.ListChannels(uc.network.ID)
	498	if err != nil {
	499	uc.logger.Printf("failed to list channels from database: %v", err)
	500	break
	501	}
	502
	503	for _, ch := range channels {
[146]	504	params := []string{ch.Name}
	505	if ch.Key != "" {
	506	params = append(params, ch.Key)
	507	}
[60]	508	uc.SendMessage(&irc.Message{
[19]	509	Command: "JOIN",
[146]	510	Params: params,
[60]	511	})
[19]	512	}
[16]	513	case irc.RPL_MYINFO:
[139]	514	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
[43]	515	return err
[16]	516	}
[139]	517	case irc.RPL_ISUPPORT:
	518	if err := parseMessageParams(msg, nil, nil); err != nil {
	519	return err
[16]	520	}
[139]	521	for _, token := range msg.Params[1 : len(msg.Params)-1] {
	522	negate := false
	523	parameter := token
	524	value := ""
	525	if strings.HasPrefix(token, "-") {
	526	negate = true
	527	token = token[1:]
	528	} else {
	529	if i := strings.IndexByte(token, '='); i >= 0 {
	530	parameter = token[:i]
	531	value = token[i+1:]
	532	}
	533	}
	534	if !negate {
	535	switch parameter {
	536	case "CHANMODES":
	537	parts := strings.SplitN(value, ",", 5)
	538	if len(parts) < 4 {
	539	return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
	540	}
	541	modes := make(map[byte]channelModeType)
	542	for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
	543	for j := 0; j < len(parts[i]); j++ {
	544	mode := parts[i][j]
	545	modes[mode] = mt
	546	}
	547	}
	548	uc.availableChannelModes = modes
	549	case "CHANTYPES":
	550	uc.availableChannelTypes = value
	551	case "PREFIX":
	552	if value == "" {
	553	uc.availableMemberships = nil
	554	} else {
	555	if value[0] != '(' {
	556	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	557	}
	558	sep := strings.IndexByte(value, ')')
	559	if sep < 0 \|\| len(value) != sep*2 {
	560	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	561	}
	562	memberships := make([]membership, len(value)/2-1)
	563	for i := range memberships {
	564	memberships[i] = membership{
	565	Mode: value[i+1],
	566	Prefix: value[sep+i+1],
	567	}
	568	}
	569	uc.availableMemberships = memberships
	570	}
	571	}
	572	} else {
	573	// TODO: handle ISUPPORT negations
	574	}
	575	}
[153]	576	case "BATCH":
	577	var tag string
	578	if err := parseMessageParams(msg, &tag); err != nil {
	579	return err
	580	}
	581
	582	if strings.HasPrefix(tag, "+") {
	583	tag = tag[1:]
	584	if _, ok := uc.batches[tag]; ok {
	585	return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
	586	}
	587	var batchType string
	588	if err := parseMessageParams(msg, nil, &batchType); err != nil {
	589	return err
	590	}
[155]	591	label := label
	592	if label == "" && msgBatch != nil {
	593	label = msgBatch.Label
	594	}
[153]	595	uc.batches[tag] = batch{
	596	Type: batchType,
	597	Params: msg.Params[2:],
	598	Outer: msgBatch,
[155]	599	Label: label,
[153]	600	}
	601	} else if strings.HasPrefix(tag, "-") {
	602	tag = tag[1:]
	603	if _, ok := uc.batches[tag]; !ok {
	604	return fmt.Errorf("unknown BATCH reference tag: %q", tag)
	605	}
	606	delete(uc.batches, tag)
	607	} else {
	608	return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
	609	}
[42]	610	case "NICK":
[83]	611	if msg.Prefix == nil {
	612	return fmt.Errorf("expected a prefix")
	613	}
	614
[43]	615	var newNick string
	616	if err := parseMessageParams(msg, &newNick); err != nil {
	617	return err
[42]	618	}
	619
[55]	620	if msg.Prefix.Name == uc.nick {
	621	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
	622	uc.nick = newNick
[42]	623	}
	624
[55]	625	for _, ch := range uc.channels {
[42]	626	if membership, ok := ch.Members[msg.Prefix.Name]; ok {
	627	delete(ch.Members, msg.Prefix.Name)
	628	ch.Members[newNick] = membership
[178]	629	uc.AppendLog(ch.Name, "*** %s is now known as %s", msg.Prefix.Name, newNick)
[42]	630	}
	631	}
[82]	632
	633	if msg.Prefix.Name != uc.nick {
	634	uc.forEachDownstream(func(dc *downstreamConn) {
	635	dc.SendMessage(&irc.Message{
	636	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	637	Command: "NICK",
	638	Params: []string{newNick},
	639	})
	640	})
	641	}
[69]	642	case "JOIN":
	643	if msg.Prefix == nil {
	644	return fmt.Errorf("expected a prefix")
	645	}
[42]	646
[43]	647	var channels string
	648	if err := parseMessageParams(msg, &channels); err != nil {
	649	return err
[19]	650	}
[34]	651
[43]	652	for _, ch := range strings.Split(channels, ",") {
[55]	653	if msg.Prefix.Name == uc.nick {
	654	uc.logger.Printf("joined channel %q", ch)
	655	uc.channels[ch] = &upstreamChannel{
[34]	656	Name: ch,
[55]	657	conn: uc,
[139]	658	Members: make(map[string]*membership),
[34]	659	}
[139]	660
	661	uc.SendMessage(&irc.Message{
	662	Command: "MODE",
	663	Params: []string{ch},
	664	})
[34]	665	} else {
[55]	666	ch, err := uc.getChannel(ch)
[34]	667	if err != nil {
	668	return err
	669	}
[139]	670	ch.Members[msg.Prefix.Name] = nil
[19]	671	}
[69]	672
[178]	673	uc.AppendLog(ch, "*** Joins: %s (%s@%s)", msg.Prefix.Name, msg.Prefix.User, msg.Prefix.Host)
	674
[73]	675	uc.forEachDownstream(func(dc *downstreamConn) {
[69]	676	dc.SendMessage(&irc.Message{
	677	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	678	Command: "JOIN",
	679	Params: []string{dc.marshalChannel(uc, ch)},
	680	})
	681	})
[19]	682	}
[69]	683	case "PART":
	684	if msg.Prefix == nil {
	685	return fmt.Errorf("expected a prefix")
	686	}
[34]	687
[43]	688	var channels string
	689	if err := parseMessageParams(msg, &channels); err != nil {
	690	return err
[34]	691	}
	692
[178]	693	var reason string
	694	if len(msg.Params) > 1 {
	695	reason = msg.Params[1]
	696	}
	697
[43]	698	for _, ch := range strings.Split(channels, ",") {
[55]	699	if msg.Prefix.Name == uc.nick {
	700	uc.logger.Printf("parted channel %q", ch)
	701	delete(uc.channels, ch)
[34]	702	} else {
[55]	703	ch, err := uc.getChannel(ch)
[34]	704	if err != nil {
	705	return err
	706	}
	707	delete(ch.Members, msg.Prefix.Name)
	708	}
[69]	709
[178]	710	uc.AppendLog(ch, "*** Parts: %s (%s@%s) (%s)", msg.Prefix.Name, msg.Prefix.User, msg.Prefix.Host, reason)
	711
[73]	712	uc.forEachDownstream(func(dc *downstreamConn) {
[69]	713	dc.SendMessage(&irc.Message{
	714	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	715	Command: "PART",
	716	Params: []string{dc.marshalChannel(uc, ch)},
	717	})
	718	})
[34]	719	}
[159]	720	case "KICK":
	721	if msg.Prefix == nil {
	722	return fmt.Errorf("expected a prefix")
	723	}
	724
	725	var channel, user string
	726	if err := parseMessageParams(msg, &channel, &user); err != nil {
	727	return err
	728	}
	729
	730	var reason string
	731	if len(msg.Params) > 2 {
	732	reason = msg.Params[1]
	733	}
	734
	735	if user == uc.nick {
	736	uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
	737	delete(uc.channels, channel)
	738	} else {
	739	ch, err := uc.getChannel(channel)
	740	if err != nil {
	741	return err
	742	}
	743	delete(ch.Members, user)
	744	}
	745
[178]	746	uc.AppendLog(channel, "*** %s was kicked by %s (%s)", user, msg.Prefix.Name, reason)
	747
[159]	748	uc.forEachDownstream(func(dc *downstreamConn) {
	749	params := []string{dc.marshalChannel(uc, channel), dc.marshalNick(uc, user)}
	750	if reason != "" {
	751	params = append(params, reason)
	752	}
	753	dc.SendMessage(&irc.Message{
	754	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	755	Command: "KICK",
	756	Params: params,
	757	})
	758	})
[83]	759	case "QUIT":
	760	if msg.Prefix == nil {
	761	return fmt.Errorf("expected a prefix")
	762	}
	763
[178]	764	var reason string
	765	if len(msg.Params) > 0 {
	766	reason = msg.Params[0]
	767	}
	768
[83]	769	if msg.Prefix.Name == uc.nick {
	770	uc.logger.Printf("quit")
	771	}
	772
	773	for _, ch := range uc.channels {
[178]	774	if _, ok := ch.Members[msg.Prefix.Name]; ok {
	775	delete(ch.Members, msg.Prefix.Name)
	776
	777	uc.AppendLog(ch.Name, "*** Quits: %s (%s@%s) (%s)", msg.Prefix.Name, msg.Prefix.User, msg.Prefix.Host, reason)
	778	}
[83]	779	}
	780
	781	if msg.Prefix.Name != uc.nick {
	782	uc.forEachDownstream(func(dc *downstreamConn) {
	783	dc.SendMessage(&irc.Message{
	784	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	785	Command: "QUIT",
	786	Params: msg.Params,
	787	})
	788	})
	789	}
[19]	790	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	791	var name, topic string
	792	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	793	return err
[19]	794	}
[55]	795	ch, err := uc.getChannel(name)
[19]	796	if err != nil {
	797	return err
	798	}
	799	if msg.Command == irc.RPL_TOPIC {
[43]	800	ch.Topic = topic
[19]	801	} else {
	802	ch.Topic = ""
	803	}
	804	case "TOPIC":
[43]	805	var name string
[74]	806	if err := parseMessageParams(msg, &name); err != nil {
[43]	807	return err
[19]	808	}
[55]	809	ch, err := uc.getChannel(name)
[19]	810	if err != nil {
	811	return err
	812	}
	813	if len(msg.Params) > 1 {
	814	ch.Topic = msg.Params[1]
	815	} else {
	816	ch.Topic = ""
	817	}
[74]	818	uc.forEachDownstream(func(dc *downstreamConn) {
	819	params := []string{dc.marshalChannel(uc, name)}
	820	if ch.Topic != "" {
	821	params = append(params, ch.Topic)
	822	}
	823	dc.SendMessage(&irc.Message{
	824	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	825	Command: "TOPIC",
	826	Params: params,
	827	})
	828	})
[139]	829	case "MODE":
	830	var name, modeStr string
	831	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	832	return err
	833	}
	834
	835	if !uc.isChannel(name) { // user mode change
	836	if name != uc.nick {
	837	return fmt.Errorf("received MODE message for unknown nick %q", name)
	838	}
	839	return uc.modes.Apply(modeStr)
	840	// TODO: notify downstreams about user mode change?
	841	} else { // channel mode change
	842	ch, err := uc.getChannel(name)
	843	if err != nil {
	844	return err
	845	}
	846
	847	if ch.modes != nil {
	848	if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[2:]...); err != nil {
	849	return err
	850	}
	851	}
	852
[178]	853	modeMsg := modeStr
	854	for _, v := range msg.Params[2:] {
	855	modeMsg += " " + v
	856	}
	857	uc.AppendLog(ch.Name, "*** %s sets mode: %s", msg.Prefix.Name, modeMsg)
	858
[139]	859	uc.forEachDownstream(func(dc *downstreamConn) {
	860	params := []string{dc.marshalChannel(uc, name), modeStr}
	861	params = append(params, msg.Params[2:]...)
	862
	863	dc.SendMessage(&irc.Message{
	864	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	865	Command: "MODE",
	866	Params: params,
	867	})
	868	})
	869	}
	870	case irc.RPL_UMODEIS:
	871	if err := parseMessageParams(msg, nil); err != nil {
	872	return err
	873	}
	874	modeStr := ""
	875	if len(msg.Params) > 1 {
	876	modeStr = msg.Params[1]
	877	}
	878
	879	uc.modes = ""
	880	if err := uc.modes.Apply(modeStr); err != nil {
	881	return err
	882	}
	883	// TODO: send RPL_UMODEIS to downstream connections when applicable
	884	case irc.RPL_CHANNELMODEIS:
	885	var channel string
	886	if err := parseMessageParams(msg, nil, &channel); err != nil {
	887	return err
	888	}
	889	modeStr := ""
	890	if len(msg.Params) > 2 {
	891	modeStr = msg.Params[2]
	892	}
	893
	894	ch, err := uc.getChannel(channel)
	895	if err != nil {
	896	return err
	897	}
	898
	899	firstMode := ch.modes == nil
	900	ch.modes = make(map[byte]string)
	901	if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[3:]...); err != nil {
	902	return err
	903	}
	904	if firstMode {
	905	modeStr, modeParams := ch.modes.Format()
	906
	907	uc.forEachDownstream(func(dc *downstreamConn) {
	908	params := []string{dc.nick, dc.marshalChannel(uc, channel), modeStr}
	909	params = append(params, modeParams...)
	910
	911	dc.SendMessage(&irc.Message{
	912	Prefix: dc.srv.prefix(),
	913	Command: irc.RPL_CHANNELMODEIS,
	914	Params: params,
	915	})
	916	})
	917	}
[162]	918	case rpl_creationtime:
	919	var channel, creationTime string
	920	if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
	921	return err
	922	}
	923
	924	ch, err := uc.getChannel(channel)
	925	if err != nil {
	926	return err
	927	}
	928
	929	firstCreationTime := ch.creationTime == ""
	930	ch.creationTime = creationTime
	931	if firstCreationTime {
	932	uc.forEachDownstream(func(dc *downstreamConn) {
	933	dc.SendMessage(&irc.Message{
	934	Prefix: dc.srv.prefix(),
	935	Command: rpl_creationtime,
	936	Params: []string{dc.nick, channel, creationTime},
	937	})
	938	})
	939	}
[19]	940	case rpl_topicwhotime:
[43]	941	var name, who, timeStr string
	942	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	943	return err
[19]	944	}
[55]	945	ch, err := uc.getChannel(name)
[19]	946	if err != nil {
	947	return err
	948	}
[43]	949	ch.TopicWho = who
	950	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	951	if err != nil {
	952	return fmt.Errorf("failed to parse topic time: %v", err)
	953	}
	954	ch.TopicTime = time.Unix(sec, 0)
[177]	955	case irc.RPL_LIST:
	956	var channel, clients, topic string
	957	if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
	958	return err
	959	}
	960
[181]	961	pl := uc.getPendingLIST()
[177]	962	if pl == nil {
	963	return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
	964	}
	965
	966	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	967	dc.SendMessage(&irc.Message{
	968	Prefix: dc.srv.prefix(),
	969	Command: irc.RPL_LIST,
	970	Params: []string{dc.nick, dc.marshalChannel(uc, channel), clients, topic},
	971	})
	972	})
	973	case irc.RPL_LISTEND:
[181]	974	ok := uc.endPendingLISTs(false)
[177]	975	if !ok {
	976	return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
	977	}
[19]	978	case irc.RPL_NAMREPLY:
[43]	979	var name, statusStr, members string
	980	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	981	return err
[19]	982	}
[140]	983
	984	ch, ok := uc.channels[name]
	985	if !ok {
	986	// NAMES on a channel we have not joined, forward to downstream
[161]	987	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[140]	988	channel := dc.marshalChannel(uc, name)
[174]	989	members := splitSpace(members)
[140]	990	for i, member := range members {
	991	membership, nick := uc.parseMembershipPrefix(member)
	992	members[i] = membership.String() + dc.marshalNick(uc, nick)
	993	}
	994	memberStr := strings.Join(members, " ")
	995
	996	dc.SendMessage(&irc.Message{
	997	Prefix: dc.srv.prefix(),
	998	Command: irc.RPL_NAMREPLY,
	999	Params: []string{dc.nick, statusStr, channel, memberStr},
	1000	})
	1001	})
	1002	return nil
[19]	1003	}
	1004
[43]	1005	status, err := parseChannelStatus(statusStr)
[19]	1006	if err != nil {
	1007	return err
	1008	}
	1009	ch.Status = status
	1010
[174]	1011	for _, s := range splitSpace(members) {
[139]	1012	membership, nick := uc.parseMembershipPrefix(s)
[19]	1013	ch.Members[nick] = membership
	1014	}
	1015	case irc.RPL_ENDOFNAMES:
[43]	1016	var name string
	1017	if err := parseMessageParams(msg, nil, &name); err != nil {
	1018	return err
[25]	1019	}
[140]	1020
	1021	ch, ok := uc.channels[name]
	1022	if !ok {
	1023	// NAMES on a channel we have not joined, forward to downstream
[161]	1024	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[140]	1025	channel := dc.marshalChannel(uc, name)
	1026
	1027	dc.SendMessage(&irc.Message{
	1028	Prefix: dc.srv.prefix(),
	1029	Command: irc.RPL_ENDOFNAMES,
	1030	Params: []string{dc.nick, channel, "End of /NAMES list"},
	1031	})
	1032	})
	1033	return nil
[25]	1034	}
	1035
[34]	1036	if ch.complete {
	1037	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	1038	}
[25]	1039	ch.complete = true
[27]	1040
[73]	1041	uc.forEachDownstream(func(dc *downstreamConn) {
[27]	1042	forwardChannel(dc, ch)
[40]	1043	})
[127]	1044	case irc.RPL_WHOREPLY:
	1045	var channel, username, host, server, nick, mode, trailing string
	1046	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	1047	return err
	1048	}
	1049
	1050	parts := strings.SplitN(trailing, " ", 2)
	1051	if len(parts) != 2 {
	1052	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	1053	}
	1054	realname := parts[1]
	1055	hops, err := strconv.Atoi(parts[0])
	1056	if err != nil {
	1057	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	1058	}
	1059	hops++
	1060
	1061	trailing = strconv.Itoa(hops) + " " + realname
	1062
[161]	1063	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1064	channel := channel
	1065	if channel != "*" {
	1066	channel = dc.marshalChannel(uc, channel)
	1067	}
	1068	nick := dc.marshalNick(uc, nick)
	1069	dc.SendMessage(&irc.Message{
	1070	Prefix: dc.srv.prefix(),
	1071	Command: irc.RPL_WHOREPLY,
	1072	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	1073	})
	1074	})
	1075	case irc.RPL_ENDOFWHO:
	1076	var name string
	1077	if err := parseMessageParams(msg, nil, &name); err != nil {
	1078	return err
	1079	}
	1080
[161]	1081	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1082	name := name
	1083	if name != "*" {
	1084	// TODO: support WHO masks
	1085	name = dc.marshalEntity(uc, name)
	1086	}
	1087	dc.SendMessage(&irc.Message{
	1088	Prefix: dc.srv.prefix(),
	1089	Command: irc.RPL_ENDOFWHO,
[142]	1090	Params: []string{dc.nick, name, "End of /WHO list"},
[127]	1091	})
	1092	})
[128]	1093	case irc.RPL_WHOISUSER:
	1094	var nick, username, host, realname string
	1095	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	1096	return err
	1097	}
	1098
[161]	1099	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1100	nick := dc.marshalNick(uc, nick)
	1101	dc.SendMessage(&irc.Message{
	1102	Prefix: dc.srv.prefix(),
	1103	Command: irc.RPL_WHOISUSER,
	1104	Params: []string{dc.nick, nick, username, host, "*", realname},
	1105	})
	1106	})
	1107	case irc.RPL_WHOISSERVER:
	1108	var nick, server, serverInfo string
	1109	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	1110	return err
	1111	}
	1112
[161]	1113	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1114	nick := dc.marshalNick(uc, nick)
	1115	dc.SendMessage(&irc.Message{
	1116	Prefix: dc.srv.prefix(),
	1117	Command: irc.RPL_WHOISSERVER,
	1118	Params: []string{dc.nick, nick, server, serverInfo},
	1119	})
	1120	})
	1121	case irc.RPL_WHOISOPERATOR:
	1122	var nick string
	1123	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1124	return err
	1125	}
	1126
[161]	1127	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1128	nick := dc.marshalNick(uc, nick)
	1129	dc.SendMessage(&irc.Message{
	1130	Prefix: dc.srv.prefix(),
	1131	Command: irc.RPL_WHOISOPERATOR,
	1132	Params: []string{dc.nick, nick, "is an IRC operator"},
	1133	})
	1134	})
	1135	case irc.RPL_WHOISIDLE:
	1136	var nick string
	1137	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	1138	return err
	1139	}
	1140
[161]	1141	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1142	nick := dc.marshalNick(uc, nick)
	1143	params := []string{dc.nick, nick}
	1144	params = append(params, msg.Params[2:]...)
	1145	dc.SendMessage(&irc.Message{
	1146	Prefix: dc.srv.prefix(),
	1147	Command: irc.RPL_WHOISIDLE,
	1148	Params: params,
	1149	})
	1150	})
	1151	case irc.RPL_WHOISCHANNELS:
	1152	var nick, channelList string
	1153	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	1154	return err
	1155	}
[174]	1156	channels := splitSpace(channelList)
[128]	1157
[161]	1158	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1159	nick := dc.marshalNick(uc, nick)
	1160	channelList := make([]string, len(channels))
	1161	for i, channel := range channels {
[139]	1162	prefix, channel := uc.parseMembershipPrefix(channel)
[128]	1163	channel = dc.marshalChannel(uc, channel)
	1164	channelList[i] = prefix.String() + channel
	1165	}
	1166	channels := strings.Join(channelList, " ")
	1167	dc.SendMessage(&irc.Message{
	1168	Prefix: dc.srv.prefix(),
	1169	Command: irc.RPL_WHOISCHANNELS,
	1170	Params: []string{dc.nick, nick, channels},
	1171	})
	1172	})
	1173	case irc.RPL_ENDOFWHOIS:
	1174	var nick string
	1175	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1176	return err
	1177	}
	1178
[161]	1179	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1180	nick := dc.marshalNick(uc, nick)
	1181	dc.SendMessage(&irc.Message{
	1182	Prefix: dc.srv.prefix(),
	1183	Command: irc.RPL_ENDOFWHOIS,
[142]	1184	Params: []string{dc.nick, nick, "End of /WHOIS list"},
[128]	1185	})
	1186	})
[36]	1187	case "PRIVMSG":
[117]	1188	if msg.Prefix == nil {
	1189	return fmt.Errorf("expected a prefix")
	1190	}
	1191
[178]	1192	var nick, text string
	1193	if err := parseMessageParams(msg, &nick, &text); err != nil {
[69]	1194	return err
	1195	}
[117]	1196
	1197	if msg.Prefix.Name == serviceNick {
	1198	uc.logger.Printf("skipping PRIVMSG from soju's service: %v", msg)
	1199	break
	1200	}
	1201	if nick == serviceNick {
	1202	uc.logger.Printf("skipping PRIVMSG to soju's service: %v", msg)
	1203	break
	1204	}
	1205
[178]	1206	target := nick
	1207	if nick == uc.nick {
	1208	target = msg.Prefix.Name
	1209	}
	1210	uc.AppendLog(target, "<%s> %s", msg.Prefix.Name, text)
	1211
[143]	1212	uc.network.ring.Produce(msg)
[115]	1213	case "INVITE":
	1214	var nick string
	1215	var channel string
	1216	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1217	return err
	1218	}
	1219
	1220	uc.forEachDownstream(func(dc *downstreamConn) {
	1221	dc.SendMessage(&irc.Message{
	1222	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	1223	Command: "INVITE",
	1224	Params: []string{dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
	1225	})
	1226	})
[163]	1227	case irc.RPL_INVITING:
	1228	var nick string
	1229	var channel string
	1230	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1231	return err
	1232	}
	1233
	1234	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1235	dc.SendMessage(&irc.Message{
	1236	Prefix: dc.srv.prefix(),
	1237	Command: irc.RPL_INVITING,
	1238	Params: []string{dc.nick, dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
	1239	})
	1240	})
[177]	1241	case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
	1242	var command, reason string
	1243	if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
	1244	return err
	1245	}
	1246
	1247	if command == "LIST" {
[181]	1248	ok := uc.endPendingLISTs(false)
[177]	1249	if !ok {
	1250	return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
	1251	}
	1252	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1253	dc.SendMessage(&irc.Message{
	1254	Prefix: uc.srv.prefix(),
	1255	Command: msg.Command,
	1256	Params: []string{dc.nick, "LIST", reason},
	1257	})
	1258	})
	1259	}
[152]	1260	case "TAGMSG":
	1261	// TODO: relay to downstream connections that accept message-tags
[155]	1262	case "ACK":
	1263	// Ignore
[16]	1264	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	1265	// Ignore
	1266	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	1267	// Ignore
	1268	case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
	1269	// Ignore
[177]	1270	case irc.RPL_LISTSTART:
	1271	// Ignore
[14]	1272	case rpl_localusers, rpl_globalusers:
	1273	// Ignore
[96]	1274	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	1275	// Ignore
[13]	1276	default:
[95]	1277	uc.logger.Printf("unhandled message: %v", msg)
[13]	1278	}
[14]	1279	return nil
[13]	1280	}
	1281
[174]	1282	func splitSpace(s string) []string {
	1283	return strings.FieldsFunc(s, func(r rune) bool {
	1284	return r == ' '
	1285	})
	1286	}
	1287
[55]	1288	func (uc *upstreamConn) register() {
[77]	1289	uc.nick = uc.network.Nick
	1290	uc.username = uc.network.Username
	1291	if uc.username == "" {
	1292	uc.username = uc.nick
	1293	}
	1294	uc.realname = uc.network.Realname
	1295	if uc.realname == "" {
	1296	uc.realname = uc.nick
	1297	}
	1298
[60]	1299	uc.SendMessage(&irc.Message{
[92]	1300	Command: "CAP",
	1301	Params: []string{"LS", "302"},
	1302	})
	1303
[93]	1304	if uc.network.Pass != "" {
	1305	uc.SendMessage(&irc.Message{
	1306	Command: "PASS",
	1307	Params: []string{uc.network.Pass},
	1308	})
	1309	}
	1310
[92]	1311	uc.SendMessage(&irc.Message{
[13]	1312	Command: "NICK",
[69]	1313	Params: []string{uc.nick},
[60]	1314	})
	1315	uc.SendMessage(&irc.Message{
[13]	1316	Command: "USER",
[77]	1317	Params: []string{uc.username, "0", "*", uc.realname},
[60]	1318	})
[44]	1319	}
[13]	1320
[95]	1321	func (uc *upstreamConn) requestSASL() bool {
	1322	if uc.network.SASL.Mechanism == "" {
	1323	return false
	1324	}
	1325
	1326	v, ok := uc.caps["sasl"]
	1327	if !ok {
	1328	return false
	1329	}
	1330	if v != "" {
	1331	mechanisms := strings.Split(v, ",")
	1332	found := false
	1333	for _, mech := range mechanisms {
	1334	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	1335	found = true
	1336	break
	1337	}
	1338	}
	1339	if !found {
	1340	return false
	1341	}
	1342	}
	1343
	1344	return true
	1345	}
	1346
	1347	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	1348	auth := &uc.network.SASL
	1349	switch name {
	1350	case "sasl":
	1351	if !ok {
	1352	uc.logger.Printf("server refused to acknowledge the SASL capability")
	1353	return nil
	1354	}
	1355
	1356	switch auth.Mechanism {
	1357	case "PLAIN":
	1358	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	1359	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
	1360	default:
	1361	return fmt.Errorf("unsupported SASL mechanism %q", name)
	1362	}
	1363
	1364	uc.SendMessage(&irc.Message{
	1365	Command: "AUTHENTICATE",
	1366	Params: []string{auth.Mechanism},
	1367	})
[152]	1368	case "message-tags":
	1369	uc.tagsSupported = ok
[155]	1370	case "labeled-response":
	1371	uc.labelsSupported = ok
[95]	1372	}
	1373	return nil
	1374	}
	1375
[165]	1376	func (uc *upstreamConn) readMessages(ch chan<- event) error {
[13]	1377	for {
[55]	1378	msg, err := uc.irc.ReadMessage()
[13]	1379	if err == io.EOF {
	1380	break
	1381	} else if err != nil {
	1382	return fmt.Errorf("failed to read IRC command: %v", err)
	1383	}
	1384
[64]	1385	if uc.srv.Debug {
	1386	uc.logger.Printf("received: %v", msg)
	1387	}
	1388
[165]	1389	ch <- eventUpstreamMessage{msg, uc}
[13]	1390	}
	1391
[45]	1392	return nil
[13]	1393	}
[60]	1394
[180]	1395	// SendMessage queues a new outgoing message. It is safe to call from any
	1396	// goroutine.
[60]	1397	func (uc upstreamConn) SendMessage(msg irc.Message) {
[102]	1398	uc.outgoing <- msg
[60]	1399	}
[155]	1400
[176]	1401	func (uc upstreamConn) SendMessageLabeled(downstreamID uint64, msg irc.Message) {
[155]	1402	if uc.labelsSupported {
	1403	if msg.Tags == nil {
	1404	msg.Tags = make(map[string]irc.TagValue)
	1405	}
[176]	1406	msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
[161]	1407	uc.nextLabelID++
[155]	1408	}
	1409	uc.SendMessage(msg)
	1410	}
[178]	1411
	1412	// TODO: handle moving logs when a network name changes, when support for this is added
	1413	func (uc *upstreamConn) AppendLog(entity string, format string, a ...interface{}) {
	1414	if uc.srv.LogPath == "" {
	1415	return
	1416	}
	1417	// TODO: enforce maximum open file handles (LRU cache of file handles)
	1418	// TODO: handle non-monotonic clock behaviour
	1419	now := time.Now()
	1420	year, month, day := now.Date()
	1421	name := fmt.Sprintf("%04d-%02d-%02d.log", year, month, day)
	1422	log, ok := uc.logs[entity]
	1423	if !ok \|\| log.name != name {
	1424	if ok {
	1425	log.file.Close()
	1426	delete(uc.logs, entity)
	1427	}
	1428	// TODO: handle/forbid network/entity names with illegal path characters
	1429	dir := filepath.Join(uc.srv.LogPath, uc.user.Username, uc.network.Name, entity)
	1430	if err := os.MkdirAll(dir, 0600); err != nil {
	1431	uc.logger.Printf("failed to log message: could not create logs directory %q: %v", dir, err)
	1432	return
	1433	}
	1434	path := filepath.Join(dir, name)
	1435	f, err := os.OpenFile(path, os.O_RDWR\|os.O_CREATE\|os.O_APPEND, 0600)
	1436	if err != nil {
	1437	uc.logger.Printf("failed to log message: could not open or create log file %q: %v", path, err)
	1438	return
	1439	}
	1440	log = entityLog{
	1441	name: name,
	1442	file: f,
	1443	}
	1444	uc.logs[entity] = log
	1445	}
	1446
	1447	format = "[%02d:%02d:%02d] " + format + "\n"
	1448	args := []interface{}{now.Hour(), now.Minute(), now.Second()}
	1449	args = append(args, a...)
	1450
	1451	if _, err := fmt.Fprintf(log.file, format, args...); err != nil {
	1452	uc.logger.Printf("failed to log message to %q: %v", log.name, err)
	1453	}
	1454	}

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