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source: code/trunk/upstream.go@ 195

Last change on this file since 195 was 195, checked in by contact, 5 years ago

Fix log dir permission

We need the permission to list files in the dir.

File size: 36.4 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,
[186]	101	closed: make(chan struct{}),
[177]	102	channels: make(map[string]*upstreamChannel),
	103	caps: make(map[string]string),
	104	batches: make(map[string]batch),
	105	availableChannelTypes: stdChannelTypes,
	106	availableChannelModes: stdChannelModes,
	107	availableMemberships: stdMemberships,
	108	pendingLISTDownstreamSet: make(map[uint64]struct{}),
[178]	109	logs: make(map[string]entityLog),
[33]	110	}
	111
	112	go func() {
[175]	113	for {
	114	var closed bool
	115	select {
	116	case msg := <-outgoing:
	117	if uc.srv.Debug {
	118	uc.logger.Printf("sent: %v", msg)
	119	}
	120	if err := uc.irc.WriteMessage(msg); err != nil {
	121	uc.logger.Printf("failed to write message: %v", err)
	122	}
	123	case <-uc.closed:
	124	closed = true
[64]	125	}
[175]	126	if closed {
	127	break
[33]	128	}
	129	}
[55]	130	if err := uc.net.Close(); err != nil {
	131	uc.logger.Printf("failed to close connection: %v", err)
[45]	132	} else {
[55]	133	uc.logger.Printf("connection closed")
[45]	134	}
[33]	135	}()
	136
[55]	137	return uc, nil
[33]	138	}
	139
[175]	140	func (uc *upstreamConn) isClosed() bool {
	141	select {
	142	case <-uc.closed:
	143	return true
	144	default:
	145	return false
	146	}
	147	}
	148
[180]	149	// Close closes the connection. It is safe to call from any goroutine.
[55]	150	func (uc *upstreamConn) Close() error {
[175]	151	if uc.isClosed() {
[33]	152	return fmt.Errorf("upstream connection already closed")
	153	}
[175]	154	close(uc.closed)
[33]	155	return nil
	156	}
	157
[73]	158	func (uc upstreamConn) forEachDownstream(f func(downstreamConn)) {
	159	uc.user.forEachDownstream(func(dc *downstreamConn) {
[77]	160	if dc.network != nil && dc.network != uc.network {
[73]	161	return
	162	}
	163	f(dc)
	164	})
	165	}
	166
[161]	167	func (uc upstreamConn) forEachDownstreamByID(id uint64, f func(downstreamConn)) {
[155]	168	uc.forEachDownstream(func(dc *downstreamConn) {
	169	if id != 0 && id != dc.id {
	170	return
	171	}
	172	f(dc)
	173	})
	174	}
	175
[55]	176	func (uc upstreamConn) getChannel(name string) (upstreamChannel, error) {
	177	ch, ok := uc.channels[name]
[19]	178	if !ok {
	179	return nil, fmt.Errorf("unknown channel %q", name)
	180	}
	181	return ch, nil
	182	}
	183
[129]	184	func (uc *upstreamConn) isChannel(entity string) bool {
[139]	185	if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
	186	return true
[129]	187	}
	188	return false
	189	}
	190
[181]	191	func (uc upstreamConn) getPendingLIST() pendingLIST {
[177]	192	for _, pl := range uc.user.pendingLISTs {
	193	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	194	continue
	195	}
	196	return &pl
	197	}
	198	return nil
	199	}
	200
[181]	201	func (uc *upstreamConn) endPendingLISTs(all bool) (found bool) {
[177]	202	found = false
	203	for i := 0; i < len(uc.user.pendingLISTs); i++ {
	204	pl := uc.user.pendingLISTs[i]
	205	if _, ok := pl.pendingCommands[uc.network.ID]; !ok {
	206	continue
	207	}
	208	delete(pl.pendingCommands, uc.network.ID)
	209	if len(pl.pendingCommands) == 0 {
	210	uc.user.pendingLISTs = append(uc.user.pendingLISTs[:i], uc.user.pendingLISTs[i+1:]...)
	211	i--
	212	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	213	dc.SendMessage(&irc.Message{
	214	Prefix: dc.srv.prefix(),
	215	Command: irc.RPL_LISTEND,
	216	Params: []string{dc.nick, "End of /LIST"},
	217	})
	218	})
	219	}
	220	found = true
	221	if !all {
	222	delete(uc.pendingLISTDownstreamSet, pl.downstreamID)
	223	uc.user.forEachUpstream(func(uc *upstreamConn) {
[181]	224	uc.trySendLIST(pl.downstreamID)
[177]	225	})
	226	return
	227	}
	228	}
	229	return
	230	}
	231
[181]	232	func (uc *upstreamConn) trySendLIST(downstreamID uint64) {
[177]	233	// must be called with a lock in uc.user.pendingLISTsLock
	234
	235	if _, ok := uc.pendingLISTDownstreamSet[downstreamID]; ok {
	236	// a LIST command is already pending
	237	// we will try again when that command is completed
	238	return
	239	}
	240
	241	for _, pl := range uc.user.pendingLISTs {
	242	if pl.downstreamID != downstreamID {
	243	continue
	244	}
	245	// this is the first pending LIST command list of the downstream
	246	listCommand, ok := pl.pendingCommands[uc.network.ID]
	247	if !ok {
	248	// there is no command for this upstream in these LIST commands
	249	// do not send anything
	250	continue
	251	}
	252	// there is a command for this upstream in these LIST commands
	253	// send it now
	254
	255	uc.SendMessageLabeled(downstreamID, listCommand)
	256
	257	uc.pendingLISTDownstreamSet[downstreamID] = struct{}{}
	258	return
	259	}
	260	}
	261
[139]	262	func (uc upstreamConn) parseMembershipPrefix(s string) (membership membership, nick string) {
	263	for _, m := range uc.availableMemberships {
	264	if m.Prefix == s[0] {
	265	return &m, s[1:]
	266	}
	267	}
	268	return nil, s
	269	}
	270
[55]	271	func (uc upstreamConn) handleMessage(msg irc.Message) error {
[155]	272	var label string
	273	if l, ok := msg.GetTag("label"); ok {
	274	label = l
	275	}
	276
[153]	277	var msgBatch *batch
	278	if batchName, ok := msg.GetTag("batch"); ok {
	279	b, ok := uc.batches[batchName]
	280	if !ok {
	281	return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
	282	}
	283	msgBatch = &b
[155]	284	if label == "" {
	285	label = msgBatch.Label
	286	}
[153]	287	}
	288
[161]	289	var downstreamID uint64 = 0
[155]	290	if label != "" {
	291	var labelOffset uint64
[161]	292	n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
[155]	293	if err == nil && n < 2 {
	294	err = errors.New("not enough arguments")
	295	}
	296	if err != nil {
	297	return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
	298	}
	299	}
	300
[13]	301	switch msg.Command {
	302	case "PING":
[60]	303	uc.SendMessage(&irc.Message{
[13]	304	Command: "PONG",
[68]	305	Params: msg.Params,
[60]	306	})
[33]	307	return nil
[18]	308	case "NOTICE":
[55]	309	uc.logger.Print(msg)
[97]	310
[171]	311	if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
	312	uc.forEachDownstream(func(dc *downstreamConn) {
[192]	313	dc.SendMessage(&irc.Message{
	314	Command: "NOTICE",
	315	Params: msg.Params,
	316	})
[171]	317	})
	318	} else { // regular user NOTICE
	319	var nick, text string
	320	if err := parseMessageParams(msg, &nick, &text); err != nil {
	321	return err
	322	}
	323
[178]	324	target := nick
	325	if nick == uc.nick {
	326	target = msg.Prefix.Name
	327	}
[187]	328	uc.appendLog(target, "<%s> %s", msg.Prefix.Name, text)
[178]	329
[171]	330	uc.forEachDownstream(func(dc *downstreamConn) {
	331	dc.SendMessage(&irc.Message{
	332	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	333	Command: "NOTICE",
	334	Params: []string{dc.marshalEntity(uc, nick), text},
	335	})
	336	})
	337	}
[92]	338	case "CAP":
[95]	339	var subCmd string
	340	if err := parseMessageParams(msg, nil, &subCmd); err != nil {
	341	return err
[92]	342	}
[95]	343	subCmd = strings.ToUpper(subCmd)
	344	subParams := msg.Params[2:]
	345	switch subCmd {
	346	case "LS":
	347	if len(subParams) < 1 {
	348	return newNeedMoreParamsError(msg.Command)
	349	}
	350	caps := strings.Fields(subParams[len(subParams)-1])
	351	more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
[92]	352
[95]	353	for _, s := range caps {
	354	kv := strings.SplitN(s, "=", 2)
	355	k := strings.ToLower(kv[0])
	356	var v string
	357	if len(kv) == 2 {
	358	v = kv[1]
	359	}
	360	uc.caps[k] = v
[92]	361	}
	362
[95]	363	if more {
	364	break // wait to receive all capabilities
	365	}
	366
[152]	367	requestCaps := make([]string, 0, 16)
[193]	368	for _, c := range []string{"message-tags", "batch", "labeled-response", "server-time"} {
[152]	369	if _, ok := uc.caps[c]; ok {
	370	requestCaps = append(requestCaps, c)
	371	}
	372	}
	373
[95]	374	if uc.requestSASL() {
[152]	375	requestCaps = append(requestCaps, "sasl")
	376	}
	377
	378	if len(requestCaps) > 0 {
[95]	379	uc.SendMessage(&irc.Message{
	380	Command: "CAP",
[152]	381	Params: []string{"REQ", strings.Join(requestCaps, " ")},
[95]	382	})
[152]	383	}
	384
	385	if uc.requestSASL() {
[95]	386	break // we'll send CAP END after authentication is completed
	387	}
	388
[92]	389	uc.SendMessage(&irc.Message{
	390	Command: "CAP",
	391	Params: []string{"END"},
	392	})
[95]	393	case "ACK", "NAK":
	394	if len(subParams) < 1 {
	395	return newNeedMoreParamsError(msg.Command)
	396	}
	397	caps := strings.Fields(subParams[0])
	398
	399	for _, name := range caps {
	400	if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
	401	return err
	402	}
	403	}
	404
	405	if uc.saslClient == nil {
	406	uc.SendMessage(&irc.Message{
	407	Command: "CAP",
	408	Params: []string{"END"},
	409	})
	410	}
	411	default:
	412	uc.logger.Printf("unhandled message: %v", msg)
[92]	413	}
[95]	414	case "AUTHENTICATE":
	415	if uc.saslClient == nil {
	416	return fmt.Errorf("received unexpected AUTHENTICATE message")
	417	}
	418
	419	// TODO: if a challenge is 400 bytes long, buffer it
	420	var challengeStr string
	421	if err := parseMessageParams(msg, &challengeStr); err != nil {
	422	uc.SendMessage(&irc.Message{
	423	Command: "AUTHENTICATE",
	424	Params: []string{"*"},
	425	})
	426	return err
	427	}
	428
	429	var challenge []byte
	430	if challengeStr != "+" {
	431	var err error
	432	challenge, err = base64.StdEncoding.DecodeString(challengeStr)
	433	if err != nil {
	434	uc.SendMessage(&irc.Message{
	435	Command: "AUTHENTICATE",
	436	Params: []string{"*"},
	437	})
	438	return err
	439	}
	440	}
	441
	442	var resp []byte
	443	var err error
	444	if !uc.saslStarted {
	445	_, resp, err = uc.saslClient.Start()
	446	uc.saslStarted = true
	447	} else {
	448	resp, err = uc.saslClient.Next(challenge)
	449	}
	450	if err != nil {
	451	uc.SendMessage(&irc.Message{
	452	Command: "AUTHENTICATE",
	453	Params: []string{"*"},
	454	})
	455	return err
	456	}
	457
	458	// TODO: send response in multiple chunks if >= 400 bytes
	459	var respStr = "+"
	460	if resp != nil {
	461	respStr = base64.StdEncoding.EncodeToString(resp)
	462	}
	463
	464	uc.SendMessage(&irc.Message{
	465	Command: "AUTHENTICATE",
	466	Params: []string{respStr},
	467	})
[125]	468	case irc.RPL_LOGGEDIN:
[95]	469	var account string
	470	if err := parseMessageParams(msg, nil, nil, &account); err != nil {
	471	return err
	472	}
	473	uc.logger.Printf("logged in with account %q", account)
[125]	474	case irc.RPL_LOGGEDOUT:
[95]	475	uc.logger.Printf("logged out")
[125]	476	case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
[95]	477	var info string
	478	if err := parseMessageParams(msg, nil, &info); err != nil {
	479	return err
	480	}
	481	switch msg.Command {
[125]	482	case irc.ERR_NICKLOCKED:
[95]	483	uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
[125]	484	case irc.ERR_SASLFAIL:
[95]	485	uc.logger.Printf("SASL authentication failed: %v", info)
[125]	486	case irc.ERR_SASLTOOLONG:
[95]	487	uc.logger.Printf("SASL message too long: %v", info)
	488	}
	489
	490	uc.saslClient = nil
	491	uc.saslStarted = false
	492
	493	uc.SendMessage(&irc.Message{
	494	Command: "CAP",
	495	Params: []string{"END"},
	496	})
[14]	497	case irc.RPL_WELCOME:
[55]	498	uc.registered = true
	499	uc.logger.Printf("connection registered")
[19]	500
[77]	501	channels, err := uc.srv.db.ListChannels(uc.network.ID)
	502	if err != nil {
	503	uc.logger.Printf("failed to list channels from database: %v", err)
	504	break
	505	}
	506
	507	for _, ch := range channels {
[146]	508	params := []string{ch.Name}
	509	if ch.Key != "" {
	510	params = append(params, ch.Key)
	511	}
[60]	512	uc.SendMessage(&irc.Message{
[19]	513	Command: "JOIN",
[146]	514	Params: params,
[60]	515	})
[19]	516	}
[16]	517	case irc.RPL_MYINFO:
[139]	518	if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
[43]	519	return err
[16]	520	}
[139]	521	case irc.RPL_ISUPPORT:
	522	if err := parseMessageParams(msg, nil, nil); err != nil {
	523	return err
[16]	524	}
[139]	525	for _, token := range msg.Params[1 : len(msg.Params)-1] {
	526	negate := false
	527	parameter := token
	528	value := ""
	529	if strings.HasPrefix(token, "-") {
	530	negate = true
	531	token = token[1:]
	532	} else {
	533	if i := strings.IndexByte(token, '='); i >= 0 {
	534	parameter = token[:i]
	535	value = token[i+1:]
	536	}
	537	}
	538	if !negate {
	539	switch parameter {
	540	case "CHANMODES":
	541	parts := strings.SplitN(value, ",", 5)
	542	if len(parts) < 4 {
	543	return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
	544	}
	545	modes := make(map[byte]channelModeType)
	546	for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
	547	for j := 0; j < len(parts[i]); j++ {
	548	mode := parts[i][j]
	549	modes[mode] = mt
	550	}
	551	}
	552	uc.availableChannelModes = modes
	553	case "CHANTYPES":
	554	uc.availableChannelTypes = value
	555	case "PREFIX":
	556	if value == "" {
	557	uc.availableMemberships = nil
	558	} else {
	559	if value[0] != '(' {
	560	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	561	}
	562	sep := strings.IndexByte(value, ')')
	563	if sep < 0 \|\| len(value) != sep*2 {
	564	return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
	565	}
	566	memberships := make([]membership, len(value)/2-1)
	567	for i := range memberships {
	568	memberships[i] = membership{
	569	Mode: value[i+1],
	570	Prefix: value[sep+i+1],
	571	}
	572	}
	573	uc.availableMemberships = memberships
	574	}
	575	}
	576	} else {
	577	// TODO: handle ISUPPORT negations
	578	}
	579	}
[153]	580	case "BATCH":
	581	var tag string
	582	if err := parseMessageParams(msg, &tag); err != nil {
	583	return err
	584	}
	585
	586	if strings.HasPrefix(tag, "+") {
	587	tag = tag[1:]
	588	if _, ok := uc.batches[tag]; ok {
	589	return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
	590	}
	591	var batchType string
	592	if err := parseMessageParams(msg, nil, &batchType); err != nil {
	593	return err
	594	}
[155]	595	label := label
	596	if label == "" && msgBatch != nil {
	597	label = msgBatch.Label
	598	}
[153]	599	uc.batches[tag] = batch{
	600	Type: batchType,
	601	Params: msg.Params[2:],
	602	Outer: msgBatch,
[155]	603	Label: label,
[153]	604	}
	605	} else if strings.HasPrefix(tag, "-") {
	606	tag = tag[1:]
	607	if _, ok := uc.batches[tag]; !ok {
	608	return fmt.Errorf("unknown BATCH reference tag: %q", tag)
	609	}
	610	delete(uc.batches, tag)
	611	} else {
	612	return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
	613	}
[42]	614	case "NICK":
[83]	615	if msg.Prefix == nil {
	616	return fmt.Errorf("expected a prefix")
	617	}
	618
[43]	619	var newNick string
	620	if err := parseMessageParams(msg, &newNick); err != nil {
	621	return err
[42]	622	}
	623
[55]	624	if msg.Prefix.Name == uc.nick {
	625	uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
	626	uc.nick = newNick
[42]	627	}
	628
[55]	629	for _, ch := range uc.channels {
[42]	630	if membership, ok := ch.Members[msg.Prefix.Name]; ok {
	631	delete(ch.Members, msg.Prefix.Name)
	632	ch.Members[newNick] = membership
[187]	633	uc.appendLog(ch.Name, "*** %s is now known as %s", msg.Prefix.Name, newNick)
[42]	634	}
	635	}
[82]	636
	637	if msg.Prefix.Name != uc.nick {
	638	uc.forEachDownstream(func(dc *downstreamConn) {
	639	dc.SendMessage(&irc.Message{
	640	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	641	Command: "NICK",
	642	Params: []string{newNick},
	643	})
	644	})
	645	}
[69]	646	case "JOIN":
	647	if msg.Prefix == nil {
	648	return fmt.Errorf("expected a prefix")
	649	}
[42]	650
[43]	651	var channels string
	652	if err := parseMessageParams(msg, &channels); err != nil {
	653	return err
[19]	654	}
[34]	655
[43]	656	for _, ch := range strings.Split(channels, ",") {
[55]	657	if msg.Prefix.Name == uc.nick {
	658	uc.logger.Printf("joined channel %q", ch)
	659	uc.channels[ch] = &upstreamChannel{
[34]	660	Name: ch,
[55]	661	conn: uc,
[139]	662	Members: make(map[string]*membership),
[34]	663	}
[139]	664
	665	uc.SendMessage(&irc.Message{
	666	Command: "MODE",
	667	Params: []string{ch},
	668	})
[34]	669	} else {
[55]	670	ch, err := uc.getChannel(ch)
[34]	671	if err != nil {
	672	return err
	673	}
[139]	674	ch.Members[msg.Prefix.Name] = nil
[19]	675	}
[69]	676
[187]	677	uc.appendLog(ch, "*** Joins: %s (%s@%s)", msg.Prefix.Name, msg.Prefix.User, msg.Prefix.Host)
[178]	678
[73]	679	uc.forEachDownstream(func(dc *downstreamConn) {
[69]	680	dc.SendMessage(&irc.Message{
	681	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	682	Command: "JOIN",
	683	Params: []string{dc.marshalChannel(uc, ch)},
	684	})
	685	})
[19]	686	}
[69]	687	case "PART":
	688	if msg.Prefix == nil {
	689	return fmt.Errorf("expected a prefix")
	690	}
[34]	691
[43]	692	var channels string
	693	if err := parseMessageParams(msg, &channels); err != nil {
	694	return err
[34]	695	}
	696
[178]	697	var reason string
	698	if len(msg.Params) > 1 {
	699	reason = msg.Params[1]
	700	}
	701
[43]	702	for _, ch := range strings.Split(channels, ",") {
[55]	703	if msg.Prefix.Name == uc.nick {
	704	uc.logger.Printf("parted channel %q", ch)
	705	delete(uc.channels, ch)
[34]	706	} else {
[55]	707	ch, err := uc.getChannel(ch)
[34]	708	if err != nil {
	709	return err
	710	}
	711	delete(ch.Members, msg.Prefix.Name)
	712	}
[69]	713
[187]	714	uc.appendLog(ch, "*** Parts: %s (%s@%s) (%s)", msg.Prefix.Name, msg.Prefix.User, msg.Prefix.Host, reason)
[178]	715
[73]	716	uc.forEachDownstream(func(dc *downstreamConn) {
[69]	717	dc.SendMessage(&irc.Message{
	718	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	719	Command: "PART",
	720	Params: []string{dc.marshalChannel(uc, ch)},
	721	})
	722	})
[34]	723	}
[159]	724	case "KICK":
	725	if msg.Prefix == nil {
	726	return fmt.Errorf("expected a prefix")
	727	}
	728
	729	var channel, user string
	730	if err := parseMessageParams(msg, &channel, &user); err != nil {
	731	return err
	732	}
	733
	734	var reason string
	735	if len(msg.Params) > 2 {
	736	reason = msg.Params[1]
	737	}
	738
	739	if user == uc.nick {
	740	uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
	741	delete(uc.channels, channel)
	742	} else {
	743	ch, err := uc.getChannel(channel)
	744	if err != nil {
	745	return err
	746	}
	747	delete(ch.Members, user)
	748	}
	749
[187]	750	uc.appendLog(channel, "*** %s was kicked by %s (%s)", user, msg.Prefix.Name, reason)
[178]	751
[159]	752	uc.forEachDownstream(func(dc *downstreamConn) {
	753	params := []string{dc.marshalChannel(uc, channel), dc.marshalNick(uc, user)}
	754	if reason != "" {
	755	params = append(params, reason)
	756	}
	757	dc.SendMessage(&irc.Message{
	758	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	759	Command: "KICK",
	760	Params: params,
	761	})
	762	})
[83]	763	case "QUIT":
	764	if msg.Prefix == nil {
	765	return fmt.Errorf("expected a prefix")
	766	}
	767
[178]	768	var reason string
	769	if len(msg.Params) > 0 {
	770	reason = msg.Params[0]
	771	}
	772
[83]	773	if msg.Prefix.Name == uc.nick {
	774	uc.logger.Printf("quit")
	775	}
	776
	777	for _, ch := range uc.channels {
[178]	778	if _, ok := ch.Members[msg.Prefix.Name]; ok {
	779	delete(ch.Members, msg.Prefix.Name)
	780
[187]	781	uc.appendLog(ch.Name, "*** Quits: %s (%s@%s) (%s)", msg.Prefix.Name, msg.Prefix.User, msg.Prefix.Host, reason)
[178]	782	}
[83]	783	}
	784
	785	if msg.Prefix.Name != uc.nick {
	786	uc.forEachDownstream(func(dc *downstreamConn) {
	787	dc.SendMessage(&irc.Message{
	788	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	789	Command: "QUIT",
	790	Params: msg.Params,
	791	})
	792	})
	793	}
[19]	794	case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
[43]	795	var name, topic string
	796	if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
	797	return err
[19]	798	}
[55]	799	ch, err := uc.getChannel(name)
[19]	800	if err != nil {
	801	return err
	802	}
	803	if msg.Command == irc.RPL_TOPIC {
[43]	804	ch.Topic = topic
[19]	805	} else {
	806	ch.Topic = ""
	807	}
	808	case "TOPIC":
[43]	809	var name string
[74]	810	if err := parseMessageParams(msg, &name); err != nil {
[43]	811	return err
[19]	812	}
[55]	813	ch, err := uc.getChannel(name)
[19]	814	if err != nil {
	815	return err
	816	}
	817	if len(msg.Params) > 1 {
	818	ch.Topic = msg.Params[1]
	819	} else {
	820	ch.Topic = ""
	821	}
[74]	822	uc.forEachDownstream(func(dc *downstreamConn) {
	823	params := []string{dc.marshalChannel(uc, name)}
	824	if ch.Topic != "" {
	825	params = append(params, ch.Topic)
	826	}
	827	dc.SendMessage(&irc.Message{
	828	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	829	Command: "TOPIC",
	830	Params: params,
	831	})
	832	})
[139]	833	case "MODE":
	834	var name, modeStr string
	835	if err := parseMessageParams(msg, &name, &modeStr); err != nil {
	836	return err
	837	}
	838
	839	if !uc.isChannel(name) { // user mode change
	840	if name != uc.nick {
	841	return fmt.Errorf("received MODE message for unknown nick %q", name)
	842	}
	843	return uc.modes.Apply(modeStr)
	844	// TODO: notify downstreams about user mode change?
	845	} else { // channel mode change
	846	ch, err := uc.getChannel(name)
	847	if err != nil {
	848	return err
	849	}
	850
	851	if ch.modes != nil {
	852	if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[2:]...); err != nil {
	853	return err
	854	}
	855	}
	856
[178]	857	modeMsg := modeStr
	858	for _, v := range msg.Params[2:] {
	859	modeMsg += " " + v
	860	}
[187]	861	uc.appendLog(ch.Name, "*** %s sets mode: %s", msg.Prefix.Name, modeMsg)
[178]	862
[139]	863	uc.forEachDownstream(func(dc *downstreamConn) {
	864	params := []string{dc.marshalChannel(uc, name), modeStr}
	865	params = append(params, msg.Params[2:]...)
	866
	867	dc.SendMessage(&irc.Message{
	868	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	869	Command: "MODE",
	870	Params: params,
	871	})
	872	})
	873	}
	874	case irc.RPL_UMODEIS:
	875	if err := parseMessageParams(msg, nil); err != nil {
	876	return err
	877	}
	878	modeStr := ""
	879	if len(msg.Params) > 1 {
	880	modeStr = msg.Params[1]
	881	}
	882
	883	uc.modes = ""
	884	if err := uc.modes.Apply(modeStr); err != nil {
	885	return err
	886	}
	887	// TODO: send RPL_UMODEIS to downstream connections when applicable
	888	case irc.RPL_CHANNELMODEIS:
	889	var channel string
	890	if err := parseMessageParams(msg, nil, &channel); err != nil {
	891	return err
	892	}
	893	modeStr := ""
	894	if len(msg.Params) > 2 {
	895	modeStr = msg.Params[2]
	896	}
	897
	898	ch, err := uc.getChannel(channel)
	899	if err != nil {
	900	return err
	901	}
	902
	903	firstMode := ch.modes == nil
	904	ch.modes = make(map[byte]string)
	905	if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[3:]...); err != nil {
	906	return err
	907	}
	908	if firstMode {
	909	modeStr, modeParams := ch.modes.Format()
	910
	911	uc.forEachDownstream(func(dc *downstreamConn) {
	912	params := []string{dc.nick, dc.marshalChannel(uc, channel), modeStr}
	913	params = append(params, modeParams...)
	914
	915	dc.SendMessage(&irc.Message{
	916	Prefix: dc.srv.prefix(),
	917	Command: irc.RPL_CHANNELMODEIS,
	918	Params: params,
	919	})
	920	})
	921	}
[162]	922	case rpl_creationtime:
	923	var channel, creationTime string
	924	if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
	925	return err
	926	}
	927
	928	ch, err := uc.getChannel(channel)
	929	if err != nil {
	930	return err
	931	}
	932
	933	firstCreationTime := ch.creationTime == ""
	934	ch.creationTime = creationTime
	935	if firstCreationTime {
	936	uc.forEachDownstream(func(dc *downstreamConn) {
	937	dc.SendMessage(&irc.Message{
	938	Prefix: dc.srv.prefix(),
	939	Command: rpl_creationtime,
	940	Params: []string{dc.nick, channel, creationTime},
	941	})
	942	})
	943	}
[19]	944	case rpl_topicwhotime:
[43]	945	var name, who, timeStr string
	946	if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
	947	return err
[19]	948	}
[55]	949	ch, err := uc.getChannel(name)
[19]	950	if err != nil {
	951	return err
	952	}
[43]	953	ch.TopicWho = who
	954	sec, err := strconv.ParseInt(timeStr, 10, 64)
[19]	955	if err != nil {
	956	return fmt.Errorf("failed to parse topic time: %v", err)
	957	}
	958	ch.TopicTime = time.Unix(sec, 0)
[177]	959	case irc.RPL_LIST:
	960	var channel, clients, topic string
	961	if err := parseMessageParams(msg, nil, &channel, &clients, &topic); err != nil {
	962	return err
	963	}
	964
[181]	965	pl := uc.getPendingLIST()
[177]	966	if pl == nil {
	967	return fmt.Errorf("unexpected RPL_LIST: no matching pending LIST")
	968	}
	969
	970	uc.forEachDownstreamByID(pl.downstreamID, func(dc *downstreamConn) {
	971	dc.SendMessage(&irc.Message{
	972	Prefix: dc.srv.prefix(),
	973	Command: irc.RPL_LIST,
	974	Params: []string{dc.nick, dc.marshalChannel(uc, channel), clients, topic},
	975	})
	976	})
	977	case irc.RPL_LISTEND:
[181]	978	ok := uc.endPendingLISTs(false)
[177]	979	if !ok {
	980	return fmt.Errorf("unexpected RPL_LISTEND: no matching pending LIST")
	981	}
[19]	982	case irc.RPL_NAMREPLY:
[43]	983	var name, statusStr, members string
	984	if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
	985	return err
[19]	986	}
[140]	987
	988	ch, ok := uc.channels[name]
	989	if !ok {
	990	// NAMES on a channel we have not joined, forward to downstream
[161]	991	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[140]	992	channel := dc.marshalChannel(uc, name)
[174]	993	members := splitSpace(members)
[140]	994	for i, member := range members {
	995	membership, nick := uc.parseMembershipPrefix(member)
	996	members[i] = membership.String() + dc.marshalNick(uc, nick)
	997	}
	998	memberStr := strings.Join(members, " ")
	999
	1000	dc.SendMessage(&irc.Message{
	1001	Prefix: dc.srv.prefix(),
	1002	Command: irc.RPL_NAMREPLY,
	1003	Params: []string{dc.nick, statusStr, channel, memberStr},
	1004	})
	1005	})
	1006	return nil
[19]	1007	}
	1008
[43]	1009	status, err := parseChannelStatus(statusStr)
[19]	1010	if err != nil {
	1011	return err
	1012	}
	1013	ch.Status = status
	1014
[174]	1015	for _, s := range splitSpace(members) {
[139]	1016	membership, nick := uc.parseMembershipPrefix(s)
[19]	1017	ch.Members[nick] = membership
	1018	}
	1019	case irc.RPL_ENDOFNAMES:
[43]	1020	var name string
	1021	if err := parseMessageParams(msg, nil, &name); err != nil {
	1022	return err
[25]	1023	}
[140]	1024
	1025	ch, ok := uc.channels[name]
	1026	if !ok {
	1027	// NAMES on a channel we have not joined, forward to downstream
[161]	1028	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[140]	1029	channel := dc.marshalChannel(uc, name)
	1030
	1031	dc.SendMessage(&irc.Message{
	1032	Prefix: dc.srv.prefix(),
	1033	Command: irc.RPL_ENDOFNAMES,
	1034	Params: []string{dc.nick, channel, "End of /NAMES list"},
	1035	})
	1036	})
	1037	return nil
[25]	1038	}
	1039
[34]	1040	if ch.complete {
	1041	return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
	1042	}
[25]	1043	ch.complete = true
[27]	1044
[73]	1045	uc.forEachDownstream(func(dc *downstreamConn) {
[27]	1046	forwardChannel(dc, ch)
[40]	1047	})
[127]	1048	case irc.RPL_WHOREPLY:
	1049	var channel, username, host, server, nick, mode, trailing string
	1050	if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
	1051	return err
	1052	}
	1053
	1054	parts := strings.SplitN(trailing, " ", 2)
	1055	if len(parts) != 2 {
	1056	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
	1057	}
	1058	realname := parts[1]
	1059	hops, err := strconv.Atoi(parts[0])
	1060	if err != nil {
	1061	return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
	1062	}
	1063	hops++
	1064
	1065	trailing = strconv.Itoa(hops) + " " + realname
	1066
[161]	1067	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1068	channel := channel
	1069	if channel != "*" {
	1070	channel = dc.marshalChannel(uc, channel)
	1071	}
	1072	nick := dc.marshalNick(uc, nick)
	1073	dc.SendMessage(&irc.Message{
	1074	Prefix: dc.srv.prefix(),
	1075	Command: irc.RPL_WHOREPLY,
	1076	Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
	1077	})
	1078	})
	1079	case irc.RPL_ENDOFWHO:
	1080	var name string
	1081	if err := parseMessageParams(msg, nil, &name); err != nil {
	1082	return err
	1083	}
	1084
[161]	1085	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[127]	1086	name := name
	1087	if name != "*" {
	1088	// TODO: support WHO masks
	1089	name = dc.marshalEntity(uc, name)
	1090	}
	1091	dc.SendMessage(&irc.Message{
	1092	Prefix: dc.srv.prefix(),
	1093	Command: irc.RPL_ENDOFWHO,
[142]	1094	Params: []string{dc.nick, name, "End of /WHO list"},
[127]	1095	})
	1096	})
[128]	1097	case irc.RPL_WHOISUSER:
	1098	var nick, username, host, realname string
	1099	if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
	1100	return err
	1101	}
	1102
[161]	1103	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1104	nick := dc.marshalNick(uc, nick)
	1105	dc.SendMessage(&irc.Message{
	1106	Prefix: dc.srv.prefix(),
	1107	Command: irc.RPL_WHOISUSER,
	1108	Params: []string{dc.nick, nick, username, host, "*", realname},
	1109	})
	1110	})
	1111	case irc.RPL_WHOISSERVER:
	1112	var nick, server, serverInfo string
	1113	if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
	1114	return err
	1115	}
	1116
[161]	1117	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1118	nick := dc.marshalNick(uc, nick)
	1119	dc.SendMessage(&irc.Message{
	1120	Prefix: dc.srv.prefix(),
	1121	Command: irc.RPL_WHOISSERVER,
	1122	Params: []string{dc.nick, nick, server, serverInfo},
	1123	})
	1124	})
	1125	case irc.RPL_WHOISOPERATOR:
	1126	var nick string
	1127	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1128	return err
	1129	}
	1130
[161]	1131	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1132	nick := dc.marshalNick(uc, nick)
	1133	dc.SendMessage(&irc.Message{
	1134	Prefix: dc.srv.prefix(),
	1135	Command: irc.RPL_WHOISOPERATOR,
	1136	Params: []string{dc.nick, nick, "is an IRC operator"},
	1137	})
	1138	})
	1139	case irc.RPL_WHOISIDLE:
	1140	var nick string
	1141	if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
	1142	return err
	1143	}
	1144
[161]	1145	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1146	nick := dc.marshalNick(uc, nick)
	1147	params := []string{dc.nick, nick}
	1148	params = append(params, msg.Params[2:]...)
	1149	dc.SendMessage(&irc.Message{
	1150	Prefix: dc.srv.prefix(),
	1151	Command: irc.RPL_WHOISIDLE,
	1152	Params: params,
	1153	})
	1154	})
	1155	case irc.RPL_WHOISCHANNELS:
	1156	var nick, channelList string
	1157	if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
	1158	return err
	1159	}
[174]	1160	channels := splitSpace(channelList)
[128]	1161
[161]	1162	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1163	nick := dc.marshalNick(uc, nick)
	1164	channelList := make([]string, len(channels))
	1165	for i, channel := range channels {
[139]	1166	prefix, channel := uc.parseMembershipPrefix(channel)
[128]	1167	channel = dc.marshalChannel(uc, channel)
	1168	channelList[i] = prefix.String() + channel
	1169	}
	1170	channels := strings.Join(channelList, " ")
	1171	dc.SendMessage(&irc.Message{
	1172	Prefix: dc.srv.prefix(),
	1173	Command: irc.RPL_WHOISCHANNELS,
	1174	Params: []string{dc.nick, nick, channels},
	1175	})
	1176	})
	1177	case irc.RPL_ENDOFWHOIS:
	1178	var nick string
	1179	if err := parseMessageParams(msg, nil, &nick); err != nil {
	1180	return err
	1181	}
	1182
[161]	1183	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
[128]	1184	nick := dc.marshalNick(uc, nick)
	1185	dc.SendMessage(&irc.Message{
	1186	Prefix: dc.srv.prefix(),
	1187	Command: irc.RPL_ENDOFWHOIS,
[142]	1188	Params: []string{dc.nick, nick, "End of /WHOIS list"},
[128]	1189	})
	1190	})
[36]	1191	case "PRIVMSG":
[117]	1192	if msg.Prefix == nil {
	1193	return fmt.Errorf("expected a prefix")
	1194	}
	1195
[178]	1196	var nick, text string
	1197	if err := parseMessageParams(msg, &nick, &text); err != nil {
[69]	1198	return err
	1199	}
[117]	1200
	1201	if msg.Prefix.Name == serviceNick {
	1202	uc.logger.Printf("skipping PRIVMSG from soju's service: %v", msg)
	1203	break
	1204	}
	1205	if nick == serviceNick {
	1206	uc.logger.Printf("skipping PRIVMSG to soju's service: %v", msg)
	1207	break
	1208	}
	1209
[193]	1210	if _, ok := msg.Tags["time"]; !ok {
	1211	msg.Tags["time"] = irc.TagValue(time.Now().Format(serverTimeLayout))
	1212	}
	1213
[178]	1214	target := nick
	1215	if nick == uc.nick {
	1216	target = msg.Prefix.Name
	1217	}
[187]	1218	uc.appendLog(target, "<%s> %s", msg.Prefix.Name, text)
[178]	1219
[143]	1220	uc.network.ring.Produce(msg)
[115]	1221	case "INVITE":
	1222	var nick string
	1223	var channel string
	1224	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1225	return err
	1226	}
	1227
	1228	uc.forEachDownstream(func(dc *downstreamConn) {
	1229	dc.SendMessage(&irc.Message{
	1230	Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
	1231	Command: "INVITE",
	1232	Params: []string{dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
	1233	})
	1234	})
[163]	1235	case irc.RPL_INVITING:
	1236	var nick string
	1237	var channel string
	1238	if err := parseMessageParams(msg, &nick, &channel); err != nil {
	1239	return err
	1240	}
	1241
	1242	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1243	dc.SendMessage(&irc.Message{
	1244	Prefix: dc.srv.prefix(),
	1245	Command: irc.RPL_INVITING,
	1246	Params: []string{dc.nick, dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
	1247	})
	1248	})
[177]	1249	case irc.ERR_UNKNOWNCOMMAND, irc.RPL_TRYAGAIN:
	1250	var command, reason string
	1251	if err := parseMessageParams(msg, nil, &command, &reason); err != nil {
	1252	return err
	1253	}
	1254
	1255	if command == "LIST" {
[181]	1256	ok := uc.endPendingLISTs(false)
[177]	1257	if !ok {
	1258	return fmt.Errorf("unexpected response for LIST: %q: no matching pending LIST", msg.Command)
	1259	}
	1260	uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
	1261	dc.SendMessage(&irc.Message{
	1262	Prefix: uc.srv.prefix(),
	1263	Command: msg.Command,
	1264	Params: []string{dc.nick, "LIST", reason},
	1265	})
	1266	})
	1267	}
[152]	1268	case "TAGMSG":
	1269	// TODO: relay to downstream connections that accept message-tags
[155]	1270	case "ACK":
	1271	// Ignore
[16]	1272	case irc.RPL_YOURHOST, irc.RPL_CREATED:
[14]	1273	// Ignore
	1274	case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
	1275	// Ignore
	1276	case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
	1277	// Ignore
[177]	1278	case irc.RPL_LISTSTART:
	1279	// Ignore
[14]	1280	case rpl_localusers, rpl_globalusers:
	1281	// Ignore
[96]	1282	case irc.RPL_STATSVLINE, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
[14]	1283	// Ignore
[13]	1284	default:
[95]	1285	uc.logger.Printf("unhandled message: %v", msg)
[13]	1286	}
[14]	1287	return nil
[13]	1288	}
	1289
[174]	1290	func splitSpace(s string) []string {
	1291	return strings.FieldsFunc(s, func(r rune) bool {
	1292	return r == ' '
	1293	})
	1294	}
	1295
[55]	1296	func (uc *upstreamConn) register() {
[77]	1297	uc.nick = uc.network.Nick
	1298	uc.username = uc.network.Username
	1299	if uc.username == "" {
	1300	uc.username = uc.nick
	1301	}
	1302	uc.realname = uc.network.Realname
	1303	if uc.realname == "" {
	1304	uc.realname = uc.nick
	1305	}
	1306
[60]	1307	uc.SendMessage(&irc.Message{
[92]	1308	Command: "CAP",
	1309	Params: []string{"LS", "302"},
	1310	})
	1311
[93]	1312	if uc.network.Pass != "" {
	1313	uc.SendMessage(&irc.Message{
	1314	Command: "PASS",
	1315	Params: []string{uc.network.Pass},
	1316	})
	1317	}
	1318
[92]	1319	uc.SendMessage(&irc.Message{
[13]	1320	Command: "NICK",
[69]	1321	Params: []string{uc.nick},
[60]	1322	})
	1323	uc.SendMessage(&irc.Message{
[13]	1324	Command: "USER",
[77]	1325	Params: []string{uc.username, "0", "*", uc.realname},
[60]	1326	})
[44]	1327	}
[13]	1328
[95]	1329	func (uc *upstreamConn) requestSASL() bool {
	1330	if uc.network.SASL.Mechanism == "" {
	1331	return false
	1332	}
	1333
	1334	v, ok := uc.caps["sasl"]
	1335	if !ok {
	1336	return false
	1337	}
	1338	if v != "" {
	1339	mechanisms := strings.Split(v, ",")
	1340	found := false
	1341	for _, mech := range mechanisms {
	1342	if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
	1343	found = true
	1344	break
	1345	}
	1346	}
	1347	if !found {
	1348	return false
	1349	}
	1350	}
	1351
	1352	return true
	1353	}
	1354
	1355	func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
	1356	auth := &uc.network.SASL
	1357	switch name {
	1358	case "sasl":
	1359	if !ok {
	1360	uc.logger.Printf("server refused to acknowledge the SASL capability")
	1361	return nil
	1362	}
	1363
	1364	switch auth.Mechanism {
	1365	case "PLAIN":
	1366	uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
	1367	uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
	1368	default:
	1369	return fmt.Errorf("unsupported SASL mechanism %q", name)
	1370	}
	1371
	1372	uc.SendMessage(&irc.Message{
	1373	Command: "AUTHENTICATE",
	1374	Params: []string{auth.Mechanism},
	1375	})
[152]	1376	case "message-tags":
	1377	uc.tagsSupported = ok
[155]	1378	case "labeled-response":
	1379	uc.labelsSupported = ok
[193]	1380	case "batch", "server-time":
	1381	// Nothing to do
	1382	default:
	1383	uc.logger.Printf("received CAP ACK/NAK for a cap we don't support: %v", name)
[95]	1384	}
	1385	return nil
	1386	}
	1387
[165]	1388	func (uc *upstreamConn) readMessages(ch chan<- event) error {
[13]	1389	for {
[55]	1390	msg, err := uc.irc.ReadMessage()
[13]	1391	if err == io.EOF {
	1392	break
	1393	} else if err != nil {
	1394	return fmt.Errorf("failed to read IRC command: %v", err)
	1395	}
	1396
[64]	1397	if uc.srv.Debug {
	1398	uc.logger.Printf("received: %v", msg)
	1399	}
	1400
[165]	1401	ch <- eventUpstreamMessage{msg, uc}
[13]	1402	}
	1403
[45]	1404	return nil
[13]	1405	}
[60]	1406
[180]	1407	// SendMessage queues a new outgoing message. It is safe to call from any
	1408	// goroutine.
[60]	1409	func (uc upstreamConn) SendMessage(msg irc.Message) {
[102]	1410	uc.outgoing <- msg
[60]	1411	}
[155]	1412
[176]	1413	func (uc upstreamConn) SendMessageLabeled(downstreamID uint64, msg irc.Message) {
[155]	1414	if uc.labelsSupported {
	1415	if msg.Tags == nil {
	1416	msg.Tags = make(map[string]irc.TagValue)
	1417	}
[176]	1418	msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", downstreamID, uc.nextLabelID))
[161]	1419	uc.nextLabelID++
[155]	1420	}
	1421	uc.SendMessage(msg)
	1422	}
[178]	1423
	1424	// TODO: handle moving logs when a network name changes, when support for this is added
[187]	1425	func (uc *upstreamConn) appendLog(entity string, format string, a ...interface{}) {
[178]	1426	if uc.srv.LogPath == "" {
	1427	return
	1428	}
	1429	// TODO: enforce maximum open file handles (LRU cache of file handles)
	1430	// TODO: handle non-monotonic clock behaviour
	1431	now := time.Now()
	1432	year, month, day := now.Date()
	1433	name := fmt.Sprintf("%04d-%02d-%02d.log", year, month, day)
	1434	log, ok := uc.logs[entity]
	1435	if !ok \|\| log.name != name {
	1436	if ok {
	1437	log.file.Close()
	1438	delete(uc.logs, entity)
	1439	}
	1440	// TODO: handle/forbid network/entity names with illegal path characters
	1441	dir := filepath.Join(uc.srv.LogPath, uc.user.Username, uc.network.Name, entity)
[195]	1442	if err := os.MkdirAll(dir, 0700); err != nil {
[178]	1443	uc.logger.Printf("failed to log message: could not create logs directory %q: %v", dir, err)
	1444	return
	1445	}
	1446	path := filepath.Join(dir, name)
	1447	f, err := os.OpenFile(path, os.O_RDWR\|os.O_CREATE\|os.O_APPEND, 0600)
	1448	if err != nil {
	1449	uc.logger.Printf("failed to log message: could not open or create log file %q: %v", path, err)
	1450	return
	1451	}
	1452	log = entityLog{
	1453	name: name,
	1454	file: f,
	1455	}
	1456	uc.logs[entity] = log
	1457	}
	1458
	1459	format = "[%02d:%02d:%02d] " + format + "\n"
	1460	args := []interface{}{now.Hour(), now.Minute(), now.Second()}
	1461	args = append(args, a...)
	1462
	1463	if _, err := fmt.Fprintf(log.file, format, args...); err != nil {
	1464	uc.logger.Printf("failed to log message to %q: %v", log.name, err)
	1465	}
	1466	}

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