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source: code/trunk/downstream.go@ 390

Last change on this file since 390 was 387, checked in by contact, 5 years ago

Extract history loading into functions

These will get re-used for sending history to clients that don't support
the chathistory extension.

File size: 40.7 KB

Rev	Line
[98]	1	package soju
[13]	2
	3	import (
[91]	4	"crypto/tls"
[112]	5	"encoding/base64"
[13]	6	"fmt"
	7	"io"
	8	"net"
[108]	9	"strconv"
[39]	10	"strings"
[91]	11	"time"
[13]	12
[112]	13	"github.com/emersion/go-sasl"
[85]	14	"golang.org/x/crypto/bcrypt"
[13]	15	"gopkg.in/irc.v3"
	16	)
	17
	18	type ircError struct {
	19	Message *irc.Message
	20	}
	21
[85]	22	func (err ircError) Error() string {
	23	return err.Message.String()
	24	}
	25
[13]	26	func newUnknownCommandError(cmd string) ircError {
	27	return ircError{&irc.Message{
	28	Command: irc.ERR_UNKNOWNCOMMAND,
	29	Params: []string{
	30	"*",
	31	cmd,
	32	"Unknown command",
	33	},
	34	}}
	35	}
	36
	37	func newNeedMoreParamsError(cmd string) ircError {
	38	return ircError{&irc.Message{
	39	Command: irc.ERR_NEEDMOREPARAMS,
	40	Params: []string{
	41	"*",
	42	cmd,
	43	"Not enough parameters",
	44	},
	45	}}
	46	}
	47
[319]	48	func newChatHistoryError(subcommand string, target string) ircError {
	49	return ircError{&irc.Message{
	50	Command: "FAIL",
	51	Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, target, "Messages could not be retrieved"},
	52	}}
	53	}
	54
[85]	55	var errAuthFailed = ircError{&irc.Message{
	56	Command: irc.ERR_PASSWDMISMATCH,
	57	Params: []string{"*", "Invalid username or password"},
	58	}}
[13]	59
[275]	60	// permanentDownstreamCaps is the list of always-supported downstream
	61	// capabilities.
	62	var permanentDownstreamCaps = map[string]string{
[276]	63	"batch": "",
	64	"cap-notify": "",
[275]	65	"echo-message": "",
	66	"message-tags": "",
[276]	67	"sasl": "PLAIN",
	68	"server-time": "",
[275]	69	}
	70
[292]	71	// needAllDownstreamCaps is the list of downstream capabilities that
	72	// require support from all upstreams to be enabled
	73	var needAllDownstreamCaps = map[string]string{
	74	"away-notify": "",
	75	"multi-prefix": "",
	76	}
	77
[13]	78	type downstreamConn struct {
[210]	79	conn
[22]	80
[210]	81	id uint64
	82
[100]	83	registered bool
	84	user *user
	85	nick string
	86	rawUsername string
[168]	87	networkName string
[183]	88	clientName string
[100]	89	realname string
[141]	90	hostname string
[100]	91	password string // empty after authentication
	92	network *network // can be nil
[105]	93
[108]	94	negociatingCaps bool
	95	capVersion int
[275]	96	supportedCaps map[string]string
[236]	97	caps map[string]bool
[108]	98
[112]	99	saslServer sasl.Server
[13]	100	}
	101
[347]	102	func newDownstreamConn(srv Server, ic ircConn, id uint64) downstreamConn {
	103	remoteAddr := ic.RemoteAddr().String()
[323]	104	logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
[55]	105	dc := &downstreamConn{
[323]	106	conn: *newConn(srv, ic, logger),
[276]	107	id: id,
[275]	108	supportedCaps: make(map[string]string),
[276]	109	caps: make(map[string]bool),
[22]	110	}
[323]	111	dc.hostname = remoteAddr
[141]	112	if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
	113	dc.hostname = host
	114	}
[275]	115	for k, v := range permanentDownstreamCaps {
	116	dc.supportedCaps[k] = v
	117	}
[319]	118	if srv.LogPath != "" {
	119	dc.supportedCaps["draft/chathistory"] = ""
	120	}
[55]	121	return dc
[22]	122	}
	123
[55]	124	func (dc downstreamConn) prefix() irc.Prefix {
[27]	125	return &irc.Prefix{
[55]	126	Name: dc.nick,
[184]	127	User: dc.user.Username,
[141]	128	Host: dc.hostname,
[27]	129	}
	130	}
	131
[90]	132	func (dc downstreamConn) forEachNetwork(f func(network)) {
	133	if dc.network != nil {
	134	f(dc.network)
	135	} else {
	136	dc.user.forEachNetwork(f)
	137	}
	138	}
	139
[73]	140	func (dc downstreamConn) forEachUpstream(f func(upstreamConn)) {
	141	dc.user.forEachUpstream(func(uc *upstreamConn) {
[77]	142	if dc.network != nil && uc.network != dc.network {
[73]	143	return
	144	}
	145	f(uc)
	146	})
	147	}
	148
[89]	149	// upstream returns the upstream connection, if any. If there are zero or if
	150	// there are multiple upstream connections, it returns nil.
	151	func (dc downstreamConn) upstream() upstreamConn {
	152	if dc.network == nil {
	153	return nil
	154	}
[279]	155	return dc.network.conn
[89]	156	}
	157
[260]	158	func isOurNick(net *network, nick string) bool {
	159	// TODO: this doesn't account for nick changes
	160	if net.conn != nil {
	161	return nick == net.conn.nick
	162	}
	163	// We're not currently connected to the upstream connection, so we don't
	164	// know whether this name is our nickname. Best-effort: use the network's
	165	// configured nickname and hope it was the one being used when we were
	166	// connected.
	167	return nick == net.Nick
	168	}
	169
[249]	170	// marshalEntity converts an upstream entity name (ie. channel or nick) into a
	171	// downstream entity name.
	172	//
	173	// This involves adding a "/<network>" suffix if the entity isn't the current
	174	// user.
[260]	175	func (dc downstreamConn) marshalEntity(net network, name string) string {
[289]	176	if isOurNick(net, name) {
	177	return dc.nick
	178	}
[257]	179	if dc.network != nil {
[260]	180	if dc.network != net {
[258]	181	panic("soju: tried to marshal an entity for another network")
	182	}
[257]	183	return name
[119]	184	}
[260]	185	return name + "/" + net.GetName()
[119]	186	}
	187
[260]	188	func (dc downstreamConn) marshalUserPrefix(net network, prefix irc.Prefix) irc.Prefix {
	189	if isOurNick(net, prefix.Name) {
[257]	190	return dc.prefix()
	191	}
[130]	192	if dc.network != nil {
[260]	193	if dc.network != net {
[258]	194	panic("soju: tried to marshal a user prefix for another network")
	195	}
[257]	196	return prefix
[119]	197	}
[257]	198	return &irc.Prefix{
[260]	199	Name: prefix.Name + "/" + net.GetName(),
[257]	200	User: prefix.User,
	201	Host: prefix.Host,
	202	}
[119]	203	}
	204
[249]	205	// unmarshalEntity converts a downstream entity name (ie. channel or nick) into
	206	// an upstream entity name.
	207	//
	208	// This involves removing the "/<network>" suffix.
[127]	209	func (dc downstreamConn) unmarshalEntity(name string) (upstreamConn, string, error) {
[89]	210	if uc := dc.upstream(); uc != nil {
	211	return uc, name, nil
	212	}
	213
[127]	214	var conn *upstreamConn
[119]	215	if i := strings.LastIndexByte(name, '/'); i >= 0 {
[127]	216	network := name[i+1:]
[119]	217	name = name[:i]
	218
	219	dc.forEachUpstream(func(uc *upstreamConn) {
	220	if network != uc.network.GetName() {
	221	return
	222	}
	223	conn = uc
	224	})
	225	}
	226
[127]	227	if conn == nil {
[73]	228	return nil, "", ircError{&irc.Message{
	229	Command: irc.ERR_NOSUCHCHANNEL,
	230	Params: []string{name, "No such channel"},
	231	}}
[69]	232	}
[127]	233	return conn, name, nil
[69]	234	}
	235
[268]	236	func (dc downstreamConn) unmarshalText(uc upstreamConn, text string) string {
	237	if dc.upstream() != nil {
	238	return text
	239	}
	240	// TODO: smarter parsing that ignores URLs
	241	return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
	242	}
	243
[165]	244	func (dc *downstreamConn) readMessages(ch chan<- event) error {
[22]	245	for {
[210]	246	msg, err := dc.ReadMessage()
[22]	247	if err == io.EOF {
	248	break
	249	} else if err != nil {
	250	return fmt.Errorf("failed to read IRC command: %v", err)
	251	}
	252
[165]	253	ch <- eventDownstreamMessage{msg, dc}
[22]	254	}
	255
[45]	256	return nil
[22]	257	}
	258
[230]	259	// SendMessage sends an outgoing message.
	260	//
	261	// This can only called from the user goroutine.
[55]	262	func (dc downstreamConn) SendMessage(msg irc.Message) {
[230]	263	if !dc.caps["message-tags"] {
[303]	264	if msg.Command == "TAGMSG" {
	265	return
	266	}
[216]	267	msg = msg.Copy()
	268	for name := range msg.Tags {
	269	supported := false
	270	switch name {
	271	case "time":
[230]	272	supported = dc.caps["server-time"]
[216]	273	}
	274	if !supported {
	275	delete(msg.Tags, name)
	276	}
	277	}
	278	}
	279
[210]	280	dc.conn.SendMessage(msg)
[54]	281	}
	282
[245]	283	// marshalMessage re-formats a message coming from an upstream connection so
	284	// that it's suitable for being sent on this downstream connection. Only
[293]	285	// messages that may appear in logs are supported, except MODE.
[261]	286	func (dc downstreamConn) marshalMessage(msg irc.Message, net network) irc.Message {
[227]	287	msg = msg.Copy()
[261]	288	msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
[245]	289
[227]	290	switch msg.Command {
[303]	291	case "PRIVMSG", "NOTICE", "TAGMSG":
[261]	292	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[245]	293	case "NICK":
	294	// Nick change for another user
[261]	295	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[245]	296	case "JOIN", "PART":
[261]	297	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[245]	298	case "KICK":
[261]	299	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
	300	msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
[245]	301	case "TOPIC":
[261]	302	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[245]	303	case "QUIT":
[262]	304	// This space is intentionally left blank
[227]	305	default:
	306	panic(fmt.Sprintf("unexpected %q message", msg.Command))
	307	}
	308
[245]	309	return msg
[227]	310	}
	311
[55]	312	func (dc downstreamConn) handleMessage(msg irc.Message) error {
[13]	313	switch msg.Command {
[28]	314	case "QUIT":
[55]	315	return dc.Close()
[13]	316	default:
[55]	317	if dc.registered {
	318	return dc.handleMessageRegistered(msg)
[13]	319	} else {
[55]	320	return dc.handleMessageUnregistered(msg)
[13]	321	}
	322	}
	323	}
	324
[55]	325	func (dc downstreamConn) handleMessageUnregistered(msg irc.Message) error {
[13]	326	switch msg.Command {
	327	case "NICK":
[117]	328	var nick string
	329	if err := parseMessageParams(msg, &nick); err != nil {
[43]	330	return err
[13]	331	}
[117]	332	if nick == serviceNick {
	333	return ircError{&irc.Message{
	334	Command: irc.ERR_NICKNAMEINUSE,
	335	Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
	336	}}
	337	}
	338	dc.nick = nick
[13]	339	case "USER":
[117]	340	if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
[43]	341	return err
[13]	342	}
[85]	343	case "PASS":
	344	if err := parseMessageParams(msg, &dc.password); err != nil {
	345	return err
	346	}
[108]	347	case "CAP":
	348	var subCmd string
	349	if err := parseMessageParams(msg, &subCmd); err != nil {
	350	return err
	351	}
	352	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	353	return err
	354	}
[112]	355	case "AUTHENTICATE":
[230]	356	if !dc.caps["sasl"] {
[112]	357	return ircError{&irc.Message{
[125]	358	Command: irc.ERR_SASLFAIL,
[112]	359	Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
	360	}}
	361	}
	362	if len(msg.Params) == 0 {
	363	return ircError{&irc.Message{
[125]	364	Command: irc.ERR_SASLFAIL,
[112]	365	Params: []string{"*", "Missing AUTHENTICATE argument"},
	366	}}
	367	}
	368	if dc.nick == "" {
	369	return ircError{&irc.Message{
[125]	370	Command: irc.ERR_SASLFAIL,
[112]	371	Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
	372	}}
	373	}
	374
	375	var resp []byte
	376	if dc.saslServer == nil {
	377	mech := strings.ToUpper(msg.Params[0])
	378	switch mech {
	379	case "PLAIN":
	380	dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
	381	return dc.authenticate(username, password)
	382	}))
	383	default:
	384	return ircError{&irc.Message{
[125]	385	Command: irc.ERR_SASLFAIL,
[112]	386	Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
	387	}}
	388	}
	389	} else if msg.Params[0] == "*" {
	390	dc.saslServer = nil
	391	return ircError{&irc.Message{
[125]	392	Command: irc.ERR_SASLABORTED,
[112]	393	Params: []string{"*", "SASL authentication aborted"},
	394	}}
	395	} else if msg.Params[0] == "+" {
	396	resp = nil
	397	} else {
	398	// TODO: multi-line messages
	399	var err error
	400	resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
	401	if err != nil {
	402	dc.saslServer = nil
	403	return ircError{&irc.Message{
[125]	404	Command: irc.ERR_SASLFAIL,
[112]	405	Params: []string{"*", "Invalid base64-encoded response"},
	406	}}
	407	}
	408	}
	409
	410	challenge, done, err := dc.saslServer.Next(resp)
	411	if err != nil {
	412	dc.saslServer = nil
	413	if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
	414	return ircError{&irc.Message{
[125]	415	Command: irc.ERR_SASLFAIL,
[112]	416	Params: []string{"*", ircErr.Message.Params[1]},
	417	}}
	418	}
	419	dc.SendMessage(&irc.Message{
	420	Prefix: dc.srv.prefix(),
[125]	421	Command: irc.ERR_SASLFAIL,
[112]	422	Params: []string{"*", "SASL error"},
	423	})
	424	return fmt.Errorf("SASL authentication failed: %v", err)
	425	} else if done {
	426	dc.saslServer = nil
	427	dc.SendMessage(&irc.Message{
	428	Prefix: dc.srv.prefix(),
[125]	429	Command: irc.RPL_LOGGEDIN,
[306]	430	Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
[112]	431	})
	432	dc.SendMessage(&irc.Message{
	433	Prefix: dc.srv.prefix(),
[125]	434	Command: irc.RPL_SASLSUCCESS,
[112]	435	Params: []string{dc.nick, "SASL authentication successful"},
	436	})
	437	} else {
	438	challengeStr := "+"
[135]	439	if len(challenge) > 0 {
[112]	440	challengeStr = base64.StdEncoding.EncodeToString(challenge)
	441	}
	442
	443	// TODO: multi-line messages
	444	dc.SendMessage(&irc.Message{
	445	Prefix: dc.srv.prefix(),
	446	Command: "AUTHENTICATE",
	447	Params: []string{challengeStr},
	448	})
	449	}
[13]	450	default:
[55]	451	dc.logger.Printf("unhandled message: %v", msg)
[13]	452	return newUnknownCommandError(msg.Command)
	453	}
[108]	454	if dc.rawUsername != "" && dc.nick != "" && !dc.negociatingCaps {
[55]	455	return dc.register()
[13]	456	}
	457	return nil
	458	}
	459
[108]	460	func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
[111]	461	cmd = strings.ToUpper(cmd)
	462
[108]	463	replyTo := dc.nick
	464	if !dc.registered {
	465	replyTo = "*"
	466	}
	467
	468	switch cmd {
	469	case "LS":
	470	if len(args) > 0 {
	471	var err error
	472	if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
	473	return err
	474	}
	475	}
	476
[275]	477	caps := make([]string, 0, len(dc.supportedCaps))
	478	for k, v := range dc.supportedCaps {
	479	if dc.capVersion >= 302 && v != "" {
[276]	480	caps = append(caps, k+"="+v)
[275]	481	} else {
	482	caps = append(caps, k)
	483	}
[112]	484	}
[108]	485
	486	// TODO: multi-line replies
	487	dc.SendMessage(&irc.Message{
	488	Prefix: dc.srv.prefix(),
	489	Command: "CAP",
	490	Params: []string{replyTo, "LS", strings.Join(caps, " ")},
	491	})
	492
[275]	493	if dc.capVersion >= 302 {
	494	// CAP version 302 implicitly enables cap-notify
	495	dc.caps["cap-notify"] = true
	496	}
	497
[108]	498	if !dc.registered {
	499	dc.negociatingCaps = true
	500	}
	501	case "LIST":
	502	var caps []string
	503	for name := range dc.caps {
	504	caps = append(caps, name)
	505	}
	506
	507	// TODO: multi-line replies
	508	dc.SendMessage(&irc.Message{
	509	Prefix: dc.srv.prefix(),
	510	Command: "CAP",
	511	Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
	512	})
	513	case "REQ":
	514	if len(args) == 0 {
	515	return ircError{&irc.Message{
	516	Command: err_invalidcapcmd,
	517	Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
	518	}}
	519	}
	520
[275]	521	// TODO: atomically ack/nak the whole capability set
[108]	522	caps := strings.Fields(args[0])
	523	ack := true
	524	for _, name := range caps {
	525	name = strings.ToLower(name)
	526	enable := !strings.HasPrefix(name, "-")
	527	if !enable {
	528	name = strings.TrimPrefix(name, "-")
	529	}
	530
[275]	531	if enable == dc.caps[name] {
[108]	532	continue
	533	}
	534
[275]	535	_, ok := dc.supportedCaps[name]
	536	if !ok {
[108]	537	ack = false
[275]	538	break
[108]	539	}
[275]	540
	541	if name == "cap-notify" && dc.capVersion >= 302 && !enable {
	542	// cap-notify cannot be disabled with CAP version 302
	543	ack = false
	544	break
	545	}
	546
	547	dc.caps[name] = enable
[108]	548	}
	549
	550	reply := "NAK"
	551	if ack {
	552	reply = "ACK"
	553	}
	554	dc.SendMessage(&irc.Message{
	555	Prefix: dc.srv.prefix(),
	556	Command: "CAP",
	557	Params: []string{replyTo, reply, args[0]},
	558	})
	559	case "END":
	560	dc.negociatingCaps = false
	561	default:
	562	return ircError{&irc.Message{
	563	Command: err_invalidcapcmd,
	564	Params: []string{replyTo, cmd, "Unknown CAP command"},
	565	}}
	566	}
	567	return nil
	568	}
	569
[275]	570	func (dc *downstreamConn) setSupportedCap(name, value string) {
	571	prevValue, hasPrev := dc.supportedCaps[name]
	572	changed := !hasPrev \|\| prevValue != value
	573	dc.supportedCaps[name] = value
	574
	575	if !dc.caps["cap-notify"] \|\| !changed {
	576	return
	577	}
	578
	579	replyTo := dc.nick
	580	if !dc.registered {
	581	replyTo = "*"
	582	}
	583
	584	cap := name
	585	if value != "" && dc.capVersion >= 302 {
	586	cap = name + "=" + value
	587	}
	588
	589	dc.SendMessage(&irc.Message{
	590	Prefix: dc.srv.prefix(),
	591	Command: "CAP",
	592	Params: []string{replyTo, "NEW", cap},
	593	})
	594	}
	595
	596	func (dc *downstreamConn) unsetSupportedCap(name string) {
	597	_, hasPrev := dc.supportedCaps[name]
	598	delete(dc.supportedCaps, name)
	599	delete(dc.caps, name)
	600
	601	if !dc.caps["cap-notify"] \|\| !hasPrev {
	602	return
	603	}
	604
	605	replyTo := dc.nick
	606	if !dc.registered {
	607	replyTo = "*"
	608	}
	609
	610	dc.SendMessage(&irc.Message{
	611	Prefix: dc.srv.prefix(),
	612	Command: "CAP",
	613	Params: []string{replyTo, "DEL", name},
	614	})
	615	}
	616
[276]	617	func (dc *downstreamConn) updateSupportedCaps() {
[292]	618	supportedCaps := make(map[string]bool)
	619	for cap := range needAllDownstreamCaps {
	620	supportedCaps[cap] = true
	621	}
[276]	622	dc.forEachUpstream(func(uc *upstreamConn) {
[292]	623	for cap, supported := range supportedCaps {
	624	supportedCaps[cap] = supported && uc.caps[cap]
	625	}
[276]	626	})
	627
[292]	628	for cap, supported := range supportedCaps {
	629	if supported {
	630	dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
	631	} else {
	632	dc.unsetSupportedCap(cap)
	633	}
[276]	634	}
	635	}
	636
[296]	637	func (dc *downstreamConn) updateNick() {
	638	if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
	639	dc.SendMessage(&irc.Message{
	640	Prefix: dc.prefix(),
	641	Command: "NICK",
	642	Params: []string{uc.nick},
	643	})
	644	dc.nick = uc.nick
	645	}
	646	}
	647
[91]	648	func sanityCheckServer(addr string) error {
	649	dialer := net.Dialer{Timeout: 30 * time.Second}
	650	conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
	651	if err != nil {
	652	return err
	653	}
	654	return conn.Close()
	655	}
	656
[183]	657	func unmarshalUsername(rawUsername string) (username, client, network string) {
[112]	658	username = rawUsername
[183]	659
	660	i := strings.IndexAny(username, "/@")
	661	j := strings.LastIndexAny(username, "/@")
	662	if i >= 0 {
	663	username = rawUsername[:i]
[73]	664	}
[183]	665	if j >= 0 {
[190]	666	if rawUsername[j] == '@' {
	667	client = rawUsername[j+1:]
	668	} else {
	669	network = rawUsername[j+1:]
	670	}
[73]	671	}
[183]	672	if i >= 0 && j >= 0 && i < j {
[190]	673	if rawUsername[i] == '@' {
	674	client = rawUsername[i+1 : j]
	675	} else {
	676	network = rawUsername[i+1 : j]
	677	}
[183]	678	}
	679
	680	return username, client, network
[112]	681	}
[73]	682
[168]	683	func (dc *downstreamConn) authenticate(username, password string) error {
[183]	684	username, clientName, networkName := unmarshalUsername(username)
[168]	685
[173]	686	u, err := dc.srv.db.GetUser(username)
	687	if err != nil {
	688	dc.logger.Printf("failed authentication for %q: %v", username, err)
[168]	689	return errAuthFailed
	690	}
	691
[322]	692	// Password auth disabled
	693	if u.Password == "" {
	694	return errAuthFailed
	695	}
	696
[173]	697	err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
[168]	698	if err != nil {
	699	dc.logger.Printf("failed authentication for %q: %v", username, err)
	700	return errAuthFailed
	701	}
	702
[173]	703	dc.user = dc.srv.getUser(username)
	704	if dc.user == nil {
	705	dc.logger.Printf("failed authentication for %q: user not active", username)
	706	return errAuthFailed
	707	}
[183]	708	dc.clientName = clientName
[168]	709	dc.networkName = networkName
	710	return nil
	711	}
	712
	713	func (dc *downstreamConn) register() error {
	714	if dc.registered {
	715	return fmt.Errorf("tried to register twice")
	716	}
	717
	718	password := dc.password
	719	dc.password = ""
	720	if dc.user == nil {
	721	if err := dc.authenticate(dc.rawUsername, password); err != nil {
	722	return err
	723	}
	724	}
	725
[183]	726	if dc.clientName == "" && dc.networkName == "" {
	727	_, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
[168]	728	}
	729
	730	dc.registered = true
[184]	731	dc.logger.Printf("registration complete for user %q", dc.user.Username)
[168]	732	return nil
	733	}
	734
	735	func (dc *downstreamConn) loadNetwork() error {
	736	if dc.networkName == "" {
[112]	737	return nil
	738	}
[85]	739
[168]	740	network := dc.user.getNetwork(dc.networkName)
[112]	741	if network == nil {
[168]	742	addr := dc.networkName
[112]	743	if !strings.ContainsRune(addr, ':') {
	744	addr = addr + ":6697"
	745	}
	746
	747	dc.logger.Printf("trying to connect to new network %q", addr)
	748	if err := sanityCheckServer(addr); err != nil {
	749	dc.logger.Printf("failed to connect to %q: %v", addr, err)
	750	return ircError{&irc.Message{
	751	Command: irc.ERR_PASSWDMISMATCH,
[168]	752	Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
[112]	753	}}
	754	}
	755
[354]	756	// Some clients only allow specifying the nickname (and use the
	757	// nickname as a username too). Strip the network name from the
	758	// nickname when auto-saving networks.
	759	nick, _, _ := unmarshalUsername(dc.nick)
	760
[168]	761	dc.logger.Printf("auto-saving network %q", dc.networkName)
[112]	762	var err error
[120]	763	network, err = dc.user.createNetwork(&Network{
[168]	764	Addr: dc.networkName,
[354]	765	Nick: nick,
[120]	766	})
[112]	767	if err != nil {
	768	return err
	769	}
	770	}
	771
	772	dc.network = network
	773	return nil
	774	}
	775
[168]	776	func (dc *downstreamConn) welcome() error {
	777	if dc.user == nil \|\| !dc.registered {
	778	panic("tried to welcome an unregistered connection")
[37]	779	}
	780
[168]	781	// TODO: doing this might take some time. We should do it in dc.register
	782	// instead, but we'll potentially be adding a new network and this must be
	783	// done in the user goroutine.
	784	if err := dc.loadNetwork(); err != nil {
	785	return err
[85]	786	}
	787
[55]	788	dc.SendMessage(&irc.Message{
	789	Prefix: dc.srv.prefix(),
[13]	790	Command: irc.RPL_WELCOME,
[98]	791	Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
[54]	792	})
[55]	793	dc.SendMessage(&irc.Message{
	794	Prefix: dc.srv.prefix(),
[13]	795	Command: irc.RPL_YOURHOST,
[55]	796	Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
[54]	797	})
[55]	798	dc.SendMessage(&irc.Message{
	799	Prefix: dc.srv.prefix(),
[13]	800	Command: irc.RPL_CREATED,
[55]	801	Params: []string{dc.nick, "Who cares when the server was created?"},
[54]	802	})
[55]	803	dc.SendMessage(&irc.Message{
	804	Prefix: dc.srv.prefix(),
[13]	805	Command: irc.RPL_MYINFO,
[98]	806	Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
[54]	807	})
[93]	808	// TODO: RPL_ISUPPORT
[319]	809	// TODO: send CHATHISTORY in RPL_ISUPPORT when implemented
[55]	810	dc.SendMessage(&irc.Message{
	811	Prefix: dc.srv.prefix(),
[13]	812	Command: irc.ERR_NOMOTD,
[55]	813	Params: []string{dc.nick, "No MOTD"},
[54]	814	})
[13]	815
[296]	816	dc.updateNick()
	817
[73]	818	dc.forEachUpstream(func(uc *upstreamConn) {
[30]	819	for _, ch := range uc.channels {
[284]	820	if !ch.complete {
	821	continue
	822	}
	823	if record, ok := uc.network.channels[ch.Name]; ok && record.Detached {
	824	continue
	825	}
[132]	826
[284]	827	dc.SendMessage(&irc.Message{
	828	Prefix: dc.prefix(),
	829	Command: "JOIN",
	830	Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
	831	})
	832
	833	forwardChannel(dc, ch)
[30]	834	}
[143]	835	})
[50]	836
[143]	837	dc.forEachNetwork(func(net *network) {
[253]	838	// Only send history if we're the first connected client with that name
	839	// for the network
	840	if _, ok := net.offlineClients[dc.clientName]; ok {
	841	dc.sendNetworkHistory(net)
	842	delete(net.offlineClients, dc.clientName)
[227]	843	}
[253]	844	})
[57]	845
[253]	846	return nil
	847	}
[144]	848
[253]	849	func (dc downstreamConn) sendNetworkHistory(net network) {
[319]	850	if dc.caps["draft/chathistory"] {
	851	return
	852	}
[253]	853	for target, history := range net.history {
[284]	854	if ch, ok := net.channels[target]; ok && ch.Detached {
	855	continue
	856	}
	857
[253]	858	seq, ok := history.offlineClients[dc.clientName]
	859	if !ok {
	860	continue
	861	}
	862	delete(history.offlineClients, dc.clientName)
	863
	864	// If all clients have received history, no need to keep the
	865	// ring buffer around
	866	if len(history.offlineClients) == 0 {
	867	delete(net.history, target)
	868	}
	869
	870	consumer := history.ring.NewConsumer(seq)
	871
[256]	872	batchRef := "history"
	873	if dc.caps["batch"] {
	874	dc.SendMessage(&irc.Message{
	875	Prefix: dc.srv.prefix(),
	876	Command: "BATCH",
[260]	877	Params: []string{"+" + batchRef, "chathistory", dc.marshalEntity(net, target)},
[256]	878	})
	879	}
	880
[227]	881	for {
[233]	882	msg := consumer.Consume()
[227]	883	if msg == nil {
	884	break
[204]	885	}
	886
[245]	887	// Don't replay all messages, because that would mess up client
	888	// state. For instance we just sent the list of users, sending
	889	// PART messages for one of these users would be incorrect.
	890	ignore := true
	891	switch msg.Command {
	892	case "PRIVMSG", "NOTICE":
	893	ignore = false
	894	}
	895	if ignore {
	896	continue
	897	}
	898
[256]	899	if dc.caps["batch"] {
	900	msg = msg.Copy()
	901	msg.Tags["batch"] = irc.TagValue(batchRef)
	902	}
	903
[261]	904	dc.SendMessage(dc.marshalMessage(msg, net))
[227]	905	}
[256]	906
	907	if dc.caps["batch"] {
	908	dc.SendMessage(&irc.Message{
	909	Prefix: dc.srv.prefix(),
	910	Command: "BATCH",
	911	Params: []string{"-" + batchRef},
	912	})
	913	}
[253]	914	}
[13]	915	}
	916
[103]	917	func (dc *downstreamConn) runUntilRegistered() error {
	918	for !dc.registered {
[212]	919	msg, err := dc.ReadMessage()
[106]	920	if err != nil {
[103]	921	return fmt.Errorf("failed to read IRC command: %v", err)
	922	}
	923
	924	err = dc.handleMessage(msg)
	925	if ircErr, ok := err.(ircError); ok {
	926	ircErr.Message.Prefix = dc.srv.prefix()
	927	dc.SendMessage(ircErr.Message)
	928	} else if err != nil {
	929	return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
	930	}
	931	}
	932
	933	return nil
	934	}
	935
[55]	936	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	937	switch msg.Command {
[111]	938	case "CAP":
	939	var subCmd string
	940	if err := parseMessageParams(msg, &subCmd); err != nil {
	941	return err
	942	}
	943	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	944	return err
	945	}
[107]	946	case "PING":
	947	dc.SendMessage(&irc.Message{
	948	Prefix: dc.srv.prefix(),
	949	Command: "PONG",
	950	Params: msg.Params,
	951	})
	952	return nil
[42]	953	case "USER":
[13]	954	return ircError{&irc.Message{
	955	Command: irc.ERR_ALREADYREGISTERED,
[55]	956	Params: []string{dc.nick, "You may not reregister"},
[13]	957	}}
[42]	958	case "NICK":
[90]	959	var nick string
	960	if err := parseMessageParams(msg, &nick); err != nil {
	961	return err
	962	}
	963
[297]	964	var upstream *upstreamConn
	965	if dc.upstream() == nil {
	966	uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
	967	if err == nil { // NICK nick/network: NICK only on a specific upstream
	968	upstream = uc
	969	nick = unmarshaledNick
	970	}
	971	}
	972
[90]	973	var err error
	974	dc.forEachNetwork(func(n *network) {
[297]	975	if err != nil \|\| (upstream != nil && upstream.network != n) {
[90]	976	return
	977	}
	978	n.Nick = nick
	979	err = dc.srv.db.StoreNetwork(dc.user.Username, &n.Network)
	980	})
	981	if err != nil {
	982	return err
	983	}
	984
[73]	985	dc.forEachUpstream(func(uc *upstreamConn) {
[297]	986	if upstream != nil && upstream != uc {
	987	return
	988	}
[301]	989	uc.SendMessageLabeled(dc.id, &irc.Message{
[297]	990	Command: "NICK",
	991	Params: []string{nick},
	992	})
[42]	993	})
[296]	994
	995	if dc.upstream() == nil && dc.nick != nick {
	996	dc.SendMessage(&irc.Message{
	997	Prefix: dc.prefix(),
	998	Command: "NICK",
	999	Params: []string{nick},
	1000	})
	1001	dc.nick = nick
	1002	}
[146]	1003	case "JOIN":
	1004	var namesStr string
	1005	if err := parseMessageParams(msg, &namesStr); err != nil {
[48]	1006	return err
	1007	}
	1008
[146]	1009	var keys []string
	1010	if len(msg.Params) > 1 {
	1011	keys = strings.Split(msg.Params[1], ",")
	1012	}
	1013
	1014	for i, name := range strings.Split(namesStr, ",") {
[145]	1015	uc, upstreamName, err := dc.unmarshalEntity(name)
	1016	if err != nil {
[158]	1017	return err
[145]	1018	}
[48]	1019
[146]	1020	var key string
	1021	if len(keys) > i {
	1022	key = keys[i]
	1023	}
	1024
	1025	params := []string{upstreamName}
	1026	if key != "" {
	1027	params = append(params, key)
	1028	}
[301]	1029	uc.SendMessageLabeled(dc.id, &irc.Message{
[146]	1030	Command: "JOIN",
	1031	Params: params,
[145]	1032	})
[89]	1033
[284]	1034	ch := &Channel{Name: upstreamName, Key: key, Detached: false}
[285]	1035	if current, ok := uc.network.channels[ch.Name]; ok && key == "" {
	1036	// Don't clear the channel key if there's one set
	1037	// TODO: add a way to unset the channel key
	1038	ch.Key = current.Key
	1039	}
[222]	1040	if err := uc.network.createUpdateChannel(ch); err != nil {
	1041	dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
[89]	1042	}
	1043	}
[146]	1044	case "PART":
	1045	var namesStr string
	1046	if err := parseMessageParams(msg, &namesStr); err != nil {
	1047	return err
	1048	}
	1049
	1050	var reason string
	1051	if len(msg.Params) > 1 {
	1052	reason = msg.Params[1]
	1053	}
	1054
	1055	for _, name := range strings.Split(namesStr, ",") {
	1056	uc, upstreamName, err := dc.unmarshalEntity(name)
	1057	if err != nil {
[158]	1058	return err
[146]	1059	}
	1060
[284]	1061	if strings.EqualFold(reason, "detach") {
	1062	ch := &Channel{Name: upstreamName, Detached: true}
	1063	if err := uc.network.createUpdateChannel(ch); err != nil {
	1064	dc.logger.Printf("failed to detach channel %q: %v", upstreamName, err)
	1065	}
	1066	} else {
	1067	params := []string{upstreamName}
	1068	if reason != "" {
	1069	params = append(params, reason)
	1070	}
[301]	1071	uc.SendMessageLabeled(dc.id, &irc.Message{
[284]	1072	Command: "PART",
	1073	Params: params,
	1074	})
[146]	1075
[284]	1076	if err := uc.network.deleteChannel(upstreamName); err != nil {
	1077	dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
	1078	}
[146]	1079	}
	1080	}
[159]	1081	case "KICK":
	1082	var channelStr, userStr string
	1083	if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
	1084	return err
	1085	}
	1086
	1087	channels := strings.Split(channelStr, ",")
	1088	users := strings.Split(userStr, ",")
	1089
	1090	var reason string
	1091	if len(msg.Params) > 2 {
	1092	reason = msg.Params[2]
	1093	}
	1094
	1095	if len(channels) != 1 && len(channels) != len(users) {
	1096	return ircError{&irc.Message{
	1097	Command: irc.ERR_BADCHANMASK,
	1098	Params: []string{dc.nick, channelStr, "Bad channel mask"},
	1099	}}
	1100	}
	1101
	1102	for i, user := range users {
	1103	var channel string
	1104	if len(channels) == 1 {
	1105	channel = channels[0]
	1106	} else {
	1107	channel = channels[i]
	1108	}
	1109
	1110	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	1111	if err != nil {
	1112	return err
	1113	}
	1114
	1115	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	1116	if err != nil {
	1117	return err
	1118	}
	1119
	1120	if ucChannel != ucUser {
	1121	return ircError{&irc.Message{
	1122	Command: irc.ERR_USERNOTINCHANNEL,
	1123	Params: []string{dc.nick, user, channel, "They aren't on that channel"},
	1124	}}
	1125	}
	1126	uc := ucChannel
	1127
	1128	params := []string{upstreamChannel, upstreamUser}
	1129	if reason != "" {
	1130	params = append(params, reason)
	1131	}
[301]	1132	uc.SendMessageLabeled(dc.id, &irc.Message{
[159]	1133	Command: "KICK",
	1134	Params: params,
	1135	})
	1136	}
[69]	1137	case "MODE":
[46]	1138	var name string
	1139	if err := parseMessageParams(msg, &name); err != nil {
	1140	return err
	1141	}
	1142
	1143	var modeStr string
	1144	if len(msg.Params) > 1 {
	1145	modeStr = msg.Params[1]
	1146	}
	1147
[139]	1148	if name == dc.nick {
[46]	1149	if modeStr != "" {
[73]	1150	dc.forEachUpstream(func(uc *upstreamConn) {
[301]	1151	uc.SendMessageLabeled(dc.id, &irc.Message{
[69]	1152	Command: "MODE",
	1153	Params: []string{uc.nick, modeStr},
	1154	})
[46]	1155	})
	1156	} else {
[55]	1157	dc.SendMessage(&irc.Message{
	1158	Prefix: dc.srv.prefix(),
[46]	1159	Command: irc.RPL_UMODEIS,
[129]	1160	Params: []string{dc.nick, ""}, // TODO
[54]	1161	})
[46]	1162	}
[139]	1163	return nil
[46]	1164	}
[139]	1165
	1166	uc, upstreamName, err := dc.unmarshalEntity(name)
	1167	if err != nil {
	1168	return err
	1169	}
	1170
	1171	if !uc.isChannel(upstreamName) {
	1172	return ircError{&irc.Message{
	1173	Command: irc.ERR_USERSDONTMATCH,
	1174	Params: []string{dc.nick, "Cannot change mode for other users"},
	1175	}}
	1176	}
	1177
	1178	if modeStr != "" {
	1179	params := []string{upstreamName, modeStr}
	1180	params = append(params, msg.Params[2:]...)
[301]	1181	uc.SendMessageLabeled(dc.id, &irc.Message{
[139]	1182	Command: "MODE",
	1183	Params: params,
	1184	})
	1185	} else {
	1186	ch, ok := uc.channels[upstreamName]
	1187	if !ok {
	1188	return ircError{&irc.Message{
	1189	Command: irc.ERR_NOSUCHCHANNEL,
	1190	Params: []string{dc.nick, name, "No such channel"},
	1191	}}
	1192	}
	1193
	1194	if ch.modes == nil {
	1195	// we haven't received the initial RPL_CHANNELMODEIS yet
	1196	// ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
	1197	return nil
	1198	}
	1199
	1200	modeStr, modeParams := ch.modes.Format()
	1201	params := []string{dc.nick, name, modeStr}
	1202	params = append(params, modeParams...)
	1203
	1204	dc.SendMessage(&irc.Message{
	1205	Prefix: dc.srv.prefix(),
	1206	Command: irc.RPL_CHANNELMODEIS,
	1207	Params: params,
	1208	})
[162]	1209	if ch.creationTime != "" {
	1210	dc.SendMessage(&irc.Message{
	1211	Prefix: dc.srv.prefix(),
	1212	Command: rpl_creationtime,
	1213	Params: []string{dc.nick, name, ch.creationTime},
	1214	})
	1215	}
[139]	1216	}
[160]	1217	case "TOPIC":
	1218	var channel string
	1219	if err := parseMessageParams(msg, &channel); err != nil {
	1220	return err
	1221	}
	1222
	1223	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	1224	if err != nil {
	1225	return err
	1226	}
	1227
	1228	if len(msg.Params) > 1 { // setting topic
	1229	topic := msg.Params[1]
[301]	1230	uc.SendMessageLabeled(dc.id, &irc.Message{
[160]	1231	Command: "TOPIC",
	1232	Params: []string{upstreamChannel, topic},
	1233	})
	1234	} else { // getting topic
	1235	ch, ok := uc.channels[upstreamChannel]
	1236	if !ok {
	1237	return ircError{&irc.Message{
	1238	Command: irc.ERR_NOSUCHCHANNEL,
	1239	Params: []string{dc.nick, upstreamChannel, "No such channel"},
	1240	}}
	1241	}
	1242	sendTopic(dc, ch)
	1243	}
[177]	1244	case "LIST":
	1245	// TODO: support ELIST when supported by all upstreams
	1246
	1247	pl := pendingLIST{
	1248	downstreamID: dc.id,
	1249	pendingCommands: make(map[int64]*irc.Message),
	1250	}
[298]	1251	var upstream *upstreamConn
[177]	1252	var upstreamChannels map[int64][]string
	1253	if len(msg.Params) > 0 {
[298]	1254	uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
	1255	if err == nil && upstreamMask == "" { // LIST /network: send LIST only to one network
	1256	upstream = uc
	1257	} else {
	1258	upstreamChannels = make(map[int64][]string)
	1259	channels := strings.Split(msg.Params[0], ",")
	1260	for _, channel := range channels {
	1261	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	1262	if err != nil {
	1263	return err
	1264	}
	1265	upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
[177]	1266	}
	1267	}
	1268	}
	1269
	1270	dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
	1271	dc.forEachUpstream(func(uc *upstreamConn) {
[298]	1272	if upstream != nil && upstream != uc {
	1273	return
	1274	}
[177]	1275	var params []string
	1276	if upstreamChannels != nil {
	1277	if channels, ok := upstreamChannels[uc.network.ID]; ok {
	1278	params = []string{strings.Join(channels, ",")}
	1279	} else {
	1280	return
	1281	}
	1282	}
	1283	pl.pendingCommands[uc.network.ID] = &irc.Message{
	1284	Command: "LIST",
	1285	Params: params,
	1286	}
[181]	1287	uc.trySendLIST(dc.id)
[177]	1288	})
[140]	1289	case "NAMES":
	1290	if len(msg.Params) == 0 {
	1291	dc.SendMessage(&irc.Message{
	1292	Prefix: dc.srv.prefix(),
	1293	Command: irc.RPL_ENDOFNAMES,
	1294	Params: []string{dc.nick, "*", "End of /NAMES list"},
	1295	})
	1296	return nil
	1297	}
	1298
	1299	channels := strings.Split(msg.Params[0], ",")
	1300	for _, channel := range channels {
	1301	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	1302	if err != nil {
	1303	return err
	1304	}
	1305
	1306	ch, ok := uc.channels[upstreamChannel]
	1307	if ok {
	1308	sendNames(dc, ch)
	1309	} else {
	1310	// NAMES on a channel we have not joined, ask upstream
[176]	1311	uc.SendMessageLabeled(dc.id, &irc.Message{
[140]	1312	Command: "NAMES",
	1313	Params: []string{upstreamChannel},
	1314	})
	1315	}
	1316	}
[127]	1317	case "WHO":
	1318	if len(msg.Params) == 0 {
	1319	// TODO: support WHO without parameters
	1320	dc.SendMessage(&irc.Message{
	1321	Prefix: dc.srv.prefix(),
	1322	Command: irc.RPL_ENDOFWHO,
[140]	1323	Params: []string{dc.nick, "*", "End of /WHO list"},
[127]	1324	})
	1325	return nil
	1326	}
	1327
	1328	// TODO: support WHO masks
	1329	entity := msg.Params[0]
	1330
[142]	1331	if entity == dc.nick {
	1332	// TODO: support AWAY (H/G) in self WHO reply
	1333	dc.SendMessage(&irc.Message{
	1334	Prefix: dc.srv.prefix(),
	1335	Command: irc.RPL_WHOREPLY,
[184]	1336	Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
[142]	1337	})
	1338	dc.SendMessage(&irc.Message{
	1339	Prefix: dc.srv.prefix(),
	1340	Command: irc.RPL_ENDOFWHO,
	1341	Params: []string{dc.nick, dc.nick, "End of /WHO list"},
	1342	})
	1343	return nil
	1344	}
[343]	1345	if entity == serviceNick {
	1346	dc.SendMessage(&irc.Message{
	1347	Prefix: dc.srv.prefix(),
	1348	Command: irc.RPL_WHOREPLY,
	1349	Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
	1350	})
	1351	dc.SendMessage(&irc.Message{
	1352	Prefix: dc.srv.prefix(),
	1353	Command: irc.RPL_ENDOFWHO,
	1354	Params: []string{dc.nick, serviceNick, "End of /WHO list"},
	1355	})
	1356	return nil
	1357	}
[142]	1358
[127]	1359	uc, upstreamName, err := dc.unmarshalEntity(entity)
	1360	if err != nil {
	1361	return err
	1362	}
	1363
	1364	var params []string
	1365	if len(msg.Params) == 2 {
	1366	params = []string{upstreamName, msg.Params[1]}
	1367	} else {
	1368	params = []string{upstreamName}
	1369	}
	1370
[176]	1371	uc.SendMessageLabeled(dc.id, &irc.Message{
[127]	1372	Command: "WHO",
	1373	Params: params,
	1374	})
[128]	1375	case "WHOIS":
	1376	if len(msg.Params) == 0 {
	1377	return ircError{&irc.Message{
	1378	Command: irc.ERR_NONICKNAMEGIVEN,
	1379	Params: []string{dc.nick, "No nickname given"},
	1380	}}
	1381	}
	1382
	1383	var target, mask string
	1384	if len(msg.Params) == 1 {
	1385	target = ""
	1386	mask = msg.Params[0]
	1387	} else {
	1388	target = msg.Params[0]
	1389	mask = msg.Params[1]
	1390	}
	1391	// TODO: support multiple WHOIS users
	1392	if i := strings.IndexByte(mask, ','); i >= 0 {
	1393	mask = mask[:i]
	1394	}
	1395
[142]	1396	if mask == dc.nick {
	1397	dc.SendMessage(&irc.Message{
	1398	Prefix: dc.srv.prefix(),
	1399	Command: irc.RPL_WHOISUSER,
[184]	1400	Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
[142]	1401	})
	1402	dc.SendMessage(&irc.Message{
	1403	Prefix: dc.srv.prefix(),
	1404	Command: irc.RPL_WHOISSERVER,
	1405	Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
	1406	})
	1407	dc.SendMessage(&irc.Message{
	1408	Prefix: dc.srv.prefix(),
	1409	Command: irc.RPL_ENDOFWHOIS,
	1410	Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
	1411	})
	1412	return nil
	1413	}
	1414
[128]	1415	// TODO: support WHOIS masks
	1416	uc, upstreamNick, err := dc.unmarshalEntity(mask)
	1417	if err != nil {
	1418	return err
	1419	}
	1420
	1421	var params []string
	1422	if target != "" {
[299]	1423	if target == mask { // WHOIS nick nick
	1424	params = []string{upstreamNick, upstreamNick}
	1425	} else {
	1426	params = []string{target, upstreamNick}
	1427	}
[128]	1428	} else {
	1429	params = []string{upstreamNick}
	1430	}
	1431
[176]	1432	uc.SendMessageLabeled(dc.id, &irc.Message{
[128]	1433	Command: "WHOIS",
	1434	Params: params,
	1435	})
[58]	1436	case "PRIVMSG":
	1437	var targetsStr, text string
	1438	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	1439	return err
	1440	}
[303]	1441	tags := copyClientTags(msg.Tags)
[58]	1442
	1443	for _, name := range strings.Split(targetsStr, ",") {
[117]	1444	if name == serviceNick {
	1445	handleServicePRIVMSG(dc, text)
	1446	continue
	1447	}
	1448
[127]	1449	uc, upstreamName, err := dc.unmarshalEntity(name)
[58]	1450	if err != nil {
	1451	return err
	1452	}
	1453
[95]	1454	if upstreamName == "NickServ" {
	1455	dc.handleNickServPRIVMSG(uc, text)
	1456	}
	1457
[268]	1458	unmarshaledText := text
	1459	if uc.isChannel(upstreamName) {
	1460	unmarshaledText = dc.unmarshalText(uc, text)
	1461	}
[301]	1462	uc.SendMessageLabeled(dc.id, &irc.Message{
[303]	1463	Tags: tags,
[58]	1464	Command: "PRIVMSG",
[268]	1465	Params: []string{upstreamName, unmarshaledText},
[60]	1466	})
[105]	1467
[303]	1468	echoTags := tags.Copy()
	1469	echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[113]	1470	echoMsg := &irc.Message{
[303]	1471	Tags: echoTags,
[113]	1472	Prefix: &irc.Prefix{
	1473	Name: uc.nick,
	1474	User: uc.username,
	1475	},
[114]	1476	Command: "PRIVMSG",
[113]	1477	Params: []string{upstreamName, text},
	1478	}
[239]	1479	uc.produce(upstreamName, echoMsg, dc)
[58]	1480	}
[164]	1481	case "NOTICE":
	1482	var targetsStr, text string
	1483	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	1484	return err
	1485	}
[303]	1486	tags := copyClientTags(msg.Tags)
[164]	1487
	1488	for _, name := range strings.Split(targetsStr, ",") {
	1489	uc, upstreamName, err := dc.unmarshalEntity(name)
	1490	if err != nil {
	1491	return err
	1492	}
	1493
[268]	1494	unmarshaledText := text
	1495	if uc.isChannel(upstreamName) {
	1496	unmarshaledText = dc.unmarshalText(uc, text)
	1497	}
[301]	1498	uc.SendMessageLabeled(dc.id, &irc.Message{
[303]	1499	Tags: tags,
[164]	1500	Command: "NOTICE",
[268]	1501	Params: []string{upstreamName, unmarshaledText},
[164]	1502	})
	1503	}
[303]	1504	case "TAGMSG":
	1505	var targetsStr string
	1506	if err := parseMessageParams(msg, &targetsStr); err != nil {
	1507	return err
	1508	}
	1509	tags := copyClientTags(msg.Tags)
	1510
	1511	for _, name := range strings.Split(targetsStr, ",") {
	1512	uc, upstreamName, err := dc.unmarshalEntity(name)
	1513	if err != nil {
	1514	return err
	1515	}
	1516
	1517	uc.SendMessageLabeled(dc.id, &irc.Message{
	1518	Tags: tags,
	1519	Command: "TAGMSG",
	1520	Params: []string{upstreamName},
	1521	})
	1522	}
[163]	1523	case "INVITE":
	1524	var user, channel string
	1525	if err := parseMessageParams(msg, &user, &channel); err != nil {
	1526	return err
	1527	}
	1528
	1529	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	1530	if err != nil {
	1531	return err
	1532	}
	1533
	1534	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	1535	if err != nil {
	1536	return err
	1537	}
	1538
	1539	if ucChannel != ucUser {
	1540	return ircError{&irc.Message{
	1541	Command: irc.ERR_USERNOTINCHANNEL,
	1542	Params: []string{dc.nick, user, channel, "They aren't on that channel"},
	1543	}}
	1544	}
	1545	uc := ucChannel
	1546
[176]	1547	uc.SendMessageLabeled(dc.id, &irc.Message{
[163]	1548	Command: "INVITE",
	1549	Params: []string{upstreamUser, upstreamChannel},
	1550	})
[319]	1551	case "CHATHISTORY":
	1552	var subcommand string
	1553	if err := parseMessageParams(msg, &subcommand); err != nil {
	1554	return err
	1555	}
	1556	var target, criteria, limitStr string
	1557	if err := parseMessageParams(msg, nil, &target, &criteria, &limitStr); err != nil {
	1558	return ircError{&irc.Message{
	1559	Command: "FAIL",
	1560	Params: []string{"CHATHISTORY", "NEED_MORE_PARAMS", subcommand, "Missing parameters"},
	1561	}}
	1562	}
	1563
	1564	if dc.srv.LogPath == "" {
	1565	return ircError{&irc.Message{
	1566	Command: irc.ERR_UNKNOWNCOMMAND,
	1567	Params: []string{dc.nick, subcommand, "Unknown command"},
	1568	}}
	1569	}
	1570
	1571	uc, entity, err := dc.unmarshalEntity(target)
	1572	if err != nil {
	1573	return err
	1574	}
	1575
	1576	// TODO: support msgid criteria
	1577	criteriaParts := strings.SplitN(criteria, "=", 2)
	1578	if len(criteriaParts) != 2 \|\| criteriaParts[0] != "timestamp" {
	1579	return ircError{&irc.Message{
	1580	Command: "FAIL",
	1581	Params: []string{"CHATHISTORY", "UNKNOWN_CRITERIA", criteria, "Unknown criteria"},
	1582	}}
	1583	}
	1584
	1585	timestamp, err := time.Parse(serverTimeLayout, criteriaParts[1])
	1586	if err != nil {
	1587	return ircError{&irc.Message{
	1588	Command: "FAIL",
	1589	Params: []string{"CHATHISTORY", "INVALID_CRITERIA", criteria, "Invalid criteria"},
	1590	}}
	1591	}
	1592
	1593	limit, err := strconv.Atoi(limitStr)
	1594	if err != nil \|\| limit < 0 \|\| limit > dc.srv.HistoryLimit {
	1595	return ircError{&irc.Message{
	1596	Command: "FAIL",
	1597	Params: []string{"CHATHISTORY", "INVALID_LIMIT", limitStr, "Invalid limit"},
	1598	}}
	1599	}
	1600
[387]	1601	var history []*irc.Message
[319]	1602	switch subcommand {
	1603	case "BEFORE":
[387]	1604	history, err = loadHistoryBeforeTime(uc.network, entity, timestamp, limit)
[360]	1605	case "AFTER":
[387]	1606	history, err = loadHistoryAfterTime(uc.network, entity, timestamp, limit)
[319]	1607	default:
[360]	1608	// TODO: support LATEST, BETWEEN
[319]	1609	return ircError{&irc.Message{
	1610	Command: "FAIL",
	1611	Params: []string{"CHATHISTORY", "UNKNOWN_COMMAND", subcommand, "Unknown command"},
	1612	}}
	1613	}
[387]	1614	if err != nil {
	1615	dc.logger.Printf("failed parsing log messages for chathistory: %v", err)
	1616	return newChatHistoryError(subcommand, target)
	1617	}
	1618
	1619	batchRef := "history"
	1620	dc.SendMessage(&irc.Message{
	1621	Prefix: dc.srv.prefix(),
	1622	Command: "BATCH",
	1623	Params: []string{"+" + batchRef, "chathistory", target},
	1624	})
	1625
	1626	for _, msg := range history {
	1627	msg.Tags["batch"] = irc.TagValue(batchRef)
	1628	dc.SendMessage(dc.marshalMessage(msg, uc.network))
	1629	}
	1630
	1631	dc.SendMessage(&irc.Message{
	1632	Prefix: dc.srv.prefix(),
	1633	Command: "BATCH",
	1634	Params: []string{"-" + batchRef},
	1635	})
[13]	1636	default:
[55]	1637	dc.logger.Printf("unhandled message: %v", msg)
[13]	1638	return newUnknownCommandError(msg.Command)
	1639	}
[42]	1640	return nil
[13]	1641	}
[95]	1642
	1643	func (dc downstreamConn) handleNickServPRIVMSG(uc upstreamConn, text string) {
	1644	username, password, ok := parseNickServCredentials(text, uc.nick)
	1645	if !ok {
	1646	return
	1647	}
	1648
[307]	1649	// User may have e.g. EXTERNAL mechanism configured. We do not want to
	1650	// automatically erase the key pair or any other credentials.
	1651	if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
	1652	return
	1653	}
	1654
[95]	1655	dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
	1656	n := uc.network
	1657	n.SASL.Mechanism = "PLAIN"
	1658	n.SASL.Plain.Username = username
	1659	n.SASL.Plain.Password = password
	1660	if err := dc.srv.db.StoreNetwork(dc.user.Username, &n.Network); err != nil {
	1661	dc.logger.Printf("failed to save NickServ credentials: %v", err)
	1662	}
	1663	}
	1664
	1665	func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
	1666	fields := strings.Fields(text)
	1667	if len(fields) < 2 {
	1668	return "", "", false
	1669	}
	1670	cmd := strings.ToUpper(fields[0])
	1671	params := fields[1:]
	1672	switch cmd {
	1673	case "REGISTER":
	1674	username = nick
	1675	password = params[0]
	1676	case "IDENTIFY":
	1677	if len(params) == 1 {
	1678	username = nick
[182]	1679	password = params[0]
[95]	1680	} else {
	1681	username = params[0]
[182]	1682	password = params[1]
[95]	1683	}
[182]	1684	case "SET":
	1685	if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
	1686	username = nick
	1687	password = params[1]
	1688	}
[340]	1689	default:
	1690	return "", "", false
[95]	1691	}
	1692	return username, password, true
	1693	}

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