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source: code/trunk/downstream.go@ 636

Last change on this file since 636 was 636, checked in by contact, 4 years ago

Add bouncer MOTD

Closes: https://todo.sr.ht/~emersion/soju/137

File size: 62.0 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
[535]	60	func parseBouncerNetID(subcommand, s string) (int64, error) {
[532]	61	id, err := strconv.ParseInt(s, 10, 64)
	62	if err != nil {
	63	return 0, ircError{&irc.Message{
	64	Command: "FAIL",
[535]	65	Params: []string{"BOUNCER", "INVALID_NETID", subcommand, s, "Invalid network ID"},
[532]	66	}}
	67	}
	68	return id, nil
	69	}
	70
[535]	71	func getNetworkAttrs(network *network) irc.Tags {
	72	state := "disconnected"
	73	if uc := network.conn; uc != nil {
	74	state = "connected"
	75	}
	76
	77	attrs := irc.Tags{
	78	"name": irc.TagValue(network.GetName()),
	79	"state": irc.TagValue(state),
	80	"nickname": irc.TagValue(network.Nick),
	81	}
	82
	83	if network.Username != "" {
	84	attrs["username"] = irc.TagValue(network.Username)
	85	}
[568]	86	if realname := GetRealname(&network.user.User, &network.Network); realname != "" {
	87	attrs["realname"] = irc.TagValue(realname)
[535]	88	}
	89
	90	if u, err := network.URL(); err == nil {
	91	hasHostPort := true
	92	switch u.Scheme {
	93	case "ircs":
	94	attrs["tls"] = irc.TagValue("1")
	95	case "irc+insecure":
	96	attrs["tls"] = irc.TagValue("0")
	97	default:
	98	hasHostPort = false
	99	}
	100	if host, port, err := net.SplitHostPort(u.Host); err == nil && hasHostPort {
	101	attrs["host"] = irc.TagValue(host)
	102	attrs["port"] = irc.TagValue(port)
	103	} else if hasHostPort {
	104	attrs["host"] = irc.TagValue(u.Host)
	105	}
	106	}
	107
	108	return attrs
	109	}
	110
[411]	111	// ' ' and ':' break the IRC message wire format, '@' and '!' break prefixes,
[565]	112	// '*' and '?' break masks, '$' breaks server masks in PRIVMSG/NOTICE
	113	const illegalNickChars = " :@!*?$"
[404]	114
[275]	115	// permanentDownstreamCaps is the list of always-supported downstream
	116	// capabilities.
	117	var permanentDownstreamCaps = map[string]string{
[535]	118	"batch": "",
	119	"cap-notify": "",
	120	"echo-message": "",
	121	"invite-notify": "",
	122	"message-tags": "",
	123	"sasl": "PLAIN",
	124	"server-time": "",
[540]	125	"setname": "",
[535]	126
	127	"soju.im/bouncer-networks": "",
	128	"soju.im/bouncer-networks-notify": "",
[275]	129	}
	130
[292]	131	// needAllDownstreamCaps is the list of downstream capabilities that
	132	// require support from all upstreams to be enabled
	133	var needAllDownstreamCaps = map[string]string{
[559]	134	"account-tag": "",
[419]	135	"away-notify": "",
	136	"extended-join": "",
	137	"multi-prefix": "",
[292]	138	}
	139
[463]	140	// passthroughIsupport is the set of ISUPPORT tokens that are directly passed
	141	// through from the upstream server to downstream clients.
	142	//
	143	// This is only effective in single-upstream mode.
	144	var passthroughIsupport = map[string]bool{
[580]	145	"AWAYLEN": true,
	146	"BOT": true,
	147	"CHANLIMIT": true,
	148	"CHANMODES": true,
	149	"CHANNELLEN": true,
	150	"CHANTYPES": true,
	151	"CLIENTTAGDENY": true,
	152	"EXCEPTS": true,
	153	"EXTBAN": true,
	154	"HOSTLEN": true,
	155	"INVEX": true,
	156	"KICKLEN": true,
	157	"MAXLIST": true,
	158	"MAXTARGETS": true,
	159	"MODES": true,
	160	"NAMELEN": true,
	161	"NETWORK": true,
	162	"NICKLEN": true,
	163	"PREFIX": true,
	164	"SAFELIST": true,
	165	"TARGMAX": true,
	166	"TOPICLEN": true,
	167	"USERLEN": true,
	168	"UTF8ONLY": true,
[463]	169	}
	170
[13]	171	type downstreamConn struct {
[210]	172	conn
[22]	173
[210]	174	id uint64
	175
[100]	176	registered bool
	177	user *user
	178	nick string
[478]	179	nickCM string
[100]	180	rawUsername string
[168]	181	networkName string
[183]	182	clientName string
[100]	183	realname string
[141]	184	hostname string
[100]	185	password string // empty after authentication
	186	network *network // can be nil
[105]	187
[590]	188	negotiatingCaps bool
[108]	189	capVersion int
[275]	190	supportedCaps map[string]string
[236]	191	caps map[string]bool
[108]	192
[551]	193	lastBatchRef uint64
	194
[112]	195	saslServer sasl.Server
[13]	196	}
	197
[347]	198	func newDownstreamConn(srv Server, ic ircConn, id uint64) downstreamConn {
	199	remoteAddr := ic.RemoteAddr().String()
[323]	200	logger := &prefixLogger{srv.Logger, fmt.Sprintf("downstream %q: ", remoteAddr)}
[398]	201	options := connOptions{Logger: logger}
[55]	202	dc := &downstreamConn{
[398]	203	conn: *newConn(srv, ic, &options),
[276]	204	id: id,
[275]	205	supportedCaps: make(map[string]string),
[276]	206	caps: make(map[string]bool),
[22]	207	}
[323]	208	dc.hostname = remoteAddr
[141]	209	if host, _, err := net.SplitHostPort(dc.hostname); err == nil {
	210	dc.hostname = host
	211	}
[275]	212	for k, v := range permanentDownstreamCaps {
	213	dc.supportedCaps[k] = v
	214	}
[319]	215	if srv.LogPath != "" {
	216	dc.supportedCaps["draft/chathistory"] = ""
	217	}
[55]	218	return dc
[22]	219	}
	220
[55]	221	func (dc downstreamConn) prefix() irc.Prefix {
[27]	222	return &irc.Prefix{
[55]	223	Name: dc.nick,
[184]	224	User: dc.user.Username,
[141]	225	Host: dc.hostname,
[27]	226	}
	227	}
	228
[90]	229	func (dc downstreamConn) forEachNetwork(f func(network)) {
	230	if dc.network != nil {
	231	f(dc.network)
[532]	232	} else if !dc.caps["soju.im/bouncer-networks"] {
[90]	233	dc.user.forEachNetwork(f)
	234	}
	235	}
	236
[73]	237	func (dc downstreamConn) forEachUpstream(f func(upstreamConn)) {
[532]	238	if dc.network == nil && dc.caps["soju.im/bouncer-networks"] {
	239	return
	240	}
[73]	241	dc.user.forEachUpstream(func(uc *upstreamConn) {
[77]	242	if dc.network != nil && uc.network != dc.network {
[73]	243	return
	244	}
	245	f(uc)
	246	})
	247	}
	248
[89]	249	// upstream returns the upstream connection, if any. If there are zero or if
	250	// there are multiple upstream connections, it returns nil.
	251	func (dc downstreamConn) upstream() upstreamConn {
	252	if dc.network == nil {
	253	return nil
	254	}
[279]	255	return dc.network.conn
[89]	256	}
	257
[260]	258	func isOurNick(net *network, nick string) bool {
	259	// TODO: this doesn't account for nick changes
	260	if net.conn != nil {
[478]	261	return net.casemap(nick) == net.conn.nickCM
[260]	262	}
	263	// We're not currently connected to the upstream connection, so we don't
	264	// know whether this name is our nickname. Best-effort: use the network's
	265	// configured nickname and hope it was the one being used when we were
	266	// connected.
[478]	267	return net.casemap(nick) == net.casemap(net.Nick)
[260]	268	}
	269
[249]	270	// marshalEntity converts an upstream entity name (ie. channel or nick) into a
	271	// downstream entity name.
	272	//
	273	// This involves adding a "/<network>" suffix if the entity isn't the current
	274	// user.
[260]	275	func (dc downstreamConn) marshalEntity(net network, name string) string {
[289]	276	if isOurNick(net, name) {
	277	return dc.nick
	278	}
[478]	279	name = partialCasemap(net.casemap, name)
[257]	280	if dc.network != nil {
[260]	281	if dc.network != net {
[258]	282	panic("soju: tried to marshal an entity for another network")
	283	}
[257]	284	return name
[119]	285	}
[260]	286	return name + "/" + net.GetName()
[119]	287	}
	288
[260]	289	func (dc downstreamConn) marshalUserPrefix(net network, prefix irc.Prefix) irc.Prefix {
	290	if isOurNick(net, prefix.Name) {
[257]	291	return dc.prefix()
	292	}
[478]	293	prefix.Name = partialCasemap(net.casemap, prefix.Name)
[130]	294	if dc.network != nil {
[260]	295	if dc.network != net {
[258]	296	panic("soju: tried to marshal a user prefix for another network")
	297	}
[257]	298	return prefix
[119]	299	}
[257]	300	return &irc.Prefix{
[260]	301	Name: prefix.Name + "/" + net.GetName(),
[257]	302	User: prefix.User,
	303	Host: prefix.Host,
	304	}
[119]	305	}
	306
[584]	307	// unmarshalEntityNetwork converts a downstream entity name (ie. channel or
	308	// nick) into an upstream entity name.
[249]	309	//
	310	// This involves removing the "/<network>" suffix.
[584]	311	func (dc downstreamConn) unmarshalEntityNetwork(name string) (network, string, error) {
[464]	312	if dc.network != nil {
[584]	313	return dc.network, name, nil
[464]	314	}
[89]	315
[584]	316	var net *network
[119]	317	if i := strings.LastIndexByte(name, '/'); i >= 0 {
[127]	318	network := name[i+1:]
[119]	319	name = name[:i]
	320
[584]	321	for _, n := range dc.user.networks {
	322	if network == n.GetName() {
	323	net = n
	324	break
[119]	325	}
[584]	326	}
[119]	327	}
	328
[584]	329	if net == nil {
[73]	330	return nil, "", ircError{&irc.Message{
	331	Command: irc.ERR_NOSUCHCHANNEL,
[584]	332	Params: []string{name, "Missing network suffix in name"},
[73]	333	}}
[69]	334	}
[584]	335
	336	return net, name, nil
[69]	337	}
	338
[584]	339	// unmarshalEntity is the same as unmarshalEntityNetwork, but returns the
	340	// upstream connection and fails if the upstream is disconnected.
	341	func (dc downstreamConn) unmarshalEntity(name string) (upstreamConn, string, error) {
	342	net, name, err := dc.unmarshalEntityNetwork(name)
	343	if err != nil {
	344	return nil, "", err
	345	}
	346
	347	if net.conn == nil {
	348	return nil, "", ircError{&irc.Message{
	349	Command: irc.ERR_NOSUCHCHANNEL,
	350	Params: []string{name, "Disconnected from upstream network"},
	351	}}
	352	}
	353
	354	return net.conn, name, nil
	355	}
	356
[268]	357	func (dc downstreamConn) unmarshalText(uc upstreamConn, text string) string {
	358	if dc.upstream() != nil {
	359	return text
	360	}
	361	// TODO: smarter parsing that ignores URLs
	362	return strings.ReplaceAll(text, "/"+uc.network.GetName(), "")
	363	}
	364
[165]	365	func (dc *downstreamConn) readMessages(ch chan<- event) error {
[22]	366	for {
[210]	367	msg, err := dc.ReadMessage()
[22]	368	if err == io.EOF {
	369	break
	370	} else if err != nil {
	371	return fmt.Errorf("failed to read IRC command: %v", err)
	372	}
	373
[165]	374	ch <- eventDownstreamMessage{msg, dc}
[22]	375	}
	376
[45]	377	return nil
[22]	378	}
	379
[230]	380	// SendMessage sends an outgoing message.
	381	//
	382	// This can only called from the user goroutine.
[55]	383	func (dc downstreamConn) SendMessage(msg irc.Message) {
[230]	384	if !dc.caps["message-tags"] {
[303]	385	if msg.Command == "TAGMSG" {
	386	return
	387	}
[216]	388	msg = msg.Copy()
	389	for name := range msg.Tags {
	390	supported := false
	391	switch name {
	392	case "time":
[230]	393	supported = dc.caps["server-time"]
[559]	394	case "account":
	395	supported = dc.caps["account"]
[216]	396	}
	397	if !supported {
	398	delete(msg.Tags, name)
	399	}
	400	}
	401	}
[551]	402	if !dc.caps["batch"] && msg.Tags["batch"] != "" {
	403	msg = msg.Copy()
	404	delete(msg.Tags, "batch")
	405	}
[419]	406	if msg.Command == "JOIN" && !dc.caps["extended-join"] {
	407	msg.Params = msg.Params[:1]
	408	}
[540]	409	if msg.Command == "SETNAME" && !dc.caps["setname"] {
	410	return
	411	}
[216]	412
[210]	413	dc.conn.SendMessage(msg)
[54]	414	}
	415
[551]	416	func (dc *downstreamConn) SendBatch(typ string, params []string, tags irc.Tags, f func(batchRef irc.TagValue)) {
	417	dc.lastBatchRef++
	418	ref := fmt.Sprintf("%v", dc.lastBatchRef)
	419
	420	if dc.caps["batch"] {
	421	dc.SendMessage(&irc.Message{
	422	Tags: tags,
	423	Prefix: dc.srv.prefix(),
	424	Command: "BATCH",
	425	Params: append([]string{"+" + ref, typ}, params...),
	426	})
	427	}
	428
	429	f(irc.TagValue(ref))
	430
	431	if dc.caps["batch"] {
	432	dc.SendMessage(&irc.Message{
	433	Prefix: dc.srv.prefix(),
	434	Command: "BATCH",
	435	Params: []string{"-" + ref},
	436	})
	437	}
	438	}
	439
[428]	440	// sendMessageWithID sends an outgoing message with the specified internal ID.
	441	func (dc downstreamConn) sendMessageWithID(msg irc.Message, id string) {
	442	dc.SendMessage(msg)
	443
	444	if id == "" \|\| !dc.messageSupportsHistory(msg) {
	445	return
	446	}
	447
	448	dc.sendPing(id)
	449	}
	450
	451	// advanceMessageWithID advances history to the specified message ID without
	452	// sending a message. This is useful e.g. for self-messages when echo-message
	453	// isn't enabled.
	454	func (dc downstreamConn) advanceMessageWithID(msg irc.Message, id string) {
	455	if id == "" \|\| !dc.messageSupportsHistory(msg) {
	456	return
	457	}
	458
	459	dc.sendPing(id)
	460	}
	461
	462	// ackMsgID acknowledges that a message has been received.
	463	func (dc *downstreamConn) ackMsgID(id string) {
[488]	464	netID, entity, err := parseMsgID(id, nil)
[428]	465	if err != nil {
	466	dc.logger.Printf("failed to ACK message ID %q: %v", id, err)
	467	return
	468	}
	469
[440]	470	network := dc.user.getNetworkByID(netID)
[428]	471	if network == nil {
	472	return
	473	}
	474
[485]	475	network.delivered.StoreID(entity, dc.clientName, id)
[428]	476	}
	477
	478	func (dc *downstreamConn) sendPing(msgID string) {
[488]	479	token := "soju-msgid-" + msgID
[428]	480	dc.SendMessage(&irc.Message{
	481	Command: "PING",
	482	Params: []string{token},
	483	})
	484	}
	485
	486	func (dc *downstreamConn) handlePong(token string) {
	487	if !strings.HasPrefix(token, "soju-msgid-") {
	488	dc.logger.Printf("received unrecognized PONG token %q", token)
	489	return
	490	}
[488]	491	msgID := strings.TrimPrefix(token, "soju-msgid-")
[428]	492	dc.ackMsgID(msgID)
	493	}
	494
[245]	495	// marshalMessage re-formats a message coming from an upstream connection so
	496	// that it's suitable for being sent on this downstream connection. Only
[293]	497	// messages that may appear in logs are supported, except MODE.
[261]	498	func (dc downstreamConn) marshalMessage(msg irc.Message, net network) irc.Message {
[227]	499	msg = msg.Copy()
[261]	500	msg.Prefix = dc.marshalUserPrefix(net, msg.Prefix)
[245]	501
[227]	502	switch msg.Command {
[303]	503	case "PRIVMSG", "NOTICE", "TAGMSG":
[261]	504	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[245]	505	case "NICK":
	506	// Nick change for another user
[261]	507	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[245]	508	case "JOIN", "PART":
[261]	509	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[245]	510	case "KICK":
[261]	511	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
	512	msg.Params[1] = dc.marshalEntity(net, msg.Params[1])
[245]	513	case "TOPIC":
[261]	514	msg.Params[0] = dc.marshalEntity(net, msg.Params[0])
[540]	515	case "QUIT", "SETNAME":
[262]	516	// This space is intentionally left blank
[227]	517	default:
	518	panic(fmt.Sprintf("unexpected %q message", msg.Command))
	519	}
	520
[245]	521	return msg
[227]	522	}
	523
[55]	524	func (dc downstreamConn) handleMessage(msg irc.Message) error {
[13]	525	switch msg.Command {
[28]	526	case "QUIT":
[55]	527	return dc.Close()
[13]	528	default:
[55]	529	if dc.registered {
	530	return dc.handleMessageRegistered(msg)
[13]	531	} else {
[55]	532	return dc.handleMessageUnregistered(msg)
[13]	533	}
	534	}
	535	}
	536
[55]	537	func (dc downstreamConn) handleMessageUnregistered(msg irc.Message) error {
[13]	538	switch msg.Command {
	539	case "NICK":
[117]	540	var nick string
	541	if err := parseMessageParams(msg, &nick); err != nil {
[43]	542	return err
[13]	543	}
[404]	544	if strings.ContainsAny(nick, illegalNickChars) {
	545	return ircError{&irc.Message{
	546	Command: irc.ERR_ERRONEUSNICKNAME,
	547	Params: []string{dc.nick, nick, "contains illegal characters"},
	548	}}
	549	}
[478]	550	nickCM := casemapASCII(nick)
	551	if nickCM == serviceNickCM {
[117]	552	return ircError{&irc.Message{
	553	Command: irc.ERR_NICKNAMEINUSE,
	554	Params: []string{dc.nick, nick, "Nickname reserved for bouncer service"},
	555	}}
	556	}
	557	dc.nick = nick
[478]	558	dc.nickCM = nickCM
[13]	559	case "USER":
[117]	560	if err := parseMessageParams(msg, &dc.rawUsername, nil, nil, &dc.realname); err != nil {
[43]	561	return err
[13]	562	}
[85]	563	case "PASS":
	564	if err := parseMessageParams(msg, &dc.password); err != nil {
	565	return err
	566	}
[108]	567	case "CAP":
	568	var subCmd string
	569	if err := parseMessageParams(msg, &subCmd); err != nil {
	570	return err
	571	}
	572	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	573	return err
	574	}
[112]	575	case "AUTHENTICATE":
[230]	576	if !dc.caps["sasl"] {
[112]	577	return ircError{&irc.Message{
[125]	578	Command: irc.ERR_SASLFAIL,
[112]	579	Params: []string{"*", "AUTHENTICATE requires the \"sasl\" capability to be enabled"},
	580	}}
	581	}
	582	if len(msg.Params) == 0 {
	583	return ircError{&irc.Message{
[125]	584	Command: irc.ERR_SASLFAIL,
[112]	585	Params: []string{"*", "Missing AUTHENTICATE argument"},
	586	}}
	587	}
	588	if dc.nick == "" {
	589	return ircError{&irc.Message{
[125]	590	Command: irc.ERR_SASLFAIL,
[112]	591	Params: []string{"*", "Expected NICK command before AUTHENTICATE"},
	592	}}
	593	}
	594
	595	var resp []byte
	596	if dc.saslServer == nil {
	597	mech := strings.ToUpper(msg.Params[0])
	598	switch mech {
	599	case "PLAIN":
	600	dc.saslServer = sasl.NewPlainServer(sasl.PlainAuthenticator(func(identity, username, password string) error {
	601	return dc.authenticate(username, password)
	602	}))
	603	default:
	604	return ircError{&irc.Message{
[125]	605	Command: irc.ERR_SASLFAIL,
[112]	606	Params: []string{"*", fmt.Sprintf("Unsupported SASL mechanism %q", mech)},
	607	}}
	608	}
	609	} else if msg.Params[0] == "*" {
	610	dc.saslServer = nil
	611	return ircError{&irc.Message{
[125]	612	Command: irc.ERR_SASLABORTED,
[112]	613	Params: []string{"*", "SASL authentication aborted"},
	614	}}
	615	} else if msg.Params[0] == "+" {
	616	resp = nil
	617	} else {
	618	// TODO: multi-line messages
	619	var err error
	620	resp, err = base64.StdEncoding.DecodeString(msg.Params[0])
	621	if err != nil {
	622	dc.saslServer = nil
	623	return ircError{&irc.Message{
[125]	624	Command: irc.ERR_SASLFAIL,
[112]	625	Params: []string{"*", "Invalid base64-encoded response"},
	626	}}
	627	}
	628	}
	629
	630	challenge, done, err := dc.saslServer.Next(resp)
	631	if err != nil {
	632	dc.saslServer = nil
	633	if ircErr, ok := err.(ircError); ok && ircErr.Message.Command == irc.ERR_PASSWDMISMATCH {
	634	return ircError{&irc.Message{
[125]	635	Command: irc.ERR_SASLFAIL,
[112]	636	Params: []string{"*", ircErr.Message.Params[1]},
	637	}}
	638	}
	639	dc.SendMessage(&irc.Message{
	640	Prefix: dc.srv.prefix(),
[125]	641	Command: irc.ERR_SASLFAIL,
[112]	642	Params: []string{"*", "SASL error"},
	643	})
	644	return fmt.Errorf("SASL authentication failed: %v", err)
	645	} else if done {
	646	dc.saslServer = nil
	647	dc.SendMessage(&irc.Message{
	648	Prefix: dc.srv.prefix(),
[125]	649	Command: irc.RPL_LOGGEDIN,
[306]	650	Params: []string{dc.nick, dc.prefix().String(), dc.user.Username, "You are now logged in"},
[112]	651	})
	652	dc.SendMessage(&irc.Message{
	653	Prefix: dc.srv.prefix(),
[125]	654	Command: irc.RPL_SASLSUCCESS,
[112]	655	Params: []string{dc.nick, "SASL authentication successful"},
	656	})
	657	} else {
	658	challengeStr := "+"
[135]	659	if len(challenge) > 0 {
[112]	660	challengeStr = base64.StdEncoding.EncodeToString(challenge)
	661	}
	662
	663	// TODO: multi-line messages
	664	dc.SendMessage(&irc.Message{
	665	Prefix: dc.srv.prefix(),
	666	Command: "AUTHENTICATE",
	667	Params: []string{challengeStr},
	668	})
	669	}
[532]	670	case "BOUNCER":
	671	var subcommand string
	672	if err := parseMessageParams(msg, &subcommand); err != nil {
	673	return err
	674	}
	675
	676	switch strings.ToUpper(subcommand) {
	677	case "BIND":
	678	var idStr string
	679	if err := parseMessageParams(msg, nil, &idStr); err != nil {
	680	return err
	681	}
	682
	683	if dc.registered {
	684	return ircError{&irc.Message{
	685	Command: "FAIL",
	686	Params: []string{"BOUNCER", "REGISTRATION_IS_COMPLETED", "BIND", "Cannot bind bouncer network after registration"},
	687	}}
	688	}
	689	if dc.user == nil {
	690	return ircError{&irc.Message{
	691	Command: "FAIL",
	692	Params: []string{"BOUNCER", "ACCOUNT_REQUIRED", "BIND", "Authentication needed to bind to bouncer network"},
	693	}}
	694	}
	695
[535]	696	id, err := parseBouncerNetID(subcommand, idStr)
[532]	697	if err != nil {
	698	return err
	699	}
	700
	701	var match *network
	702	dc.user.forEachNetwork(func(net *network) {
	703	if net.ID == id {
	704	match = net
	705	}
	706	})
	707	if match == nil {
	708	return ircError{&irc.Message{
	709	Command: "FAIL",
	710	Params: []string{"BOUNCER", "INVALID_NETID", idStr, "Unknown network ID"},
	711	}}
	712	}
	713
	714	dc.networkName = match.GetName()
	715	}
[13]	716	default:
[55]	717	dc.logger.Printf("unhandled message: %v", msg)
[13]	718	return newUnknownCommandError(msg.Command)
	719	}
[590]	720	if dc.rawUsername != "" && dc.nick != "" && !dc.negotiatingCaps {
[55]	721	return dc.register()
[13]	722	}
	723	return nil
	724	}
	725
[108]	726	func (dc *downstreamConn) handleCapCommand(cmd string, args []string) error {
[111]	727	cmd = strings.ToUpper(cmd)
	728
[108]	729	replyTo := dc.nick
	730	if !dc.registered {
	731	replyTo = "*"
	732	}
	733
	734	switch cmd {
	735	case "LS":
	736	if len(args) > 0 {
	737	var err error
	738	if dc.capVersion, err = strconv.Atoi(args[0]); err != nil {
	739	return err
	740	}
	741	}
[437]	742	if !dc.registered && dc.capVersion >= 302 {
	743	// Let downstream show everything it supports, and trim
	744	// down the available capabilities when upstreams are
	745	// known.
	746	for k, v := range needAllDownstreamCaps {
	747	dc.supportedCaps[k] = v
	748	}
	749	}
[108]	750
[275]	751	caps := make([]string, 0, len(dc.supportedCaps))
	752	for k, v := range dc.supportedCaps {
	753	if dc.capVersion >= 302 && v != "" {
[276]	754	caps = append(caps, k+"="+v)
[275]	755	} else {
	756	caps = append(caps, k)
	757	}
[112]	758	}
[108]	759
	760	// TODO: multi-line replies
	761	dc.SendMessage(&irc.Message{
	762	Prefix: dc.srv.prefix(),
	763	Command: "CAP",
	764	Params: []string{replyTo, "LS", strings.Join(caps, " ")},
	765	})
	766
[275]	767	if dc.capVersion >= 302 {
	768	// CAP version 302 implicitly enables cap-notify
	769	dc.caps["cap-notify"] = true
	770	}
	771
[108]	772	if !dc.registered {
[590]	773	dc.negotiatingCaps = true
[108]	774	}
	775	case "LIST":
	776	var caps []string
[521]	777	for name, enabled := range dc.caps {
	778	if enabled {
	779	caps = append(caps, name)
	780	}
[108]	781	}
	782
	783	// TODO: multi-line replies
	784	dc.SendMessage(&irc.Message{
	785	Prefix: dc.srv.prefix(),
	786	Command: "CAP",
	787	Params: []string{replyTo, "LIST", strings.Join(caps, " ")},
	788	})
	789	case "REQ":
	790	if len(args) == 0 {
	791	return ircError{&irc.Message{
	792	Command: err_invalidcapcmd,
	793	Params: []string{replyTo, cmd, "Missing argument in CAP REQ command"},
	794	}}
	795	}
	796
[275]	797	// TODO: atomically ack/nak the whole capability set
[108]	798	caps := strings.Fields(args[0])
	799	ack := true
	800	for _, name := range caps {
	801	name = strings.ToLower(name)
	802	enable := !strings.HasPrefix(name, "-")
	803	if !enable {
	804	name = strings.TrimPrefix(name, "-")
	805	}
	806
[275]	807	if enable == dc.caps[name] {
[108]	808	continue
	809	}
	810
[275]	811	_, ok := dc.supportedCaps[name]
	812	if !ok {
[108]	813	ack = false
[275]	814	break
[108]	815	}
[275]	816
	817	if name == "cap-notify" && dc.capVersion >= 302 && !enable {
	818	// cap-notify cannot be disabled with CAP version 302
	819	ack = false
	820	break
	821	}
	822
	823	dc.caps[name] = enable
[108]	824	}
	825
	826	reply := "NAK"
	827	if ack {
	828	reply = "ACK"
	829	}
	830	dc.SendMessage(&irc.Message{
	831	Prefix: dc.srv.prefix(),
	832	Command: "CAP",
	833	Params: []string{replyTo, reply, args[0]},
	834	})
[590]	835
	836	if !dc.registered {
	837	dc.negotiatingCaps = true
	838	}
[108]	839	case "END":
[590]	840	dc.negotiatingCaps = false
[108]	841	default:
	842	return ircError{&irc.Message{
	843	Command: err_invalidcapcmd,
	844	Params: []string{replyTo, cmd, "Unknown CAP command"},
	845	}}
	846	}
	847	return nil
	848	}
	849
[275]	850	func (dc *downstreamConn) setSupportedCap(name, value string) {
	851	prevValue, hasPrev := dc.supportedCaps[name]
	852	changed := !hasPrev \|\| prevValue != value
	853	dc.supportedCaps[name] = value
	854
	855	if !dc.caps["cap-notify"] \|\| !changed {
	856	return
	857	}
	858
	859	replyTo := dc.nick
	860	if !dc.registered {
	861	replyTo = "*"
	862	}
	863
	864	cap := name
	865	if value != "" && dc.capVersion >= 302 {
	866	cap = name + "=" + value
	867	}
	868
	869	dc.SendMessage(&irc.Message{
	870	Prefix: dc.srv.prefix(),
	871	Command: "CAP",
	872	Params: []string{replyTo, "NEW", cap},
	873	})
	874	}
	875
	876	func (dc *downstreamConn) unsetSupportedCap(name string) {
	877	_, hasPrev := dc.supportedCaps[name]
	878	delete(dc.supportedCaps, name)
	879	delete(dc.caps, name)
	880
	881	if !dc.caps["cap-notify"] \|\| !hasPrev {
	882	return
	883	}
	884
	885	replyTo := dc.nick
	886	if !dc.registered {
	887	replyTo = "*"
	888	}
	889
	890	dc.SendMessage(&irc.Message{
	891	Prefix: dc.srv.prefix(),
	892	Command: "CAP",
	893	Params: []string{replyTo, "DEL", name},
	894	})
	895	}
	896
[276]	897	func (dc *downstreamConn) updateSupportedCaps() {
[292]	898	supportedCaps := make(map[string]bool)
	899	for cap := range needAllDownstreamCaps {
	900	supportedCaps[cap] = true
	901	}
[276]	902	dc.forEachUpstream(func(uc *upstreamConn) {
[292]	903	for cap, supported := range supportedCaps {
	904	supportedCaps[cap] = supported && uc.caps[cap]
	905	}
[276]	906	})
	907
[292]	908	for cap, supported := range supportedCaps {
	909	if supported {
	910	dc.setSupportedCap(cap, needAllDownstreamCaps[cap])
	911	} else {
	912	dc.unsetSupportedCap(cap)
	913	}
[276]	914	}
	915	}
	916
[296]	917	func (dc *downstreamConn) updateNick() {
	918	if uc := dc.upstream(); uc != nil && uc.nick != dc.nick {
	919	dc.SendMessage(&irc.Message{
	920	Prefix: dc.prefix(),
	921	Command: "NICK",
	922	Params: []string{uc.nick},
	923	})
	924	dc.nick = uc.nick
[478]	925	dc.nickCM = casemapASCII(dc.nick)
[296]	926	}
	927	}
	928
[540]	929	func (dc *downstreamConn) updateRealname() {
	930	if uc := dc.upstream(); uc != nil && uc.realname != dc.realname && dc.caps["setname"] {
	931	dc.SendMessage(&irc.Message{
	932	Prefix: dc.prefix(),
	933	Command: "SETNAME",
	934	Params: []string{uc.realname},
	935	})
	936	dc.realname = uc.realname
	937	}
	938	}
	939
[91]	940	func sanityCheckServer(addr string) error {
	941	dialer := net.Dialer{Timeout: 30 * time.Second}
	942	conn, err := tls.DialWithDialer(&dialer, "tcp", addr, nil)
	943	if err != nil {
	944	return err
	945	}
	946	return conn.Close()
	947	}
	948
[183]	949	func unmarshalUsername(rawUsername string) (username, client, network string) {
[112]	950	username = rawUsername
[183]	951
	952	i := strings.IndexAny(username, "/@")
	953	j := strings.LastIndexAny(username, "/@")
	954	if i >= 0 {
	955	username = rawUsername[:i]
[73]	956	}
[183]	957	if j >= 0 {
[190]	958	if rawUsername[j] == '@' {
	959	client = rawUsername[j+1:]
	960	} else {
	961	network = rawUsername[j+1:]
	962	}
[73]	963	}
[183]	964	if i >= 0 && j >= 0 && i < j {
[190]	965	if rawUsername[i] == '@' {
	966	client = rawUsername[i+1 : j]
	967	} else {
	968	network = rawUsername[i+1 : j]
	969	}
[183]	970	}
	971
	972	return username, client, network
[112]	973	}
[73]	974
[168]	975	func (dc *downstreamConn) authenticate(username, password string) error {
[183]	976	username, clientName, networkName := unmarshalUsername(username)
[168]	977
[173]	978	u, err := dc.srv.db.GetUser(username)
	979	if err != nil {
[438]	980	dc.logger.Printf("failed authentication for %q: user not found: %v", username, err)
[168]	981	return errAuthFailed
	982	}
	983
[322]	984	// Password auth disabled
	985	if u.Password == "" {
	986	return errAuthFailed
	987	}
	988
[173]	989	err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
[168]	990	if err != nil {
[438]	991	dc.logger.Printf("failed authentication for %q: wrong password: %v", username, err)
[168]	992	return errAuthFailed
	993	}
	994
[173]	995	dc.user = dc.srv.getUser(username)
	996	if dc.user == nil {
	997	dc.logger.Printf("failed authentication for %q: user not active", username)
	998	return errAuthFailed
	999	}
[183]	1000	dc.clientName = clientName
[168]	1001	dc.networkName = networkName
	1002	return nil
	1003	}
	1004
	1005	func (dc *downstreamConn) register() error {
	1006	if dc.registered {
	1007	return fmt.Errorf("tried to register twice")
	1008	}
	1009
	1010	password := dc.password
	1011	dc.password = ""
	1012	if dc.user == nil {
	1013	if err := dc.authenticate(dc.rawUsername, password); err != nil {
	1014	return err
	1015	}
	1016	}
	1017
[183]	1018	if dc.clientName == "" && dc.networkName == "" {
	1019	_, dc.clientName, dc.networkName = unmarshalUsername(dc.rawUsername)
[168]	1020	}
	1021
	1022	dc.registered = true
[184]	1023	dc.logger.Printf("registration complete for user %q", dc.user.Username)
[168]	1024	return nil
	1025	}
	1026
	1027	func (dc *downstreamConn) loadNetwork() error {
	1028	if dc.networkName == "" {
[112]	1029	return nil
	1030	}
[85]	1031
[168]	1032	network := dc.user.getNetwork(dc.networkName)
[112]	1033	if network == nil {
[168]	1034	addr := dc.networkName
[112]	1035	if !strings.ContainsRune(addr, ':') {
	1036	addr = addr + ":6697"
	1037	}
	1038
	1039	dc.logger.Printf("trying to connect to new network %q", addr)
	1040	if err := sanityCheckServer(addr); err != nil {
	1041	dc.logger.Printf("failed to connect to %q: %v", addr, err)
	1042	return ircError{&irc.Message{
	1043	Command: irc.ERR_PASSWDMISMATCH,
[168]	1044	Params: []string{"*", fmt.Sprintf("Failed to connect to %q", dc.networkName)},
[112]	1045	}}
	1046	}
	1047
[354]	1048	// Some clients only allow specifying the nickname (and use the
	1049	// nickname as a username too). Strip the network name from the
	1050	// nickname when auto-saving networks.
	1051	nick, _, _ := unmarshalUsername(dc.nick)
	1052
[168]	1053	dc.logger.Printf("auto-saving network %q", dc.networkName)
[112]	1054	var err error
[120]	1055	network, err = dc.user.createNetwork(&Network{
[542]	1056	Addr: dc.networkName,
	1057	Nick: nick,
	1058	Enabled: true,
[120]	1059	})
[112]	1060	if err != nil {
	1061	return err
	1062	}
	1063	}
	1064
	1065	dc.network = network
	1066	return nil
	1067	}
	1068
[168]	1069	func (dc *downstreamConn) welcome() error {
	1070	if dc.user == nil \|\| !dc.registered {
	1071	panic("tried to welcome an unregistered connection")
[37]	1072	}
	1073
[168]	1074	// TODO: doing this might take some time. We should do it in dc.register
	1075	// instead, but we'll potentially be adding a new network and this must be
	1076	// done in the user goroutine.
	1077	if err := dc.loadNetwork(); err != nil {
	1078	return err
[85]	1079	}
	1080
[446]	1081	isupport := []string{
	1082	fmt.Sprintf("CHATHISTORY=%v", dc.srv.HistoryLimit),
[478]	1083	"CASEMAPPING=ascii",
[446]	1084	}
	1085
[532]	1086	if dc.network != nil {
	1087	isupport = append(isupport, fmt.Sprintf("BOUNCER_NETID=%v", dc.network.ID))
	1088	}
	1089
[463]	1090	if uc := dc.upstream(); uc != nil {
	1091	for k := range passthroughIsupport {
	1092	v, ok := uc.isupport[k]
	1093	if !ok {
	1094	continue
	1095	}
	1096	if v != nil {
	1097	isupport = append(isupport, fmt.Sprintf("%v=%v", k, *v))
	1098	} else {
	1099	isupport = append(isupport, k)
	1100	}
	1101	}
[447]	1102	}
	1103
[55]	1104	dc.SendMessage(&irc.Message{
	1105	Prefix: dc.srv.prefix(),
[13]	1106	Command: irc.RPL_WELCOME,
[98]	1107	Params: []string{dc.nick, "Welcome to soju, " + dc.nick},
[54]	1108	})
[55]	1109	dc.SendMessage(&irc.Message{
	1110	Prefix: dc.srv.prefix(),
[13]	1111	Command: irc.RPL_YOURHOST,
[55]	1112	Params: []string{dc.nick, "Your host is " + dc.srv.Hostname},
[54]	1113	})
[55]	1114	dc.SendMessage(&irc.Message{
	1115	Prefix: dc.srv.prefix(),
[13]	1116	Command: irc.RPL_MYINFO,
[98]	1117	Params: []string{dc.nick, dc.srv.Hostname, "soju", "aiwroO", "OovaimnqpsrtklbeI"},
[54]	1118	})
[463]	1119	for _, msg := range generateIsupport(dc.srv.prefix(), dc.nick, isupport) {
	1120	dc.SendMessage(msg)
	1121	}
[553]	1122	if uc := dc.upstream(); uc != nil {
	1123	dc.SendMessage(&irc.Message{
	1124	Prefix: dc.srv.prefix(),
	1125	Command: irc.RPL_UMODEIS,
	1126	Params: []string{dc.nick, string(uc.modes)},
	1127	})
	1128	}
[13]	1129
[636]	1130	if motd := dc.user.srv.MOTD(); motd != "" && dc.network == nil {
	1131	for _, msg := range generateMOTD(dc.srv.prefix(), dc.nick, motd) {
	1132	dc.SendMessage(msg)
	1133	}
	1134	} else {
	1135	motdHint := "No MOTD"
	1136	if dc.network != nil {
	1137	motdHint = "Use /motd to read the message of the day"
	1138	}
	1139	dc.SendMessage(&irc.Message{
	1140	Prefix: dc.srv.prefix(),
	1141	Command: irc.ERR_NOMOTD,
	1142	Params: []string{dc.nick, motdHint},
	1143	})
	1144	}
	1145
[296]	1146	dc.updateNick()
[540]	1147	dc.updateRealname()
[437]	1148	dc.updateSupportedCaps()
[296]	1149
[535]	1150	if dc.caps["soju.im/bouncer-networks-notify"] {
[551]	1151	dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
	1152	dc.user.forEachNetwork(func(network *network) {
	1153	idStr := fmt.Sprintf("%v", network.ID)
	1154	attrs := getNetworkAttrs(network)
	1155	dc.SendMessage(&irc.Message{
	1156	Tags: irc.Tags{"batch": batchRef},
	1157	Prefix: dc.srv.prefix(),
	1158	Command: "BOUNCER",
	1159	Params: []string{"NETWORK", idStr, attrs.String()},
	1160	})
[535]	1161	})
	1162	})
	1163	}
	1164
[73]	1165	dc.forEachUpstream(func(uc *upstreamConn) {
[478]	1166	for _, entry := range uc.channels.innerMap {
	1167	ch := entry.value.(*upstreamChannel)
[284]	1168	if !ch.complete {
	1169	continue
	1170	}
[478]	1171	record := uc.network.channels.Value(ch.Name)
	1172	if record != nil && record.Detached {
[284]	1173	continue
	1174	}
[132]	1175
[284]	1176	dc.SendMessage(&irc.Message{
	1177	Prefix: dc.prefix(),
	1178	Command: "JOIN",
	1179	Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
	1180	})
	1181
	1182	forwardChannel(dc, ch)
[30]	1183	}
[143]	1184	})
[50]	1185
[143]	1186	dc.forEachNetwork(func(net *network) {
[496]	1187	if dc.caps["draft/chathistory"] \|\| dc.user.msgStore == nil {
	1188	return
	1189	}
	1190
[253]	1191	// Only send history if we're the first connected client with that name
	1192	// for the network
[482]	1193	firstClient := true
	1194	dc.user.forEachDownstream(func(c *downstreamConn) {
	1195	if c != dc && c.clientName == dc.clientName && c.network == dc.network {
	1196	firstClient = false
	1197	}
	1198	})
	1199	if firstClient {
[485]	1200	net.delivered.ForEachTarget(func(target string) {
[495]	1201	lastDelivered := net.delivered.LoadID(target, dc.clientName)
	1202	if lastDelivered == "" {
	1203	return
	1204	}
	1205
	1206	dc.sendTargetBacklog(net, target, lastDelivered)
	1207
	1208	// Fast-forward history to last message
	1209	targetCM := net.casemap(target)
	1210	lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
	1211	if err != nil {
	1212	dc.logger.Printf("failed to get last message ID: %v", err)
	1213	return
	1214	}
	1215	net.delivered.StoreID(target, dc.clientName, lastID)
[485]	1216	})
[227]	1217	}
[253]	1218	})
[57]	1219
[253]	1220	return nil
	1221	}
[144]	1222
[428]	1223	// messageSupportsHistory checks whether the provided message can be sent as
	1224	// part of an history batch.
	1225	func (dc downstreamConn) messageSupportsHistory(msg irc.Message) bool {
	1226	// Don't replay all messages, because that would mess up client
	1227	// state. For instance we just sent the list of users, sending
	1228	// PART messages for one of these users would be incorrect.
	1229	// TODO: add support for draft/event-playback
	1230	switch msg.Command {
	1231	case "PRIVMSG", "NOTICE":
	1232	return true
	1233	}
	1234	return false
	1235	}
	1236
[495]	1237	func (dc downstreamConn) sendTargetBacklog(net network, target, msgID string) {
[423]	1238	if dc.caps["draft/chathistory"] \|\| dc.user.msgStore == nil {
[319]	1239	return
	1240	}
[485]	1241
[499]	1242	ch := net.channels.Value(target)
	1243
[452]	1244	limit := 4000
[484]	1245	targetCM := net.casemap(target)
[495]	1246	history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
[452]	1247	if err != nil {
[495]	1248	dc.logger.Printf("failed to send backlog for %q: %v", target, err)
[452]	1249	return
	1250	}
[253]	1251
[551]	1252	dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
	1253	for _, msg := range history {
	1254	if !dc.messageSupportsHistory(msg) {
	1255	continue
	1256	}
[452]	1257
[551]	1258	if ch != nil && ch.Detached {
	1259	if net.detachedMessageNeedsRelay(ch, msg) {
	1260	dc.relayDetachedMessage(net, msg)
	1261	}
	1262	} else {
	1263	if dc.caps["batch"] {
	1264	msg.Tags["batch"] = irc.TagValue(batchRef)
	1265	}
	1266	dc.SendMessage(dc.marshalMessage(msg, net))
[499]	1267	}
[256]	1268	}
[551]	1269	})
[13]	1270	}
	1271
[499]	1272	func (dc downstreamConn) relayDetachedMessage(net network, msg *irc.Message) {
	1273	if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
	1274	return
	1275	}
	1276
	1277	sender := msg.Prefix.Name
	1278	target, text := msg.Params[0], msg.Params[1]
	1279	if net.isHighlight(msg) {
	1280	sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
	1281	} else {
	1282	sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
	1283	}
	1284	}
	1285
[103]	1286	func (dc *downstreamConn) runUntilRegistered() error {
	1287	for !dc.registered {
[212]	1288	msg, err := dc.ReadMessage()
[106]	1289	if err != nil {
[103]	1290	return fmt.Errorf("failed to read IRC command: %v", err)
	1291	}
	1292
	1293	err = dc.handleMessage(msg)
	1294	if ircErr, ok := err.(ircError); ok {
	1295	ircErr.Message.Prefix = dc.srv.prefix()
	1296	dc.SendMessage(ircErr.Message)
	1297	} else if err != nil {
	1298	return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
	1299	}
	1300	}
	1301
	1302	return nil
	1303	}
	1304
[55]	1305	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	1306	switch msg.Command {
[111]	1307	case "CAP":
	1308	var subCmd string
	1309	if err := parseMessageParams(msg, &subCmd); err != nil {
	1310	return err
	1311	}
	1312	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	1313	return err
	1314	}
[107]	1315	case "PING":
[412]	1316	var source, destination string
	1317	if err := parseMessageParams(msg, &source); err != nil {
	1318	return err
	1319	}
	1320	if len(msg.Params) > 1 {
	1321	destination = msg.Params[1]
	1322	}
	1323	if destination != "" && destination != dc.srv.Hostname {
	1324	return ircError{&irc.Message{
	1325	Command: irc.ERR_NOSUCHSERVER,
[413]	1326	Params: []string{dc.nick, destination, "No such server"},
[412]	1327	}}
	1328	}
[107]	1329	dc.SendMessage(&irc.Message{
	1330	Prefix: dc.srv.prefix(),
	1331	Command: "PONG",
[412]	1332	Params: []string{dc.srv.Hostname, source},
[107]	1333	})
	1334	return nil
[428]	1335	case "PONG":
	1336	if len(msg.Params) == 0 {
	1337	return newNeedMoreParamsError(msg.Command)
	1338	}
	1339	token := msg.Params[len(msg.Params)-1]
	1340	dc.handlePong(token)
[42]	1341	case "USER":
[13]	1342	return ircError{&irc.Message{
	1343	Command: irc.ERR_ALREADYREGISTERED,
[55]	1344	Params: []string{dc.nick, "You may not reregister"},
[13]	1345	}}
[42]	1346	case "NICK":
[429]	1347	var rawNick string
	1348	if err := parseMessageParams(msg, &rawNick); err != nil {
[90]	1349	return err
	1350	}
	1351
[429]	1352	nick := rawNick
[297]	1353	var upstream *upstreamConn
	1354	if dc.upstream() == nil {
	1355	uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
	1356	if err == nil { // NICK nick/network: NICK only on a specific upstream
	1357	upstream = uc
	1358	nick = unmarshaledNick
	1359	}
	1360	}
	1361
[404]	1362	if strings.ContainsAny(nick, illegalNickChars) {
	1363	return ircError{&irc.Message{
	1364	Command: irc.ERR_ERRONEUSNICKNAME,
[430]	1365	Params: []string{dc.nick, rawNick, "contains illegal characters"},
[404]	1366	}}
	1367	}
[478]	1368	if casemapASCII(nick) == serviceNickCM {
[429]	1369	return ircError{&irc.Message{
	1370	Command: irc.ERR_NICKNAMEINUSE,
	1371	Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
	1372	}}
	1373	}
[404]	1374
[90]	1375	var err error
	1376	dc.forEachNetwork(func(n *network) {
[297]	1377	if err != nil \|\| (upstream != nil && upstream.network != n) {
[90]	1378	return
	1379	}
	1380	n.Nick = nick
[421]	1381	err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
[90]	1382	})
	1383	if err != nil {
	1384	return err
	1385	}
	1386
[73]	1387	dc.forEachUpstream(func(uc *upstreamConn) {
[297]	1388	if upstream != nil && upstream != uc {
	1389	return
	1390	}
[301]	1391	uc.SendMessageLabeled(dc.id, &irc.Message{
[297]	1392	Command: "NICK",
	1393	Params: []string{nick},
	1394	})
[42]	1395	})
[296]	1396
[512]	1397	if dc.upstream() == nil && upstream == nil && dc.nick != nick {
[296]	1398	dc.SendMessage(&irc.Message{
	1399	Prefix: dc.prefix(),
	1400	Command: "NICK",
	1401	Params: []string{nick},
	1402	})
	1403	dc.nick = nick
[478]	1404	dc.nickCM = casemapASCII(dc.nick)
[296]	1405	}
[540]	1406	case "SETNAME":
	1407	var realname string
	1408	if err := parseMessageParams(msg, &realname); err != nil {
	1409	return err
	1410	}
	1411
[568]	1412	// If the client just resets to the default, just wipe the per-network
	1413	// preference
	1414	storeRealname := realname
	1415	if realname == dc.user.Realname {
	1416	storeRealname = ""
	1417	}
	1418
[540]	1419	var storeErr error
	1420	var needUpdate []Network
	1421	dc.forEachNetwork(func(n *network) {
	1422	// We only need to call updateNetwork for upstreams that don't
	1423	// support setname
	1424	if uc := n.conn; uc != nil && uc.caps["setname"] {
	1425	uc.SendMessageLabeled(dc.id, &irc.Message{
	1426	Command: "SETNAME",
	1427	Params: []string{realname},
	1428	})
	1429
[568]	1430	n.Realname = storeRealname
[540]	1431	if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
	1432	dc.logger.Printf("failed to store network realname: %v", err)
	1433	storeErr = err
	1434	}
	1435	return
	1436	}
	1437
	1438	record := n.Network // copy network record because we'll mutate it
[568]	1439	record.Realname = storeRealname
[540]	1440	needUpdate = append(needUpdate, record)
	1441	})
	1442
	1443	// Walk the network list as a second step, because updateNetwork
	1444	// mutates the original list
	1445	for _, record := range needUpdate {
	1446	if _, err := dc.user.updateNetwork(&record); err != nil {
	1447	dc.logger.Printf("failed to update network realname: %v", err)
	1448	storeErr = err
	1449	}
	1450	}
	1451	if storeErr != nil {
	1452	return ircError{&irc.Message{
	1453	Command: "FAIL",
	1454	Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
	1455	}}
	1456	}
	1457
	1458	if dc.upstream() == nil && dc.caps["setname"] {
	1459	dc.SendMessage(&irc.Message{
	1460	Prefix: dc.prefix(),
	1461	Command: "SETNAME",
	1462	Params: []string{realname},
	1463	})
	1464	}
[146]	1465	case "JOIN":
	1466	var namesStr string
	1467	if err := parseMessageParams(msg, &namesStr); err != nil {
[48]	1468	return err
	1469	}
	1470
[146]	1471	var keys []string
	1472	if len(msg.Params) > 1 {
	1473	keys = strings.Split(msg.Params[1], ",")
	1474	}
	1475
	1476	for i, name := range strings.Split(namesStr, ",") {
[145]	1477	uc, upstreamName, err := dc.unmarshalEntity(name)
	1478	if err != nil {
[158]	1479	return err
[145]	1480	}
[48]	1481
[146]	1482	var key string
	1483	if len(keys) > i {
	1484	key = keys[i]
	1485	}
	1486
[545]	1487	if !uc.isChannel(upstreamName) {
	1488	dc.SendMessage(&irc.Message{
	1489	Prefix: dc.srv.prefix(),
	1490	Command: irc.ERR_NOSUCHCHANNEL,
	1491	Params: []string{name, "Not a channel name"},
	1492	})
	1493	continue
	1494	}
	1495
[146]	1496	params := []string{upstreamName}
	1497	if key != "" {
	1498	params = append(params, key)
	1499	}
[301]	1500	uc.SendMessageLabeled(dc.id, &irc.Message{
[146]	1501	Command: "JOIN",
	1502	Params: params,
[145]	1503	})
[89]	1504
[478]	1505	ch := uc.network.channels.Value(upstreamName)
	1506	if ch != nil {
[285]	1507	// Don't clear the channel key if there's one set
	1508	// TODO: add a way to unset the channel key
[435]	1509	if key != "" {
	1510	ch.Key = key
	1511	}
	1512	uc.network.attach(ch)
	1513	} else {
	1514	ch = &Channel{
	1515	Name: upstreamName,
	1516	Key: key,
	1517	}
[478]	1518	uc.network.channels.SetValue(upstreamName, ch)
[285]	1519	}
[435]	1520	if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
[222]	1521	dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
[89]	1522	}
	1523	}
[146]	1524	case "PART":
	1525	var namesStr string
	1526	if err := parseMessageParams(msg, &namesStr); err != nil {
	1527	return err
	1528	}
	1529
	1530	var reason string
	1531	if len(msg.Params) > 1 {
	1532	reason = msg.Params[1]
	1533	}
	1534
	1535	for _, name := range strings.Split(namesStr, ",") {
	1536	uc, upstreamName, err := dc.unmarshalEntity(name)
	1537	if err != nil {
[158]	1538	return err
[146]	1539	}
	1540
[284]	1541	if strings.EqualFold(reason, "detach") {
[478]	1542	ch := uc.network.channels.Value(upstreamName)
	1543	if ch != nil {
[435]	1544	uc.network.detach(ch)
	1545	} else {
	1546	ch = &Channel{
	1547	Name: name,
	1548	Detached: true,
	1549	}
[478]	1550	uc.network.channels.SetValue(upstreamName, ch)
[284]	1551	}
[435]	1552	if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
	1553	dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
	1554	}
[284]	1555	} else {
	1556	params := []string{upstreamName}
	1557	if reason != "" {
	1558	params = append(params, reason)
	1559	}
[301]	1560	uc.SendMessageLabeled(dc.id, &irc.Message{
[284]	1561	Command: "PART",
	1562	Params: params,
	1563	})
[146]	1564
[284]	1565	if err := uc.network.deleteChannel(upstreamName); err != nil {
	1566	dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
	1567	}
[146]	1568	}
	1569	}
[159]	1570	case "KICK":
	1571	var channelStr, userStr string
	1572	if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
	1573	return err
	1574	}
	1575
	1576	channels := strings.Split(channelStr, ",")
	1577	users := strings.Split(userStr, ",")
	1578
	1579	var reason string
	1580	if len(msg.Params) > 2 {
	1581	reason = msg.Params[2]
	1582	}
	1583
	1584	if len(channels) != 1 && len(channels) != len(users) {
	1585	return ircError{&irc.Message{
	1586	Command: irc.ERR_BADCHANMASK,
	1587	Params: []string{dc.nick, channelStr, "Bad channel mask"},
	1588	}}
	1589	}
	1590
	1591	for i, user := range users {
	1592	var channel string
	1593	if len(channels) == 1 {
	1594	channel = channels[0]
	1595	} else {
	1596	channel = channels[i]
	1597	}
	1598
	1599	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	1600	if err != nil {
	1601	return err
	1602	}
	1603
	1604	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	1605	if err != nil {
	1606	return err
	1607	}
	1608
	1609	if ucChannel != ucUser {
	1610	return ircError{&irc.Message{
	1611	Command: irc.ERR_USERNOTINCHANNEL,
[400]	1612	Params: []string{dc.nick, user, channel, "They are on another network"},
[159]	1613	}}
	1614	}
	1615	uc := ucChannel
	1616
	1617	params := []string{upstreamChannel, upstreamUser}
	1618	if reason != "" {
	1619	params = append(params, reason)
	1620	}
[301]	1621	uc.SendMessageLabeled(dc.id, &irc.Message{
[159]	1622	Command: "KICK",
	1623	Params: params,
	1624	})
	1625	}
[69]	1626	case "MODE":
[46]	1627	var name string
	1628	if err := parseMessageParams(msg, &name); err != nil {
	1629	return err
	1630	}
	1631
	1632	var modeStr string
	1633	if len(msg.Params) > 1 {
	1634	modeStr = msg.Params[1]
	1635	}
	1636
[478]	1637	if casemapASCII(name) == dc.nickCM {
[46]	1638	if modeStr != "" {
[554]	1639	if uc := dc.upstream(); uc != nil {
[301]	1640	uc.SendMessageLabeled(dc.id, &irc.Message{
[69]	1641	Command: "MODE",
	1642	Params: []string{uc.nick, modeStr},
	1643	})
[554]	1644	} else {
	1645	dc.SendMessage(&irc.Message{
	1646	Prefix: dc.srv.prefix(),
	1647	Command: irc.ERR_UMODEUNKNOWNFLAG,
	1648	Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
	1649	})
	1650	}
[46]	1651	} else {
[553]	1652	var userMode string
	1653	if uc := dc.upstream(); uc != nil {
	1654	userMode = string(uc.modes)
	1655	}
	1656
[55]	1657	dc.SendMessage(&irc.Message{
	1658	Prefix: dc.srv.prefix(),
[46]	1659	Command: irc.RPL_UMODEIS,
[553]	1660	Params: []string{dc.nick, userMode},
[54]	1661	})
[46]	1662	}
[139]	1663	return nil
[46]	1664	}
[139]	1665
	1666	uc, upstreamName, err := dc.unmarshalEntity(name)
	1667	if err != nil {
	1668	return err
	1669	}
	1670
	1671	if !uc.isChannel(upstreamName) {
	1672	return ircError{&irc.Message{
	1673	Command: irc.ERR_USERSDONTMATCH,
	1674	Params: []string{dc.nick, "Cannot change mode for other users"},
	1675	}}
	1676	}
	1677
	1678	if modeStr != "" {
	1679	params := []string{upstreamName, modeStr}
	1680	params = append(params, msg.Params[2:]...)
[301]	1681	uc.SendMessageLabeled(dc.id, &irc.Message{
[139]	1682	Command: "MODE",
	1683	Params: params,
	1684	})
	1685	} else {
[478]	1686	ch := uc.channels.Value(upstreamName)
	1687	if ch == nil {
[139]	1688	return ircError{&irc.Message{
	1689	Command: irc.ERR_NOSUCHCHANNEL,
	1690	Params: []string{dc.nick, name, "No such channel"},
	1691	}}
	1692	}
	1693
	1694	if ch.modes == nil {
	1695	// we haven't received the initial RPL_CHANNELMODEIS yet
	1696	// ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
	1697	return nil
	1698	}
	1699
	1700	modeStr, modeParams := ch.modes.Format()
	1701	params := []string{dc.nick, name, modeStr}
	1702	params = append(params, modeParams...)
	1703
	1704	dc.SendMessage(&irc.Message{
	1705	Prefix: dc.srv.prefix(),
	1706	Command: irc.RPL_CHANNELMODEIS,
	1707	Params: params,
	1708	})
[162]	1709	if ch.creationTime != "" {
	1710	dc.SendMessage(&irc.Message{
	1711	Prefix: dc.srv.prefix(),
	1712	Command: rpl_creationtime,
	1713	Params: []string{dc.nick, name, ch.creationTime},
	1714	})
	1715	}
[139]	1716	}
[160]	1717	case "TOPIC":
	1718	var channel string
	1719	if err := parseMessageParams(msg, &channel); err != nil {
	1720	return err
	1721	}
	1722
[478]	1723	uc, upstreamName, err := dc.unmarshalEntity(channel)
[160]	1724	if err != nil {
	1725	return err
	1726	}
	1727
	1728	if len(msg.Params) > 1 { // setting topic
	1729	topic := msg.Params[1]
[301]	1730	uc.SendMessageLabeled(dc.id, &irc.Message{
[160]	1731	Command: "TOPIC",
[478]	1732	Params: []string{upstreamName, topic},
[160]	1733	})
	1734	} else { // getting topic
[478]	1735	ch := uc.channels.Value(upstreamName)
	1736	if ch == nil {
[160]	1737	return ircError{&irc.Message{
	1738	Command: irc.ERR_NOSUCHCHANNEL,
[478]	1739	Params: []string{dc.nick, upstreamName, "No such channel"},
[160]	1740	}}
	1741	}
	1742	sendTopic(dc, ch)
	1743	}
[177]	1744	case "LIST":
	1745	// TODO: support ELIST when supported by all upstreams
	1746
	1747	pl := pendingLIST{
	1748	downstreamID: dc.id,
	1749	pendingCommands: make(map[int64]*irc.Message),
	1750	}
[298]	1751	var upstream *upstreamConn
[177]	1752	var upstreamChannels map[int64][]string
	1753	if len(msg.Params) > 0 {
[298]	1754	uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
	1755	if err == nil && upstreamMask == "" { // LIST /network: send LIST only to one network
	1756	upstream = uc
	1757	} else {
	1758	upstreamChannels = make(map[int64][]string)
	1759	channels := strings.Split(msg.Params[0], ",")
	1760	for _, channel := range channels {
	1761	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	1762	if err != nil {
	1763	return err
	1764	}
	1765	upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
[177]	1766	}
	1767	}
	1768	}
	1769
	1770	dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
	1771	dc.forEachUpstream(func(uc *upstreamConn) {
[298]	1772	if upstream != nil && upstream != uc {
	1773	return
	1774	}
[177]	1775	var params []string
	1776	if upstreamChannels != nil {
	1777	if channels, ok := upstreamChannels[uc.network.ID]; ok {
	1778	params = []string{strings.Join(channels, ",")}
	1779	} else {
	1780	return
	1781	}
	1782	}
	1783	pl.pendingCommands[uc.network.ID] = &irc.Message{
	1784	Command: "LIST",
	1785	Params: params,
	1786	}
[181]	1787	uc.trySendLIST(dc.id)
[177]	1788	})
[140]	1789	case "NAMES":
	1790	if len(msg.Params) == 0 {
	1791	dc.SendMessage(&irc.Message{
	1792	Prefix: dc.srv.prefix(),
	1793	Command: irc.RPL_ENDOFNAMES,
	1794	Params: []string{dc.nick, "*", "End of /NAMES list"},
	1795	})
	1796	return nil
	1797	}
	1798
	1799	channels := strings.Split(msg.Params[0], ",")
	1800	for _, channel := range channels {
[478]	1801	uc, upstreamName, err := dc.unmarshalEntity(channel)
[140]	1802	if err != nil {
	1803	return err
	1804	}
	1805
[478]	1806	ch := uc.channels.Value(upstreamName)
	1807	if ch != nil {
[140]	1808	sendNames(dc, ch)
	1809	} else {
	1810	// NAMES on a channel we have not joined, ask upstream
[176]	1811	uc.SendMessageLabeled(dc.id, &irc.Message{
[140]	1812	Command: "NAMES",
[478]	1813	Params: []string{upstreamName},
[140]	1814	})
	1815	}
	1816	}
[127]	1817	case "WHO":
	1818	if len(msg.Params) == 0 {
	1819	// TODO: support WHO without parameters
	1820	dc.SendMessage(&irc.Message{
	1821	Prefix: dc.srv.prefix(),
	1822	Command: irc.RPL_ENDOFWHO,
[140]	1823	Params: []string{dc.nick, "*", "End of /WHO list"},
[127]	1824	})
	1825	return nil
	1826	}
	1827
	1828	// TODO: support WHO masks
	1829	entity := msg.Params[0]
[478]	1830	entityCM := casemapASCII(entity)
[127]	1831
[520]	1832	if dc.network == nil && entityCM == dc.nickCM {
[142]	1833	// TODO: support AWAY (H/G) in self WHO reply
	1834	dc.SendMessage(&irc.Message{
	1835	Prefix: dc.srv.prefix(),
	1836	Command: irc.RPL_WHOREPLY,
[184]	1837	Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
[142]	1838	})
	1839	dc.SendMessage(&irc.Message{
	1840	Prefix: dc.srv.prefix(),
	1841	Command: irc.RPL_ENDOFWHO,
	1842	Params: []string{dc.nick, dc.nick, "End of /WHO list"},
	1843	})
	1844	return nil
	1845	}
[478]	1846	if entityCM == serviceNickCM {
[343]	1847	dc.SendMessage(&irc.Message{
	1848	Prefix: dc.srv.prefix(),
	1849	Command: irc.RPL_WHOREPLY,
	1850	Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
	1851	})
	1852	dc.SendMessage(&irc.Message{
	1853	Prefix: dc.srv.prefix(),
	1854	Command: irc.RPL_ENDOFWHO,
	1855	Params: []string{dc.nick, serviceNick, "End of /WHO list"},
	1856	})
	1857	return nil
	1858	}
[142]	1859
[127]	1860	uc, upstreamName, err := dc.unmarshalEntity(entity)
	1861	if err != nil {
	1862	return err
	1863	}
	1864
	1865	var params []string
	1866	if len(msg.Params) == 2 {
	1867	params = []string{upstreamName, msg.Params[1]}
	1868	} else {
	1869	params = []string{upstreamName}
	1870	}
	1871
[176]	1872	uc.SendMessageLabeled(dc.id, &irc.Message{
[127]	1873	Command: "WHO",
	1874	Params: params,
	1875	})
[128]	1876	case "WHOIS":
	1877	if len(msg.Params) == 0 {
	1878	return ircError{&irc.Message{
	1879	Command: irc.ERR_NONICKNAMEGIVEN,
	1880	Params: []string{dc.nick, "No nickname given"},
	1881	}}
	1882	}
	1883
	1884	var target, mask string
	1885	if len(msg.Params) == 1 {
	1886	target = ""
	1887	mask = msg.Params[0]
	1888	} else {
	1889	target = msg.Params[0]
	1890	mask = msg.Params[1]
	1891	}
	1892	// TODO: support multiple WHOIS users
	1893	if i := strings.IndexByte(mask, ','); i >= 0 {
	1894	mask = mask[:i]
	1895	}
	1896
[520]	1897	if dc.network == nil && casemapASCII(mask) == dc.nickCM {
[142]	1898	dc.SendMessage(&irc.Message{
	1899	Prefix: dc.srv.prefix(),
	1900	Command: irc.RPL_WHOISUSER,
[184]	1901	Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
[142]	1902	})
	1903	dc.SendMessage(&irc.Message{
	1904	Prefix: dc.srv.prefix(),
	1905	Command: irc.RPL_WHOISSERVER,
	1906	Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
	1907	})
	1908	dc.SendMessage(&irc.Message{
	1909	Prefix: dc.srv.prefix(),
	1910	Command: irc.RPL_ENDOFWHOIS,
	1911	Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
	1912	})
	1913	return nil
	1914	}
[609]	1915	if casemapASCII(mask) == serviceNickCM {
	1916	dc.SendMessage(&irc.Message{
	1917	Prefix: dc.srv.prefix(),
	1918	Command: irc.RPL_WHOISUSER,
	1919	Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
	1920	})
	1921	dc.SendMessage(&irc.Message{
	1922	Prefix: dc.srv.prefix(),
	1923	Command: irc.RPL_WHOISSERVER,
	1924	Params: []string{dc.nick, serviceNick, dc.srv.Hostname, "soju"},
	1925	})
	1926	dc.SendMessage(&irc.Message{
	1927	Prefix: dc.srv.prefix(),
	1928	Command: irc.RPL_ENDOFWHOIS,
	1929	Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
	1930	})
	1931	return nil
	1932	}
[142]	1933
[128]	1934	// TODO: support WHOIS masks
	1935	uc, upstreamNick, err := dc.unmarshalEntity(mask)
	1936	if err != nil {
	1937	return err
	1938	}
	1939
	1940	var params []string
	1941	if target != "" {
[299]	1942	if target == mask { // WHOIS nick nick
	1943	params = []string{upstreamNick, upstreamNick}
	1944	} else {
	1945	params = []string{target, upstreamNick}
	1946	}
[128]	1947	} else {
	1948	params = []string{upstreamNick}
	1949	}
	1950
[176]	1951	uc.SendMessageLabeled(dc.id, &irc.Message{
[128]	1952	Command: "WHOIS",
	1953	Params: params,
	1954	})
[562]	1955	case "PRIVMSG", "NOTICE":
[58]	1956	var targetsStr, text string
	1957	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	1958	return err
	1959	}
[303]	1960	tags := copyClientTags(msg.Tags)
[58]	1961
	1962	for _, name := range strings.Split(targetsStr, ",") {
[563]	1963	if name == "$"+dc.srv.Hostname \|\| (name == "$*" && dc.network == nil) {
	1964	// "$" means a server mask follows. If it's the bouncer's
	1965	// hostname, broadcast the message to all bouncer users.
	1966	if !dc.user.Admin {
	1967	return ircError{&irc.Message{
	1968	Prefix: dc.srv.prefix(),
	1969	Command: irc.ERR_BADMASK,
	1970	Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
	1971	}}
	1972	}
	1973
	1974	dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
	1975
	1976	broadcastTags := tags.Copy()
	1977	broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
	1978	broadcastMsg := &irc.Message{
	1979	Tags: broadcastTags,
	1980	Prefix: servicePrefix,
	1981	Command: msg.Command,
	1982	Params: []string{name, text},
	1983	}
	1984	dc.srv.forEachUser(func(u *user) {
	1985	u.events <- eventBroadcast{broadcastMsg}
	1986	})
	1987	continue
	1988	}
	1989
[529]	1990	if dc.network == nil && casemapASCII(name) == dc.nickCM {
[618]	1991	dc.SendMessage(&irc.Message{
	1992	Tags: msg.Tags.Copy(),
	1993	Prefix: dc.prefix(),
	1994	Command: msg.Command,
	1995	Params: []string{name, text},
	1996	})
[529]	1997	continue
	1998	}
	1999
[562]	2000	if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
[431]	2001	if dc.caps["echo-message"] {
	2002	echoTags := tags.Copy()
	2003	echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
	2004	dc.SendMessage(&irc.Message{
	2005	Tags: echoTags,
	2006	Prefix: dc.prefix(),
[562]	2007	Command: msg.Command,
[431]	2008	Params: []string{name, text},
	2009	})
	2010	}
[117]	2011	handleServicePRIVMSG(dc, text)
	2012	continue
	2013	}
	2014
[127]	2015	uc, upstreamName, err := dc.unmarshalEntity(name)
[58]	2016	if err != nil {
	2017	return err
	2018	}
	2019
[562]	2020	if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
[95]	2021	dc.handleNickServPRIVMSG(uc, text)
	2022	}
	2023
[268]	2024	unmarshaledText := text
	2025	if uc.isChannel(upstreamName) {
	2026	unmarshaledText = dc.unmarshalText(uc, text)
	2027	}
[301]	2028	uc.SendMessageLabeled(dc.id, &irc.Message{
[303]	2029	Tags: tags,
[562]	2030	Command: msg.Command,
[268]	2031	Params: []string{upstreamName, unmarshaledText},
[60]	2032	})
[105]	2033
[303]	2034	echoTags := tags.Copy()
	2035	echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[559]	2036	if uc.account != "" {
	2037	echoTags["account"] = irc.TagValue(uc.account)
	2038	}
[113]	2039	echoMsg := &irc.Message{
[303]	2040	Tags: echoTags,
[113]	2041	Prefix: &irc.Prefix{
	2042	Name: uc.nick,
	2043	User: uc.username,
	2044	},
[562]	2045	Command: msg.Command,
[113]	2046	Params: []string{upstreamName, text},
	2047	}
[239]	2048	uc.produce(upstreamName, echoMsg, dc)
[435]	2049
	2050	uc.updateChannelAutoDetach(upstreamName)
[58]	2051	}
[303]	2052	case "TAGMSG":
	2053	var targetsStr string
	2054	if err := parseMessageParams(msg, &targetsStr); err != nil {
	2055	return err
	2056	}
	2057	tags := copyClientTags(msg.Tags)
	2058
	2059	for _, name := range strings.Split(targetsStr, ",") {
[617]	2060	if dc.network == nil && casemapASCII(name) == dc.nickCM {
	2061	dc.SendMessage(&irc.Message{
	2062	Tags: msg.Tags.Copy(),
	2063	Prefix: dc.prefix(),
	2064	Command: "TAGMSG",
	2065	Params: []string{name},
	2066	})
	2067	continue
	2068	}
	2069
[616]	2070	if casemapASCII(name) == serviceNickCM {
	2071	continue
	2072	}
	2073
[303]	2074	uc, upstreamName, err := dc.unmarshalEntity(name)
	2075	if err != nil {
	2076	return err
	2077	}
[427]	2078	if _, ok := uc.caps["message-tags"]; !ok {
	2079	continue
	2080	}
[303]	2081
	2082	uc.SendMessageLabeled(dc.id, &irc.Message{
	2083	Tags: tags,
	2084	Command: "TAGMSG",
	2085	Params: []string{upstreamName},
	2086	})
[435]	2087
	2088	uc.updateChannelAutoDetach(upstreamName)
[303]	2089	}
[163]	2090	case "INVITE":
	2091	var user, channel string
	2092	if err := parseMessageParams(msg, &user, &channel); err != nil {
	2093	return err
	2094	}
	2095
	2096	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	2097	if err != nil {
	2098	return err
	2099	}
	2100
	2101	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	2102	if err != nil {
	2103	return err
	2104	}
	2105
	2106	if ucChannel != ucUser {
	2107	return ircError{&irc.Message{
	2108	Command: irc.ERR_USERNOTINCHANNEL,
[401]	2109	Params: []string{dc.nick, user, channel, "They are on another network"},
[163]	2110	}}
	2111	}
	2112	uc := ucChannel
	2113
[176]	2114	uc.SendMessageLabeled(dc.id, &irc.Message{
[163]	2115	Command: "INVITE",
	2116	Params: []string{upstreamUser, upstreamChannel},
	2117	})
[319]	2118	case "CHATHISTORY":
	2119	var subcommand string
	2120	if err := parseMessageParams(msg, &subcommand); err != nil {
	2121	return err
	2122	}
[516]	2123	var target, limitStr string
	2124	var boundsStr [2]string
	2125	switch subcommand {
	2126	case "AFTER", "BEFORE":
	2127	if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
	2128	return err
	2129	}
	2130	case "BETWEEN":
	2131	if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
	2132	return err
	2133	}
[549]	2134	case "TARGETS":
	2135	if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
	2136	return err
	2137	}
[516]	2138	default:
	2139	// TODO: support LATEST, AROUND
[319]	2140	return ircError{&irc.Message{
	2141	Command: "FAIL",
[516]	2142	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
[319]	2143	}}
	2144	}
	2145
[586]	2146	// We don't save history for our service
	2147	if casemapASCII(target) == serviceNickCM {
	2148	dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
	2149	return nil
	2150	}
	2151
[441]	2152	store, ok := dc.user.msgStore.(chatHistoryMessageStore)
	2153	if !ok {
[319]	2154	return ircError{&irc.Message{
	2155	Command: irc.ERR_UNKNOWNCOMMAND,
[456]	2156	Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
[319]	2157	}}
	2158	}
	2159
[585]	2160	network, entity, err := dc.unmarshalEntityNetwork(target)
[319]	2161	if err != nil {
	2162	return err
	2163	}
[585]	2164	entity = network.casemap(entity)
[319]	2165
	2166	// TODO: support msgid criteria
[516]	2167	var bounds [2]time.Time
	2168	bounds[0] = parseChatHistoryBound(boundsStr[0])
	2169	if bounds[0].IsZero() {
[319]	2170	return ircError{&irc.Message{
	2171	Command: "FAIL",
[516]	2172	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
[319]	2173	}}
	2174	}
	2175
[516]	2176	if boundsStr[1] != "" {
	2177	bounds[1] = parseChatHistoryBound(boundsStr[1])
	2178	if bounds[1].IsZero() {
	2179	return ircError{&irc.Message{
	2180	Command: "FAIL",
	2181	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
	2182	}}
	2183	}
[319]	2184	}
	2185
	2186	limit, err := strconv.Atoi(limitStr)
	2187	if err != nil \|\| limit < 0 \|\| limit > dc.srv.HistoryLimit {
	2188	return ircError{&irc.Message{
	2189	Command: "FAIL",
[456]	2190	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
[319]	2191	}}
	2192	}
	2193
[387]	2194	var history []*irc.Message
[319]	2195	switch subcommand {
	2196	case "BEFORE":
[585]	2197	history, err = store.LoadBeforeTime(network, entity, bounds[0], time.Time{}, limit)
[360]	2198	case "AFTER":
[585]	2199	history, err = store.LoadAfterTime(network, entity, bounds[0], time.Now(), limit)
[516]	2200	case "BETWEEN":
	2201	if bounds[0].Before(bounds[1]) {
[585]	2202	history, err = store.LoadAfterTime(network, entity, bounds[0], bounds[1], limit)
[516]	2203	} else {
[585]	2204	history, err = store.LoadBeforeTime(network, entity, bounds[0], bounds[1], limit)
[516]	2205	}
[549]	2206	case "TARGETS":
	2207	// TODO: support TARGETS in multi-upstream mode
[585]	2208	targets, err := store.ListTargets(network, bounds[0], bounds[1], limit)
[549]	2209	if err != nil {
[627]	2210	dc.logger.Printf("failed fetching targets for chathistory: %v", err)
[549]	2211	return ircError{&irc.Message{
	2212	Command: "FAIL",
	2213	Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
	2214	}}
	2215	}
	2216
[551]	2217	dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
	2218	for _, target := range targets {
[585]	2219	if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
[551]	2220	continue
	2221	}
[549]	2222
[551]	2223	dc.SendMessage(&irc.Message{
	2224	Tags: irc.Tags{"batch": batchRef},
	2225	Prefix: dc.srv.prefix(),
	2226	Command: "CHATHISTORY",
	2227	Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
	2228	})
[550]	2229	}
[549]	2230	})
	2231
	2232	return nil
[319]	2233	}
[387]	2234	if err != nil {
[515]	2235	dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
[387]	2236	return newChatHistoryError(subcommand, target)
	2237	}
	2238
[551]	2239	dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
	2240	for _, msg := range history {
	2241	msg.Tags["batch"] = batchRef
[585]	2242	dc.SendMessage(dc.marshalMessage(msg, network))
[551]	2243	}
[387]	2244	})
[532]	2245	case "BOUNCER":
	2246	var subcommand string
	2247	if err := parseMessageParams(msg, &subcommand); err != nil {
	2248	return err
	2249	}
	2250
	2251	switch strings.ToUpper(subcommand) {
	2252	case "LISTNETWORKS":
[551]	2253	dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
	2254	dc.user.forEachNetwork(func(network *network) {
	2255	idStr := fmt.Sprintf("%v", network.ID)
	2256	attrs := getNetworkAttrs(network)
	2257	dc.SendMessage(&irc.Message{
	2258	Tags: irc.Tags{"batch": batchRef},
	2259	Prefix: dc.srv.prefix(),
	2260	Command: "BOUNCER",
	2261	Params: []string{"NETWORK", idStr, attrs.String()},
	2262	})
[532]	2263	})
	2264	})
	2265	case "ADDNETWORK":
	2266	var attrsStr string
	2267	if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
	2268	return err
	2269	}
	2270	attrs := irc.ParseTags(attrsStr)
	2271
	2272	host, ok := attrs.GetTag("host")
	2273	if !ok {
	2274	return ircError{&irc.Message{
	2275	Command: "FAIL",
	2276	Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
	2277	}}
	2278	}
	2279
	2280	addr := host
	2281	if port, ok := attrs.GetTag("port"); ok {
	2282	addr += ":" + port
	2283	}
	2284
	2285	if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
	2286	addr = "irc+insecure://" + tlsStr
	2287	}
	2288
	2289	nick, ok := attrs.GetTag("nickname")
	2290	if !ok {
	2291	nick = dc.nick
	2292	}
	2293
	2294	username, _ := attrs.GetTag("username")
	2295	realname, _ := attrs.GetTag("realname")
[533]	2296	pass, _ := attrs.GetTag("pass")
[532]	2297
[568]	2298	if realname == dc.user.Realname {
	2299	realname = ""
	2300	}
	2301
[532]	2302	// TODO: reject unknown attributes
	2303
	2304	record := &Network{
	2305	Addr: addr,
	2306	Nick: nick,
	2307	Username: username,
	2308	Realname: realname,
[533]	2309	Pass: pass,
[542]	2310	Enabled: true,
[532]	2311	}
	2312	network, err := dc.user.createNetwork(record)
	2313	if err != nil {
	2314	return ircError{&irc.Message{
	2315	Command: "FAIL",
	2316	Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
	2317	}}
	2318	}
	2319
	2320	dc.SendMessage(&irc.Message{
	2321	Prefix: dc.srv.prefix(),
	2322	Command: "BOUNCER",
	2323	Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
	2324	})
	2325	case "CHANGENETWORK":
	2326	var idStr, attrsStr string
	2327	if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
	2328	return err
	2329	}
[535]	2330	id, err := parseBouncerNetID(subcommand, idStr)
[532]	2331	if err != nil {
	2332	return err
	2333	}
	2334	attrs := irc.ParseTags(attrsStr)
	2335
	2336	net := dc.user.getNetworkByID(id)
	2337	if net == nil {
	2338	return ircError{&irc.Message{
	2339	Command: "FAIL",
[535]	2340	Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
[532]	2341	}}
	2342	}
	2343
	2344	record := net.Network // copy network record because we'll mutate it
	2345	for k, v := range attrs {
	2346	s := string(v)
	2347	switch k {
	2348	// TODO: host, port, tls
	2349	case "nickname":
	2350	record.Nick = s
	2351	case "username":
	2352	record.Username = s
	2353	case "realname":
	2354	record.Realname = s
[533]	2355	case "pass":
	2356	record.Pass = s
[532]	2357	default:
	2358	return ircError{&irc.Message{
	2359	Command: "FAIL",
	2360	Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
	2361	}}
	2362	}
	2363	}
	2364
	2365	_, err = dc.user.updateNetwork(&record)
	2366	if err != nil {
	2367	return ircError{&irc.Message{
	2368	Command: "FAIL",
	2369	Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
	2370	}}
	2371	}
	2372
	2373	dc.SendMessage(&irc.Message{
	2374	Prefix: dc.srv.prefix(),
	2375	Command: "BOUNCER",
	2376	Params: []string{"CHANGENETWORK", idStr},
	2377	})
	2378	case "DELNETWORK":
	2379	var idStr string
	2380	if err := parseMessageParams(msg, nil, &idStr); err != nil {
	2381	return err
	2382	}
[535]	2383	id, err := parseBouncerNetID(subcommand, idStr)
[532]	2384	if err != nil {
	2385	return err
	2386	}
	2387
	2388	net := dc.user.getNetworkByID(id)
	2389	if net == nil {
	2390	return ircError{&irc.Message{
	2391	Command: "FAIL",
[535]	2392	Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
[532]	2393	}}
	2394	}
	2395
	2396	if err := dc.user.deleteNetwork(net.ID); err != nil {
	2397	return err
	2398	}
	2399
	2400	dc.SendMessage(&irc.Message{
	2401	Prefix: dc.srv.prefix(),
	2402	Command: "BOUNCER",
	2403	Params: []string{"DELNETWORK", idStr},
	2404	})
	2405	default:
	2406	return ircError{&irc.Message{
	2407	Command: "FAIL",
	2408	Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
	2409	}}
	2410	}
[13]	2411	default:
[55]	2412	dc.logger.Printf("unhandled message: %v", msg)
[547]	2413
	2414	// Only forward unknown commands in single-upstream mode
	2415	uc := dc.upstream()
	2416	if uc == nil {
	2417	return newUnknownCommandError(msg.Command)
	2418	}
	2419
	2420	uc.SendMessageLabeled(dc.id, msg)
[13]	2421	}
[42]	2422	return nil
[13]	2423	}
[95]	2424
	2425	func (dc downstreamConn) handleNickServPRIVMSG(uc upstreamConn, text string) {
	2426	username, password, ok := parseNickServCredentials(text, uc.nick)
	2427	if !ok {
	2428	return
	2429	}
	2430
[307]	2431	// User may have e.g. EXTERNAL mechanism configured. We do not want to
	2432	// automatically erase the key pair or any other credentials.
	2433	if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
	2434	return
	2435	}
	2436
[95]	2437	dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
	2438	n := uc.network
	2439	n.SASL.Mechanism = "PLAIN"
	2440	n.SASL.Plain.Username = username
	2441	n.SASL.Plain.Password = password
[421]	2442	if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
[95]	2443	dc.logger.Printf("failed to save NickServ credentials: %v", err)
	2444	}
	2445	}
	2446
	2447	func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
	2448	fields := strings.Fields(text)
	2449	if len(fields) < 2 {
	2450	return "", "", false
	2451	}
	2452	cmd := strings.ToUpper(fields[0])
	2453	params := fields[1:]
	2454	switch cmd {
	2455	case "REGISTER":
	2456	username = nick
	2457	password = params[0]
	2458	case "IDENTIFY":
	2459	if len(params) == 1 {
	2460	username = nick
[182]	2461	password = params[0]
[95]	2462	} else {
	2463	username = params[0]
[182]	2464	password = params[1]
[95]	2465	}
[182]	2466	case "SET":
	2467	if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
	2468	username = nick
	2469	password = params[1]
	2470	}
[340]	2471	default:
	2472	return "", "", false
[95]	2473	}
	2474	return username, password, true
	2475	}

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