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source: code/trunk/downstream.go@ 634

Last change on this file since 634 was 629, checked in by contact, 4 years ago

Stop sending RPL_CREATED

There's no point in sending this numeric if it doesn't contain any
useful info.

File size: 61.8 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	}
[555]	1122	motdHint := "No MOTD"
[553]	1123	if uc := dc.upstream(); uc != nil {
[555]	1124	motdHint = "Use /motd to read the message of the day"
[553]	1125	dc.SendMessage(&irc.Message{
	1126	Prefix: dc.srv.prefix(),
	1127	Command: irc.RPL_UMODEIS,
	1128	Params: []string{dc.nick, string(uc.modes)},
	1129	})
	1130	}
[55]	1131	dc.SendMessage(&irc.Message{
[447]	1132	Prefix: dc.srv.prefix(),
[13]	1133	Command: irc.ERR_NOMOTD,
[555]	1134	Params: []string{dc.nick, motdHint},
[54]	1135	})
[13]	1136
[296]	1137	dc.updateNick()
[540]	1138	dc.updateRealname()
[437]	1139	dc.updateSupportedCaps()
[296]	1140
[535]	1141	if dc.caps["soju.im/bouncer-networks-notify"] {
[551]	1142	dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
	1143	dc.user.forEachNetwork(func(network *network) {
	1144	idStr := fmt.Sprintf("%v", network.ID)
	1145	attrs := getNetworkAttrs(network)
	1146	dc.SendMessage(&irc.Message{
	1147	Tags: irc.Tags{"batch": batchRef},
	1148	Prefix: dc.srv.prefix(),
	1149	Command: "BOUNCER",
	1150	Params: []string{"NETWORK", idStr, attrs.String()},
	1151	})
[535]	1152	})
	1153	})
	1154	}
	1155
[73]	1156	dc.forEachUpstream(func(uc *upstreamConn) {
[478]	1157	for _, entry := range uc.channels.innerMap {
	1158	ch := entry.value.(*upstreamChannel)
[284]	1159	if !ch.complete {
	1160	continue
	1161	}
[478]	1162	record := uc.network.channels.Value(ch.Name)
	1163	if record != nil && record.Detached {
[284]	1164	continue
	1165	}
[132]	1166
[284]	1167	dc.SendMessage(&irc.Message{
	1168	Prefix: dc.prefix(),
	1169	Command: "JOIN",
	1170	Params: []string{dc.marshalEntity(ch.conn.network, ch.Name)},
	1171	})
	1172
	1173	forwardChannel(dc, ch)
[30]	1174	}
[143]	1175	})
[50]	1176
[143]	1177	dc.forEachNetwork(func(net *network) {
[496]	1178	if dc.caps["draft/chathistory"] \|\| dc.user.msgStore == nil {
	1179	return
	1180	}
	1181
[253]	1182	// Only send history if we're the first connected client with that name
	1183	// for the network
[482]	1184	firstClient := true
	1185	dc.user.forEachDownstream(func(c *downstreamConn) {
	1186	if c != dc && c.clientName == dc.clientName && c.network == dc.network {
	1187	firstClient = false
	1188	}
	1189	})
	1190	if firstClient {
[485]	1191	net.delivered.ForEachTarget(func(target string) {
[495]	1192	lastDelivered := net.delivered.LoadID(target, dc.clientName)
	1193	if lastDelivered == "" {
	1194	return
	1195	}
	1196
	1197	dc.sendTargetBacklog(net, target, lastDelivered)
	1198
	1199	// Fast-forward history to last message
	1200	targetCM := net.casemap(target)
	1201	lastID, err := dc.user.msgStore.LastMsgID(net, targetCM, time.Now())
	1202	if err != nil {
	1203	dc.logger.Printf("failed to get last message ID: %v", err)
	1204	return
	1205	}
	1206	net.delivered.StoreID(target, dc.clientName, lastID)
[485]	1207	})
[227]	1208	}
[253]	1209	})
[57]	1210
[253]	1211	return nil
	1212	}
[144]	1213
[428]	1214	// messageSupportsHistory checks whether the provided message can be sent as
	1215	// part of an history batch.
	1216	func (dc downstreamConn) messageSupportsHistory(msg irc.Message) bool {
	1217	// Don't replay all messages, because that would mess up client
	1218	// state. For instance we just sent the list of users, sending
	1219	// PART messages for one of these users would be incorrect.
	1220	// TODO: add support for draft/event-playback
	1221	switch msg.Command {
	1222	case "PRIVMSG", "NOTICE":
	1223	return true
	1224	}
	1225	return false
	1226	}
	1227
[495]	1228	func (dc downstreamConn) sendTargetBacklog(net network, target, msgID string) {
[423]	1229	if dc.caps["draft/chathistory"] \|\| dc.user.msgStore == nil {
[319]	1230	return
	1231	}
[485]	1232
[499]	1233	ch := net.channels.Value(target)
	1234
[452]	1235	limit := 4000
[484]	1236	targetCM := net.casemap(target)
[495]	1237	history, err := dc.user.msgStore.LoadLatestID(net, targetCM, msgID, limit)
[452]	1238	if err != nil {
[495]	1239	dc.logger.Printf("failed to send backlog for %q: %v", target, err)
[452]	1240	return
	1241	}
[253]	1242
[551]	1243	dc.SendBatch("chathistory", []string{dc.marshalEntity(net, target)}, nil, func(batchRef irc.TagValue) {
	1244	for _, msg := range history {
	1245	if !dc.messageSupportsHistory(msg) {
	1246	continue
	1247	}
[452]	1248
[551]	1249	if ch != nil && ch.Detached {
	1250	if net.detachedMessageNeedsRelay(ch, msg) {
	1251	dc.relayDetachedMessage(net, msg)
	1252	}
	1253	} else {
	1254	if dc.caps["batch"] {
	1255	msg.Tags["batch"] = irc.TagValue(batchRef)
	1256	}
	1257	dc.SendMessage(dc.marshalMessage(msg, net))
[499]	1258	}
[256]	1259	}
[551]	1260	})
[13]	1261	}
	1262
[499]	1263	func (dc downstreamConn) relayDetachedMessage(net network, msg *irc.Message) {
	1264	if msg.Command != "PRIVMSG" && msg.Command != "NOTICE" {
	1265	return
	1266	}
	1267
	1268	sender := msg.Prefix.Name
	1269	target, text := msg.Params[0], msg.Params[1]
	1270	if net.isHighlight(msg) {
	1271	sendServiceNOTICE(dc, fmt.Sprintf("highlight in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
	1272	} else {
	1273	sendServiceNOTICE(dc, fmt.Sprintf("message in %v: <%v> %v", dc.marshalEntity(net, target), sender, text))
	1274	}
	1275	}
	1276
[103]	1277	func (dc *downstreamConn) runUntilRegistered() error {
	1278	for !dc.registered {
[212]	1279	msg, err := dc.ReadMessage()
[106]	1280	if err != nil {
[103]	1281	return fmt.Errorf("failed to read IRC command: %v", err)
	1282	}
	1283
	1284	err = dc.handleMessage(msg)
	1285	if ircErr, ok := err.(ircError); ok {
	1286	ircErr.Message.Prefix = dc.srv.prefix()
	1287	dc.SendMessage(ircErr.Message)
	1288	} else if err != nil {
	1289	return fmt.Errorf("failed to handle IRC command %q: %v", msg, err)
	1290	}
	1291	}
	1292
	1293	return nil
	1294	}
	1295
[55]	1296	func (dc downstreamConn) handleMessageRegistered(msg irc.Message) error {
[13]	1297	switch msg.Command {
[111]	1298	case "CAP":
	1299	var subCmd string
	1300	if err := parseMessageParams(msg, &subCmd); err != nil {
	1301	return err
	1302	}
	1303	if err := dc.handleCapCommand(subCmd, msg.Params[1:]); err != nil {
	1304	return err
	1305	}
[107]	1306	case "PING":
[412]	1307	var source, destination string
	1308	if err := parseMessageParams(msg, &source); err != nil {
	1309	return err
	1310	}
	1311	if len(msg.Params) > 1 {
	1312	destination = msg.Params[1]
	1313	}
	1314	if destination != "" && destination != dc.srv.Hostname {
	1315	return ircError{&irc.Message{
	1316	Command: irc.ERR_NOSUCHSERVER,
[413]	1317	Params: []string{dc.nick, destination, "No such server"},
[412]	1318	}}
	1319	}
[107]	1320	dc.SendMessage(&irc.Message{
	1321	Prefix: dc.srv.prefix(),
	1322	Command: "PONG",
[412]	1323	Params: []string{dc.srv.Hostname, source},
[107]	1324	})
	1325	return nil
[428]	1326	case "PONG":
	1327	if len(msg.Params) == 0 {
	1328	return newNeedMoreParamsError(msg.Command)
	1329	}
	1330	token := msg.Params[len(msg.Params)-1]
	1331	dc.handlePong(token)
[42]	1332	case "USER":
[13]	1333	return ircError{&irc.Message{
	1334	Command: irc.ERR_ALREADYREGISTERED,
[55]	1335	Params: []string{dc.nick, "You may not reregister"},
[13]	1336	}}
[42]	1337	case "NICK":
[429]	1338	var rawNick string
	1339	if err := parseMessageParams(msg, &rawNick); err != nil {
[90]	1340	return err
	1341	}
	1342
[429]	1343	nick := rawNick
[297]	1344	var upstream *upstreamConn
	1345	if dc.upstream() == nil {
	1346	uc, unmarshaledNick, err := dc.unmarshalEntity(nick)
	1347	if err == nil { // NICK nick/network: NICK only on a specific upstream
	1348	upstream = uc
	1349	nick = unmarshaledNick
	1350	}
	1351	}
	1352
[404]	1353	if strings.ContainsAny(nick, illegalNickChars) {
	1354	return ircError{&irc.Message{
	1355	Command: irc.ERR_ERRONEUSNICKNAME,
[430]	1356	Params: []string{dc.nick, rawNick, "contains illegal characters"},
[404]	1357	}}
	1358	}
[478]	1359	if casemapASCII(nick) == serviceNickCM {
[429]	1360	return ircError{&irc.Message{
	1361	Command: irc.ERR_NICKNAMEINUSE,
	1362	Params: []string{dc.nick, rawNick, "Nickname reserved for bouncer service"},
	1363	}}
	1364	}
[404]	1365
[90]	1366	var err error
	1367	dc.forEachNetwork(func(n *network) {
[297]	1368	if err != nil \|\| (upstream != nil && upstream.network != n) {
[90]	1369	return
	1370	}
	1371	n.Nick = nick
[421]	1372	err = dc.srv.db.StoreNetwork(dc.user.ID, &n.Network)
[90]	1373	})
	1374	if err != nil {
	1375	return err
	1376	}
	1377
[73]	1378	dc.forEachUpstream(func(uc *upstreamConn) {
[297]	1379	if upstream != nil && upstream != uc {
	1380	return
	1381	}
[301]	1382	uc.SendMessageLabeled(dc.id, &irc.Message{
[297]	1383	Command: "NICK",
	1384	Params: []string{nick},
	1385	})
[42]	1386	})
[296]	1387
[512]	1388	if dc.upstream() == nil && upstream == nil && dc.nick != nick {
[296]	1389	dc.SendMessage(&irc.Message{
	1390	Prefix: dc.prefix(),
	1391	Command: "NICK",
	1392	Params: []string{nick},
	1393	})
	1394	dc.nick = nick
[478]	1395	dc.nickCM = casemapASCII(dc.nick)
[296]	1396	}
[540]	1397	case "SETNAME":
	1398	var realname string
	1399	if err := parseMessageParams(msg, &realname); err != nil {
	1400	return err
	1401	}
	1402
[568]	1403	// If the client just resets to the default, just wipe the per-network
	1404	// preference
	1405	storeRealname := realname
	1406	if realname == dc.user.Realname {
	1407	storeRealname = ""
	1408	}
	1409
[540]	1410	var storeErr error
	1411	var needUpdate []Network
	1412	dc.forEachNetwork(func(n *network) {
	1413	// We only need to call updateNetwork for upstreams that don't
	1414	// support setname
	1415	if uc := n.conn; uc != nil && uc.caps["setname"] {
	1416	uc.SendMessageLabeled(dc.id, &irc.Message{
	1417	Command: "SETNAME",
	1418	Params: []string{realname},
	1419	})
	1420
[568]	1421	n.Realname = storeRealname
[540]	1422	if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
	1423	dc.logger.Printf("failed to store network realname: %v", err)
	1424	storeErr = err
	1425	}
	1426	return
	1427	}
	1428
	1429	record := n.Network // copy network record because we'll mutate it
[568]	1430	record.Realname = storeRealname
[540]	1431	needUpdate = append(needUpdate, record)
	1432	})
	1433
	1434	// Walk the network list as a second step, because updateNetwork
	1435	// mutates the original list
	1436	for _, record := range needUpdate {
	1437	if _, err := dc.user.updateNetwork(&record); err != nil {
	1438	dc.logger.Printf("failed to update network realname: %v", err)
	1439	storeErr = err
	1440	}
	1441	}
	1442	if storeErr != nil {
	1443	return ircError{&irc.Message{
	1444	Command: "FAIL",
	1445	Params: []string{"SETNAME", "CANNOT_CHANGE_REALNAME", "Failed to update realname"},
	1446	}}
	1447	}
	1448
	1449	if dc.upstream() == nil && dc.caps["setname"] {
	1450	dc.SendMessage(&irc.Message{
	1451	Prefix: dc.prefix(),
	1452	Command: "SETNAME",
	1453	Params: []string{realname},
	1454	})
	1455	}
[146]	1456	case "JOIN":
	1457	var namesStr string
	1458	if err := parseMessageParams(msg, &namesStr); err != nil {
[48]	1459	return err
	1460	}
	1461
[146]	1462	var keys []string
	1463	if len(msg.Params) > 1 {
	1464	keys = strings.Split(msg.Params[1], ",")
	1465	}
	1466
	1467	for i, name := range strings.Split(namesStr, ",") {
[145]	1468	uc, upstreamName, err := dc.unmarshalEntity(name)
	1469	if err != nil {
[158]	1470	return err
[145]	1471	}
[48]	1472
[146]	1473	var key string
	1474	if len(keys) > i {
	1475	key = keys[i]
	1476	}
	1477
[545]	1478	if !uc.isChannel(upstreamName) {
	1479	dc.SendMessage(&irc.Message{
	1480	Prefix: dc.srv.prefix(),
	1481	Command: irc.ERR_NOSUCHCHANNEL,
	1482	Params: []string{name, "Not a channel name"},
	1483	})
	1484	continue
	1485	}
	1486
[146]	1487	params := []string{upstreamName}
	1488	if key != "" {
	1489	params = append(params, key)
	1490	}
[301]	1491	uc.SendMessageLabeled(dc.id, &irc.Message{
[146]	1492	Command: "JOIN",
	1493	Params: params,
[145]	1494	})
[89]	1495
[478]	1496	ch := uc.network.channels.Value(upstreamName)
	1497	if ch != nil {
[285]	1498	// Don't clear the channel key if there's one set
	1499	// TODO: add a way to unset the channel key
[435]	1500	if key != "" {
	1501	ch.Key = key
	1502	}
	1503	uc.network.attach(ch)
	1504	} else {
	1505	ch = &Channel{
	1506	Name: upstreamName,
	1507	Key: key,
	1508	}
[478]	1509	uc.network.channels.SetValue(upstreamName, ch)
[285]	1510	}
[435]	1511	if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
[222]	1512	dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
[89]	1513	}
	1514	}
[146]	1515	case "PART":
	1516	var namesStr string
	1517	if err := parseMessageParams(msg, &namesStr); err != nil {
	1518	return err
	1519	}
	1520
	1521	var reason string
	1522	if len(msg.Params) > 1 {
	1523	reason = msg.Params[1]
	1524	}
	1525
	1526	for _, name := range strings.Split(namesStr, ",") {
	1527	uc, upstreamName, err := dc.unmarshalEntity(name)
	1528	if err != nil {
[158]	1529	return err
[146]	1530	}
	1531
[284]	1532	if strings.EqualFold(reason, "detach") {
[478]	1533	ch := uc.network.channels.Value(upstreamName)
	1534	if ch != nil {
[435]	1535	uc.network.detach(ch)
	1536	} else {
	1537	ch = &Channel{
	1538	Name: name,
	1539	Detached: true,
	1540	}
[478]	1541	uc.network.channels.SetValue(upstreamName, ch)
[284]	1542	}
[435]	1543	if err := dc.srv.db.StoreChannel(uc.network.ID, ch); err != nil {
	1544	dc.logger.Printf("failed to create or update channel %q: %v", upstreamName, err)
	1545	}
[284]	1546	} else {
	1547	params := []string{upstreamName}
	1548	if reason != "" {
	1549	params = append(params, reason)
	1550	}
[301]	1551	uc.SendMessageLabeled(dc.id, &irc.Message{
[284]	1552	Command: "PART",
	1553	Params: params,
	1554	})
[146]	1555
[284]	1556	if err := uc.network.deleteChannel(upstreamName); err != nil {
	1557	dc.logger.Printf("failed to delete channel %q: %v", upstreamName, err)
	1558	}
[146]	1559	}
	1560	}
[159]	1561	case "KICK":
	1562	var channelStr, userStr string
	1563	if err := parseMessageParams(msg, &channelStr, &userStr); err != nil {
	1564	return err
	1565	}
	1566
	1567	channels := strings.Split(channelStr, ",")
	1568	users := strings.Split(userStr, ",")
	1569
	1570	var reason string
	1571	if len(msg.Params) > 2 {
	1572	reason = msg.Params[2]
	1573	}
	1574
	1575	if len(channels) != 1 && len(channels) != len(users) {
	1576	return ircError{&irc.Message{
	1577	Command: irc.ERR_BADCHANMASK,
	1578	Params: []string{dc.nick, channelStr, "Bad channel mask"},
	1579	}}
	1580	}
	1581
	1582	for i, user := range users {
	1583	var channel string
	1584	if len(channels) == 1 {
	1585	channel = channels[0]
	1586	} else {
	1587	channel = channels[i]
	1588	}
	1589
	1590	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	1591	if err != nil {
	1592	return err
	1593	}
	1594
	1595	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	1596	if err != nil {
	1597	return err
	1598	}
	1599
	1600	if ucChannel != ucUser {
	1601	return ircError{&irc.Message{
	1602	Command: irc.ERR_USERNOTINCHANNEL,
[400]	1603	Params: []string{dc.nick, user, channel, "They are on another network"},
[159]	1604	}}
	1605	}
	1606	uc := ucChannel
	1607
	1608	params := []string{upstreamChannel, upstreamUser}
	1609	if reason != "" {
	1610	params = append(params, reason)
	1611	}
[301]	1612	uc.SendMessageLabeled(dc.id, &irc.Message{
[159]	1613	Command: "KICK",
	1614	Params: params,
	1615	})
	1616	}
[69]	1617	case "MODE":
[46]	1618	var name string
	1619	if err := parseMessageParams(msg, &name); err != nil {
	1620	return err
	1621	}
	1622
	1623	var modeStr string
	1624	if len(msg.Params) > 1 {
	1625	modeStr = msg.Params[1]
	1626	}
	1627
[478]	1628	if casemapASCII(name) == dc.nickCM {
[46]	1629	if modeStr != "" {
[554]	1630	if uc := dc.upstream(); uc != nil {
[301]	1631	uc.SendMessageLabeled(dc.id, &irc.Message{
[69]	1632	Command: "MODE",
	1633	Params: []string{uc.nick, modeStr},
	1634	})
[554]	1635	} else {
	1636	dc.SendMessage(&irc.Message{
	1637	Prefix: dc.srv.prefix(),
	1638	Command: irc.ERR_UMODEUNKNOWNFLAG,
	1639	Params: []string{dc.nick, "Cannot change user mode in multi-upstream mode"},
	1640	})
	1641	}
[46]	1642	} else {
[553]	1643	var userMode string
	1644	if uc := dc.upstream(); uc != nil {
	1645	userMode = string(uc.modes)
	1646	}
	1647
[55]	1648	dc.SendMessage(&irc.Message{
	1649	Prefix: dc.srv.prefix(),
[46]	1650	Command: irc.RPL_UMODEIS,
[553]	1651	Params: []string{dc.nick, userMode},
[54]	1652	})
[46]	1653	}
[139]	1654	return nil
[46]	1655	}
[139]	1656
	1657	uc, upstreamName, err := dc.unmarshalEntity(name)
	1658	if err != nil {
	1659	return err
	1660	}
	1661
	1662	if !uc.isChannel(upstreamName) {
	1663	return ircError{&irc.Message{
	1664	Command: irc.ERR_USERSDONTMATCH,
	1665	Params: []string{dc.nick, "Cannot change mode for other users"},
	1666	}}
	1667	}
	1668
	1669	if modeStr != "" {
	1670	params := []string{upstreamName, modeStr}
	1671	params = append(params, msg.Params[2:]...)
[301]	1672	uc.SendMessageLabeled(dc.id, &irc.Message{
[139]	1673	Command: "MODE",
	1674	Params: params,
	1675	})
	1676	} else {
[478]	1677	ch := uc.channels.Value(upstreamName)
	1678	if ch == nil {
[139]	1679	return ircError{&irc.Message{
	1680	Command: irc.ERR_NOSUCHCHANNEL,
	1681	Params: []string{dc.nick, name, "No such channel"},
	1682	}}
	1683	}
	1684
	1685	if ch.modes == nil {
	1686	// we haven't received the initial RPL_CHANNELMODEIS yet
	1687	// ignore the request, we will broadcast the modes later when we receive RPL_CHANNELMODEIS
	1688	return nil
	1689	}
	1690
	1691	modeStr, modeParams := ch.modes.Format()
	1692	params := []string{dc.nick, name, modeStr}
	1693	params = append(params, modeParams...)
	1694
	1695	dc.SendMessage(&irc.Message{
	1696	Prefix: dc.srv.prefix(),
	1697	Command: irc.RPL_CHANNELMODEIS,
	1698	Params: params,
	1699	})
[162]	1700	if ch.creationTime != "" {
	1701	dc.SendMessage(&irc.Message{
	1702	Prefix: dc.srv.prefix(),
	1703	Command: rpl_creationtime,
	1704	Params: []string{dc.nick, name, ch.creationTime},
	1705	})
	1706	}
[139]	1707	}
[160]	1708	case "TOPIC":
	1709	var channel string
	1710	if err := parseMessageParams(msg, &channel); err != nil {
	1711	return err
	1712	}
	1713
[478]	1714	uc, upstreamName, err := dc.unmarshalEntity(channel)
[160]	1715	if err != nil {
	1716	return err
	1717	}
	1718
	1719	if len(msg.Params) > 1 { // setting topic
	1720	topic := msg.Params[1]
[301]	1721	uc.SendMessageLabeled(dc.id, &irc.Message{
[160]	1722	Command: "TOPIC",
[478]	1723	Params: []string{upstreamName, topic},
[160]	1724	})
	1725	} else { // getting topic
[478]	1726	ch := uc.channels.Value(upstreamName)
	1727	if ch == nil {
[160]	1728	return ircError{&irc.Message{
	1729	Command: irc.ERR_NOSUCHCHANNEL,
[478]	1730	Params: []string{dc.nick, upstreamName, "No such channel"},
[160]	1731	}}
	1732	}
	1733	sendTopic(dc, ch)
	1734	}
[177]	1735	case "LIST":
	1736	// TODO: support ELIST when supported by all upstreams
	1737
	1738	pl := pendingLIST{
	1739	downstreamID: dc.id,
	1740	pendingCommands: make(map[int64]*irc.Message),
	1741	}
[298]	1742	var upstream *upstreamConn
[177]	1743	var upstreamChannels map[int64][]string
	1744	if len(msg.Params) > 0 {
[298]	1745	uc, upstreamMask, err := dc.unmarshalEntity(msg.Params[0])
	1746	if err == nil && upstreamMask == "" { // LIST /network: send LIST only to one network
	1747	upstream = uc
	1748	} else {
	1749	upstreamChannels = make(map[int64][]string)
	1750	channels := strings.Split(msg.Params[0], ",")
	1751	for _, channel := range channels {
	1752	uc, upstreamChannel, err := dc.unmarshalEntity(channel)
	1753	if err != nil {
	1754	return err
	1755	}
	1756	upstreamChannels[uc.network.ID] = append(upstreamChannels[uc.network.ID], upstreamChannel)
[177]	1757	}
	1758	}
	1759	}
	1760
	1761	dc.user.pendingLISTs = append(dc.user.pendingLISTs, pl)
	1762	dc.forEachUpstream(func(uc *upstreamConn) {
[298]	1763	if upstream != nil && upstream != uc {
	1764	return
	1765	}
[177]	1766	var params []string
	1767	if upstreamChannels != nil {
	1768	if channels, ok := upstreamChannels[uc.network.ID]; ok {
	1769	params = []string{strings.Join(channels, ",")}
	1770	} else {
	1771	return
	1772	}
	1773	}
	1774	pl.pendingCommands[uc.network.ID] = &irc.Message{
	1775	Command: "LIST",
	1776	Params: params,
	1777	}
[181]	1778	uc.trySendLIST(dc.id)
[177]	1779	})
[140]	1780	case "NAMES":
	1781	if len(msg.Params) == 0 {
	1782	dc.SendMessage(&irc.Message{
	1783	Prefix: dc.srv.prefix(),
	1784	Command: irc.RPL_ENDOFNAMES,
	1785	Params: []string{dc.nick, "*", "End of /NAMES list"},
	1786	})
	1787	return nil
	1788	}
	1789
	1790	channels := strings.Split(msg.Params[0], ",")
	1791	for _, channel := range channels {
[478]	1792	uc, upstreamName, err := dc.unmarshalEntity(channel)
[140]	1793	if err != nil {
	1794	return err
	1795	}
	1796
[478]	1797	ch := uc.channels.Value(upstreamName)
	1798	if ch != nil {
[140]	1799	sendNames(dc, ch)
	1800	} else {
	1801	// NAMES on a channel we have not joined, ask upstream
[176]	1802	uc.SendMessageLabeled(dc.id, &irc.Message{
[140]	1803	Command: "NAMES",
[478]	1804	Params: []string{upstreamName},
[140]	1805	})
	1806	}
	1807	}
[127]	1808	case "WHO":
	1809	if len(msg.Params) == 0 {
	1810	// TODO: support WHO without parameters
	1811	dc.SendMessage(&irc.Message{
	1812	Prefix: dc.srv.prefix(),
	1813	Command: irc.RPL_ENDOFWHO,
[140]	1814	Params: []string{dc.nick, "*", "End of /WHO list"},
[127]	1815	})
	1816	return nil
	1817	}
	1818
	1819	// TODO: support WHO masks
	1820	entity := msg.Params[0]
[478]	1821	entityCM := casemapASCII(entity)
[127]	1822
[520]	1823	if dc.network == nil && entityCM == dc.nickCM {
[142]	1824	// TODO: support AWAY (H/G) in self WHO reply
	1825	dc.SendMessage(&irc.Message{
	1826	Prefix: dc.srv.prefix(),
	1827	Command: irc.RPL_WHOREPLY,
[184]	1828	Params: []string{dc.nick, "*", dc.user.Username, dc.hostname, dc.srv.Hostname, dc.nick, "H", "0 " + dc.realname},
[142]	1829	})
	1830	dc.SendMessage(&irc.Message{
	1831	Prefix: dc.srv.prefix(),
	1832	Command: irc.RPL_ENDOFWHO,
	1833	Params: []string{dc.nick, dc.nick, "End of /WHO list"},
	1834	})
	1835	return nil
	1836	}
[478]	1837	if entityCM == serviceNickCM {
[343]	1838	dc.SendMessage(&irc.Message{
	1839	Prefix: dc.srv.prefix(),
	1840	Command: irc.RPL_WHOREPLY,
	1841	Params: []string{serviceNick, "*", servicePrefix.User, servicePrefix.Host, dc.srv.Hostname, serviceNick, "H", "0 " + serviceRealname},
	1842	})
	1843	dc.SendMessage(&irc.Message{
	1844	Prefix: dc.srv.prefix(),
	1845	Command: irc.RPL_ENDOFWHO,
	1846	Params: []string{dc.nick, serviceNick, "End of /WHO list"},
	1847	})
	1848	return nil
	1849	}
[142]	1850
[127]	1851	uc, upstreamName, err := dc.unmarshalEntity(entity)
	1852	if err != nil {
	1853	return err
	1854	}
	1855
	1856	var params []string
	1857	if len(msg.Params) == 2 {
	1858	params = []string{upstreamName, msg.Params[1]}
	1859	} else {
	1860	params = []string{upstreamName}
	1861	}
	1862
[176]	1863	uc.SendMessageLabeled(dc.id, &irc.Message{
[127]	1864	Command: "WHO",
	1865	Params: params,
	1866	})
[128]	1867	case "WHOIS":
	1868	if len(msg.Params) == 0 {
	1869	return ircError{&irc.Message{
	1870	Command: irc.ERR_NONICKNAMEGIVEN,
	1871	Params: []string{dc.nick, "No nickname given"},
	1872	}}
	1873	}
	1874
	1875	var target, mask string
	1876	if len(msg.Params) == 1 {
	1877	target = ""
	1878	mask = msg.Params[0]
	1879	} else {
	1880	target = msg.Params[0]
	1881	mask = msg.Params[1]
	1882	}
	1883	// TODO: support multiple WHOIS users
	1884	if i := strings.IndexByte(mask, ','); i >= 0 {
	1885	mask = mask[:i]
	1886	}
	1887
[520]	1888	if dc.network == nil && casemapASCII(mask) == dc.nickCM {
[142]	1889	dc.SendMessage(&irc.Message{
	1890	Prefix: dc.srv.prefix(),
	1891	Command: irc.RPL_WHOISUSER,
[184]	1892	Params: []string{dc.nick, dc.nick, dc.user.Username, dc.hostname, "*", dc.realname},
[142]	1893	})
	1894	dc.SendMessage(&irc.Message{
	1895	Prefix: dc.srv.prefix(),
	1896	Command: irc.RPL_WHOISSERVER,
	1897	Params: []string{dc.nick, dc.nick, dc.srv.Hostname, "soju"},
	1898	})
	1899	dc.SendMessage(&irc.Message{
	1900	Prefix: dc.srv.prefix(),
	1901	Command: irc.RPL_ENDOFWHOIS,
	1902	Params: []string{dc.nick, dc.nick, "End of /WHOIS list"},
	1903	})
	1904	return nil
	1905	}
[609]	1906	if casemapASCII(mask) == serviceNickCM {
	1907	dc.SendMessage(&irc.Message{
	1908	Prefix: dc.srv.prefix(),
	1909	Command: irc.RPL_WHOISUSER,
	1910	Params: []string{dc.nick, serviceNick, servicePrefix.User, servicePrefix.Host, "*", serviceRealname},
	1911	})
	1912	dc.SendMessage(&irc.Message{
	1913	Prefix: dc.srv.prefix(),
	1914	Command: irc.RPL_WHOISSERVER,
	1915	Params: []string{dc.nick, serviceNick, dc.srv.Hostname, "soju"},
	1916	})
	1917	dc.SendMessage(&irc.Message{
	1918	Prefix: dc.srv.prefix(),
	1919	Command: irc.RPL_ENDOFWHOIS,
	1920	Params: []string{dc.nick, serviceNick, "End of /WHOIS list"},
	1921	})
	1922	return nil
	1923	}
[142]	1924
[128]	1925	// TODO: support WHOIS masks
	1926	uc, upstreamNick, err := dc.unmarshalEntity(mask)
	1927	if err != nil {
	1928	return err
	1929	}
	1930
	1931	var params []string
	1932	if target != "" {
[299]	1933	if target == mask { // WHOIS nick nick
	1934	params = []string{upstreamNick, upstreamNick}
	1935	} else {
	1936	params = []string{target, upstreamNick}
	1937	}
[128]	1938	} else {
	1939	params = []string{upstreamNick}
	1940	}
	1941
[176]	1942	uc.SendMessageLabeled(dc.id, &irc.Message{
[128]	1943	Command: "WHOIS",
	1944	Params: params,
	1945	})
[562]	1946	case "PRIVMSG", "NOTICE":
[58]	1947	var targetsStr, text string
	1948	if err := parseMessageParams(msg, &targetsStr, &text); err != nil {
	1949	return err
	1950	}
[303]	1951	tags := copyClientTags(msg.Tags)
[58]	1952
	1953	for _, name := range strings.Split(targetsStr, ",") {
[563]	1954	if name == "$"+dc.srv.Hostname \|\| (name == "$*" && dc.network == nil) {
	1955	// "$" means a server mask follows. If it's the bouncer's
	1956	// hostname, broadcast the message to all bouncer users.
	1957	if !dc.user.Admin {
	1958	return ircError{&irc.Message{
	1959	Prefix: dc.srv.prefix(),
	1960	Command: irc.ERR_BADMASK,
	1961	Params: []string{dc.nick, name, "Permission denied to broadcast message to all bouncer users"},
	1962	}}
	1963	}
	1964
	1965	dc.logger.Printf("broadcasting bouncer-wide %v: %v", msg.Command, text)
	1966
	1967	broadcastTags := tags.Copy()
	1968	broadcastTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
	1969	broadcastMsg := &irc.Message{
	1970	Tags: broadcastTags,
	1971	Prefix: servicePrefix,
	1972	Command: msg.Command,
	1973	Params: []string{name, text},
	1974	}
	1975	dc.srv.forEachUser(func(u *user) {
	1976	u.events <- eventBroadcast{broadcastMsg}
	1977	})
	1978	continue
	1979	}
	1980
[529]	1981	if dc.network == nil && casemapASCII(name) == dc.nickCM {
[618]	1982	dc.SendMessage(&irc.Message{
	1983	Tags: msg.Tags.Copy(),
	1984	Prefix: dc.prefix(),
	1985	Command: msg.Command,
	1986	Params: []string{name, text},
	1987	})
[529]	1988	continue
	1989	}
	1990
[562]	1991	if msg.Command == "PRIVMSG" && casemapASCII(name) == serviceNickCM {
[431]	1992	if dc.caps["echo-message"] {
	1993	echoTags := tags.Copy()
	1994	echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
	1995	dc.SendMessage(&irc.Message{
	1996	Tags: echoTags,
	1997	Prefix: dc.prefix(),
[562]	1998	Command: msg.Command,
[431]	1999	Params: []string{name, text},
	2000	})
	2001	}
[117]	2002	handleServicePRIVMSG(dc, text)
	2003	continue
	2004	}
	2005
[127]	2006	uc, upstreamName, err := dc.unmarshalEntity(name)
[58]	2007	if err != nil {
	2008	return err
	2009	}
	2010
[562]	2011	if msg.Command == "PRIVMSG" && uc.network.casemap(upstreamName) == "nickserv" {
[95]	2012	dc.handleNickServPRIVMSG(uc, text)
	2013	}
	2014
[268]	2015	unmarshaledText := text
	2016	if uc.isChannel(upstreamName) {
	2017	unmarshaledText = dc.unmarshalText(uc, text)
	2018	}
[301]	2019	uc.SendMessageLabeled(dc.id, &irc.Message{
[303]	2020	Tags: tags,
[562]	2021	Command: msg.Command,
[268]	2022	Params: []string{upstreamName, unmarshaledText},
[60]	2023	})
[105]	2024
[303]	2025	echoTags := tags.Copy()
	2026	echoTags["time"] = irc.TagValue(time.Now().UTC().Format(serverTimeLayout))
[559]	2027	if uc.account != "" {
	2028	echoTags["account"] = irc.TagValue(uc.account)
	2029	}
[113]	2030	echoMsg := &irc.Message{
[303]	2031	Tags: echoTags,
[113]	2032	Prefix: &irc.Prefix{
	2033	Name: uc.nick,
	2034	User: uc.username,
	2035	},
[562]	2036	Command: msg.Command,
[113]	2037	Params: []string{upstreamName, text},
	2038	}
[239]	2039	uc.produce(upstreamName, echoMsg, dc)
[435]	2040
	2041	uc.updateChannelAutoDetach(upstreamName)
[58]	2042	}
[303]	2043	case "TAGMSG":
	2044	var targetsStr string
	2045	if err := parseMessageParams(msg, &targetsStr); err != nil {
	2046	return err
	2047	}
	2048	tags := copyClientTags(msg.Tags)
	2049
	2050	for _, name := range strings.Split(targetsStr, ",") {
[617]	2051	if dc.network == nil && casemapASCII(name) == dc.nickCM {
	2052	dc.SendMessage(&irc.Message{
	2053	Tags: msg.Tags.Copy(),
	2054	Prefix: dc.prefix(),
	2055	Command: "TAGMSG",
	2056	Params: []string{name},
	2057	})
	2058	continue
	2059	}
	2060
[616]	2061	if casemapASCII(name) == serviceNickCM {
	2062	continue
	2063	}
	2064
[303]	2065	uc, upstreamName, err := dc.unmarshalEntity(name)
	2066	if err != nil {
	2067	return err
	2068	}
[427]	2069	if _, ok := uc.caps["message-tags"]; !ok {
	2070	continue
	2071	}
[303]	2072
	2073	uc.SendMessageLabeled(dc.id, &irc.Message{
	2074	Tags: tags,
	2075	Command: "TAGMSG",
	2076	Params: []string{upstreamName},
	2077	})
[435]	2078
	2079	uc.updateChannelAutoDetach(upstreamName)
[303]	2080	}
[163]	2081	case "INVITE":
	2082	var user, channel string
	2083	if err := parseMessageParams(msg, &user, &channel); err != nil {
	2084	return err
	2085	}
	2086
	2087	ucChannel, upstreamChannel, err := dc.unmarshalEntity(channel)
	2088	if err != nil {
	2089	return err
	2090	}
	2091
	2092	ucUser, upstreamUser, err := dc.unmarshalEntity(user)
	2093	if err != nil {
	2094	return err
	2095	}
	2096
	2097	if ucChannel != ucUser {
	2098	return ircError{&irc.Message{
	2099	Command: irc.ERR_USERNOTINCHANNEL,
[401]	2100	Params: []string{dc.nick, user, channel, "They are on another network"},
[163]	2101	}}
	2102	}
	2103	uc := ucChannel
	2104
[176]	2105	uc.SendMessageLabeled(dc.id, &irc.Message{
[163]	2106	Command: "INVITE",
	2107	Params: []string{upstreamUser, upstreamChannel},
	2108	})
[319]	2109	case "CHATHISTORY":
	2110	var subcommand string
	2111	if err := parseMessageParams(msg, &subcommand); err != nil {
	2112	return err
	2113	}
[516]	2114	var target, limitStr string
	2115	var boundsStr [2]string
	2116	switch subcommand {
	2117	case "AFTER", "BEFORE":
	2118	if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &limitStr); err != nil {
	2119	return err
	2120	}
	2121	case "BETWEEN":
	2122	if err := parseMessageParams(msg, nil, &target, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
	2123	return err
	2124	}
[549]	2125	case "TARGETS":
	2126	if err := parseMessageParams(msg, nil, &boundsStr[0], &boundsStr[1], &limitStr); err != nil {
	2127	return err
	2128	}
[516]	2129	default:
	2130	// TODO: support LATEST, AROUND
[319]	2131	return ircError{&irc.Message{
	2132	Command: "FAIL",
[516]	2133	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, "Unknown command"},
[319]	2134	}}
	2135	}
	2136
[586]	2137	// We don't save history for our service
	2138	if casemapASCII(target) == serviceNickCM {
	2139	dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {})
	2140	return nil
	2141	}
	2142
[441]	2143	store, ok := dc.user.msgStore.(chatHistoryMessageStore)
	2144	if !ok {
[319]	2145	return ircError{&irc.Message{
	2146	Command: irc.ERR_UNKNOWNCOMMAND,
[456]	2147	Params: []string{dc.nick, "CHATHISTORY", "Unknown command"},
[319]	2148	}}
	2149	}
	2150
[585]	2151	network, entity, err := dc.unmarshalEntityNetwork(target)
[319]	2152	if err != nil {
	2153	return err
	2154	}
[585]	2155	entity = network.casemap(entity)
[319]	2156
	2157	// TODO: support msgid criteria
[516]	2158	var bounds [2]time.Time
	2159	bounds[0] = parseChatHistoryBound(boundsStr[0])
	2160	if bounds[0].IsZero() {
[319]	2161	return ircError{&irc.Message{
	2162	Command: "FAIL",
[516]	2163	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[0], "Invalid first bound"},
[319]	2164	}}
	2165	}
	2166
[516]	2167	if boundsStr[1] != "" {
	2168	bounds[1] = parseChatHistoryBound(boundsStr[1])
	2169	if bounds[1].IsZero() {
	2170	return ircError{&irc.Message{
	2171	Command: "FAIL",
	2172	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, boundsStr[1], "Invalid second bound"},
	2173	}}
	2174	}
[319]	2175	}
	2176
	2177	limit, err := strconv.Atoi(limitStr)
	2178	if err != nil \|\| limit < 0 \|\| limit > dc.srv.HistoryLimit {
	2179	return ircError{&irc.Message{
	2180	Command: "FAIL",
[456]	2181	Params: []string{"CHATHISTORY", "INVALID_PARAMS", subcommand, limitStr, "Invalid limit"},
[319]	2182	}}
	2183	}
	2184
[387]	2185	var history []*irc.Message
[319]	2186	switch subcommand {
	2187	case "BEFORE":
[585]	2188	history, err = store.LoadBeforeTime(network, entity, bounds[0], time.Time{}, limit)
[360]	2189	case "AFTER":
[585]	2190	history, err = store.LoadAfterTime(network, entity, bounds[0], time.Now(), limit)
[516]	2191	case "BETWEEN":
	2192	if bounds[0].Before(bounds[1]) {
[585]	2193	history, err = store.LoadAfterTime(network, entity, bounds[0], bounds[1], limit)
[516]	2194	} else {
[585]	2195	history, err = store.LoadBeforeTime(network, entity, bounds[0], bounds[1], limit)
[516]	2196	}
[549]	2197	case "TARGETS":
	2198	// TODO: support TARGETS in multi-upstream mode
[585]	2199	targets, err := store.ListTargets(network, bounds[0], bounds[1], limit)
[549]	2200	if err != nil {
[627]	2201	dc.logger.Printf("failed fetching targets for chathistory: %v", err)
[549]	2202	return ircError{&irc.Message{
	2203	Command: "FAIL",
	2204	Params: []string{"CHATHISTORY", "MESSAGE_ERROR", subcommand, "Failed to retrieve targets"},
	2205	}}
	2206	}
	2207
[551]	2208	dc.SendBatch("draft/chathistory-targets", nil, nil, func(batchRef irc.TagValue) {
	2209	for _, target := range targets {
[585]	2210	if ch := network.channels.Value(target.Name); ch != nil && ch.Detached {
[551]	2211	continue
	2212	}
[549]	2213
[551]	2214	dc.SendMessage(&irc.Message{
	2215	Tags: irc.Tags{"batch": batchRef},
	2216	Prefix: dc.srv.prefix(),
	2217	Command: "CHATHISTORY",
	2218	Params: []string{"TARGETS", target.Name, target.LatestMessage.UTC().Format(serverTimeLayout)},
	2219	})
[550]	2220	}
[549]	2221	})
	2222
	2223	return nil
[319]	2224	}
[387]	2225	if err != nil {
[515]	2226	dc.logger.Printf("failed fetching %q messages for chathistory: %v", target, err)
[387]	2227	return newChatHistoryError(subcommand, target)
	2228	}
	2229
[551]	2230	dc.SendBatch("chathistory", []string{target}, nil, func(batchRef irc.TagValue) {
	2231	for _, msg := range history {
	2232	msg.Tags["batch"] = batchRef
[585]	2233	dc.SendMessage(dc.marshalMessage(msg, network))
[551]	2234	}
[387]	2235	})
[532]	2236	case "BOUNCER":
	2237	var subcommand string
	2238	if err := parseMessageParams(msg, &subcommand); err != nil {
	2239	return err
	2240	}
	2241
	2242	switch strings.ToUpper(subcommand) {
	2243	case "LISTNETWORKS":
[551]	2244	dc.SendBatch("soju.im/bouncer-networks", nil, nil, func(batchRef irc.TagValue) {
	2245	dc.user.forEachNetwork(func(network *network) {
	2246	idStr := fmt.Sprintf("%v", network.ID)
	2247	attrs := getNetworkAttrs(network)
	2248	dc.SendMessage(&irc.Message{
	2249	Tags: irc.Tags{"batch": batchRef},
	2250	Prefix: dc.srv.prefix(),
	2251	Command: "BOUNCER",
	2252	Params: []string{"NETWORK", idStr, attrs.String()},
	2253	})
[532]	2254	})
	2255	})
	2256	case "ADDNETWORK":
	2257	var attrsStr string
	2258	if err := parseMessageParams(msg, nil, &attrsStr); err != nil {
	2259	return err
	2260	}
	2261	attrs := irc.ParseTags(attrsStr)
	2262
	2263	host, ok := attrs.GetTag("host")
	2264	if !ok {
	2265	return ircError{&irc.Message{
	2266	Command: "FAIL",
	2267	Params: []string{"BOUNCER", "NEED_ATTRIBUTE", subcommand, "host", "Missing required host attribute"},
	2268	}}
	2269	}
	2270
	2271	addr := host
	2272	if port, ok := attrs.GetTag("port"); ok {
	2273	addr += ":" + port
	2274	}
	2275
	2276	if tlsStr, ok := attrs.GetTag("tls"); ok && tlsStr == "0" {
	2277	addr = "irc+insecure://" + tlsStr
	2278	}
	2279
	2280	nick, ok := attrs.GetTag("nickname")
	2281	if !ok {
	2282	nick = dc.nick
	2283	}
	2284
	2285	username, _ := attrs.GetTag("username")
	2286	realname, _ := attrs.GetTag("realname")
[533]	2287	pass, _ := attrs.GetTag("pass")
[532]	2288
[568]	2289	if realname == dc.user.Realname {
	2290	realname = ""
	2291	}
	2292
[532]	2293	// TODO: reject unknown attributes
	2294
	2295	record := &Network{
	2296	Addr: addr,
	2297	Nick: nick,
	2298	Username: username,
	2299	Realname: realname,
[533]	2300	Pass: pass,
[542]	2301	Enabled: true,
[532]	2302	}
	2303	network, err := dc.user.createNetwork(record)
	2304	if err != nil {
	2305	return ircError{&irc.Message{
	2306	Command: "FAIL",
	2307	Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to create network: %v", err)},
	2308	}}
	2309	}
	2310
	2311	dc.SendMessage(&irc.Message{
	2312	Prefix: dc.srv.prefix(),
	2313	Command: "BOUNCER",
	2314	Params: []string{"ADDNETWORK", fmt.Sprintf("%v", network.ID)},
	2315	})
	2316	case "CHANGENETWORK":
	2317	var idStr, attrsStr string
	2318	if err := parseMessageParams(msg, nil, &idStr, &attrsStr); err != nil {
	2319	return err
	2320	}
[535]	2321	id, err := parseBouncerNetID(subcommand, idStr)
[532]	2322	if err != nil {
	2323	return err
	2324	}
	2325	attrs := irc.ParseTags(attrsStr)
	2326
	2327	net := dc.user.getNetworkByID(id)
	2328	if net == nil {
	2329	return ircError{&irc.Message{
	2330	Command: "FAIL",
[535]	2331	Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
[532]	2332	}}
	2333	}
	2334
	2335	record := net.Network // copy network record because we'll mutate it
	2336	for k, v := range attrs {
	2337	s := string(v)
	2338	switch k {
	2339	// TODO: host, port, tls
	2340	case "nickname":
	2341	record.Nick = s
	2342	case "username":
	2343	record.Username = s
	2344	case "realname":
	2345	record.Realname = s
[533]	2346	case "pass":
	2347	record.Pass = s
[532]	2348	default:
	2349	return ircError{&irc.Message{
	2350	Command: "FAIL",
	2351	Params: []string{"BOUNCER", "UNKNOWN_ATTRIBUTE", subcommand, k, "Unknown attribute"},
	2352	}}
	2353	}
	2354	}
	2355
	2356	_, err = dc.user.updateNetwork(&record)
	2357	if err != nil {
	2358	return ircError{&irc.Message{
	2359	Command: "FAIL",
	2360	Params: []string{"BOUNCER", "UNKNOWN_ERROR", subcommand, fmt.Sprintf("Failed to update network: %v", err)},
	2361	}}
	2362	}
	2363
	2364	dc.SendMessage(&irc.Message{
	2365	Prefix: dc.srv.prefix(),
	2366	Command: "BOUNCER",
	2367	Params: []string{"CHANGENETWORK", idStr},
	2368	})
	2369	case "DELNETWORK":
	2370	var idStr string
	2371	if err := parseMessageParams(msg, nil, &idStr); err != nil {
	2372	return err
	2373	}
[535]	2374	id, err := parseBouncerNetID(subcommand, idStr)
[532]	2375	if err != nil {
	2376	return err
	2377	}
	2378
	2379	net := dc.user.getNetworkByID(id)
	2380	if net == nil {
	2381	return ircError{&irc.Message{
	2382	Command: "FAIL",
[535]	2383	Params: []string{"BOUNCER", "INVALID_NETID", subcommand, idStr, "Invalid network ID"},
[532]	2384	}}
	2385	}
	2386
	2387	if err := dc.user.deleteNetwork(net.ID); err != nil {
	2388	return err
	2389	}
	2390
	2391	dc.SendMessage(&irc.Message{
	2392	Prefix: dc.srv.prefix(),
	2393	Command: "BOUNCER",
	2394	Params: []string{"DELNETWORK", idStr},
	2395	})
	2396	default:
	2397	return ircError{&irc.Message{
	2398	Command: "FAIL",
	2399	Params: []string{"BOUNCER", "UNKNOWN_COMMAND", subcommand, "Unknown subcommand"},
	2400	}}
	2401	}
[13]	2402	default:
[55]	2403	dc.logger.Printf("unhandled message: %v", msg)
[547]	2404
	2405	// Only forward unknown commands in single-upstream mode
	2406	uc := dc.upstream()
	2407	if uc == nil {
	2408	return newUnknownCommandError(msg.Command)
	2409	}
	2410
	2411	uc.SendMessageLabeled(dc.id, msg)
[13]	2412	}
[42]	2413	return nil
[13]	2414	}
[95]	2415
	2416	func (dc downstreamConn) handleNickServPRIVMSG(uc upstreamConn, text string) {
	2417	username, password, ok := parseNickServCredentials(text, uc.nick)
	2418	if !ok {
	2419	return
	2420	}
	2421
[307]	2422	// User may have e.g. EXTERNAL mechanism configured. We do not want to
	2423	// automatically erase the key pair or any other credentials.
	2424	if uc.network.SASL.Mechanism != "" && uc.network.SASL.Mechanism != "PLAIN" {
	2425	return
	2426	}
	2427
[95]	2428	dc.logger.Printf("auto-saving NickServ credentials with username %q", username)
	2429	n := uc.network
	2430	n.SASL.Mechanism = "PLAIN"
	2431	n.SASL.Plain.Username = username
	2432	n.SASL.Plain.Password = password
[421]	2433	if err := dc.srv.db.StoreNetwork(dc.user.ID, &n.Network); err != nil {
[95]	2434	dc.logger.Printf("failed to save NickServ credentials: %v", err)
	2435	}
	2436	}
	2437
	2438	func parseNickServCredentials(text, nick string) (username, password string, ok bool) {
	2439	fields := strings.Fields(text)
	2440	if len(fields) < 2 {
	2441	return "", "", false
	2442	}
	2443	cmd := strings.ToUpper(fields[0])
	2444	params := fields[1:]
	2445	switch cmd {
	2446	case "REGISTER":
	2447	username = nick
	2448	password = params[0]
	2449	case "IDENTIFY":
	2450	if len(params) == 1 {
	2451	username = nick
[182]	2452	password = params[0]
[95]	2453	} else {
	2454	username = params[0]
[182]	2455	password = params[1]
[95]	2456	}
[182]	2457	case "SET":
	2458	if len(params) == 2 && strings.EqualFold(params[0], "PASSWORD") {
	2459	username = nick
	2460	password = params[1]
	2461	}
[340]	2462	default:
	2463	return "", "", false
[95]	2464	}
	2465	return username, password, true
	2466	}

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