package irc import ( "bufio" "context" "crypto/rand" "crypto/tls" "encoding/binary" "encoding/hex" "errors" "fmt" mathRand "math/rand" "net" "sort" "strconv" "strings" "sync" "time" "github.com/gissleh/irc/ircutil" "github.com/gissleh/irc/isupport" "github.com/gissleh/irc/list" ) var supportedCaps = []string{ "server-time", "cap-notify", "multi-prefix", "userhost-in-names", "account-notify", "away-notify", "extended-join", "chghost", "account-tag", "echo-message", } // ErrNoConnection is returned if you try to do something requiring a connection, // but there is none. var ErrNoConnection = errors.New("irc: no connection") // ErrTargetAlreadyAdded is returned by Client.AddTarget if that target has already been // added to the client. var ErrTargetAlreadyAdded = errors.New("irc: target already added") // ErrTargetConflict is returned by Client.AddTarget if there already exists a target // matching the name and kind. var ErrTargetConflict = errors.New("irc: target name and kind match existing target") // ErrTargetNotFound is returned by Client.RemoveTarget if the target is not part of // the client's target list var ErrTargetNotFound = errors.New("irc: target not found") // ErrTargetIsStatus is returned by Client.RemoveTarget if the target is the client's // status target var ErrTargetIsStatus = errors.New("irc: cannot remove status target") // A Client is an IRC client. You need to use New to construct it type Client struct { id string config Config mutex sync.RWMutex conn net.Conn ctx context.Context cancel context.CancelFunc events chan *Event sends chan string lastSend time.Time capEnabled map[string]bool capData map[string]string capsRequested []string nick string user string host string quit bool ready bool isupport isupport.ISupport values map[string]interface{} status *Status targets []Target targetIds map[Target]string handlers []Handler } // New creates a new client. The context can be context.Background if you want manually to // tear down clients upon quitting. func New(ctx context.Context, config Config) *Client { client := &Client{ id: generateClientID(), values: make(map[string]interface{}), events: make(chan *Event, 64), sends: make(chan string, 64), capEnabled: make(map[string]bool), capData: make(map[string]string), config: config.WithDefaults(), targetIds: make(map[Target]string, 16), status: &Status{}, } _, _ = client.AddTarget(client.status) client.ctx, client.cancel = context.WithCancel(ctx) go client.handleEventLoop() go client.handleSendLoop() return client } // Context gets the client's context. It's cancelled if the parent context used // in New is, or Destroy is called. func (client *Client) Context() context.Context { return client.ctx } // ID gets the unique identifier for the client, which could be used in data structures func (client *Client) ID() string { client.mutex.RLock() defer client.mutex.RUnlock() return client.id } // Nick gets the nick of the client func (client *Client) Nick() string { client.mutex.RLock() defer client.mutex.RUnlock() return client.nick } // User gets the user/ident of the client func (client *Client) User() string { client.mutex.RLock() defer client.mutex.RUnlock() return client.user } // Host gets the hostname of the client func (client *Client) Host() string { client.mutex.RLock() defer client.mutex.RUnlock() return client.host } // ISupport gets the client's ISupport. This is mutable, and changes to it // *will* affect the client. func (client *Client) ISupport() *isupport.ISupport { return &client.isupport } // CapEnabled returns whether an IRCv3 capability is enabled. func (client *Client) CapEnabled(cap string) bool { client.mutex.RLock() defer client.mutex.RUnlock() return client.capEnabled[cap] } // Ready returns true if the client is marked as ready, which means that it has received the MOTD. func (client *Client) Ready() bool { client.mutex.RLock() defer client.mutex.RUnlock() return client.ready } func (client *Client) State() ClientState { client.mutex.RLock() state := ClientState{ Nick: client.nick, User: client.user, Host: client.host, Connected: client.conn != nil, Ready: client.ready, ISupport: client.isupport.State(), Caps: make([]string, 0, len(client.capEnabled)), Targets: make([]TargetState, 0, len(client.targets)), } for key, enabled := range client.capEnabled { if enabled { state.Caps = append(state.Caps, key) } } sort.Strings(state.Caps) for _, target := range client.targets { tstate := target.State() tstate.ID = client.targetIds[target] state.Targets = append(state.Targets, tstate) } client.mutex.RUnlock() return state } // Connect connects to the server by addr. func (client *Client) Connect(addr string, ssl bool) (err error) { var conn net.Conn if client.Connected() { _ = client.Disconnect() } client.isupport.Reset() client.mutex.Lock() client.quit = false client.mutex.Unlock() _ = client.EmitSync(context.Background(), NewEvent("client", "connecting")) if ssl { conn, err = tls.Dial("tcp", addr, &tls.Config{ InsecureSkipVerify: client.config.SkipSSLVerification, }) if err != nil { return err } } else { conn, err = net.Dial("tcp", addr) if err != nil { return err } } client.Emit(NewEvent("client", "connect")) go func() { reader := bufio.NewReader(conn) replacer := strings.NewReplacer("\r", "", "\n", "") for { line, err := reader.ReadString('\n') if err != nil { break } line = replacer.Replace(line) event, err := ParsePacket(line) if err != nil { continue } client.Emit(event) } client.mutex.Lock() client.conn = nil client.ready = false client.mutex.Unlock() client.Emit(NewEvent("client", "disconnect")) }() client.mutex.Lock() client.conn = conn client.mutex.Unlock() return nil } // Disconnect disconnects from the server. It will either return the // close error, or ErrNoConnection if there is no connection func (client *Client) Disconnect() error { client.mutex.Lock() defer client.mutex.Unlock() if client.conn == nil { return ErrNoConnection } client.quit = true return client.conn.Close() } // Connected returns true if the client has a connection func (client *Client) Connected() bool { client.mutex.RLock() defer client.mutex.RUnlock() return client.conn != nil } // Send sends a line to the server. A line-feed will be automatically added if one // is not provided. func (client *Client) Send(line string) error { client.mutex.RLock() conn := client.conn client.mutex.RUnlock() if conn == nil { return ErrNoConnection } if !strings.HasSuffix(line, "\n") { line += "\r\n" } _, err := conn.Write([]byte(line)) if err != nil { client.EmitNonBlocking(NewErrorEvent("network", err.Error())) _ = client.Disconnect() } return err } // Sendf is Send with a fmt.Sprintf func (client *Client) Sendf(format string, a ...interface{}) error { return client.Send(fmt.Sprintf(format, a...)) } // SendQueued appends a message to a queue that will only send 2 messages // per second to avoid flooding. If the queue is ull, a goroutine will be // spawned to queue it, so this function will always return immediately. // Order may not be guaranteed, however, but if you're sending 64 messages // at once that may not be your greatest concern. // // Failed sends will be discarded quietly to avoid a backup from being // thrown on a new connection. func (client *Client) SendQueued(line string) { select { case client.sends <- line: default: go func() { client.sends <- line }() } } // SendQueuedf is SendQueued with a fmt.Sprintf func (client *Client) SendQueuedf(format string, a ...interface{}) { client.SendQueued(fmt.Sprintf(format, a...)) } // SendCTCP sends a queued message with the following CTCP verb and text. If reply is true, // it will use a NOTICE instead of PRIVMSG. func (client *Client) SendCTCP(verb, targetName string, reply bool, text string) { ircVerb := "PRIVMSG" if reply { ircVerb = "NOTICE" } client.SendQueuedf("%s %s :\x01%s %s\x01", ircVerb, targetName, verb, text) } // SendCTCPf is SendCTCP with a fmt.Sprintf func (client *Client) SendCTCPf(verb, targetName string, reply bool, format string, a ...interface{}) { client.SendCTCP(verb, targetName, reply, fmt.Sprintf(format, a...)) } // Say sends a PRIVMSG with the target name and text, cutting the message if it gets too long. func (client *Client) Say(targetName string, text string) { overhead := client.PrivmsgOverhead(targetName, false) cuts := ircutil.CutMessage(text, overhead) for _, cut := range cuts { client.SendQueuedf("PRIVMSG %s :%s", targetName, cut) } } // Sayf is Say with a fmt.Sprintf. func (client *Client) Sayf(targetName string, format string, a ...interface{}) { client.Say(targetName, fmt.Sprintf(format, a...)) } // Describe sends a CTCP ACTION with the target name and text, cutting the message if it gets too long. func (client *Client) Describe(targetName string, text string) { overhead := client.PrivmsgOverhead(targetName, true) cuts := ircutil.CutMessage(text, overhead) for _, cut := range cuts { client.SendQueuedf("PRIVMSG %s :\x01ACTION %s\x01", targetName, cut) } } // Describef is Describe with a fmt.Sprintf. func (client *Client) Describef(targetName string, format string, a ...interface{}) { client.Describe(targetName, fmt.Sprintf(format, a...)) } // Emit sends an event through the client's event, and it will return immediately // unless the internal channel is filled up. The returned context can be used to // wait for the event, or the client's destruction. func (client *Client) Emit(event Event) context.Context { event.ctx, event.cancel = context.WithCancel(client.ctx) client.events <- &event return event.ctx } // EmitNonBlocking is just like emitInGlobalHandlers, but it will spin off a goroutine if the channel is full. // This lets it be called from other handlers without ever blocking. See Emit for what the // returned context is for. func (client *Client) EmitNonBlocking(event Event) context.Context { event.ctx, event.cancel = context.WithCancel(client.ctx) select { case client.events <- &event: default: go func() { client.events <- &event }() } return event.ctx } // EmitSync emits an event and waits for either its context to complete or the one // passed to it (e.g. a request's context). It's a shorthand for Emit with its // return value used in a `select` along with a passed context. func (client *Client) EmitSync(ctx context.Context, event Event) (err error) { eventCtx := client.Emit(event) select { case <-eventCtx.Done(): { if err := eventCtx.Err(); err != context.Canceled { return err } return nil } case <-ctx.Done(): { return ctx.Err() } } } // EmitInput emits an input event parsed from the line. func (client *Client) EmitInput(line string, target Target) context.Context { event := ParseInput(line) if target != nil { client.mutex.RLock() event.targets = append(event.targets, target) event.targetIds[target] = client.targetIds[target] client.mutex.RUnlock() } else { client.mutex.RLock() event.targets = append(event.targets, client.status) event.targetIds[client.status] = client.targetIds[client.status] client.mutex.RUnlock() } return client.Emit(event) } // Value gets a client value. func (client *Client) Value(key string) interface{} { client.mutex.RLock() defer client.mutex.RUnlock() return client.values[key] } // SetValue sets a client value. func (client *Client) SetValue(key string, value interface{}) { client.mutex.Lock() client.values[key] = value client.mutex.Unlock() } // Destroy destroys the client, which will lead to a disconnect. Cancelling the // parent context will do the same. func (client *Client) Destroy() { _ = client.Disconnect() client.cancel() close(client.sends) close(client.events) } // Destroyed returns true if the client has been destroyed, either by // Destroy or the parent context. func (client *Client) Destroyed() bool { select { case <-client.ctx.Done(): return true default: return false } } // PrivmsgOverhead returns the overhead on a privmsg to the target. If `action` is true, // it will also count the extra overhead of a CTCP ACTION. func (client *Client) PrivmsgOverhead(targetName string, action bool) int { client.mutex.RLock() defer client.mutex.RUnlock() // Return a really safe estimate if user or host is missing. if client.user == "" || client.host == "" { return 200 } return ircutil.MessageOverhead(client.nick, client.user, client.host, targetName, action) } // Join joins one or more channels without a key. func (client *Client) Join(channels ...string) { client.SendQueuedf("JOIN %s", strings.Join(channels, ",")) } // Part parts one or more channels. func (client *Client) Part(channels ...string) { client.SendQueuedf("PART %s", strings.Join(channels, ",")) } // Target gets a target by kind and name func (client *Client) Target(kind string, name string) Target { client.mutex.RLock() defer client.mutex.RUnlock() for _, target := range client.targets { if target.Kind() == kind && target.Name() == name { return target } } return nil } // Targets gets all targets of the given kinds. func (client *Client) Targets(kinds ...string) []Target { if len(kinds) == 0 { client.mutex.Lock() targets := make([]Target, len(client.targets)) copy(targets, client.targets) client.mutex.Unlock() return targets } client.mutex.Lock() targets := make([]Target, 0, len(client.targets)) for _, target := range client.targets { for _, kind := range kinds { if target.Kind() == kind { targets = append(targets, target) break } } } client.mutex.Unlock() return targets } // Status gets the client's status target. func (client *Client) Status() *Status { return client.status } // Channel is a shorthand for getting a channel target and type asserting it. func (client *Client) Channel(name string) *Channel { target := client.Target("channel", name) if target == nil { return nil } return target.(*Channel) } // Channels gets all channel targets the client has. func (client *Client) Channels() []*Channel { targets := client.Targets("channel") channels := make([]*Channel, len(targets)) for i := range targets { channels[i] = targets[i].(*Channel) } return channels } // Query is a shorthand for getting a query target and type asserting it. func (client *Client) Query(name string) *Query { target := client.Target("query", name) if target == nil { return nil } return target.(*Query) } // AddTarget adds a target to the client, generating a unique ID for it. func (client *Client) AddTarget(target Target) (id string, err error) { client.mutex.Lock() defer client.mutex.Unlock() for i := range client.targets { if target == client.targets[i] { err = ErrTargetAlreadyAdded return } else if target.Kind() == client.targets[i].Kind() && target.Name() == client.targets[i].Name() { err = ErrTargetConflict return } } id = generateClientID() client.targets = append(client.targets, target) client.targetIds[target] = id return } // RemoveTarget removes a target to the client func (client *Client) RemoveTarget(target Target) (id string, err error) { if target == client.status { return "", ErrTargetIsStatus } client.mutex.Lock() defer client.mutex.Unlock() for i := range client.targets { if target == client.targets[i] { id = client.targetIds[target] client.targets[i] = client.targets[len(client.targets)-1] client.targets = client.targets[:len(client.targets)-1] delete(client.targetIds, target) // Ensure the channel has been parted if channel, ok := target.(*Channel); ok && !channel.parted { client.SendQueuedf("PART %s", channel.Name()) } return } } err = ErrTargetNotFound return } // FindUser checks each channel to find user info about a user. func (client *Client) FindUser(nick string) (u list.User, ok bool) { client.mutex.RLock() defer client.mutex.RUnlock() for _, target := range client.targets { channel, ok := target.(*Channel) if !ok { continue } user, ok := channel.UserList().User(nick) if !ok { continue } return user, true } return list.User{}, false } // AddHandler adds a handler. This is thread safe, unlike adding global handlers. func (client *Client) AddHandler(handler Handler) { client.mutex.Lock() client.handlers = append(client.handlers[:0], client.handlers...) client.handlers = append(client.handlers, handler) client.mutex.Unlock() } func (client *Client) handleEventLoop() { ticker := time.NewTicker(time.Second * 30) for { select { case event, ok := <-client.events: { if !ok { goto end } client.handleEvent(event) // Turn an unhandled input into a raw command. if event.kind == "input" && !event.preventedDefault { client.SendQueued(strings.ToUpper(event.verb) + " " + event.Text) } event.cancel() } case <-ticker.C: { event := NewEvent("client", "tick") event.ctx, event.cancel = context.WithCancel(client.ctx) client.handleEvent(&event) event.cancel() } case <-client.ctx.Done(): { goto end } } } end: ticker.Stop() _ = client.Disconnect() event := NewEvent("client", "destroy") event.ctx, event.cancel = context.WithCancel(client.ctx) client.handleEvent(&event) event.cancel() } func (client *Client) handleSendLoop() { lastRefresh := time.Time{} queue := client.config.SendRate for line := range client.sends { now := time.Now() deltaTime := now.Sub(lastRefresh) if deltaTime < time.Second { queue-- if queue <= 0 { time.Sleep(time.Second - deltaTime) lastRefresh = now queue = client.config.SendRate - 1 } } else { lastRefresh = now queue = client.config.SendRate - 1 } _ = client.Send(line) } } // handleEvent is always first and gets to break a few rules. func (client *Client) handleEvent(event *Event) { // IRCv3 `server-time` if timeTag, ok := event.Tags["time"]; ok { serverTime, err := time.Parse(time.RFC3339Nano, timeTag) if err == nil && serverTime.Year() > 2000 { event.Time = serverTime } } // For events that were created with targets, handle them now there now. for _, target := range event.targets { target.Handle(event, client) } switch event.name { // Ping Pong case "hook.tick": { client.mutex.RLock() lastSend := time.Since(client.lastSend) client.mutex.RUnlock() if lastSend > time.Second*120 { _ = client.Sendf("PING :%x%x%x", mathRand.Int63(), mathRand.Int63(), mathRand.Int63()) } } case "packet.ping": { message := "PONG" for _, arg := range event.Args { message += " " + arg } if event.Text != "" { message += " :" + event.Text } _ = client.Send(message) } // Client Registration case "client.connect": { // Clear enabled caps and initiate negotiation. client.mutex.Lock() for key := range client.capEnabled { delete(client.capEnabled, key) } client.mutex.Unlock() _ = client.Send("CAP LS 302") // Send server password if configured. if client.config.Password != "" { _ = client.Sendf("PASS :%s", client.config.Password) } // Reuse nick or get from config nick := client.config.Nick client.mutex.RLock() if client.nick != "" { nick = client.nick } client.mutex.RUnlock() // Start registration. _ = client.Sendf("NICK %s", nick) _ = client.Sendf("USER %s 8 * :%s", client.config.User, client.config.RealName) } // Welcome message case "packet.001": { client.mutex.Lock() client.nick = event.Args[0] client.mutex.Unlock() // Send a WHO right away to gather enough client information for precise message cutting. _ = client.Sendf("WHO %s", event.Args[0]) } // Nick rotation case "packet.431", "packet.432", "packet.433", "packet.436": { client.mutex.RLock() hasRegistered := client.nick != "" client.mutex.RUnlock() if !hasRegistered { nick := event.Args[1] // "AltN" -> "AltN+1", ... prev := client.config.Nick sent := false for _, alt := range client.config.Alternatives { if nick == prev { _ = client.Sendf("NICK %s", alt) sent = true break } prev = alt } if !sent { // "LastAlt" -> "Nick23962" _ = client.Sendf("NICK %s%05d", client.config.Nick, mathRand.Int31n(99999)) } } } case "packet.nick": { client.handleInTargets(event.Nick, event) if event.Nick == client.nick { client.SetValue("nick", event.Arg(0)) } } // AddHandler ISupport case "packet.005": { for _, token := range event.Args[1:] { kvpair := strings.Split(token, "=") if len(kvpair) == 2 { client.isupport.Set(kvpair[0], kvpair[1]) } else { client.isupport.Set(kvpair[0], "") } } } // Capability negotiation case "packet.cap": { capCommand := event.Args[1] capTokens := strings.Split(event.Text, " ") switch capCommand { case "LS": { for _, token := range capTokens { split := strings.SplitN(token, "=", 2) key := split[0] if len(key) == 0 { continue } if len(split) == 2 { client.capData[key] = split[1] } for i := range supportedCaps { if supportedCaps[i] == token { client.mutex.Lock() client.capsRequested = append(client.capsRequested, token) client.mutex.Unlock() break } } } if len(event.Args) < 3 || event.Args[2] != "*" { client.mutex.RLock() requestedCount := len(client.capsRequested) client.mutex.RUnlock() if requestedCount > 0 { client.mutex.RLock() requestedCaps := strings.Join(client.capsRequested, " ") client.mutex.RUnlock() _ = client.Send("CAP REQ :" + requestedCaps) } else { _ = client.Send("CAP END") } } } case "ACK": { for _, token := range capTokens { client.mutex.Lock() if !client.capEnabled[token] { client.capEnabled[token] = true } client.mutex.Unlock() } _ = client.Send("CAP END") } case "NAK": { // Remove offenders for _, token := range capTokens { client.mutex.Lock() for i := range client.capsRequested { if token == client.capsRequested[i] { client.capsRequested = append(client.capsRequested[:i], client.capsRequested[i+1:]...) break } } client.mutex.Unlock() } client.mutex.RLock() requestedCaps := strings.Join(client.capsRequested, " ") client.mutex.RUnlock() _ = client.Send("CAP REQ :" + requestedCaps) } case "NEW": { requests := make([]string, 0, len(capTokens)) for _, token := range capTokens { for i := range supportedCaps { if supportedCaps[i] == token { requests = append(requests, token) } } } if len(requests) > 0 { _ = client.Send("CAP REQ :" + strings.Join(requests, " ")) } } case "DEL": { for _, token := range capTokens { client.mutex.Lock() if client.capEnabled[token] { client.capEnabled[token] = false } client.mutex.Unlock() } } } } // User/host detection case "packet.352": // WHO reply { // Example args: test * ~irce 127.0.0.1 localhost.localnetwork Gissleh H :0 ... nick := event.Args[5] user := event.Args[2] host := event.Args[3] if nick == client.nick { client.mutex.Lock() client.user = user client.host = host client.mutex.Unlock() } } case "packet.chghost": { if event.Nick == client.nick { client.mutex.Lock() client.user = event.Args[1] client.host = event.Args[2] client.mutex.Unlock() } // This may be relevant in channels where the client resides. client.handleInTargets(event.Nick, event) } // Channel join/leave/mode handling case "packet.join": { var channel *Channel if event.Nick == client.nick { channel = &Channel{name: event.Arg(0), userlist: list.New(&client.isupport)} _, _ = client.AddTarget(channel) } else { channel = client.Channel(event.Arg(0)) } client.handleInTarget(channel, event) } case "packet.part": { channel := client.Channel(event.Arg(0)) if channel == nil { break } if event.Nick == client.nick { channel.parted = true _, _ = client.RemoveTarget(channel) } else { client.handleInTarget(channel, event) } } case "packet.kick": { channel := client.Channel(event.Arg(0)) if channel == nil { break } if event.Arg(1) == client.nick { channel.parted = true _, _ = client.RemoveTarget(channel) } else { client.handleInTarget(channel, event) } } case "packet.quit": { client.handleInTargets(event.Nick, event) } case "packet.353": // NAMES { channel := client.Channel(event.Arg(2)) if channel != nil { client.handleInTarget(channel, event) } } case "packet.366": // End of NAMES { channel := client.Channel(event.Arg(1)) if channel != nil { client.handleInTarget(channel, event) } } case "packet.mode": { targetName := event.Arg(0) if client.isupport.IsChannel(targetName) { channel := client.Channel(targetName) if channel != nil { client.handleInTarget(channel, event) } } } // Message parsing case "packet.privmsg", "ctcp.action": { // Target the message target := Target(client.status) targetName := event.Arg(0) if targetName == client.nick { target := client.Target("query", targetName) if target == nil { query := &Query{user: list.User{ Nick: event.Nick, User: event.User, Host: event.Host, }} id, _ := client.AddTarget(query) event.RenderTags["spawned"] = id target = query } } else { channel := client.Channel(targetName) if channel != nil { if user, ok := channel.UserList().User(event.Nick); ok { event.RenderTags["prefixedNick"] = user.PrefixedNick } target = channel } else { target = client.status } } client.handleInTarget(target, event) } case "packet.notice": { // Find channel target targetName := event.Arg(0) if client.isupport.IsChannel(targetName) { channel := client.Channel(targetName) if channel != nil { if user, ok := channel.UserList().User(event.Nick); ok { event.RenderTags["prefixedNick"] = user.PrefixedNick } client.handleInTarget(channel, event) } } else { // Try to target by mentioned channel name for _, token := range strings.Fields(event.Text) { if client.isupport.IsChannel(token) { channel := client.Channel(token) if channel == nil { continue } if user, ok := channel.UserList().User(event.Nick); ok { event.RenderTags["prefixedNick"] = user.PrefixedNick } client.handleInTarget(channel, event) break } } } // Otherwise, it belongs in the status target if len(event.targets) == 0 { client.status.Handle(event, client) client.handleInTarget(client.status, event) } } // account-notify case "packet.account": { client.handleInTargets(event.Nick, event) } // away-notify case "packet.away": { client.handleInTargets(event.Nick, event) } // Auto-rejoin case "packet.376", "packet.422": { client.mutex.RLock() channels := make([]string, 0, len(client.targets)) rejoinEvent := NewEvent("info", "rejoin") for _, target := range client.targets { if channel, ok := target.(*Channel); ok { channels = append(channels, channel.Name()) rejoinEvent.targets = append(rejoinEvent.targets, target) rejoinEvent.targetIds[target] = client.targetIds[target] } } client.mutex.RUnlock() if len(channels) > 0 { _ = client.Sendf("JOIN %s", strings.Join(channels, ",")) client.EmitNonBlocking(rejoinEvent) } client.mutex.Lock() client.ready = true client.mutex.Unlock() client.EmitNonBlocking(NewEvent("hook", "ready")) } } if len(event.targets) == 0 { client.handleInTarget(client.status, event) } client.mutex.RLock() clientHandlers := client.handlers client.mutex.RUnlock() for _, handler := range globalHandlers { handler(event, client) } for _, handler := range clientHandlers { handler(event, client) } } func (client *Client) handleInTargets(nick string, event *Event) { client.mutex.RLock() for i := range client.targets { switch target := client.targets[i].(type) { case *Channel: { if nick != "" { if _, ok := target.UserList().User(event.Nick); !ok { continue } } target.Handle(event, client) event.targets = append(event.targets, target) event.targetIds[target] = client.targetIds[target] } case *Query: { if target.user.Nick == nick { target.Handle(event, client) event.targets = append(event.targets, target) event.targetIds[target] = client.targetIds[target] } } case *Status: { if client.nick == event.Nick { target.Handle(event, client) event.targets = append(event.targets, target) event.targetIds[target] = client.targetIds[target] } } } } client.mutex.RUnlock() } func (client *Client) handleInTarget(target Target, event *Event) { if target == nil { return } client.mutex.RLock() target.Handle(event, client) event.targets = append(event.targets, target) event.targetIds[target] = client.targetIds[target] client.mutex.RUnlock() } func generateClientID() string { bytes := make([]byte, 12) _, err := rand.Read(bytes) // Ugly fallback if crypto rand doesn't work. if err != nil { rng := mathRand.NewSource(time.Now().UnixNano()) result := strconv.FormatInt(rng.Int63(), 16) for len(result) < 24 { result += strconv.FormatInt(rng.Int63(), 16) } return result[:24] } binary.BigEndian.PutUint32(bytes[4:], uint32(time.Now().Unix())) return hex.EncodeToString(bytes) }