338 lines
8.4 KiB
Go
338 lines
8.4 KiB
Go
// written by Daniel Oaks <daniel@danieloaks.net>
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// released under the ISC license
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package gircclient
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import (
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"bufio"
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"crypto/tls"
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"errors"
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"fmt"
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"net"
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"strconv"
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"strings"
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"time"
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"github.com/goshuirc/eventmgr"
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"github.com/goshuirc/irc-go/ircmap"
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"github.com/goshuirc/irc-go/ircmsg"
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)
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// ServerConnection is a connection to a single server.
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type ServerConnection struct {
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Name string
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Connected bool
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Registered bool
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Casemapping ircmap.MappingType
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CommandPrefixes []string
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// internal stuff
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RawConnection net.Conn
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eventsIn eventmgr.EventManager
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eventsOut eventmgr.EventManager
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channelsToJoin []channel
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// data we keep track of
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Features ServerFeatures
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Caps ClientCapabilities
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// details users must supply before connection
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Nick string
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InitialNick string
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FallbackNicks []string
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fallbackNickIndex int
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InitialUser string
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InitialRealName string
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ConnectionPass string
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// options
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SimplifyEvents bool
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}
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// newServerConnection returns an initialised ServerConnection, for internal
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// use.
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func newServerConnection(name string) *ServerConnection {
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var sc ServerConnection
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sc.Name = name
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sc.Caps = NewClientCapabilities()
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sc.Features = make(ServerFeatures)
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sc.Caps.AddWantedCaps("account-notify", "away-notify", "extended-join", "multi-prefix", "sasl")
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sc.Caps.AddWantedCaps("account-tag", "cap-notify", "chghost", "invite-notify", "server-time", "userhost-in-names")
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sc.Features.Parse("CHANTYPES=#", "LINELEN=512", "PREFIX=(ov)@+")
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sc.SimplifyEvents = true
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return &sc
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}
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// Connect connects to the given address.
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func (sc *ServerConnection) Connect(address string, ssl bool, tlsconfig *tls.Config) error {
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// check the required attributes
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if sc.InitialNick == "" || sc.InitialUser == "" {
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return errors.New("InitialNick and InitialUser must be set before connecting")
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}
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// connect
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var conn net.Conn
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var err error
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if ssl {
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conn, err = tls.Dial("tcp", address, tlsconfig)
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} else {
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conn, err = net.Dial("tcp", address)
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}
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if err != nil {
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return err
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}
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sc.RawConnection = conn
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sc.Connected = true
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sc.Send(nil, "", "CAP", "LS", "302")
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return nil
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}
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// JoinChannel joins a channel, or marks the channel as to be joined after registration.
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func (sc *ServerConnection) JoinChannel(name string, key string, useKey bool) {
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if sc.Registered {
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params := []string{name}
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if useKey {
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params = []string{name, key}
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}
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sc.Send(nil, "", "JOIN", params...)
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} else {
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sc.channelsToJoin = append(sc.channelsToJoin, channel{
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Name: name,
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Key: key,
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UseKey: useKey,
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})
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}
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}
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// WaitForConnection waits for the serverConnection to become available.
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// This is used when writing a custom event loop.
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func (sc *ServerConnection) WaitForConnection() {
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waitTime := 10 * time.Millisecond
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for sc.RawConnection == nil {
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time.Sleep(waitTime)
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}
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}
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// ProcessIncomingLine processes the incoming IRC line.
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// This is used when writing a custom event loop.
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func (sc *ServerConnection) ProcessIncomingLine(line string) {
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line = strings.Trim(line, "\r\n")
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// ignore empty lines
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if len(line) < 1 {
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return
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}
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// dispatch raw
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rawInfo := eventmgr.NewInfoMap()
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rawInfo["server"] = sc
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rawInfo["direction"] = "in"
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rawInfo["data"] = line
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sc.dispatchRawIn(rawInfo)
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// dispatch events
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message, err := ircmsg.ParseLine(line)
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// convert numerics to names
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cmd := message.Command
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num, err := strconv.Atoi(cmd)
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if err == nil {
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name, exists := Numerics[num]
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if exists {
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cmd = name
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}
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}
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info := eventmgr.NewInfoMap()
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info["server"] = sc
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info["direction"] = "in"
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info["tags"] = message.AllTags()
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info["prefix"] = message.Prefix
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info["command"] = cmd
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info["params"] = message.Params
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// simplify event
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if sc.SimplifyEvents {
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err = SimplifyEvent(info)
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if err != nil {
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fmt.Println("Could not simplify incoming IRC message, skipping line.")
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fmt.Println("line:", line)
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fmt.Println("error:", err)
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fmt.Println("info:", info)
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return
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}
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}
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// IRC commands are case-insensitive
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sc.dispatchIn(strings.ToUpper(cmd), info)
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if strings.ToUpper(cmd) == "PRIVMSG" {
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sc.dispatchCommand(info)
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}
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}
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// Disconnect closes the IRC socket.
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// It is used when writing your own event loop.
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func (sc *ServerConnection) Disconnect() {
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sc.Connected = false
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sc.RawConnection.Close()
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info := eventmgr.NewInfoMap()
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info["server"] = sc
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sc.dispatchOut("server disconnected", info)
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}
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// ReceiveLoop runs a loop of receiving and dispatching new messages.
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func (sc *ServerConnection) ReceiveLoop() {
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// wait for the connection to become available
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sc.WaitForConnection()
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reader := bufio.NewReader(sc.RawConnection)
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for {
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line, err := reader.ReadString('\n')
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if err != nil {
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break
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}
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sc.ProcessIncomingLine(line)
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}
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sc.Disconnect()
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}
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// RegisterEvent registers a new handler for the given event.
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//
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// The standard directions are "in" and "out".
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//
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// 'name' can either be the name of an event, "all", or "raw". Note that "all"
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// will not catch "raw" events, but will catch all others.
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func (sc *ServerConnection) RegisterEvent(direction string, name string, handler eventmgr.HandlerFn, priority int) {
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if direction == "in" || direction == "both" {
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sc.eventsIn.Attach(name, handler, priority)
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}
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if direction == "out" || direction == "both" {
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sc.eventsOut.Attach(name, handler, priority)
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}
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}
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// RegisterCommand registers a command to be called via the configured prefix or the client's nickname (e.g !help, "GoshuBot: help")
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func (sc *ServerConnection) RegisterCommand(name string, handler eventmgr.HandlerFn, priority int) {
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sc.eventsIn.Attach("cmd_"+name, handler, priority)
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}
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// Shutdown closes the connection to the server.
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func (sc *ServerConnection) Shutdown(message string) {
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sc.Send(nil, "", "QUIT", message)
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sc.Connected = false
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sc.RawConnection.Close()
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}
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// Casefold folds the given string using the server's casemapping.
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func (sc *ServerConnection) Casefold(message string) (string, error) {
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return ircmap.Casefold(sc.Casemapping, message)
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}
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// Send sends an IRC message to the server. If the message cannot be converted
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// to a raw IRC line, an error is returned.
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func (sc *ServerConnection) Send(tags map[string]string, prefix string, command string, params ...string) error {
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msg := ircmsg.MakeMessage(tags, prefix, command, params...)
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line, err := msg.Line()
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if err != nil {
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return err
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}
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fmt.Fprint(sc.RawConnection, line)
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// dispatch raw event
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info := eventmgr.NewInfoMap()
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info["server"] = sc
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info["direction"] = "out"
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info["data"] = line
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sc.dispatchRawOut(info)
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var outTags map[string]string
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if tags == nil {
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outTags = map[string]string{}
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} else {
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outTags = tags
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}
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// dispatch real event
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info = eventmgr.NewInfoMap()
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info["server"] = sc
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info["direction"] = "out"
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info["tags"] = outTags
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info["prefix"] = prefix
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info["command"] = command
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info["params"] = params
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// IRC commands are case-insensitive
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sc.dispatchOut(strings.ToUpper(command), info)
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return nil
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}
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// dispatchCommand dispatches an event based on simple commands (e.g !help)
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func (sc *ServerConnection) dispatchCommand(info eventmgr.InfoMap) {
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params := strings.Fields(info["params"].([]string)[1])
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for _, p := range sc.CommandPrefixes {
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if strings.HasPrefix(params[0], p) {
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if len(params) > 1 {
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info["cmdparams"] = params[1:]
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} else {
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info["cmdparams"] = []string{}
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}
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sc.eventsIn.Dispatch("cmd_"+params[0][1:], info)
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return
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}
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}
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if (params[0] == sc.Nick || params[0] == sc.Nick+":") && len(params) > 1 {
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if len(params) > 2 {
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info["cmdparams"] = params[2:]
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} else {
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info["cmdparams"] = []string{}
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}
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sc.eventsIn.Dispatch("cmd_"+params[1], info)
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}
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}
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// dispatchRawIn dispatches raw inbound messages.
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func (sc *ServerConnection) dispatchRawIn(info eventmgr.InfoMap) {
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sc.eventsIn.Dispatch("raw", info)
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}
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// dispatchIn dispatches inbound messages.
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func (sc *ServerConnection) dispatchIn(name string, info eventmgr.InfoMap) {
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sc.eventsIn.Dispatch(name, info)
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sc.eventsIn.Dispatch("all", info)
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}
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// dispatchRawOut dispatches raw outbound messages.
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func (sc *ServerConnection) dispatchRawOut(info eventmgr.InfoMap) {
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sc.eventsOut.Dispatch("raw", info)
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}
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// dispatchOut dispatches outbound messages.
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func (sc *ServerConnection) dispatchOut(name string, info eventmgr.InfoMap) {
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sc.eventsOut.Dispatch(name, info)
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sc.eventsOut.Dispatch("all", info)
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}
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// IsChannel returns true if the given target is a channel.
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func (sc *ServerConnection) IsChannel(target string) bool {
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channelChars := sc.Features["CHANTYPES"].(string)
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return strings.ContainsAny(string(target[0]), channelChars)
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}
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