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package irc
import (
"strconv"
"strings"
"time"
)
// Register a callback to a connection and event code. A callback is a function
// which takes only an Event pointer as parameter. Valid event codes are all
// IRC/CTCP commands and error/response codes. This function returns the ID of
// the registered callback for later management.
func (irc *Connection) AddCallback(eventcode string, callback func(*Event)) int {
eventcode = strings.ToUpper(eventcode)
id := 0
if _, ok := irc.events[eventcode]; !ok {
irc.events[eventcode] = make(map[int]func(*Event))
id = 0
} else {
id = len(irc.events[eventcode])
}
irc.events[eventcode][id] = callback
return id
}
// Remove callback i (ID) from the given event code. This functions returns
// true upon success, false if any error occurs.
func (irc *Connection) RemoveCallback(eventcode string, i int) bool {
eventcode = strings.ToUpper(eventcode)
if event, ok := irc.events[eventcode]; ok {
if _, ok := event[i]; ok {
delete(irc.events[eventcode], i)
return true
}
irc.Log.Printf("Event found, but no callback found at id %d\n", i)
return false
}
irc.Log.Println("Event not found")
return false
}
// Remove all callbacks from a given event code. It returns true
// if given event code is found and cleared.
func (irc *Connection) ClearCallback(eventcode string) bool {
eventcode = strings.ToUpper(eventcode)
if _, ok := irc.events[eventcode]; ok {
irc.events[eventcode] = make(map[int]func(*Event))
return true
}
irc.Log.Println("Event not found")
return false
}
// Replace callback i (ID) associated with a given event code with a new callback function.
func (irc *Connection) ReplaceCallback(eventcode string, i int, callback func(*Event)) {
eventcode = strings.ToUpper(eventcode)
if event, ok := irc.events[eventcode]; ok {
if _, ok := event[i]; ok {
event[i] = callback
return
}
irc.Log.Printf("Event found, but no callback found at id %d\n", i)
}
irc.Log.Printf("Event not found. Use AddCallBack\n")
}
// Execute all callbacks associated with a given event.
func (irc *Connection) RunCallbacks(event *Event) {
msg := event.Message()
if event.Code == "PRIVMSG" && len(msg) > 2 && msg[0] == '\x01' {
event.Code = "CTCP" //Unknown CTCP
if i := strings.LastIndex(msg, "\x01"); i > 0 {
msg = msg[1:i]
} else {
irc.Log.Printf("Invalid CTCP Message: %s\n", strconv.Quote(msg))
return
}
if msg == "VERSION" {
event.Code = "CTCP_VERSION"
} else if msg == "TIME" {
event.Code = "CTCP_TIME"
} else if strings.HasPrefix(msg, "PING") {
event.Code = "CTCP_PING"
} else if msg == "USERINFO" {
event.Code = "CTCP_USERINFO"
} else if msg == "CLIENTINFO" {
event.Code = "CTCP_CLIENTINFO"
} else if strings.HasPrefix(msg, "ACTION") {
event.Code = "CTCP_ACTION"
if len(msg) > 6 {
msg = msg[7:]
} else {
msg = ""
}
}
event.Arguments[len(event.Arguments)-1] = msg
}
if callbacks, ok := irc.events[event.Code]; ok {
if irc.VerboseCallbackHandler {
irc.Log.Printf("%v (%v) >> %#v\n", event.Code, len(callbacks), event)
}
for _, callback := range callbacks {
callback(event)
}
} else if irc.VerboseCallbackHandler {
irc.Log.Printf("%v (0) >> %#v\n", event.Code, event)
}
if callbacks, ok := irc.events["*"]; ok {
if irc.VerboseCallbackHandler {
irc.Log.Printf("%v (0) >> %#v\n", event.Code, event)
}
for _, callback := range callbacks {
callback(event)
}
}
}
// Set up some initial callbacks to handle the IRC/CTCP protocol.
func (irc *Connection) setupCallbacks() {
irc.events = make(map[string]map[int]func(*Event))
//Handle error events.
irc.AddCallback("ERROR", func(e *Event) { irc.Disconnect() })
//Handle ping events
irc.AddCallback("PING", func(e *Event) { irc.SendRaw("PONG :" + e.Message()) })
//Version handler
irc.AddCallback("CTCP_VERSION", func(e *Event) {
irc.SendRawf("NOTICE %s :\x01VERSION %s\x01", e.Nick, irc.Version)
})
irc.AddCallback("CTCP_USERINFO", func(e *Event) {
irc.SendRawf("NOTICE %s :\x01USERINFO %s\x01", e.Nick, irc.user)
})
irc.AddCallback("CTCP_CLIENTINFO", func(e *Event) {
irc.SendRawf("NOTICE %s :\x01CLIENTINFO PING VERSION TIME USERINFO CLIENTINFO\x01", e.Nick)
})
irc.AddCallback("CTCP_TIME", func(e *Event) {
ltime := time.Now()
irc.SendRawf("NOTICE %s :\x01TIME %s\x01", e.Nick, ltime.String())
})
irc.AddCallback("CTCP_PING", func(e *Event) { irc.SendRawf("NOTICE %s :\x01%s\x01", e.Nick, e.Message()) })
// 437: ERR_UNAVAILRESOURCE "<nick/channel> :Nick/channel is temporarily unavailable"
// Add a _ to current nick. If irc.nickcurrent is empty this cannot
// work. It has to be set somewhere first in case the nick is already
// taken or unavailable from the beginning.
irc.AddCallback("437", func(e *Event) {
// If irc.nickcurrent hasn't been set yet, set to irc.nick
if irc.nickcurrent == "" {
irc.nickcurrent = irc.nick
}
if len(irc.nickcurrent) > 8 {
irc.nickcurrent = "_" + irc.nickcurrent
} else {
irc.nickcurrent = irc.nickcurrent + "_"
}
irc.SendRawf("NICK %s", irc.nickcurrent)
})
// 433: ERR_NICKNAMEINUSE "<nick> :Nickname is already in use"
// Add a _ to current nick.
irc.AddCallback("433", func(e *Event) {
// If irc.nickcurrent hasn't been set yet, set to irc.nick
if irc.nickcurrent == "" {
irc.nickcurrent = irc.nick
}
if len(irc.nickcurrent) > 8 {
irc.nickcurrent = "_" + irc.nickcurrent
} else {
irc.nickcurrent = irc.nickcurrent + "_"
}
irc.SendRawf("NICK %s", irc.nickcurrent)
})
irc.AddCallback("PONG", func(e *Event) {
ns, _ := strconv.ParseInt(e.Message(), 10, 64)
delta := time.Duration(time.Now().UnixNano() - ns)
if irc.Debug {
irc.Log.Printf("Lag: %.3f s\n", delta.Seconds())
}
})
// NICK Define a nickname.
// Set irc.nickcurrent to the new nick actually used in this connection.
irc.AddCallback("NICK", func(e *Event) {
if e.Nick == irc.nick {
irc.nickcurrent = e.Message()
}
})
// 1: RPL_WELCOME "Welcome to the Internet Relay Network <nick>!<user>@<host>"
// Set irc.nickcurrent to the actually used nick in this connection.
irc.AddCallback("001", func(e *Event) {
irc.Lock()
irc.nickcurrent = e.Arguments[0]
irc.Unlock()
})
}
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