internal/handlers/irc/handlers.go
package irc
import (
"fmt"
"regexp"
"strings"
"github.com/lrstanley/girc"
)
const (
joinFmt = "* %s joins"
partFmt = "* %s parts"
quitFmt = "* %s quit (%s)"
kickFmt = "* %s kicked %s from %s: %s"
topicChangeFmt = "* %s changed topic to: %s"
topicClearedFmt = "* %s removed topic"
nickFmt = "* %s is now known as: %s"
)
/*
Handler specifies a function that handles an IRC event
In this case, we take an IRC client and return a function that
handles an IRC event
*/
type Handler = func(c ClientInterface) func(*girc.Client, girc.Event)
/*
checkBlacklist checks the IRC blacklist for a name, and returns whether
or not the name is in the blacklist
*/
func checkBlacklist(c ClientInterface, toCheck string) bool {
for _, name := range c.IRCSettings().IRCBlacklist {
if strings.EqualFold(toCheck, name) {
return true
}
}
return false
}
func shouldSendJoin(c ClientInterface, toCheck string) bool {
var settings = c.TgSettings()
if settings.ShowJoinMessage {
return true
} else if settings.JoinMessageAllowList == nil {
return false
}
for _, name := range settings.JoinMessageAllowList {
if strings.EqualFold(toCheck, name) {
return true
}
}
return false
}
func shouldSendLeave(c ClientInterface, toCheck string) bool {
var settings = c.TgSettings()
if settings.ShowLeaveMessage {
return true
} else if settings.LeaveMessageAllowList == nil {
return false
}
for _, name := range settings.LeaveMessageAllowList {
if strings.EqualFold(toCheck, name) {
return true
}
}
return false
}
func hasNoForwardPrefix(c ClientInterface, toCheck string) bool {
noForwardPrefix := c.IRCSettings().NoForwardPrefix
if noForwardPrefix == "" {
return false
}
if strings.HasPrefix(toCheck, c.IRCSettings().NoForwardPrefix) {
return true
}
return false
}
/*
connectHandler returns a function to use as the connect handler for girc,
so that the specified channel is joined after the server connection is established
*/
func connectHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("connectHandler triggered")
if c.IRCSettings().ChannelKey != "" {
c.JoinKey(c.IRCSettings().Channel, c.IRCSettings().ChannelKey)
} else {
c.Join(c.IRCSettings().Channel)
}
}
}
func disconnectHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("disconnectHandler triggered")
if c.TgSettings().ShowDisconnectMessage {
c.SendToTg("Lost connection to '" + c.IRCSettings().Channel + "' on '" + c.IRCSettings().Server + "'")
}
}
}
/*
messageHandler handles the PRIVMSG IRC event, which entails both private
and channel messages. However, it only cares about channel messages
*/
func messageHandler(c ClientInterface) func(*girc.Client, girc.Event) {
var colorStripper = regexp.MustCompile(`[\x02\x1F\x0F\x16]|\x03(\d\d?(,\d\d?)?)?`)
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("messageHandler triggered")
// Only send if user is not in blacklist
if !(checkBlacklist(c, e.Source.Name)) {
if e.IsFromChannel() {
formatted := ""
if e.IsAction() {
msg := e.Last()
// Strips out ACTION word from text
formatted = "* " + e.Source.Name + " " + msg[8:len(msg)-1]
} else {
formatted = c.IRCSettings().Prefix + e.Source.Name + c.IRCSettings().Suffix + " " + e.Params[1]
}
if hasNoForwardPrefix(c, e.Params[1]) {
return // sender didn't want this forwarded
}
// Strip of mIRC formatting
formatted = colorStripper.ReplaceAllString(formatted, "")
c.SendToTg(formatted)
}
}
}
}
func joinHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("joinHandler triggered")
if (e.Source != nil) && shouldSendJoin(c, e.Source.Name) {
c.SendToTg(fmt.Sprintf(joinFmt, e.Source.Name))
}
}
}
func partHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("partHandler triggered")
if (e.Source != nil) && shouldSendLeave(c, e.Source.Name) {
c.SendToTg(fmt.Sprintf(partFmt, e.Source.Name))
}
}
}
func topicHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("topicHandler triggered")
if c.TgSettings().ShowTopicMessage {
// e.Source.Name is the user who changed the topic.
// e.Params[0] is the channel where the topic changed.
// e.Params[1] is the new topic. We should assume that
// this may or may not appear as its possible to clear a topic.
if len(e.Params) <= 1 {
c.SendToTg(fmt.Sprintf(topicClearedFmt, e.Source.Name))
} else {
c.SendToTg(fmt.Sprintf(topicChangeFmt, e.Source.Name, e.Params[1]))
}
}
}
}
func quitHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("quitHandler triggered")
if (e.Source != nil) && shouldSendLeave(c, e.Source.Name) {
c.SendToTg(fmt.Sprintf(quitFmt, e.Source.Name, e.Params[0]))
}
}
}
/*
kickHandler handles the event when a user is kicked from the IRC channel.
*/
func kickHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("kickHandler triggered")
if c.TgSettings().ShowKickMessage {
var reason string
// Params are obtained from the kick command: /kick #channel nickname [reason]
if len(e.Params) == 2 {
reason = "Reason Undefined"
} else {
reason = e.Last()
}
c.SendToTg(fmt.Sprintf(kickFmt, e.Source.Name, e.Params[1], e.Params[0], reason))
}
}
}
func nickHandler(c ClientInterface) func(*girc.Client, girc.Event) {
return func(gc *girc.Client, e girc.Event) {
c.Logger().LogDebug("nickHandler triggered")
if c.TgSettings().ShowNickMessage {
// e.Source.Name is the original name.
// e.Params[0] is the new nick name.
// However, let's assume it is possible (though unlikely)
// e.Params can be empty.
var newName string
if len(e.Params) == 0 {
newName = "Unspecified Name"
} else {
newName = e.Params[0]
}
c.SendToTg(fmt.Sprintf(nickFmt, e.Source.Name, newName))
}
}
}
/*
getHandlerMapping returns a mapping of girc event types to handlers
*/
func getHandlerMapping() map[string]Handler {
return map[string]Handler{
girc.CONNECTED: connectHandler,
girc.DISCONNECTED: disconnectHandler,
girc.JOIN: joinHandler,
girc.KICK: kickHandler,
girc.NICK: nickHandler,
girc.PRIVMSG: messageHandler,
girc.PART: partHandler,
girc.TOPIC: topicHandler,
girc.QUIT: quitHandler,
}
}