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channel.go
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channel.go
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// Copyright (c) 2012-2014 Jeremy Latt
// Copyright (c) 2014-2015 Edmund Huber
// Copyright (c) 2016- Daniel Oaks <daniel@danieloaks.net>
// released under the MIT license
package irc
import (
"fmt"
"log"
"strconv"
"time"
"github.com/DanielOaks/girc-go/ircmsg"
)
type Channel struct {
flags ChannelModeSet
lists map[ChannelMode]*UserMaskSet
key string
members MemberSet
name string
nameCasefolded string
server *Server
createdTime time.Time
topic string
topicSetBy string
topicSetTime time.Time
userLimit uint64
}
// NewChannel creates a new channel from a `Server` and a `name`
// string, which must be unique on the server.
func NewChannel(s *Server, name string, addDefaultModes bool) *Channel {
casefoldedName, err := CasefoldChannel(name)
if err != nil {
log.Println(fmt.Sprintf("ERROR: Channel name is bad: [%s]", name), err.Error())
return nil
}
channel := &Channel{
flags: make(ChannelModeSet),
lists: map[ChannelMode]*UserMaskSet{
BanMask: NewUserMaskSet(),
ExceptMask: NewUserMaskSet(),
InviteMask: NewUserMaskSet(),
},
members: make(MemberSet),
name: name,
nameCasefolded: casefoldedName,
server: s,
}
if addDefaultModes {
for _, mode := range DefaultChannelModes {
channel.flags[mode] = true
}
}
s.channels.Add(channel)
return channel
}
func (channel *Channel) IsEmpty() bool {
return len(channel.members) == 0
}
func (channel *Channel) Names(client *Client) {
currentNicks := channel.Nicks(client)
// assemble and send replies
maxNamLen := 480 - len(client.server.name) - len(client.nick)
var buffer string
for _, nick := range currentNicks {
if buffer == "" {
buffer += nick
continue
}
if len(buffer)+1+len(nick) > maxNamLen {
client.Send(nil, client.server.name, RPL_NAMREPLY, client.nick, "=", channel.name, buffer)
buffer = nick
continue
}
buffer += " "
buffer += nick
}
client.Send(nil, client.server.name, RPL_NAMREPLY, client.nick, "=", channel.name, buffer)
client.Send(nil, client.server.name, RPL_ENDOFNAMES, client.nick, channel.name, "End of NAMES list")
}
// ClientIsHalfOp returns whether client is at least a halfop.
func (channel *Channel) ClientIsHalfOp(client *Client) bool {
return client.flags[Operator] || channel.members.HasMode(client, Halfop) || channel.members.HasMode(client, ChannelOperator) || channel.members.HasMode(client, ChannelAdmin) || channel.members.HasMode(client, ChannelFounder)
}
// ClientIsOperator returns whether client is at least a chanop.
func (channel *Channel) ClientIsOperator(client *Client) bool {
return client.flags[Operator] || channel.members.HasMode(client, ChannelOperator) || channel.members.HasMode(client, ChannelAdmin) || channel.members.HasMode(client, ChannelFounder)
}
// Prefixes returns a list of prefixes for the given set of channel modes.
func (modes ChannelModeSet) Prefixes(isMultiPrefix bool) string {
var prefixes string
// add prefixes in order from highest to lowest privs
for _, mode := range ChannelPrivModes {
if modes[mode] {
prefixes += ChannelModePrefixes[mode]
}
}
if modes[Voice] {
prefixes += ChannelModePrefixes[Voice]
}
if !isMultiPrefix && len(prefixes) > 1 {
prefixes = string(prefixes[0])
}
return prefixes
}
func (channel *Channel) Nicks(target *Client) []string {
isMultiPrefix := (target != nil) && target.capabilities[MultiPrefix]
isUserhostInNames := (target != nil) && target.capabilities[UserhostInNames]
nicks := make([]string, len(channel.members))
i := 0
for client, modes := range channel.members {
nicks[i] += modes.Prefixes(isMultiPrefix)
if isUserhostInNames {
nicks[i] += client.nickMaskString
} else {
nicks[i] += client.nick
}
i += 1
}
return nicks
}
func (channel *Channel) Id() string {
return channel.name
}
func (channel *Channel) Nick() string {
return channel.name
}
// <mode> <mode params>
func (channel *Channel) ModeString(client *Client) (str string) {
isMember := client.flags[Operator] || channel.members.Has(client)
showKey := isMember && (channel.key != "")
showUserLimit := channel.userLimit > 0
// flags with args
if showKey {
str += Key.String()
}
if showUserLimit {
str += UserLimit.String()
}
// flags
for mode := range channel.flags {
str += mode.String()
}
str = "+" + str
// args for flags with args: The order must match above to keep
// positional arguments in place.
if showKey {
str += " " + channel.key
}
if showUserLimit {
str += " " + strconv.FormatUint(channel.userLimit, 10)
}
return str
}
func (channel *Channel) IsFull() bool {
return (channel.userLimit > 0) &&
(uint64(len(channel.members)) >= channel.userLimit)
}
func (channel *Channel) CheckKey(key string) bool {
return (channel.key == "") || (channel.key == key)
}
func (channel *Channel) Join(client *Client, key string) {
if channel.members.Has(client) {
// already joined, no message?
return
}
if channel.IsFull() {
client.Send(nil, client.server.name, ERR_CHANNELISFULL, channel.name, "Cannot join channel (+l)")
return
}
if !channel.CheckKey(key) {
client.Send(nil, client.server.name, ERR_BADCHANNELKEY, channel.name, "Cannot join channel (+k)")
return
}
isInvited := channel.lists[InviteMask].Match(client.UserHost())
if channel.flags[InviteOnly] && !isInvited {
client.Send(nil, client.server.name, ERR_INVITEONLYCHAN, channel.name, "Cannot join channel (+i)")
return
}
if channel.lists[BanMask].Match(client.UserHost()) &&
!isInvited &&
!channel.lists[ExceptMask].Match(client.UserHost()) {
client.Send(nil, client.server.name, ERR_BANNEDFROMCHAN, channel.name, "Cannot join channel (+b)")
return
}
for member := range channel.members {
if member.capabilities[ExtendedJoin] {
member.Send(nil, client.nickMaskString, "JOIN", channel.name, client.account.Name, client.realname)
} else {
member.Send(nil, client.nickMaskString, "JOIN", channel.name)
}
}
client.channels.Add(channel)
channel.members.Add(client)
if len(channel.members) == 1 {
channel.createdTime = time.Now()
channel.members[client][ChannelFounder] = true
channel.members[client][ChannelOperator] = true
}
if client.capabilities[ExtendedJoin] {
client.Send(nil, client.nickMaskString, "JOIN", channel.name, client.account.Name, client.realname)
} else {
client.Send(nil, client.nickMaskString, "JOIN", channel.name)
}
channel.GetTopic(client)
channel.Names(client)
}
func (channel *Channel) Part(client *Client, message string) {
if !channel.members.Has(client) {
client.Send(nil, client.server.name, ERR_NOTONCHANNEL, channel.name, "You're not on that channel")
return
}
for member := range channel.members {
member.Send(nil, client.nickMaskString, "PART", channel.name, message)
}
channel.Quit(client)
}
func (channel *Channel) GetTopic(client *Client) {
if !channel.members.Has(client) {
client.Send(nil, client.server.name, ERR_NOTONCHANNEL, client.nick, channel.name, "You're not on that channel")
return
}
if channel.topic == "" {
client.Send(nil, client.server.name, RPL_NOTOPIC, client.nick, channel.name, "No topic is set")
return
}
client.Send(nil, client.server.name, RPL_TOPIC, client.nick, channel.name, channel.topic)
client.Send(nil, client.server.name, RPL_TOPICTIME, client.nick, channel.name, channel.topicSetBy, strconv.FormatInt(channel.topicSetTime.Unix(), 10))
}
func (channel *Channel) SetTopic(client *Client, topic string) {
if !(client.flags[Operator] || channel.members.Has(client)) {
client.Send(nil, client.server.name, ERR_NOTONCHANNEL, channel.name, "You're not on that channel")
return
}
if channel.flags[OpOnlyTopic] && !channel.ClientIsOperator(client) {
client.Send(nil, client.server.name, ERR_CHANOPRIVSNEEDED, channel.name, "You're not a channel operator")
return
}
if len(topic) > client.server.limits.TopicLen {
topic = topic[:client.server.limits.TopicLen]
}
channel.topic = topic
channel.topicSetBy = client.nick
channel.topicSetTime = time.Now()
for member := range channel.members {
member.Send(nil, client.nickMaskString, "TOPIC", channel.name, channel.topic)
}
}
func (channel *Channel) CanSpeak(client *Client) bool {
if client.flags[Operator] {
return true
}
if channel.flags[NoOutside] && !channel.members.Has(client) {
return false
}
if channel.flags[Moderated] && !(channel.members.HasMode(client, Voice) ||
channel.members.HasMode(client, ChannelOperator)) {
return false
}
return true
}
func (channel *Channel) PrivMsg(clientOnlyTags *map[string]ircmsg.TagValue, client *Client, message string) {
if !channel.CanSpeak(client) {
client.Send(nil, client.server.name, ERR_CANNOTSENDTOCHAN, channel.name, "Cannot send to channel")
return
}
for member := range channel.members {
if member == client {
continue
}
if member.capabilities[MessageTags] {
member.SendFromClient(client, clientOnlyTags, client.nickMaskString, "PRIVMSG", channel.name, message)
} else {
member.SendFromClient(client, nil, client.nickMaskString, "PRIVMSG", channel.name, message)
}
}
}
func (channel *Channel) applyModeFlag(client *Client, mode ChannelMode,
op ModeOp) bool {
if !channel.ClientIsOperator(client) {
client.Send(nil, client.server.name, ERR_CHANOPRIVSNEEDED, channel.name, "You're not a channel operator")
return false
}
switch op {
case Add:
if channel.flags[mode] {
return false
}
channel.flags[mode] = true
return true
case Remove:
if !channel.flags[mode] {
return false
}
delete(channel.flags, mode)
return true
}
return false
}
func (channel *Channel) applyModeMember(client *Client, mode ChannelMode,
op ModeOp, nick string) *ChannelModeChange {
if nick == "" {
//TODO(dan): shouldn't this be handled before it reaches this function?
client.Send(nil, client.server.name, ERR_NEEDMOREPARAMS, "MODE", "Not enough parameters")
return nil
}
casefoldedName, err := CasefoldName(nick)
target := channel.server.clients.Get(casefoldedName)
if err != nil || target == nil {
client.Send(nil, client.server.name, ERR_NOSUCHNICK, nick, "No such nick")
return nil
}
if !channel.members.Has(target) {
client.Send(nil, client.server.name, ERR_USERNOTINCHANNEL, client.nick, channel.name, "They aren't on that channel")
return nil
}
switch op {
case Add:
if channel.members[target][mode] {
return nil
}
channel.members[target][mode] = true
return &ChannelModeChange{
op: Add,
mode: mode,
arg: nick,
}
case Remove:
if !channel.members[target][mode] {
return nil
}
channel.members[target][mode] = false
return &ChannelModeChange{
op: Remove,
mode: mode,
arg: nick,
}
}
return nil
}
func (channel *Channel) ShowMaskList(client *Client, mode ChannelMode) {
//TODO(dan): WE NEED TO fiX this PROPERLY
log.Fatal("Implement ShowMaskList")
/*
for lmask := range channel.lists[mode].masks {
client.RplMaskList(mode, channel, lmask)
}
client.RplEndOfMaskList(mode, channel)*/
}
func (channel *Channel) applyModeMask(client *Client, mode ChannelMode, op ModeOp, mask string) bool {
list := channel.lists[mode]
if list == nil {
// This should never happen, but better safe than panicky.
return false
}
if (op == List) || (mask == "") {
channel.ShowMaskList(client, mode)
return false
}
if !channel.ClientIsOperator(client) {
client.Send(nil, client.server.name, ERR_CHANOPRIVSNEEDED, channel.name, "You're not a channel operator")
return false
}
if op == Add {
return list.Add(mask)
}
if op == Remove {
return list.Remove(mask)
}
return false
}
func (channel *Channel) Notice(client *Client, message string) {
if !channel.CanSpeak(client) {
client.Send(nil, client.server.name, ERR_CANNOTSENDTOCHAN, channel.name, "Cannot send to channel")
return
}
for member := range channel.members {
if member == client {
continue
}
member.SendFromClient(client, nil, client.nickMaskString, "NOTICE", channel.name, message)
}
}
func (channel *Channel) Quit(client *Client) {
channel.members.Remove(client)
client.channels.Remove(channel)
if channel.IsEmpty() {
channel.server.channels.Remove(channel)
}
}
func (channel *Channel) Kick(client *Client, target *Client, comment string) {
if !(client.flags[Operator] || channel.members.Has(client)) {
client.Send(nil, client.server.name, ERR_NOTONCHANNEL, channel.name, "You're not on that channel")
return
}
if !channel.ClientIsOperator(client) {
client.Send(nil, client.server.name, ERR_CANNOTSENDTOCHAN, channel.name, "Cannot send to channel")
return
}
if !channel.members.Has(target) {
client.Send(nil, client.server.name, ERR_USERNOTINCHANNEL, client.nick, channel.name, "They aren't on that channel")
return
}
if len(comment) > client.server.limits.KickLen {
comment = comment[:client.server.limits.KickLen]
}
for member := range channel.members {
member.Send(nil, client.nickMaskString, "KICK", channel.name, target.nick, comment)
}
channel.Quit(target)
}
func (channel *Channel) Invite(invitee *Client, inviter *Client) {
if channel.flags[InviteOnly] && !channel.ClientIsOperator(inviter) {
inviter.Send(nil, inviter.server.name, ERR_CHANOPRIVSNEEDED, channel.name, "You're not a channel operator")
return
}
if !channel.members.Has(inviter) {
inviter.Send(nil, inviter.server.name, ERR_NOTONCHANNEL, channel.name, "You're not on that channel")
return
}
//TODO(dan): handle this more nicely, keep a list of last X invited channels on invitee rather than explicitly modifying the invite list?
if channel.flags[InviteOnly] {
channel.lists[InviteMask].Add(invitee.UserHost())
}
// send invite-notify
for member := range channel.members {
if member.capabilities[InviteNotify] && member != inviter && member != invitee && channel.ClientIsHalfOp(member) {
member.Send(nil, inviter.nickMaskString, "INVITE", invitee.nick, channel.name)
}
}
//TODO(dan): should inviter.server.name here be inviter.nickMaskString ?
inviter.Send(nil, inviter.server.name, RPL_INVITING, invitee.nick, channel.name)
invitee.Send(nil, inviter.nickMaskString, "INVITE", invitee.nick, channel.name)
if invitee.flags[Away] {
inviter.Send(nil, inviter.server.name, RPL_AWAY, invitee.nick, invitee.awayMessage)
}
}