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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) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
// released under the MIT license
package irc
import (
"fmt"
"log"
"strconv"
"time"
"sync"
"github.com/goshuirc/irc-go/ircmsg"
"github.com/oragono/oragono/irc/caps"
"github.com/tidwall/buntdb"
)
// Channel represents a channel that clients can join.
type Channel struct {
flags ModeSet
lists map[Mode]*UserMaskSet
key string
membersMutex sync.RWMutex
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(ModeSet),
lists: map[Mode]*UserMaskSet{
BanMask: NewUserMaskSet(),
ExceptMask: NewUserMaskSet(),
InviteMask: NewUserMaskSet(),
},
members: make(MemberSet),
name: name,
nameCasefolded: casefoldedName,
server: s,
}
if addDefaultModes {
for _, mode := range s.GetDefaultChannelModes() {
channel.flags[mode] = true
}
}
s.channels.Add(channel)
return channel
}
// IsEmpty returns true if the channel has no clients.
func (channel *Channel) IsEmpty() bool {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
return channel.isEmptyNoMutex()
}
func (channel *Channel) isEmptyNoMutex() bool {
return len(channel.members) == 0
}
// Names sends the list of users joined to the channel to the given client.
func (channel *Channel) Names(client *Client) {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
channel.namesNoMutex(client)
}
func (channel *Channel) namesNoMutex(client *Client) {
currentNicks := channel.nicksNoMutex(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")
}
// ClientIsAtLeast returns whether the client has at least the given channel privilege.
func (channel *Channel) ClientIsAtLeast(client *Client, permission Mode) bool {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
return channel.clientIsAtLeastNoMutex(client, permission)
}
func (channel *Channel) clientIsAtLeastNoMutex(client *Client, permission Mode) bool {
// requires RLock()
// get voice, since it's not a part of ChannelPrivModes
if channel.members.HasMode(client, permission) {
return true
}
// check regular modes
for _, mode := range ChannelPrivModes {
if channel.members.HasMode(client, mode) {
return true
}
if mode == permission {
break
}
}
return false
}
// Prefixes returns a list of prefixes for the given set of channel modes.
func (modes ModeSet) 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) nicksNoMutex(target *Client) []string {
isMultiPrefix := (target != nil) && target.capabilities.Has(caps.MultiPrefix)
isUserhostInNames := (target != nil) && target.capabilities.Has(caps.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++
}
return nicks
}
// <mode> <mode params>
func (channel *Channel) modeStringNoLock(client *Client) (str string) {
// RLock()
isMember := client.flags[Operator] || channel.members.Has(client)
// RUnlock()
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
}
// IsFull returns true if this channel is at its' members limit.
func (channel *Channel) IsFull() bool {
return (channel.userLimit > 0) && (uint64(len(channel.members)) >= channel.userLimit)
}
// CheckKey returns true if the key is not set or matches the given key.
func (channel *Channel) CheckKey(key string) bool {
return (channel.key == "") || (channel.key == key)
}
// Join joins the given client to this channel (if they can be joined).
//TODO(dan): /SAJOIN and maybe a ForceJoin function?
func (channel *Channel) Join(client *Client, key string) {
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
if channel.members.Has(client) {
// already joined, no message needs to be sent
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.nickMaskCasefolded)
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.nickMaskCasefolded) &&
!isInvited &&
!channel.lists[ExceptMask].Match(client.nickMaskCasefolded) {
client.Send(nil, client.server.name, ERR_BANNEDFROMCHAN, channel.name, "Cannot join channel (+b)")
return
}
client.server.logger.Debug("join", fmt.Sprintf("%s joined channel %s", client.nick, channel.name))
for member := range channel.members {
if member.capabilities.Has(caps.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)
// give channel mode if necessary
var newChannel bool
var givenMode *Mode
client.server.registeredChannelsMutex.Lock()
defer client.server.registeredChannelsMutex.Unlock()
client.server.store.Update(func(tx *buntdb.Tx) error {
chanReg := client.server.loadChannelNoMutex(tx, channel.nameCasefolded)
if chanReg == nil {
if len(channel.members) == 1 {
channel.createdTime = time.Now()
channel.members[client][ChannelOperator] = true
givenMode = &ChannelOperator
newChannel = true
}
} else {
// we should only do this on registered channels
if client.account != nil && client.account.Name == chanReg.Founder {
channel.members[client][ChannelFounder] = true
givenMode = &ChannelFounder
}
if len(channel.members) == 1 {
// apply other details if new channel
channel.topic = chanReg.Topic
channel.topicSetBy = chanReg.TopicSetBy
channel.topicSetTime = chanReg.TopicSetTime
channel.name = chanReg.Name
channel.createdTime = chanReg.RegisteredAt
for _, mask := range chanReg.Banlist {
channel.lists[BanMask].Add(mask)
}
for _, mask := range chanReg.Exceptlist {
channel.lists[ExceptMask].Add(mask)
}
for _, mask := range chanReg.Invitelist {
channel.lists[InviteMask].Add(mask)
}
}
}
return nil
})
if client.capabilities.Has(caps.ExtendedJoin) {
client.Send(nil, client.nickMaskString, "JOIN", channel.name, client.account.Name, client.realname)
} else {
client.Send(nil, client.nickMaskString, "JOIN", channel.name)
}
// don't sent topic when it's an entirely new channel
if !newChannel {
channel.getTopicNoMutex(client) // we already have Lock
}
channel.namesNoMutex(client)
if givenMode != nil {
for member := range channel.members {
member.Send(nil, client.server.name, "MODE", channel.name, fmt.Sprintf("+%v", *givenMode), client.nick)
}
}
}
// Part parts the given client from this channel, with the given message.
func (channel *Channel) Part(client *Client, message string) {
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
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.quitNoMutex(client)
client.server.logger.Debug("part", fmt.Sprintf("%s left channel %s", client.nick, channel.name))
}
// GetTopic sends the channel topic to the given client.
func (channel *Channel) GetTopic(client *Client) {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
channel.getTopicNoMutex(client)
}
// GetTopic sends the channel topic to the given client without getting the membersMutex.
// This is required because of channel joins.
func (channel *Channel) getTopicNoMutex(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))
}
// SetTopic sets the topic of this channel, if the client is allowed to do so.
func (channel *Channel) SetTopic(client *Client, topic string) {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
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.ClientIsAtLeast(client, ChannelOperator) {
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.nickMaskString
channel.topicSetTime = time.Now()
for member := range channel.members {
member.Send(nil, client.nickMaskString, "TOPIC", channel.name, channel.topic)
}
// update saved channel topic for registered chans
client.server.registeredChannelsMutex.Lock()
defer client.server.registeredChannelsMutex.Unlock()
client.server.store.Update(func(tx *buntdb.Tx) error {
chanInfo := client.server.loadChannelNoMutex(tx, channel.nameCasefolded)
if chanInfo == nil {
return nil
}
chanInfo.Topic = topic
chanInfo.TopicSetBy = client.nickMaskString
chanInfo.TopicSetTime = time.Now()
client.server.saveChannelNoMutex(tx, channel.nameCasefolded, *chanInfo)
return nil
})
}
// CanSpeak returns true if the client can speak on this channel.
func (channel *Channel) CanSpeak(client *Client) bool {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
if channel.flags[NoOutside] && !channel.members.Has(client) {
return false
}
if channel.flags[Moderated] && !channel.clientIsAtLeastNoMutex(client, Voice) {
return false
}
if channel.flags[RegisteredOnly] && client.account == &NoAccount {
return false
}
return true
}
// TagMsg sends a tag message to everyone in this channel who can accept them.
func (channel *Channel) TagMsg(msgid string, minPrefix *Mode, clientOnlyTags *map[string]ircmsg.TagValue, client *Client) {
channel.sendMessage(msgid, "TAGMSG", []caps.Capability{caps.MessageTags}, minPrefix, clientOnlyTags, client, nil)
}
// sendMessage sends a given message to everyone on this channel.
func (channel *Channel) sendMessage(msgid, cmd string, requiredCaps []caps.Capability, minPrefix *Mode, 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
}
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
// for STATUSMSG
var minPrefixMode Mode
if minPrefix != nil {
minPrefixMode = *minPrefix
}
for member := range channel.members {
if minPrefix != nil && !channel.ClientIsAtLeast(member, minPrefixMode) {
// STATUSMSG
continue
}
if member == client && !client.capabilities.Has(caps.EchoMessage) {
continue
}
canReceive := true
for _, capName := range requiredCaps {
if !member.capabilities.Has(capName) {
canReceive = false
}
}
if !canReceive {
continue
}
var messageTagsToUse *map[string]ircmsg.TagValue
if member.capabilities.Has(caps.MessageTags) {
messageTagsToUse = clientOnlyTags
}
if message == nil {
member.SendFromClient(msgid, client, messageTagsToUse, cmd, channel.name)
} else {
member.SendFromClient(msgid, client, messageTagsToUse, cmd, channel.name, *message)
}
}
}
// SplitPrivMsg sends a private message to everyone in this channel.
func (channel *Channel) SplitPrivMsg(msgid string, minPrefix *Mode, clientOnlyTags *map[string]ircmsg.TagValue, client *Client, message SplitMessage) {
channel.sendSplitMessage(msgid, "PRIVMSG", minPrefix, clientOnlyTags, client, &message)
}
// SplitNotice sends a private message to everyone in this channel.
func (channel *Channel) SplitNotice(msgid string, minPrefix *Mode, clientOnlyTags *map[string]ircmsg.TagValue, client *Client, message SplitMessage) {
channel.sendSplitMessage(msgid, "NOTICE", minPrefix, clientOnlyTags, client, &message)
}
func (channel *Channel) sendSplitMessage(msgid, cmd string, minPrefix *Mode, clientOnlyTags *map[string]ircmsg.TagValue, client *Client, message *SplitMessage) {
if !channel.CanSpeak(client) {
client.Send(nil, client.server.name, ERR_CANNOTSENDTOCHAN, channel.name, "Cannot send to channel")
return
}
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
// for STATUSMSG
var minPrefixMode Mode
if minPrefix != nil {
minPrefixMode = *minPrefix
}
for member := range channel.members {
if minPrefix != nil && !channel.ClientIsAtLeast(member, minPrefixMode) {
// STATUSMSG
continue
}
if member == client && !client.capabilities.Has(caps.EchoMessage) {
continue
}
var tagsToUse *map[string]ircmsg.TagValue
if member.capabilities.Has(caps.MessageTags) {
tagsToUse = clientOnlyTags
}
if message == nil {
member.SendFromClient(msgid, client, tagsToUse, cmd, channel.name)
} else {
member.SendSplitMsgFromClient(msgid, client, tagsToUse, cmd, channel.name, *message)
}
}
}
func (channel *Channel) applyModeFlag(client *Client, mode Mode,
op ModeOp) bool {
if !channel.ClientIsAtLeast(client, ChannelOperator) {
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) applyModeMemberNoMutex(client *Client, mode Mode,
op ModeOp, nick string) *ModeChange {
// requires Lock()
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, client.nick, 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 &ModeChange{
op: Add,
mode: mode,
arg: nick,
}
case Remove:
if !channel.members[target][mode] {
return nil
}
channel.members[target][mode] = false
return &ModeChange{
op: Remove,
mode: mode,
arg: nick,
}
}
return nil
}
// ShowMaskList shows the given list to the client.
func (channel *Channel) ShowMaskList(client *Client, mode Mode) {
// choose appropriate modes
var rpllist, rplendoflist string
if mode == BanMask {
rpllist = RPL_BANLIST
rplendoflist = RPL_ENDOFBANLIST
} else if mode == ExceptMask {
rpllist = RPL_EXCEPTLIST
rplendoflist = RPL_ENDOFEXCEPTLIST
} else if mode == InviteMask {
rpllist = RPL_INVITELIST
rplendoflist = RPL_ENDOFINVITELIST
}
// send out responses
for mask := range channel.lists[mode].masks {
client.Send(nil, client.server.name, rpllist, client.nick, channel.name, mask)
}
client.Send(nil, client.server.name, rplendoflist, client.nick, channel.name, "End of list")
}
func (channel *Channel) applyModeMask(client *Client, mode Mode, 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.ClientIsAtLeast(client, ChannelOperator) {
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
}
// Quit removes the given client from the channel, and also updates friends with the latest client list.
func (channel *Channel) Quit(client *Client, friends *ClientSet) {
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
channel.quitNoMutex(client)
for friend := range channel.members {
friends.Add(friend)
}
}
func (channel *Channel) quitNoMutex(client *Client) {
channel.members.Remove(client)
client.channels.Remove(channel)
if channel.isEmptyNoMutex() {
channel.server.channels.Remove(channel)
}
}
func (channel *Channel) kickNoMutex(client *Client, target *Client, comment string) {
// needs a Lock()
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.clientIsAtLeastNoMutex(client, ChannelOperator) {
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.quitNoMutex(target)
}
// Invite invites the given client to the channel, if the inviter can do so.
func (channel *Channel) Invite(invitee *Client, inviter *Client) {
if channel.flags[InviteOnly] && !channel.ClientIsAtLeast(inviter, ChannelOperator) {
inviter.Send(nil, inviter.server.name, ERR_CHANOPRIVSNEEDED, channel.name, "You're not a channel operator")
return
}
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
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.nickMaskCasefolded)
}
// send invite-notify
for member := range channel.members {
if member.capabilities.Has(caps.InviteNotify) && member != inviter && member != invitee && channel.ClientIsAtLeast(member, Halfop) {
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)
}
}