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modes.go
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modes.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"
"strconv"
"strings"
"github.com/DanielOaks/girc-go/ircmsg"
)
// user mode flags
type UserMode rune
func (mode UserMode) String() string {
return string(mode)
}
type UserModes []UserMode
func (modes UserModes) String() string {
strs := make([]string, len(modes))
for index, mode := range modes {
strs[index] = mode.String()
}
return strings.Join(strs, "")
}
type ModeChange struct {
mode UserMode
op ModeOp
}
func (change *ModeChange) String() string {
return fmt.Sprintf("%s%s", change.op, change.mode)
}
type ModeChanges []*ModeChange
func (changes ModeChanges) String() string {
if len(changes) == 0 {
return ""
}
op := changes[0].op
str := changes[0].op.String()
for _, change := range changes {
if change.op != op {
op = change.op
str += change.op.String()
}
str += change.mode.String()
}
return str
}
// channel mode flags
type ChannelMode rune
func (mode ChannelMode) String() string {
return string(mode)
}
type ChannelModes []ChannelMode
func (modes ChannelModes) String() string {
strs := make([]string, len(modes))
for index, mode := range modes {
strs[index] = mode.String()
}
return strings.Join(strs, "")
}
type ChannelModeChange struct {
mode ChannelMode
op ModeOp
arg string
}
func (change *ChannelModeChange) String() (str string) {
if (change.op == Add) || (change.op == Remove) {
str = change.op.String()
}
str += change.mode.String()
if change.arg != "" {
str += " " + change.arg
}
return
}
type ChannelModeChanges []*ChannelModeChange
func (changes ChannelModeChanges) String() string {
if len(changes) == 0 {
return ""
}
op := changes[0].op
str := changes[0].op.String()
for _, change := range changes {
if change.op != op {
op = change.op
str += change.op.String()
}
str += change.mode.String()
}
for _, change := range changes {
if change.arg == "" {
continue
}
str += " " + change.arg
}
return str
}
type ChannelModeCommand struct {
channel string
changes ChannelModeChanges
}
type ModeOp rune
func (op ModeOp) String() string {
return string(op)
}
const (
Add ModeOp = '+'
List ModeOp = '='
Remove ModeOp = '-'
)
const (
Away UserMode = 'a'
Invisible UserMode = 'i'
LocalOperator UserMode = 'O'
Operator UserMode = 'o'
Restricted UserMode = 'r'
ServerNotice UserMode = 's' // deprecated
TLS UserMode = 'Z'
WallOps UserMode = 'w'
)
var (
SupportedUserModes = UserModes{
Away, Invisible, Operator,
}
// supportedUserModesString acts as a cache for when we introduce users
supportedUserModesString = SupportedUserModes.String()
)
const (
ChannelFounder ChannelMode = 'q' // arg
ChannelAdmin ChannelMode = 'a' // arg
ChannelOperator ChannelMode = 'o' // arg
Halfop ChannelMode = 'h' // arg
Voice ChannelMode = 'v' // arg
BanMask ChannelMode = 'b' // arg
ExceptMask ChannelMode = 'e' // arg
InviteMask ChannelMode = 'I' // arg
InviteOnly ChannelMode = 'i' // flag
Key ChannelMode = 'k' // flag arg
Moderated ChannelMode = 'm' // flag
NoOutside ChannelMode = 'n' // flag
OpOnlyTopic ChannelMode = 't' // flag
Secret ChannelMode = 's' // flag
UserLimit ChannelMode = 'l' // flag arg
)
var (
SupportedChannelModes = ChannelModes{
BanMask, ExceptMask, InviteMask, InviteOnly, Key, NoOutside,
OpOnlyTopic, Secret, UserLimit,
}
// supportedChannelModesString acts as a cache for when we introduce users
supportedChannelModesString = SupportedChannelModes.String()
DefaultChannelModes = ChannelModes{
NoOutside, OpOnlyTopic,
}
// ChannelPrivModes holds the list of modes that are privileged, ie founder/op/halfop, in order.
// voice is not in this list because it cannot perform channel operator actions.
ChannelPrivModes = ChannelModes{
ChannelFounder, ChannelAdmin, ChannelOperator, Halfop,
}
ChannelModePrefixes = map[ChannelMode]string{
ChannelFounder: "~",
ChannelAdmin: "&",
ChannelOperator: "@",
Halfop: "%",
Voice: "+",
}
)
//
// commands
//
// MODE <target> [<modestring> [<mode arguments>...]]
func modeHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
_, errChan := CasefoldChannel(msg.Params[0])
if errChan == nil {
return cmodeHandler(server, client, msg)
} else {
return umodeHandler(server, client, msg)
}
}
// MODE <target> [<modestring> [<mode arguments>...]]
func umodeHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
nickname, err := CasefoldName(msg.Params[0])
target := server.clients.Get(nickname)
if err != nil || target == nil {
client.Send(nil, server.name, ERR_NOSUCHNICK, client.nick, msg.Params[0], "No such nick")
return false
}
//TODO(dan): restricting to Operator here should be done with SAMODE only
// point SAMODE at this handler too, if they are operator and SAMODE was called then fine
if client != target && !client.flags[Operator] {
if len(msg.Params) > 1 {
client.Send(nil, server.name, ERR_USERSDONTMATCH, client.nick, "Can't change modes for other users")
} else {
client.Send(nil, server.name, ERR_USERSDONTMATCH, client.nick, "Can't view modes for other users")
}
return false
}
// assemble changes
changes := make(ModeChanges, 0)
applied := make(ModeChanges, 0)
if len(msg.Params) > 1 {
modeArg := msg.Params[1]
op := ModeOp(modeArg[0])
if (op == Add) || (op == Remove) {
modeArg = modeArg[1:]
} else {
client.Send(nil, server.name, ERR_UNKNOWNMODE, client.nick, string(modeArg[0]), "is an unknown mode character to me")
return false
}
for _, mode := range modeArg {
if mode == '-' || mode == '+' {
op = ModeOp(mode)
continue
}
changes = append(changes, &ModeChange{
mode: UserMode(mode),
op: op,
})
}
for _, change := range changes {
switch change.mode {
case Invisible, ServerNotice, WallOps:
switch change.op {
case Add:
if target.flags[change.mode] {
continue
}
target.flags[change.mode] = true
applied = append(applied, change)
case Remove:
if !target.flags[change.mode] {
continue
}
delete(target.flags, change.mode)
applied = append(applied, change)
}
case Operator, LocalOperator:
if change.op == Remove {
if !target.flags[change.mode] {
continue
}
delete(target.flags, change.mode)
applied = append(applied, change)
}
}
// can't do anything to TLS mode
}
}
if len(applied) > 0 {
client.Send(nil, client.nickMaskString, "MODE", target.nick, applied.String())
} else if client == target {
client.Send(nil, target.nickMaskString, RPL_UMODEIS, target.nick, target.ModeString())
}
return false
}
// MODE <target> [<modestring> [<mode arguments>...]]
func cmodeHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
channelName, err := CasefoldChannel(msg.Params[0])
channel := server.channels.Get(channelName)
if err != nil || channel == nil {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, msg.Params[0], "No such channel")
return false
}
// assemble changes
//TODO(dan): split out assembling changes into func that returns changes, err
changes := make(ChannelModeChanges, 0)
applied := make(ChannelModeChanges, 0)
// TODO(dan): look at separating these into the type A/B/C/D args and using those lists here
if len(msg.Params) > 1 {
modeArg := msg.Params[1]
op := ModeOp(modeArg[0])
if (op == Add) || (op == Remove) {
modeArg = modeArg[1:]
} else {
client.Send(nil, server.name, ERR_UNKNOWNMODE, client.nick, string(modeArg[0]), "is an unknown mode character to me")
return false
}
skipArgs := 2
for _, mode := range modeArg {
if mode == '-' || mode == '+' {
op = ModeOp(mode)
continue
}
change := ChannelModeChange{
mode: ChannelMode(mode),
op: op,
}
// put arg into modechange if needed
switch ChannelMode(mode) {
case BanMask, ExceptMask, InviteMask:
if len(msg.Params) > skipArgs {
change.arg = msg.Params[skipArgs]
skipArgs++
} else {
change.op = List
}
case ChannelFounder, ChannelAdmin, ChannelOperator, Halfop, Voice:
if len(msg.Params) > skipArgs {
change.arg = msg.Params[skipArgs]
skipArgs++
} else {
continue
}
case Key, UserLimit:
// don't require value when removing
if change.op == Add {
if len(msg.Params) > skipArgs {
change.arg = msg.Params[skipArgs]
skipArgs++
} else {
continue
}
}
}
changes = append(changes, &change)
}
for _, change := range changes {
switch change.mode {
case BanMask, ExceptMask, InviteMask:
mask := change.arg
list := channel.lists[change.mode]
if list == nil {
// This should never happen, but better safe than panicky.
client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, "MODE", "Could not complete MODE command")
return false
}
if (change.op == List) || (mask == "") {
channel.ShowMaskList(client, change.mode)
continue
}
// confirm mask looks valid
mask, err = Casefold(mask)
if err != nil {
continue
}
switch change.op {
case Add:
list.Add(mask)
applied = append(applied, change)
case Remove:
list.Remove(mask)
applied = append(applied, change)
}
case UserLimit:
switch change.op {
case Add:
val, err := strconv.ParseUint(change.arg, 10, 64)
if err == nil {
channel.userLimit = val
applied = append(applied, change)
}
case Remove:
channel.userLimit = 0
applied = append(applied, change)
}
case Key:
switch change.op {
case Add:
channel.key = change.arg
case Remove:
channel.key = ""
}
applied = append(applied, change)
case InviteOnly, Moderated, NoOutside, OpOnlyTopic, Secret:
switch change.op {
case Add:
if channel.flags[change.mode] {
continue
}
channel.flags[change.mode] = true
applied = append(applied, change)
case Remove:
if !channel.flags[change.mode] {
continue
}
delete(channel.flags, change.mode)
applied = append(applied, change)
}
case ChannelFounder, ChannelAdmin, ChannelOperator, Halfop, Voice:
// make sure client has privs to edit the given prefix
var hasPrivs bool
for _, mode := range ChannelPrivModes {
if channel.members[client][mode] {
hasPrivs = true
// Admins can't give other people Admin or remove it from others,
// standard for that channel mode, we worry about this later
if mode == ChannelAdmin && change.mode == ChannelAdmin {
hasPrivs = false
}
break
} else if mode == change.mode {
break
}
}
casefoldedName, err := CasefoldName(change.arg)
if err != nil {
continue
}
if !hasPrivs {
if change.op == Remove && casefoldedName == client.nickCasefolded {
// success!
} else {
client.Send(nil, client.server.name, ERR_CHANOPRIVSNEEDED, channel.name, "You're not a channel operator")
continue
}
}
change := channel.applyModeMember(client, change.mode, change.op, change.arg)
if change != nil {
applied = append(changes, change)
}
}
}
}
if len(applied) > 0 {
//TODO(dan): we should change the name of String and make it return a slice here
args := append([]string{channel.name}, strings.Split(applied.String(), " ")...)
client.Send(nil, client.nickMaskString, "MODE", args...)
} else {
//TODO(dan): we should just make ModeString return a slice here
args := append([]string{client.nick, channel.name}, strings.Split(channel.ModeString(client), " ")...)
client.Send(nil, client.nickMaskString, RPL_CHANNELMODEIS, args...)
client.Send(nil, client.nickMaskString, RPL_CHANNELCREATED, client.nick, channel.name, strconv.FormatInt(channel.createdTime.Unix(), 10))
}
return false
}