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328 lines
9.3 KiB
Go
328 lines
9.3 KiB
Go
// Copyright (c) 2012-2014 Jeremy Latt
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// Copyright (c) 2014-2015 Edmund Huber
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// Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
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// released under the MIT license
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package irc
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import (
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"strconv"
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"strings"
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"github.com/oragono/oragono/irc/modes"
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"github.com/oragono/oragono/irc/sno"
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)
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var (
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// DefaultChannelModes are enabled on brand new channels when they're created.
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// this can be overridden in the `channels` config, with the `default-modes` key
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DefaultChannelModes = modes.Modes{
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modes.NoOutside, modes.OpOnlyTopic,
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}
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)
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// ApplyUserModeChanges applies the given changes, and returns the applied changes.
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func ApplyUserModeChanges(client *Client, changes modes.ModeChanges, force bool) modes.ModeChanges {
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applied := make(modes.ModeChanges, 0)
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for _, change := range changes {
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switch change.Mode {
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case modes.Bot, modes.Invisible, modes.WallOps, modes.UserRoleplaying, modes.Operator, modes.LocalOperator, modes.RegisteredOnly:
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switch change.Op {
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case modes.Add:
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if !force && (change.Mode == modes.Operator || change.Mode == modes.LocalOperator) {
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continue
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}
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if client.SetMode(change.Mode, true) {
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if change.Mode == modes.Invisible {
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client.server.stats.ChangeInvisible(1)
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} else if change.Mode == modes.Operator || change.Mode == modes.LocalOperator {
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client.server.stats.ChangeOperators(1)
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}
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applied = append(applied, change)
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}
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case modes.Remove:
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if client.SetMode(change.Mode, false) {
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if change.Mode == modes.Invisible {
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client.server.stats.ChangeInvisible(-1)
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} else if change.Mode == modes.Operator || change.Mode == modes.LocalOperator {
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client.server.stats.ChangeOperators(-1)
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}
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applied = append(applied, change)
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}
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}
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case modes.ServerNotice:
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if !client.HasMode(modes.Operator) {
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continue
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}
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var masks []sno.Mask
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if change.Op == modes.Add || change.Op == modes.Remove {
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var newArg string
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for _, char := range change.Arg {
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mask := sno.Mask(char)
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if sno.ValidMasks[mask] {
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masks = append(masks, mask)
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newArg += string(char)
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}
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}
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change.Arg = newArg
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}
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if change.Op == modes.Add {
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client.server.snomasks.AddMasks(client, masks...)
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applied = append(applied, change)
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} else if change.Op == modes.Remove {
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client.server.snomasks.RemoveMasks(client, masks...)
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applied = append(applied, change)
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}
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}
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// can't do anything to TLS mode
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}
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// return the changes we could actually apply
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return applied
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}
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// ParseDefaultChannelModes parses the `default-modes` line of the config
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func ParseDefaultChannelModes(rawModes *string) modes.Modes {
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if rawModes == nil {
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// not present in config, fall back to compile-time default
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return DefaultChannelModes
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}
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modeChangeStrings := strings.Fields(*rawModes)
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modeChanges, _ := modes.ParseChannelModeChanges(modeChangeStrings...)
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defaultChannelModes := make(modes.Modes, 0)
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for _, modeChange := range modeChanges {
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if modeChange.Op == modes.Add {
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defaultChannelModes = append(defaultChannelModes, modeChange.Mode)
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}
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}
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return defaultChannelModes
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}
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// ApplyChannelModeChanges applies a given set of mode changes.
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func (channel *Channel) ApplyChannelModeChanges(client *Client, isSamode bool, changes modes.ModeChanges, rb *ResponseBuffer) modes.ModeChanges {
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// so we only output one warning for each list type when full
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listFullWarned := make(map[modes.Mode]bool)
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var alreadySentPrivError bool
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applied := make(modes.ModeChanges, 0)
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isListOp := func(change modes.ModeChange) bool {
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return (change.Op == modes.List) || (change.Arg == "")
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}
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hasPrivs := func(change modes.ModeChange) bool {
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if isSamode {
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return true
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}
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switch change.Mode {
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case modes.ChannelFounder, modes.ChannelAdmin, modes.ChannelOperator, modes.Halfop, modes.Voice:
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// List on these modes is a no-op anyway
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if change.Op == modes.List {
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return true
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}
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cfarg, _ := CasefoldName(change.Arg)
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isSelfChange := cfarg == client.NickCasefolded()
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// Admins can't give other people Admin or remove it from others
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if change.Mode == modes.ChannelAdmin && !isSelfChange {
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return false
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}
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if change.Op == modes.Remove && isSelfChange {
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// "There is no restriction, however, on anyone `deopping' themselves"
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// <https://tools.ietf.org/html/rfc2812#section-3.1.5>
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return true
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}
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return channel.ClientIsAtLeast(client, change.Mode)
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case modes.BanMask:
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// #163: allow unprivileged users to list ban masks
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return isListOp(change) || channel.ClientIsAtLeast(client, modes.ChannelOperator)
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default:
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return channel.ClientIsAtLeast(client, modes.ChannelOperator)
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}
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}
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for _, change := range changes {
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if !hasPrivs(change) {
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if !alreadySentPrivError {
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alreadySentPrivError = true
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rb.Add(nil, client.server.name, ERR_CHANOPRIVSNEEDED, client.Nick(), channel.name, client.t("You're not a channel operator"))
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}
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continue
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}
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switch change.Mode {
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case modes.BanMask, modes.ExceptMask, modes.InviteMask:
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if isListOp(change) {
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channel.ShowMaskList(client, change.Mode, rb)
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continue
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}
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// confirm mask looks valid
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mask, err := Casefold(change.Arg)
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if err != nil {
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continue
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}
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switch change.Op {
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case modes.Add:
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if channel.lists[change.Mode].Length() >= client.server.Limits().ChanListModes {
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if !listFullWarned[change.Mode] {
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rb.Add(nil, client.server.name, ERR_BANLISTFULL, client.Nick(), channel.Name(), change.Mode.String(), client.t("Channel list is full"))
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listFullWarned[change.Mode] = true
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}
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continue
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}
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channel.lists[change.Mode].Add(mask)
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applied = append(applied, change)
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case modes.Remove:
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channel.lists[change.Mode].Remove(mask)
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applied = append(applied, change)
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}
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case modes.UserLimit:
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switch change.Op {
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case modes.Add:
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val, err := strconv.Atoi(change.Arg)
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if err == nil {
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channel.setUserLimit(val)
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applied = append(applied, change)
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}
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case modes.Remove:
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channel.setUserLimit(0)
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applied = append(applied, change)
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}
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case modes.Key:
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switch change.Op {
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case modes.Add:
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channel.setKey(change.Arg)
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applied = append(applied, change)
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case modes.Remove:
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channel.setKey("")
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applied = append(applied, change)
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}
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case modes.InviteOnly, modes.Moderated, modes.NoOutside, modes.OpOnlyTopic, modes.RegisteredOnly, modes.Secret, modes.ChanRoleplaying:
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if change.Op == modes.List {
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continue
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}
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if channel.flags.SetMode(change.Mode, change.Op == modes.Add) {
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applied = append(applied, change)
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}
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case modes.ChannelFounder, modes.ChannelAdmin, modes.ChannelOperator, modes.Halfop, modes.Voice:
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if change.Op == modes.List {
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continue
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}
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nick := change.Arg
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if nick == "" {
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rb.Add(nil, client.server.name, ERR_NEEDMOREPARAMS, client.Nick(), "MODE", client.t("Not enough parameters"))
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return nil
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}
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change := channel.applyModeToMember(client, change.Mode, change.Op, nick, rb)
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if change != nil {
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applied = append(applied, *change)
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}
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}
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}
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return applied
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}
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// tests whether l > r, in the channel-user mode ordering (e.g., Halfop > Voice)
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func umodeGreaterThan(l modes.Mode, r modes.Mode) bool {
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for _, mode := range modes.ChannelUserModes {
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if l == mode && r != mode {
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return true
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} else if r == mode {
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return false
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}
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}
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return false
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}
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// ProcessAccountToUmodeChange processes Add/Remove/List operations for channel persistent usermodes.
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func (channel *Channel) ProcessAccountToUmodeChange(client *Client, change modes.ModeChange) (results []modes.ModeChange, err error) {
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hasPrivsOver := func(l modes.Mode, r modes.Mode) bool {
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if l == modes.ChannelAdmin {
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return umodeGreaterThan(l, r)
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}
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return l == r || umodeGreaterThan(l, r)
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}
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changed := false
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defer func() {
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if changed {
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channel.MarkDirty(IncludeLists)
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}
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}()
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account := client.Account()
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isOperChange := client.HasRoleCapabs("chanreg")
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channel.stateMutex.Lock()
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defer channel.stateMutex.Unlock()
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clientMode := channel.accountToUMode[account]
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targetModeNow := channel.accountToUMode[change.Arg]
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var targetModeAfter modes.Mode
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if change.Op == modes.Add {
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targetModeAfter = change.Mode
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}
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// operators and founders can do anything
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hasPrivs := isOperChange || (account != "" && account == channel.registeredFounder)
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// halfop and up can list, and do add/removes at levels <= their own
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if change.Op == modes.List && hasPrivsOver(clientMode, modes.Halfop) {
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hasPrivs = true
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} else if hasPrivsOver(clientMode, modes.Halfop) && hasPrivsOver(clientMode, targetModeNow) && hasPrivsOver(clientMode, targetModeAfter) {
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hasPrivs = true
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}
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if !hasPrivs {
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return nil, errInsufficientPrivs
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}
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switch change.Op {
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case modes.Add:
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if targetModeNow != targetModeAfter {
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channel.accountToUMode[change.Arg] = change.Mode
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changed = true
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return []modes.ModeChange{change}, nil
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}
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return nil, nil
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case modes.Remove:
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if targetModeNow == change.Mode {
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delete(channel.accountToUMode, change.Arg)
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changed = true
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return []modes.ModeChange{change}, nil
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}
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return nil, nil
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case modes.List:
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result := make([]modes.ModeChange, len(channel.accountToUMode))
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pos := 0
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for account, mode := range channel.accountToUMode {
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result[pos] = modes.ModeChange{
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Mode: mode,
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Arg: account,
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Op: modes.Add,
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}
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pos++
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}
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return result, nil
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default:
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// shouldn't happen
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return nil, errInvalidCharacter
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}
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}
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