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- // Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
- // released under the MIT license
-
- package irc
-
- import (
- "fmt"
- "sort"
- "strings"
- "time"
-
- "github.com/goshuirc/irc-go/ircfmt"
- "github.com/oragono/oragono/irc/modes"
- "github.com/oragono/oragono/irc/sno"
- "github.com/oragono/oragono/irc/utils"
- )
-
- const chanservHelp = `ChanServ lets you register and manage channels.`
- const chanservMask = "ChanServ!ChanServ@localhost"
-
- func chanregEnabled(config *Config) bool {
- return config.Channels.Registration.Enabled
- }
-
- var (
- chanservCommands = map[string]*serviceCommand{
- "op": {
- handler: csOpHandler,
- help: `Syntax: $bOP #channel [nickname]$b
-
- OP makes the given nickname, or yourself, a channel admin. You can only use
- this command if you're the founder of the channel.`,
- helpShort: `$bOP$b makes the given user (or yourself) a channel admin.`,
- authRequired: true,
- enabled: chanregEnabled,
- minParams: 1,
- },
- "register": {
- handler: csRegisterHandler,
- help: `Syntax: $bREGISTER #channel$b
-
- REGISTER lets you own the given channel. If you rejoin this channel, you'll be
- given admin privs on it. Modes set on the channel and the topic will also be
- remembered.`,
- helpShort: `$bREGISTER$b lets you own a given channel.`,
- authRequired: true,
- enabled: chanregEnabled,
- minParams: 1,
- },
- "unregister": {
- handler: csUnregisterHandler,
- help: `Syntax: $bUNREGISTER #channel [code]$b
-
- UNREGISTER deletes a channel registration, allowing someone else to claim it.
- To prevent accidental unregistrations, a verification code is required;
- invoking the command without a code will display the necessary code.`,
- helpShort: `$bUNREGISTER$b deletes a channel registration.`,
- enabled: chanregEnabled,
- minParams: 1,
- },
- "drop": {
- aliasOf: "unregister",
- },
- "amode": {
- handler: csAmodeHandler,
- help: `Syntax: $bAMODE #channel [mode change] [account]$b
-
- AMODE lists or modifies persistent mode settings that affect channel members.
- For example, $bAMODE #channel +o dan$b grants the the holder of the "dan"
- account the +o operator mode every time they join #channel. To list current
- accounts and modes, use $bAMODE #channel$b. Note that users are always
- referenced by their registered account names, not their nicknames.`,
- helpShort: `$bAMODE$b modifies persistent mode settings for channel members.`,
- enabled: chanregEnabled,
- minParams: 1,
- },
- "clear": {
- handler: csClearHandler,
- help: `Syntax: $bCLEAR #channel target$b
-
- CLEAR removes users or settings from a channel. Specifically:
-
- $bCLEAR #channel users$b kicks all users except for you.
- $bCLEAR #channel access$b resets all stored bans, invites, ban exceptions,
- and persistent user-mode grants made with CS AMODE.`,
- helpShort: `$bCLEAR$b removes users or settings from a channel.`,
- enabled: chanregEnabled,
- minParams: 2,
- },
- "transfer": {
- handler: csTransferHandler,
- help: `Syntax: $bTRANSFER [accept] #channel user [code]$b
-
- TRANSFER transfers ownership of a channel from one user to another.
- To prevent accidental transfers, a verification code is required. For
- example, $bTRANSFER #channel alice$b displays the required confirmation
- code, then $bTRANSFER #channel alice 2930242125$b initiates the transfer.
- Unless you are an IRC operator with the correct permissions, alice must
- then accept the transfer, which she can do with $bTRANSFER accept #channel$b.
- To cancel a pending transfer, transfer the channel to yourself.`,
- helpShort: `$bTRANSFER$b transfers ownership of a channel to another user.`,
- enabled: chanregEnabled,
- minParams: 2,
- },
- "purge": {
- handler: csPurgeHandler,
- help: `Syntax: $bPURGE #channel [reason]$b
-
- PURGE blacklists a channel from the server, making it impossible to join
- or otherwise interact with the channel. If the channel currently has members,
- they will be kicked from it. PURGE may also be applied preemptively to
- channels that do not currently have members.`,
- helpShort: `$bPURGE$b blacklists a channel from the server.`,
- capabs: []string{"chanreg"},
- minParams: 1,
- maxParams: 2,
- unsplitFinalParam: true,
- },
- "unpurge": {
- handler: csUnpurgeHandler,
- help: `Syntax: $bUNPURGE #channel$b
-
- UNPURGE removes any blacklisting of a channel that was previously
- set using PURGE.`,
- helpShort: `$bUNPURGE$b undoes a previous PURGE command.`,
- capabs: []string{"chanreg"},
- minParams: 1,
- },
- "info": {
- handler: csInfoHandler,
- help: `Syntax: $INFO #channel$b
-
- INFO displays info about a registered channel.`,
- helpShort: `$bINFO$b displays info about a registered channel.`,
- enabled: chanregEnabled,
- minParams: 1,
- },
- "get": {
- handler: csGetHandler,
- help: `Syntax: $bGET #channel <setting>$b
-
- GET queries the current values of the channel settings. For more information
- on the settings and their possible values, see HELP SET.`,
- helpShort: `$bGET$b queries the current values of a channel's settings`,
- enabled: chanregEnabled,
- minParams: 2,
- },
- "set": {
- handler: csSetHandler,
- helpShort: `$bSET$b modifies a channel's settings`,
- // these are broken out as separate strings so they can be translated separately
- helpStrings: []string{
- `Syntax $bSET #channel <setting> <value>$b
-
- SET modifies a channel's settings. The following settings are available:`,
-
- `$bHISTORY$b
- 'history' lets you control how channel history is stored. Your options are:
- 1. 'off' [no history]
- 2. 'ephemeral' [a limited amount of temporary history, not stored on disk]
- 3. 'on' [history stored in a permanent database, if available]
- 4. 'default' [use the server default]`,
- },
- enabled: chanregEnabled,
- minParams: 3,
- },
- }
- )
-
- // csNotice sends the client a notice from ChanServ
- func csNotice(rb *ResponseBuffer, text string) {
- rb.Add(nil, chanservMask, "NOTICE", rb.target.Nick(), text)
- }
-
- func csAmodeHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- channelName := params[0]
-
- channel := server.channels.Get(channelName)
- if channel == nil {
- csNotice(rb, client.t("Channel does not exist"))
- return
- } else if channel.Founder() == "" {
- csNotice(rb, client.t("Channel is not registered"))
- return
- }
-
- modeChanges, unknown := modes.ParseChannelModeChanges(params[1:]...)
- var change modes.ModeChange
- if len(modeChanges) > 1 || len(unknown) > 0 {
- csNotice(rb, client.t("Invalid mode change"))
- return
- } else if len(modeChanges) == 1 {
- change = modeChanges[0]
- } else {
- change = modes.ModeChange{Op: modes.List}
- }
-
- // normalize and validate the account argument
- accountIsValid := false
- change.Arg, _ = CasefoldName(change.Arg)
- switch change.Op {
- case modes.List:
- accountIsValid = true
- case modes.Add:
- // if we're adding a mode, the account must exist
- if change.Arg != "" {
- _, err := server.accounts.LoadAccount(change.Arg)
- accountIsValid = (err == nil)
- }
- case modes.Remove:
- // allow removal of accounts that may have been deleted
- accountIsValid = (change.Arg != "")
- }
- if !accountIsValid {
- csNotice(rb, client.t("Account does not exist"))
- return
- }
-
- affectedModes, err := channel.ProcessAccountToUmodeChange(client, change)
-
- if err == errInsufficientPrivs {
- csNotice(rb, client.t("Insufficient privileges"))
- return
- } else if err != nil {
- csNotice(rb, client.t("Internal error"))
- return
- }
-
- switch change.Op {
- case modes.List:
- // sort the persistent modes in descending order of priority
- sort.Slice(affectedModes, func(i, j int) bool {
- return umodeGreaterThan(affectedModes[i].Mode, affectedModes[j].Mode)
- })
- csNotice(rb, fmt.Sprintf(client.t("Channel %[1]s has %[2]d persistent modes set"), channelName, len(affectedModes)))
- for _, modeChange := range affectedModes {
- csNotice(rb, fmt.Sprintf(client.t("Account %[1]s receives mode +%[2]s"), modeChange.Arg, string(modeChange.Mode)))
- }
- case modes.Add, modes.Remove:
- if len(affectedModes) > 0 {
- csNotice(rb, fmt.Sprintf(client.t("Successfully set persistent mode %s%s on %s"), string(change.Op), string(change.Mode), change.Arg))
- // #729: apply change to current membership
- for _, member := range channel.Members() {
- if member.Account() == change.Arg {
- applied, change := channel.applyModeToMember(client, change, rb)
- if applied {
- announceCmodeChanges(channel, modes.ModeChanges{change}, chanservMask, rb)
- }
- }
- }
- } else {
- csNotice(rb, client.t("No changes were made"))
- }
- }
- }
-
- func csOpHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- channelInfo := server.channels.Get(params[0])
- if channelInfo == nil {
- csNotice(rb, client.t("Channel does not exist"))
- return
- }
- channelName := channelInfo.Name()
-
- clientAccount := client.Account()
- if clientAccount == "" || clientAccount != channelInfo.Founder() {
- csNotice(rb, client.t("Only the channel founder can do this"))
- return
- }
-
- var target *Client
- if len(params) > 1 {
- target = server.clients.Get(params[1])
- if target == nil {
- csNotice(rb, client.t("Could not find given client"))
- return
- }
- } else {
- target = client
- }
-
- // give them privs
- givenMode := modes.ChannelOperator
- if clientAccount == target.Account() {
- givenMode = modes.ChannelFounder
- }
- applied, change := channelInfo.applyModeToMember(client,
- modes.ModeChange{Mode: givenMode,
- Op: modes.Add,
- Arg: target.NickCasefolded(),
- },
- rb)
- if applied {
- announceCmodeChanges(channelInfo, modes.ModeChanges{change}, chanservMask, rb)
- }
-
- csNotice(rb, fmt.Sprintf(client.t("Successfully op'd in channel %s"), channelName))
-
- tnick := target.Nick()
- server.logger.Info("services", fmt.Sprintf("Client %s op'd [%s] in channel %s", client.Nick(), tnick, channelName))
- server.snomasks.Send(sno.LocalChannels, fmt.Sprintf(ircfmt.Unescape("Client $c[grey][$r%s$c[grey]] CS OP'd $c[grey][$r%s$c[grey]] in channel $c[grey][$r%s$c[grey]]"), client.NickMaskString(), tnick, channelName))
- }
-
- func csRegisterHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- if server.Config().Channels.Registration.OperatorOnly && !client.HasRoleCapabs("chanreg") {
- csNotice(rb, client.t("Channel registration is restricted to server operators"))
- return
- }
- channelName := params[0]
- channelInfo := server.channels.Get(channelName)
- if channelInfo == nil {
- csNotice(rb, client.t("No such channel"))
- return
- }
- if !channelInfo.ClientIsAtLeast(client, modes.ChannelOperator) {
- csNotice(rb, client.t("You must be an oper on the channel to register it"))
- return
- }
-
- account := client.Account()
- if !checkChanLimit(client, rb) {
- return
- }
-
- // this provides the synchronization that allows exactly one registration of the channel:
- err := server.channels.SetRegistered(channelName, account)
- if err != nil {
- csNotice(rb, err.Error())
- return
- }
-
- csNotice(rb, fmt.Sprintf(client.t("Channel %s successfully registered"), channelName))
-
- server.logger.Info("services", fmt.Sprintf("Client %s registered channel %s", client.Nick(), channelName))
- server.snomasks.Send(sno.LocalChannels, fmt.Sprintf(ircfmt.Unescape("Channel registered $c[grey][$r%s$c[grey]] by $c[grey][$r%s$c[grey]]"), channelName, client.nickMaskString))
-
- // give them founder privs
- applied, change := channelInfo.applyModeToMember(client,
- modes.ModeChange{
- Mode: modes.ChannelFounder,
- Op: modes.Add,
- Arg: client.NickCasefolded(),
- },
- rb)
- if applied {
- announceCmodeChanges(channelInfo, modes.ModeChanges{change}, chanservMask, rb)
- }
- }
-
- // check whether a client has already registered too many channels
- func checkChanLimit(client *Client, rb *ResponseBuffer) (ok bool) {
- account := client.Account()
- channelsAlreadyRegistered := client.server.accounts.ChannelsForAccount(account)
- ok = len(channelsAlreadyRegistered) < client.server.Config().Channels.Registration.MaxChannelsPerAccount || client.HasRoleCapabs("chanreg")
- if !ok {
- csNotice(rb, client.t("You have already registered the maximum number of channels; try dropping some with /CS UNREGISTER"))
- }
- return
- }
-
- func csPrivsCheck(channel RegisteredChannel, client *Client, rb *ResponseBuffer) (success bool) {
- founder := channel.Founder
- if founder == "" {
- csNotice(rb, client.t("That channel is not registered"))
- return false
- }
- if client.HasRoleCapabs("chanreg") {
- return true
- }
- if founder != client.Account() {
- csNotice(rb, client.t("Insufficient privileges"))
- return false
- }
- return true
- }
-
- func csUnregisterHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- channelName := params[0]
- var verificationCode string
- if len(params) > 1 {
- verificationCode = params[1]
- }
-
- channel := server.channels.Get(channelName)
- if channel == nil {
- csNotice(rb, client.t("No such channel"))
- return
- }
-
- info := channel.ExportRegistration(0)
- channelKey := info.NameCasefolded
- if !csPrivsCheck(info, client, rb) {
- return
- }
-
- expectedCode := utils.ConfirmationCode(info.Name, info.RegisteredAt)
- if expectedCode != verificationCode {
- csNotice(rb, ircfmt.Unescape(client.t("$bWarning: unregistering this channel will remove all stored channel attributes.$b")))
- csNotice(rb, fmt.Sprintf(client.t("To confirm channel unregistration, type: /CS UNREGISTER %[1]s %[2]s"), channelKey, expectedCode))
- return
- }
-
- server.channels.SetUnregistered(channelKey, info.Founder)
- csNotice(rb, fmt.Sprintf(client.t("Channel %s is now unregistered"), channelKey))
- }
-
- func csClearHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- channel := server.channels.Get(params[0])
- if channel == nil {
- csNotice(rb, client.t("Channel does not exist"))
- return
- }
- if !csPrivsCheck(channel.ExportRegistration(0), client, rb) {
- return
- }
-
- switch strings.ToLower(params[1]) {
- case "access":
- channel.resetAccess()
- csNotice(rb, client.t("Successfully reset channel access"))
- case "users":
- for _, target := range channel.Members() {
- if target != client {
- channel.Kick(client, target, "Cleared by ChanServ", rb, true)
- }
- }
- default:
- csNotice(rb, client.t("Invalid parameters"))
- }
-
- }
-
- func csTransferHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- if strings.ToLower(params[0]) == "accept" {
- processTransferAccept(client, params[1], rb)
- return
- }
- chname := params[0]
- channel := server.channels.Get(chname)
- if channel == nil {
- csNotice(rb, client.t("Channel does not exist"))
- return
- }
- regInfo := channel.ExportRegistration(0)
- chname = regInfo.Name
- account := client.Account()
- isFounder := account != "" && account == regInfo.Founder
- hasPrivs := client.HasRoleCapabs("chanreg")
- if !(isFounder || hasPrivs) {
- csNotice(rb, client.t("Insufficient privileges"))
- return
- }
- target := params[1]
- targetAccount, err := server.accounts.LoadAccount(params[1])
- if err != nil {
- csNotice(rb, client.t("Account does not exist"))
- return
- }
- if targetAccount.NameCasefolded != account {
- expectedCode := utils.ConfirmationCode(regInfo.Name, regInfo.RegisteredAt)
- codeValidated := 2 < len(params) && params[2] == expectedCode
- if !codeValidated {
- csNotice(rb, ircfmt.Unescape(client.t("$bWarning: you are about to transfer control of your channel to another user.$b")))
- csNotice(rb, fmt.Sprintf(client.t("To confirm your channel transfer, type: /CS TRANSFER %[1]s %[2]s %[3]s"), chname, target, expectedCode))
- return
- }
- }
- status, err := channel.Transfer(client, target, hasPrivs)
- if err == nil {
- switch status {
- case channelTransferComplete:
- csNotice(rb, fmt.Sprintf(client.t("Successfully transferred channel %[1]s to account %[2]s"), chname, target))
- case channelTransferPending:
- sendTransferPendingNotice(server, target, chname)
- csNotice(rb, fmt.Sprintf(client.t("Transfer of channel %[1]s to account %[2]s succeeded, pending acceptance"), chname, target))
- case channelTransferCancelled:
- csNotice(rb, fmt.Sprintf(client.t("Cancelled pending transfer of channel %s"), chname))
- }
- } else {
- csNotice(rb, client.t("Could not transfer channel"))
- }
- }
-
- func sendTransferPendingNotice(server *Server, account, chname string) {
- clients := server.accounts.AccountToClients(account)
- if len(clients) == 0 {
- return
- }
- var client *Client
- for _, candidate := range clients {
- client = candidate
- if candidate.NickCasefolded() == candidate.Account() {
- break // prefer the login where the nick is the account
- }
- }
- client.Send(nil, chanservMask, "NOTICE", client.Nick(), fmt.Sprintf(client.t("You have been offered ownership of channel %[1]s. To accept, /CS TRANSFER ACCEPT %[1]s"), chname))
- }
-
- func processTransferAccept(client *Client, chname string, rb *ResponseBuffer) {
- channel := client.server.channels.Get(chname)
- if channel == nil {
- csNotice(rb, client.t("Channel does not exist"))
- return
- }
- if !checkChanLimit(client, rb) {
- return
- }
- switch channel.AcceptTransfer(client) {
- case nil:
- csNotice(rb, fmt.Sprintf(client.t("Successfully accepted ownership of channel %s"), channel.Name()))
- case errChannelTransferNotOffered:
- csNotice(rb, fmt.Sprintf(client.t("You weren't offered ownership of channel %s"), channel.Name()))
- default:
- csNotice(rb, fmt.Sprintf(client.t("Could not accept ownership of channel %s"), channel.Name()))
- }
- }
-
- func csPurgeHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- oper := client.Oper()
- if oper == nil {
- return // should be impossible because you need oper capabs for this
- }
-
- chname := params[0]
- var reason string
- if 1 < len(params) {
- reason = params[1]
- }
- purgeRecord := ChannelPurgeRecord{
- Oper: oper.Name,
- PurgedAt: time.Now().UTC(),
- Reason: reason,
- }
- switch server.channels.Purge(chname, purgeRecord) {
- case nil:
- channel := server.channels.Get(chname)
- if channel != nil { // channel need not exist to be purged
- for _, target := range channel.Members() {
- channel.Kick(client, target, "Cleared by ChanServ", rb, true)
- }
- }
- csNotice(rb, fmt.Sprintf(client.t("Successfully purged channel %s from the server"), chname))
- case errInvalidChannelName:
- csNotice(rb, fmt.Sprintf(client.t("Can't purge invalid channel %s"), chname))
- default:
- csNotice(rb, client.t("An error occurred"))
- }
- }
-
- func csUnpurgeHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- chname := params[0]
- switch server.channels.Unpurge(chname) {
- case nil:
- csNotice(rb, fmt.Sprintf(client.t("Successfully unpurged channel %s from the server"), chname))
- case errNoSuchChannel:
- csNotice(rb, fmt.Sprintf(client.t("Channel %s wasn't previously purged from the server"), chname))
- default:
- csNotice(rb, client.t("An error occurred"))
- }
- }
-
- func csInfoHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- chname, err := CasefoldChannel(params[0])
- if err != nil {
- csNotice(rb, client.t("Invalid channel name"))
- return
- }
-
- // purge status
- if client.HasRoleCapabs("chanreg") {
- purgeRecord, err := server.channelRegistry.LoadPurgeRecord(chname)
- if err == nil {
- csNotice(rb, fmt.Sprintf(client.t("Channel %s was purged by the server operators and cannot be used"), chname))
- csNotice(rb, fmt.Sprintf(client.t("Purged by operator: %s"), purgeRecord.Oper))
- csNotice(rb, fmt.Sprintf(client.t("Purged at: %s"), purgeRecord.PurgedAt.Format(time.RFC1123)))
- if purgeRecord.Reason != "" {
- csNotice(rb, fmt.Sprintf(client.t("Purge reason: %s"), purgeRecord.Reason))
- }
- }
- } else {
- if server.channels.IsPurged(chname) {
- csNotice(rb, fmt.Sprintf(client.t("Channel %s was purged by the server operators and cannot be used"), chname))
- }
- }
-
- var chinfo RegisteredChannel
- channel := server.channels.Get(params[0])
- if channel != nil {
- chinfo = channel.ExportRegistration(0)
- } else {
- chinfo, err = server.channelRegistry.LoadChannel(chname)
- if err != nil && !(err == errNoSuchChannel || err == errFeatureDisabled) {
- csNotice(rb, client.t("An error occurred"))
- return
- }
- }
-
- // channel exists but is unregistered, or doesn't exist:
- if chinfo.Founder == "" {
- csNotice(rb, fmt.Sprintf(client.t("Channel %s is not registered"), chname))
- return
- }
- csNotice(rb, fmt.Sprintf(client.t("Channel %s is registered"), chinfo.Name))
- csNotice(rb, fmt.Sprintf(client.t("Founder: %s"), chinfo.Founder))
- csNotice(rb, fmt.Sprintf(client.t("Registered at: %s"), chinfo.RegisteredAt.Format(time.RFC1123)))
- }
-
- func displayChannelSetting(settingName string, settings ChannelSettings, client *Client, rb *ResponseBuffer) {
- config := client.server.Config()
-
- switch strings.ToLower(settingName) {
- case "history":
- effectiveValue := historyEnabled(config.History.Persistent.RegisteredChannels, settings.History)
- csNotice(rb, fmt.Sprintf(client.t("The stored channel history setting is: %s"), historyStatusToString(settings.History)))
- csNotice(rb, fmt.Sprintf(client.t("Given current server settings, the channel history setting is: %s"), historyStatusToString(effectiveValue)))
- default:
- csNotice(rb, client.t("Invalid params"))
- }
- }
-
- func csGetHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- chname, setting := params[0], params[1]
- channel := server.channels.Get(chname)
- if channel == nil {
- csNotice(rb, client.t("No such channel"))
- return
- }
- info := channel.ExportRegistration(IncludeSettings)
- if !csPrivsCheck(info, client, rb) {
- return
- }
-
- displayChannelSetting(setting, info.Settings, client, rb)
- }
-
- func csSetHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
- chname, setting, value := params[0], params[1], params[2]
- channel := server.channels.Get(chname)
- if channel == nil {
- csNotice(rb, client.t("No such channel"))
- return
- }
- info := channel.ExportRegistration(IncludeSettings)
- settings := info.Settings
- if !csPrivsCheck(info, client, rb) {
- return
- }
-
- var err error
- switch strings.ToLower(setting) {
- case "history":
- settings.History, err = historyStatusFromString(value)
- if err != nil {
- err = errInvalidParams
- break
- }
- channel.SetSettings(settings)
- channel.resizeHistory(server.Config())
- }
-
- switch err {
- case nil:
- csNotice(rb, client.t("Successfully changed the channel settings"))
- displayChannelSetting(setting, settings, client, rb)
- case errInvalidParams:
- csNotice(rb, client.t("Invalid parameters"))
- default:
- server.logger.Error("internal", "CS SET error:", err.Error())
- csNotice(rb, client.t("An error occurred"))
- }
- }
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