room.go

   1 /*
   2 goircd -- minimalistic simple Internet Relay Chat (IRC) server
   3 Copyright (C) 2014-2015 Sergey Matveev <stargrave@stargrave.org>
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 package main
  20
  21 import (
  22         "fmt"
  23         "log"
  24         "regexp"
  25         "sort"
  26         "strings"
  27 )
  28
  29 var (
  30         RERoom = regexp.MustCompile("^#[^\x00\x07\x0a\x0d ,:/]{1,200}$")
  31
  32         rooms map[string]*Room = make(map[string]*Room)
  33
  34         roomSinks map[*Room]chan ClientEvent = make(map[*Room]chan ClientEvent)
  35 )
  36
  37 // Sanitize room's name. It can consist of 1 to 50 ASCII symbols
  38 // with some exclusions. All room names will have "#" prefix.
  39 func RoomNameValid(name string) bool {
  40         return RERoom.MatchString(name)
  41 }
  42
  43 type Room struct {
  44         name    *string
  45         topic   *string
  46         key     *string
  47         members map[*Client]struct{}
  48 }
  49
  50 func (room Room) String() string {
  51         return *room.name
  52 }
  53
  54 func NewRoom(name string) *Room {
  55         topic := ""
  56         key := ""
  57         return &Room{
  58                 name:    &name,
  59                 topic:   &topic,
  60                 key:     &key,
  61                 members: make(map[*Client]struct{}),
  62         }
  63 }
  64
  65 func (room *Room) SendTopic(client *Client) {
  66         if *room.topic == "" {
  67                 client.ReplyNicknamed("331", *room.name, "No topic is set")
  68         } else {
  69                 client.ReplyNicknamed("332", *room.name, *room.topic)
  70         }
  71 }
  72
  73 // Send message to all room's subscribers, possibly excluding someone.
  74 func (room *Room) Broadcast(msg string, clientToIgnore ...*Client) {
  75         for member := range room.members {
  76                 if (len(clientToIgnore) > 0) && member == clientToIgnore[0] {
  77                         continue
  78                 }
  79                 member.Msg(msg)
  80         }
  81 }
  82
  83 func (room *Room) StateSave() {
  84         stateSink <- StateEvent{*room.name, *room.topic, *room.key}
  85 }
  86
  87 func (room *Room) Processor(events <-chan ClientEvent) {
  88         var client *Client
  89         for event := range events {
  90                 client = event.client
  91                 switch event.eventType {
  92                 case EventTerm:
  93                         roomsGroup.Done()
  94                         return
  95                 case EventNew:
  96                         room.members[client] = struct{}{}
  97                         if *verbose {
  98                                 log.Println(client, "joined", room.name)
  99                         }
 100                         room.SendTopic(client)
 101                         room.Broadcast(fmt.Sprintf(":%s JOIN %s", client, *room.name))
 102                         logSink <- LogEvent{*room.name, *client.nickname, "joined", true}
 103                         nicknames := make([]string, 0)
 104                         for member := range room.members {
 105                                 nicknames = append(nicknames, *member.nickname)
 106                         }
 107                         sort.Strings(nicknames)
 108                         client.ReplyNicknamed("353", "=", *room.name, strings.Join(nicknames, " "))
 109                         client.ReplyNicknamed("366", *room.name, "End of NAMES list")
 110                 case EventDel:
 111                         if _, subscribed := room.members[client]; !subscribed {
 112                                 client.ReplyNicknamed("442", *room.name, "You are not on that channel")
 113                                 continue
 114                         }
 115                         delete(room.members, client)
 116                         msg := fmt.Sprintf(":%s PART %s :%s", client, *room.name, *client.nickname)
 117                         room.Broadcast(msg)
 118                         logSink <- LogEvent{*room.name, *client.nickname, "left", true}
 119                 case EventTopic:
 120                         if _, subscribed := room.members[client]; !subscribed {
 121                                 client.ReplyParts("442", *room.name, "You are not on that channel")
 122                                 continue
 123                         }
 124                         if event.text == "" {
 125                                 room.SendTopic(client)
 126                                 continue
 127                         }
 128                         topic := strings.TrimLeft(event.text, ":")
 129                         room.topic = &topic
 130                         msg := fmt.Sprintf(":%s TOPIC %s :%s", client, *room.name, *room.topic)
 131                         room.Broadcast(msg)
 132                         logSink <- LogEvent{
 133                                 *room.name,
 134                                 *client.nickname,
 135                                 "set topic to " + *room.topic,
 136                                 true,
 137                         }
 138                         room.StateSave()
 139                 case EventWho:
 140                         for m := range room.members {
 141                                 client.ReplyNicknamed(
 142                                         "352",
 143                                         *room.name,
 144                                         *m.username,
 145                                         m.conn.RemoteAddr().String(),
 146                                         *hostname,
 147                                         *m.nickname,
 148                                         "H",
 149                                         "0 "+*m.realname,
 150                                 )
 151                         }
 152                         client.ReplyNicknamed("315", *room.name, "End of /WHO list")
 153                 case EventMode:
 154                         if event.text == "" {
 155                                 mode := "+"
 156                                 if *room.key != "" {
 157                                         mode = mode + "k"
 158                                 }
 159                                 client.Msg(fmt.Sprintf("324 %s %s %s", *client.nickname, *room.name, mode))
 160                                 continue
 161                         }
 162                         if strings.HasPrefix(event.text, "b") {
 163                                 client.ReplyNicknamed("368", *room.name, "End of channel ban list")
 164                                 continue
 165                         }
 166                         if strings.HasPrefix(event.text, "-k") || strings.HasPrefix(event.text, "+k") {
 167                                 if _, subscribed := room.members[client]; !subscribed {
 168                                         client.ReplyParts("442", *room.name, "You are not on that channel")
 169                                         continue
 170                                 }
 171                         } else {
 172                                 client.ReplyNicknamed("472", event.text, "Unknown MODE flag")
 173                                 continue
 174                         }
 175                         var msg string
 176                         var msgLog string
 177                         if strings.HasPrefix(event.text, "+k") {
 178                                 cols := strings.Split(event.text, " ")
 179                                 if len(cols) == 1 {
 180                                         client.ReplyNotEnoughParameters("MODE")
 181                                         continue
 182                                 }
 183                                 room.key = &cols[1]
 184                                 msg = fmt.Sprintf(":%s MODE %s +k %s", client, *room.name, *room.key)
 185                                 msgLog = "set channel key to " + *room.key
 186                         } else {
 187                                 key := ""
 188                                 room.key = &key
 189                                 msg = fmt.Sprintf(":%s MODE %s -k", client, *room.name)
 190                                 msgLog = "removed channel key"
 191                         }
 192                         room.Broadcast(msg)
 193                         logSink <- LogEvent{*room.name, *client.nickname, msgLog, true}
 194                         room.StateSave()
 195                 case EventMsg:
 196                         sep := strings.Index(event.text, " ")
 197                         room.Broadcast(fmt.Sprintf(
 198                                 ":%s %s %s :%s",
 199                                 client,
 200                                 event.text[:sep],
 201                                 *room.name,
 202                                 event.text[sep+1:]),
 203                                 client,
 204                         )
 205                         logSink <- LogEvent{
 206                                 *room.name,
 207                                 *client.nickname,
 208                                 event.text[sep+1:],
 209                                 false,
 210                         }
 211                 }
 212         }
 213 }