plugins/muc/subject.lib.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 -- Copyright (C) 2014 Daurnimator
   5 --
   6 -- This project is MIT/X11 licensed. Please see the
   7 -- COPYING file in the source package for more information.
   8 --
   9
  10 local st = require "util.stanza";
  11
  12 local muc_util = module:require "muc/util";
  13 local valid_roles = muc_util.valid_roles;
  14
  15 local function create_subject_message(from, subject)
  16         return st.message({from = from; type = "groupchat"})
  17                 :tag("subject"):text(subject):up();
  18 end
  19
  20 local function get_changesubject(room)
  21         return room._data.changesubject;
  22 end
  23
  24 local function set_changesubject(room, changesubject)
  25         changesubject = changesubject and true or nil;
  26         if get_changesubject(room) == changesubject then return false; end
  27         room._data.changesubject = changesubject;
  28         return true;
  29 end
  30
  31 module:hook("muc-config-form", function(event)
  32         table.insert(event.form, {
  33                 name = "muc#roomconfig_changesubject";
  34                 type = "boolean";
  35                 label = "Allow Occupants to Change Subject?";
  36                 value = get_changesubject(event.room);
  37         });
  38 end);
  39
  40 module:hook("muc-config-submitted/muc#roomconfig_changesubject", function(event)
  41         if set_changesubject(event.room, event.value) then
  42                 event.status_codes["104"] = true;
  43         end
  44 end);
  45
  46 local function get_subject(room)
  47         -- a <message/> stanza from the room JID (or from the occupant JID of the entity that set the subject)
  48         return room._data.subject_from or room.jid, room._data.subject;
  49 end
  50
  51 local function send_subject(room, to)
  52         local msg = create_subject_message(get_subject(room));
  53         msg.attr.to = to;
  54         room:route_stanza(msg);
  55 end
  56
  57 local function set_subject(room, from, subject)
  58         if subject == "" then subject = nil; end
  59         local old_from, old_subject = get_subject(room);
  60         if old_subject == subject and old_from == from then return false; end
  61         room._data.subject_from = from;
  62         room._data.subject = subject;
  63         local msg = create_subject_message(from, subject);
  64         room:broadcast_message(msg);
  65         return true;
  66 end
  67
  68 -- Send subject to joining user
  69 module:hook("muc-occupant-session-new", function(event)
  70         send_subject(event.room, event.stanza.attr.from);
  71 end, 20);
  72
  73 -- Prosody has made the decision that messages with <subject/> are exclusively subject changes
  74 -- e.g. body will be ignored; even if the subject change was not allowed
  75 module:hook("muc-occupant-groupchat", function(event)
  76         local stanza = event.stanza;
  77         local subject = stanza:get_child("subject");
  78         if subject then
  79                 local room = event.room;
  80                 local occupant = event.occupant;
  81                 -- Role check for subject changes
  82                 local role_rank = valid_roles[occupant and occupant.role or "none"];
  83                 if role_rank >= valid_roles.moderator or
  84                         ( role_rank >= valid_roles.participant and get_changesubject(room) ) then -- and participant
  85                         set_subject(room, occupant.nick, subject:get_text());
  86                         room:save();
  87                         return true;
  88                 else
  89                         event.origin.send(st.error_reply(stanza, "auth", "forbidden"));
  90                         return true;
  91                 end
  92         end
  93 end, 20);
  94
  95 return {
  96         get_changesubject = get_changesubject;
  97         set_changesubject = set_changesubject;
  98         get = get_subject;
  99         set = set_subject;
 100         send = send_subject;
 101 };