prosody
43b43e7156b8
plugins/muc/subject.lib.lua

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plugins/muc/subject.lib.lua @ 11245:43b43e7156b8

MUC: Add support for presence probes (fixes #1535) The following patch allows Prosody to respond to `probe` presences and send out the probed occupant's current presence. This is based on line 17.3 in XEP-0045: A MUC service MAY handle presence probes sent to the room JID <room@service> or an occupant JID <room@service/nick> (e.g, these might be sent by an occupant's home server to determine if the room is still online or to synchronize presence information if the user or the user's server has gone offline temporarily or has started sharing presence again, as for instance when Stanza Interception and Filtering Technology (XEP-0273) is used).
author JC Brand <jc@opkode.com>
date Sun, 19 Apr 2020 21:49:45 +0200
parent 11141:a5acd6354845
child 12977:74b9e05af71e
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 -- Copyright (C) 2014 Daurnimator
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9
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10 local st = require "util.stanza";
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11 local dt = require "util.datetime";
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12
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13 local muc_util = module:require "muc/util";
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14 local valid_roles = muc_util.valid_roles;
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15
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16 local function create_subject_message(from, subject)
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17 return st.message({from = from; type = "groupchat"})
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18 :tag("subject"):text(subject or ""):up();
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19 end
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20
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21 local function get_changesubject(room)
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22 return room._data.changesubject;
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23 end
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24
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25 local function set_changesubject(room, changesubject)
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26 changesubject = changesubject and true or nil;
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27 if get_changesubject(room) == changesubject then return false; end
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28 room._data.changesubject = changesubject;
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29 return true;
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30 end
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31
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32 module:hook("muc-disco#info", function (event)
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33 table.insert(event.form, {
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34 name = "muc#roomconfig_changesubject";
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35 type = "boolean";
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36 });
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37 event.formdata["muc#roomconfig_changesubject"] = get_changesubject(event.room);
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38 end);
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39
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40 module:hook("muc-config-form", function(event)
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41 table.insert(event.form, {
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42 name = "muc#roomconfig_changesubject";
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43 type = "boolean";
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44 label = "Allow anyone to set the room's subject";
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45 desc = "Choose whether anyone, or only moderators, may set the room's subject";
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46 value = get_changesubject(event.room);
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47 });
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48 end, 80-1);
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49
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50 module:hook("muc-config-submitted/muc#roomconfig_changesubject", function(event)
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51 if set_changesubject(event.room, event.value) then
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52 event.status_codes["104"] = true;
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53 end
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54 end);
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55
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56 local function get_subject(room)
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57 -- a <message/> stanza from the room JID (or from the occupant JID of the entity that set the subject)
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58 return room._data.subject_from or room.jid, room._data.subject;
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59 end
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60
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61 local function send_subject(room, to, time)
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62 local msg = create_subject_message(get_subject(room));
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63 msg.attr.to = to;
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64 if time then
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65 msg:tag("delay", {
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66 xmlns = "urn:xmpp:delay",
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67 from = room.jid,
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68 stamp = dt.datetime(time);
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69 }):up();
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70 end
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71 room:route_stanza(msg);
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72 end
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73
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74 local function set_subject(room, from, subject)
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75 if subject == "" then subject = nil; end
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76 local old_from, old_subject = get_subject(room);
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77 if old_subject == subject and old_from == from then return false; end
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78 room._data.subject_from = from;
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79 room._data.subject = subject;
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80 room._data.subject_time = os.time();
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81 local msg = create_subject_message(from, subject);
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82 room:broadcast_message(msg);
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83 return true;
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84 end
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85
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86 -- Send subject to joining user
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87 module:hook("muc-occupant-session-new", function(event)
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88 send_subject(event.room, event.stanza.attr.from, event.room._data.subject_time);
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89 end, 20);
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90
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91 -- Prosody has made the decision that messages with <subject/> are exclusively subject changes
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92 -- e.g. body will be ignored; even if the subject change was not allowed
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93 module:hook("muc-occupant-groupchat", function(event)
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94 local stanza = event.stanza;
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95 local subject = stanza:get_child("subject");
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96 if subject then
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97 if stanza:get_child("body") or stanza:get_child("thread") then
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98 -- Note: A message with a <subject/> and a <body/> or a <subject/> and
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99 -- a <thread/> is a legitimate message, but it SHALL NOT be interpreted
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100 -- as a subject change.
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101 return;
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102 end
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103 local room = event.room;
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104 local occupant = event.occupant;
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105 -- Role check for subject changes
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106 local role_rank = valid_roles[occupant and occupant.role or "none"];
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107 if role_rank >= valid_roles.moderator or
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108 ( role_rank >= valid_roles.participant and get_changesubject(room) ) then -- and participant
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109 set_subject(room, occupant.nick, subject:get_text());
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110 room:save();
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111 return true;
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112 else
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113 event.origin.send(st.error_reply(stanza, "auth", "forbidden", "You are not allowed to change the subject"));
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114 return true;
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115 end
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116 end
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117 end, 20);
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118
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119 return {
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120 get_changesubject = get_changesubject;
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121 set_changesubject = set_changesubject;
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122 get = get_subject;
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123 set = set_subject;
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124 send = send_subject;
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125 };