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annotate mod_muc_markers/mod_muc_markers.lua @ 4251:d33b480befcb

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mod_rest: Fix attempt at indexing nil if an error stanza is missing <error>
author Kim Alvefur <zash@zash.se>
date Sun, 15 Nov 2020 16:31:08 +0100
parents 8e28d0918abc
children 020dd0a59f1f
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1 -- Track messages received by users of the MUC
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2
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3 -- We rewrite the 'id' attribute of outgoing stanzas to match the stanza (archive) id
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4 -- This module is therefore incompatible with the muc#stable_id feature
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5 -- We rewrite the id because XEP-0333 doesn't tell clients explicitly which id to use
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6 -- in marker reports. However it implies the 'id' attribute through examples, and this
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7 -- is what some clients implement.
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8 -- Notably Conversations will ack the origin-id instead. We need to update the XEP to
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9 -- clarify the correct behaviour.
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10
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11 local set = require "util.set";
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12 local st = require "util.stanza";
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13
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14 local xmlns_markers = "urn:xmpp:chat-markers:0";
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16 local marker_order = { "received", "displayed", "acknowledged" };
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17
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18 -- Add reverse mapping
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19 for priority, name in ipairs(marker_order) do
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20 marker_order[name] = priority;
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21 end
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22
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23 local marker_element_name = module:get_option_string("muc_marker_type", "displayed");
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25 assert(marker_order[marker_element_name], "invalid marker name: "..marker_element_name);
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26
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27 local marker_element_names = set.new();
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28
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29 -- "displayed" implies "received", etc. so we'll add the
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30 -- chosen marker and any "higher" ones to the set
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31 for i = marker_order[marker_element_name], #marker_order do
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32 marker_element_names:add(marker_order[i]);
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33 end
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34
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35 local muc_marker_map_store = module:open_store("muc_markers", "map");
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36
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37 local function get_stanza_id(stanza, by_jid)
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38 for tag in stanza:childtags("stanza-id", "urn:xmpp:sid:0") do
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39 if tag.attr.by == by_jid then
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40 return tag.attr.id;
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41 end
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42 end
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43 return nil;
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44 end
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45
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46 module:hook("muc-broadcast-message", function (event)
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47 local stanza = event.stanza;
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48
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49 local archive_id = get_stanza_id(stanza, event.room.jid);
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50 -- We are not interested in stanzas that didn't get archived
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51 if not archive_id then return; end
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52
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53 -- Add stanza id as id attribute
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54 stanza.attr.id = archive_id;
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55 -- Add markable element to request markers from clients
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56 stanza:tag("markable", { xmlns = xmlns_markers }):up();
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57 end, -1);
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58
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59 module:hook("muc-occupant-groupchat", function (event)
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60 local marker = event.stanza:child_with_ns(xmlns_markers);
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61 if not marker or not marker_element_names:contains(marker.name) then
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62 return; -- No marker, or not one we are interested in
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63 end
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64
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65 -- Store the id that the user has received to
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66 module:log("warn", "New marker for %s in %s: %s", event.occupant.bare_jid, event.room.jid, marker.attr.id);
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67 muc_marker_map_store:set(event.occupant.bare_jid, event.room.jid, marker.attr.id);
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68
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69 end);
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70
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71 module:hook("muc-message-is-historic", function (event)
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72 local marker = event.stanza:get_child(nil, xmlns_markers)
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73
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74 -- Prevent stanza from reaching the archive (it's just noise)
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75 if marker and marker_element_names:contains(marker.name) then
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76 return false
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77 end
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78 end);
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79
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80 local function find_nickname(room, user_jid)
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81 -- Find their current nickname
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82 for nick, occupant in pairs(room._occupants) do
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83 if occupant.bare_jid == user_jid then
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84 return nick;
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85 end
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86 end
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87 -- Or if they're not here
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88 local nickname = room:get_affiliation_data(user_jid, "reserved_nickname");
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89 if nickname then return room.jid.."/"..nickname; end
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90 end
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91
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92 -- Synthesize markers
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93 if muc_marker_map_store.get_all then
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94 module:hook("muc-occupant-session-new", function (event)
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95 local room, to = event.room, event.stanza.attr.from;
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96 local markers = muc_marker_map_store:get_all(room.jid);
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97 if not markers then return end
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98 for user_jid, id in pairs(markers) do
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99 local room_nick = find_nickname(room, user_jid);
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100 if room_nick then
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101 local recv_marker = st.message({ type = "groupchat", from = room_nick, to = to })
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102 :tag(marker_element_name, { xmlns = xmlns_markers, id = id });
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103 room:route_stanza(recv_marker);
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104 end
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105 end
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106 end);
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107 end
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108
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109 -- Public API
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110 --luacheck: ignore 131
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111
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112 function get_user_read_marker(user_jid, room_jid)
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113 return muc_marker_map_store:get(user_jid, room_jid);
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114 end
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115
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116 function is_markable(stanza)
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117 return not not stanza:get_child("markable", xmlns_markers);
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118 end