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annotate mod_muc_markers/mod_muc_markers.lua @ 4026:e3964f876b5d

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mod_muc_markers: Broadcast current markers on join This lets you see how far others have read upon joining without cluttering the archives with obsolete chat markers.
author Kim Alvefur <zash@zash.se>
date Tue, 05 May 2020 21:52:14 +0200
parents 57b4cdeba318
children 787fc3030087
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45c5603a6c07 mod_muc_markers: New module for server-side receipt tracking in MUCs
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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 st = require "util.stanza";
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12
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13 local xmlns_markers = "urn:xmpp:chat-markers:0";
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14
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15 local marker_element_name = module:get_option_string("muc_marker_type", "displayed");
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16
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17 local muc_marker_map_store = module:open_store("muc_markers", "map");
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19 local function get_stanza_id(stanza, by_jid)
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20 for tag in stanza:childtags("stanza-id", "urn:xmpp:sid:0") do
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21 if tag.attr.by == by_jid then
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22 return tag.attr.id;
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23 end
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24 end
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25 return nil;
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26 end
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28 module:hook("muc-broadcast-message", function (event)
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29 local stanza = event.stanza;
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30
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31 local archive_id = get_stanza_id(stanza, event.room.jid);
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32 -- We are not interested in stanzas that didn't get archived
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33 if not archive_id then return; end
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34
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35 -- Add stanza id as id attribute
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36 stanza.attr.id = archive_id;
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37 -- Add markable element to request markers from clients
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38 stanza:tag("markable", { xmlns = xmlns_markers }):up();
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39 end, -1);
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40
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41 module:hook("muc-occupant-groupchat", function (event)
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42 local marker = event.stanza:get_child(marker_element_name, xmlns_markers);
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43 if not marker then return; end
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44
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45 -- Store the id that the user has received to
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46 module:log("warn", "New marker for %s: %s", event.occupant.bare_jid, marker.attr.id);
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47 muc_marker_map_store:set(event.occupant.bare_jid, event.room.jid, marker.attr.id);
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48
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49 end);
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50
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51 module:hook("muc-message-is-historic", function (event)
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52 local marker = event.stanza:get_child("received", xmlns_markers);
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53
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54 -- Prevent stanza from reaching the archive (it's just noise)
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55 if marker then
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56 return false
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57 end
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58 end);
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59
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60 local function find_nickname(room, user_jid)
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61 -- Find their current nickname
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62 for nick, occupant in pairs(room._occupants) do
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63 if occupant.bare_jid == user_jid then
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64 return nick;
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65 end
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66 end
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67 -- Or if they're not here
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68 local nickname = room:get_affiliation_data(user_jid, "reserved_nickname");
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69 if nickname then return room.jid.."/"..nickname; end
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70 end
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71
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72 -- Synthesize markers
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73 if muc_marker_map_store.get_all then
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74 module:hook("muc-occupant-session-new", function (event)
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75 local room, to = event.room, event.stanza.attr.from;
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76 local markers = muc_marker_map_store:get_all(room.jid);
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77 if not markers then return end
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78 for user_jid, id in pairs(markers) do
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79 local room_nick = find_nickname(room, user_jid);
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80 if room_nick then
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81 local recv_marker = st.message({ type = "groupchat", from = room_nick, to = to })
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82 :tag("received", { xmlns = xmlns_markers, id = id });
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83 room:route_stanza(recv_marker);
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84 end
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85 end
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86 end);
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87 end
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88
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89 -- Public API
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90
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91 function get_user_read_marker(user_jid, room_jid)
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92 return muc_marker_map_store:get(user_jid, room_jid);
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93 end