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annotate mod_muc_markers/mod_muc_markers.lua @ 4056:554f64c8d0c0

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mod_muc_markers: Expose is_markable utility function to other modules
author Matthew Wild <mwild1@gmail.com>
date Thu, 02 Jul 2020 12:07:08 +0100
parents 7b6bcb91493e
children 92152437ecfe
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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 local marker_element_names = module:get_option_set("muc_marker_types", { marker_element_name });
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17
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18 local muc_marker_map_store = module:open_store("muc_markers", "map");
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20 local function get_stanza_id(stanza, by_jid)
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21 for tag in stanza:childtags("stanza-id", "urn:xmpp:sid:0") do
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22 if tag.attr.by == by_jid then
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23 return tag.attr.id;
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24 end
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25 end
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26 return nil;
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27 end
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29 module:hook("muc-broadcast-message", function (event)
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30 local stanza = event.stanza;
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31
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32 local archive_id = get_stanza_id(stanza, event.room.jid);
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33 -- We are not interested in stanzas that didn't get archived
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34 if not archive_id then return; end
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35
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36 -- Add stanza id as id attribute
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37 stanza.attr.id = archive_id;
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38 -- Add markable element to request markers from clients
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39 stanza:tag("markable", { xmlns = xmlns_markers }):up();
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40 end, -1);
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41
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42 module:hook("muc-occupant-groupchat", function (event)
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43 local marker = event.stanza:child_with_ns(xmlns_markers);
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44 if not marker or not marker_element_names:contains(marker.name) then
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45 return; -- No marker, or not one we are interested in
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46 end
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48 -- Store the id that the user has received to
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49 module:log("warn", "New marker for %s: %s", event.occupant.bare_jid, marker.attr.id);
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50 muc_marker_map_store:set(event.occupant.bare_jid, event.room.jid, marker.attr.id);
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51
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52 end);
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53
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54 module:hook("muc-message-is-historic", function (event)
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55 local marker = event.stanza:get_child("received", xmlns_markers);
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56
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57 -- Prevent stanza from reaching the archive (it's just noise)
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58 if marker then
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59 return false
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60 end
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61 end);
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62
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63 local function find_nickname(room, user_jid)
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64 -- Find their current nickname
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65 for nick, occupant in pairs(room._occupants) do
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66 if occupant.bare_jid == user_jid then
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67 return nick;
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68 end
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69 end
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70 -- Or if they're not here
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71 local nickname = room:get_affiliation_data(user_jid, "reserved_nickname");
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72 if nickname then return room.jid.."/"..nickname; end
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73 end
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74
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75 -- Synthesize markers
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76 if muc_marker_map_store.get_all then
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77 module:hook("muc-occupant-session-new", function (event)
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78 local room, to = event.room, event.stanza.attr.from;
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79 local markers = muc_marker_map_store:get_all(room.jid);
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80 if not markers then return end
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81 for user_jid, id in pairs(markers) do
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82 local room_nick = find_nickname(room, user_jid);
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83 if room_nick then
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84 local recv_marker = st.message({ type = "groupchat", from = room_nick, to = to })
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85 :tag("received", { xmlns = xmlns_markers, id = id });
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86 room:route_stanza(recv_marker);
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87 end
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88 end
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89 end);
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90 end
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91
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92 -- Public API
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93 --luacheck: ignore 131
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94
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95 function get_user_read_marker(user_jid, room_jid)
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96 return muc_marker_map_store:get(user_jid, room_jid);
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97 end
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98
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99 function is_markable(stanza)
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100 return not not stanza:get_child("markable", xmlns_markers);
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101 end