Mercurial > prosody-modules

annotate mod_muc_restrict_media/mod_muc_restrict_media.lua @ 5173:460f78654864

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mod_muc_rtbl: also filter messages This was a bit tricky because we don't want to run the JIDs through SHA256 on each message. Took a while to come up with this simple plan of just caching the SHA256 of the JIDs on the occupants. This will leave some dirt in the occupants after unloading the module, but that should be ok; once they cycle the room, the hashes will be gone. This is direly needed, otherwise, there is a tight race between the moderation activities and the actors joining the room.
author Jonas Schäfer <jonas@wielicki.name>
date Tue, 21 Feb 2023 21:37:27 +0100
parents 1682166171ff
children
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1 module:depends"muc";
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2
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3 local restrict_by_default = module:get_option_boolean("muc_room_default_restrict_media", true);
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4
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5 local function should_restrict_media(room)
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6 local restrict_media = room._data.restrict_media;
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7 if restrict_media == nil then
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8 restrict_media = restrict_by_default;
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9 end
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10 return restrict_media;
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11 end
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12
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13 module:hook("muc-config-form", function(event)
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14 local room, form = event.room, event.form;
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15 table.insert(form, {
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16 name = "{xmpp:prosody.im}muc#roomconfig_unaffiliated_media",
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17 type = "boolean",
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18 label = "Display inline media (images, etc.) from non-members",
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19 value = not should_restrict_media(room),
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20 });
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21 end);
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22
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23 module:hook("muc-config-submitted", function(event)
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24 local room, fields, changed = event.room, event.fields, event.changed;
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25 local new_restrict_media = not fields["{xmpp:prosody.im}muc#roomconfig_unaffiliated_media"];
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26 if new_restrict_media ~= should_restrict_media(room) then
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27 if new_restrict_media == restrict_by_default then
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28 room._data.restrict_media = nil;
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29 else
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30 room._data.restrict_media = new_restrict_media;
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31 end
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32 if type(changed) == "table" then
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33 changed["{xmpp:prosody.im}muc#roomconfig_unaffiliated_media"] = true;
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34 else
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35 event.changed = true;
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36 end
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37 end
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38 end);
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39
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40 module:hook("muc-disco#info", function (event)
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41 local room, form, formdata = event.room, event.form, event.formdata;
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42
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43 local allow_unaffiliated_media = not should_restrict_media(room);
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44 table.insert(form, {
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45 name = "{xmpp:prosody.im}muc#roomconfig_unaffiliated_media",
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46 type = "boolean",
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47 });
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48 formdata["{xmpp:prosody.im}muc#roomconfig_unaffiliated_media"] = allow_unaffiliated_media;
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49 end);
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50
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51 local function strip_xhtml_img(tag)
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52 if tag.attr.xmlns == "http://www.w3.org/1999/xhtml" and tag.name == "img" then
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53 tag.name = "i";
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54 tag:text(tag.attr.alt or "<image blocked>");
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55 tag.attr = { xmlns = tag.attr.xmlns, title = tag.attr.title };
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56 tag:maptags(strip_xhtml_img);
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57 else
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58 tag:maptags(strip_xhtml_img);
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59 end
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60
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61 return tag;
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62 end
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63
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64 local function filter_media_tags(tag)
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65 local xmlns = tag.attr.xmlns;
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66 if xmlns == "jabber:x:oob" then
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67 return nil;
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68 elseif xmlns == "urn:xmpp:reference:0" then
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69 if tag:get_child("media-sharing", "urn:xmpp:sims:1") then
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70 return nil;
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71 end
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72 elseif xmlns == "http://jabber.org/protocol/xhtml-im" then
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73 return strip_xhtml_img(tag);
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74 end
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75 return tag;
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76 end
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77
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78 module:hook("muc-occupant-groupchat", function (event)
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79 local stanza = event.stanza;
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80 if stanza.attr.type ~= "groupchat" then return; end
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81 if event.room:get_affiliation(stanza.attr.from) then return end
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82 if should_restrict_media(event.room) then
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83 stanza:maptags(filter_media_tags);
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84 end
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85 end, 20);