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annotate mod_muc_media_metadata/mod_muc_media_metadata.lua @ 5824:f1e816df1f73

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mod_groups_internal: Also remove MUCs that still exist, but have been destroyed Tombstones could previously fool us into thinking the MUC was still there.
author Matthew Wild <mwild1@gmail.com>
date Fri, 12 Jan 2024 18:19:56 +0000
parents d4537f045a78
children
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47e1c94fb6fb mod_muc_media_metadata: Module to automatically fetch metadata for posted media
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1 local async = require "util.async";
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2 local promise = require "util.promise";
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3 local http = require "net.http";
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4 local st = require "util.stanza";
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5
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6 local xmlns_metadata = "xmpp:prosody.im/protocol/media-metadata#0"
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7
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8 local fetch_headers = {
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9 bytes = "content-length";
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10 type = "content-type";
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11 etag = "etag";
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12 blurhash = "blurhash";
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13 };
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14
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15 local function fetch_media_metadata(url)
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16 return promise.new(function (resolve)
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17 http.request(url, { method = "HEAD" }, function (body, code, response) --luacheck: ignore 212/body
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18 if code == 200 then
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19 local metadata = {};
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20 for metadata_name, header_name in pairs(fetch_headers) do
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21 metadata[metadata_name] = response.headers[header_name];
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22 end
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23 resolve(metadata);
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24 else
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25 resolve(nil);
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26 end
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27 end);
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28 end);
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29 end
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30
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31 local function metadata_to_tag(metadata)
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32 if not metadata then return; end
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33
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34 local metadata_tag = st.stanza("metadata", { xmlns = xmlns_metadata });
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35 for k, v in pairs(metadata) do
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36 metadata_tag:text_tag(k, v)
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37 end
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38
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39 return metadata_tag;
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40 end
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41
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42 module:hook("muc-occupant-groupchat", function (event)
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43 local stanza = event.stanza;
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44
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45 local promises;
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46
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47 for oob in stanza:childtags("x", "jabber:x:oob") do
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48 if not promises then promises = {}; end
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49 local url = oob:get_child_text("url");
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50 local p = fetch_media_metadata(url)
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51 :next(metadata_to_tag)
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52 :next(function (metadata_tag)
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53 oob:add_child(metadata_tag);
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54 end);
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55 table.insert(promises, p);
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56 end
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57
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58 if not promises then return; end
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59
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60 async.wait(promise.all(promises));
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61 end);