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annotate mod_muc_media_metadata/mod_muc_media_metadata.lua @ 5342:e28ba69b5307

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mod_rest: Implement use of refresh tokens in rest.sh example Because having access tokens expire daily was becoming annoying. Now this is starting to be in dire need of refactoring.
author Kim Alvefur <zash@zash.se>
date Wed, 12 Apr 2023 11:24:50 +0200
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);