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annotate mod_muc_media_metadata/mod_muc_media_metadata.lua @ 5383:df11a2cbc7b7

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mod_http_oauth2: Implement RFC 7628 Proof Key for Code Exchange Likely to become mandatory in OAuth 2.1. Backwards compatible since the default 'plain' verifier would compare nil with nil if the relevant parameters are left out.
author Kim Alvefur <zash@zash.se>
date Sat, 29 Apr 2023 13:09:46 +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);