Mercurial > prosody-modules
annotate mod_muc_media_metadata/mod_muc_media_metadata.lua @ 4808:8a63a0daf129
mod_muc_rtbl: Sync existing list entries when first loaded
author | Matthew Wild <mwild1@gmail.com> |
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date | Mon, 06 Dec 2021 10:36:02 +0000 |
parents | d4537f045a78 |
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mod_muc_media_metadata: Module to automatically fetch metadata for posted media
Matthew Wild <mwild1@gmail.com>
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1 local async = require "util.async"; |
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mod_muc_media_metadata: Module to automatically fetch metadata for posted media
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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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mod_muc_media_metadata: Module to automatically fetch metadata for posted media
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45 local promises; |
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Matthew Wild <mwild1@gmail.com>
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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); |