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annotate mod_muc_media_metadata/mod_muc_media_metadata.lua @ 5472:b80b6947b079

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mod_http_oauth2: Always show early errors to user Before having validated the client_id, communicating an error back to the client via redirect would make this an open redirect, so we may just as well skip past that logic, and especially the warning log message.
author Kim Alvefur <zash@zash.se>
date Thu, 18 May 2023 13:43:17 +0200
parents d4537f045a78
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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);