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annotate mod_muc_media_metadata/mod_muc_media_metadata.lua @ 5265:f845c218e52c

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mod_http_oauth2: Allow revoking a token without OAuth client credentials If you have a valid token, and you're not supposed to have it, revoking it seems the most responsible thing to do with it, so it should be allowed, while if you are supposed to have it, you should also be allowed to revoke it.
author Kim Alvefur <zash@zash.se>
date Tue, 21 Mar 2023 22:02:38 +0100
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);