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annotate mod_http_pep_avatar/mod_http_pep_avatar.lua @ 3656:3e0f4d727825

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mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:46:43 +0200
parents 00bdecb12779
children 02d238799537
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461429e0db58 mod_http_pep_avatar: Provides PEP avatars via HTTP
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1 -- HTTP Access to PEP Avatar
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2 -- By Kim Alvefur <zash@zash.se>
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3
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4 local mod_pep = module:depends"pep";
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5
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6 local um = require "core.usermanager";
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7 local nodeprep = require "util.encodings".stringprep.nodeprep;
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8 local base64_decode = require "util.encodings".base64.decode;
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9 local urlencode = require "util.http".urlencode;
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10
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11 module:depends("http")
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12 module:provides("http", {
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13 route = {
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14 ["GET /*"] = function (event, user)
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15 if user == "" then
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16 return [[<h1>Hello from mod_http_pep_avatar</h1><p>This module provides access to public avatars of local users.</p>]];
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17 end;
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18
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19 local request, response = event.request, event.response;
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20 local actor = request.ip;
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21
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22 local prepped = nodeprep(user);
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23 if not prepped then return 400; end
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24 if prepped ~= user then
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25 response.headers.location = module:http_url() .. "/" .. urlencode(prepped);
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26 return 302;
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27 end
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28 if not um.user_exists(user, module.host) then
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29 return 404;
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30 end
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31
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32 local pep_service = mod_pep.get_pep_service(user);
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33
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34 local ok, avatar_hash, avatar_meta = pep_service:get_last_item("urn:xmpp:avatar:metadata", actor);
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35
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36 if not ok or not avatar_hash then
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37 return 404;
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38 end
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40 if avatar_hash == request.headers.if_none_match then
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41 return 304;
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42 end
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43
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44 local data_ok, avatar_data = pep_service:get_items("urn:xmpp:avatar:data", actor, avatar_hash);
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45 if not data_ok or type(avatar_data) ~= "table" or not avatar_data[avatar_hash] then
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46 return 404;
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47 end
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49 response.headers.etag = avatar_hash;
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50
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51 local info = avatar_meta.tags[1]:get_child("info");
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52 response.headers.content_type = info and info.attr.type or "application/octet-stream";
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53
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54 local data = avatar_data[avatar_hash];
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55 return base64_decode(data.tags[1]:get_text());
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56 end;
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57 }
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58 });