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annotate mod_http_avatar/mod_http_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 5b4e7db5943c
children 0f103a6e9ba4
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1 -- Prosody IM
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2 -- Copyright (C) 2018 Emmanuel Gil Peyrot
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6
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7 local base64 = require"util.encodings".base64;
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8 local sha1 = require"util.hashes".sha1;
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9 local st = require"util.stanza";
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10 module:depends"http";
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11
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12 local vcard_storage = module:open_store"vcard";
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13
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14 local default_avatar = [[<svg xmlns='http://www.w3.org/2000/svg' version='1.1' viewBox='0 0 150 150'>
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15 <rect width='150' height='150' fill='#888' stroke-width='1' stroke='#000'/>
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16 <text x='75' y='100' text-anchor='middle' font-size='100'>?</text>
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17 </svg>]];
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19 local function get_avatar(event, path)
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20 local request, response = event.request, event.response;
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21 local photo_type, binval;
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22 local vcard, err = vcard_storage:get(path);
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23 if vcard then
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24 vcard = st.deserialize(vcard);
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25 local photo = vcard:get_child("PHOTO", "vcard-temp");
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26 if photo then
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27 photo_type = photo:get_child_text("TYPE", "vcard-temp");
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28 binval = photo:get_child_text("BINVAL", "vcard-temp");
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29 end
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30 end
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31 if not photo_type or not binval then
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32 response.status_code = 404;
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33 response.headers.content_type = "image/svg+xml";
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34 return default_avatar;
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35 end
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36 local avatar = base64.decode(binval);
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37 local hash = sha1(avatar, true);
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38 if request.headers.if_none_match == hash then
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39 return 304;
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40 end
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41 response.headers.content_type = photo_type;
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42 response.headers.etag = hash;
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43 return avatar;
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44 end
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45
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46 module:provides("http", {
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47 route = {
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48 ["GET /*"] = get_avatar;
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49 };
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50 });