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annotate mod_http_avatar/mod_http_avatar.lua @ 5929:c094eabdb30f

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mod_ping_muc: Describe the client facing protocol (from XEP-0045)
author Kim Alvefur <zash@zash.se>
date Thu, 11 Jul 2024 15:14:33 +0200
parents 0f103a6e9ba4
children
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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 -- FIXME: should be a 404, but Firefox won’t display it in that case…
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33 --response.status_code = 404;
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34 response.headers.content_type = "image/svg+xml";
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35 return default_avatar;
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36 end
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37 local avatar = base64.decode(binval);
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38 local hash = sha1(avatar, true);
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39 if request.headers.if_none_match == hash then
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40 return 304;
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41 end
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42 response.headers.content_type = photo_type;
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43 response.headers.etag = hash;
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44 return avatar;
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45 end
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46
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47 module:provides("http", {
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48 route = {
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49 ["GET /*"] = get_avatar;
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50 };
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51 });