prosody
5dd00f806e32
util/caps.lua

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util/caps.lua @ 12715:5dd00f806e32

util.crypto: Use Lua 5.2 API for predictable buffer size In Lua 5.3 LUAL_BUFFERSIZE is a macro computed from sizeof and is thus not known at pre-processing time, so this does not work. Since Lua 5.1 is no longer supported, we can use luaL_prepbuffsize() which is available from Lua 5.2
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 17:11:38 +0200
parent 8555:4f0f5b49bb03
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local base64 = require "util.encodings".base64.encode;
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10 local sha1 = require "util.hashes".sha1;
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12 local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat;
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13 local ipairs = ipairs;
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15 local _ENV = nil;
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16 -- luacheck: std none
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18 local function calculate_hash(disco_info)
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19 local identities, features, extensions = {}, {}, {};
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20 for _, tag in ipairs(disco_info) do
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21 if tag.name == "identity" then
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22 t_insert(identities, (tag.attr.category or "").."\0"..(tag.attr.type or "").."\0"..(tag.attr["xml:lang"] or "").."\0"..(tag.attr.name or ""));
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23 elseif tag.name == "feature" then
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24 t_insert(features, tag.attr.var or "");
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25 elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
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26 local form = {};
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27 local FORM_TYPE;
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28 for _, field in ipairs(tag.tags) do
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29 if field.name == "field" and field.attr.var then
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30 local values = {};
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31 for _, val in ipairs(field.tags) do
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32 val = #val.tags == 0 and val:get_text();
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33 if val then t_insert(values, val); end
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34 end
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35 t_sort(values);
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36 if field.attr.var == "FORM_TYPE" then
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37 FORM_TYPE = values[1];
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38 elseif #values > 0 then
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39 t_insert(form, field.attr.var.."\0"..t_concat(values, "<"));
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40 else
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41 t_insert(form, field.attr.var);
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42 end
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43 end
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44 end
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45 t_sort(form);
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46 form = t_concat(form, "<");
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47 if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
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48 t_insert(extensions, form);
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49 end
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50 end
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51 t_sort(identities);
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52 t_sort(features);
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53 t_sort(extensions);
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54 if #identities > 0 then identities = t_concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
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55 if #features > 0 then features = t_concat(features, "<").."<"; else features = ""; end
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56 if #extensions > 0 then extensions = t_concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
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57 local S = identities..features..extensions;
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58 local ver = base64(sha1(S));
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59 return ver, S;
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60 end
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61
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62 return {
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63 calculate_hash = calculate_hash;
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64 };