prosody
12e5a54907b6
util/caps.lua

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util/caps.lua @ 7918:12e5a54907b6

util.crand: Clarify that lua_error does not return
author Kim Alvefur <zash@zash.se>
date Sat, 25 Feb 2017 18:12:24 +0100
parent 6777:5de6b93d0190
child 8555:4f0f5b49bb03
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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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17 local function calculate_hash(disco_info)
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18 local identities, features, extensions = {}, {}, {};
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19 for _, tag in ipairs(disco_info) do
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20 if tag.name == "identity" then
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21 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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22 elseif tag.name == "feature" then
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23 t_insert(features, tag.attr.var or "");
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24 elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
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25 local form = {};
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26 local FORM_TYPE;
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27 for _, field in ipairs(tag.tags) do
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28 if field.name == "field" and field.attr.var then
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29 local values = {};
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30 for _, val in ipairs(field.tags) do
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31 val = #val.tags == 0 and val:get_text();
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32 if val then t_insert(values, val); end
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33 end
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34 t_sort(values);
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35 if field.attr.var == "FORM_TYPE" then
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36 FORM_TYPE = values[1];
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37 elseif #values > 0 then
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38 t_insert(form, field.attr.var.."\0"..t_concat(values, "<"));
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39 else
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40 t_insert(form, field.attr.var);
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41 end
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42 end
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43 end
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44 t_sort(form);
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45 form = t_concat(form, "<");
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46 if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
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47 t_insert(extensions, form);
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48 end
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49 end
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50 t_sort(identities);
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51 t_sort(features);
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52 t_sort(extensions);
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53 if #identities > 0 then identities = t_concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
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54 if #features > 0 then features = t_concat(features, "<").."<"; else features = ""; end
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55 if #extensions > 0 then extensions = t_concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
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56 local S = identities..features..extensions;
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57 local ver = base64(sha1(S));
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58 return ver, S;
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59 end
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60
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61 return {
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62 calculate_hash = calculate_hash;
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63 };