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63 lines
2.1 KiB
63 lines
2.1 KiB
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local base64 = require "util.encodings".base64.encode;
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local sha1 = require "util.hashes".sha1;
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local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat;
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local ipairs = ipairs;
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local _ENV = nil;
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local function calculate_hash(disco_info)
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local identities, features, extensions = {}, {}, {};
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for _, tag in ipairs(disco_info) do
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if tag.name == "identity" then
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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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elseif tag.name == "feature" then
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t_insert(features, tag.attr.var or "");
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elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
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local form = {};
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local FORM_TYPE;
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for _, field in ipairs(tag.tags) do
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if field.name == "field" and field.attr.var then
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local values = {};
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for _, val in ipairs(field.tags) do
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val = #val.tags == 0 and val:get_text();
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if val then t_insert(values, val); end
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end
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t_sort(values);
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if field.attr.var == "FORM_TYPE" then
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FORM_TYPE = values[1];
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elseif #values > 0 then
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t_insert(form, field.attr.var.."\0"..t_concat(values, "<"));
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else
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t_insert(form, field.attr.var);
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end
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end
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end
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t_sort(form);
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form = t_concat(form, "<");
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if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
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t_insert(extensions, form);
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end
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end
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t_sort(identities);
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t_sort(features);
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t_sort(extensions);
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if #identities > 0 then identities = t_concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
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if #features > 0 then features = t_concat(features, "<").."<"; else features = ""; end
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if #extensions > 0 then extensions = t_concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
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local S = identities..features..extensions;
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local ver = base64(sha1(S));
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return ver, S;
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end
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return {
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calculate_hash = calculate_hash;
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};
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