File

+
−-- Prosody IM
+
−-- Copyright (C) 2008-2010 Matthew Wild
+
−-- Copyright (C) 2008-2010 Waqas Hussain
+
−--
+
−-- This project is MIT/X11 licensed. Please see the
+
−-- COPYING file in the source package for more information.
+
−--
+
−
+
−local base64 = require "util.encodings".base64.encode;
+
−local sha1 = require "util.hashes".sha1;
+
−
+
−local t_insert, t_sort, t_concat = table.insert, table.sort, table.concat;
+
−local ipairs = ipairs;
+
−
+
−local _ENV = nil;
+
−-- luacheck: std none
+
−
+
−local function calculate_hash(disco_info)
+
−	local identities, features, extensions = {}, {}, {};
+
−	for _, tag in ipairs(disco_info) do
+
−		if tag.name == "identity" then
+
−			t_insert(identities, (tag.attr.category or "").."\0"..(tag.attr.type or "").."\0"..(tag.attr["xml:lang"] or "").."\0"..(tag.attr.name or ""));
+
−		elseif tag.name == "feature" then
+
−			t_insert(features, tag.attr.var or "");
+
−		elseif tag.name == "x" and tag.attr.xmlns == "jabber:x:data" then
+
−			local form = {};
+
−			local FORM_TYPE;
+
−			for _, field in ipairs(tag.tags) do
+
−				if field.name == "field" and field.attr.var then
+
−					local values = {};
+
−					for _, val in ipairs(field.tags) do
+
−						val = #val.tags == 0 and val:get_text();
+
−						if val then t_insert(values, val); end
+
−					end
+
−					t_sort(values);
+
−					if field.attr.var == "FORM_TYPE" then
+
−						FORM_TYPE = values[1];
+
−					elseif #values > 0 then
+
−						t_insert(form, field.attr.var.."\0"..t_concat(values, "<"));
+
−					else
+
−						t_insert(form, field.attr.var);
+
−					end
+
−				end
+
−			end
+
−			t_sort(form);
+
−			form = t_concat(form, "<");
+
−			if FORM_TYPE then form = FORM_TYPE.."\0"..form; end
+
−			t_insert(extensions, form);
+
−		end
+
−	end
+
−	t_sort(identities);
+
−	t_sort(features);
+
−	t_sort(extensions);
+
−	if #identities > 0 then identities = t_concat(identities, "<"):gsub("%z", "/").."<"; else identities = ""; end
+
−	if #features > 0 then features = t_concat(features, "<").."<"; else features = ""; end
+
−	if #extensions > 0 then extensions = t_concat(extensions, "<"):gsub("%z", "<").."<"; else extensions = ""; end
+
−	local S = identities..features..extensions;
+
−	local ver = base64(sha1(S));
+
−	return ver, S;
+
−end
+
−
+
−return {
+
−	calculate_hash = calculate_hash;
+
−};