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local t_insert = table.insert;
local t_remove = table.remove;
local s_format = string.format;
local tostring = tostring;
local setmetatable = setmetatable;
local pairs = pairs;
local ipairs = ipairs;
local type = type;
local unpack = unpack;
local s_gsub = string.gsub;
module "stanza"
stanza_mt = {};
stanza_mt.__index = stanza_mt;
function stanza(name, attr)
local stanza = { name = name, attr = attr or {}, tags = {}, last_add = {}};
return setmetatable(stanza, stanza_mt);
end
function stanza_mt:query(xmlns)
return self:tag("query", { xmlns = xmlns });
end
function stanza_mt:tag(name, attrs)
local s = stanza(name, attrs);
(self.last_add[#self.last_add] or self):add_child(s);
t_insert(self.last_add, s);
return self;
end
function stanza_mt:text(text)
(self.last_add[#self.last_add] or self):add_child(text);
return self;
end
function stanza_mt:up()
t_remove(self.last_add);
return self;
end
function stanza_mt:add_child(child)
if type(child) == "table" then
t_insert(self.tags, child);
end
t_insert(self, child);
end
function stanza_mt:child_with_name(name)
for _, child in ipairs(self) do
if child.name == name then return child; end
end
end
function stanza_mt:children()
local i = 0;
return function (a)
i = i + 1
local v = a[i]
if v then return v; end
end, self, i;
end
function stanza_mt:childtags()
local i = 0;
return function (a)
i = i + 1
local v = self.tags[i]
if v then return v; end
end, self.tags[1], i;
end
do
local xml_entities = { ["'"] = "'", ["\""] = """, ["<"] = "<", [">"] = ">", ["&"] = "&" };
function xml_escape(s) return s_gsub(s, "['&<>\"]", xml_entities); end
end
local xml_escape = xml_escape;
function stanza_mt.__tostring(t)
local children_text = "";
for n, child in ipairs(t) do
if type(child) == "string" then
children_text = children_text .. xml_escape(child);
else
children_text = children_text .. tostring(child);
end
end
local attr_string = "";
if t.attr then
for k, v in pairs(t.attr) do if type(k) == "string" then attr_string = attr_string .. s_format(" %s='%s'", k, tostring(v)); end end
end
return s_format("<%s%s>%s</%s>", t.name, attr_string, children_text, t.name);
end
function stanza_mt.__add(s1, s2)
return s1:add_child(s2);
end
do
local id = 0;
function new_id()
id = id + 1;
return "lx"..id;
end
end
function preserialize(stanza)
local s = { name = stanza.name, attr = stanza.attr };
for _, child in ipairs(stanza) do
if type(child) == "table" then
t_insert(s, preserialize(child));
else
t_insert(s, child);
end
end
return s;
end
function deserialize(stanza)
-- Set metatable
setmetatable(stanza, stanza_mt);
for _, child in ipairs(stanza) do
if type(child) == "table" then
deserialize(child);
end
end
if not stanza.tags then
-- Rebuild tags
local tags = {};
for _, child in ipairs(stanza) do
if type(child) == "table" then
t_insert(tags, child);
end
end
stanza.tags = tags;
end
return stanza;
end
function message(attr, body)
if not body then
return stanza("message", attr);
else
return stanza("message", attr):tag("body"):text(body);
end
end
function iq(attr)
if attr and not attr.id then attr.id = new_id(); end
return stanza("iq", attr or { id = new_id() });
end
function reply(orig)
return stanza(orig.name, orig.attr and { to = orig.attr.from, from = orig.attr.to, id = orig.attr.id, type = ((orig.name == "iq" and "result") or nil) });
end
function error_reply(orig, type, condition, message, clone)
local t = reply(orig);
t.attr.type = "error";
-- TODO use clone
t:tag("error", {type = type})
:tag(condition, {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
if (message) then t:tag("text"):text(message):up(); end
return t; -- stanza ready for adding app-specific errors
end
function presence(attr)
return stanza("presence", attr);
end
return _M;
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