aboutsummaryrefslogtreecommitdiffstats
path: root/util/stanza.lua
blob: 16d558af04851a8c1a16a826d7a0f43c206a64f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
-- 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 t_insert      =  table.insert;
local t_concat      =  table.concat;
local t_remove      =  table.remove;
local t_concat      =  table.concat;
local s_format      = string.format;
local s_match       =  string.match;
local tostring      =      tostring;
local setmetatable  =  setmetatable;
local getmetatable  =  getmetatable;
local pairs         =         pairs;
local ipairs        =        ipairs;
local type          =          type;
local next          =          next;
local print         =         print;
local unpack        =        unpack;
local s_gsub        =   string.gsub;
local s_char        =   string.char;
local s_find        =   string.find;
local os            =            os;

local do_pretty_printing = not os.getenv("WINDIR");
local getstyle, getstring;
if do_pretty_printing then
	local ok, termcolours = pcall(require, "util.termcolours");
	if ok then
		getstyle, getstring = termcolours.getstyle, termcolours.getstring;
	else
		do_pretty_printing = nil;
	end
end

local xmlns_stanzas = "urn:ietf:params:xml:ns:xmpp-stanzas";

module "stanza"

stanza_mt = { __type = "stanza" };
stanza_mt.__index = stanza_mt;

function stanza(name, attr)
	local stanza = { name = name, attr = attr or {}, tags = {} };
	return setmetatable(stanza, stanza_mt);
end

function stanza_mt:query(xmlns)
	return self:tag("query", { xmlns = xmlns });
end

function stanza_mt:body(text, attr)
	return self:tag("body", attr):text(text);
end

function stanza_mt:tag(name, attrs)
	local s = stanza(name, attrs);
	local last_add = self.last_add;
	if not last_add then last_add = {}; self.last_add = last_add; end
	(last_add[#last_add] or self):add_direct_child(s);
	t_insert(last_add, s);
	return self;
end

function stanza_mt:text(text)
	local last_add = self.last_add;
	(last_add and last_add[#last_add] or self):add_direct_child(text);
	return self;
end

function stanza_mt:up()
	local last_add = self.last_add;
	if last_add then t_remove(last_add); end
	return self;
end

function stanza_mt:reset()
	self.last_add = nil;
	return self;
end

function stanza_mt:add_direct_child(child)
	if type(child) == "table" then
		t_insert(self.tags, child);
	end
	t_insert(self, child);
end

function stanza_mt:add_child(child)
	local last_add = self.last_add;
	(last_add and last_add[#last_add] or self):add_direct_child(child);
	return self;
end

function stanza_mt:get_child(name, xmlns)
	for _, child in ipairs(self.tags) do
		if (not name or child.name == name)
			and ((not xmlns and self.attr.xmlns == child.attr.xmlns)
				or child.attr.xmlns == xmlns) then
			
			return child;
		end
	end
end

function stanza_mt:child_with_name(name)
	for _, child in ipairs(self.tags) do
		if child.name == name then return child; end
	end
end

function stanza_mt:child_with_ns(ns)
	for _, child in ipairs(self.tags) do
		if child.attr.xmlns == ns then return child; end
	end
end

function stanza_mt:children()
	local i = 0;
	return function (a)
			i = i + 1
			return a[i];
		end, self, i;
end

function stanza_mt:matching_tags(name, xmlns)
	xmlns = xmlns or self.attr.xmlns;
	local tags = self.tags;
	local start_i, max_i = 1, #tags;
	return function ()
			for i=start_i,max_i do
				v = tags[i];
				if (not name or v.name == name)
				and (not xmlns or xmlns == v.attr.xmlns) then
					start_i = i+1;
					return v;
				end
			end
		end, tags, 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

function stanza_mt:maptags(callback)
	local tags, curr_tag = self.tags, 1;
	local n_children, n_tags = #self, #tags;
	
	local i = 1;
	while curr_tag <= n_tags do
		if self[i] == tags[curr_tag] then
			local ret = callback(self[i]);
			if ret == nil then
				t_remove(self, i);
				t_remove(tags, curr_tag);
				n_children = n_children - 1;
				n_tags = n_tags - 1;
			else
				self[i] = ret;
				tags[i] = ret;
			end
			i = i + 1;
			curr_tag = curr_tag + 1;
		end
	end
	return self;
end

local xml_escape
do
	local escape_table = { ["'"] = "&apos;", ["\""] = "&quot;", ["<"] = "&lt;", [">"] = "&gt;", ["&"] = "&amp;" };
	function xml_escape(str) return (s_gsub(str, "['&<>\"]", escape_table)); end
	_M.xml_escape = xml_escape;
end

local function _dostring(t, buf, self, xml_escape, parentns)
	local nsid = 0;
	local name = t.name
	t_insert(buf, "<"..name);
	for k, v in pairs(t.attr) do
		if s_find(k, "\1", 1, true) then
			local ns, attrk = s_match(k, "^([^\1]*)\1?(.*)$");
			nsid = nsid + 1;
			t_insert(buf, " xmlns:ns"..nsid.."='"..xml_escape(ns).."' ".."ns"..nsid..":"..attrk.."='"..xml_escape(v).."'");
		elseif not(k == "xmlns" and v == parentns) then
			t_insert(buf, " "..k.."='"..xml_escape(v).."'");
		end
	end
	local len = #t;
	if len == 0 then
		t_insert(buf, "/>");
	else
		t_insert(buf, ">");
		for n=1,len do
			local child = t[n];
			if child.name then
				self(child, buf, self, xml_escape, t.attr.xmlns);
			else
				t_insert(buf, xml_escape(child));
			end
		end
		t_insert(buf, "</"..name..">");
	end
end
function stanza_mt.__tostring(t)
	local buf = {};
	_dostring(t, buf, _dostring, xml_escape, nil);
	return t_concat(buf);
end

function stanza_mt.top_tag(t)
	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, xml_escape(tostring(v))); end end
	end
	return s_format("<%s%s>", t.name, attr_string);
end

function stanza_mt.get_text(t)
	if #t.tags == 0 then
		return t_concat(t);
	end
end

function stanza_mt.get_error(stanza)
	local type, condition, text;
	
	local error_tag = stanza:get_child("error");
	if not error_tag then
		return nil, nil, nil;
	end
	type = error_tag.attr.type;
	
	for child in error_tag:children() do
		if child.attr.xmlns == xmlns_stanzas then
			if not text and child.name == "text" then
				text = child:get_text();
			elseif not condition then
				condition = child.name;
			end
			if condition and text then
				break;
			end
		end
	end
	return type, condition or "undefined-condition", text;
end

function stanza_mt.__add(s1, s2)
	return s1:add_direct_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
	if stanza then
		local attr = stanza.attr;
		for i=1,#attr do attr[i] = nil; end
		local attrx = {};
		for att in pairs(attr) do
			if s_find(att, "|", 1, true) and not s_find(att, "\1", 1, true) then
				local ns,na = s_match(att, "^([^|]+)|(.+)$");
				attrx[ns.."\1"..na] = attr[att];
				attr[att] = nil;
			end
		end
		for a,v in pairs(attrx) do
			attr[a] = v;
		end
		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
	end
	
	return stanza;
end

function clone(stanza)
	local lookup_table = {};
	local function _copy(object)
		if type(object) ~= "table" then
			return object;
		elseif lookup_table[object] then
			return lookup_table[object];
		end
		local new_table = {};
		lookup_table[object] = new_table;
		for index, value in pairs(object) do
			new_table[_copy(index)] = _copy(value);
		end
		return setmetatable(new_table, getmetatable(object));
	end
	
	return _copy(stanza)
end

function message(attr, body)
	if not body then
		return stanza("message", attr);
	else
		return stanza("message", attr):tag("body"):text(body):up();
	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 orig.attr.type) });
end

do
	local xmpp_stanzas_attr = { xmlns = xmlns_stanzas };
	function error_reply(orig, type, condition, message)
		local t = reply(orig);
		t.attr.type = "error";
		t:tag("error", {type = type}) --COMPAT: Some day xmlns:stanzas goes here
			:tag(condition, xmpp_stanzas_attr):up();
		if (message) then t:tag("text", xmpp_stanzas_attr):text(message):up(); end
		return t; -- stanza ready for adding app-specific errors
	end
end

function presence(attr)
	return stanza("presence", attr);
end

if do_pretty_printing then
	local style_attrk = getstyle("yellow");
	local style_attrv = getstyle("red");
	local style_tagname = getstyle("red");
	local style_punc = getstyle("magenta");
	
	local attr_format = " "..getstring(style_attrk, "%s")..getstring(style_punc, "=")..getstring(style_attrv, "'%s'");
	local top_tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">");
	--local tag_format = getstring(style_punc, "<")..getstring(style_tagname, "%s").."%s"..getstring(style_punc, ">").."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">");
	local tag_format = top_tag_format.."%s"..getstring(style_punc, "</")..getstring(style_tagname, "%s")..getstring(style_punc, ">");
	function stanza_mt.pretty_print(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 .. child:pretty_print();
			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(attr_format, k, tostring(v)); end end
		end
		return s_format(tag_format, t.name, attr_string, children_text, t.name);
	end
	
	function stanza_mt.pretty_top_tag(t)
		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(attr_format, k, tostring(v)); end end
		end
		return s_format(top_tag_format, t.name, attr_string);
	end
else
	-- Sorry, fresh out of colours for you guys ;)
	stanza_mt.pretty_print = stanza_mt.__tostring;
	stanza_mt.pretty_top_tag = stanza_mt.top_tag;
end

return _M;