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
|
-- 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.
--
require "util.stanza"
local st = stanza;
local tostring = tostring;
local pairs = pairs;
local ipairs = ipairs;
local t_insert = table.insert;
local t_concat = table.concat;
local default_log = require "util.logger".init("xmlhandlers");
-- COMPAT: w/LuaExpat 1.1.0
local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false });
if not lxp_supports_doctype then
default_log("warn", "The version of LuaExpat on your system leaves Prosody "
.."vulnerable to denial-of-service attacks. You should upgrade to "
.."LuaExpat 1.1.1 or higher as soon as possible. See "
.."http://prosody.im/doc/depends#luaexpat for more information.");
end
local error = error;
module "xmlhandlers"
local ns_prefixes = {
["http://www.w3.org/XML/1998/namespace"] = "xml";
}
function init_xmlhandlers(session, stream_callbacks)
local ns_stack = { "" };
local curr_tag;
local chardata = {};
local xml_handlers = {};
local log = session.log or default_log;
local cb_streamopened = stream_callbacks.streamopened;
local cb_streamclosed = stream_callbacks.streamclosed;
local cb_error = stream_callbacks.error or function (session, e) error("XML stream error: "..tostring(e)); end;
local cb_handlestanza = stream_callbacks.handlestanza;
local stream_tag = stream_callbacks.stream_tag;
local stream_default_ns = stream_callbacks.default_ns;
local stanza
function xml_handlers:StartElement(tagname, attr)
if stanza and #chardata > 0 then
-- We have some character data in the buffer
stanza:text(t_concat(chardata));
chardata = {};
end
local curr_ns,name = tagname:match("^([^\1]*)\1?(.*)$");
if name == "" then
curr_ns, name = "", curr_ns;
end
if curr_ns ~= stream_default_ns then
attr.xmlns = curr_ns;
end
-- FIXME !!!!!
for i=1,#attr do
local k = attr[i];
attr[i] = nil;
local ns, nm = k:match("^([^\1]*)\1?(.*)$");
if nm ~= "" then
ns = ns_prefixes[ns];
if ns then
attr[ns..":"..nm] = attr[k];
attr[k] = nil;
end
end
end
if not stanza then --if we are not currently inside a stanza
if session.notopen then
if tagname == stream_tag then
if cb_streamopened then
cb_streamopened(session, attr);
end
else
-- Garbage before stream?
cb_error(session, "no-stream");
end
return;
end
if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
cb_error(session, "invalid-top-level-element");
end
stanza = st.stanza(name, attr);
curr_tag = stanza;
else -- we are inside a stanza, so add a tag
attr.xmlns = nil;
if curr_ns ~= stream_default_ns then
attr.xmlns = curr_ns;
end
stanza:tag(name, attr);
end
end
function xml_handlers:CharacterData(data)
if stanza then
t_insert(chardata, data);
end
end
function xml_handlers:EndElement(tagname)
local curr_ns,name = tagname:match("^([^\1]*)\1?(.*)$");
if name == "" then
curr_ns, name = "", curr_ns;
end
if (not stanza) or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then
if tagname == stream_tag then
if cb_streamclosed then
cb_streamclosed(session);
end
elseif name == "error" then
cb_error(session, "stream-error", stanza);
else
cb_error(session, "parse-error", "unexpected-element-close", name);
end
stanza, chardata = nil, {};
return;
end
if #chardata > 0 then
-- We have some character data in the buffer
stanza:text(t_concat(chardata));
chardata = {};
end
-- Complete stanza
if #stanza.last_add == 0 then
cb_handlestanza(session, stanza);
stanza = nil;
else
stanza:up();
end
end
local function restricted_handler(parser)
cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1.");
if not parser:stop() then
error("Failed to abort parsing");
end
end
if lxp_supports_doctype then
xml_handlers.StartDoctypeDecl = restricted_handler;
end
xml_handlers.Comment = restricted_handler;
xml_handlers.ProcessingInstruction = restricted_handler;
return xml_handlers;
end
return init_xmlhandlers;
|
