author | Waqas Hussain <waqas20@gmail.com> |
Wed, 25 Jan 2012 11:49:27 +0500 | |
changeset 4483 | 1dbd06eedaa4 |
parent 4482 | 722cf2680028 |
child 4484 | 0da4e0f0f0ef |
permissions | -rw-r--r-- |
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-- 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 lxp = require "lxp"; |
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local st = require "util.stanza"; |
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util.xmppstream: Optimized stanza building by bypassing the stanza API.
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local stanza_mt = st.stanza_mt; |
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util.xmppstream: A little cleanup.
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local error = error; |
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local tostring = tostring; |
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local t_insert = table.insert; |
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local t_concat = table.concat; |
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local t_remove = table.remove; |
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local setmetatable = setmetatable; |
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util.xmppstream: Reject XML comments, processing instructions and (if supported by LuaExpat) DTDs. If not supported, log a warning.
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-- COMPAT: w/LuaExpat 1.1.0 |
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local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false }); |
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module "xmppstream" |
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local new_parser = lxp.new; |
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local ns_prefixes = { |
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["http://www.w3.org/XML/1998/namespace"] = "xml"; |
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}; |
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local xmlns_streams = "http://etherx.jabber.org/streams"; |
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local ns_separator = "\1"; |
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local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$"; |
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_M.ns_separator = ns_separator; |
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_M.ns_pattern = ns_pattern; |
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function new_sax_handlers(session, stream_callbacks) |
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local xml_handlers = {}; |
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local cb_streamopened = stream_callbacks.streamopened; |
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local cb_streamclosed = stream_callbacks.streamclosed; |
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local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end; |
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local cb_handlestanza = stream_callbacks.handlestanza; |
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local stream_ns = stream_callbacks.stream_ns or xmlns_streams; |
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local stream_tag = stream_callbacks.stream_tag or "stream"; |
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if stream_ns ~= "" then |
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stream_tag = stream_ns..ns_separator..stream_tag; |
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end |
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local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error"); |
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local stream_default_ns = stream_callbacks.default_ns; |
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util.xmppstream: Optimized stanza building by bypassing the stanza API.
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local stack = {}; |
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local chardata, stanza = {}; |
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local non_streamns_depth = 0; |
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function xml_handlers:StartElement(tagname, attr) |
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if stanza and #chardata > 0 then |
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-- We have some character data in the buffer |
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t_insert(stanza, t_concat(chardata)); |
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chardata = {}; |
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end |
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local curr_ns,name = tagname:match(ns_pattern); |
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if name == "" then |
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curr_ns, name = "", curr_ns; |
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69 |
end |
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if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then |
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attr.xmlns = curr_ns; |
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non_streamns_depth = non_streamns_depth + 1; |
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74 |
end |
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75 |
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-- FIXME !!!!! |
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for i=1,#attr do |
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local k = attr[i]; |
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attr[i] = nil; |
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80 |
local ns, nm = k:match(ns_pattern); |
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if nm ~= "" then |
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ns = ns_prefixes[ns]; |
bc139431830b
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83 |
if ns then |
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84 |
attr[ns..":"..nm] = attr[k]; |
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85 |
attr[k] = nil; |
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86 |
end |
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87 |
end |
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88 |
end |
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89 |
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90 |
if not stanza then --if we are not currently inside a stanza |
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91 |
if session.notopen then |
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92 |
if tagname == stream_tag then |
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93 |
non_streamns_depth = 0; |
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94 |
if cb_streamopened then |
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95 |
cb_streamopened(session, attr); |
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96 |
end |
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97 |
else |
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98 |
-- Garbage before stream? |
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99 |
cb_error(session, "no-stream"); |
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100 |
end |
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101 |
return; |
1
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102 |
end |
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103 |
if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then |
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104 |
cb_error(session, "invalid-top-level-element"); |
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105 |
end |
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106 |
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107 |
stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt); |
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108 |
else -- we are inside a stanza, so add a tag |
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109 |
t_insert(stack, stanza); |
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110 |
local oldstanza = stanza; |
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111 |
stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt); |
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112 |
t_insert(oldstanza, stanza); |
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113 |
t_insert(oldstanza.tags, stanza); |
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114 |
end |
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115 |
end |
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116 |
function xml_handlers:CharacterData(data) |
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117 |
if stanza then |
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118 |
t_insert(chardata, data); |
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|
119 |
end |
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120 |
end |
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121 |
function xml_handlers:EndElement(tagname) |
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122 |
if non_streamns_depth > 0 then |
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123 |
non_streamns_depth = non_streamns_depth - 1; |
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124 |
end |
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125 |
if stanza then |
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126 |
if #chardata > 0 then |
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127 |
-- We have some character data in the buffer |
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128 |
t_insert(stanza, t_concat(chardata)); |
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129 |
chardata = {}; |
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130 |
end |
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131 |
-- Complete stanza |
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132 |
if #stack == 0 then |
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133 |
if tagname ~= stream_error_tag then |
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134 |
cb_handlestanza(session, stanza); |
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135 |
else |
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|
136 |
cb_error(session, "stream-error", stanza); |
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|
137 |
end |
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|
138 |
stanza = nil; |
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|
139 |
else |
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|
140 |
stanza = t_remove(stack); |
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141 |
end |
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142 |
else |
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143 |
if cb_streamclosed then |
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144 |
cb_streamclosed(session); |
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145 |
end |
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146 |
end |
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147 |
end |
4277 | 148 |
|
4288 | 149 |
local function restricted_handler(parser) |
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150 |
cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1."); |
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|
151 |
if not parser.stop or not parser:stop() then |
4288 | 152 |
error("Failed to abort parsing"); |
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153 |
end |
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154 |
end |
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155 |
|
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|
156 |
if lxp_supports_doctype then |
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|
157 |
xml_handlers.StartDoctypeDecl = restricted_handler; |
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158 |
end |
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|
159 |
xml_handlers.Comment = restricted_handler; |
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|
160 |
xml_handlers.ProcessingInstruction = restricted_handler; |
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|
161 |
|
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|
162 |
local function reset() |
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|
163 |
stanza, chardata = nil, {}; |
3987
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|
164 |
stack = {}; |
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|
165 |
end |
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|
166 |
|
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|
167 |
local function set_session(stream, new_session) |
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|
168 |
session = new_session; |
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|
169 |
end |
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|
170 |
|
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|
171 |
return xml_handlers, { reset = reset, set_session = set_session }; |
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|
172 |
end |
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|
173 |
|
2921
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|
174 |
function new(session, stream_callbacks) |
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|
175 |
local handlers, meta = new_sax_handlers(session, stream_callbacks); |
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|
176 |
local parser = new_parser(handlers, ns_separator); |
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|
177 |
local parse = parser.parse; |
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|
178 |
|
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|
179 |
return { |
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|
180 |
reset = function () |
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|
181 |
parser = new_parser(handlers, ns_separator); |
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|
182 |
parse = parser.parse; |
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|
183 |
meta.reset(); |
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|
184 |
end, |
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changeset
|
185 |
feed = function (self, data) |
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|
186 |
return parse(parser, data); |
3424
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|
187 |
end, |
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|
188 |
set_session = meta.set_session; |
3032
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|
189 |
}; |
2921
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|
190 |
end |
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|
191 |
|
2920
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util.xmppstream: Initial commit
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|
192 |
return _M; |