author | Kim Alvefur <zash@zash.se> |
Fri, 10 Nov 2017 05:42:32 +0100 | |
changeset 8385 | e5d00bf4a4d5 |
parent 7243 | bf8aa0d1951c |
child 8558 | 4f0f5b49bb03 |
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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local stanza_mt = st.stanza_mt; |
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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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-- COMPAT: w/LuaExpat 1.1.0 |
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local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false }); |
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local lxp_supports_xmldecl = pcall(lxp.new, { XmlDecl = false }); |
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local lxp_supports_bytecount = not not lxp.new({}).getcurrentbytecount; |
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local default_stanza_size_limit = 1024*1024*10; -- 10MB |
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local _ENV = nil; |
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local new_parser = lxp.new; |
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local xml_namespace = { |
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["http://www.w3.org/XML/1998/namespace\1lang"] = "xml:lang"; |
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["http://www.w3.org/XML/1998/namespace\1space"] = "xml:space"; |
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["http://www.w3.org/XML/1998/namespace\1base"] = "xml:base"; |
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["http://www.w3.org/XML/1998/namespace\1id"] = "xml:id"; |
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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.."?(.*)$"; |
148 | 42 |
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local function dummy_cb() end |
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local function new_sax_handlers(session, stream_callbacks, cb_handleprogress) |
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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 |
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function(_, e, stanza) |
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error("XML stream error: "..tostring(e)..(stanza and ": "..tostring(stanza) or ""),2); |
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end; |
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local cb_handlestanza = stream_callbacks.handlestanza; |
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cb_handleprogress = cb_handleprogress or dummy_cb; |
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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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local stack = {}; |
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local chardata, stanza = {}; |
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local stanza_size = 0; |
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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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73 |
t_insert(stanza, t_concat(chardata)); |
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chardata = {}; |
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75 |
end |
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76 |
local curr_ns,name = tagname:match(ns_pattern); |
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77 |
if name == "" then |
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78 |
curr_ns, name = "", curr_ns; |
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79 |
end |
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80 |
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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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83 |
non_streamns_depth = non_streamns_depth + 1; |
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84 |
end |
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85 |
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86 |
for i=1,#attr do |
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87 |
local k = attr[i]; |
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88 |
attr[i] = nil; |
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89 |
local xmlk = xml_namespace[k]; |
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90 |
if xmlk then |
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91 |
attr[xmlk] = attr[k]; |
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92 |
attr[k] = nil; |
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93 |
end |
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94 |
end |
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95 |
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96 |
if not stanza then --if we are not currently inside a stanza |
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97 |
if lxp_supports_bytecount then |
1107d66d2ab2
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98 |
stanza_size = self:getcurrentbytecount(); |
1107d66d2ab2
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99 |
end |
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100 |
if session.notopen then |
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101 |
if tagname == stream_tag then |
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102 |
non_streamns_depth = 0; |
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103 |
if cb_streamopened then |
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104 |
if lxp_supports_bytecount then |
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|
105 |
cb_handleprogress(stanza_size); |
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|
106 |
stanza_size = 0; |
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|
107 |
end |
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|
108 |
cb_streamopened(session, attr); |
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|
109 |
end |
b5e2d1919ec3
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changeset
|
110 |
else |
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changeset
|
111 |
-- Garbage before stream? |
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|
112 |
cb_error(session, "no-stream", tagname); |
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|
113 |
end |
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|
114 |
return; |
1
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|
115 |
end |
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|
116 |
if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then |
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|
117 |
cb_error(session, "invalid-top-level-element"); |
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|
118 |
end |
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changeset
|
119 |
|
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|
120 |
stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt); |
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|
121 |
else -- we are inside a stanza, so add a tag |
6042
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|
122 |
if lxp_supports_bytecount then |
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|
123 |
stanza_size = stanza_size + self:getcurrentbytecount(); |
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|
124 |
end |
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|
125 |
t_insert(stack, stanza); |
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|
126 |
local oldstanza = stanza; |
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|
127 |
stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt); |
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|
128 |
t_insert(oldstanza, stanza); |
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|
129 |
t_insert(oldstanza.tags, stanza); |
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|
130 |
end |
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|
131 |
end |
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|
132 |
if lxp_supports_xmldecl then |
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|
133 |
function xml_handlers:XmlDecl(version, encoding, standalone) |
8385
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parents:
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|
134 |
session.xml_version = version; |
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|
135 |
session.xml_encoding = encoding; |
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|
136 |
session.xml_standalone = standalone; |
6042
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|
137 |
if lxp_supports_bytecount then |
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parents:
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changeset
|
138 |
cb_handleprogress(self:getcurrentbytecount()); |
1107d66d2ab2
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changeset
|
139 |
end |
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changeset
|
140 |
end |
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util.xmppstream: Implement stanza size limiting, default limit 10MB
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parents:
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diff
changeset
|
141 |
end |
1107d66d2ab2
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parents:
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changeset
|
142 |
function xml_handlers:StartCdataSection() |
1107d66d2ab2
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changeset
|
143 |
if lxp_supports_bytecount then |
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parents:
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changeset
|
144 |
if stanza then |
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changeset
|
145 |
stanza_size = stanza_size + self:getcurrentbytecount(); |
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changeset
|
146 |
else |
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parents:
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changeset
|
147 |
cb_handleprogress(self:getcurrentbytecount()); |
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changeset
|
148 |
end |
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changeset
|
149 |
end |
1107d66d2ab2
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parents:
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changeset
|
150 |
end |
1107d66d2ab2
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parents:
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changeset
|
151 |
function xml_handlers:EndCdataSection() |
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changeset
|
152 |
if lxp_supports_bytecount then |
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parents:
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changeset
|
153 |
if stanza then |
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parents:
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changeset
|
154 |
stanza_size = stanza_size + self:getcurrentbytecount(); |
1107d66d2ab2
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parents:
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changeset
|
155 |
else |
1107d66d2ab2
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parents:
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diff
changeset
|
156 |
cb_handleprogress(self:getcurrentbytecount()); |
1107d66d2ab2
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parents:
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changeset
|
157 |
end |
1107d66d2ab2
util.xmppstream: Implement stanza size limiting, default limit 10MB
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parents:
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changeset
|
158 |
end |
1107d66d2ab2
util.xmppstream: Implement stanza size limiting, default limit 10MB
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parents:
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diff
changeset
|
159 |
end |
2492
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Waqas Hussain <waqas20@gmail.com>
parents:
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|
160 |
function xml_handlers:CharacterData(data) |
b5e2d1919ec3
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parents:
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changeset
|
161 |
if stanza then |
6042
1107d66d2ab2
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parents:
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diff
changeset
|
162 |
if lxp_supports_bytecount then |
6052
ce3244c084f9
util.xmppstream: Disable LuaExpat's buffering (if possible)
Matthew Wild <mwild1@gmail.com>
parents:
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diff
changeset
|
163 |
stanza_size = stanza_size + self:getcurrentbytecount(); |
6042
1107d66d2ab2
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parents:
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changeset
|
164 |
end |
2492
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|
165 |
t_insert(chardata, data); |
6042
1107d66d2ab2
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parents:
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changeset
|
166 |
elseif lxp_supports_bytecount then |
6052
ce3244c084f9
util.xmppstream: Disable LuaExpat's buffering (if possible)
Matthew Wild <mwild1@gmail.com>
parents:
6042
diff
changeset
|
167 |
cb_handleprogress(self:getcurrentbytecount()); |
2492
b5e2d1919ec3
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parents:
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diff
changeset
|
168 |
end |
b5e2d1919ec3
xmlhandlers: Fixed indentation and added some semicolons.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
169 |
end |
b5e2d1919ec3
xmlhandlers: Fixed indentation and added some semicolons.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
170 |
function xml_handlers:EndElement(tagname) |
6042
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parents:
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changeset
|
171 |
if lxp_supports_bytecount then |
1107d66d2ab2
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parents:
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diff
changeset
|
172 |
stanza_size = stanza_size + self:getcurrentbytecount() |
1107d66d2ab2
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parents:
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changeset
|
173 |
end |
3633
4069c37c54bc
util.xmppstream: Preserve the stream content namespace on descendents of elements which are in another namespace.
Waqas Hussain <waqas20@gmail.com>
parents:
3540
diff
changeset
|
174 |
if non_streamns_depth > 0 then |
4069c37c54bc
util.xmppstream: Preserve the stream content namespace on descendents of elements which are in another namespace.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
175 |
non_streamns_depth = non_streamns_depth - 1; |
4069c37c54bc
util.xmppstream: Preserve the stream content namespace on descendents of elements which are in another namespace.
Waqas Hussain <waqas20@gmail.com>
parents:
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diff
changeset
|
176 |
end |
2493
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xmlhandlers: Rearranged a little code.
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parents:
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diff
changeset
|
177 |
if stanza then |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
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parents:
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diff
changeset
|
178 |
if #chardata > 0 then |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
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parents:
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diff
changeset
|
179 |
-- We have some character data in the buffer |
3987
8fbf57722368
util.xmppstream: Optimized stanza building by bypassing the stanza API.
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parents:
3927
diff
changeset
|
180 |
t_insert(stanza, t_concat(chardata)); |
2493
ec09d16a51e1
xmlhandlers: Rearranged a little code.
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parents:
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diff
changeset
|
181 |
chardata = {}; |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
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parents:
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diff
changeset
|
182 |
end |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
183 |
-- Complete stanza |
3987
8fbf57722368
util.xmppstream: Optimized stanza building by bypassing the stanza API.
Waqas Hussain <waqas20@gmail.com>
parents:
3927
diff
changeset
|
184 |
if #stack == 0 then |
6042
1107d66d2ab2
util.xmppstream: Implement stanza size limiting, default limit 10MB
Matthew Wild <mwild1@gmail.com>
parents:
5311
diff
changeset
|
185 |
if lxp_supports_bytecount then |
1107d66d2ab2
util.xmppstream: Implement stanza size limiting, default limit 10MB
Matthew Wild <mwild1@gmail.com>
parents:
5311
diff
changeset
|
186 |
cb_handleprogress(stanza_size); |
1107d66d2ab2
util.xmppstream: Implement stanza size limiting, default limit 10MB
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parents:
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diff
changeset
|
187 |
end |
1107d66d2ab2
util.xmppstream: Implement stanza size limiting, default limit 10MB
Matthew Wild <mwild1@gmail.com>
parents:
5311
diff
changeset
|
188 |
stanza_size = 0; |
2493
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
189 |
if tagname ~= stream_error_tag then |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
190 |
cb_handlestanza(session, stanza); |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
191 |
else |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
192 |
cb_error(session, "stream-error", stanza); |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
193 |
end |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
194 |
stanza = nil; |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
195 |
else |
3987
8fbf57722368
util.xmppstream: Optimized stanza building by bypassing the stanza API.
Waqas Hussain <waqas20@gmail.com>
parents:
3927
diff
changeset
|
196 |
stanza = t_remove(stack); |
2493
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
197 |
end |
ec09d16a51e1
xmlhandlers: Rearranged a little code.
Waqas Hussain <waqas20@gmail.com>
parents:
2492
diff
changeset
|
198 |
else |
4483
1dbd06eedaa4
util.xmppstream: Have faith in the XML parser matching start and end tags.
Waqas Hussain <waqas20@gmail.com>
parents:
4482
diff
changeset
|
199 |
if cb_streamclosed then |
1dbd06eedaa4
util.xmppstream: Have faith in the XML parser matching start and end tags.
Waqas Hussain <waqas20@gmail.com>
parents:
4482
diff
changeset
|
200 |
cb_streamclosed(session); |
1
b8787e859fd2
Switched to new connection framework, courtesy of the luadch project
matthew
parents:
diff
changeset
|
201 |
end |
b8787e859fd2
Switched to new connection framework, courtesy of the luadch project
matthew
parents:
diff
changeset
|
202 |
end |
2492
b5e2d1919ec3
xmlhandlers: Fixed indentation and added some semicolons.
Waqas Hussain <waqas20@gmail.com>
parents:
2468
diff
changeset
|
203 |
end |
4277 | 204 |
|
4288 | 205 |
local function restricted_handler(parser) |
4275
5305a665bdd4
util.xmppstream: Reject XML comments, processing instructions and (if supported by LuaExpat) DTDs. If not supported, log a warning.
Matthew Wild <mwild1@gmail.com>
parents:
3927
diff
changeset
|
206 |
cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1."); |
4305
e3ffa91517cc
util.xmppstream: Check to make sure parser.stop is present before calling it.
Waqas Hussain <waqas20@gmail.com>
parents:
4289
diff
changeset
|
207 |
if not parser.stop or not parser:stop() then |
4288 | 208 |
error("Failed to abort parsing"); |
4276
a37522bf6b1b
xmlhandlers: Reject XML comments, processing instructions and (if supported by LuaExpat) DTDs. If not supported, log a warning. [Backport of 7cc426988bcc in trunk]
Matthew Wild <mwild1@gmail.com>
parents:
2923
diff
changeset
|
209 |
end |
4275
5305a665bdd4
util.xmppstream: Reject XML comments, processing instructions and (if supported by LuaExpat) DTDs. If not supported, log a warning.
Matthew Wild <mwild1@gmail.com>
parents:
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diff
changeset
|
210 |
end |
5776
bd0ff8ae98a8
Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents:
5311
diff
changeset
|
211 |
|
4275
5305a665bdd4
util.xmppstream: Reject XML comments, processing instructions and (if supported by LuaExpat) DTDs. If not supported, log a warning.
Matthew Wild <mwild1@gmail.com>
parents:
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if lxp_supports_doctype then |
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xml_handlers.StartDoctypeDecl = restricted_handler; |
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end |
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xml_handlers.Comment = restricted_handler; |
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216 |
xml_handlers.ProcessingInstruction = restricted_handler; |
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|
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local function reset() |
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stanza, chardata, stanza_size = nil, {}, 0; |
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stack = {}; |
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221 |
end |
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222 |
|
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223 |
local function set_session(stream, new_session) -- luacheck: ignore 212/stream |
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session = new_session; |
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225 |
end |
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226 |
|
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return xml_handlers, { reset = reset, set_session = set_session }; |
1
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228 |
end |
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229 |
|
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|
230 |
local function new(session, stream_callbacks, stanza_size_limit) |
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231 |
-- Used to track parser progress (e.g. to enforce size limits) |
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232 |
local n_outstanding_bytes = 0; |
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233 |
local handle_progress; |
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234 |
if lxp_supports_bytecount then |
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235 |
function handle_progress(n_parsed_bytes) |
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236 |
n_outstanding_bytes = n_outstanding_bytes - n_parsed_bytes; |
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237 |
end |
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238 |
stanza_size_limit = stanza_size_limit or default_stanza_size_limit; |
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239 |
elseif stanza_size_limit then |
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|
240 |
error("Stanza size limits are not supported on this version of LuaExpat") |
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241 |
end |
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|
242 |
|
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|
243 |
local handlers, meta = new_sax_handlers(session, stream_callbacks, handle_progress); |
6052
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|
244 |
local parser = new_parser(handlers, ns_separator, false); |
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|
245 |
local parse = parser.parse; |
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|
246 |
|
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|
247 |
function session.open_stream(session, from, to) -- luacheck: ignore 432/session |
6063
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|
248 |
local send = session.sends2s or session.send; |
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|
249 |
|
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|
250 |
local attr = { |
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|
251 |
["xmlns:stream"] = "http://etherx.jabber.org/streams", |
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|
252 |
["xml:lang"] = "en", |
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|
253 |
xmlns = stream_callbacks.default_ns, |
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|
254 |
version = session.version and (session.version > 0 and "1.0" or nil), |
6355
c2d144d3f8dd
util.xmppstream: Don't include empty stream ID in stream header (got here from mod_c2s)
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changeset
|
255 |
id = session.streamid, |
6063
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|
256 |
from = from or session.host, to = to, |
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|
257 |
}; |
6084
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|
258 |
if session.stream_attrs then |
3c02a9ed399e
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|
259 |
session:stream_attrs(from, to, attr) |
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|
260 |
end |
6063
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|
261 |
send("<?xml version='1.0'?>"); |
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|
262 |
send(st.stanza("stream:stream", attr):top_tag()); |
e626ee2fe106
mod_c2s, mod_s2s, mod_component, util.xmppstream: Move all session:open_stream() functions to util.xmppstream
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changeset
|
263 |
return true; |
e626ee2fe106
mod_c2s, mod_s2s, mod_component, util.xmppstream: Move all session:open_stream() functions to util.xmppstream
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parents:
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changeset
|
264 |
end |
e626ee2fe106
mod_c2s, mod_s2s, mod_component, util.xmppstream: Move all session:open_stream() functions to util.xmppstream
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parents:
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changeset
|
265 |
|
3032
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|
266 |
return { |
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|
267 |
reset = function () |
6053
2f93a04564b2
util.xmppstream: Also disable CharacterData merging after stream restarts
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changeset
|
268 |
parser = new_parser(handlers, ns_separator, false); |
3032
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|
269 |
parse = parser.parse; |
6042
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|
270 |
n_outstanding_bytes = 0; |
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|
271 |
meta.reset(); |
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|
272 |
end, |
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|
273 |
feed = function (self, data) -- luacheck: ignore 212/self |
6042
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|
274 |
if lxp_supports_bytecount then |
1107d66d2ab2
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|
275 |
n_outstanding_bytes = n_outstanding_bytes + #data; |
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changeset
|
276 |
end |
1107d66d2ab2
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changeset
|
277 |
local ok, err = parse(parser, data); |
1107d66d2ab2
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|
278 |
if lxp_supports_bytecount and n_outstanding_bytes > stanza_size_limit then |
1107d66d2ab2
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|
279 |
return nil, "stanza-too-large"; |
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|
280 |
end |
1107d66d2ab2
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|
281 |
return ok, err; |
3424
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|
282 |
end, |
9e0df614e5d0
util.xmppstream: Add set_session() method to change the session that a stream is associated with
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|
283 |
set_session = meta.set_session; |
3032
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|
284 |
}; |
2921
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|
285 |
end |
f0ddfd7739ea
util.xmppstream: new() now returns a parser object
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|
286 |
|
6780
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|
287 |
return { |
5de6b93d0190
util.*: Remove use of module() function, make all module functions local and return them in a table at the end
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|
288 |
ns_separator = ns_separator; |
5de6b93d0190
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|
289 |
ns_pattern = ns_pattern; |
5de6b93d0190
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|
290 |
new_sax_handlers = new_sax_handlers; |
5de6b93d0190
util.*: Remove use of module() function, make all module functions local and return them in a table at the end
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|
291 |
new = new; |
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|
292 |
}; |