prosody
683523db4fe8
core/xmlhandlers.lua

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core/xmlhandlers.lua @ 4277:683523db4fe8

Merge 0.6->0.7
author Matthew Wild <mwild1@gmail.com>
date Wed, 01 Jun 2011 23:25:24 +0100
parent 2925:692b3c6c5bd2
parent 4276:a37522bf6b1b
child 4281:5a0144a032d8
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10
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11 require "util.stanza"
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12
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13 local st = stanza;
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14 local tostring = tostring;
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15 local t_insert = table.insert;
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16 local t_concat = table.concat;
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17
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18 local default_log = require "util.logger".init("xmlhandlers");
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19
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20 -- COMPAT: w/LuaExpat 1.1.0
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21 local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false });
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23 if not lxp_supports_doctype then
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24 default_log("warn", "The version of LuaExpat on your system leaves Prosody "
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25 .."vulnerable to denial-of-service attacks. You should upgrade to "
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26 .."LuaExpat 1.1.1 or higher as soon as possible. See "
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27 .."http://prosody.im/doc/depends#luaexpat for more information.");
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28 end
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29
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30 local error = error;
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31
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32 module "xmlhandlers"
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33
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34 local ns_prefixes = {
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35 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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36 };
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38 local xmlns_streams = "http://etherx.jabber.org/streams";
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39
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40 local ns_separator = "\1";
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41 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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42
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43 function init_xmlhandlers(session, stream_callbacks)
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44 local chardata = {};
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45 local xml_handlers = {};
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46 local log = session.log or default_log;
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47
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48 local cb_streamopened = stream_callbacks.streamopened;
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49 local cb_streamclosed = stream_callbacks.streamclosed;
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50 local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end;
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51 local cb_handlestanza = stream_callbacks.handlestanza;
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52
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53 local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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54 local stream_tag = stream_ns..ns_separator..(stream_callbacks.stream_tag or "stream");
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55 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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56
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57 local stream_default_ns = stream_callbacks.default_ns;
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58
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59 local stanza;
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60 function xml_handlers:StartElement(tagname, attr)
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61 if stanza and #chardata > 0 then
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62 -- We have some character data in the buffer
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63 stanza:text(t_concat(chardata));
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64 chardata = {};
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65 end
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66 local curr_ns,name = tagname:match(ns_pattern);
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67 if name == "" then
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68 curr_ns, name = "", curr_ns;
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69 end
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70
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71 if curr_ns ~= stream_default_ns then
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72 attr.xmlns = curr_ns;
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73 end
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74
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75 -- FIXME !!!!!
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76 for i=1,#attr do
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77 local k = attr[i];
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78 attr[i] = nil;
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79 local ns, nm = k:match(ns_pattern);
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80 if nm ~= "" then
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81 ns = ns_prefixes[ns];
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82 if ns then
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83 attr[ns..":"..nm] = attr[k];
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84 attr[k] = nil;
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85 end
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86 end
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87 end
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88
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89 if not stanza then --if we are not currently inside a stanza
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90 if session.notopen then
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91 if tagname == stream_tag then
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92 if cb_streamopened then
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93 cb_streamopened(session, attr);
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94 end
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95 else
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96 -- Garbage before stream?
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97 cb_error(session, "no-stream");
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98 end
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99 return;
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100 end
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101 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
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102 cb_error(session, "invalid-top-level-element");
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103 end
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104
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105 stanza = st.stanza(name, attr);
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106 else -- we are inside a stanza, so add a tag
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107 attr.xmlns = nil;
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108 if curr_ns ~= stream_default_ns then
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109 attr.xmlns = curr_ns;
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110 end
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111 stanza:tag(name, attr);
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112 end
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113 end
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114 function xml_handlers:CharacterData(data)
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115 if stanza then
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116 t_insert(chardata, data);
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117 end
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118 end
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119 function xml_handlers:EndElement(tagname)
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120 if stanza then
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121 if #chardata > 0 then
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122 -- We have some character data in the buffer
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123 stanza:text(t_concat(chardata));
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124 chardata = {};
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125 end
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126 -- Complete stanza
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127 if #stanza.last_add == 0 then
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128 if tagname ~= stream_error_tag then
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129 cb_handlestanza(session, stanza);
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130 else
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131 cb_error(session, "stream-error", stanza);
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132 end
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133 stanza = nil;
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134 else
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135 stanza:up();
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136 end
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137 else
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138 if tagname == stream_tag then
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139 if cb_streamclosed then
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140 cb_streamclosed(session);
148
4c0dcd245d34 s2s works! \o/ \o/
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141 end
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142 else
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143 local curr_ns,name = tagname:match(ns_pattern);
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144 if name == "" then
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145 curr_ns, name = "", curr_ns;
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146 end
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147 cb_error(session, "parse-error", "unexpected-element-close", name);
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148 end
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149 stanza, chardata = nil, {};
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150 end
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151 end
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152
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153 local function restricted_handler()
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154 cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1.");
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155 end
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156
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157 if lxp_supports_doctype then
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158 xml_handlers.StartDoctypeDecl = restricted_handler;
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159 end
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160 xml_handlers.Comment = restricted_handler;
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161 xml_handlers.StartCdataSection = restricted_handler;
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162 xml_handlers.ProcessingInstruction = restricted_handler;
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163
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164 return xml_handlers;
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165 end
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166
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167 return init_xmlhandlers;