prosody
bb81c13d2c6f
util/xmppstream.lua

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util/xmppstream.lua @ 5335:bb81c13d2c6f

MUC: Always return <service-unavailable/> when a node is present in service discovery requests.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 26 Feb 2013 23:56:44 +0500
parent 5311:86fe6e2fa5ae
child 5776:bd0ff8ae98a8
child 6042:1107d66d2ab2
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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 local lxp = require "lxp";
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11 local st = require "util.stanza";
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12 local stanza_mt = st.stanza_mt;
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14 local error = error;
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15 local tostring = tostring;
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16 local t_insert = table.insert;
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17 local t_concat = table.concat;
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18 local t_remove = table.remove;
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19 local setmetatable = setmetatable;
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20
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21 -- COMPAT: w/LuaExpat 1.1.0
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22 local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false });
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24 module "xmppstream"
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25
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26 local new_parser = lxp.new;
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27
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28 local xml_namespace = {
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29 ["http://www.w3.org/XML/1998/namespace\1lang"] = "xml:lang";
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30 ["http://www.w3.org/XML/1998/namespace\1space"] = "xml:space";
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31 ["http://www.w3.org/XML/1998/namespace\1base"] = "xml:base";
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32 ["http://www.w3.org/XML/1998/namespace\1id"] = "xml:id";
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33 };
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35 local xmlns_streams = "http://etherx.jabber.org/streams";
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36
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37 local ns_separator = "\1";
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38 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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40 _M.ns_separator = ns_separator;
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41 _M.ns_pattern = ns_pattern;
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42
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43 function new_sax_handlers(session, stream_callbacks)
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44 local xml_handlers = {};
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45
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46 local cb_streamopened = stream_callbacks.streamopened;
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47 local cb_streamclosed = stream_callbacks.streamclosed;
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48 local cb_error = stream_callbacks.error or function(session, e, stanza) error("XML stream error: "..tostring(e)..(stanza and ": "..tostring(stanza) or ""),2); end;
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49 local cb_handlestanza = stream_callbacks.handlestanza;
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50
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51 local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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52 local stream_tag = stream_callbacks.stream_tag or "stream";
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53 if stream_ns ~= "" then
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54 stream_tag = stream_ns..ns_separator..stream_tag;
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55 end
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56 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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57
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58 local stream_default_ns = stream_callbacks.default_ns;
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59
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60 local stack = {};
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61 local chardata, stanza = {};
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62 local non_streamns_depth = 0;
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63 function xml_handlers:StartElement(tagname, attr)
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64 if stanza and #chardata > 0 then
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65 -- We have some character data in the buffer
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66 t_insert(stanza, t_concat(chardata));
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67 chardata = {};
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68 end
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69 local curr_ns,name = tagname:match(ns_pattern);
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70 if name == "" then
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71 curr_ns, name = "", curr_ns;
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72 end
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73
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74 if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then
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75 attr.xmlns = curr_ns;
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76 non_streamns_depth = non_streamns_depth + 1;
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77 end
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78
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79 for i=1,#attr do
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80 local k = attr[i];
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81 attr[i] = nil;
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82 local xmlk = xml_namespace[k];
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83 if xmlk then
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84 attr[xmlk] = 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
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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 non_streamns_depth = 0;
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93 if cb_streamopened then
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94 cb_streamopened(session, attr);
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95 end
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96 else
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97 -- Garbage before stream?
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98 cb_error(session, "no-stream");
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99 end
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100 return;
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101 end
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102 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
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103 cb_error(session, "invalid-top-level-element");
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104 end
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105
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106 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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107 else -- we are inside a stanza, so add a tag
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108 t_insert(stack, stanza);
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109 local oldstanza = stanza;
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110 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt);
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111 t_insert(oldstanza, stanza);
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112 t_insert(oldstanza.tags, stanza);
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113 end
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114 end
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115 function xml_handlers:CharacterData(data)
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116 if stanza then
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117 t_insert(chardata, data);
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118 end
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119 end
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120 function xml_handlers:EndElement(tagname)
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121 if non_streamns_depth > 0 then
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122 non_streamns_depth = non_streamns_depth - 1;
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123 end
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124 if stanza then
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125 if #chardata > 0 then
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126 -- We have some character data in the buffer
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127 t_insert(stanza, t_concat(chardata));
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128 chardata = {};
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129 end
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130 -- Complete stanza
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131 if #stack == 0 then
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132 if tagname ~= stream_error_tag then
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133 cb_handlestanza(session, stanza);
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134 else
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135 cb_error(session, "stream-error", stanza);
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136 end
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137 stanza = nil;
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138 else
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139 stanza = t_remove(stack);
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140 end
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141 else
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142 if cb_streamclosed then
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143 cb_streamclosed(session);
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144 end
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145 end
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146 end
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147
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148 local function restricted_handler(parser)
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149 cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1.");
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150 if not parser.stop or not parser:stop() then
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151 error("Failed to abort parsing");
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152 end
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153 end
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154
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155 if lxp_supports_doctype then
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156 xml_handlers.StartDoctypeDecl = restricted_handler;
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157 end
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158 xml_handlers.Comment = restricted_handler;
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159 xml_handlers.ProcessingInstruction = restricted_handler;
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160
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161 local function reset()
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162 stanza, chardata = nil, {};
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163 stack = {};
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164 end
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165
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166 local function set_session(stream, new_session)
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167 session = new_session;
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168 end
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169
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170 return xml_handlers, { reset = reset, set_session = set_session };
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171 end
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172
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173 function new(session, stream_callbacks)
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174 local handlers, meta = new_sax_handlers(session, stream_callbacks);
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175 local parser = new_parser(handlers, ns_separator);
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176 local parse = parser.parse;
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177
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178 return {
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179 reset = function ()
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180 parser = new_parser(handlers, ns_separator);
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181 parse = parser.parse;
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182 meta.reset();
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183 end,
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184 feed = function (self, data)
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185 return parse(parser, data);
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186 end,
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187 set_session = meta.set_session;
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188 };
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189 end
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190
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191 return _M;