prosody
1dbd06eedaa4
util/xmppstream.lua

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util/xmppstream.lua @ 4483:1dbd06eedaa4

util.xmppstream: Have faith in the XML parser matching start and end tags.
author Waqas Hussain <waqas20@gmail.com>
date Wed, 25 Jan 2012 11:49:27 +0500
parent 4482:722cf2680028
child 4484:0da4e0f0f0ef
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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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26 local new_parser = lxp.new;
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27
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28 local ns_prefixes = {
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29 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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30 };
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32 local xmlns_streams = "http://etherx.jabber.org/streams";
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33
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34 local ns_separator = "\1";
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35 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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36
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37 _M.ns_separator = ns_separator;
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38 _M.ns_pattern = ns_pattern;
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39
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40 function new_sax_handlers(session, stream_callbacks)
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41 local xml_handlers = {};
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42
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43 local cb_streamopened = stream_callbacks.streamopened;
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44 local cb_streamclosed = stream_callbacks.streamclosed;
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45 local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end;
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46 local cb_handlestanza = stream_callbacks.handlestanza;
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47
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48 local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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49 local stream_tag = stream_callbacks.stream_tag or "stream";
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50 if stream_ns ~= "" then
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51 stream_tag = stream_ns..ns_separator..stream_tag;
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52 end
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53 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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54
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55 local stream_default_ns = stream_callbacks.default_ns;
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56
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57 local stack = {};
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58 local chardata, stanza = {};
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59 local non_streamns_depth = 0;
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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 t_insert(stanza, 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 or non_streamns_depth > 0 then
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72 attr.xmlns = curr_ns;
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73 non_streamns_depth = non_streamns_depth + 1;
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74 end
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75
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76 -- FIXME !!!!!
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77 for i=1,#attr do
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78 local k = attr[i];
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79 attr[i] = nil;
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80 local ns, nm = k:match(ns_pattern);
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81 if nm ~= "" then
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82 ns = ns_prefixes[ns];
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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;
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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
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148
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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
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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, {};
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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
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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();
38459cffaf67 util.xmppstream: Stream objects now just have feed/reset methods
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184 end,
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diff changeset
185 feed = function (self, data)
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186 return parse(parser, data);
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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
f0ddfd7739ea util.xmppstream: new() now returns a parser object
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diff changeset
191
2920
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diff changeset
192 return _M;