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util/xmppstream.lua @ 4364:af40cf682eba
util.pubsub: Use built-in actor for auto-creating nodes on publish and subscribe (so they never fail due to permissions)
author | Matthew Wild <mwild1@gmail.com> |
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date | Mon, 29 Aug 2011 15:42:15 -0400 |
parent | 4306:a101c59772e7 |
child | 4425:6f5ed0f4a3e6 |
rev | line source |
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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 -- |
758 | 5 -- This project is MIT/X11 licensed. Please see the |
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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13 |
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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 local t_remove = table.remove; |
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18 local setmetatable = setmetatable; |
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19 |
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20 local default_log = require "util.logger".init("xmppstream"); |
145 | 21 |
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22 -- COMPAT: w/LuaExpat 1.1.0 |
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23 local lxp_supports_doctype = pcall(lxp.new, { StartDoctypeDecl = false }); |
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24 |
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25 if not lxp_supports_doctype then |
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26 default_log("warn", "The version of LuaExpat on your system leaves Prosody " |
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27 .."vulnerable to denial-of-service attacks. You should upgrade to " |
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28 .."LuaExpat 1.1.1 or higher as soon as possible. See " |
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29 .."http://prosody.im/doc/depends#luaexpat for more information."); |
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30 end |
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31 |
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32 local error = error; |
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33 |
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34 module "xmppstream" |
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35 |
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36 local new_parser = lxp.new; |
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37 |
148 | 38 local ns_prefixes = { |
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39 ["http://www.w3.org/XML/1998/namespace"] = "xml"; |
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40 }; |
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41 |
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42 local xmlns_streams = "http://etherx.jabber.org/streams"; |
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43 |
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44 local ns_separator = "\1"; |
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45 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$"; |
148 | 46 |
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47 _M.ns_separator = ns_separator; |
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48 _M.ns_pattern = ns_pattern; |
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49 |
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50 function new_sax_handlers(session, stream_callbacks) |
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51 local xml_handlers = {}; |
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52 |
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53 local log = session.log or default_log; |
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54 |
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55 local cb_streamopened = stream_callbacks.streamopened; |
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56 local cb_streamclosed = stream_callbacks.streamclosed; |
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57 local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end; |
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58 local cb_handlestanza = stream_callbacks.handlestanza; |
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59 |
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60 local stream_ns = stream_callbacks.stream_ns or xmlns_streams; |
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61 local stream_tag = stream_callbacks.stream_tag or "stream"; |
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62 if stream_ns ~= "" then |
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63 stream_tag = stream_ns..ns_separator..stream_tag; |
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64 end |
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65 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error"); |
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66 |
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67 local stream_default_ns = stream_callbacks.default_ns; |
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68 |
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69 local stack = {}; |
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70 local chardata, stanza = {}; |
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71 local non_streamns_depth = 0; |
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72 function xml_handlers:StartElement(tagname, attr) |
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73 if stanza and #chardata > 0 then |
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74 -- We have some character data in the buffer |
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75 t_insert(stanza, t_concat(chardata)); |
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76 chardata = {}; |
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77 end |
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78 local curr_ns,name = tagname:match(ns_pattern); |
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79 if name == "" then |
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80 curr_ns, name = "", curr_ns; |
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81 end |
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82 |
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83 if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then |
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84 attr.xmlns = curr_ns; |
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85 non_streamns_depth = non_streamns_depth + 1; |
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86 end |
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87 |
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88 -- FIXME !!!!! |
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89 for i=1,#attr do |
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90 local k = attr[i]; |
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91 attr[i] = nil; |
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92 local ns, nm = k:match(ns_pattern); |
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93 if nm ~= "" then |
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94 ns = ns_prefixes[ns]; |
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95 if ns then |
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96 attr[ns..":"..nm] = attr[k]; |
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97 attr[k] = nil; |
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98 end |
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99 end |
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100 end |
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101 |
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102 if not stanza then --if we are not currently inside a stanza |
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103 if session.notopen then |
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104 if tagname == stream_tag then |
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105 non_streamns_depth = 0; |
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106 if cb_streamopened then |
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107 cb_streamopened(session, attr); |
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108 end |
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109 else |
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110 -- Garbage before stream? |
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111 cb_error(session, "no-stream"); |
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112 end |
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113 return; |
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114 end |
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115 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then |
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116 cb_error(session, "invalid-top-level-element"); |
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117 end |
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118 |
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119 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt); |
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120 else -- we are inside a stanza, so add a tag |
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121 t_insert(stack, stanza); |
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122 local oldstanza = stanza; |
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123 stanza = setmetatable({ name = name, attr = attr, tags = {} }, stanza_mt); |
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124 t_insert(oldstanza, stanza); |
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125 t_insert(oldstanza.tags, stanza); |
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126 end |
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127 end |
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128 function xml_handlers:CharacterData(data) |
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129 if stanza then |
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130 t_insert(chardata, data); |
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131 end |
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132 end |
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133 function xml_handlers:EndElement(tagname) |
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134 if non_streamns_depth > 0 then |
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135 non_streamns_depth = non_streamns_depth - 1; |
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136 end |
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137 if stanza then |
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138 if #chardata > 0 then |
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139 -- We have some character data in the buffer |
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140 t_insert(stanza, t_concat(chardata)); |
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141 chardata = {}; |
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142 end |
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143 -- Complete stanza |
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144 if #stack == 0 then |
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145 if tagname ~= stream_error_tag then |
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146 cb_handlestanza(session, stanza); |
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147 else |
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148 cb_error(session, "stream-error", stanza); |
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149 end |
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150 stanza = nil; |
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151 else |
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152 stanza = t_remove(stack); |
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153 end |
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154 else |
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155 if tagname == stream_tag then |
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156 if cb_streamclosed then |
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157 cb_streamclosed(session); |
148 | 158 end |
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159 else |
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160 local curr_ns,name = tagname:match(ns_pattern); |
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161 if name == "" then |
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162 curr_ns, name = "", curr_ns; |
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163 end |
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164 cb_error(session, "parse-error", "unexpected-element-close", name); |
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165 end |
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166 stanza, chardata = nil, {}; |
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167 stack = {}; |
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168 end |
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169 end |
4277 | 170 |
4288 | 171 local function restricted_handler(parser) |
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172 cb_error(session, "parse-error", "restricted-xml", "Restricted XML, see RFC 6120 section 11.1."); |
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173 if not parser.stop or not parser:stop() then |
4288 | 174 error("Failed to abort parsing"); |
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175 end |
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176 end |
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177 |
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178 if lxp_supports_doctype then |
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179 xml_handlers.StartDoctypeDecl = restricted_handler; |
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180 end |
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181 xml_handlers.Comment = restricted_handler; |
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182 xml_handlers.ProcessingInstruction = restricted_handler; |
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183 |
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184 local function reset() |
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185 stanza, chardata = nil, {}; |
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186 stack = {}; |
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187 end |
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188 |
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189 local function set_session(stream, new_session) |
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190 session = new_session; |
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191 log = new_session.log or default_log; |
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192 end |
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193 |
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194 return xml_handlers, { reset = reset, set_session = set_session }; |
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195 end |
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196 |
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197 function new(session, stream_callbacks) |
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198 local handlers, meta = new_sax_handlers(session, stream_callbacks); |
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199 local parser = new_parser(handlers, ns_separator); |
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200 local parse = parser.parse; |
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201 |
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202 return { |
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203 reset = function () |
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204 parser = new_parser(handlers, ns_separator); |
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205 parse = parser.parse; |
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206 meta.reset(); |
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207 end, |
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208 feed = function (self, data) |
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209 return parse(parser, data); |
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210 end, |
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211 set_session = meta.set_session; |
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212 }; |
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213 end |
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214 |
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215 return _M; |