prosody
2c4535e13f23
util/xmppstream.lua

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util/xmppstream.lua @ 3836:2c4535e13f23

certs/Makefile: Remove -c flag to chmod, which appears to be a GNUism (thanks Kev)
author Matthew Wild <mwild1@gmail.com>
date Wed, 08 Dec 2010 17:01:23 +0000
parent 3830:6e13a7a0b535
child 3927:1b57e83266f0
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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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13 local tostring = tostring;
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14 local t_insert = table.insert;
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15 local t_concat = table.concat;
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16
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17 local default_log = require "util.logger".init("xmppstream");
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18
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19 local error = error;
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20
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21 module "xmppstream"
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22
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23 local new_parser = lxp.new;
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24
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25 local ns_prefixes = {
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26 ["http://www.w3.org/XML/1998/namespace"] = "xml";
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27 };
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29 local xmlns_streams = "http://etherx.jabber.org/streams";
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30
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31 local ns_separator = "\1";
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32 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
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33
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34 _M.ns_separator = ns_separator;
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35 _M.ns_pattern = ns_pattern;
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36
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37 function new_sax_handlers(session, stream_callbacks)
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38 local xml_handlers = {};
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39
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40 local log = session.log or default_log;
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41
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42 local cb_streamopened = stream_callbacks.streamopened;
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43 local cb_streamclosed = stream_callbacks.streamclosed;
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44 local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end;
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45 local cb_handlestanza = stream_callbacks.handlestanza;
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46
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47 local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
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48 local stream_tag = stream_ns..ns_separator..(stream_callbacks.stream_tag or "stream");
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49 local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
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50
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51 local stream_default_ns = stream_callbacks.default_ns;
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52
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53 local chardata, stanza = {};
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54 local non_streamns_depth = 0;
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55 function xml_handlers:StartElement(tagname, attr)
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56 if stanza and #chardata > 0 then
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57 -- We have some character data in the buffer
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58 stanza:text(t_concat(chardata));
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59 chardata = {};
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60 end
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61 local curr_ns,name = tagname:match(ns_pattern);
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62 if name == "" then
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63 curr_ns, name = "", curr_ns;
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64 end
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65
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66 if curr_ns ~= stream_default_ns or non_streamns_depth > 0 then
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67 attr.xmlns = curr_ns;
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68 non_streamns_depth = non_streamns_depth + 1;
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69 end
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70
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71 -- FIXME !!!!!
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72 for i=1,#attr do
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73 local k = attr[i];
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74 attr[i] = nil;
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75 local ns, nm = k:match(ns_pattern);
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76 if nm ~= "" then
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77 ns = ns_prefixes[ns];
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78 if ns then
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79 attr[ns..":"..nm] = attr[k];
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80 attr[k] = nil;
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81 end
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82 end
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83 end
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84
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85 if not stanza then --if we are not currently inside a stanza
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86 if session.notopen then
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87 if tagname == stream_tag then
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88 non_streamns_depth = 0;
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89 if cb_streamopened then
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90 cb_streamopened(session, attr);
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91 end
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92 else
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93 -- Garbage before stream?
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94 cb_error(session, "no-stream");
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95 end
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96 return;
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97 end
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98 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
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99 cb_error(session, "invalid-top-level-element");
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100 end
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101
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102 stanza = st.stanza(name, attr);
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103 else -- we are inside a stanza, so add a tag
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104 stanza:tag(name, attr);
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105 end
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106 end
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107 function xml_handlers:CharacterData(data)
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108 if stanza then
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109 t_insert(chardata, data);
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110 end
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111 end
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112 function xml_handlers:EndElement(tagname)
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113 if non_streamns_depth > 0 then
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114 non_streamns_depth = non_streamns_depth - 1;
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115 end
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116 if stanza then
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117 if #chardata > 0 then
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118 -- We have some character data in the buffer
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119 stanza:text(t_concat(chardata));
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120 chardata = {};
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121 end
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122 -- Complete stanza
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123 local last_add = stanza.last_add;
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124 if not last_add or #last_add == 0 then
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125 if tagname ~= stream_error_tag then
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126 cb_handlestanza(session, stanza);
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127 else
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128 cb_error(session, "stream-error", stanza);
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129 end
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130 stanza = nil;
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131 else
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132 stanza:up();
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133 end
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134 else
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135 if tagname == stream_tag then
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136 if cb_streamclosed then
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137 cb_streamclosed(session);
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138 end
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139 else
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140 local curr_ns,name = tagname:match(ns_pattern);
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141 if name == "" then
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142 curr_ns, name = "", curr_ns;
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143 end
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144 cb_error(session, "parse-error", "unexpected-element-close", name);
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145 end
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146 stanza, chardata = nil, {};
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147 end
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148 end
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149
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150 local function reset()
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151 stanza, chardata = nil, {};
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152 end
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153
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154 local function set_session(stream, new_session)
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155 session = new_session;
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156 log = new_session.log or default_log;
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157 end
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158
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159 return xml_handlers, { reset = reset, set_session = set_session };
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160 end
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161
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162 function new(session, stream_callbacks)
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163 local handlers, meta = new_sax_handlers(session, stream_callbacks);
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164 local parser = new_parser(handlers, ns_separator);
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165 local parse = parser.parse;
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166
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167 return {
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168 reset = function ()
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169 parser = new_parser(handlers, ns_separator);
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170 parse = parser.parse;
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171 meta.reset();
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172 end,
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173 feed = function (self, data)
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174 return parse(parser, data);
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175 end,
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176 set_session = meta.set_session;
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177 };
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178 end
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179
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180 return _M;