core/xmlhandlers.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10
  11 require "util.stanza"
  12
  13 local st = stanza;
  14 local tostring = tostring;
  15 local t_insert = table.insert;
  16 local t_concat = table.concat;
  17
  18 local default_log = require "util.logger".init("xmlhandlers");
  19
  20 local error = error;
  21
  22 module "xmlhandlers"
  23
  24 local ns_prefixes = {
  25         ["http://www.w3.org/XML/1998/namespace"] = "xml";
  26 };
  27
  28 local xmlns_streams = "http://etherx.jabber.org/streams";
  29
  30 local ns_separator = "\1";
  31 local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
  32
  33 function init_xmlhandlers(session, stream_callbacks)
  34         local chardata = {};
  35         local xml_handlers = {};
  36         local log = session.log or default_log;
  37
  38         local cb_streamopened = stream_callbacks.streamopened;
  39         local cb_streamclosed = stream_callbacks.streamclosed;
  40         local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end;
  41         local cb_handlestanza = stream_callbacks.handlestanza;
  42
  43         local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
  44         local stream_tag = stream_ns..ns_separator..(stream_callbacks.stream_tag or "stream");
  45         local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
  46
  47         local stream_default_ns = stream_callbacks.default_ns;
  48
  49         local stanza;
  50         function xml_handlers:StartElement(tagname, attr)
  51                 if stanza and #chardata > 0 then
  52                         -- We have some character data in the buffer
  53                         stanza:text(t_concat(chardata));
  54                         chardata = {};
  55                 end
  56                 local curr_ns,name = tagname:match(ns_pattern);
  57                 if name == "" then
  58                         curr_ns, name = "", curr_ns;
  59                 end
  60
  61                 if curr_ns ~= stream_default_ns then
  62                         attr.xmlns = curr_ns;
  63                 end
  64
  65                 -- FIXME !!!!!
  66                 for i=1,#attr do
  67                         local k = attr[i];
  68                         attr[i] = nil;
  69                         local ns, nm = k:match(ns_pattern);
  70                         if nm ~= "" then
  71                                 ns = ns_prefixes[ns];
  72                                 if ns then
  73                                         attr[ns..":"..nm] = attr[k];
  74                                         attr[k] = nil;
  75                                 end
  76                         end
  77                 end
  78
  79                 if not stanza then --if we are not currently inside a stanza
  80                         if session.notopen then
  81                                 if tagname == stream_tag then
  82                                         if cb_streamopened then
  83                                                 cb_streamopened(session, attr);
  84                                         end
  85                                 else
  86                                         -- Garbage before stream?
  87                                         cb_error(session, "no-stream");
  88                                 end
  89                                 return;
  90                         end
  91                         if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
  92                                 cb_error(session, "invalid-top-level-element");
  93                         end
  94
  95                         stanza = st.stanza(name, attr);
  96                 else -- we are inside a stanza, so add a tag
  97                         attr.xmlns = nil;
  98                         if curr_ns ~= stream_default_ns then
  99                                 attr.xmlns = curr_ns;
 100                         end
 101                         stanza:tag(name, attr);
 102                 end
 103         end
 104         function xml_handlers:CharacterData(data)
 105                 if stanza then
 106                         t_insert(chardata, data);
 107                 end
 108         end
 109         function xml_handlers:EndElement(tagname)
 110                 if stanza then
 111                         if #chardata > 0 then
 112                                 -- We have some character data in the buffer
 113                                 stanza:text(t_concat(chardata));
 114                                 chardata = {};
 115                         end
 116                         -- Complete stanza
 117                         if #stanza.last_add == 0 then
 118                                 if tagname ~= stream_error_tag then
 119                                         cb_handlestanza(session, stanza);
 120                                 else
 121                                         cb_error(session, "stream-error", stanza);
 122                                 end
 123                                 stanza = nil;
 124                         else
 125                                 stanza:up();
 126                         end
 127                 else
 128                         if tagname == stream_tag then
 129                                 if cb_streamclosed then
 130                                         cb_streamclosed(session);
 131                                 end
 132                         else
 133                                 local curr_ns,name = tagname:match(ns_pattern);
 134                                 if name == "" then
 135                                         curr_ns, name = "", curr_ns;
 136                                 end
 137                                 cb_error(session, "parse-error", "unexpected-element-close", name);
 138                         end
 139                         stanza, chardata = nil, {};
 140                 end
 141         end
 142         return xml_handlers;
 143 end
 144
 145 return init_xmlhandlers;