core/xmlhandlers.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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 pairs = pairs;
  16 local ipairs = ipairs;
  17 local t_insert = table.insert;
  18 local t_concat = table.concat;
  19
  20 local default_log = require "util.logger".init("xmlhandlers");
  21
  22 local error = error;
  23
  24 module "xmlhandlers"
  25
  26 local ns_prefixes = {
  27                                                 ["http://www.w3.org/XML/1998/namespace"] = "xml";
  28                                 }
  29
  30 function init_xmlhandlers(session, stream_callbacks)
  31                 local ns_stack = { "" };
  32                 local curr_ns, name = "";
  33                 local curr_tag;
  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_tag = stream_callbacks.stream_tag;
  44                 local stream_default_ns = stream_callbacks.default_ns;
  45
  46                 local stanza
  47                 function xml_handlers:StartElement(tagname, attr)
  48                         if stanza and #chardata > 0 then
  49                                 -- We have some character data in the buffer
  50                                 stanza:text(t_concat(chardata));
  51                                 chardata = {};
  52                         end
  53                         local curr_ns,name = tagname:match("^(.-)|?([^%|]-)$");
  54                         if not name then
  55                                 curr_ns, name = "", curr_ns;
  56                         end
  57
  58                         if curr_ns ~= stream_default_ns then
  59                                 attr.xmlns = curr_ns;
  60                         end
  61
  62                         -- FIXME !!!!!
  63                         for i=1,#attr do
  64                                 local k = attr[i];
  65                                 attr[i] = nil;
  66                                 local ns, nm = k:match("^([^|]+)|?([^|]-)$")
  67                                 if ns and nm then
  68                                         ns = ns_prefixes[ns];
  69                                         if ns then
  70                                                 attr[ns..":"..nm] = attr[k];
  71                                                 attr[k] = nil;
  72                                         end
  73                                 end
  74                         end
  75
  76                         if not stanza then --if we are not currently inside a stanza
  77                                 if session.notopen then
  78                                         if tagname == stream_tag then
  79                                                 if cb_streamopened then
  80                                                         cb_streamopened(session, attr);
  81                                                 end
  82                                         else
  83                                                 -- Garbage before stream?
  84                                                 cb_error(session, "no-stream");
  85                                         end
  86                                         return;
  87                                 end
  88                                 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
  89                                         cb_error(session, "invalid-top-level-element");
  90                                 end
  91
  92                                 stanza = st.stanza(name, attr);
  93                                 curr_tag = stanza;
  94                         else -- we are inside a stanza, so add a tag
  95                                 attr.xmlns = nil;
  96                                 if curr_ns ~= stream_default_ns then
  97                                         attr.xmlns = curr_ns;
  98                                 end
  99                                 stanza:tag(name, attr);
 100                         end
 101                 end
 102                 function xml_handlers:CharacterData(data)
 103                         if stanza then
 104                                 t_insert(chardata, data);
 105                         end
 106                 end
 107                 function xml_handlers:EndElement(tagname)
 108                         curr_ns,name = tagname:match("^(.-)|?([^%|]-)$");
 109                         if not name then
 110                                 curr_ns, name = "", curr_ns;
 111                         end
 112                         if (not stanza) or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then
 113                                 if tagname == stream_tag then
 114                                         if cb_streamclosed then
 115                                                 cb_streamclosed(session);
 116                                         end
 117                                         return;
 118                                 elseif name == "error" then
 119                                         cb_error(session, "stream-error", stanza);
 120                                 else
 121                                         cb_error(session, "parse-error", "unexpected-element-close", name);
 122                                 end
 123                         end
 124                         if #chardata > 0 then
 125                                 -- We have some character data in the buffer
 126                                 stanza:text(t_concat(chardata));
 127                                 chardata = {};
 128                         end
 129                         -- Complete stanza
 130                         if #stanza.last_add == 0 then
 131                                 cb_handlestanza(session, stanza);
 132                                 stanza = nil;
 133                         else
 134                                 stanza:up();
 135                         end
 136                 end
 137         return xml_handlers;
 138 end
 139
 140 return init_xmlhandlers;