core/xmlhandlers.lua

   1 -- Prosody IM v0.4
   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 type = type;
  18 local t_insert = table.insert;
  19 local t_concat = table.concat;
  20
  21 local default_log = require "util.logger".init("xmlhandlers");
  22
  23 local error = error;
  24
  25 module "xmlhandlers"
  26
  27 local ns_prefixes = {
  28                                                 ["http://www.w3.org/XML/1998/namespace"] = "xml";
  29                                 }
  30
  31 function init_xmlhandlers(session, stream_callbacks)
  32                 local ns_stack = { "" };
  33                 local curr_ns, name = "";
  34                 local curr_tag;
  35                 local chardata = {};
  36                 local xml_handlers = {};
  37                 local log = session.log or default_log;
  38
  39                 local cb_streamopened = stream_callbacks.streamopened;
  40                 local cb_streamclosed = stream_callbacks.streamclosed;
  41                 local cb_error = stream_callbacks.error or function (session, e) error("XML stream error: "..tostring(e)); end;
  42                 local cb_handlestanza = stream_callbacks.handlestanza;
  43
  44                 local stream_tag = stream_callbacks.stream_tag;
  45                 local stream_default_ns = stream_callbacks.default_ns;
  46
  47                 local stanza
  48                 function xml_handlers:StartElement(tagname, attr)
  49                         if stanza and #chardata > 0 then
  50                                 -- We have some character data in the buffer
  51                                 stanza:text(t_concat(chardata));
  52                                 chardata = {};
  53                         end
  54                         local curr_ns,name = tagname:match("^(.-)|?([^%|]-)$");
  55                         if not name then
  56                                 curr_ns, name = "", curr_ns;
  57                         end
  58
  59                         if curr_ns ~= stream_default_ns then
  60                                 attr.xmlns = curr_ns;
  61                         end
  62
  63                         -- FIXME !!!!!
  64                         for i, k in ipairs(attr) do
  65                                 if type(k) == "string" then
  66                                         local ns, nm = k:match("^([^|]+)|?([^|]-)$")
  67                                         if ns and nm then
  68                                                 ns = ns_prefixes[ns];
  69                                                 if ns then
  70                                                         attr[ns..":"..nm] = attr[k];
  71                                                         attr[i] = ns..":"..nm;
  72                                                         attr[k] = nil;
  73                                                 end
  74                                         end
  75                                 end
  76                         end
  77
  78                         if not stanza then --if we are not currently inside a stanza
  79                                 if session.notopen then
  80                                         if tagname == stream_tag then
  81                                                 if cb_streamopened then
  82                                                         cb_streamopened(session, attr);
  83                                                 end
  84                                         else
  85                                                 -- Garbage before stream?
  86                                                 cb_error(session, "no-stream");
  87                                         end
  88                                         return;
  89                                 end
  90                                 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
  91                                         cb_error(session, "invalid-top-level-element");
  92                                 end
  93
  94                                 stanza = st.stanza(name, attr);
  95                                 curr_tag = stanza;
  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                         curr_ns,name = tagname:match("^(.-)|?([^%|]-)$");
 111                         if not name then
 112                                 curr_ns, name = "", curr_ns;
 113                         end
 114                         if (not stanza) or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then
 115                                 if tagname == stream_tag then
 116                                         if cb_streamclosed then
 117                                                 cb_streamclosed(session);
 118                                         end
 119                                         return;
 120                                 elseif name == "error" then
 121                                         cb_error(session, "stream-error", stanza);
 122                                 else
 123                                         cb_error(session, "parse-error", "unexpected-element-close", name);
 124                                 end
 125                         end
 126                         if stanza then
 127                                 if #chardata > 0 then
 128                                         -- We have some character data in the buffer
 129                                         stanza:text(t_concat(chardata));
 130                                         chardata = {};
 131                                 end
 132                                 -- Complete stanza
 133                                 if #stanza.last_add == 0 then
 134                                         cb_handlestanza(session, stanza);
 135                                         stanza = nil;
 136                                 else
 137                                         stanza:up();
 138                                 end
 139                         end
 140                 end
 141         return xml_handlers;
 142 end
 143
 144 return init_xmlhandlers;