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 print = print;
  19 local format = string.format;
  20 local m_random = math.random;
  21 local t_insert = table.insert;
  22 local t_remove = table.remove;
  23 local t_concat = table.concat;
  24 local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
  25 local sm_destroy_session = import("core.sessionmanager", "destroy_session");
  26
  27 local default_log = require "util.logger".init("xmlhandlers");
  28
  29 local error = error;
  30
  31 module "xmlhandlers"
  32
  33 local ns_prefixes = {
  34                                                 ["http://www.w3.org/XML/1998/namespace"] = "xml";
  35                                 }
  36
  37 function init_xmlhandlers(session, stream_callbacks)
  38                 local ns_stack = { "" };
  39                 local curr_ns, name = "";
  40                 local curr_tag;
  41                 local chardata = {};
  42                 local xml_handlers = {};
  43                 local log = session.log or default_log;
  44
  45                 local cb_streamopened = stream_callbacks.streamopened;
  46                 local cb_streamclosed = stream_callbacks.streamclosed;
  47                 local cb_error = stream_callbacks.error or function (session, e) error("XML stream error: "..tostring(e)); end;
  48                 local cb_handlestanza = stream_callbacks.handlestanza;
  49
  50                 local stream_tag = stream_callbacks.stream_tag;
  51                 local stream_default_ns = stream_callbacks.default_ns;
  52
  53                 local stanza
  54                 function xml_handlers:StartElement(tagname, attr)
  55                         if stanza and #chardata > 0 then
  56                                 -- We have some character data in the buffer
  57                                 stanza:text(t_concat(chardata));
  58                                 chardata = {};
  59                         end
  60                         local curr_ns,name = tagname:match("^(.-)|?([^%|]-)$");
  61                         if not name then
  62                                 curr_ns, name = "", curr_ns;
  63                         end
  64
  65                         if curr_ns ~= stream_default_ns then
  66                                 attr.xmlns = curr_ns;
  67                         end
  68
  69                         -- FIXME !!!!!
  70                         for i, k in ipairs(attr) do
  71                                 if type(k) == "string" then
  72                                         local ns, nm = k:match("^([^|]+)|?([^|]-)$")
  73                                         if ns and nm then
  74                                                 ns = ns_prefixes[ns];
  75                                                 if ns then
  76                                                         attr[ns..":"..nm] = attr[k];
  77                                                         attr[i] = ns..":"..nm;
  78                                                         attr[k] = nil;
  79                                                 end
  80                                         end
  81                                 end
  82                         end
  83
  84                         if not stanza then --if we are not currently inside a stanza
  85                                 if session.notopen then
  86                                         if tagname == stream_tag then
  87                                                 if cb_streamopened then
  88                                                         cb_streamopened(session, attr);
  89                                                 end
  90                                         else
  91                                                 -- Garbage before stream?
  92                                                 cb_error(session, "no-stream");
  93                                         end
  94                                         return;
  95                                 end
  96                                 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
  97                                         cb_error(session, "invalid-top-level-element");
  98                                 end
  99
 100                                 stanza = st.stanza(name, attr);
 101                                 curr_tag = stanza;
 102                         else -- we are inside a stanza, so add a tag
 103                                 attr.xmlns = nil;
 104                                 if curr_ns ~= stream_default_ns then
 105                                         attr.xmlns = curr_ns;
 106                                 end
 107                                 stanza:tag(name, attr);
 108                         end
 109                 end
 110                 function xml_handlers:CharacterData(data)
 111                         if stanza then
 112                                 t_insert(chardata, data);
 113                         end
 114                 end
 115                 function xml_handlers:EndElement(tagname)
 116                         curr_ns,name = tagname:match("^(.-)|?([^%|]-)$");
 117                         if not name then
 118                                 curr_ns, name = "", curr_ns;
 119                         end
 120                         if (not stanza) or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then
 121                                 if tagname == stream_tag then
 122                                         if cb_streamclosed then
 123                                                 cb_streamclosed(session);
 124                                         end
 125                                         return;
 126                                 elseif name == "error" then
 127                                         cb_error(session, "stream-error", stanza);
 128                                 else
 129                                         cb_error(session, "parse-error", "unexpected-element-close", name);
 130                                 end
 131                         end
 132                         if stanza then
 133                                 if #chardata > 0 then
 134                                         -- We have some character data in the buffer
 135                                         stanza:text(t_concat(chardata));
 136                                         chardata = {};
 137                                 end
 138                                 -- Complete stanza
 139                                 if #stanza.last_add == 0 then
 140                                         cb_handlestanza(session, stanza);
 141                                         stanza = nil;
 142                                 else
 143                                         stanza:up();
 144                                 end
 145                         end
 146                 end
 147         return xml_handlers;
 148 end
 149
 150 return init_xmlhandlers;