core/xmlhandlers.lua

   1 -- Prosody IM v0.2
   2 -- Copyright (C) 2008 Matthew Wild
   3 -- Copyright (C) 2008 Waqas Hussain
   4 --
   5 -- This program is free software; you can redistribute it and/or
   6 -- modify it under the terms of the GNU General Public License
   7 -- as published by the Free Software Foundation; either version 2
   8 -- of the License, or (at your option) any later version.
   9 --
  10 -- This program is distributed in the hope that it will be useful,
  11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 -- GNU General Public License for more details.
  14 --
  15 -- You should have received a copy of the GNU General Public License
  16 -- along with this program; if not, write to the Free Software
  17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 --
  19
  20
  21
  22 require "util.stanza"
  23
  24 local st = stanza;
  25 local tostring = tostring;
  26 local pairs = pairs;
  27 local ipairs = ipairs;
  28 local type = type;
  29 local print = print;
  30 local format = string.format;
  31 local m_random = math.random;
  32 local t_insert = table.insert;
  33 local t_remove = table.remove;
  34 local t_concat = table.concat;
  35 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
  36 local sm_destroy_session = import("core.sessionmanager", "destroy_session");
  37
  38 local default_log = require "util.logger".init("xmlhandlers");
  39
  40 local error = error;
  41
  42 module "xmlhandlers"
  43
  44 local ns_prefixes = {
  45                                                 ["http://www.w3.org/XML/1998/namespace"] = "xml";
  46                                 }
  47
  48 function init_xmlhandlers(session, stream_callbacks)
  49                 local ns_stack = { "" };
  50                 local curr_ns = "";
  51                 local curr_tag;
  52                 local chardata = {};
  53                 local xml_handlers = {};
  54                 local log = session.log or default_log;
  55
  56                 local send = session.send;
  57
  58                 local cb_streamopened = stream_callbacks.streamopened;
  59                 local cb_streamclosed = stream_callbacks.streamclosed;
  60                 local cb_error = stream_callbacks.error or function (session, e) error("XML stream error: "..tostring(e)); end;
  61                 local cb_handlestanza = stream_callbacks.handlestanza;
  62
  63                 local stream_ns = stream_callbacks.ns;
  64
  65                 local stanza
  66                 function xml_handlers:StartElement(name, attr)
  67                         if stanza and #chardata > 0 then
  68                                 -- We have some character data in the buffer
  69                                 stanza:text(t_concat(chardata));
  70                                 chardata = {};
  71                         end
  72                         curr_ns,name = name:match("^(.+)|([%w%-]+)$");
  73                         if curr_ns ~= "jabber:server" then
  74                                 attr.xmlns = curr_ns;
  75                         end
  76
  77                         -- FIXME !!!!!
  78                         for i, k in ipairs(attr) do
  79                                 if type(k) == "string" then
  80                                         local ns, nm = k:match("^([^|]+)|?([^|]-)$")
  81                                         if ns and nm then
  82                                                 ns = ns_prefixes[ns];
  83                                                 if ns then
  84                                                         attr[ns..":"..nm] = attr[k];
  85                                                         attr[i] = ns..":"..nm;
  86                                                         attr[k] = nil;
  87                                                 end
  88                                         end
  89                                 end
  90                         end
  91
  92                         if not stanza then --if we are not currently inside a stanza
  93                                 if session.notopen then
  94                                         if name == "stream" and curr_ns == stream_ns then
  95                                                 if cb_streamopened then
  96                                                         cb_streamopened(session, attr);
  97                                                 end
  98                                         else
  99                                                 -- Garbage before stream?
 100                                                 cb_error(session, "no-stream");
 101                                         end
 102                                         return;
 103                                 end
 104                                 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
 105                                         cb_error(session, "invalid-top-level-element");
 106                                 end
 107
 108                                 stanza = st.stanza(name, attr);
 109                                 curr_tag = stanza;
 110                         else -- we are inside a stanza, so add a tag
 111                                 attr.xmlns = nil;
 112                                 if curr_ns ~= "jabber:server" and curr_ns ~= "jabber:client" then
 113                                         attr.xmlns = curr_ns;
 114                                 end
 115                                 stanza:tag(name, attr);
 116                         end
 117                 end
 118                 function xml_handlers:CharacterData(data)
 119                         if stanza then
 120                                 t_insert(chardata, data);
 121                         end
 122                 end
 123                 function xml_handlers:EndElement(name)
 124                         curr_ns,name = name:match("^(.+)|([%w%-]+)$");
 125                         if (not stanza) or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then
 126                                 if name == "stream" then
 127                                         if cb_streamclosed then
 128                                                 cb_streamclosed(session);
 129                                         end
 130                                         return;
 131                                 elseif name == "error" then
 132                                         cb_error(session, "stream-error", stanza);
 133                                 else
 134                                         cb_error(session, "parse-error", "unexpected-element-close", name);
 135                                 end
 136                         end
 137                         if stanza and #chardata > 0 then
 138                                 -- We have some character data in the buffer
 139                                 stanza:text(t_concat(chardata));
 140                                 chardata = {};
 141                         end
 142                         -- Complete stanza
 143                         if #stanza.last_add == 0 then
 144                                 cb_handlestanza(session, stanza);
 145                                 stanza = nil;
 146                         else
 147                                 stanza:up();
 148                         end
 149                 end
 150         return xml_handlers;
 151 end
 152
 153 return init_xmlhandlers;