core/xmlhandlers.lua

   1 -- Prosody IM v0.2
   2 -- Copyright (C) 2008 Matthew Wild
   3 -- Copyright (C) 2008 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
  52                 local stanza
  53                 function xml_handlers:StartElement(tagname, attr)
  54                         if stanza and #chardata > 0 then
  55                                 -- We have some character data in the buffer
  56                                 stanza:text(t_concat(chardata));
  57                                 chardata = {};
  58                         end
  59                         local curr_ns,name = tagname:match("^(.+)|([%w%-]+)$");
  60                         if curr_ns ~= "jabber:server" then
  61                                 attr.xmlns = curr_ns;
  62                         end
  63
  64                         -- FIXME !!!!!
  65                         for i, k in ipairs(attr) do
  66                                 if type(k) == "string" then
  67                                         local ns, nm = k:match("^([^|]+)|?([^|]-)$")
  68                                         if ns and nm then
  69                                                 ns = ns_prefixes[ns];
  70                                                 if ns then
  71                                                         attr[ns..":"..nm] = attr[k];
  72                                                         attr[i] = ns..":"..nm;
  73                                                         attr[k] = nil;
  74                                                 end
  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                                 curr_tag = stanza;
  97                         else -- we are inside a stanza, so add a tag
  98                                 attr.xmlns = nil;
  99                                 if curr_ns ~= "jabber:server" and curr_ns ~= "jabber:client" then
 100                                         attr.xmlns = curr_ns;
 101                                 end
 102                                 stanza:tag(name, attr);
 103                         end
 104                 end
 105                 function xml_handlers:CharacterData(data)
 106                         if stanza then
 107                                 t_insert(chardata, data);
 108                         end
 109                 end
 110                 function xml_handlers:EndElement(tagname)
 111                         curr_ns,name = tagname:match("^(.+)|([%w%-]+)$");
 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 stanza and #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;