core/xmlhandlers.lua

   1
   2 require "util.stanza"
   3
   4 local st = stanza;
   5 local tostring = tostring;
   6 local pairs = pairs;
   7 local ipairs = ipairs;
   8 local type = type;
   9 local print = print;
  10 local format = string.format;
  11 local m_random = math.random;
  12 local t_insert = table.insert;
  13 local t_remove = table.remove;
  14 local t_concat = table.concat;
  15 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
  16 local sm_destroy_session = import("core.sessionmanager", "destroy_session");
  17
  18 local default_log = require "util.logger".init("xmlhandlers");
  19
  20 local error = error;
  21
  22 module "xmlhandlers"
  23
  24 local ns_prefixes = {
  25                                                 ["http://www.w3.org/XML/1998/namespace"] = "xml";
  26                                 }
  27
  28 function init_xmlhandlers(session, stream_callbacks)
  29                 local ns_stack = { "" };
  30                 local curr_ns = "";
  31                 local curr_tag;
  32                 local chardata = {};
  33                 local xml_handlers = {};
  34                 local log = session.log or default_log;
  35                 --local print = function (...) log("info", "xmlhandlers", t_concatall({...}, "\t")); end
  36
  37                 local send = session.send;
  38
  39                 local cb_streamopened = stream_callbacks.streamopened;
  40                 local cb_streamclosed = stream_callbacks.streamclosed;
  41
  42                 local stanza
  43                 function xml_handlers:StartElement(name, attr)
  44                         if stanza and #chardata > 0 then
  45                                 -- We have some character data in the buffer
  46                                 stanza:text(t_concat(chardata));
  47                                 chardata = {};
  48                         end
  49                         curr_ns,name = name:match("^(.+)|([%w%-]+)$");
  50                         if curr_ns ~= "jabber:server" then
  51                                 attr.xmlns = curr_ns;
  52                         end
  53
  54                         -- FIXME !!!!!
  55                         for i, k in ipairs(attr) do
  56                                 if type(k) == "string" then
  57                                         local ns, nm = k:match("^([^|]+)|?([^|]-)$")
  58                                         if ns and nm then
  59                                                 ns = ns_prefixes[ns];
  60                                                 if ns then
  61                                                         attr[ns..":"..nm] = attr[k];
  62                                                         attr[i] = ns..":"..nm;
  63                                                         attr[k] = nil;
  64                                                 end
  65                                         end
  66                                 end
  67                         end
  68
  69                         if not stanza then --if we are not currently inside a stanza
  70                                 if session.notopen then
  71                                         if name == "stream" then
  72                                                 if cb_streamopened then
  73                                                         cb_streamopened(session, attr);
  74                                                 end
  75                                                 return;
  76                                         end
  77                                         error("Client failed to open stream successfully");
  78                                 end
  79                                 if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
  80                                         error("Client sent invalid top-level stanza");
  81                                 end
  82
  83                                 stanza = st.stanza(name, attr);
  84                                 curr_tag = stanza;
  85                         else -- we are inside a stanza, so add a tag
  86                                 attr.xmlns = nil;
  87                                 if curr_ns ~= "jabber:server" and curr_ns ~= "jabber:client" then
  88                                         attr.xmlns = curr_ns;
  89                                 end
  90                                 stanza:tag(name, attr);
  91                         end
  92                 end
  93                 function xml_handlers:CharacterData(data)
  94                         if stanza then
  95                                 t_insert(chardata, data);
  96                         end
  97                 end
  98                 function xml_handlers:EndElement(name)
  99                         curr_ns,name = name:match("^(.+)|([%w%-]+)$");
 100                         if (not stanza) or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then
 101                                 if name == "stream" then
 102                                         log("debug", "Stream closed");
 103                                         if cb_streamclosed then
 104                                                 cb_streamclosed(session);
 105                                         end
 106                                         return;
 107                                 elseif name == "error" then
 108                                         error("Stream error: "..tostring(name)..": "..tostring(stanza));
 109                                 else
 110                                         error("XML parse error in client stream with element: "..name);
 111                                 end
 112                         end
 113                         if stanza and #chardata > 0 then
 114                                 -- We have some character data in the buffer
 115                                 stanza:text(t_concat(chardata));
 116                                 chardata = {};
 117                         end
 118                         -- Complete stanza
 119                         if #stanza.last_add == 0 then
 120                                 session.stanza_dispatch(stanza);
 121                                 stanza = nil;
 122                         else
 123                                 stanza:up();
 124                         end
 125                 end
 126         return xml_handlers;
 127 end
 128
 129 return init_xmlhandlers;