--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xmppstream.lua Sat Jul 17 02:52:26 2010 +0100
@@ -0,0 +1,166 @@
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+
+local lxp = require "lxp";
+local st = require "stanza";
+
+local tostring = tostring;
+local t_insert = table.insert;
+local t_concat = table.concat;
+
+local error = error;
+
+module "xmppstream"
+
+local new_parser = lxp.new;
+
+local ns_prefixes = {
+ ["http://www.w3.org/XML/1998/namespace"] = "xml";
+};
+
+local xmlns_streams = "http://etherx.jabber.org/streams";
+
+local ns_separator = "\1";
+local ns_pattern = "^([^"..ns_separator.."]*)"..ns_separator.."?(.*)$";
+
+function new_sax_handlers(session, stream_callbacks)
+ local xml_handlers = {};
+
+ local log = session.log;
+
+ local cb_streamopened = stream_callbacks.streamopened;
+ local cb_streamclosed = stream_callbacks.streamclosed;
+ local cb_error = stream_callbacks.error or function(session, e) error("XML stream error: "..tostring(e)); end;
+ local cb_handlestanza = stream_callbacks.handlestanza;
+
+ local stream_ns = stream_callbacks.stream_ns or xmlns_streams;
+ local stream_tag = stream_ns..ns_separator..(stream_callbacks.stream_tag or "stream");
+ local stream_error_tag = stream_ns..ns_separator..(stream_callbacks.error_tag or "error");
+
+ local stream_default_ns = stream_callbacks.default_ns;
+
+ local chardata, stanza = {};
+ function xml_handlers:StartElement(tagname, attr)
+ if stanza and #chardata > 0 then
+ -- We have some character data in the buffer
+ stanza:text(t_concat(chardata));
+ chardata = {};
+ end
+ local curr_ns,name = tagname:match(ns_pattern);
+ if name == "" then
+ curr_ns, name = "", curr_ns;
+ end
+
+ if curr_ns ~= stream_default_ns then
+ attr.xmlns = curr_ns;
+ end
+
+ -- FIXME !!!!!
+ for i=1,#attr do
+ local k = attr[i];
+ attr[i] = nil;
+ local ns, nm = k:match(ns_pattern);
+ if nm ~= "" then
+ ns = ns_prefixes[ns];
+ if ns then
+ attr[ns..":"..nm] = attr[k];
+ attr[k] = nil;
+ end
+ end
+ end
+
+ if not stanza then --if we are not currently inside a stanza
+ if session.notopen then
+ if tagname == stream_tag then
+ if cb_streamopened then
+ cb_streamopened(session, attr);
+ end
+ else
+ -- Garbage before stream?
+ cb_error(session, "no-stream");
+ end
+ return;
+ end
+ if curr_ns == "jabber:client" and name ~= "iq" and name ~= "presence" and name ~= "message" then
+ cb_error(session, "invalid-top-level-element");
+ end
+
+ stanza = st.stanza(name, attr);
+ else -- we are inside a stanza, so add a tag
+ attr.xmlns = nil;
+ if curr_ns ~= stream_default_ns then
+ attr.xmlns = curr_ns;
+ end
+ stanza:tag(name, attr);
+ end
+ end
+ function xml_handlers:CharacterData(data)
+ if stanza then
+ t_insert(chardata, data);
+ end
+ end
+ function xml_handlers:EndElement(tagname)
+ if stanza then
+ if #chardata > 0 then
+ -- We have some character data in the buffer
+ stanza:text(t_concat(chardata));
+ chardata = {};
+ end
+ -- Complete stanza
+ if #stanza.last_add == 0 then
+ if tagname ~= stream_error_tag then
+ cb_handlestanza(session, stanza);
+ else
+ cb_error(session, "stream-error", stanza);
+ end
+ stanza = nil;
+ else
+ stanza:up();
+ end
+ else
+ if tagname == stream_tag then
+ if cb_streamclosed then
+ cb_streamclosed(session);
+ end
+ else
+ local curr_ns,name = tagname:match(ns_pattern);
+ if name == "" then
+ curr_ns, name = "", curr_ns;
+ end
+ cb_error(session, "parse-error", "unexpected-element-close", name);
+ end
+ stanza, chardata = nil, {};
+ end
+ end
+
+ local function reset()
+ stanza, chardata = nil, {};
+ end
+
+ return xml_handlers, { reset = reset };
+end
+
+function new(session, stream_callbacks)
+ local handlers, meta = new_sax_handlers(session, stream_callbacks);
+ local parser = new_parser(handlers, ns_separator);
+ local parse = parser.parse;
+
+ return {
+ reset = function ()
+ parser = new_parser(handlers, ns_separator);
+ parse = parser.parse;
+ meta.reset();
+ end,
+ feed = function (self, data)
+ return parse(parser, data);
+ end
+ };
+end
+
+return _M;