diff options
Diffstat (limited to 'util')
| -rw-r--r-- | util/xmppstream.lua | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/util/xmppstream.lua b/util/xmppstream.lua new file mode 100644 index 00000000..f7744fea --- /dev/null +++ b/util/xmppstream.lua @@ -0,0 +1,150 @@ +-- 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 "util.stanza"; + +local tostring = tostring; +local t_insert = table.insert; +local t_concat = table.concat; + +local default_log = require "util.logger".init("xmlhandlers"); + +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 chardata = {}; + local xml_handlers = {}; + local log = session.log or default_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 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 + return xml_handlers; +end + +function new(session, stream_callbacks) + return new_parser(new_sax_handlers(session, stream_callbacks), ns_separator); +end + +return _M; |