+, 250);
+
+
+-- returns either nil or a fully functional ready to use inflate stream
+local function get_deflate_stream(session)
+ local status, deflate_stream = pcall(zlib.deflate, compression_level);
+ if status == false then
+ local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
+ (session.sends2s or session.send)(error_st);
+ session.log("error", "Failed to create zlib.deflate filter.");
+ module:log("error", deflate_stream);
+ return
+ end
+ return deflate_stream
+end
+
+-- returns either nil or a fully functional ready to use inflate stream
+local function get_inflate_stream(session)
+ local status, inflate_stream = pcall(zlib.inflate);
+ if status == false then
+ local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
+ (session.sends2s or session.send)(error_st);
+ session.log("error", "Failed to create zlib.deflate filter.");
+ module:log("error", inflate_stream);
+ return
+ end
+ return inflate_stream
+end
+
+-- setup compression for a stream
+local function setup_compression(session, deflate_stream)
+ local old_send = (session.sends2s or session.send);
+
+ local new_send = function(t)
+ --TODO: Better code injection in the sending process
+ session.log(t)
+ local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
+ if status == false then
+ session:close({
+ condition = "undefined-condition";
+ text = compressed;
+ extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
+ });
+ module:log("warn", compressed);
+ return;
+ end
+ session.conn:write(compressed);
+ end;
+
+ if session.sends2s then session.sends2s = new_send
+ elseif session.send then session.send = new_send end
+end
+
+-- setup decompression for a stream
+local function setup_decompression(session, inflate_stream)
+ local old_data = session.data
+ session.data = function(conn, data)
+ local status, decompressed, eof = pcall(inflate_stream, data);
+ if status == false then
+ session:close({
+ condition = "undefined-condition";
+ text = decompressed;
+ extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
+ });
+ module:log("warn", decompressed);
+ return;
+ end
+ old_data(conn, decompressed);
+ end;
+end
+
+module:add_handler({"s2sout_unauthed", "s2sout"}, "compressed", xmlns_compression_protocol,
+ function(session ,stanza)
+ session.log("debug", "Activating compression...")
+ -- create deflate and inflate streams
+ local deflate_stream = get_deflate_stream(session);
+ if not deflate_stream then return end
+
+ local inflate_stream = get_inflate_stream(session);
+ if not inflate_stream then return end
+
+ -- setup compression for session.w
+ setup_compression(session, deflate_stream);
+
+ -- setup decompression for session.data
+ setup_decompression(session, inflate_stream);
+ local session_reset_stream = session.reset_stream;
+ session.reset_stream = function(session)
+ session_reset_stream(session);
+ setup_decompression(session, inflate_stream);
+ return true;
+ end;
+ session:reset_stream();
+ local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams",
+ ["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host};
+ session.sends2s("<?xml version='1.0'?>");
+ session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
+ session.compressed = true;
+ end