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-- Prosody IM
-- Copyright (C) 2009 Tobias Markmann
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local st = require "util.stanza";
local zlib = require "zlib";
local print = print
local xmlns_compression_feature = "http://jabber.org/features/compress"
local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up();
module:add_event_hook("stream-features",
function (session, features)
if not session.compressed then features:add_child(compression_stream_feature); end
end
);
module:add_handler("c2s_unauthed", "compress", xmlns_compression_protocol,
function(session, stanza)
-- checking if the compression method is supported
local method = stanza:child_with_name("method")[1];
if method == "zlib" then
session.log("info", method.." compression selected.");
session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
session:reset_stream();
-- create deflate and inflate streams
local deflate_stream = zlib.deflate(9);
local inflate_stream = zlib.inflate();
-- setup compression for session.w
local old_send = session.send;
session.send = function(t)
local compressed, eof = deflate_stream(tostring(t), 'sync');
old_send(compressed);
end;
-- setup decompression for session.data
local function setup_decompression(session)
local old_data = session.data
session.data = function(conn, data)
local decompressed, eof = inflate_stream(data);
old_data(conn, decompressed);
end;
end
setup_decompression(session);
local session_reset_stream = session.reset_stream;
session.reset_stream = function(session)
session_reset_stream(session);
setup_decompression(session);
return true;
end;
session.compressed = true;
else
session.log("info", method.." compression selected. But we don't support it.");
local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
session.send(error_st);
end
end
);
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