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-rw-r--r--plugins/mod_compression.lua34
1 files changed, 33 insertions, 1 deletions
diff --git a/plugins/mod_compression.lua b/plugins/mod_compression.lua
index d5df2578..bb2a7e5d 100644
--- a/plugins/mod_compression.lua
+++ b/plugins/mod_compression.lua
@@ -6,6 +6,7 @@
--
local st = require "util.stanza";
+local zlib = require "zlib";
local print = print
local xmlns_compression_feature = "http://jabber.org/features/compress"
@@ -15,7 +16,7 @@ local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compres
module:add_event_hook("stream-features",
function (session, features)
- features:add_child(compression_stream_feature);
+ if not session.compressed then features:add_child(compression_stream_feature); end
end
);
@@ -26,6 +27,37 @@ module:add_handler("c2s_unauthed", "compress", xmlns_compression_protocol,
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");