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-rw-r--r--plugins/mod_compression.lua129
1 files changed, 74 insertions, 55 deletions
diff --git a/plugins/mod_compression.lua b/plugins/mod_compression.lua
index aecfaedb..b7e4cd8c 100644
--- a/plugins/mod_compression.lua
+++ b/plugins/mod_compression.lua
@@ -65,6 +65,73 @@ module:hook_stanza(xmlns_stream, "features",
end
, 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)
+ 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
+ old_send(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
+
-- TODO Support compression on S2S level too.
module:add_handler({"s2sout_unauthed", "s2sout"}, "compressed", xmlns_compression_protocol,
function(session ,stanza)
@@ -89,70 +156,22 @@ module:add_handler({"c2s_unauthed", "c2s", "s2sin_unauthed", "s2sin"}, "compress
session:reset_stream();
-- create deflate and inflate streams
- 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
+ deflate_stream = get_deflate_stream(session);
+ if not deflate_stream then return end
- 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
+ inflate_stream = get_inflate_stream(session);
+ if not inflate_stream then return end
-- setup compression for session.w
- local function setup_compression(session)
- local old_send = (session.sends2s or session.send);
-
- local new_send = function(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
- old_send(compressed);
- end;
-
- if session.sends2s then session.sends2s = new_send
- elseif session.send then session.send = new_send end
- end
- setup_compression(session);
+ setup_compression(session, deflate_stream);
-- setup decompression for session.data
- local function setup_decompression(session)
- 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
- setup_decompression(session);
+ setup_decompression(session, inflate_stream);
local session_reset_stream = session.reset_stream;
session.reset_stream = function(session)
session_reset_stream(session);
- setup_decompression(session);
+ setup_decompression(session, inflate_stream);
return true;
end;
session.compressed = true;