prosody
d196ac213104
plugins/mod_compression.lua

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plugins/mod_compression.lua @ 1671:d196ac213104

Actually inject de- and compression into the reading/writing functions.
author Tobias Markmann <tm@ayena.de>
date Thu, 13 Aug 2009 09:34:27 +0200
parent 1670:23bb280c5eac
child 1672:614623f393c6
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1670:23bb280c5eac 1671:d196ac213104
4 -- This project is MIT/X11 licensed. Please see the 4 -- This project is MIT/X11 licensed. Please see the
5 -- COPYING file in the source package for more information. 5 -- COPYING file in the source package for more information.
6 -- 6 --
7 7
8 local st = require "util.stanza"; 8 local st = require "util.stanza";
9 local zlib = require "zlib";
9 local print = print 10 local print = print
10 11
11 local xmlns_compression_feature = "http://jabber.org/features/compress" 12 local xmlns_compression_feature = "http://jabber.org/features/compress"
12 local xmlns_compression_protocol = "http://jabber.org/protocol/compress" 13 local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
13 local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up(); 14 local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up();
14 15
15 16
16 module:add_event_hook("stream-features", 17 module:add_event_hook("stream-features",
17 function (session, features) 18 function (session, features)
18 features:add_child(compression_stream_feature); 19 if not session.compressed then features:add_child(compression_stream_feature); end
19 end 20 end
20 ); 21 );
21 22
22 module:add_handler("c2s_unauthed", "compress", xmlns_compression_protocol, 23 module:add_handler("c2s_unauthed", "compress", xmlns_compression_protocol,
23 function(session, stanza) 24 function(session, stanza)
24 -- checking if the compression method is supported 25 -- checking if the compression method is supported
25 local method = stanza:child_with_name("method")[1]; 26 local method = stanza:child_with_name("method")[1];
26 if method == "zlib" then 27 if method == "zlib" then
27 session.log("info", method.." compression selected."); 28 session.log("info", method.." compression selected.");
28 session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol})); 29 session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
30 session:reset_stream();
31
32 -- create deflate and inflate streams
33 local deflate_stream = zlib.deflate(9);
34 local inflate_stream = zlib.inflate();
35
36 -- setup compression for session.w
37 local old_send = session.send;
38
39 session.send = function(t)
40 local compressed, eof = deflate_stream(tostring(t), 'sync');
41 old_send(compressed);
42 end;
43
44 -- setup decompression for session.data
45 local function setup_decompression(session)
46 local old_data = session.data
47 session.data = function(conn, data)
48 local decompressed, eof = inflate_stream(data);
49 old_data(conn, decompressed);
50 end;
51 end
52 setup_decompression(session);
53
54 local session_reset_stream = session.reset_stream;
55 session.reset_stream = function(session)
56 session_reset_stream(session);
57 setup_decompression(session);
58 return true;
59 end;
60 session.compressed = true;
29 else 61 else
30 session.log("info", method.." compression selected. But we don't support it."); 62 session.log("info", method.." compression selected. But we don't support it.");
31 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method"); 63 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
32 session.send(error_st); 64 session.send(error_st);
33 end 65 end