prosody
250bddde4162
plugins/mod_compression.lua

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plugins/mod_compression.lua @ 1674:250bddde4162

Add a TODO for s2s compression support.
author Tobias Markmann <tm@ayena.de>
date Thu, 13 Aug 2009 10:57:56 +0200
parent 1673:5f81cd6d4a92
child 1676:719350956714
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1 -- Prosody IM
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2 -- Copyright (C) 2009 Tobias Markmann
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7
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8 local st = require "util.stanza";
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9 local zlib = require "zlib";
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10 local print = print
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11
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12 local xmlns_compression_feature = "http://jabber.org/features/compress"
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13 local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
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14 local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up();
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15
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16
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17 module:add_event_hook("stream-features",
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18 function (session, features)
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19 if not session.compressed then
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20 -- FIXME only advertise compression support when TLS layer has no compression enabled
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21 features:add_child(compression_stream_feature);
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22 end
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23 end
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24 );
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25
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26 -- TODO Support compression on S2S level too.
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27 module:add_handler("c2s_unauthed", "compress", xmlns_compression_protocol,
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28 function(session, stanza)
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29 -- checking if the compression method is supported
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30 local method = stanza:child_with_name("method")[1];
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31 if method == "zlib" then
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32 session.log("info", method.." compression selected.");
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33 session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
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34 session:reset_stream();
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35
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36 -- create deflate and inflate streams
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37 local deflate_stream = zlib.deflate(9);
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38 local inflate_stream = zlib.inflate();
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39
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40 -- setup compression for session.w
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41 local old_send = session.send;
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42
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43 session.send = function(t)
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44 local compressed, eof = deflate_stream(tostring(t), 'sync');
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45 old_send(compressed);
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46 end;
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47
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48 -- setup decompression for session.data
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49 local function setup_decompression(session)
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50 local old_data = session.data
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51 session.data = function(conn, data)
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52 local decompressed, eof = inflate_stream(data);
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53 old_data(conn, decompressed);
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54 end;
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55 end
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56 setup_decompression(session);
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57
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58 local session_reset_stream = session.reset_stream;
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59 session.reset_stream = function(session)
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60 session_reset_stream(session);
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61 setup_decompression(session);
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62 return true;
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63 end;
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64 session.compressed = true;
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65 else
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66 session.log("info", method.." compression selected. But we don't support it.");
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67 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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68 session.send(error_st);
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69 end
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70 end
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71 );