prosody
cf103398e643
plugins/mod_compression.lua

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plugins/mod_compression.lua @ 1719:cf103398e643

Don't allow double compression.
author Tobias Markmann <tm@ayena.de>
date Tue, 18 Aug 2009 22:00:37 +0200
parent 1718:af3d0c329396
child 1728:cb4c94b47d53
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 pcall = pcall;
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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 local compression_level = module:get_option("compression_level");
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17
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18 -- if not defined assume admin wants best compression
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19 if compression_level == nil then compression_level = 9 end;
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20
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21 compression_level = tonumber(compression_level);
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22 if not compression_level or compression_level < 1 or compression_level > 9 then
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23 module:log("warn", "Invalid compression level in config: %s", tostring(compression_level));
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24 module:log("warn", "Module loading aborted. Compression won't be available.");
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25 return;
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26 end
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27
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28 module:add_event_hook("stream-features",
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29 function (session, features)
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30 if not session.compressed then
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31 -- FIXME only advertise compression support when TLS layer has no compression enabled
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32 features:add_child(compression_stream_feature);
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33 end
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34 end
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35 );
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36
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37 -- TODO Support compression on S2S level too.
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38 module:add_handler({"c2s_unauthed", "c2s_authed"}, "compress", xmlns_compression_protocol,
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39 function(session, stanza)
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40 -- fail if we are already compressed
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41 if session.compressed then
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42 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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43 session.send(error_st);
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44 session:log("warn", "Tried to establish another compression layer.");
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45 end
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46
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47 -- checking if the compression method is supported
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48 local method = stanza:child_with_name("method")[1];
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49 if method == "zlib" then
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50 session.log("info", method.." compression selected.");
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51 session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
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52 session:reset_stream();
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53
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54 -- create deflate and inflate streams
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55 local status, deflate_stream = pcall(zlib.deflate, compression_level);
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56 if status == false then
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57 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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58 session.send(error_st);
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59 session:log("error", "Failed to create zlib.deflate filter.");
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60 module:log("error", deflate_stream);
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61 return
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62 end
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63
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64 local status, inflate_stream = pcall(zlib.inflate);
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65 if status == false then
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66 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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67 session.send(error_st);
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68 session:log("error", "Failed to create zlib.deflate filter.");
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69 module:log("error", inflate_stream);
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70 return
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71 end
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72
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73 -- setup compression for session.w
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74 local old_send = session.send;
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75
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76 session.send = function(t)
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77 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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78 if status == false then
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79 session:close({
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80 condition = "undefined-condition";
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81 text = compressed;
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82 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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83 });
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84 module:log("warn", compressed);
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85 return;
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86 end
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87 old_send(compressed);
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88 end;
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89
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90 -- setup decompression for session.data
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91 local function setup_decompression(session)
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92 local old_data = session.data
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93 session.data = function(conn, data)
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94 local status, decompressed, eof = pcall(inflate_stream, data);
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95 if status == false then
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96 session:close({
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97 condition = "undefined-condition";
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98 text = decompressed;
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99 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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100 });
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101 module:log("warn", decompressed);
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102 return;
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103 end
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104 old_data(conn, decompressed);
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105 end;
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106 end
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107 setup_decompression(session);
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108
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109 local session_reset_stream = session.reset_stream;
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110 session.reset_stream = function(session)
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111 session_reset_stream(session);
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112 setup_decompression(session);
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113 return true;
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114 end;
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115 session.compressed = true;
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116 else
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117 session.log("info", method.." compression selected. But we don't support it.");
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118 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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119 session.send(error_st);
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120 end
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121 end
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122 );