verse
3aac084855e6
plugins/compression.lua

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plugins/compression.lua @ 216:3aac084855e6

plugins.pep: Reuse the pubsub plugin.
author Kim Alvefur <zash@zash.se>
date Thu, 08 Sep 2011 18:03:07 +0200
parent 197:7e98cf2c1d8d
child 250:a5ac643a7fd6
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1 -- Copyright (C) 2009-2010 Matthew Wild
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2 -- Copyright (C) 2009-2010 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 zlib = require "zlib";
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9
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10 local xmlns_compression_feature = "http://jabber.org/features/compress"
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11 local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
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12 local xmlns_stream = "http://etherx.jabber.org/streams";
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13
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14 local compression_level = 9;
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15
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16 -- returns either nil or a fully functional ready to use inflate stream
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17 local function get_deflate_stream(session)
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18 local status, deflate_stream = pcall(zlib.deflate, compression_level);
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19 if status == false then
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20 local error_st = verse.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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21 session:send(error_st);
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22 session:error("Failed to create zlib.deflate filter: %s", tostring(deflate_stream));
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23 return
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24 end
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25 return deflate_stream
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26 end
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27
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28 -- returns either nil or a fully functional ready to use inflate stream
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29 local function get_inflate_stream(session)
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30 local status, inflate_stream = pcall(zlib.inflate);
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31 if status == false then
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32 local error_st = verse.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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33 session:send(error_st);
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34 session:error("Failed to create zlib.inflate filter: %s", tostring(inflate_stream));
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35 return
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36 end
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37 return inflate_stream
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38 end
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39
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40 -- setup compression for a stream
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41 local function setup_compression(session, deflate_stream)
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42 function session:send(t)
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43 --TODO: Better code injection in the sending process
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44 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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45 if status == false then
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46 session:close({
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47 condition = "undefined-condition";
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48 text = compressed;
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49 extra = verse.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("processing-failed");
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50 });
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51 session:warn("Compressed send failed: %s", tostring(compressed));
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52 return;
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53 end
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54 session.conn:write(compressed);
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55 end;
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56 end
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57
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58 -- setup decompression for a stream
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59 local function setup_decompression(session, inflate_stream)
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60 local old_data = session.data
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61 session.data = function(conn, data)
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62 session:debug("Decompressing data...");
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63 local status, decompressed, eof = pcall(inflate_stream, data);
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64 if status == false then
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65 session:close({
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66 condition = "undefined-condition";
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67 text = decompressed;
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68 extra = verse.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("processing-failed");
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69 });
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70 stream:warn("%s", tostring(decompressed));
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71 return;
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72 end
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73 return old_data(conn, decompressed);
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74 end;
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75 end
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76
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77 function verse.plugins.compression(stream)
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78 local function handle_features(features)
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79 if not stream.compressed then
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80 -- does remote server support compression?
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81 local comp_st = features:child_with_name("compression");
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82 if comp_st then
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83 -- do we support the mechanism
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84 for a in comp_st:children() do
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85 local algorithm = a[1]
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86 if algorithm == "zlib" then
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87 stream:send(verse.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
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88 stream:debug("Enabled compression using zlib.")
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89 return true;
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90 end
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91 end
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92 session:debug("Remote server supports no compression algorithm we support.")
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93 end
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94 end
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95 end
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96 local function handle_compressed(stanza)
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97 if stanza.name == "compressed" then
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98 stream:debug("Activating compression...")
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99
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100 -- create deflate and inflate streams
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101 local deflate_stream = get_deflate_stream(stream);
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102 if not deflate_stream then return end
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103
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104 local inflate_stream = get_inflate_stream(stream);
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105 if not inflate_stream then return end
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106
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107 -- setup compression for stream.w
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108 setup_compression(stream, deflate_stream);
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109
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110 -- setup decompression for stream.data
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111 setup_decompression(stream, inflate_stream);
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112
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113 stream.compressed = true;
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114 stream:reopen();
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115 elseif stanza.name == "failure" then
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116 stream:warn("Failed to establish compression");
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117 end
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118 end
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119 stream:hook("stream-features", handle_features, 250);
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120 stream:hook("stream/"..xmlns_compression_protocol, handle_compressed);
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121 end