prosody
70275ab52ab2
plugins/mod_compression.lua

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plugins/mod_compression.lua @ 4451:70275ab52ab2

configure: Add 'openbsd' preset (thanks xavier)
author Matthew Wild <mwild1@gmail.com>
date Sun, 11 Dec 2011 17:08:34 +0000
parent 3540:bc139431830b
child 4480:187ce118aea6
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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 local tostring = tostring;
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12
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13 local xmlns_compression_feature = "http://jabber.org/features/compress"
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14 local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
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15 local xmlns_stream = "http://etherx.jabber.org/streams";
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16 local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up();
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17 local add_filter = require "util.filters".add_filter;
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18
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19 local compression_level = module:get_option("compression_level");
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20 -- if not defined assume admin wants best compression
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21 if compression_level == nil then compression_level = 9 end;
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22
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23
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24 compression_level = tonumber(compression_level);
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25 if not compression_level or compression_level < 1 or compression_level > 9 then
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26 module:log("warn", "Invalid compression level in config: %s", tostring(compression_level));
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27 module:log("warn", "Module loading aborted. Compression won't be available.");
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28 return;
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29 end
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30
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31 module:hook("stream-features", function(event)
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32 local origin, features = event.origin, event.features;
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33 if not origin.compressed then
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34 -- FIXME only advertise compression support when TLS layer has no compression enabled
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35 features:add_child(compression_stream_feature);
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36 end
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37 end);
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38
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39 module:hook("s2s-stream-features", function(event)
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40 local origin, features = event.origin, event.features;
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41 -- FIXME only advertise compression support when TLS layer has no compression enabled
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42 if not origin.compressed then
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43 features:add_child(compression_stream_feature);
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44 end
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45 end);
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46
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47 -- Hook to activate compression if remote server supports it.
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48 module:hook_stanza(xmlns_stream, "features",
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49 function (session, stanza)
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50 if not session.compressed then
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51 -- does remote server support compression?
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52 local comp_st = stanza:child_with_name("compression");
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53 if comp_st then
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54 -- do we support the mechanism
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55 for a in comp_st:children() do
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56 local algorithm = a[1]
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57 if algorithm == "zlib" then
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58 session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
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59 session.log("debug", "Enabled compression using zlib.")
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60 return true;
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61 end
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62 end
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63 session.log("debug", "Remote server supports no compression algorithm we support.")
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64 end
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65 end
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66 end
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67 , 250);
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68
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69
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70 -- returns either nil or a fully functional ready to use inflate stream
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71 local function get_deflate_stream(session)
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72 local status, deflate_stream = pcall(zlib.deflate, compression_level);
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73 if status == false then
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74 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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75 (session.sends2s or session.send)(error_st);
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76 session.log("error", "Failed to create zlib.deflate filter.");
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77 module:log("error", "%s", tostring(deflate_stream));
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78 return
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79 end
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80 return deflate_stream
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81 end
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82
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83 -- returns either nil or a fully functional ready to use inflate stream
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84 local function get_inflate_stream(session)
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85 local status, inflate_stream = pcall(zlib.inflate);
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86 if status == false then
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87 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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88 (session.sends2s or session.send)(error_st);
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89 session.log("error", "Failed to create zlib.inflate filter.");
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90 module:log("error", "%s", tostring(inflate_stream));
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91 return
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92 end
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93 return inflate_stream
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94 end
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95
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96 -- setup compression for a stream
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97 local function setup_compression(session, deflate_stream)
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98 add_filter(session, "bytes/out", function(t)
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99 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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100 if status == false then
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101 module:log("warn", "%s", tostring(compressed));
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102 session:close({
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103 condition = "undefined-condition";
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104 text = compressed;
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105 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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106 });
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107 return;
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108 end
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109 return compressed;
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110 end);
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111 end
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112
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113 -- setup decompression for a stream
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114 local function setup_decompression(session, inflate_stream)
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115 add_filter(session, "bytes/in", function(data)
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116 local status, decompressed, eof = pcall(inflate_stream, data);
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117 if status == false then
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118 module:log("warn", "%s", tostring(decompressed));
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119 session:close({
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120 condition = "undefined-condition";
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121 text = decompressed;
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122 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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123 });
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124 return;
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125 end
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126 return decompressed;
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127 end);
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128 end
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129
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130 module:hook("stanza/http://jabber.org/protocol/compress:compressed", function(event)
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131 local session = event.origin;
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132
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133 if session.type == "s2sout_unauthed" or session.type == "s2sout" then
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134 session.log("debug", "Activating compression...")
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135 -- create deflate and inflate streams
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136 local deflate_stream = get_deflate_stream(session);
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137 if not deflate_stream then return true; end
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138
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139 local inflate_stream = get_inflate_stream(session);
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140 if not inflate_stream then return true; end
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141
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142 -- setup compression for session.w
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143 setup_compression(session, deflate_stream);
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144
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145 -- setup decompression for session.data
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146 setup_decompression(session, inflate_stream);
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147 session:reset_stream();
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148 local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams",
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149 ["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host};
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150 session.sends2s("<?xml version='1.0'?>");
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151 session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
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152 session.compressed = true;
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153 return true;
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154 end
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155 end);
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156
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157 module:hook("stanza/http://jabber.org/protocol/compress:compress", function(event)
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158 local session, stanza = event.origin, event.stanza;
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159
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160 if session.type == "c2s" or session.type == "s2sin" or session.type == "c2s_unauthed" or session.type == "s2sin_unauthed" then
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161 -- fail if we are already compressed
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162 if session.compressed then
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163 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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164 (session.sends2s or session.send)(error_st);
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165 session.log("debug", "Client tried to establish another compression layer.");
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166 return true;
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167 end
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168
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169 -- checking if the compression method is supported
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170 local method = stanza:child_with_name("method");
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171 method = method and (method[1] or "");
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172 if method == "zlib" then
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173 session.log("debug", "zlib compression enabled.");
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174
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175 -- create deflate and inflate streams
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176 local deflate_stream = get_deflate_stream(session);
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177 if not deflate_stream then return true; end
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178
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179 local inflate_stream = get_inflate_stream(session);
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180 if not inflate_stream then return true; end
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181
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182 (session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
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183 session:reset_stream();
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184
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185 -- setup compression for session.w
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186 setup_compression(session, deflate_stream);
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187
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188 -- setup decompression for session.data
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189 setup_decompression(session, inflate_stream);
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190
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191 session.compressed = true;
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192 elseif method then
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193 session.log("debug", "%s compression selected, but we don't support it.", tostring(method));
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194 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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195 (session.sends2s or session.send)(error_st);
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196 else
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197 (session.sends2s or session.send)(st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"));
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198 end
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199 return true;
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200 end
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201 end);
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202