prosody
39a870ae75d9
plugins/mod_compression.lua

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plugins/mod_compression.lua @ 3071:39a870ae75d9

mod_bosh: Re-layout session object creation to make lines shorter
author Matthew Wild <mwild1@gmail.com>
date Fri, 21 May 2010 19:27:06 +0100
parent 2892:9f214431de29
child 3127:94639081f327
child 3200:fd2389a240a2
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 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
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18 local compression_level = module:get_option("compression_level");
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19 -- if not defined assume admin wants best compression
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20 if compression_level == nil then compression_level = 9 end;
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21
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22
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23 compression_level = tonumber(compression_level);
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24 if not compression_level or compression_level < 1 or compression_level > 9 then
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25 module:log("warn", "Invalid compression level in config: %s", tostring(compression_level));
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26 module:log("warn", "Module loading aborted. Compression won't be available.");
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27 return;
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28 end
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29
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30 module:hook("stream-features", function(event)
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31 local origin, features = event.origin, event.features;
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32 if not origin.compressed then
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33 -- FIXME only advertise compression support when TLS layer has no compression enabled
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34 features:add_child(compression_stream_feature);
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35 end
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36 end);
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37
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38 module:hook("s2s-stream-features", function(event)
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39 local origin, features = event.origin, event.features;
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40 -- FIXME only advertise compression support when TLS layer has no compression enabled
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41 if not origin.compressed then
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42 features:add_child(compression_stream_feature);
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43 end
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44 end);
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45
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46 -- Hook to activate compression if remote server supports it.
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47 module:hook_stanza(xmlns_stream, "features",
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48 function (session, stanza)
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49 if not session.compressed then
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50 -- does remote server support compression?
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51 local comp_st = stanza:child_with_name("compression");
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52 if comp_st then
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53 -- do we support the mechanism
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54 for a in comp_st:children() do
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55 local algorithm = a[1]
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56 if algorithm == "zlib" then
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57 session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
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58 session.log("info", "Enabled compression using zlib.")
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59 return true;
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60 end
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61 end
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62 session.log("debug", "Remote server supports no compression algorithm we support.")
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63 end
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64 end
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65 end
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66 , 250);
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67
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68
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69 -- returns either nil or a fully functional ready to use inflate stream
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70 local function get_deflate_stream(session)
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71 local status, deflate_stream = pcall(zlib.deflate, compression_level);
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72 if status == false then
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73 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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74 (session.sends2s or session.send)(error_st);
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75 session.log("error", "Failed to create zlib.deflate filter.");
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76 module:log("error", "%s", tostring(deflate_stream));
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77 return
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78 end
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79 return deflate_stream
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80 end
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81
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82 -- returns either nil or a fully functional ready to use inflate stream
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83 local function get_inflate_stream(session)
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84 local status, inflate_stream = pcall(zlib.inflate);
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85 if status == false then
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86 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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87 (session.sends2s or session.send)(error_st);
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88 session.log("error", "Failed to create zlib.inflate filter.");
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89 module:log("error", "%s", tostring(inflate_stream));
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90 return
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91 end
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92 return inflate_stream
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93 end
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94
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95 -- setup compression for a stream
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96 local function setup_compression(session, deflate_stream)
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97 local old_send = (session.sends2s or session.send);
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98
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99 local new_send = function(t)
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100 --TODO: Better code injection in the sending process
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101 session.log(t)
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102 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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103 if status == false then
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104 session:close({
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105 condition = "undefined-condition";
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106 text = compressed;
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107 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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108 });
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109 module:log("warn", "%s", tostring(compressed));
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110 return;
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111 end
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112 session.conn:write(compressed);
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113 end;
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114
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115 if session.sends2s then session.sends2s = new_send
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116 elseif session.send then session.send = new_send end
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117 end
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118
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119 -- setup decompression for a stream
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120 local function setup_decompression(session, inflate_stream)
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121 local old_data = session.data
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122 session.data = function(conn, data)
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123 local status, decompressed, eof = pcall(inflate_stream, data);
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124 if status == false then
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125 session:close({
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126 condition = "undefined-condition";
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127 text = decompressed;
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128 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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129 });
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130 module:log("warn", "%s", tostring(decompressed));
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131 return;
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132 end
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133 old_data(conn, decompressed);
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134 end;
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135 end
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136
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137 module:add_handler({"s2sout_unauthed", "s2sout"}, "compressed", xmlns_compression_protocol,
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138 function(session ,stanza)
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139 session.log("debug", "Activating compression...")
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140 -- create deflate and inflate streams
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141 local deflate_stream = get_deflate_stream(session);
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142 if not deflate_stream then return end
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143
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144 local inflate_stream = get_inflate_stream(session);
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145 if not inflate_stream then return end
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146
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147 -- setup compression for session.w
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148 setup_compression(session, deflate_stream);
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149
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150 -- setup decompression for session.data
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151 setup_decompression(session, inflate_stream);
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152 local session_reset_stream = session.reset_stream;
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153 session.reset_stream = function(session)
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154 session_reset_stream(session);
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155 setup_decompression(session, inflate_stream);
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156 return true;
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157 end;
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158 session:reset_stream();
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159 local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams",
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160 ["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host};
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161 session.sends2s("<?xml version='1.0'?>");
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162 session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
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163 session.compressed = true;
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164 end
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165 );
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166
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167 module:add_handler({"c2s_unauthed", "c2s", "s2sin_unauthed", "s2sin"}, "compress", xmlns_compression_protocol,
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168 function(session, stanza)
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169 -- fail if we are already compressed
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170 if session.compressed then
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171 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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172 (session.sends2s or session.send)(error_st);
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173 session.log("debug", "Client tried to establish another compression layer.");
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174 return;
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175 end
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176
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177 -- checking if the compression method is supported
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178 local method = stanza:child_with_name("method");
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179 method = method and (method[1] or "");
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180 if method == "zlib" then
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181 session.log("debug", "zlib compression enabled.");
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182
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183 -- create deflate and inflate streams
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184 local deflate_stream = get_deflate_stream(session);
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185 if not deflate_stream then return end
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186
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187 local inflate_stream = get_inflate_stream(session);
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188 if not inflate_stream then return end
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189
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190 (session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
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191 session:reset_stream();
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192
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193 -- setup compression for session.w
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194 setup_compression(session, deflate_stream);
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195
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196 -- setup decompression for session.data
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197 setup_decompression(session, inflate_stream);
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198
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199 local session_reset_stream = session.reset_stream;
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200 session.reset_stream = function(session)
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201 session_reset_stream(session);
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202 setup_decompression(session, inflate_stream);
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203 return true;
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204 end;
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205 session.compressed = true;
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206 elseif method then
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207 session.log("debug", "%s compression selected, but we don't support it.", tostring(method));
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208 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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209 (session.sends2s or session.send)(error_st);
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210 else
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211 (session.sends2s or session.send)(st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"));
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212 end
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213 end
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214 );
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215