prosody
a3d7b8f4d9c7
plugins/mod_compression.lua

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plugins/mod_compression.lua @ 6057:a3d7b8f4d9c7

mod_compression: Use get_child() and get_child_text()
author Kim Alvefur <zash@zash.se>
date Thu, 03 Apr 2014 23:40:20 +0200
parent 6056:29cbbe882441
child 6058:1607b03356ed
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) 2009-2012 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_number("compression_level", 7);
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20
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21 if not compression_level or compression_level < 1 or compression_level > 9 then
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22 module:log("warn", "Invalid compression level in config: %s", tostring(compression_level));
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23 module:log("warn", "Module loading aborted. Compression won't be available.");
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24 return;
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25 end
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26
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27 module:hook("stream-features", function(event)
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28 local origin, features = event.origin, event.features;
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29 if not origin.compressed and origin.type == "c2s" then
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30 -- FIXME only advertise compression support when TLS layer has no compression enabled
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31 features:add_child(compression_stream_feature);
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32 end
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33 end);
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34
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35 module:hook("s2s-stream-features", function(event)
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36 local origin, features = event.origin, event.features;
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37 -- FIXME only advertise compression support when TLS layer has no compression enabled
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38 if not origin.compressed and origin.type == "s2sin" then
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39 features:add_child(compression_stream_feature);
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40 end
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41 end);
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42
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43 -- Hook to activate compression if remote server supports it.
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44 module:hook_stanza(xmlns_stream, "features",
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45 function (session, stanza)
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46 if not session.compressed and session.type == "s2sout" then
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47 -- does remote server support compression?
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48 local comp_st = stanza:get_child("compression", xmlns_compression_feature);
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49 if comp_st then
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50 -- do we support the mechanism
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51 for a in comp_st:children() do
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52 local algorithm = a[1]
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53 if algorithm == "zlib" then
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54 session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
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55 session.log("debug", "Enabled compression using zlib.")
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56 return true;
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57 end
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58 end
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59 session.log("debug", "Remote server supports no compression algorithm we support.")
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60 end
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61 end
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62 end
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63 , 250);
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64
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65
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66 -- returns either nil or a fully functional ready to use inflate stream
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67 local function get_deflate_stream(session)
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68 local status, deflate_stream = pcall(zlib.deflate, compression_level);
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69 if status == false then
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70 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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71 (session.sends2s or session.send)(error_st);
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72 session.log("error", "Failed to create zlib.deflate filter.");
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73 module:log("error", "%s", tostring(deflate_stream));
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74 return
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75 end
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76 return deflate_stream
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77 end
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78
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79 -- returns either nil or a fully functional ready to use inflate stream
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80 local function get_inflate_stream(session)
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81 local status, inflate_stream = pcall(zlib.inflate);
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82 if status == false then
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83 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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84 (session.sends2s or session.send)(error_st);
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85 session.log("error", "Failed to create zlib.inflate filter.");
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86 module:log("error", "%s", tostring(inflate_stream));
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87 return
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88 end
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89 return inflate_stream
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90 end
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91
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92 -- setup compression for a stream
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93 local function setup_compression(session, deflate_stream)
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94 add_filter(session, "bytes/out", function(t)
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95 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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96 if status == false then
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97 module:log("warn", "%s", tostring(compressed));
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98 session:close({
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99 condition = "undefined-condition";
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100 text = compressed;
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101 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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102 });
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103 return;
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104 end
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105 return compressed;
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106 end);
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107 end
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108
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109 -- setup decompression for a stream
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110 local function setup_decompression(session, inflate_stream)
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111 add_filter(session, "bytes/in", function(data)
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112 local status, decompressed, eof = pcall(inflate_stream, data);
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113 if status == false then
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114 module:log("warn", "%s", tostring(decompressed));
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115 session:close({
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116 condition = "undefined-condition";
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117 text = decompressed;
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118 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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119 });
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120 return;
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121 end
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122 return decompressed;
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123 end);
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124 end
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125
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126 module:hook("stanza/http://jabber.org/protocol/compress:compressed", function(event)
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127 local session = event.origin;
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128
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129 if session.type == "s2sout" then
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130 session.log("debug", "Activating compression...")
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131 -- create deflate and inflate streams
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132 local deflate_stream = get_deflate_stream(session);
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133 if not deflate_stream then return true; end
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134
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135 local inflate_stream = get_inflate_stream(session);
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136 if not inflate_stream then return true; end
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137
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138 -- setup compression for session.w
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139 setup_compression(session, deflate_stream);
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140
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141 -- setup decompression for session.data
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142 setup_decompression(session, inflate_stream);
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143 session:reset_stream();
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144 session:open_stream(session.from_host, session.to_host);
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145 session.compressed = true;
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146 return true;
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147 end
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148 end);
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149
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150 module:hook("stanza/http://jabber.org/protocol/compress:compress", function(event)
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151 local session, stanza = event.origin, event.stanza;
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152
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153 if session.type == "c2s" or session.type == "s2sin" then
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154 -- fail if we are already compressed
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155 if session.compressed then
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156 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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157 (session.sends2s or session.send)(error_st);
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158 session.log("debug", "Client tried to establish another compression layer.");
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159 return true;
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160 end
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161
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162 -- checking if the compression method is supported
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163 local method = stanza:get_child_text("method");
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164 if method == "zlib" then
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165 session.log("debug", "zlib compression enabled.");
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166
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167 -- create deflate and inflate streams
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168 local deflate_stream = get_deflate_stream(session);
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169 if not deflate_stream then return true; end
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170
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171 local inflate_stream = get_inflate_stream(session);
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172 if not inflate_stream then return true; end
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173
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174 (session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
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175 session:reset_stream();
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176
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177 -- setup compression for session.w
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178 setup_compression(session, deflate_stream);
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179
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180 -- setup decompression for session.data
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181 setup_decompression(session, inflate_stream);
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182
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183 session.compressed = true;
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184 elseif method then
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185 session.log("debug", "%s compression selected, but we don't support it.", tostring(method));
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186 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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187 (session.sends2s or session.send)(error_st);
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188 else
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189 (session.sends2s or session.send)(st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"));
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190 end
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191 return true;
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192 end
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193 end);
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parents:
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194