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annotate mod_compression_unsafe/mod_compression_unsafe.lua @ 2994:9842979f3034

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mod_query_client_ver: Add a README
author Kim Alvefur <zash@zash.se>
date Wed, 04 Apr 2018 16:43:35 +0200
parents 226693a22fc9
children
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Kim Alvefur <zash@zash.se>
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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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226693a22fc9 mod_compression_unsafe: Fix logic bug in previous commit
Matthew Wild <mwild1@gmail.com>
parents: 2794
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29 if not origin.compressed and (origin.type == "c2s" or origin.type == "c2s_unbound") then
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30 features:add_child(compression_stream_feature);
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31 end
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32 end);
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33
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34 module:hook("s2s-stream-features", function(event)
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35 local origin, features = event.origin, event.features;
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36 if not origin.compressed and origin.type == "s2sin" then
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37 features:add_child(compression_stream_feature);
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38 end
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39 end);
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40
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41 -- Hook to activate compression if remote server supports it.
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42 module:hook_stanza(xmlns_stream, "features",
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43 function (session, stanza)
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44 if not session.compressed and session.type == "s2sout" then
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45 -- does remote server support compression?
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46 local comp_st = stanza:get_child("compression", xmlns_compression_feature);
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47 if comp_st then
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48 -- do we support the mechanism
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49 for a in comp_st:childtags("method") do
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50 local algorithm = a:get_text();
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51 if algorithm == "zlib" then
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52 session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
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53 session.log("debug", "Enabled compression using zlib.")
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54 return true;
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55 end
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56 end
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57 session.log("debug", "Remote server supports no compression algorithm we support.")
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58 end
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59 end
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60 end
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61 , 250);
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62
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63
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64 -- returns either nil or a fully functional ready to use inflate stream
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65 local function get_deflate_stream(session)
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66 local status, deflate_stream = pcall(zlib.deflate, compression_level);
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67 if status == false then
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68 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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69 (session.sends2s or session.send)(error_st);
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70 session.log("error", "Failed to create zlib.deflate filter.");
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71 module:log("error", "%s", tostring(deflate_stream));
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72 return
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73 end
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74 return deflate_stream
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75 end
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76
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77 -- returns either nil or a fully functional ready to use inflate stream
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78 local function get_inflate_stream(session)
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79 local status, inflate_stream = pcall(zlib.inflate);
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80 if status == false then
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81 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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82 (session.sends2s or session.send)(error_st);
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83 session.log("error", "Failed to create zlib.inflate filter.");
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84 module:log("error", "%s", tostring(inflate_stream));
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85 return
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86 end
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87 return inflate_stream
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88 end
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89
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90 -- setup compression for a stream
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91 local function setup_compression(session, deflate_stream)
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92 add_filter(session, "bytes/out", function(t)
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93 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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94 if status == false then
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95 module:log("warn", "%s", tostring(compressed));
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96 session:close({
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97 condition = "undefined-condition";
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98 text = compressed;
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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 return;
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102 end
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103 return compressed;
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104 end);
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105 end
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106
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107 -- setup decompression for a stream
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108 local function setup_decompression(session, inflate_stream)
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109 add_filter(session, "bytes/in", function(data)
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110 local status, decompressed, eof = pcall(inflate_stream, data);
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111 if status == false then
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112 module:log("warn", "%s", tostring(decompressed));
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113 session:close({
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114 condition = "undefined-condition";
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115 text = decompressed;
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116 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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117 });
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118 return;
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119 end
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120 return decompressed;
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121 end);
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122 end
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123
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124 module:hook("stanza/http://jabber.org/protocol/compress:compressed", function(event)
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125 local session = event.origin;
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126
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127 if session.type == "s2sout" then
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128 session.log("debug", "Activating compression...")
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129 -- create deflate and inflate streams
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130 local deflate_stream = get_deflate_stream(session);
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131 if not deflate_stream then return true; end
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132
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133 local inflate_stream = get_inflate_stream(session);
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134 if not inflate_stream then return true; end
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135
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136 -- setup compression for session.w
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137 setup_compression(session, deflate_stream);
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138
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139 -- setup decompression for session.data
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140 setup_decompression(session, inflate_stream);
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141 session:reset_stream();
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142 session:open_stream(session.from_host, session.to_host);
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143 session.compressed = true;
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144 return true;
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145 end
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146 end);
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147
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148 module:hook("stanza/http://jabber.org/protocol/compress:failure", function(event)
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149 local err = event.stanza:get_child();
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150 (event.origin.log or module._log)("warn", "Compression setup failed (%s)", err and err.name or "unknown reason");
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151 return true;
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152 end);
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153
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154 module:hook("stanza/http://jabber.org/protocol/compress:compress", function(event)
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155 local session, stanza = event.origin, event.stanza;
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156
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157 if session.type == "c2s" or session.type == "s2sin" then
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158 -- fail if we are already compressed
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159 if session.compressed then
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160 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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161 (session.sends2s or session.send)(error_st);
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162 session.log("debug", "Client tried to establish another compression layer.");
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163 return true;
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164 end
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165
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166 -- checking if the compression method is supported
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167 local method = stanza:get_child_text("method");
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168 if method == "zlib" then
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169 session.log("debug", "zlib compression enabled.");
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170
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171 -- create deflate and inflate streams
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172 local deflate_stream = get_deflate_stream(session);
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173 if not deflate_stream then return true; end
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174
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175 local inflate_stream = get_inflate_stream(session);
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176 if not inflate_stream then return true; end
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177
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178 (session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
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179 session:reset_stream();
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180
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181 -- setup compression for session.w
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182 setup_compression(session, deflate_stream);
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183
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184 -- setup decompression for session.data
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185 setup_decompression(session, inflate_stream);
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186
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187 session.compressed = true;
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188 elseif method then
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189 session.log("debug", "%s compression selected, but we don't support it.", tostring(method));
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190 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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191 (session.sends2s or session.send)(error_st);
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192 else
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193 (session.sends2s or session.send)(st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"));
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194 end
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195 return true;
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196 end
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197 end);
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198