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annotate mod_compression_unsafe/mod_compression_unsafe.lua @ 4974:807007913f67

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mod_log_json: Prefer native Lua table.pack over Prosody util.table one Prosody is removing support for Lua 5.1, which was the reason for util.table.pack to exist in the first place, since Lua 5.2+ provides table.pack. In prosody rev 5eaf77114fdb everything was switched over to use table.pack, opening the door for removing util.table.pack at some point. This change here is to prepare for that future eventuality.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 20:08:41 +0200
parents 226693a22fc9
children
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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" 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