Mercurial > prosody-modules

annotate mod_compression_unsafe/mod_compression_unsafe.lua @ 4980:da151f9af861

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replaced 'session' with 'origin' in push_disable session is not defined in this function, trying to access it leads to an error. The correct reference seems to be 'origin'. (This may have come about by copying from the similar code in process_stanza_queue.)
author arcseconds
date Sat, 30 Jul 2022 21:07:47 +1200
parents 226693a22fc9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 -- Prosody IM
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Kim Alvefur <zash@zash.se>
parents:
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2 -- Copyright (C) 2009-2012 Tobias Markmann
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Kim Alvefur <zash@zash.se>
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3 --
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Kim Alvefur <zash@zash.se>
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4 -- This project is MIT/X11 licensed. Please see the
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Kim Alvefur <zash@zash.se>
parents:
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5 -- COPYING file in the source package for more information.
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Kim Alvefur <zash@zash.se>
parents:
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6 --
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7
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Kim Alvefur <zash@zash.se>
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8 local st = require "util.stanza";
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Kim Alvefur <zash@zash.se>
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9 local zlib = require "zlib";
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Kim Alvefur <zash@zash.se>
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10 local pcall = pcall;
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
parents:
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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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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
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43 function (session, stanza)
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Kim Alvefur <zash@zash.se>
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44 if not session.compressed and session.type == "s2sout" then
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Kim Alvefur <zash@zash.se>
parents:
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45 -- does remote server support compression?
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
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48 -- do we support the mechanism
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parents:
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49 for a in comp_st:childtags("method") do
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Kim Alvefur <zash@zash.se>
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50 local algorithm = a:get_text();
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Kim Alvefur <zash@zash.se>
parents:
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51 if algorithm == "zlib" then
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Kim Alvefur <zash@zash.se>
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52 session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
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56 end
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
parents:
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65 local function get_deflate_stream(session)
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
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68 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
parents:
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71 module:log("error", "%s", tostring(deflate_stream));
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parents:
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72 return
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Kim Alvefur <zash@zash.se>
parents:
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73 end
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Kim Alvefur <zash@zash.se>
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74 return deflate_stream
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parents:
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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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Kim Alvefur <zash@zash.se>
parents:
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78 local function get_inflate_stream(session)
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Kim Alvefur <zash@zash.se>
parents:
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79 local status, inflate_stream = pcall(zlib.inflate);
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parents:
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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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Kim Alvefur <zash@zash.se>
parents:
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82 (session.sends2s or session.send)(error_st);
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parents:
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83 session.log("error", "Failed to create zlib.inflate filter.");
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Kim Alvefur <zash@zash.se>
parents:
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84 module:log("error", "%s", tostring(inflate_stream));
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parents:
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85 return
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parents:
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86 end
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87 return inflate_stream
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parents:
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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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Kim Alvefur <zash@zash.se>
parents:
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91 local function setup_compression(session, deflate_stream)
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Kim Alvefur <zash@zash.se>
parents:
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92 add_filter(session, "bytes/out", function(t)
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Kim Alvefur <zash@zash.se>
parents:
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93 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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Kim Alvefur <zash@zash.se>
parents:
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94 if status == false then
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Kim Alvefur <zash@zash.se>
parents:
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95 module:log("warn", "%s", tostring(compressed));
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Kim Alvefur <zash@zash.se>
parents:
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96 session:close({
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Kim Alvefur <zash@zash.se>
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97 condition = "undefined-condition";
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
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100 });
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101 return;
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102 end
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Kim Alvefur <zash@zash.se>
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103 return compressed;
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Kim Alvefur <zash@zash.se>
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104 end);
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105 end
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106
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Kim Alvefur <zash@zash.se>
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107 -- setup decompression for a stream
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Kim Alvefur <zash@zash.se>
parents:
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108 local function setup_decompression(session, inflate_stream)
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Kim Alvefur <zash@zash.se>
parents:
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109 add_filter(session, "bytes/in", function(data)
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Kim Alvefur <zash@zash.se>
parents:
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110 local status, decompressed, eof = pcall(inflate_stream, data);
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Kim Alvefur <zash@zash.se>
parents:
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111 if status == false then
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Kim Alvefur <zash@zash.se>
parents:
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112 module:log("warn", "%s", tostring(decompressed));
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Kim Alvefur <zash@zash.se>
parents:
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113 session:close({
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Kim Alvefur <zash@zash.se>
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114 condition = "undefined-condition";
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
parents:
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117 });
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Kim Alvefur <zash@zash.se>
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118 return;
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Kim Alvefur <zash@zash.se>
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119 end
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Kim Alvefur <zash@zash.se>
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120 return decompressed;
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Kim Alvefur <zash@zash.se>
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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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Kim Alvefur <zash@zash.se>
parents:
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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