Tue, 06 Oct 2009 18:05:31 +0100
util.stanza: Make xml_escape publicly accessible
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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 | |
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12 | local xmlns_compression_feature = "http://jabber.org/features/compress" |
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13 | local xmlns_compression_protocol = "http://jabber.org/protocol/compress" |
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14 | local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up(); |
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15 | |
1676 | 16 | local compression_level = module:get_option("compression_level"); |
17 | ||
18 | -- if not defined assume admin wants best compression | |
19 | if compression_level == nil then compression_level = 9 end; | |
20 | ||
21 | compression_level = tonumber(compression_level); | |
22 | if not compression_level or compression_level < 1 or compression_level > 9 then | |
23 | module:log("warn", "Invalid compression level in config: %s", tostring(compression_level)); | |
24 | module:log("warn", "Module loading aborted. Compression won't be available."); | |
25 | return; | |
26 | end | |
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27 | |
1670 | 28 | module:add_event_hook("stream-features", |
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29 | function (session, features) |
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30 | if not session.compressed then |
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31 | -- FIXME only advertise compression support when TLS layer has no compression enabled |
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32 | features:add_child(compression_stream_feature); |
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33 | end |
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34 | end |
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35 | ); |
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36 | |
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37 | -- TODO Support compression on S2S level too. |
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38 | module:add_handler({"c2s_unauthed", "c2s"}, "compress", xmlns_compression_protocol, |
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39 | function(session, stanza) |
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40 | -- fail if we are already compressed |
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41 | if session.compressed then |
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42 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method"); |
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43 | session.send(error_st); |
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44 | session:log("warn", "Tried to establish another compression layer."); |
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45 | end |
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46 | |
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47 | -- checking if the compression method is supported |
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48 | local method = stanza:child_with_name("method")[1]; |
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49 | if method == "zlib" then |
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50 | session.log("info", method.." compression selected."); |
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51 | session.send(st.stanza("compressed", {xmlns=xmlns_compression_protocol})); |
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52 | session:reset_stream(); |
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53 | |
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54 | -- create deflate and inflate streams |
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55 | local status, deflate_stream = pcall(zlib.deflate, compression_level); |
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56 | if status == false then |
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57 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"); |
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58 | session.send(error_st); |
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59 | session:log("error", "Failed to create zlib.deflate filter."); |
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60 | module:log("error", deflate_stream); |
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61 | return |
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62 | end |
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63 | |
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64 | local status, inflate_stream = pcall(zlib.inflate); |
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65 | if status == false then |
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66 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"); |
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67 | session.send(error_st); |
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68 | session:log("error", "Failed to create zlib.deflate filter."); |
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69 | module:log("error", inflate_stream); |
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70 | return |
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71 | end |
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72 | |
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73 | -- setup compression for session.w |
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74 | local old_send = session.send; |
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75 | |
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76 | session.send = function(t) |
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77 | local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync'); |
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78 | if status == false then |
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79 | session:close({ |
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80 | condition = "undefined-condition"; |
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81 | text = compressed; |
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82 | extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed"); |
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83 | }); |
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84 | module:log("warn", compressed); |
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85 | return; |
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86 | end |
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87 | old_send(compressed); |
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88 | end; |
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89 | |
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90 | -- setup decompression for session.data |
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91 | local function setup_decompression(session) |
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92 | local old_data = session.data |
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93 | session.data = function(conn, data) |
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94 | local status, decompressed, eof = pcall(inflate_stream, data); |
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95 | if status == false then |
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96 | session:close({ |
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97 | condition = "undefined-condition"; |
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98 | text = decompressed; |
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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 | module:log("warn", decompressed); |
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102 | return; |
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103 | end |
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104 | old_data(conn, decompressed); |
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105 | end; |
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106 | end |
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107 | setup_decompression(session); |
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108 | |
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109 | local session_reset_stream = session.reset_stream; |
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110 | session.reset_stream = function(session) |
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111 | session_reset_stream(session); |
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112 | setup_decompression(session); |
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113 | return true; |
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114 | end; |
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115 | session.compressed = true; |
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116 | else |
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117 | session.log("info", method.." compression selected. But we don't support it."); |
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118 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method"); |
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119 | session.send(error_st); |
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120 | end |
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121 | end |
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122 | ); |