prosody-modules
148865199003
mod_bidi/mod_bidi.lua

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mod_bidi/mod_bidi.lua @ 892:148865199003

mod_bidi: Initial commit of XEP-0288 implementation
author Kim Alvefur <zash@zash.se>
date Fri, 11 Jan 2013 01:08:31 +0100
child 893:602e4c509095
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892
148865199003 mod_bidi: Initial commit of XEP-0288 implementation
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1 -- Bidirectional Server-to-Server Connections
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2 -- http://xmpp.org/extensions/xep-0288.html
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3 -- Copyright (C) 2013 Kim Alvefur
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4 --
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5 -- This file is MIT/X11 licensed.
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6 --
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7 local s2smanager = require"core.s2smanager";
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8 local add_filter = require "util.filters".add_filter;
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9 local st = require "util.stanza";
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10 local jid_split = require"util.jid".prepped_split;
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11
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12 local xmlns_bidi_feature = "urn:xmpp:features:bidi"
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13 local xmlns_bidi = "urn:xmpp:bidi";
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14 local noop = function () end
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15 local core_process_stanza = prosody.core_process_stanza;
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16
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17 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), traceback()); end
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18 local function handlestanza(session, stanza)
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19 if stanza.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
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20 stanza.attr.xmlns = nil;
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21 end
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22 -- stanza = session.filter("stanzas/in", stanza);
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23 if stanza then
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24 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
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25 end
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26 end
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27
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28 local function new_bidi(origin)
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29 local bidi_session, remote_host;
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30 origin.log("debug", "Creating bidirectional session wrapper");
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31 if origin.direction == "incoming" then
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32 remote_host = origin.from_host;
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33 bidi_session = s2smanager.new_outgoing(origin.to_host, origin.from_host)
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34 else -- outgoing
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35 remote_host = origin.to_host;
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36 bidi_session = s2smanager.new_incoming(origin.conn)
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37 bidi_session.to_host = origin.from_host;
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38 bidi_session.from_host = origin.to_host;
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39 add_filter(origin, "stanzas/in", function(stanza)
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40 if stanza.attr.xmlns ~= nil then return stanza end
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41 local _, host = jid_split(stanza.attr.from);
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42 if host ~= remote_host then return stanza end
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43 handlestanza(bidi_session, stanza);
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44 end, 1);
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45 end
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46 origin.bidi_session = bidi_session;
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47 bidi_session.sends2s = origin.sends2s;
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48 bidi_session.bounce_sendq = noop;
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49 bidi_session.notopen = nil;
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50 bidi_session.is_bidi = true;
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51 bidi_session.bidi_session = false;
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52 bidi_session.orig_session = origin;
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53 bidi_session.secure = origin.secure;
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54 bidi_session.cert_identity_status = origin.cert_identity_status;
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55 bidi_session.cert_chain_status = origin.cert_chain_status;
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56 bidi_session.close = function(...)
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57 return origin.close(...);
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58 end
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59
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60 bidi_session.log("info", "Bidirectional session established");
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61 s2smanager.make_authenticated(bidi_session, remote_host);
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62 return bidi_session;
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63 end
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64
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65 -- Incoming s2s
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66 module:hook("s2s-stream-features", function(event)
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67 local origin, features = event.origin, event.features;
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68 if not origin.is_bidi and not hosts[module.host].s2sout[origin.from_host] then
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69 module:log("debug", "Announcing support for bidirectional streams");
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70 features:tag("bidi", { xmlns = xmlns_bidi_feature }):up();
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71 end
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72 end);
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73
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74 module:hook("stanza/urn:xmpp:bidi:bidi", function(event)
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75 local origin = event.session or event.origin;
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76 if not origin.is_bidi and not origin.bidi_session then
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77 module:log("debug", "%s requested bidirectional stream", origin.from_host);
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78 if hosts[module.host].s2sout[origin.from_host] then
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79 local conflicting_session = hosts[module.host].s2sout[origin.from_host]
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80 conflicting_session.log("warn", "We already have an outgoing connection to %s, closing it...", origin.from_host);
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81 conflicting_session:close{ condition = "conflict", text = "Replaced by bidirectional stream" }
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82 s2smanager.destroy_session(conflicting_session);
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83 end
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84 origin.do_bidi = true;
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85 return true;
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86 end
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87 end);
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88
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89 -- Outgoing s2s
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90 module:hook("stanza/http://etherx.jabber.org/streams:features", function(event)
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91 local origin = event.session or event.origin;
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92 if not ( origin.bidi_session or origin.is_bidi or origin.do_bidi)
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93 and event.stanza:get_child("bidi", xmlns_bidi_feature) then
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94 module:log("debug", "%s supports bidirectional streams", origin.to_host);
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95 origin.sends2s(st.stanza("bidi", { xmlns = xmlns_bidi }));
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96 origin.do_bidi = true;
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97 end
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98 end, 160);
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99
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100 function enable_bidi(event)
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101 local session = event.session;
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102 if session.do_bidi and not ( session.is_bidi or session.bidi_session ) then
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103 session.do_bidi = nil;
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104 new_bidi(session);
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105 end
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106 end
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107
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108 module:hook("s2sin-established", enable_bidi);
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109 module:hook("s2sout-established", enable_bidi);
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110
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111 function disable_bidi(event)
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112 local session = event.session;
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113 if session.bidi_session then
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114 local bidi_session = session.bidi_session;
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115 session.bidi_session = nil;
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116 session.log("debug", "Tearing down bidirectional stream");
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117 s2smanager.destroy_session(bidi_session, event.reason);
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118 elseif session.orig_session then
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119 local orig_session = session.orig_session;
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120 session.orig_session = nil;
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121 orig_session.log("debug", "Tearing down bidirectional stream");
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122 s2smanager.destroy_session(orig_session, event.reason);
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123 end
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124 end
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125
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126 module:hook("s2sin-destroyed", disable_bidi);
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127 module:hook("s2sout-destroyed", disable_bidi);
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128