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annotate mod_bidi/mod_bidi.lua @ 1387:db2ff8f29472

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mod_bidi: Add option for selectively not doing bidi with some hosts
author Kim Alvefur <zash@zash.se>
date Tue, 22 Apr 2014 19:19:58 +0200
parents 1818a7f08580
children 8e7d400d4db3
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rev   line source
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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 add_filter = require "util.filters".add_filter;
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8 local st = require "util.stanza";
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9 local jid_split = require"util.jid".prepped_split;
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10 local core_process_stanza = prosody.core_process_stanza;
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11 local traceback = debug.traceback;
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12 local hosts = hosts;
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13 local xmlns_bidi_feature = "urn:xmpp:features:bidi"
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14 local xmlns_bidi = "urn:xmpp:bidi";
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15 local secure_only = module:get_option_boolean("secure_bidi_only", true);
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16 local disable_bidi_for = module:get_option_set("no_bidi_with", { });
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17 local bidi_sessions = module:shared"sessions-cache";
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18
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19 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), traceback()); end
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20 local function handlestanza(session, stanza)
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21 if stanza.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
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22 stanza.attr.xmlns = nil;
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23 end
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24 -- stanza = session.filter("stanzas/in", stanza);
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25 if stanza then
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26 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
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27 end
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28 end
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29
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30 local function new_bidi(origin)
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31 if origin.type == "s2sin" then -- then we create an "outgoing" bidirectional session
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32 local conflicting_session = hosts[origin.to_host].s2sout[origin.from_host]
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33 if conflicting_session then
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34 conflicting_session.log("info", "We already have an outgoing connection to %s, closing it...", origin.from_host);
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35 conflicting_session:close{ condition = "conflict", text = "Replaced by bidirectional stream" }
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36 end
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37 bidi_sessions[origin.from_host] = origin;
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38 origin.is_bidi = true;
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39 elseif origin.type == "s2sout" then -- handle incoming stanzas correctly
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40 local bidi_session = {
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41 type = "s2sin"; direction = "incoming";
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42 is_bidi = true; orig_session = origin;
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43 to_host = origin.from_host;
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44 from_host = origin.to_host;
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45 hosts = {};
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46 }
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47 origin.bidi_session = bidi_session;
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48 setmetatable(bidi_session, { __index = origin });
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49 module:fire_event("s2s-authenticated", { session = bidi_session, host = origin.to_host });
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50 local remote_host = origin.to_host;
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51 add_filter(origin, "stanzas/in", function(stanza)
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52 if stanza.attr.xmlns ~= nil then return stanza end
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53 local _, host = jid_split(stanza.attr.from);
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54 if host ~= remote_host then return stanza end
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55 handlestanza(bidi_session, stanza);
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56 end, 1);
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57 end
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58 end
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59
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60 module:hook("route/remote", function(event)
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61 local from_host, to_host, stanza = event.from_host, event.to_host, event.stanza;
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62 if from_host ~= module.host then return end
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63 local to_session = bidi_sessions[to_host];
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64 if not to_session or to_session.type ~= "s2sin" then return end
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65 if to_session.sends2s(stanza) then return true end
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66 end, -2);
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67
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68 -- Incoming s2s
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69 module:hook("s2s-stream-features", function(event)
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70 local origin, features = event.origin, event.features;
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71 if not origin.is_bidi and not origin.bidi_session and not origin.do_bidi
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72 and not hosts[module.host].s2sout[origin.from_host]
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73 and not disable_bidi_for:contains(origin.from_host)
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74 and (not secure_only or (origin.cert_chain_status == "valid"
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75 and origin.cert_identity_status == "valid")) then
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76 module:log("debug", "Announcing support for bidirectional streams");
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77 features:tag("bidi", { xmlns = xmlns_bidi_feature }):up();
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78 end
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79 end);
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80
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81 module:hook("stanza/urn:xmpp:bidi:bidi", function(event)
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82 local origin = event.session or event.origin;
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83 if not origin.is_bidi and not origin.bidi_session
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84 and not disable_bidi_for:contains(origin.from_host)
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85 and (not secure_only or origin.cert_chain_status == "valid"
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86 and origin.cert_identity_status == "valid") then
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87 module:log("debug", "%s requested bidirectional stream", origin.from_host);
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88 origin.do_bidi = true;
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89 return true;
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90 end
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91 end);
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92
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93 -- Outgoing s2s
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94 module:hook("stanza/http://etherx.jabber.org/streams:features", function(event)
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95 local origin = event.session or event.origin;
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96 if not ( origin.bidi_session or origin.is_bidi or origin.do_bidi)
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97 and not disable_bidi_for:contains(origin.to_host)
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98 and event.stanza:get_child("bidi", xmlns_bidi_feature)
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99 and (not secure_only or origin.cert_chain_status == "valid"
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100 and origin.cert_identity_status == "valid") then
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101 module:log("debug", "%s supports bidirectional streams", origin.to_host);
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102 origin.sends2s(st.stanza("bidi", { xmlns = xmlns_bidi }));
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103 origin.do_bidi = true;
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104 end
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105 end, 160);
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106
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107 function enable_bidi(event)
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108 local session = event.session;
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109 if session.do_bidi and not ( session.is_bidi or session.bidi_session ) then
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110 session.do_bidi = nil;
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111 new_bidi(session);
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112 end
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113 end
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114
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115 module:hook("s2sin-established", enable_bidi);
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116 module:hook("s2sout-established", enable_bidi);
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117
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118 function disable_bidi(event)
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119 local session = event.session;
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120 if session.type == "s2sin" then
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121 bidi_sessions[session.from_host] = nil;
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122 end
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123 end
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124
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125 module:hook("s2sin-destroyed", disable_bidi);
148865199003 mod_bidi: Initial commit of XEP-0288 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
126 module:hook("s2sout-destroyed", disable_bidi);
148865199003 mod_bidi: Initial commit of XEP-0288 implementation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
127