annotate mod_carbons/mod_carbons.lua @ 3772:22f02716819f

mod_s2s_keepalive: Isolate source host of pings The incoming_s2s table is not restricted to the current virtualhost so this prevents opening more connections than what's needed. Also prevents useless double sending of one whitespace per local host.
author Kim Alvefur <zash@zash.se>
date Mon, 23 Dec 2019 01:18:02 +0100
parents 704e4845267b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- XEP-0280: Message Carbons implementation for Prosody
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2 -- Copyright (C) 2011-2016 Kim Alvefur
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3 --
6d0d2673f95e mod_carbons: Add MIT license statement.
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4 -- This file is MIT/X11 licensed.
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5
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6 local st = require "util.stanza";
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7 local jid_bare = require "util.jid".bare;
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8 local xmlns_carbons = "urn:xmpp:carbons:2";
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9 local xmlns_carbons_old = "urn:xmpp:carbons:1";
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10 local xmlns_carbons_really_old = "urn:xmpp:carbons:0";
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11 local xmlns_forward = "urn:xmpp:forward:0";
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12 local full_sessions, bare_sessions = prosody.full_sessions, prosody.bare_sessions;
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13
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14 local function toggle_carbons(event)
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15 local origin, stanza = event.origin, event.stanza;
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16 local state = stanza.tags[1].attr.mode or stanza.tags[1].name;
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17 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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18 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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19 origin.send(st.reply(stanza));
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20 return true;
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21 end
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22 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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23 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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24
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25 -- COMPAT
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26 module:hook("iq-set/self/"..xmlns_carbons_old..":disable", toggle_carbons);
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27 module:hook("iq-set/self/"..xmlns_carbons_old..":enable", toggle_carbons);
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28 module:hook("iq-set/self/"..xmlns_carbons_really_old..":carbons", toggle_carbons);
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29
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30 local function message_handler(event, c2s)
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31 local origin, stanza = event.origin, event.stanza;
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32 local orig_type = stanza.attr.type or "normal";
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33 local orig_from = stanza.attr.from;
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34 local orig_to = stanza.attr.to;
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35
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36 if not(orig_type == "chat" or (orig_type == "normal" and stanza:get_child("body"))) then
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37 return -- Only chat type messages
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38 end
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39
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40 -- Stanza sent by a local client
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41 local bare_jid = jid_bare(orig_from);
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42 local target_session = origin;
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43 local top_priority = false;
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44 local user_sessions = bare_sessions[bare_jid];
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45
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46 -- Stanza about to be delivered to a local client
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47 if not c2s then
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48 bare_jid = jid_bare(orig_to);
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49 target_session = full_sessions[orig_to];
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50 user_sessions = bare_sessions[bare_jid];
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51 if not target_session and user_sessions then
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52 -- The top resources will already receive this message per normal routing rules,
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53 -- so we are going to skip them in order to avoid sending duplicated messages.
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54 local top_resources = user_sessions.top_resources;
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55 top_priority = top_resources and top_resources[1].priority
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56 end
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57 end
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58
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59 if not user_sessions then
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60 module:log("debug", "Skip carbons for offline user");
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61 return -- No use in sending carbons to an offline user
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62 end
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63
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64 if stanza:get_child("private", xmlns_carbons) then
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65 if not c2s then
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66 stanza:maptags(function(tag)
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67 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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68 return tag;
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69 end
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70 end);
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71 end
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72 module:log("debug", "Message tagged private, ignoring");
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73 return
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74 elseif stanza:get_child("no-copy", "urn:xmpp:hints") then
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75 module:log("debug", "Message has no-copy hint, ignoring");
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76 return
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77 elseif not c2s and bare_jid == orig_from and stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
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78 module:log("debug", "MUC PM, ignoring");
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79 return
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80 end
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81
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82 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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83 local copy = st.clone(stanza);
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84 copy.attr.xmlns = "jabber:client";
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85 local carbon = st.message{ from = bare_jid, type = orig_type, }
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d24d87ca3f5f mod_carbons: <forwarded/> should be nested in <sent/>/<received/>
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86 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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87 :tag("forwarded", { xmlns = xmlns_forward })
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88 :add_child(copy):reset();
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89
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90 -- COMPAT
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91 local carbon_old = st.message{ from = bare_jid, type = orig_type, }
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92 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons_old }):up()
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93 :tag("forwarded", { xmlns = xmlns_forward })
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94 :add_child(copy):reset();
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95
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96 -- COMPAT
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97 local carbon_really_old = st.clone(stanza)
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98 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons_really_old }):up()
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99
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100 user_sessions = user_sessions and user_sessions.sessions;
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101 for _, session in pairs(user_sessions) do
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102 -- Carbons are sent to resources that have enabled it
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103 if session.want_carbons
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104 -- but not the resource that sent the message, or the one that it's directed to
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105 and session ~= target_session
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106 -- and isn't among the top resources that would receive the message per standard routing rules
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107 and (c2s or session.priority ~= top_priority)
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108 -- don't send v0 carbons (or copies) for c2s
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109 and (not c2s or session.want_carbons ~= xmlns_carbons_really_old) then
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110 carbon.attr.to = session.full_jid;
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111 module:log("debug", "Sending carbon to %s", session.full_jid);
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112 local carbon = session.want_carbons == xmlns_carbons_old and carbon_old -- COMPAT
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113 or session.want_carbons == xmlns_carbons_really_old and carbon_really_old -- COMPAT
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114 or carbon;
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115 session.send(carbon);
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116 end
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117 end
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118 end
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119
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120 local function c2s_message_handler(event)
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121 return message_handler(event, true)
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122 end
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123
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124 -- Stanzas sent by local clients
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125 module:hook("pre-message/host", c2s_message_handler, 0.05); -- priority between mod_message (0 in 0.9) and mod_firewall (0.1)
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126 module:hook("pre-message/bare", c2s_message_handler, 0.05);
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127 module:hook("pre-message/full", c2s_message_handler, 0.05);
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128 -- Stanzas to local clients
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129 module:hook("message/bare", message_handler, 0.05);
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130 module:hook("message/full", message_handler, 0.05);
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132 module:add_feature(xmlns_carbons);
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133 module:add_feature(xmlns_carbons_old);
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134 if module:get_option_boolean("carbons_v0") then
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135 module:add_feature(xmlns_carbons_really_old);
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136 end