prosody
6b776f80b96e
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 10782:6b776f80b96e

mod_carbons: Carbon anything that has been archived by the current user This ensures rules in mod_mam apply to some extent. Messages worth archiving are probably worth sending to other clients.
author Kim Alvefur <zash@zash.se>
date Sun, 26 Apr 2020 20:24:51 +0200
parent 10781:f7e8d299513f
child 10785:e210afc9296a
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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2be85cb3bc66 mod_carbons: Make the conditions for ignoring MUC PMs more specific (fixes #744)
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2 -- Copyright (C) 2011-2016 Kim Alvefur
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3 --
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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_forward = "urn:xmpp:forward:0";
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10 local full_sessions, bare_sessions = prosody.full_sessions, prosody.bare_sessions;
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11
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12 local function toggle_carbons(event)
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13 local origin, stanza = event.origin, event.stanza;
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14 local state = stanza.tags[1].name;
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15 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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16 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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17 origin.send(st.reply(stanza));
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18 return true;
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19 end
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20 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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21 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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22
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23 local function should_copy(stanza, c2s, user_bare)
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24 local st_type = stanza.attr.type or "normal";
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25 if stanza:get_child("private", xmlns_carbons) then
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26 return false, "private";
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27 end
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28
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29 if stanza:get_child("no-copy", "urn:xmpp:hints") then
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30 return false, "hint";
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31 end
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32
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33 if not c2s and stanza.attr.to ~= user_bare and stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
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34 -- MUC PMs are normally sent to full JIDs
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35 return false, "muc-pm";
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36 end
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37
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38 if st_type == "chat" then
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39 return true, "type";
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40 end
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41
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42 if st_type == "normal" and stanza:get_child("body") then
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43 return true, "type";
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44 end
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45
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46 if st_type == "error" and not c2s and not (stanza.attr.from or ""):find("/") then
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47 return true, "bounce";
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48 end
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49
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50 for archived in stanza:childtags("stanza-id", "urn:xmpp:sid:0") do
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51 if archived and archived.attr.by == user_bare then
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52 return true, "archived";
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53 end
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54 end
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55
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56 return false, "default";
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57 end
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58
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59 local function message_handler(event, c2s)
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60 local origin, stanza = event.origin, event.stanza;
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61 local orig_type = stanza.attr.type or "normal";
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62 local orig_from = stanza.attr.from;
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63 local bare_from = jid_bare(orig_from);
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64 local orig_to = stanza.attr.to;
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65 local bare_to = jid_bare(orig_to);
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66
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67 -- Stanza sent by a local client
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68 local bare_jid = bare_from; -- JID of the local user
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69 local target_session = origin;
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70 local top_priority = false;
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71 local user_sessions = bare_sessions[bare_from];
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72
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73 -- Stanza about to be delivered to a local client
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74 if not c2s then
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75 bare_jid = bare_to;
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76 target_session = full_sessions[orig_to];
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77 user_sessions = bare_sessions[bare_jid];
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78 if not target_session and user_sessions then
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79 -- The top resources will already receive this message per normal routing rules,
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80 -- so we are going to skip them in order to avoid sending duplicated messages.
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81 local top_resources = user_sessions.top_resources;
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82 top_priority = top_resources and top_resources[1].priority
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83 end
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84 end
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85
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86 if not user_sessions then
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87 module:log("debug", "Skip carbons for offline user");
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88 return -- No use in sending carbons to an offline user
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89 end
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90
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91 local should, why = should_copy(stanza, c2s, bare_jid);
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92
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93 if not should then
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94 module:log("debug", "Not copying stanza: %s (%s)", stanza:top_tag(), why);
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95 elseif why == "private" and not c2s then
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96 stanza:maptags(function(tag)
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97 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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98 return tag;
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99 end
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100 end);
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101 end
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102
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103 local carbon;
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104 user_sessions = user_sessions and user_sessions.sessions;
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105 for _, session in pairs(user_sessions) do
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106 -- Carbons are sent to resources that have enabled it
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107 if session.want_carbons
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108 -- but not the resource that sent the message, or the one that it's directed to
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109 and session ~= target_session
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110 -- and isn't among the top resources that would receive the message per standard routing rules
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111 and (c2s or session.priority ~= top_priority) then
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112 if not carbon then
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113 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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114 local copy = st.clone(stanza);
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115 if c2s and not orig_to then
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116 stanza.attr.to = bare_from;
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117 end
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118 copy.attr.xmlns = "jabber:client";
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119 carbon = st.message{ from = bare_jid, type = orig_type, }
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120 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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121 :tag("forwarded", { xmlns = xmlns_forward })
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122 :add_child(copy):reset();
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123
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124 end
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125
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126 carbon.attr.to = session.full_jid;
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127 module:log("debug", "Sending carbon to %s", session.full_jid);
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128 session.send(carbon);
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129 end
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130 end
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131 end
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132
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133 local function c2s_message_handler(event)
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134 return message_handler(event, true)
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135 end
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136
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137 -- Stanzas sent by local clients
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138 module:hook("pre-message/host", c2s_message_handler, -0.5);
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139 module:hook("pre-message/bare", c2s_message_handler, -0.5);
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140 module:hook("pre-message/full", c2s_message_handler, -0.5);
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141 -- Stanzas to local clients
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142 module:hook("message/bare", message_handler, -0.5);
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143 module:hook("message/full", message_handler, -0.5);
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144
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145 module:add_feature(xmlns_carbons);