prosody
6a97d448cb1e
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 12835:6a97d448cb1e

Merge 0.12->trunk
author Kim Alvefur <zash@zash.se>
date Tue, 10 Jan 2023 21:14:07 +0100
parent 12308:063ce658c181
child 12977:74b9e05af71e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
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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 jid_resource = require "util.jid".resource;
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9 local xmlns_carbons = "urn:xmpp:carbons:2";
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10 local xmlns_forward = "urn:xmpp:forward:0";
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11 local full_sessions, bare_sessions = prosody.full_sessions, prosody.bare_sessions;
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12
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13 module:add_feature("urn:xmpp:carbons:rules:0");
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14
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15 local function is_bare(jid)
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16 return not jid_resource(jid);
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17 end
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18
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19 local function toggle_carbons(event)
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20 local origin, stanza = event.origin, event.stanza;
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21 local state = stanza.tags[1].name;
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22 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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23 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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24 origin.send(st.reply(stanza));
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25 return true;
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26 end
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27 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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28 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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29
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30 local function should_copy(stanza, c2s, user_bare) --> boolean, reason: string
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31 local st_type = stanza.attr.type or "normal";
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32 if stanza:get_child("private", xmlns_carbons) then
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33 return false, "private";
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34 end
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35
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36 if stanza:get_child("no-copy", "urn:xmpp:hints") then
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37 return false, "hint";
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38 end
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39
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40 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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41 -- MUC PMs are normally sent to full JIDs
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42 return false, "muc-pm";
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43 end
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44
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45 if st_type == "chat" then
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46 return true, "type";
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47 end
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48
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49 if st_type == "normal" and stanza:get_child("body") then
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50 return true, "type";
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51 end
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52
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53 -- Normal outgoing chat messages are sent to=bare JID. This clause should
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54 -- match the error bounces from those, which would have from=bare JID and
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55 -- be incoming (not c2s).
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56 if st_type == "error" and not c2s and is_bare(stanza.attr.from) then
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57 return true, "bounce";
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58 end
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59
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60 if stanza:get_child(nil, "urn:xmpp:jingle-message:0") or stanza:get_child(nil, "urn:xmpp:jingle-message:1") then
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61 -- XXX Experimental XEP
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62 return true, "jingle call";
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63 end
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64
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65 if stanza:get_child_with_attr("stanza-id", "urn:xmpp:sid:0", "by", user_bare) then
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66 return true, "archived";
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67 end
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68
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69 return false, "default";
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70 end
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71
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72 module:hook("carbons-should-copy", function (event)
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73 local should, why = should_copy(event.stanza);
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74 event.reason = why;
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75 return should;
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76 end, -1)
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77
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78 local function message_handler(event, c2s)
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79 local origin, stanza = event.origin, event.stanza;
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80 local orig_type = stanza.attr.type or "normal";
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81 local orig_from = stanza.attr.from;
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82 local bare_from = jid_bare(orig_from);
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83 local orig_to = stanza.attr.to;
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84 local bare_to = jid_bare(orig_to);
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85
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86 -- Stanza sent by a local client
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87 local bare_jid = bare_from; -- JID of the local user
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88 local target_session = origin;
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89 local top_priority = false;
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90 local user_sessions = bare_sessions[bare_from];
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91
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92 -- Stanza about to be delivered to a local client
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93 if not c2s then
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94 bare_jid = bare_to;
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95 target_session = full_sessions[orig_to];
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96 user_sessions = bare_sessions[bare_jid];
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97 if not target_session and user_sessions then
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98 -- The top resources will already receive this message per normal routing rules,
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99 -- so we are going to skip them in order to avoid sending duplicated messages.
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100 local top_resources = user_sessions.top_resources;
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101 top_priority = top_resources and top_resources[1].priority
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102 end
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103 end
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104
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105 if not user_sessions then
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106 module:log("debug", "Skip carbons for offline user");
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107 return -- No use in sending carbons to an offline user
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108 end
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109
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110 local event_payload = { stanza = stanza; session = origin };
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111 local should = module:fire_event("carbons-should-copy", event_payload);
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112 local why = event_payload.reason;
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113
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114 if not should then
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115 module:log("debug", "Not copying stanza: %s (%s)", stanza:top_tag(), why);
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116 if why == "private" and not c2s then
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117 stanza:maptags(function(tag)
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118 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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119 return tag;
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120 end
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121 end);
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122 end
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123 return;
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124 end
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125
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126 local carbon;
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127 user_sessions = user_sessions and user_sessions.sessions;
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128 for _, session in pairs(user_sessions) do
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129 -- Carbons are sent to resources that have enabled it
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130 if session.want_carbons
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131 -- but not the resource that sent the message, or the one that it's directed to
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132 and session ~= target_session
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133 -- and isn't among the top resources that would receive the message per standard routing rules
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134 and (c2s or session.priority ~= top_priority) then
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135 if not carbon then
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136 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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137 local copy = st.clone(stanza);
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138 if c2s and not orig_to then
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139 stanza.attr.to = bare_from;
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140 end
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141 copy.attr.xmlns = "jabber:client";
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142 carbon = st.message{ from = bare_jid, type = orig_type, }
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143 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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144 :tag("forwarded", { xmlns = xmlns_forward })
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145 :add_child(copy):reset();
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146
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147 end
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148
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149 carbon.attr.to = session.full_jid;
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150 module:log("debug", "Sending carbon to %s", session.full_jid);
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151 session.send(carbon);
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152 end
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153 end
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154 end
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155
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156 local function c2s_message_handler(event)
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157 return message_handler(event, true)
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158 end
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159
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160 -- Stanzas sent by local clients
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161 module:hook("pre-message/host", c2s_message_handler, -0.5);
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162 module:hook("pre-message/bare", c2s_message_handler, -0.5);
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163 module:hook("pre-message/full", c2s_message_handler, -0.5);
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164 -- Stanzas to local clients
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165 module:hook("message/bare", message_handler, -0.5);
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166 module:hook("message/full", message_handler, -0.5);
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167
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168 module:add_feature(xmlns_carbons);