Annotate

plugins/mod_carbons.lua @ 12775:1dd468c63a3d

mod_blocklist: Add option 'migrate_legacy_blocking' to disable migration from mod_privacy Tiny performance improvement for new users by skipping this check. Most servers should have gone trough the migration for all active users long ago. As a suitable first step of phasing out this code, we make it possible to disable it first. Later it can be disabled by default, before finally the code is deleted.
author Kim Alvefur <zash@zash.se>
date Mon, 17 Oct 2022 15:20:06 +0200
parent 12308:063ce658c181
child 12977:74b9e05af71e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 --
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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);