prosody
d336b28b4002
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 11395:d336b28b4002

mod_http_errors: Style tweak Weird to have the background all the way to the edge of the viewport. Would be nice if this could be done without the extra span.
author Kim Alvefur <zash@zash.se>
date Sun, 21 Feb 2021 07:59:17 +0100
parent 11260:08b397c21805
child 11796:71c20650a0b4
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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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 local function is_bare(jid)
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14 return not jid_resource(jid);
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15 end
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16
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17 local function toggle_carbons(event)
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18 local origin, stanza = event.origin, event.stanza;
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19 local state = stanza.tags[1].name;
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20 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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21 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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22 origin.send(st.reply(stanza));
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23 return true;
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24 end
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25 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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26 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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27
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28 local function should_copy(stanza, c2s, user_bare) --> boolean, reason: string
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29 local st_type = stanza.attr.type or "normal";
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30 if stanza:get_child("private", xmlns_carbons) then
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31 return false, "private";
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32 end
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33
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34 if stanza:get_child("no-copy", "urn:xmpp:hints") then
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35 return false, "hint";
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36 end
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37
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38 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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39 -- MUC PMs are normally sent to full JIDs
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40 return false, "muc-pm";
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41 end
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42
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43 if st_type == "chat" then
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44 return true, "type";
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45 end
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46
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47 if st_type == "normal" and stanza:get_child("body") then
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48 return true, "type";
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49 end
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50
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51 -- Normal outgoing chat messages are sent to=bare JID. This clause should
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52 -- match the error bounces from those, which would have from=bare JID and
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53 -- be incoming (not c2s).
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54 if st_type == "error" and not c2s and is_bare(stanza.attr.from) then
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55 return true, "bounce";
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56 end
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57
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58 if stanza:get_child(nil, "urn:xmpp:jingle-message:0") then
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59 -- XXX Experimental XEP
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60 return true, "jingle call";
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61 end
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62
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63 for archived in stanza:childtags("stanza-id", "urn:xmpp:sid:0") do
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64 if archived and archived.attr.by == user_bare then
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65 return true, "archived";
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66 end
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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 local function message_handler(event, c2s)
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73 local origin, stanza = event.origin, event.stanza;
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74 local orig_type = stanza.attr.type or "normal";
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75 local orig_from = stanza.attr.from;
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76 local bare_from = jid_bare(orig_from);
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77 local orig_to = stanza.attr.to;
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78 local bare_to = jid_bare(orig_to);
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79
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80 -- Stanza sent by a local client
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81 local bare_jid = bare_from; -- JID of the local user
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82 local target_session = origin;
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83 local top_priority = false;
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84 local user_sessions = bare_sessions[bare_from];
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85
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86 -- Stanza about to be delivered to a local client
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87 if not c2s then
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88 bare_jid = bare_to;
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89 target_session = full_sessions[orig_to];
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90 user_sessions = bare_sessions[bare_jid];
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91 if not target_session and user_sessions then
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92 -- The top resources will already receive this message per normal routing rules,
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93 -- so we are going to skip them in order to avoid sending duplicated messages.
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94 local top_resources = user_sessions.top_resources;
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95 top_priority = top_resources and top_resources[1].priority
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96 end
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97 end
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98
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99 if not user_sessions then
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100 module:log("debug", "Skip carbons for offline user");
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101 return -- No use in sending carbons to an offline user
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102 end
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103
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104 local should, why = should_copy(stanza, c2s, bare_jid);
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105
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106 if not should then
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107 module:log("debug", "Not copying stanza: %s (%s)", stanza:top_tag(), why);
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108 if why == "private" and not c2s then
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109 stanza:maptags(function(tag)
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110 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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111 return tag;
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112 end
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113 end);
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114 end
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115 return;
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116 end
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117
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118 local carbon;
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119 user_sessions = user_sessions and user_sessions.sessions;
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120 for _, session in pairs(user_sessions) do
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121 -- Carbons are sent to resources that have enabled it
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122 if session.want_carbons
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123 -- but not the resource that sent the message, or the one that it's directed to
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124 and session ~= target_session
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125 -- and isn't among the top resources that would receive the message per standard routing rules
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126 and (c2s or session.priority ~= top_priority) then
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127 if not carbon then
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128 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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129 local copy = st.clone(stanza);
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130 if c2s and not orig_to then
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131 stanza.attr.to = bare_from;
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132 end
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133 copy.attr.xmlns = "jabber:client";
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134 carbon = st.message{ from = bare_jid, type = orig_type, }
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135 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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136 :tag("forwarded", { xmlns = xmlns_forward })
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137 :add_child(copy):reset();
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138
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139 end
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140
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141 carbon.attr.to = session.full_jid;
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142 module:log("debug", "Sending carbon to %s", session.full_jid);
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143 session.send(carbon);
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144 end
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145 end
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146 end
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147
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148 local function c2s_message_handler(event)
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149 return message_handler(event, true)
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150 end
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151
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152 -- Stanzas sent by local clients
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153 module:hook("pre-message/host", c2s_message_handler, -0.5);
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154 module:hook("pre-message/bare", c2s_message_handler, -0.5);
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155 module:hook("pre-message/full", c2s_message_handler, -0.5);
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156 -- Stanzas to local clients
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157 module:hook("message/bare", message_handler, -0.5);
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158 module:hook("message/full", message_handler, -0.5);
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159
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160 module:add_feature(xmlns_carbons);