prosody
a9ad287c3388
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 11821:a9ad287c3388

core.moduleapi: Filter out unrelated direct replies to module:send_iq This is primarily something that happens with an internal query to mod_mam, which calls origin.send() several times with results, leading to the first such result being treated as the final response and resolving the promise. Now, these responses pass trough to the underlying origin.send(), where they can be caught. Tricky but not impossible. For remote queries, it's even trickier, you would likely need to bind a resource or similar.
author Kim Alvefur <zash@zash.se>
date Fri, 24 Sep 2021 20:12:16 +0200
parent 11796:71c20650a0b4
child 11836:8ccb22c0fa56
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 --
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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 if stanza:get_child_with_attr("stanza-id", "urn:xmpp:sid:0", "by", user_bare) then
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64 return true, "archived";
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65 end
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66
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67 return false, "default";
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68 end
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69
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70 local function message_handler(event, c2s)
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71 local origin, stanza = event.origin, event.stanza;
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72 local orig_type = stanza.attr.type or "normal";
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73 local orig_from = stanza.attr.from;
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74 local bare_from = jid_bare(orig_from);
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75 local orig_to = stanza.attr.to;
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76 local bare_to = jid_bare(orig_to);
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77
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78 -- Stanza sent by a local client
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79 local bare_jid = bare_from; -- JID of the local user
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80 local target_session = origin;
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81 local top_priority = false;
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82 local user_sessions = bare_sessions[bare_from];
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83
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84 -- Stanza about to be delivered to a local client
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85 if not c2s then
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86 bare_jid = bare_to;
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87 target_session = full_sessions[orig_to];
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88 user_sessions = bare_sessions[bare_jid];
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89 if not target_session and user_sessions then
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90 -- The top resources will already receive this message per normal routing rules,
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91 -- so we are going to skip them in order to avoid sending duplicated messages.
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92 local top_resources = user_sessions.top_resources;
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93 top_priority = top_resources and top_resources[1].priority
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94 end
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95 end
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96
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97 if not user_sessions then
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98 module:log("debug", "Skip carbons for offline user");
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99 return -- No use in sending carbons to an offline user
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100 end
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101
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102 local should, why = should_copy(stanza, c2s, bare_jid);
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103
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104 if not should then
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105 module:log("debug", "Not copying stanza: %s (%s)", stanza:top_tag(), why);
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106 if why == "private" and not c2s then
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107 stanza:maptags(function(tag)
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108 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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109 return tag;
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110 end
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111 end);
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112 end
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113 return;
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114 end
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115
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116 local carbon;
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117 user_sessions = user_sessions and user_sessions.sessions;
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118 for _, session in pairs(user_sessions) do
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119 -- Carbons are sent to resources that have enabled it
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120 if session.want_carbons
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121 -- but not the resource that sent the message, or the one that it's directed to
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122 and session ~= target_session
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123 -- and isn't among the top resources that would receive the message per standard routing rules
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124 and (c2s or session.priority ~= top_priority) then
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125 if not carbon then
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126 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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127 local copy = st.clone(stanza);
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128 if c2s and not orig_to then
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129 stanza.attr.to = bare_from;
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130 end
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131 copy.attr.xmlns = "jabber:client";
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132 carbon = st.message{ from = bare_jid, type = orig_type, }
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133 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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134 :tag("forwarded", { xmlns = xmlns_forward })
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135 :add_child(copy):reset();
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136
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137 end
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138
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139 carbon.attr.to = session.full_jid;
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140 module:log("debug", "Sending carbon to %s", session.full_jid);
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141 session.send(carbon);
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142 end
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143 end
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144 end
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145
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146 local function c2s_message_handler(event)
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147 return message_handler(event, true)
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148 end
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149
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150 -- Stanzas sent by local clients
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151 module:hook("pre-message/host", c2s_message_handler, -0.5);
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152 module:hook("pre-message/bare", c2s_message_handler, -0.5);
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153 module:hook("pre-message/full", c2s_message_handler, -0.5);
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154 -- Stanzas to local clients
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155 module:hook("message/bare", message_handler, -0.5);
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156 module:hook("message/full", message_handler, -0.5);
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157
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158 module:add_feature(xmlns_carbons);