Annotate

plugins/mod_carbons.lua @ 12089:76b4e3f12b53 0.11 0.11.11

mod_pep: Wipe pubsub service on user deletion Data is already wiped from storage, but this ensures everything is properly unsubscribed, possibly with notifications etc. Clears recipient cache as well, since it is no longer relevant.
author Kim Alvefur <zash@zash.se>
date Thu, 04 Nov 2021 01:00:06 +0100
parent 10777:3695904d2854
child 10778:a62b981db0e2
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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 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 message_handler(event, c2s)
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24 local origin, stanza = event.origin, event.stanza;
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25 local orig_type = stanza.attr.type or "normal";
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26 local orig_from = stanza.attr.from;
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27 local bare_from = jid_bare(orig_from);
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28 local orig_to = stanza.attr.to;
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29 local bare_to = jid_bare(orig_to);
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30
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31 if not(orig_type == "chat" or (orig_type == "normal" and stanza:get_child("body"))) then
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32 return -- Only chat type messages
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33 end
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34
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35 -- Stanza sent by a local client
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36 local bare_jid = bare_from; -- JID of the local user
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37 local target_session = origin;
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38 local top_priority = false;
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39 local user_sessions = bare_sessions[bare_from];
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40
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41 -- Stanza about to be delivered to a local client
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42 if not c2s then
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43 bare_jid = bare_to;
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44 target_session = full_sessions[orig_to];
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45 user_sessions = bare_sessions[bare_jid];
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46 if not target_session and user_sessions then
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47 -- The top resources will already receive this message per normal routing rules,
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48 -- so we are going to skip them in order to avoid sending duplicated messages.
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49 local top_resources = user_sessions.top_resources;
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50 top_priority = top_resources and top_resources[1].priority
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51 end
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52 end
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53
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54 if not user_sessions then
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55 module:log("debug", "Skip carbons for offline user");
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56 return -- No use in sending carbons to an offline user
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57 end
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58
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59 if stanza:get_child("private", xmlns_carbons) then
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60 if not c2s then
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61 stanza:maptags(function(tag)
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62 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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63 return tag;
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64 end
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65 end);
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66 end
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67 module:log("debug", "Message tagged private, ignoring");
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68 return
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69 elseif stanza:get_child("no-copy", "urn:xmpp:hints") then
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70 module:log("debug", "Message has no-copy hint, ignoring");
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71 return
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72 elseif not c2s and bare_jid ~= orig_to and stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
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73 module:log("debug", "MUC PM, ignoring");
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74 return
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75 end
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76
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77 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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78 local copy = st.clone(stanza);
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79 if c2s and not orig_to then
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80 stanza.attr.to = bare_from;
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81 end
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82 copy.attr.xmlns = "jabber:client";
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83 local carbon = st.message{ from = bare_jid, type = orig_type, }
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84 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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85 :tag("forwarded", { xmlns = xmlns_forward })
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86 :add_child(copy):reset();
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87
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88 user_sessions = user_sessions and user_sessions.sessions;
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89 for _, session in pairs(user_sessions) do
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90 -- Carbons are sent to resources that have enabled it
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91 if session.want_carbons
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92 -- but not the resource that sent the message, or the one that it's directed to
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93 and session ~= target_session
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94 -- and isn't among the top resources that would receive the message per standard routing rules
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95 and (c2s or session.priority ~= top_priority) then
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96 carbon.attr.to = session.full_jid;
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97 module:log("debug", "Sending carbon to %s", session.full_jid);
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98 session.send(carbon);
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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 function c2s_message_handler(event)
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104 return message_handler(event, true)
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105 end
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106
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107 -- Stanzas sent by local clients
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108 module:hook("pre-message/host", c2s_message_handler, -0.5);
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
109 module:hook("pre-message/bare", c2s_message_handler, -0.5);
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
110 module:hook("pre-message/full", c2s_message_handler, -0.5);
6546
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
111 -- Stanzas to local clients
7718
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
112 module:hook("message/bare", message_handler, -0.5);
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
113 module:hook("message/full", message_handler, -0.5);
6546
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
114
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
115 module:add_feature(xmlns_carbons);