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plugins/mod_carbons.lua @ 9690:75ed3403065d
lint: No longer ignore access to the deprecated global 'unpack'
_G.unpack is deprecated in Lua 5.2
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 08 Dec 2018 17:07:28 +0100 |
parent | 8354:b41947a0fc0c |
child | 10469:658b759a1f7a |
child | 10777:3695904d2854 |
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 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_from 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); |
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109 module:hook("pre-message/bare", c2s_message_handler, -0.5); |
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110 module:hook("pre-message/full", c2s_message_handler, -0.5); |
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111 -- Stanzas to local clients |
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112 module:hook("message/bare", message_handler, -0.5); |
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113 module:hook("message/full", message_handler, -0.5); |
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114 |
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115 module:add_feature(xmlns_carbons); |