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annotate mod_carbons/mod_carbons.lua @ 854:1c64ab8ae374

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mod_carbons: Advertise support for the previous version
author Kim Alvefur <zash@zash.se>
date Sat, 27 Oct 2012 20:02:10 +0200
parents 0900ba54991e
children 2ece37bf9cc6
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6d0d2673f95e mod_carbons: Add MIT license statement.
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diff changeset
1 -- XEP-0280: Message Carbons implementation for Prosody
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2 -- Copyright (C) 2011 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_carbons_old = "urn:xmpp:carbons:1";
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10 local xmlns_forward = "urn:xmpp:forward:0";
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11 local full_sessions, bare_sessions = full_sessions, bare_sessions;
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12
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13 local function toggle_carbons(event)
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14 local origin, stanza = event.origin, event.stanza;
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15 if stanza.attr.type == "set" then
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16 local state = stanza.tags[1].name;
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17 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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18 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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19 origin.send(st.reply(stanza));
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20 return true
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21 end
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22 end
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23 module:hook("iq/self/"..xmlns_carbons..":disable", toggle_carbons);
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24 module:hook("iq/self/"..xmlns_carbons..":enable", toggle_carbons);
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25
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26 -- COMPAT
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27 module:hook("iq/self/"..xmlns_carbons_old..":disable", toggle_carbons);
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28 module:hook("iq/self/"..xmlns_carbons_old..":enable", toggle_carbons);
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29
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30 local function message_handler(event, c2s)
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31 local origin, stanza = event.origin, event.stanza;
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32 local orig_type = stanza.attr.type;
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33 local orig_from = stanza.attr.from;
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34 local orig_to = stanza.attr.to;
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35
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36 if not (orig_type == nil
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37 or orig_type == "normal"
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38 or orig_type == "chat") then
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39 return -- No carbons for messages of type error or headline
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40 end
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41
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42 -- Stanza sent by a local client
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43 local bare_jid = jid_bare(orig_from);
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44 local target_session = origin;
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45 local top_priority = false;
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46 local user_sessions = bare_sessions[bare_jid];
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47
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48 -- Stanza about to be delivered to a local client
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49 if not c2s then
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50 bare_jid = jid_bare(orig_to);
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51 target_session = full_sessions[orig_to];
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52 user_sessions = bare_sessions[bare_jid];
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53 if not target_session and user_sessions then
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54 -- The top resources will already receive this message per normal routing rules,
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55 -- so we are going to skip them in order to avoid sending duplicated messages.
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56 local top_resources = user_sessions.top_resources;
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57 top_priority = top_resources and top_resources[1].priority
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58 end
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59 end
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60
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61 if not user_sessions then
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62 module:log("debug", "Skip carbons for offline user");
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63 return -- No use in sending carbons to an offline user
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64 end
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65
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66 if not c2s and stanza:get_child("private", xmlns_carbons) then
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67 stanza:maptags(function(tag)
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68 return tag.attr.xmlns == xmlns_carbons
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69 and tag.name == "private" and tag or nil;
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70 end);
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71 module:log("debug", "Message tagged private, ignoring");
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72 return
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73 end
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74
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75 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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76 local copy = st.clone(stanza);
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77 copy.attr.xmlns = "jabber:client";
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78 local carbon = st.message{ from = bare_jid, type = orig_type, }
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79 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons }):up()
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80 :tag("forwarded", { xmlns = xmlns_forward })
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81 :add_child(copy):reset();
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82
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83 -- COMPAT
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84 local carbon_old = st.message{ from = bare_jid, type = orig_type, }
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85 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons_old }):up()
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86 :tag("forwarded", { xmlns = xmlns_forward })
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87 :add_child(copy):reset();
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88
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89 user_sessions = user_sessions and user_sessions.sessions;
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90 for _, session in pairs(user_sessions) do
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91 -- Carbons are sent to resources that have enabled it
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92 if session.want_carbons
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93 -- but not the resource that sent the message, or the one that it's directed to
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94 and session ~= target_session
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95 -- and isn't among the top resources that would receive the message per standard routing rules
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96 and (c2s or session.priority ~= top_priority) then
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97 carbon.attr.to = session.full_jid;
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98 module:log("debug", "Sending carbon to %s", session.full_jid);
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99 local carbon = session.want_carbons == xmlns_carbons_old and carbon_old or carbon; -- COMPAT
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100 session.send(carbon);
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101 end
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102 end
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103 end
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104
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105 local function c2s_message_handler(event)
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106 return message_handler(event, true)
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107 end
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108
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109 -- Stanzas sent by local clients
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110 module:hook("pre-message/bare", c2s_message_handler, 1);
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111 module:hook("pre-message/full", c2s_message_handler, 1);
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112 -- Stanzas to local clients
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113 module:hook("message/bare", message_handler, 1);
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114 module:hook("message/full", message_handler, 1);
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115
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116 module:add_feature(xmlns_carbons);
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117 module:add_feature(xmlns_carbons_old);