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annotate mod_carbons/mod_carbons.lua @ 836:a86131581180

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mod_carbons: Less complicated assignments (thanks waqas)
author Kim Alvefur <zash@zash.se>
date Sat, 22 Sep 2012 01:56:59 +0200
parents 07cc1efde2f8
children 0ef11dee7050
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6d0d2673f95e mod_carbons: Add MIT license statement.
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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:1";
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9 local xmlns_forward = "urn:xmpp:forward:0";
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10 local full_sessions, bare_sessions = full_sessions, 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 if stanza.attr.type == "set" then
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15 local state = stanza.tags[1].name;
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16 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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17 origin.want_carbons = state == "enable";
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18 origin.send(st.reply(stanza));
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19 return true
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20 end
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21 end
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22 module:hook("iq/self/"..xmlns_carbons..":disable", toggle_carbons);
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23 module:hook("iq/self/"..xmlns_carbons..":enable", toggle_carbons);
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24
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25 local function message_handler(event, c2s)
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26 local origin, stanza = event.origin, event.stanza;
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27 local orig_type = stanza.attr.type;
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28 local orig_from = stanza.attr.from;
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29 local orig_to = stanza.attr.to;
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30
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31 if not (orig_type == nil
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32 or orig_type == "normal"
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33 or orig_type == "chat") then
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34 return -- No carbons for messages of type error or headline
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35 end
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36
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37 -- Stanza sent by a local client
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38 local bare_jid = jid_bare(orig_from);
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39 local target_session = origin;
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40 local top_priority = false;
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41 local user_sessions = bare_sessions[bare_jid];
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42
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43 -- Stanza about to be delivered to a local client
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44 if not c2s then
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45 bare_jid = jid_bare(orig_to);
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46 target_session = full_sessions[orig_to];
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47 user_sessions = bare_sessions[bare_jid];
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48 if not target_session and user_sessions then
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49 -- The top resources will already receive this message per normal routing rules,
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50 -- so we are going to skip them in order to avoid sending duplicated messages.
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51 local top_resources = user_sessions.top_resources;
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52 top_priority = top_resources and top_resources[1].priority
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53 end
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54 end
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55
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56 if not user_sessions then
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57 module:log("debug", "Skip carbons for offline user");
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58 return -- No use in sending carbons to an offline user
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59 end
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60
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61 if not c2s and stanza:get_child("private", xmlns_carbons) then
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62 stanza:maptags(function(tag)
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63 return tag.attr.xmlns == xmlns_carbons
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64 and tag.name == "private" and tag or nil;
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65 end);
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66 module:log("debug", "Message tagged private, ignoring");
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67 return
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68 end
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69
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70 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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71 local copy = st.clone(stanza);
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72 copy.attr.xmlns = "jabber:client";
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73 local carbon = st.message{ from = bare_jid, type = orig_type, }
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74 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons }):up()
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75 :tag("forwarded", { xmlns = xmlns_forward })
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76 :add_child(copy):reset();
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77
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78 user_sessions = user_sessions and user_sessions.sessions;
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79 for _, session in pairs(user_sessions) do
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80 -- Carbons are sent to resources that have enabled it
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81 if session.want_carbons
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82 -- but not the resource that sent the message, or the one that it's directed to
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83 and session ~= target_session
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84 -- and isn't among the top resources that would receive the message per standard routing rules
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85 and (not c2s or session.priority ~= top_priority) then
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86 carbon.attr.to = session.full_jid;
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87 module:log("debug", "Sending carbon to %s", session.full_jid);
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88 session.send(carbon);
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89 end
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90 end
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91 end
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92
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93 local function c2s_message_handler(event)
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94 return message_handler(event, true)
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95 end
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96
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97 -- Stanzas sent by local clients
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98 module:hook("pre-message/bare", c2s_message_handler, 1);
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99 module:hook("pre-message/full", c2s_message_handler, 1);
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100 -- Stanzas to local clients
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101 module:hook("message/bare", message_handler, 1);
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102 module:hook("message/full", message_handler, 1);
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103
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104 module:add_feature(xmlns_carbons);