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annotate mod_carbons/mod_carbons.lua @ 585:ce2798a1bc56

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mod_carbons: Don't try to send carbons for entirely offline users.
author Kim Alvefur <zash@zash.se>
date Sat, 28 Jan 2012 15:10:04 +0100
parents 77f350635f4f
children 5175f6d33470
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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 jid_split = require "util.jid".split;
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9 local xmlns_carbons = "urn:xmpp:carbons:1";
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10 local xmlns_forward = "urn:xmpp:forward:0";
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11 local host_sessions = hosts[module.host].sessions;
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12
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13 module:hook("iq/self/"..xmlns_carbons..":enable", function(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 module:log("debug", "%s enabled carbons", origin.full_jid);
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17 origin.want_carbons = true;
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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
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23 module:hook("iq/self/"..xmlns_carbons..":disable", function(event)
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24 local origin, stanza = event.origin, event.stanza;
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25 if stanza.attr.type == "set" then
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26 module:log("debug", "%s disabled carbons", origin.full_jid);
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27 origin.want_carbons = nil;
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28 origin.send(st.reply(stanza));
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29 return true
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30 end
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31 end);
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32
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33 local function message_handler(event, c2s)
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34 local origin, stanza = event.origin, event.stanza;
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35 local orig_type = stanza.attr.type;
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36 local orig_to = stanza.attr.to;
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37 local orig_from = stanza.attr.from;
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38
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39 if not (orig_type == nil
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40 or orig_type == "normal"
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41 or orig_type == "chat") then
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42 return -- No carbons for messages of type error or headline
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43 end
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44
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45 local bare_jid, user_sessions;
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46 local no_carbon_to = {};
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47 module:log("debug", "origin (%s) type: %s", tostring(origin), origin.type)
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48 if c2s then -- Stanza sent by a local client
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49 bare_jid = (origin.username.."@"..origin.host)
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50 user_sessions = host_sessions[origin.username];
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51 else -- Stanza about to be delivered to a local client
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52 local username, hostname, resource = jid_split(orig_to);
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53 bare_jid = jid_bare(orig_to);
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54 user_sessions = host_sessions[username];
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55 if resource then
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56 no_carbon_to[resource] = true;
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57 elseif user_sessions then
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58 local top_resources = user_sessions.top_resources;
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59 if top_resources then
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60 for _, session in ipairs(top_resources) do
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61 no_carbon_to[session.resource] = true;
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62 end
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63 end
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64 end
462
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65 end
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66
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67 if not user_sessions then
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68 return -- No use in sending carbons to an offline user
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69 end
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70
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71 if not c2s and stanza:get_child("private", xmlns_carbons) then
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72 stanza:maptags(function(tag)
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73 return tag.attr.xmlns == xmlns_carbons
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74 and tag.name == "private" and tag or nil;
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75 end);
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76 return
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77 end
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78
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79 if not stanza:get_child("forwarded", xmlns_forward) then
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80 user_sessions = user_sessions and user_sessions.sessions;
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81 for resource, session in pairs(user_sessions) do
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82 local full_jid = bare_jid .. "/" .. resource;
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83 if session.want_carbons then
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84 if (c2s and session ~= origin) or (not c2s and not no_carbon_to[resource]) then
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85 local msg = st.clone(stanza);
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86 msg.attr.xmlns = msg.attr.xmlns or "jabber:client";
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87 local fwd = st.message{
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88 from = bare_jid,
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89 to = full_jid,
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90 type = orig_type,
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91 }
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92 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons }):up()
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93 :tag("forwarded", { xmlns = xmlns_forward })
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94 :add_child(msg);
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95 core_post_stanza(origin, fwd);
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96 end
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97 end
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98 end
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99 end
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100 end
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101
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102 local function c2s_message_handler(event)
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103 return message_handler(event, true)
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104 end
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105
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106 -- Stanzas sent by local clients
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107 module:hook("pre-message/bare", c2s_message_handler, 1);
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108 module:hook("pre-message/full", c2s_message_handler, 1);
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109 -- Stanzas to local clients
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110 module:hook("message/bare", message_handler, 1);
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111 module:hook("message/full", message_handler, 1);
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112
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113 module:add_feature(xmlns_carbons);