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annotate mod_carbons/mod_carbons.lua @ 832:9087431d35f6

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mod_carbons: Add comments and rename some variables to make it clearer
author Kim Alvefur <zash@zash.se>
date Tue, 18 Sep 2012 18:58:13 +0200
parents 9927d88a1b2a
children 30d49c26d219
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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 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";
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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 local function message_handler(event, c2s)
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27 local origin, stanza = event.origin, event.stanza;
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28 local orig_type = stanza.attr.type;
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29 local orig_to = stanza.attr.to;
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30 local orig_from = stanza.attr.from;
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31
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32 if not (orig_type == nil
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33 or orig_type == "normal"
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34 or orig_type == "chat") then
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35 return -- No carbons for messages of type error or headline
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36 end
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37
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38 local bare_jid, user_sessions;
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39 local no_carbon_to = {};
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40 module:log("debug", "Message from %s to %s", tostring(orig_from), tostring(orig_to));
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41 if c2s then -- Stanza sent by a local client
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42 bare_jid = (origin.username.."@"..origin.host)
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43 user_sessions = host_sessions[origin.username];
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44 else -- Stanza about to be delivered to a local client
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45 local username, hostname, resource = jid_split(orig_to);
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46 bare_jid = jid_bare(orig_to);
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47 user_sessions = host_sessions[username];
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48 if resource then
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49 module:log("debug", "Message was to resource %s, it will not get carbon", resource);
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50 no_carbon_to[resource] = true;
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51 elseif user_sessions then
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52 local top_resources = user_sessions.top_resources;
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53 if top_resources then
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54 -- These will already receive this message per normal routing rules,
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55 -- so we skip them to avoid duplicated messages.
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56 for i=1,#top_resources do
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57 local resource = top_resources[i].resource;
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58 module:log("debug", "Not sending carbons to top resource %s", resource);
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59 no_carbon_to[resource] = true;
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60 end
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61 end
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62 end
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63 end
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64
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65 if not user_sessions then
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66 module:log("debug", "Skip carbons for offline user");
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67 return -- No use in sending carbons to an offline user
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68 end
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69
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70 if not c2s and stanza:get_child("private", xmlns_carbons) then
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71 stanza:maptags(function(tag)
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72 return tag.attr.xmlns == xmlns_carbons
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73 and tag.name == "private" and tag or nil;
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74 end);
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75 module:log("debug", "Message tagged private, ignoring");
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76 return
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77 end
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78
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79 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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80 local copy = st.clone(stanza);
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81 copy.attr.xmlns = "jabber:client";
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82 local carbon = st.message{ from = bare_jid, type = orig_type, }
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83 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons }):up()
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84 :tag("forwarded", { xmlns = xmlns_forward })
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85 :add_child(copy):reset();
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86
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87 -- And finally, send the carbon to the sessions that should have it.
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88 user_sessions = user_sessions and user_sessions.sessions;
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89 for resource, session in pairs(user_sessions) do
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90 local full_jid = bare_jid .. "/" .. resource;
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91 if session.want_carbons and ((c2s and session ~= origin) or (not c2s and not no_carbon_to[resource])) then
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92 carbon.attr.to = full_jid;
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93 module:log("debug", "Sending carbon to %s", full_jid);
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94 session.send(carbon);
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95 end
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96 end
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97 end
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98
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99 local function c2s_message_handler(event)
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100 return message_handler(event, true)
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101 end
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102
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103 -- Stanzas sent by local clients
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104 module:hook("pre-message/bare", c2s_message_handler, 1);
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105 module:hook("pre-message/full", c2s_message_handler, 1);
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106 -- Stanzas to local clients
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107 module:hook("message/bare", message_handler, 1);
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108 module:hook("message/full", message_handler, 1);
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109
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110 module:add_feature(xmlns_carbons);