prosody
be87ab2d611c
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 6841:be87ab2d611c

plugins: Explicitly return to halt event propagation (session.send sometimes does not return true)
author Kim Alvefur <zash@zash.se>
date Mon, 21 Sep 2015 23:06:22 +0200
parent 6804:9f40ae38f0de
child 7670:2be85cb3bc66
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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: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 orig_to = stanza.attr.to;
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28
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29 if not(orig_type == "chat" or orig_type == "normal" and stanza:get_child("body")) then
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30 return -- Only chat type messages
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31 end
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32
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33 -- Stanza sent by a local client
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34 local bare_jid = jid_bare(orig_from);
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35 local target_session = origin;
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36 local top_priority = false;
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37 local user_sessions = bare_sessions[bare_jid];
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38
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39 -- Stanza about to be delivered to a local client
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40 if not c2s then
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41 bare_jid = jid_bare(orig_to);
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42 target_session = full_sessions[orig_to];
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43 user_sessions = bare_sessions[bare_jid];
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44 if not target_session and user_sessions then
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45 -- The top resources will already receive this message per normal routing rules,
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46 -- so we are going to skip them in order to avoid sending duplicated messages.
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47 local top_resources = user_sessions.top_resources;
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48 top_priority = top_resources and top_resources[1].priority
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49 end
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50 end
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51
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52 if not user_sessions then
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53 module:log("debug", "Skip carbons for offline user");
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54 return -- No use in sending carbons to an offline user
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55 end
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56
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57 if stanza:get_child("private", xmlns_carbons) then
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58 if not c2s then
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59 stanza:maptags(function(tag)
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60 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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61 return tag;
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62 end
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63 end);
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64 end
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65 module:log("debug", "Message tagged private, ignoring");
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66 return
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67 elseif stanza:get_child("no-copy", "urn:xmpp:hints") then
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68 module:log("debug", "Message has no-copy hint, ignoring");
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69 return
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70 elseif stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
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71 module:log("debug", "MUC PM, 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 })
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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 user_sessions = user_sessions and user_sessions.sessions;
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84 for _, session in pairs(user_sessions) do
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85 -- Carbons are sent to resources that have enabled it
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86 if session.want_carbons
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87 -- but not the resource that sent the message, or the one that it's directed to
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88 and session ~= target_session
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89 -- and isn't among the top resources that would receive the message per standard routing rules
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90 and (c2s or session.priority ~= top_priority) then
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91 carbon.attr.to = session.full_jid;
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92 module:log("debug", "Sending carbon to %s", session.full_jid);
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93 session.send(carbon);
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94 end
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95 end
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96 end
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97
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98 local function c2s_message_handler(event)
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99 return message_handler(event, true)
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100 end
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101
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102 -- Stanzas sent by local clients
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103 module:hook("pre-message/host", c2s_message_handler, 1);
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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);
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
108 module:hook("message/full", message_handler, 1);
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
109
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
110 module:add_feature(xmlns_carbons);