annotate mod_carbons/mod_carbons.lua @ 1268:854a3933cfcd

mod_muc_log_http: URL-encode room names. This allows special characters in room names to work. Ideally this escaping shouldn’t be done in the user visible content, but the module’s template system doesn’t currently allow that.
author Waqas Hussain <waqas20@gmail.com>
date Sat, 04 Jan 2014 16:50:57 -0500
parents 0d3d15586d7e
children d3e75f6dde9b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_carbons_old = "urn:xmpp:carbons:1";
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10 local xmlns_carbons_really_old = "urn:xmpp:carbons:0";
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11 local xmlns_forward = "urn:xmpp:forward:0";
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12 local full_sessions, bare_sessions = full_sessions, bare_sessions;
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13
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14 local function toggle_carbons(event)
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15 local origin, stanza = event.origin, event.stanza;
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16 local state = stanza.tags[1].attr.mode or 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 return origin.send(st.reply(stanza));
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20 end
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21 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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22 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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23
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24 -- COMPAT
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25 module:hook("iq-set/self/"..xmlns_carbons_old..":disable", toggle_carbons);
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26 module:hook("iq-set/self/"..xmlns_carbons_old..":enable", toggle_carbons);
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27 module:hook("iq-set/self/"..xmlns_carbons_really_old..":carbons", toggle_carbons);
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28
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29 local function message_handler(event, c2s)
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30 local origin, stanza = event.origin, event.stanza;
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31 local orig_type = stanza.attr.type;
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32 local orig_from = stanza.attr.from;
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33 local orig_to = stanza.attr.to;
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34
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35 if not (orig_type == nil
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36 or orig_type == "normal"
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37 or orig_type == "chat") then
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38 return -- No carbons for messages of type error or headline
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39 end
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40
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41 -- Stanza sent by a local client
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42 local bare_jid = jid_bare(orig_from);
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43 local target_session = origin;
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44 local top_priority = false;
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45 local user_sessions = bare_sessions[bare_jid];
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46
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47 -- Stanza about to be delivered to a local client
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48 if not c2s then
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49 bare_jid = jid_bare(orig_to);
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50 target_session = full_sessions[orig_to];
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51 user_sessions = bare_sessions[bare_jid];
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52 if not target_session and user_sessions then
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53 -- The top resources will already receive this message per normal routing rules,
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54 -- so we are going to skip them in order to avoid sending duplicated messages.
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55 local top_resources = user_sessions.top_resources;
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56 top_priority = top_resources and top_resources[1].priority
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57 end
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58 end
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59
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60 if not user_sessions then
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61 module:log("debug", "Skip carbons for offline user");
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62 return -- No use in sending carbons to an offline user
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63 end
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64
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65 if not c2s and stanza:get_child("private", xmlns_carbons) then
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66 stanza:maptags(function(tag)
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67 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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68 return tag;
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69 end
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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 elseif stanza:get_child("no-copy", "urn:xmpp:hints") then
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74 module:log("debug", "Message has no-copy hint, ignoring");
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75 return
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76 end
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77
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78 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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79 local copy = st.clone(stanza);
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80 copy.attr.xmlns = "jabber:client";
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81 local carbon = st.message{ from = bare_jid, type = orig_type, }
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82 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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83 :tag("forwarded", { xmlns = xmlns_forward })
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84 :add_child(copy):reset();
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85
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86 -- COMPAT
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87 local carbon_old = st.message{ from = bare_jid, type = orig_type, }
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88 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons_old }):up()
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89 :tag("forwarded", { xmlns = xmlns_forward })
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90 :add_child(copy):reset();
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91
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92 -- COMPAT
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93 local carbon_really_old = st.clone(stanza)
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94 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons_really_old }):up()
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95
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96 user_sessions = user_sessions and user_sessions.sessions;
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97 for _, session in pairs(user_sessions) do
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98 -- Carbons are sent to resources that have enabled it
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99 if session.want_carbons
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100 -- but not the resource that sent the message, or the one that it's directed to
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101 and session ~= target_session
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102 -- and isn't among the top resources that would receive the message per standard routing rules
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103 and (c2s or session.priority ~= top_priority)
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104 -- don't send v0 carbons (or copies) for c2s
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105 and (not c2s or session.want_carbons ~= xmlns_carbons_really_old) then
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106 carbon.attr.to = session.full_jid;
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107 module:log("debug", "Sending carbon to %s", session.full_jid);
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108 local carbon = session.want_carbons == xmlns_carbons_old and carbon_old -- COMPAT
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109 or session.want_carbons == xmlns_carbons_really_old and carbon_really_old -- COMPAT
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110 or carbon;
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111 session.send(carbon);
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112 end
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113 end
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114 end
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115
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116 local function c2s_message_handler(event)
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117 return message_handler(event, true)
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118 end
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119
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120 -- Stanzas sent by local clients
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121 module:hook("pre-message/host", c2s_message_handler, 1);
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122 module:hook("pre-message/bare", c2s_message_handler, 1);
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123 module:hook("pre-message/full", c2s_message_handler, 1);
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124 -- Stanzas to local clients
480
0cef5be669de mod_carbons: Consolidate message handlers
Kim Alvefur <zash@zash.se>
parents: 463
diff changeset
125 module:hook("message/bare", message_handler, 1);
0cef5be669de mod_carbons: Consolidate message handlers
Kim Alvefur <zash@zash.se>
parents: 463
diff changeset
126 module:hook("message/full", message_handler, 1);
462
f28a3f260fc2 mod_carbons: Initial commit.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
127
f28a3f260fc2 mod_carbons: Initial commit.
Kim Alvefur <zash@zash.se>
parents:
diff changeset
128 module:add_feature(xmlns_carbons);
854
1c64ab8ae374 mod_carbons: Advertise support for the previous version
Kim Alvefur <zash@zash.se>
parents: 850
diff changeset
129 module:add_feature(xmlns_carbons_old);
888
f8d08f8ed7de mod_carbons: Make support for v0 disabled by default, don't send v0 carbons for c2s
Michael Holzt <kju@fqdn.org>
parents: 884
diff changeset
130 if module:get_option_boolean("carbons_v0") then
f8d08f8ed7de mod_carbons: Make support for v0 disabled by default, don't send v0 carbons for c2s
Michael Holzt <kju@fqdn.org>
parents: 884
diff changeset
131 module:add_feature(xmlns_carbons_really_old);
f8d08f8ed7de mod_carbons: Make support for v0 disabled by default, don't send v0 carbons for c2s
Michael Holzt <kju@fqdn.org>
parents: 884
diff changeset
132 end