prosody-modules
f59334da6df9
mod_presence_cache/mod_presence_cache.lua

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mod_presence_cache/mod_presence_cache.lua @ 3492:f59334da6df9

mod_conversejs: Show fallback text if converse.js fails to load (thanks MattJ) This can happen if javascript is enabled but 3rd party resources are blocked, or some other error happened.
author Kim Alvefur <zash@zash.se>
date Tue, 19 Mar 2019 19:43:13 +0100
parent 3373:322e8e7ba7d4
child 3760:830a01443a2f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 -- XEP-0280: Message Carbons implementation for Prosody
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2 -- Copyright (C) 2015-2016 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 is_contact_subscribed = require"core.rostermanager".is_contact_subscribed;
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7 local jid_split = require"util.jid".split;
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8 local jid_bare = require"util.jid".bare;
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9 local jid_host = require"util.jid".host;
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10 local st = require"util.stanza";
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11 local datetime = require"util.datetime";
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12 local cache = require "util.cache";
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13
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14 local cache_size = module:get_option_number("presence_cache_size", 100);
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15
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16 local bare_cache = {}; -- [username NUL bare_jid] = { [full_jid] = { timestamp, ... } }
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17
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18 local function on_evict(cache_key)
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19 local bare_cache_key = cache_key:match("^%Z+%z[^/]+");
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20 local full_jid = cache_key:match("%z(.*)$");
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21 local jids = bare_cache[bare_cache_key];
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22
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23 if jids then
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24 jids[full_jid] = nil;
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25 if next(jids) == nil then
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26 bare_cache[bare_cache_key] = nil;
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27 end
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28 end
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29 end
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30
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31 -- used indirectly for the on_evict callback
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32 local presence_cache = cache.new(cache_size, on_evict);
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33
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34 local function cache_hook(event)
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35 local origin, stanza = event.origin, event.stanza;
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36 local typ = stanza.attr.type;
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37 module:log("debug", "Cache hook, got %s from a %s", stanza:top_tag(), origin.type);
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38 if origin.type == "s2sin" and ( typ == nil or typ == "unavailable" ) then
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39
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40 local contact_full = stanza.attr.from;
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41 local contact_bare = jid_bare(contact_full);
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42 local username, host = jid_split(stanza.attr.to);
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43
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44 if not is_contact_subscribed(username, host, contact_bare) then
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45 module:log("debug", "Presence from jid not in roster");
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46 return;
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47 end
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48
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49 local cache_key = username .. "\0" .. contact_full;
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50 local bare_cache_key = username .. "\0" .. contact_bare;
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51
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52 local jids = bare_cache[bare_cache_key];
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53
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54 if typ == "unavailable" then -- remove from cache
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55 presence_cache:set(cache_key, nil);
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56 on_evict(cache_key);
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57 return;
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58 end
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59
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60 local presence_bits = {
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61 stamp = datetime.datetime();
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62 show = stanza:get_child_text("show");
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63 };
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64 if jids then
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65 jids[contact_full] = presence_bits;
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66 else
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67 jids = { [contact_full] = presence_bits };
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68 bare_cache[bare_cache_key] = jids;
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69 end
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70 presence_cache:set(cache_key, true);
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71 end
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72 end
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73
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74 module:hook("presence/bare", cache_hook, 10);
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75 -- module:hook("presence/full", cache_hook, 10);
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76
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77 local function answer_probe_from_cache(event)
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78 local origin, stanza = event.origin, event.stanza;
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79 if stanza.attr.type ~= "probe" then return; end
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80
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81 local username = origin.username;
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82 local contact_bare = stanza.attr.to;
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83 if not contact_bare then return; end -- probe to self
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84
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85 local bare_cache_key = username .. "\0" .. contact_bare;
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86
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87 local cached = bare_cache[bare_cache_key];
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88 if not cached then return end
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89 local user_bare = jid_bare(origin.full_jid);
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90 for jid, presence_bits in pairs(cached) do
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91 local presence = st.presence({ to = origin.full_jid, from = jid })
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92 if presence_bits.show then
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93 presence:tag("show"):text(presence_bits.show):up();
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94 end
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95 if presence_bits.stamp then
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96 presence:tag("delay", { xmlns = "urn:xmpp:delay", from = user_bare, stamp = presence_bits.stamp }):up();
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97 end
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98 origin.send(presence);
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99 end
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100 end
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101
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102 module:hook("pre-presence/bare", answer_probe_from_cache, 10);
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103
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104 local function clear_cache_from_s2s(remote, reason)
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105 if not remote then return end
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106 if reason and reason:find("timeout") then return end -- Ignore connections closed for being idle
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107
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108 module:log("debug", "Dropping cached presence from host %s", remote);
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109
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110 for bare, cached in pairs(bare_cache) do
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111 if jid_host(bare) == remote then
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112 for jid in pairs(cached) do
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113 presence_cache:set(jid, nil);
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114 end
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115 bare_cache[bare] = nil;
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116 end
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117 end
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118 end
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119
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120 module:hook("s2sin-destroyed", function (event)
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121 return clear_cache_from_s2s(event.session.from_host, event.reason);
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122 end);
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123
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124 module:hook("s2sout-destroyed", function (event)
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125 return clear_cache_from_s2s(event.session.to_host, event.reason);
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126 end);