prosody-modules
5961e01dd963
mod_pubsub_subscription/mod_pubsub_subscription.lua

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mod_pubsub_subscription/mod_pubsub_subscription.lua @ 6152:5961e01dd963

mod_anti_spam: Allow customizing spam actions (drop/bounce), switching default to bounce
author Matthew Wild <mwild1@gmail.com>
date Fri, 17 Jan 2025 10:29:28 +0000
parent 6119:6dca425eea15
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rev   line source
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1 local id = require "util.id";
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2 local st = require "util.stanza";
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3 local uuid = require "util.uuid";
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4 local mt = require "util.multitable";
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5 local cache = require "util.cache";
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6
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7 local xmlns_pubsub = "http://jabber.org/protocol/pubsub";
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8 local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event";
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9
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10 -- TODO persist
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11 -- TODO query known pubsub nodes to sync current subscriptions
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12 -- TODO subscription ids per 'item' would be handy
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13
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14 local pending_subscription = cache.new(256); -- uuid → node
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15 local pending_unsubscription = cache.new(256); -- uuid → node
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16 local active_subscriptions = mt.new() -- service | node | subscriber | uuid | { item }
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17 function module.save()
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18 return { active_subscriptions = active_subscriptions.data }
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19 end
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20 function module.restore(data)
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21 if data and data.active_subscriptions then
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22 active_subscriptions.data = data.active_subscriptions
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23 end
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24 end
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25
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26 local valid_events = {"subscribed"; "unsubscribed"; "error"; "item"; "retract"; "purge"; "delete"}
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27
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28 local function subscription_added(item_event)
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29 local item = item_event.item;
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30 assert(item.service, "pubsub subscription item MUST have a 'service' field.");
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31 assert(item.node, "pubsub subscription item MUST have a 'node' field.");
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32 item.from = item.from or module.host;
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33
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34 local already_subscibed = false;
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35 for _ in active_subscriptions:iter(item.service, item.node, item.from, nil) do -- luacheck: ignore 512
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36 already_subscibed = true;
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37 break
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38 end
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39
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40 item._id = uuid.generate();
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41 local iq_id = "pubsub-sub-"..id.short();
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42 pending_subscription:set(iq_id, item._id);
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43 active_subscriptions:set(item.service, item.node, item.from, item._id, item);
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44
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45 if not already_subscibed then
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46 module:send(st.iq({ type = "set", id = iq_id, from = item.from, to = item.service })
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47 :tag("pubsub", { xmlns = xmlns_pubsub })
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48 :tag("subscribe", { jid = item.from, node = item.node }));
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49 end
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50 end
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51
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52 for _, event_name in ipairs(valid_events) do
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53 module:hook("pubsub-event/host/"..event_name, function (event)
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54 for _, _, _, _, _, cb in active_subscriptions:iter(event.service, event.node, event.stanza.attr.to, nil, "on_"..event_name) do
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55 event.handled = true;
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56 pcall(cb, event);
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57 end
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58 end);
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59
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60 module:hook("pubsub-event/bare/"..event_name, function (event)
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61 for _, _, _, _, _, cb in active_subscriptions:iter(event.service, event.node, event.stanza.attr.to, nil, "on_"..event_name) do
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62 event.handled = true;
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63 pcall(cb, event);
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64 end
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65 end);
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66 end
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67
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68 function handle_iq(context, event)
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69 local stanza = event.stanza;
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70 local service = stanza.attr.from;
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71
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72 if not stanza.attr.id then return end -- shouldn't be possible
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73 if not stanza.attr.id:match("^pubsub%-sub%-") then return end
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74
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75 local subscribed_node = pending_subscription:get(stanza.attr.id);
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76 pending_subscription:set(stanza.attr.id, nil);
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77 local unsubscribed_node = pending_unsubscription:get(stanza.attr.id);
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78 pending_unsubscription:set(stanza.attr.id, nil);
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79
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80 if stanza.attr.type == "result" then
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81 local pubsub_wrapper = stanza:get_child("pubsub", xmlns_pubsub);
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82 local subscription = pubsub_wrapper and pubsub_wrapper:get_child("subscription");
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83 if not subscription then return end
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84 local node = subscription.attr.node;
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85
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86 local what;
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87 if subscription.attr.subscription == "subscribed" then
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88 what = "on_subscribed";
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89 elseif subscription.attr.subscription == "none" then
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90 what = "on_unsubscribed";
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91 end
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92 if not what then return end -- there are other states but we don't handle them
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93 for _, _, _, _, _, cb in active_subscriptions:iter(service, node, stanza.attr.to, nil, what) do
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94 cb(event);
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95 end
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96 return true;
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97
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98 elseif stanza.attr.type == "error" then
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99 local node = subscribed_node or unsubscribed_node;
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100 local error_type, error_condition, reason, pubsub_error = stanza:get_error();
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101 local err = { type = error_type, condition = error_condition, text = reason, extra = pubsub_error };
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102 if active_subscriptions:get(service) then
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103 for _, _, _, _, _, cb in active_subscriptions:iter(service, node, stanza.attr.to, nil, "on_error") do
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104 cb(err);
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105 end
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106 return true;
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107 end
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108 end
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109 end
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110
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111 module:hook("iq/host", function (event)
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112 handle_iq("host", event);
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113 end, 1);
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114
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115 module:hook("iq/bare", function (event)
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116 handle_iq("bare", event);
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117 end, 1);
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118
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119 local function subscription_removed(item_event)
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120 local item = item_event.item;
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121 active_subscriptions:set(item.service, item.node, item.from, item._id, nil);
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122 local node_subs = active_subscriptions:get(item.service, item.node, item.from);
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123 if node_subs and next(node_subs) then return end
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124
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125 local iq_id = "pubsub-sub-"..id.short();
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126 pending_unsubscription:set(iq_id, item._id);
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127
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128 module:send(st.iq({ type = "set", id = iq_id, from = item.from, to = item.service })
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129 :tag("pubsub", { xmlns = xmlns_pubsub })
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130 :tag("unsubscribe", { jid = item.from, node = item.node }))
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131 end
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132
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133 module:handle_items("pubsub-subscription", subscription_added, subscription_removed, true);
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134
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135 function handle_message(context, event)
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136 local origin, stanza = event.origin, event.stanza;
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137 local handled = nil;
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138 local service = stanza.attr.from;
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139 module:log("debug", "Got message/%s: %s", context, stanza:top_tag());
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140 for event_container in stanza:childtags("event", xmlns_pubsub_event) do
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141 for pubsub_event in event_container:childtags() do
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142 module:log("debug", "Got pubsub event %s", pubsub_event:top_tag());
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143 local node = pubsub_event.attr.node;
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144 local event_data = {
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145 stanza = stanza;
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146 origin = origin;
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147 event = pubsub_event;
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148 service = service;
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149 node = node;
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150 handled = false;
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151 };
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152 module:fire_event("pubsub-event/" .. context .. "/"..pubsub_event.name, event_data);
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153 if not handled and event_data.handled then
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154 handled = true;
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155 end
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156 end
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157 end
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158 -- If not addressed to the host, let it fall through to normal handling
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159 -- (it may be on its way to a local client), otherwise, we'll mark the
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160 -- event as handled to suppress an error response if we handled it.
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161 if context == "host" and handled then
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162 return true;
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163 end
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164 end
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165
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166 module:hook("message/host", function(event)
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167 return handle_message("host", event);
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168 end);
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169
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170 module:hook("message/bare", function(event)
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171 return handle_message("bare", event);
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172 end);
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173
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174
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175 function handle_items(context, event)
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176 for item in event.event:childtags() do
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177 module:log("debug", "Got pubsub item event %s", item:top_tag());
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178 event.item = item;
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179 event.payload = item.tags[1];
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180 module:fire_event("pubsub-event/" .. context .. "/"..item.name, event);
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181 end
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182 end
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183
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184 module:hook("pubsub-event/host/items", function (event)
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185 handle_items("host", event);
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186 end);
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187
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188 module:hook("pubsub-event/bare/items", function (event)
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189 handle_items("bare", event);
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190 end);