Retrieving list of all Node Subscribers

To retrieve list of node subscribers, node configuration option tigase#allow_view_subscribers must be set to true: 

<iq type='set'
    from='hamlet@denmark.lit/elsinore'
    to='pubsub.shakespeare.lit'
    id='config2'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub#owner'>
    <configure node='princely_musings'>
      <x xmlns='jabber:x:data' type='submit'>
        <field var='FORM_TYPE' type='hidden'>
          <value>http://jabber.org/protocol/pubsub#node_config</value>
        </field>
        <field var='tigase#allow_view_subscribers'><value>1</value></field>
      </x>
    </configure>
  </pubsub>
</iq>

When option is enabled, each subscriber may get list of subscribers the same way as owner. 

<iq type='get'
    from='hamlet@denmark.lit/elsinore'
    to='pubsub.shakespeare.lit'
    id='subman1'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub#owner'>
    <subscriptions node='princely_musings'/>
  </pubsub>
</iq>

There is extension to filter returned list:

<iq type='get'
    from='hamlet@denmark.lit/elsinore'
    to='pubsub.shakespeare.lit'
    id='subman1'>
  <pubsub xmlns='http://jabber.org/protocol/pubsub#owner'>
    <subscriptions node='princely_musings'>
        <filter xmlns='tigase:pubsub:1'>
            <jid contains='@denmark.lit' />
        </filter>
    </subscriptions>
  </pubsub>
</iq>

In this example will be returned all subscriptions of users from domain "denmark.lit". == Offline Message Sink :author: Bartosz Malkowski :version: v2.0 November 2016. Reformatted for v8.0.0.

Messages sent to offline users is published in pubsub node, from where that message is sent to all the node subscribers as a pubsub notification. 

<message from='pubsub.coffeebean.local' to='bard@shakespeare.lit' id='foo'>
  <event xmlns='http://jabber.org/protocol/pubsub#event'>
    <items node='message_sink'>
      <item id='ae890ac52d0df67ed7cfdf51b644e901'>
        <message type="chat" xmlns="jabber:client" id="x2ps6u0004"
          to="userB_h6x1bt0002@coffeebean.local"
          from="userA_uyhx8p0001@coffeebean.local/1149352695-tigase-20">
          <body>Hello</body>
        </message>
      </item>
    </items>
  </event>
</message>
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