XEP-xxxx: Recipient Server Side Notifications Filtering

3.1 Switching protocols¶

Since we require the implementations to be backwards compatible, we need a mechanism for a sender to know if the recipient's server supports the modern protocol or not.

To know this, sender's server should check recipient's capabilities as described at Entity Capabilities (XEP-0115) [2] in the "Stream Feature" section: if the server supports the "urn:xmpp:tmp:rsf" feature then the server SHOULD use the protocol that's described here, if the server lacks support of this feature or doesn't provide its capabilities at all then the sender MUST NOT use this protocol.

3.2 Sending and receiving a notification¶

When using this protocol to deliver notifications, the server MUST follow these rules:

• send all the notifications that can be generated by the pubsub node without any care of node settings to make it possible for users to choose which notifications they want to receive instead.

        
<message from='user@example.net'
         to='user1@example.com'>
  <event xmlns='http://jabber.org/protocol/pubsub#event'>
    <items node='n48ad4fj78zn38st734'>
      <item id='i1s2d3f4g5h6bjeh936'>
        <geoloc xmlns='http://jabber.org/protocol/geoloc'>
          <description>Venice</description>
          <lat>45.44</lat>
          <lon>12.33</lon>
        </geoloc>
      </item>
    </items>
  </event>
</message>
<message from='user@example.net'
         to='user2@example.com'>
  <event xmlns='http://jabber.org/protocol/pubsub#event'>
    <items node='n48ad4fj78zn38st734'>
      <item id='i1s2d3f4g5h6bjeh936'>
        <geoloc xmlns='http://jabber.org/protocol/geoloc'>
          <description>Venice</description>
          <lat>45.44</lat>
          <lon>12.33</lon>
        </geoloc>
      </item>
    </items>
  </event>
</message>
... and so on
        
    

Recipient server is responsible now to filter out and broadcast that messages with events that were request by each user's resource.

3.3 Advertising client's filtering preferences¶

As described at Publish-Subscribe (XEP-0060) [1]'s "Filtered notifications" section, client should add payload's NodeID and "+notify" postfix to tell which types of content it can and want to process.

This document extends this filtering feature to allow clients also select which event types it wants to receive.

To advertise user's preferences it should add a feature in its capabilities that MUST consist of payload's NodeID with appended "+events-" postfix and then append a list of necessary payload types. Here are the rules of generating this list:

• list should contain payload types those can be one of the following: config, delete, retract, sub as described in Publish-Subscribe (XEP-0060) [1];
• order the list ascending;
• concatenate the items through the "-" sign.

For example, the following string will mean that user wants to receive new items, node configuration changes and new subscriptions geolocation events, it should add the following features in its capabilities:

• http://jabber.org/protocol/geoloc+notify
• http://jabber.org/protocol/geoloc+events-config-sub

The recipient's server MUST drop the notifications that are not in the list. New items notifications are implied by the "+notify" filter. If user doesn't specify the "+events" filter then the server SHOULD treat it as absence of any filtering at all.

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1. XEP-0060: Publish-Subscribe <https://xmpp.org/extensions/xep-0060.html>.

2. XEP-0115: Entity Capabilities <https://xmpp.org/extensions/xep-0115.html>.

3. XEP-0277: Microblogging over XMPP <https://xmpp.org/extensions/xep-0277.html>.