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cmt: Write down how bans (and other things) might propagate

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@ -140,6 +140,77 @@ have to.
</iq> </iq>
``` ```
## State Synchronization (Maybe new XEP?)
There may be some state that should be synchronized across different channels, like ban lists, ACLs, hats, and so on. To accomplish this, XEPs may define
new [PubSub](#) nodes that supporting channels within a community should subscribe to. Upon receiving a [PubSub](#) notification, the channels should
react appropriately in regard to the payload.
Care must be taken when storing bare or full JIDs in these [PubSub](#) nodes as to not leaking them. Thus, The recommendations of
[Persistent Storage of Private Data via PubSub](https://xmpp.org/extensions/xep-0223.html) apply.
### Linking
Each channel must be configured to listen to [PubSub](#) events for every bit of synchronized state it cares about. The actual mechanism for it is out of scope,
but for MUC, it may include a field in the configuration data form that refers to the community's JID.
Example:
```xml
<iq from='crone1@shakespeare.lit/desktop'
id='create2'
to='coven@chat.shakespeare.lit'
type='set'>
<query xmlns='http://jabber.org/protocol/muc#owner'>
<x xmlns='jabber:x:data' type='submit'>
<field var='FORM_TYPE'>
<value>http://jabber.org/protocol/muc#roomconfig</value>
</field>
<field var='muc#community_link'>
<value>community.example.org</value>
</field>
</x>
</query>
</iq>
```
### Banning
Every channel inside a space that supports banning users, should be configured to subscribe to the `proto:urn:xmpp:community:0:ban` [PubSub](#) node. When a JID is put there,
the supporting channels will be notified of the new ban and SHOULD apply it locally. This node MUST be configured with an access model of whitelist such that only administrators
can see the bare JIDs of banned users.
Banning a JID:
```xml
<iq type="set" to="community.example.org">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<publish node="proto:urn:xmpp:community:0:ban">
<item id="malicious-user@example.org" />
</publish>
</pubsub>
</iq>
```
### Power Levels
Every channel inside a space that supports power levels, like "Moderator", "Admin", and so on, should subscribe to the `proto:urn:xmpp:community:0:power` [PubSub](#) node. Each item in it
describes a bare JID and its power level. When a notification is received, supporting channels SHOULD keep their internal power levels in sync with the payload.
Making a JID an administrator:
```xml
<iq type="set" to="community.example.org">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<publish node="proto:urn:xmpp:community:0:power">
<item id="admin@example.org">
<power xmlns="proto:urn:xmpp:community:0:power" level="admin" />
</item>
</publish>
</pubsub>
</iq>
```
# Notes # Notes
- Using just this XEP, one can implement Gajim-like workspaces: Create a private community on your own bare JID and create a channel group per workspace. - Using just this XEP, one can implement Gajim-like workspaces: Create a private community on your own bare JID and create a channel group per workspace.