plugin XEP-0060: handle purge notifications

sat/plugins/plugin_xep_0060.py

@@ -1529,6 +1529,19 @@ class SatPubSubClient(rsm.PubSubClient):
                 event.sender.full(), event.nodeIdentifier, C.PS_DELETE, [], client.profile
             )
 
+    def purgeReceived(self, event):
+        log.debug(("Publish node purged"))
+        for callback in self._getNodeCallbacks(event.nodeIdentifier, C.PS_PURGE):
+            d = utils.asDeferred(callback, self.parent, event)
+            d.addErrback(lambda f: log.error(
+                f"Error while running purge event callback {callback}: {f}"
+            ))
+        client = self.parent
+        if (event.sender, event.nodeIdentifier) in client.pubsub_watching:
+            self.host.bridge.psEventRaw(
+                event.sender.full(), event.nodeIdentifier, C.PS_PURGE, [], client.profile
+            )
+
     def subscriptions(self, service, nodeIdentifier, sender=None):
         """Return the list of subscriptions to the given service and node.