brn: Introduce BRN as a class

app/models/onions.py

@@ -1,5 +1,4 @@
-from flask import current_app
-
+from app.brm.brn import BRN
 from app.extensions import db
 from app.models import AbstractConfiguration, AbstractResource
 
@@ -21,5 +20,11 @@ class Eotk(AbstractResource):
     group = db.relationship("Group", back_populates="eotks")
 
     @property
-    def brn(self) -> str:
-        return f"brn:{current_app.config['GLOBAL_NAMESPACE']}:{self.group_id}:eotk:{self.provider}:instance/{self.region}"
+    def brn(self) -> BRN:
+        return BRN(
+            group_id=self.group_id,
+            provider=self.provider,
+            product="eotk",
+            resource_type="instance",
+            resource_id=self.region
+        )