# API team ID based sharing

* extents api sharing via team name with team id, so that both ways are supported now
* updates tests

api/models/external_identifier.py

@@ -30,4 +30,22 @@ class ExternalIdentifier(models.Model):
     )
 
     def __str__(self):
-        return f"{self.external_id} -> {self.internal_id}"
+        return f"{self.external_id} -> {self.internal_id}"
+
+    @staticmethod
+    def resolve_external_identifier(external_identifier: str):
+        """ Returns a ExternalIdentifier object, if the given parameter could be resolved as an external identifier.
+
+        Args:
+            external_identifier (str): An external identifier.
+
+        Returns:
+            ExternalIdentifier | None
+        """
+        if external_identifier:
+            try:
+                obj = ExternalIdentifier.objects.get(external_id=external_identifier)
+                return obj
+            except ExternalIdentifier.DoesNotExist:
+                pass
+        return None