mhoppa commented on a change in pull request #4059: return 403 when 
unauthorized user assigns/deletes ds required capability
URL: https://github.com/apache/trafficcontrol/pull/4059#discussion_r341685615
 
 

 ##########
 File path: 
traffic_ops/traffic_ops_golang/deliveryservice/deliveryservices_required_capabilities.go
 ##########
 @@ -219,22 +219,51 @@ func (rc *RequiredCapability) getCapabilities(tenantIDs 
[]int) ([]tc.DeliverySer
 // Delete implements the api.CRUDer interface.
 func (rc *RequiredCapability) Delete() (error, error, int) {
        authorized, err := rc.isTenantAuthorized()
-       if err != nil {
-               return nil, errors.New("checking tenant: " + err.Error()), 
http.StatusInternalServerError
-       } else if !authorized {
+       if !authorized {
                return errors.New("not authorized on this tenant"), nil, 
http.StatusForbidden
+       } else if err != nil {
+               return nil, fmt.Errorf("checking authorization for existing DS 
ID: %s" + err.Error()), http.StatusInternalServerError
+       }
+
+       // Check if the Delivery Service is associated with the Required 
Capability
+       statusCode, err := rc.exists()
+       if err != nil {
+               return err, nil, statusCode
        }
 
        return api.GenericDelete(rc)
 }
 
+// exists checks to see if a required capability is assigned to a delivery 
service
+func (rc *RequiredCapability) exists() (int, error) {
 
 Review comment:
   Is this not caught by 
https://github.com/apache/trafficcontrol/blob/master/traffic_ops/traffic_ops_golang/api/generic_crud.go#L169?
 is this just to clean up the error message? 

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