Refactor a security code example to make it easier to understand

security/custom_provider.rst

@@ -133,21 +133,7 @@ Here's an example of how this might look::
     {
         public function loadUserByUsername($username)
         {
-            // make a call to your webservice here
-            $userData = ...
-            // pretend it returns an array on success, false if there is no user
-
-            if ($userData) {
-                $password = '...';
-
-                // ...
-
-                return new WebserviceUser($username, $password, $salt, $roles);
-            }
-
-            throw new UsernameNotFoundException(
-                sprintf('Username "%s" does not exist.', $username)
-            );
+            return $this->fetchUser($username);
         }
 
         public function refreshUser(UserInterface $user)
@@ -158,13 +144,32 @@ Here's an example of how this might look::
                 );
             }
 
-            return $this->loadUserByUsername($user->getUsername());
+            return $this->fetchUser($username);
         }
 
         public function supportsClass($class)
         {
             return WebserviceUser::class === $class;
         }
+
+        private function fetchUser($username)
+        {
+            // make a call to your webservice here
+            $userData = ...
+            // pretend it returns an array on success, false if there is no user
+
+            if ($userData) {
+                $password = '...';
+
+                // ...
+
+                return new WebserviceUser($username, $password, $salt, $roles);
+            }
+
+            throw new UsernameNotFoundException(
+                sprintf('Username "%s" does not exist.', $username)
+            );
+        }
     }
 
 Create a Service for the User Provider