Refer to the exhibit.

```json
{
  "bindings": [
    {
      "role": "roles/storage.objectViewer",
      "members": ["user:alice@example.com"],
      "condition": {
        "title": "restrict_to_uk",
        "expression": "resource.location.type == 'region' && resource.location.startsWith('europe-west')"
      }
    }
  ]
}
```