The author details a custom implementation for type-safe authentication roles within the Servant Haskell web framework, aiming to integrate seamlessly with existing AuthProtect mechanisms. By defining a CheckRole typeclass and using sum types for roles, the solution allows for flexible permission checks (e.g., hierarchical or set-based) directly in API route definitions.
Background
Servant is a popular composable web framework in Haskell that emphasizes type safety in API definitions. Authentication libraries like servant-auth often require manual handling of permissions, which this post seeks to automate and type-check.
- Source
- Lobsters
- Published
- Jul 21, 2026 at 12:07 AM
- Score
- 5.0 / 10