Implementing Role-Based Access Control in mediTurn

Managing user permissions should not be an afterthought. In our recent work on the mediTurn project, we focused on establishing a robust foundation for user authentication and authorization by introducing a centralized User entity with structured role definitions.

Defining the User Domain

To ensure scalability, we decided to leverage Java's enum types to define user roles. This approach provides type safety and makes our permission logic significantly easier to maintain than checking against raw string values.

Here is the implementation of our role structure:

public enum Role {
    ADMIN, 
    DOCTOR, 
    PATIENT
}

public class Usuario {
    private String username;
    private Role role;

    public Usuario(String username, Role role) {
        this.username = username;
        this.role = role;
    }
}

By encapsulating the role within the Usuario class, we ensure that every user instance carries its access level inherently, allowing our service layer to perform authorization checks with minimal overhead.

Why Type-Safe Roles Matter

Using an enum instead of arbitrary strings prevents typos and ensures that the application only recognizes valid access levels. During our development, this forced us to define the specific capabilities of each role early on, rather than letting permission logic sprawl across the codebase.

Actionable Takeaway

Start your domain modeling by defining your roles as strongly-typed enums. This keeps your authorization logic centralized and prevents the "magic string" anti-pattern that often plagues growing applications.

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