Solution: Enforce Role-Based Access on Service Methods

Understand how to implement role-based access control on service methods by using the Proxy pattern in Node.js. This lesson teaches you to wrap an existing service with a Proxy that intercepts method calls, enforcing permissions for admin-only actions while allowing unrestricted access to other methods, improving security without altering the original service code.

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Solution explanation
Revisit the problem statement

Solution explanation

Lines 2–10: We define the UserService class, which exposes two methods: getUser() for general data access, and deleteUser() for administrative actions.
- This represents a real backend service with both safe and restricted operations.
- Our goal is to protect certain methods without editing this class.
Lines 13–33: The createSecureService() function creates a Proxy that enforces method-level access control.
- The variable restrictedMethods defines which methods require admin privileges. ...

1.Introduction to Node.js Patterns

2.Factory Pattern: Generate Config-Driven Services Dynamically

3.Builder Pattern: Assemble Complex Objects with Fluent APIs

4.Decorator Pattern: Extend Behavior Without Modifying Core Logic

5.Adapter Pattern: Standardize Interface Across Dependencies

6.Proxy Pattern: Intercept and Control Access Transparently

7.Strategy Pattern: Swap Algorithms Based on Context

8.Wrapping Up

Solution: Enforce Role-Based Access on Service Methods

Solution explanation