Authenticate Users with Configurable Login and Tokens
Explore how to implement flexible user authentication by applying the Strategy Pattern to manage multiple login methods and token generations. You will learn to structure authentication strategies and orchestrate them within a controller, enhancing scalability and maintainability in Node.js applications.
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Problem statement
You’re designing a new authentication system for your platform. It must support multiple login methods (password, OTP, Google) and multiple token types (session, JWT, encrypted).
Authentication systems often combine login and token generation logic in a single file, making them difficult to extend and maintain as new methods are introduced. A typical implementation might look like this:
if (method === 'password') verifyPassword();else if (method === 'otp') verifyOtp();else if (method === 'google') verifyGoogle();if (tokenType === 'jwt') issueJwt();else if (tokenType === 'session') issueSession();
The design doesn’t scale—every time you add or modify a login or token type, you have to change core logic.
You’ve decided to use the Strategy Pattern twice: ...