Flask Authentication and Authorization

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How Can You Implement Authentication and Authorization in Flask?

When building web applications, ensuring secure access to resources is critical. In Flask, two important concepts—authentication and authorization—help achieve this. But what’s the difference? Authentication verifies who the user is, while authorization defines what the user can access after logging in.

Flask provides a simple yet powerful way to implement both. Authentication can be handled using libraries like Flask-Login, which manages user sessions, login, and logout. With this, you can store user credentials securely (usually hashed passwords in a database) and validate them during login. For added security, you can integrate Flask-Bcrypt to hash passwords and Flask-WTF for safe form handling.

Authorization, on the other hand, ensures users access only what they’re permitted to. You can implement role-based access control (RBAC) by assigning roles such as admin, editor, or user, then restricting views with decorators like @login_required or custom role checks.

For example, an admin dashboard could be accessible only to users with the "admin" role. This way, authentication ensures valid identity, while authorization controls permissions.

In real-world applications, integrating JWT (JSON Web Tokens) or OAuth2 adds an extra layer, especially for APIs and distributed systems. With Flask’s flexibility and extensions, you can build secure applications where user identity and permissions are tightly controlled. 

Read More

Flask Blueprints for App Structuring

Connecting Flask to a Database

Flask Templates with Jinja2

Flask Routing Explained

Creating Your First Flask App

Introduction to Flask for Web Development

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