How can I handle authentication and authorization?

Deepkit provides various options for handling authentication and authorization in your application. You can use middleware, decorators, and role-based access control (RBAC) to manage access to your endpoints. Here are a few options:

• Use middleware to authenticate and authorize requests at a global level or on specific routes.
• Use decorators to restrict access to specific controller actions based on roles or other criteria.
• Implement a custom authentication system using Deepkit's dependency injection and ORM capabilities.
• Use third-party authentication providers, such as OAuth or JWT, and integrate them into your application using Deepkit Framework.

Here's an example of using middleware for authentication:

import { HttpMiddleware, HttpRequest, HttpResponse, HttpUnauthorizedError } from '@deepkit/http';

class AuthMiddleware implements HttpMiddleware {
    constructor(private database: Database) {
    }

    async execute(request: HttpRequest, response: HttpResponse, next: (err?: any) => void) {
        // Check if the request is authenticated and has the necessary permissions
        const authorized = await checkAuthorization(request);
        if (!authorized) {
            throw new HttpUnauthorizedError();
        }

        // Otherwise, continue with the request
        next();
    }
}

class UserController {
    @http.GET('/users')
    @http.middleware(AuthMiddleware)
    listUsers() {
        // Return a list of users
    }
}

In this example, the AuthMiddleware is used to check if the request is authenticated and authorized to access the listUsers action. If not, a 401 Unauthorized response is returned.