What is your experience in implementing and configuring authentication and authorization systems?

In my Go projects, I have implemented authentication and authorization systems using JWT (JSON Web Tokens) and OAuth2. The process typically includes:

• Creating endpoints for registration and login, where the user receives a token after successful authentication.
• Using middleware to verify the validity of the token on protected routes.
• Setting up roles and access rights to restrict user actions based on their role.

An example of simple middleware for JWT verification:

func AuthMiddleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        tokenString := r.Header.Get("Authorization")
        if tokenString == "" {
            http.Error(w, "Unauthorized", http.StatusUnauthorized)
            return
        }
        // Token validation occurs here
        // If valid, call the next handler
        next.ServeHTTP(w, r)
    })
}

For more complex scenarios, I used libraries such as golang.org/x/oauth2 for integration with external providers.