Rocket v0.4: Typed URIs, Database Support, Revamped Queries(rocket.rs)

    // Simple with admin user.

    #[get("/admin")]
    fn admin(user: AdminUser) -> String {
        // Request is made as admin user.
        format!("Allowed.")
    }

    #[get("/admin"), rank = 2]
    fn admin(user: User) -> String {
        // Request is made as a normal user.
        format!("Not allowed!")
    }

    #[get("/admin"), rank = 3]
    fn admin(user: AnonymousUser) -> String {
        // Request is made as a anonymous user.
        format!("Please login.")
    }


    // More flexable, with permissions.

    #[get("/article/<id>/edit")]
    fn aritcle_edit(permission: PermissionEditContent, article_id: u64) -> String {
        // Request is made with a user that has the correct permission.
        format!("Allowed.")
    }

    #[get("/article/<id>/edit"), rank = 2]
    fn aritcle_edit(article_id: u64) -> String {
        // Request is made with a user that doesn't have the correct permission.
        format!("Not allowed!")
    }

    // Or in single handler.

    #[get("/article/<id>/edit")]
    fn aritcle_edit(permission: Option<PermissionEditContent>, article_id: u64) -> String {
        if permissions.is_some() {
            format!("Allowed.")
        } else {
            format!("Not allowed!")
        }
    }