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    use std::fmt;

    use actix_web::http::StatusCode;

    /// Bearer authorization error types, described in [RFC 6750].
    ///
    /// [RFC 6750]: https://tools.ietf.org/html/rfc6750#section-3.1
    #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
    pub enum Error {
        /// The request is missing a required parameter, includes an unsupported parameter or parameter
        /// value, repeats the same parameter, uses more than one method for including an access token,
        /// or is otherwise malformed.
        InvalidRequest,

        /// The access token provided is expired, revoked, malformed, or invalid for other reasons.
        InvalidToken,

        /// The request requires higher privileges than provided by the access token.
        InsufficientScope,
    }

    impl Error {
        /// Returns [HTTP status code] suitable for current error type.
        ///
        /// [HTTP status code]: `actix_web::http::StatusCode`
        #[allow(clippy::trivially_copy_pass_by_ref)]
        pub fn status_code(&self) -> StatusCode {
            match self {
                Error::InvalidRequest => StatusCode::BAD_REQUEST,
                Error::InvalidToken => StatusCode::UNAUTHORIZED,
                Error::InsufficientScope => StatusCode::FORBIDDEN,
            }
        }

        #[doc(hidden)]
        #[allow(clippy::trivially_copy_pass_by_ref)]
        pub fn as_str(&self) -> &str {
            match self {
                Error::InvalidRequest => "invalid_request",
                Error::InvalidToken => "invalid_token",
                Error::InsufficientScope => "insufficient_scope",
            }
        }
    }

    impl fmt::Display for Error {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            f.write_str(self.as_str())
        }
    }