/// Payload is contained in jwt
pub trait Payload {
    /// get issuer
    fn get_iss(&self) -> Option<String> {
        None
    }

    /// get expiration time
    fn get_exp(&self) -> Option<i64> {
        None
    }

    /// whether this jwt is expired or not
    fn is_expired(&self) -> bool {
        if let Some(exp) = self.get_exp() {
            exp < time::now_utc().to_timespec().sec
        } else {
            true
        }
    }

    /// get not before time
    fn get_nbf(&self) -> Option<i64> {
        None
    }

    /// whether this jwt is "not before" or not
    fn is_not_before(&self) -> bool {
        if let Some(nbf) = self.get_nbf() {
            nbf >= time::now_utc().to_timespec().sec
        } else {
            true
        }
    }
}

#[cfg(test)]
mod tests {
    #[test]
    fn test_expired_payload() {
        use super::Payload;

        struct Expired {};
        impl super::Payload for Expired {
            fn get_exp(&self) -> Option<i64> {
                Some(0) // 1970-01-01T00:00:00
            }
        }
        assert!(Expired {}.is_expired());
    }

    #[test]
    fn test_not_before_payload() {
        use super::Payload;

        struct NotBefore {};
        impl super::Payload for NotBefore {
            fn get_nbf(&self) -> Option<i64> {
                Some(std::i64::MAX)
            }
        }
        assert!(NotBefore {}.is_not_before());
    }
}