use std::fmt;
use native_tls;

/// Represent an X509 certificate.
pub struct Certificate(native_tls::Certificate);

impl Certificate {
    /// Create a `Certificate` from a binary DER encoded certificate
    ///
    /// # Examples
    ///
    /// ```
    /// # use std::fs::File;
    /// # use std::io::Read;
    /// # fn cert() -> Result<(), Box<std::error::Error>> {
    /// let mut buf = Vec::new();
    /// File::open("my_cert.der")?
    ///     .read_to_end(&mut buf)?;
    /// let cert = reqwest::Certificate::from_der(&buf)?;
    /// # drop(cert);
    /// # Ok(())
    /// # }
    /// ```
    ///
    /// # Errors
    ///
    /// If the provided buffer is not valid DER, an error will be returned.
    pub fn from_der(der: &[u8]) -> ::Result<Certificate> {
        let inner = try_!(native_tls::Certificate::from_der(der));
        Ok(Certificate(inner))
    }
}

impl fmt::Debug for Certificate {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("Certificate")
            .finish()
    }
}

// pub(crate)

pub fn cert(cert: Certificate) -> native_tls::Certificate {
    cert.0
}