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use jsonwebtoken::decode_header;

#[derive(Debug, thiserror::Error)]
pub enum TokenError {
    #[error("token does not seem to be a valid JWT token: {0}")]
    MalformedToken(#[source] jsonwebtoken::errors::Error),
}

/// A JWT token that is used to authenticate the client.
#[derive(Debug, Clone)]
#[repr(transparent)]
pub struct Jwt(pub(crate) String);

impl TryFrom<String> for Jwt {
    type Error = TokenError;

    fn try_from(token: String) -> Result<Self, Self::Error> {
        // We first check if the general structure of the token is correct.
        let _ = decode_header(&token).map_err(Self::Error::MalformedToken)?;
        Ok(Self(token))
    }
}

impl std::fmt::Display for Jwt {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}