Function string_or_struct

pub fn string_or_struct<'de, T, D>(deserializer: D) -> Result<T, D::Error>
where
    T: Deserialize<'de> + FromStr,
    <T as FromStr>::Err: Error,
    D: Deserializer<'de>,

Deserialize a type T from either a string or struct by forwarding string forms to FromStr.

The use-case for this is to allow specifying key material in ownership configuration files either directly or by filename:

key: {
  Ecdsa: "some/path/to/key.pub.der"
}

key: {
  Ecdsa: {
    x: "...",
    y: "..."
  }
}