use data_encoding::BASE64; use thiserror::Error; // FUTUREWORK: make generic #[derive(PartialEq, Eq, Hash, Debug)] pub struct B3Digest(Vec); // TODO: allow converting these errors to crate::Error #[derive(Error, Debug)] pub enum Error { #[error("invalid digest length: {0}")] InvalidDigestLen(usize), } impl B3Digest { // constructs a [B3Digest] from a [Vec]. // Returns an error if the digest has the wrong length. pub fn from_vec(value: Vec) -> Result { if value.len() != 32 { Err(Error::InvalidDigestLen(value.len())) } else { Ok(Self(Vec::from(value))) } } // returns a copy of the inner [Vec]. pub fn to_vec(&self) -> Vec { self.0.to_vec() } } impl From<&[u8; 32]> for B3Digest { fn from(value: &[u8; 32]) -> Self { Self(value.to_vec()) } } impl Clone for B3Digest { fn clone(&self) -> Self { Self(self.0.to_owned()) } } impl std::fmt::Display for B3Digest { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { write!(f, "b3:{}", BASE64.encode(self.0.as_slice())) } }