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use std::fmt::{self, Display};
use data_encoding::BASE64;
#[derive(Debug)]
pub struct Signature<'a> {
name: &'a str,
bytes: [u8; 64],
}
impl<'a> Signature<'a> {
pub fn parse(input: &'a str) -> Result<Signature<'a>, SignatureError> {
let (name, bytes64) = input
.split_once(':')
.ok_or(SignatureError::MissingSeparator)?;
let mut buf = [0; 66];
let mut bytes = [0; 64];
match BASE64.decode_mut(bytes64.as_bytes(), &mut buf) {
Ok(64) => {
bytes.copy_from_slice(&buf[..64]);
}
Ok(n) => return Err(SignatureError::InvalidSignatureLen(n)),
// keeping DecodePartial gets annoying lifetime-wise
Err(_) => return Err(SignatureError::DecodeError(input.to_string())),
}
Ok(Signature { name, bytes })
}
pub fn name(&self) -> &'a str {
self.name
}
pub fn bytes(&self) -> &[u8; 64] {
&self.bytes
}
}
#[derive(Debug, thiserror::Error)]
pub enum SignatureError {
#[error("Missing separator")]
MissingSeparator,
#[error("Invalid signature len: {0}")]
InvalidSignatureLen(usize),
#[error("Unable to base64-decode signature: {0}")]
DecodeError(String),
}
impl Display for Signature<'_> {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
write!(w, "{}:{}", self.name, BASE64.encode(&self.bytes))
}
}
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