86 lines
2.4 KiB
Rust
86 lines
2.4 KiB
Rust
/// https://w3c-ccg.github.io/did-method-key/
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use std::fmt;
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use std::str::FromStr;
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use regex::Regex;
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use super::{
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did::DidParseError,
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multibase::{decode_multibase_base58btc, encode_multibase_base58btc},
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};
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const DID_KEY_RE: &str = r"did:key:(?P<key>z[a-km-zA-HJ-NP-Z1-9]+)";
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// https://github.com/multiformats/multicodec
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// 0xed: Ed25519 public key
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// 0x01: integer encoding
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const MULTICODEC_ED25519_PREFIX: [u8; 2] = [0xed, 0x01];
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#[derive(Clone, Debug, PartialEq)]
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pub struct DidKey {
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pub key: Vec<u8>,
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}
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#[derive(thiserror::Error, Debug)]
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#[error("multicodec error")]
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pub struct MulticodecError;
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impl DidKey {
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pub fn key_multibase(&self) -> String {
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encode_multibase_base58btc(&self.key)
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}
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pub fn from_ed25519_key(key: [u8; 32]) -> Self {
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let prefixed_key = [MULTICODEC_ED25519_PREFIX.to_vec(), key.to_vec()].concat();
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Self { key: prefixed_key }
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}
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pub fn try_ed25519_key(&self) -> Result<[u8; 32], MulticodecError> {
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if self.key.len() != 34 {
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return Err(MulticodecError);
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};
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let mut prefix = [0; 2];
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let mut key = [0; 32];
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prefix.copy_from_slice(&self.key[0..2]);
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key.copy_from_slice(&self.key[2..34]);
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if prefix.as_ref() != MULTICODEC_ED25519_PREFIX {
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return Err(MulticodecError);
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};
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Ok(key)
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}
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}
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impl FromStr for DidKey {
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type Err = DidParseError;
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fn from_str(value: &str) -> Result<Self, Self::Err> {
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let did_key_re = Regex::new(DID_KEY_RE).unwrap();
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let caps = did_key_re.captures(value).ok_or(DidParseError)?;
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let key = decode_multibase_base58btc(&caps["key"]).map_err(|_| DidParseError)?;
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let did_key = Self { key };
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Ok(did_key)
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}
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}
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impl fmt::Display for DidKey {
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fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
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let did_str = format!("did:key:{}", self.key_multibase());
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write!(formatter, "{}", did_str)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_did_key_string_conversion() {
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let did_str = "did:key:z6MkhaXgBZDvotDkL5257faiztiGiC2QtKLGpbnnEGta2doK";
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let did_key: DidKey = did_str.parse().unwrap();
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assert_eq!(did_key.key.len(), 34); // Ed25519 public key
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let decoded_key = did_key.try_ed25519_key().unwrap();
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let did_key = DidKey::from_ed25519_key(decoded_key);
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assert_eq!(did_key.to_string(), did_str);
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}
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}
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