2022-11-09 01:51:44 +00:00
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/// 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::did::DidParseError;
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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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#[derive(Clone, Debug, PartialEq)]
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pub struct DidKey {
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2022-11-10 00:11:52 +00:00
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pub key: Vec<u8>,
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}
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#[derive(thiserror::Error, Debug)]
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enum MultibaseError {
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#[error("invalid base string")]
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InvalidBaseString,
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#[error("unknown base")]
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UnknownBase,
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#[error(transparent)]
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DecodeError(#[from] bs58::decode::Error),
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}
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/// Decodes multibase base58 (bitcoin) value
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/// https://github.com/multiformats/multibase
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fn decode_multibase_base58btc(value: &str)
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-> Result<Vec<u8>, MultibaseError>
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{
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let base = value.chars().next()
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.ok_or(MultibaseError::InvalidBaseString)?;
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// z == base58btc
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// https://github.com/multiformats/multibase#multibase-table
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if base.to_string() != "z" {
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return Err(MultibaseError::UnknownBase);
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};
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let encoded_data = &value[base.len_utf8()..];
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let data = bs58::decode(encoded_data)
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.with_alphabet(bs58::Alphabet::BITCOIN)
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.into_vec()?;
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Ok(data)
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}
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fn encode_multibase_base58btc(value: &[u8]) -> String {
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let result = bs58::encode(value)
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.with_alphabet(bs58::Alphabet::BITCOIN)
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.into_string();
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format!("z{}", result)
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2022-11-09 01:51:44 +00:00
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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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2022-11-10 00:11:52 +00:00
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let key = decode_multibase_base58btc(&caps["key"])
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.map_err(|_| DidParseError)?;
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let did_key = Self { key };
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2022-11-09 01:51:44 +00:00
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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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2022-11-10 00:11:52 +00:00
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let encoded_key = encode_multibase_base58btc(&self.key);
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let did_str = format!("did:key:{}", encoded_key);
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2022-11-09 01:51:44 +00:00
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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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2022-11-10 00:11:52 +00:00
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assert_eq!(did_key.key.len(), 34); // Ed25519 public key
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2022-11-09 01:51:44 +00:00
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assert_eq!(did_key.to_string(), did_str);
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}
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}
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