fedimovies/src/identity/did.rs

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/// https://www.w3.org/TR/did-core/
use std::fmt;
use std::str::FromStr;
use regex::Regex;
use serde::{
Deserialize, Deserializer, Serialize, Serializer,
de::Error as DeserializerError,
};
use super::did_pkh::DidPkh;
const DID_RE: &str = r"did:(?P<method>\w+):.+";
#[derive(Clone, Debug, PartialEq)]
pub enum Did {
Pkh(DidPkh),
}
#[derive(thiserror::Error, Debug)]
#[error("DID parse error")]
pub struct DidParseError;
impl FromStr for Did {
type Err = DidParseError;
fn from_str(value: &str) -> Result<Self, Self::Err> {
let did_re = Regex::new(DID_RE).unwrap();
let caps = did_re.captures(value).ok_or(DidParseError)?;
let did = match &caps["method"] {
"pkh" => {
let did_pkh = DidPkh::from_str(value)?;
Self::Pkh(did_pkh)
},
_ => return Err(DidParseError),
};
Ok(did)
}
}
impl fmt::Display for Did {
fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
let did_str = match self {
Self::Pkh(did_pkh) => did_pkh.to_string(),
};
write!(formatter, "{}", did_str)
}
}
impl<'de> Deserialize<'de> for Did {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
let did_str: String = Deserialize::deserialize(deserializer)?;
did_str.parse().map_err(DeserializerError::custom)
}
}
impl Serialize for Did {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer
{
let did_str = self.to_string();
serializer.serialize_str(&did_str)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_did_string_conversion() {
let did_str = "did:pkh:eip155:1:0xb9c5714089478a327f09197987f16f9e5d936e8a";
let did: Did = did_str.parse().unwrap();
assert!(matches!(did, Did::Pkh(_)));
assert_eq!(did.to_string(), did_str);
}
}