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use anyhow::{anyhow, Result};
use lazy_static::lazy_static;
use regex::Regex;
use std::fmt;
use std::str::FromStr;
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum DidOrHost {
Did(String, String),
Host(String),
}
impl FromStr for DidOrHost {
type Err = anyhow::Error;
/// DID syntax is specified in: <https://w3c.github.io/did-core/#did-syntax>
///
/// Lazy partial hostname regex, isn't very correct.
fn from_str(s: &str) -> Result<Self, Self::Err> {
lazy_static! {
static ref DID_RE: Regex =
Regex::new(r"^did:([a-z]{1,64}):([a-zA-Z0-9\-.]{1,1024})$").unwrap();
}
lazy_static! {
static ref HOSTNAME_RE: Regex =
Regex::new(r"^[A-Za-z][A-Za-z0-9-]*(\.[A-Za-z][A-Za-z0-9-]*)+$").unwrap();
}
if let Some(caps) = DID_RE.captures(s) {
Ok(Self::Did(caps[1].to_string(), caps[2].to_string()))
} else if HOSTNAME_RE.is_match(s) {
Ok(Self::Host(s.to_string()))
} else {
Err(anyhow!("does not match as a DID or hostname: {}", s))
}
}
}
impl fmt::Display for DidOrHost {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Host(v) => write!(f, "{}", v),
Self::Did(m, v) => write!(f, "did:{}:{}", m, v),
}
}
}
#[test]
fn test_didorhost() {
assert_eq!(
DidOrHost::from_str("hyde.test").unwrap(),
DidOrHost::Host("hyde.test".to_string())
);
assert_eq!(
DidOrHost::from_str("did:method:blah").unwrap(),
DidOrHost::Did("method".to_string(), "blah".to_string())
);
assert!(DidOrHost::from_str("barestring").is_err());
assert!(DidOrHost::from_str("did:partial:").is_err());
assert!(DidOrHost::from_str("").is_err());
assert!(DidOrHost::from_str(" ").is_err());
assert!(DidOrHost::from_str("1234").is_err());
assert!(DidOrHost::from_str("mutli.part.domain").is_ok());
assert!(DidOrHost::from_str("did:is:weird").is_ok());
assert!(DidOrHost::from_str("did:plc:bv6ggog3tya2z3vxsub7hnal").is_ok());
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct AtUri {
pub repository: DidOrHost,
pub collection: Option<String>,
pub record: Option<String>,
pub fragment: Option<String>,
}
impl FromStr for AtUri {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
lazy_static! {
static ref ATURI_RE: Regex = Regex::new(r"^at://([a-zA-Z0-9:_\.-]+)(/([a-zA-Z0-9\.]+))?(/([a-zA-Z0-9\.-]+))?(#([a-zA-Z0-9/-]+))?$").unwrap();
}
if let Some(caps) = ATURI_RE.captures(s) {
let uri = AtUri {
repository: DidOrHost::from_str(&caps[1])?,
collection: caps.get(3).map(|v| v.as_str().to_string()),
record: caps.get(5).map(|v| v.as_str().to_string()),
fragment: caps.get(7).map(|v| v.as_str().to_string()),
};
Ok(uri)
} else {
Err(anyhow!("couldn't parse as an at:// URI: {}", s))
}
}
}
impl fmt::Display for AtUri {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "at://{}", self.repository)?;
if let Some(ref c) = self.collection {
write!(f, "/{}", c)?;
};
if let Some(ref r) = self.record {
write!(f, "/{}", r)?;
};
if let Some(ref v) = self.fragment {
write!(f, "#{}", v)?;
};
Ok(())
}
}
#[test]
fn test_aturi() {
assert!(AtUri::from_str("at://bob.com").is_ok());
assert!(AtUri::from_str("at://did:plc:bv6ggog3tya2z3vxsub7hnal").is_ok());
assert!(AtUri::from_str("at://bob.com/io.example.song").is_ok());
assert!(AtUri::from_str("at://bob.com/io.example.song/3yI5-c1z-cc2p-1a").is_ok());
assert!(AtUri::from_str("at://bob.com/io.example.song/3yI5-c1z-cc2p-1a#/title").is_ok());
assert!(
AtUri::from_str("at://did:plc:ltk4reuh7rkoy2frnueetpb5/app.bsky.follow/3jg23pbmlhc2a")
.is_ok()
);
let uri = AtUri {
repository: DidOrHost::Did("some".to_string(), "thing".to_string()),
collection: Some("com.atproto.record".to_string()),
record: Some("asdf-123".to_string()),
fragment: Some("/path".to_string()),
};
assert_eq!(
"at://did:some:thing/com.atproto.record/asdf-123#/path",
uri.to_string()
);
println!("{:?}", AtUri::from_str(&uri.to_string()));
assert!(AtUri::from_str(&uri.to_string()).is_ok());
let uri = AtUri::from_str("at://bob.com/io.example.song/3yI5-c1z-cc2p-1a#/title").unwrap();
assert_eq!(uri.repository, DidOrHost::Host("bob.com".to_string()));
assert_eq!(uri.collection, Some("io.example.song".to_string()));
assert_eq!(uri.record, Some("3yI5-c1z-cc2p-1a".to_string()));
assert_eq!(uri.fragment, Some("/title".to_string()));
}
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