chore: refactor account ID (#371)

* chore: refactor account ID

* chore: prefer match

* chore: improve understanding of panic

src/model/types/account_id/caip10.rs

@@ -0,0 +1,58 @@
+use {
+    super::eip155::{validate_eip155, Eip155Error, NAMESPACE_EIP155},
+    once_cell::sync::Lazy,
+    regex::Regex,
+    thiserror::Error,
+};
+
+#[derive(Debug, PartialEq, Eq, Error)]
+pub enum Caip10Error {
+    #[error("Account ID is is not a valid CAIP-10 account ID")]
+    Invalid,
+
+    #[error("Account ID uses an unsupported namespace")]
+    UnsupportedNamespace,
+
+    #[error("Account ID is eip155 namespace but: {0}")]
+    Eip155(#[from] Eip155Error),
+}
+
+// https://github.com/ChainAgnostic/CAIPs/blob/main/CAIPs/caip-10.md#syntax
+static PATTERN: Lazy<Regex> = Lazy::new(|| {
+    Regex::new(r"^([-a-z0-9]{3,8}):([-_a-zA-Z0-9]{1,32}):([-.%a-zA-Z0-9]{1,128})$")
+        .expect("Safe unwrap: panics should be caught by test cases")
+});
+
+pub fn validate_caip_10(s: &str) -> Result<(), Caip10Error> {
+    if let Some(caps) = PATTERN.captures(s) {
+        let (_, [namespace, reference, address]) = caps.extract();
+
+        match namespace {
+            NAMESPACE_EIP155 => validate_eip155(reference, address).map_err(Into::into),
+            _ => Err(Caip10Error::UnsupportedNamespace),
+        }
+    } else {
+        Err(Caip10Error::Invalid)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test() {
+        assert!(validate_caip_10("eip155:1:0x9AfEaC202C837df470b5A145e0EfD6a574B21029").is_ok());
+        assert_eq!(validate_caip_10("eip155:111111111111111111111111111111111:0x9AfEaC202C837df470b5A145e0EfD6a574B21029"), Err(Caip10Error::Invalid));
+        assert_eq!(validate_caip_10("junk"), Err(Caip10Error::Invalid));
+    }
+
+    #[test]
+    fn account_id_valid_namespaces() {
+        assert!(validate_caip_10("eip155:1:0x9AfEaC202C837df470b5A145e0EfD6a574B21029").is_ok());
+        assert_eq!(
+            validate_caip_10("junk:1:1"),
+            Err(Caip10Error::UnsupportedNamespace)
+        );
+    }
+}