Extract, (de-)serialize and format id

cove-core/Cargo.toml

@@ -4,4 +4,6 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+hex = { version = "0.4.3", features = ["serde"] }
 serde = { version = "1.0.136", features = ["derive"] }
+sha2 = "0.10.1"

cove-core/src/id.rs

@@ -0,0 +1,24 @@
+use std::fmt;
+
+use hex::ToHex;
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+
+// TODO Use base64 representation instead
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct Id(#[serde(with = "hex")] [u8; 32]);
+
+impl Id {
+    pub fn of(str: &str) -> Self {
+        let mut hasher = Sha256::new();
+        hasher.update(str);
+        Self(hasher.finalize().into())
+    }
+}
+
+impl fmt::Display for Id {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0.encode_hex::<String>())
+    }
+}

cove-core/src/lib.rs

@@ -1,12 +1,11 @@
+mod id;
 mod macros;
 
 use serde::{Deserialize, Serialize};
 
+pub use self::id::*;
 use self::macros::packets;
 
-#[derive(Debug, Deserialize, Serialize)]
-pub struct Id(pub u128);
-
 #[derive(Debug, Deserialize, Serialize)]
 pub struct HelloCmd {
     pub id: Id,