dav: Make reusable for other projects

crates/store/Cargo.toml

@@ -30,6 +30,7 @@ tokio.workspace = true
 rand.workspace = true
 uuid.workspace = true
 clap.workspace = true
+rustical_dav.workspace = true
 
 [dev-dependencies]
 rstest = { workspace = true }

crates/store/src/auth/user.rs

@@ -81,6 +81,12 @@ impl User {
     }
 }
 
+impl rustical_dav::Principal for User {
+    fn get_id(&self) -> &str {
+        &self.id
+    }
+}
+
 #[derive(Clone, Debug, Display)]
 pub struct UnauthorizedError;