Add endpoint to get current user

src/api/auth.rs

@@ -80,3 +80,9 @@ pub async fn logout() -> Result<()> {
     }
     .err_context("Error logging out")
 }
+
+/// Retrieve the currently logged-in user, or `None` if unauthenticated
+#[get("/api/v1/auth/user", auth: Extension<AuthSession>)]
+pub async fn get_user() -> Result<Option<User>> {
+    Ok(auth.user.clone().map(Into::into))
+}