Add auth

backend/sync_server/src/server/auth.rs

@@ -0,0 +1,14 @@
+use crate::{
+    app_state::AppState,
+    config::user_config::User,
+    errors::{unauthorized_error, SyncServerError},
+};
+
+pub fn auth(app_state: &AppState, token: &str) -> Result<User, SyncServerError> {
+    app_state
+        .config
+        .users
+        .get_user(token)
+        .cloned()
+        .ok_or_else(|| unauthorized_error(anyhow::anyhow!("Invalid token")))
+}