fix: tracking: parse rate limited response

Technically NetworkFetch isn't intended for this. /shrug for now

libpaket/src/tracking.rs

@@ -44,7 +44,7 @@ impl crate::WebClient {
         };
 
         let resp = parse_json_response!(res, Response);
-        Ok(resp.into())
+        resp.into()
     }
 
     pub async fn tracking_shipment(
@@ -62,7 +62,7 @@ impl crate::WebClient {
         );
 
         let resp = parse_json_response!(res, Response);
-        Ok(resp.into())
+        resp.into()
     }
 }
 
@@ -228,7 +228,7 @@ struct Sendung {
 #[derive(Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct Response {
-    sendungen: Vec<Sendung>,
+    sendungen: Option<Vec<Sendung>>,
     // TODO: parse RECEIVE_MERGED_SHIPMENTS, what is that?
     //merged_anonymous_shipment_list_ids: Option<Vec<()>>,
     is_rate_limited: bool,
@@ -388,15 +388,19 @@ impl From<Sendung> for Shipment {
     }
 }
 
-impl From<Response> for Vec<Shipment> {
+impl From<Response> for LibraryResult<Vec<Shipment>> {
     fn from(value: Response) -> Self {
-        let mut arr = Vec::new();
+        if value.is_rate_limited {
+            Err(crate::LibraryError::NetworkFetch)
+        } else {
+            let mut arr = Vec::new();
 
-        for item in value.sendungen {
-            arr.push(item.into());
+            for item in value.sendungen.unwrap() {
+                arr.push(item.into());
+            }
+
+            Ok(arr)
         }
-
-        arr
     }
 }