fix qrcode zip downloads

app/services/qrcode_batch_tasks.py

@@ -87,6 +87,21 @@ def _public_base_url() -> str:
     return settings.public_base_url.rstrip("/") or "http://127.0.0.1:8000"
 
 
+def qrcode_batch_zip_path(task: DeviceQrBatchTask) -> Path:
+    return settings.upload_path / "qrcode_zips" / task.file_name
+
+
+def qrcode_batch_zip_exists(task: DeviceQrBatchTask) -> bool:
+    return bool(task.file_name and qrcode_batch_zip_path(task).is_file())
+
+
+def _task_download_url(task: DeviceQrBatchTask, public_base_url: str) -> str:
+    return (
+        f"{public_base_url.rstrip('/')}/api/devices/molds/qrcode/batch/tasks/"
+        f"{task.id}/download"
+    )
+
+
 def _task_file_name(items: list[dict]) -> str:
     fingerprint = hashlib.sha1(
         "|".join(
@@ -153,9 +168,9 @@ def qrcode_batch_task_out(task: DeviceQrBatchTask, public_base_url: str | None =
         progress_percent = 0.0
     else:
         progress_percent = round(min(100, completed_count / item_count * 100), 1)
-    zip_url = task.zip_url
-    if public_base_url and task.file_name:
-        zip_url = f"{public_base_url.rstrip('/')}/uploads/qrcode_zips/{quote(task.file_name, safe='')}"
+    zip_url = None
+    if task.status == QRCODE_TASK_STATUS_COMPLETED and qrcode_batch_zip_exists(task):
+        zip_url = _task_download_url(task, public_base_url) if public_base_url else task.zip_url
     return DeviceQrBatchTaskOut(
         id=task.id,
         file_name=task.file_name,