feat(bookmark): streamline bookmark creation and add downloaded book filtering

- Simplified the bookmark creation process by using request data directly in the serializer.
- Introduced a new `perform_create` method to save the user context during bookmark creation.
- Enhanced the book listing functionality to filter books by download status for the current user, using a new query parameter `is_downloaded`.

apps/bookmark/views/bookmark.py

@@ -57,17 +57,15 @@ class AddBookmarkView(CreateAPIView):
             return Response(serializer.data, status=status.HTTP_200_OK)
         
         # Create a new bookmark
-        serializer = self.get_serializer(data={
-            'user': request.user.id,
-            'service': service,
-            'content_id': content_id,
-            'status': True
-        })
+        serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
         self.perform_create(serializer)
         headers = self.get_success_headers(serializer.data)
         return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
     
+    def perform_create(self, serializer):
+        serializer.save(user=self.request.user)
+
 
 class RemoveBookmarkView(DestroyAPIView):
     """

apps/library/doc.py

@@ -41,6 +41,14 @@ is_bookmark_param = openapi.Parameter(
     required=False
 )
 
+is_downloaded_param = openapi.Parameter(
+    'is_downloaded',
+    openapi.IN_QUERY,
+    description="Filter books that are downloaded by the current user (set to 'true' to enable)",
+    type=openapi.TYPE_BOOLEAN,
+    required=False
+)
+
 search_param = openapi.Parameter(
     'search',
     openapi.IN_QUERY,
@@ -181,12 +189,13 @@ book_list_swagger = swagger_auto_schema(
     - Middle section collection using the query parameter 'middle'
     - Bottom section collection using the query parameter 'bottom'
     - Bookmarked books using the query parameter 'is_bookmark=true'
+    - Downloaded books using the query parameter 'is_downloaded=true'
 
     You can also search for books by title, summary, or author using the query parameter 'search'.
     """,
     operation_summary="List Books",
     tags=["Library"],
-    manual_parameters=[collection_id_param, middle_param, bottom_param, is_bookmark_param, search_param],
+    manual_parameters=[collection_id_param, middle_param, bottom_param, is_bookmark_param, is_downloaded_param, search_param],
     responses={
         200: books_response,
         401: "Authentication credentials were not provided or are invalid.",

apps/library/views.py

@@ -137,6 +137,18 @@ class BookListView(ListAPIView):
             # Filter books by these IDs
             queryset = queryset.filter(id__in=bookmarked_ids)
 
+        # Filter by downloaded books if requested
+        is_downloaded = self.request.query_params.get('is_downloaded', '').lower()
+        if is_downloaded == 'true':
+            # Get all downloaded book IDs for the current user
+            downloaded_ids = BookDownload.objects.filter(
+                user=self.request.user,
+                status=True
+            ).values_list('book_id', flat=True)
+            
+            # Filter books by these IDs
+            queryset = queryset.filter(id__in=downloaded_ids)
+
         return queryset.order_by('-pin', '-created_at')