SDK: fix string field serialization for multipart/form-data requests

CHANGELOG.md

@@ -131,9 +131,14 @@ non-ascii paths while adding files from "Connected file share" (issue #4428)
 - Missing source tag in project annotations (<https://github.com/opencv/cvat/pull/5408>)
 - Creating a task with a Git repository via the SDK
  (<https://github.com/opencv/cvat/issues/4365>)
+- Queries via the low-level API using the `multipart/form-data` Content-Type with string fields
+ (<https://github.com/opencv/cvat/pull/5479>)
+
+### Security
 - `Project.import_dataset` not waiting for completion correctly
  (<https://github.com/opencv/cvat/pull/5459>)
 
+
 ## \[2.2.0] - 2022-09-12
 ### Added
 - Added ability to delete frames from a job based on (<https://github.com/openvinotoolkit/cvat/pull/4194>)

cvat-sdk/gen/templates/openapi-generator/api_client.mustache

@@ -126,8 +126,8 @@ class ApiClient(object):
  self.default_headers['User-Agent'] = value
 
  def _serialize_post_parameter(self, obj):
- if isinstance(obj, (str, int, float, none_type, bool)):
- return ('', json.dumps(obj), 'application/json')
+ if isinstance(obj, (str, int, float, bool)):
+ return str(obj)
  elif isinstance(obj, io.IOBase):
  return self._serialize_file(obj)
  raise ApiValueError(

tests/python/rest_api/test_tasks.py

@@ -491,6 +491,40 @@ def test_can_create_task_with_defined_start_and_stop_frames(self):
  (task, _) = api_client.tasks_api.retrieve(task_id)
  assert task.size == 4
 
+ def test_can_create_task_with_sorting_method(self):
+ task_spec = {
+ "name": f"test {self._USERNAME} to create a task with a custom sorting method",
+ "labels": [
+ {
+ "name": "car",
+ "color": "#ff00ff",
+ "attributes": [],
+ }
+ ],
+ }
+
+ image_files = generate_image_files(15)
+
+ task_data = {
+ "client_files": image_files[5:] + image_files[:5], # perturb the order
+ "image_quality": 70,
+ "sorting_method": "natural",
+ }
+
+ # Besides testing that the sorting method is applied, this also checks for
+ # regressions of <https://github.com/opencv/cvat/issues/4962>.
+ task_id = self._test_create_task(
+ self._USERNAME, task_spec, task_data, content_type="multipart/form-data"
+ )
+
+ # check that the frames were sorted again
+ with make_api_client(self._USERNAME) as api_client:
+ data_meta, _ = api_client.tasks_api.retrieve_data_meta(task_id)
+
+ # generate_image_files produces files that are already naturally sorted
+ for image_file, frame in zip(image_files, data_meta.frames):
+ assert image_file.name == frame.name
+
  def test_can_get_annotations_from_new_task_with_skeletons(self):
  spec = {
  "name": f"test admin1 to create a task with skeleton",