# Refactors API geometry processing

* refactors API geometry processing to use GeoJsonValidator and GeometryProcessor just like SimpleGeomForm
* moves cast_to_multipolygon, cast_to_rlp_srid, flatten_geom_to_2D, is_valid_4326 and is_area_valid into GeometryProcessor
* adds changeable SRID to GeoJsonValidator constructor
* updates test data
* updates test cases

api/utils/serializer/serializer.py

@@ -17,6 +17,8 @@ from django.db.models import Q
 
 from api.models import ExternalIdentifier
 from konova.models import Geometry
+from konova.sub_settings.lanis_settings import DEFAULT_SRID
+from konova.utils.geometry.geometry_validator import GeoJsonValidator
 from konova.utils.message_templates import DATA_UNSHARED
 
 
@@ -153,16 +155,20 @@ class AbstractModelAPISerializer:
         Returns:
             geometry (GEOSGeometry)
         """
-        if isinstance(geojson, dict):
-            geojson = json.dumps(geojson)
-        geometry = geos.fromstr(geojson)
-        if not geometry.valid:
-            raise ValueError(f"Invalid geometry: {geometry.valid_reason}")
-        is_4326 = Geometry.is_valid_4326(geometry)
-        if not is_4326:
-            raise ValueError("Geometry not in EPSG:4326 (WGS84). Unknown spatial reference system.")
-        geometry = Geometry.cast_to_rlp_srid(geometry)
-        geometry = Geometry.cast_to_multipolygon(geometry)
+        if isinstance(geojson, str):
+            geojson = json.loads(geojson)
+
+        geojson_validator = GeoJsonValidator(geojson, DEFAULT_SRID)
+        geojson_validator.validate()
+
+        if geojson_validator.errors:
+            raise ValueError(geojson_validator.errors)
+
+        geometry = geojson_validator.validated_geometry
+        is_input_geometry_too_small = geometry.area == 0.0 and geojson_validator.num_ignored_geometries > 0
+        if is_input_geometry_too_small:
+            raise ValueError(f"Your area was too small to be processed! Must be > 1m²!")
+
         return geometry
 
     def _get_obj_from_db(self, id, user):