From 22a92cb3df8c8abf71e2339d6eb059c2d523181a Mon Sep 17 00:00:00 2001
From: mpeltriaux <Michel_Peltriaux@web.de>
Date: Fri, 10 Jul 2026 19:01:24 +0200
Subject: [PATCH] # Hotfix

* adds special error message treatment for non-EPSG:4326 geometries
---
 api/utils/serializer/serializer.py |  3 +++
 konova/models/geometry.py          | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/api/utils/serializer/serializer.py b/api/utils/serializer/serializer.py
index 4ed514c2..4924d742 100644
--- a/api/utils/serializer/serializer.py
+++ b/api/utils/serializer/serializer.py
@@ -156,6 +156,9 @@ class AbstractModelAPISerializer:
         if isinstance(geojson, dict):
             geojson = json.dumps(geojson)
         geometry = geos.fromstr(geojson)
+        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)
         return geometry
diff --git a/konova/models/geometry.py b/konova/models/geometry.py
index 663d5413..f064d01b 100644
--- a/konova/models/geometry.py
+++ b/konova/models/geometry.py
@@ -462,6 +462,26 @@ class Geometry(BaseResource):
         conflict_geoms = Geometry.objects.filter(id__in=conflict_geoms_id)
         return conflict_geoms
 
+    @staticmethod
+    def is_valid_4326(geometry):
+        """ Checks whether a given geometry's coordinates are in a valid range to be of EPSG:4326
+
+        Args:
+            geometry: The geometry
+
+        Returns:
+            ret_val (bool): Whether the geometry is valid EPSG:4326
+        """
+        if not geometry.centroid.coords:
+            # No coordinates at all found, therefore technically proper 4326
+            return True
+
+        try:
+            lat,lon = geometry.centroid.coords
+            return (-90.0 <= lat <= 90.0) and (-180.0 <= lon <= 180.0)
+        except IndexError:
+            return False
+
 
 class GeometryConflict(UuidModel):
     """