[Fixes #12749] Sanitize uploaded layers that start with a numeric character (#13000)

Author: mattiagiupponi

geonode/upload/handlers/base.py

@@ -193,6 +193,9 @@ def fixup_name(self, name):
         We use replace because it looks to be one of the fasted options:
         https://stackoverflow.com/questions/3411771/best-way-to-replace-multiple-characters-in-a-string
         """
+        prefix = name[0]
+        if prefix.isnumeric():
+            name = name.replace(name[0], "_")
         return (
             name.lower()
             .replace("-", "_")

geonode/upload/handlers/tests.py

@@ -25,6 +25,7 @@
     drop_dynamic_model_schema,
     should_be_imported,
 )
+from geonode.upload.handlers.base import BaseHandler
 
 
 class TestHandlersUtils(TestCase):
@@ -81,3 +82,13 @@ def test_drop_dynamic_model_schema(self):
         drop_dynamic_model_schema(schema_model=_model_schema)
 
         self.assertFalse(ModelSchema.objects.filter(name="model_schema").exists())
+
+    def test_fixup_name_replace_digits_with_underscore(self):
+        """
+        Ref https://github.com/GeoNode/geonode/issues/12749
+        If the layer start with a digit, we should translate as a string
+        """
+        layer_name = "1layername"
+        expected_name = "_layername"
+        actual = BaseHandler().fixup_name(layer_name)
+        self.assertEqual(expected_name, actual)