Add DCAT_AP_HVD_CATEGORY_LEGISLATION constant and validator for hvd_c…

…ategory

ckanext/schemingdcat/config.py

@@ -286,4 +286,6 @@
         'resource':
             ['url', 'availability', 'mimetype', 'status', 'resource_relation', 'license', 'rights', 'conforms_to', 'reference_system']
     }
-EMAIL_FIELD_NAMES = ['publisher_email', 'maintainer_email', 'author_email', ]
+EMAIL_FIELD_NAMES = ['publisher_email', 'maintainer_email', 'author_email', ]
+
+DCAT_AP_HVD_CATEGORY_LEGISLATION = "http://data.europa.eu/eli/reg_impl/2023/138/oj"

ckanext/schemingdcat/validators.py

@@ -31,7 +31,8 @@
 from ckanext.schemingdcat.utils import parse_json
 from ckanext.schemingdcat.config import (
     OGC2CKAN_HARVESTER_MD_CONFIG,
-    mimetype_base_uri
+    mimetype_base_uri,
+    DCAT_AP_HVD_CATEGORY_LEGISLATION
 )
 
 log = logging.getLogger(__name__)
@@ -915,4 +916,30 @@ def validator(key, data, errors, context):
 
         data[key] = value
 
+    return validator
+
+@scheming_validator
+@validator
+def schemingdcat_hvd_category_applicable_legislation(field, schema):
+    """
+    Returns a validator function that checks if the 'hvd_category' value is not empty. If it is not empty, it updates the value of the field by adding the Commission Implementing Regulation (EU) 2023/138 of 21 December 2022 laying down a list of specific high-value datasets and the arrangements for their publication and re-use (Text with EEA relevance) to all datasets that contain an hvd_category (HVD Category).
+
+    Args:
+        field (dict): Information about the field to be updated.
+        schema (dict): The schema for the field to be updated.
+
+    Returns:
+        function: A validation function that updates the field based on the presence of 'hvd_category'.
+    """   
+    def validator(key, data, errors, context):
+        hvd_category = data.get(('hvd_category', ))
+        if hvd_category:
+            if isinstance(data.get(key), list):
+                if not data[key]:
+                    data[key] = [DCAT_AP_HVD_CATEGORY_LEGISLATION]
+                else:
+                    data[key].append(DCAT_AP_HVD_CATEGORY_LEGISLATION)
+            else:
+                data[key] = [DCAT_AP_HVD_CATEGORY_LEGISLATION]
+
     return validator