marshmallow: add b64 existence validation

cern_search_rest_api/modules/cernsearch/marshmallow/json.py

@@ -7,10 +7,21 @@
 # granted to it by virtue of its status as Intergovernmental Organization
 # or submit itself to any jurisdiction.
 
+
+from flask import current_app
 from invenio_records_rest.schemas import RecordMetadataSchemaJSONV1
+from invenio_indexer.utils import default_record_to_index
 from marshmallow import validates_schema, ValidationError
 
 
+def has_and_needs_binary(original_data):
+    es_index, doc = default_record_to_index(original_data)
+    binary_index_list = current_app.config['SEARCH_DOC_PIPELINES']
+    if doc in binary_index_list and not original_data.get('b64'):
+        return False
+    return True
+
+
 class CSASRecordSchemaV1(RecordMetadataSchemaJSONV1):
 
     @validates_schema(pass_original=True)
@@ -29,4 +40,7 @@ class CSASRecordSchemaV1(RecordMetadataSchemaJSONV1):
         if not owner or not isinstance(owner, list):
             raise ValidationError('Missing or wrong type (not an array) in '
                                   'field _access.owner')
-        return
+        if not has_and_needs_binary(original_data):
+            raise ValidationError('Record to be index belongs to binary index '
+                                  'but does not contain the [b64] field')
+        return
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