config: added service schema for zenodo records

* added export formats in config
* override bibtex serializer to include swhid

invenio.cfg

@@ -1064,3 +1064,16 @@ COMMUNITIES_SHOW_BROWSE_MENU_ENTRY = True
 
 JOBS_ADMINISTRATION_ENABLED = True
 """Enable Jobs administration view."""
+
+from invenio_app_rdm.config import APP_RDM_RECORD_EXPORTERS as default_exporters
+
+APP_RDM_RECORD_EXPORTERS = {
+    **default_exporters, 
+    "bibtex": {
+        "name": _("BibTeX"),
+        "serializer": ("zenodo_rdm.serializers:ZenodoBibtexSerializer"),
+        "params": {},
+        "content-type": "application/x-bibtex",
+        "filename": "{id}.bib",
+    }
+}

site/zenodo_rdm/config.py

@@ -6,6 +6,7 @@
 # under the terms of the MIT License; see LICENSE file for more details.
 """Custom code config."""
 
+
 from .params import ZenodoArgsSchema, ZenodoSearchOptions
 from .redirector import (
     communities_detail_view_function,
@@ -27,6 +28,7 @@
     redirect_records_search_slash,
     search_view_function,
 )
+from .schema import ZenodoRecordSchema
 
 # I18N_TRANSLATIONS_PATHS = [os.path.abspath("./site/zenodo_rdm/translations")]
 
@@ -370,3 +372,7 @@ def lock_edit_record_published_files(service, identity, record=None, draft=None)
     "//cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.js"
     "?config=TeX-AMS-MML_HTMLorMML"
 )
+
+
+RDM_RECORD_SCHEMA = ZenodoRecordSchema
+"""Base record schema."""

site/zenodo_rdm/legacy/serializers/schemas/zenodojson.py

@@ -177,6 +177,8 @@ class ZenodoSchema(common.LegacySchema):
     files = fields.Method("dump_files", dump_only=True)
     metadata = fields.Nested(MetadataSchema)
 
+    swh = fields.Dict(dump_only=True)
+
     owners = fields.Method("dump_owners")
 
     def dump_owners(self, obj):

site/zenodo_rdm/schema.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2024 CERN.
+#
+# Zenodo-RDM is free software; you can redistribute it and/or modify
+# it under the terms of the MIT License; see LICENSE file for more details.
+"""Zenodo-RDM service schema."""
+
+from invenio_rdm_records.services.schemas import RDMRecordSchema
+from marshmallow import Schema, fields
+
+
+class SWHSchema(Schema):
+    """Software Heritage schema."""
+
+    swhid = fields.Str()
+
+
+class ZenodoRecordSchema(RDMRecordSchema):
+    """Zenodo service schema.
+
+    This schema subclasses the base schema and extends it with Zenodo-specific
+    fields.
+    """
+
+    swh = fields.Nested(SWHSchema, dump_only=True)

site/zenodo_rdm/serializers/__init__.py

@@ -0,0 +1,11 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2024 CERN.
+#
+# ZenodoRDM is free software; you can redistribute it and/or modify
+# it under the terms of the MIT License; see LICENSE file for more details.
+"""Zenodo serializers."""
+
+from .bibtex import ZenodoBibtexSerializer
+
+__all__ = ("ZenodoBibtexSerializer",)

site/zenodo_rdm/serializers/bibtex.py

@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2024 CERN.
+#
+# ZenodoRDM is free software; you can redistribute it and/or modify
+# it under the terms of the MIT License; see LICENSE file for more details.
+"""Zenodo bibtex serializer."""
+
+from flask_resources import BaseListSchema, MarshmallowSerializer
+from flask_resources.serializers import SimpleSerializer
+from invenio_rdm_records.resources.serializers import BibtexSerializer
+from invenio_rdm_records.resources.serializers.bibtex.schema import BibTexSchema
+from marshmallow import fields, missing
+
+
+class ZenodoBibtexSchema(BibTexSchema):
+    """Zenodo bibtex schema."""
+
+    swhid = fields.Method("get_swhid")
+
+    def get_swhid(self, obj):
+        """Get swhid."""
+        return obj.get("swh", {}).get("swhid") or missing
+
+
+class ZenodoBibtexSerializer(MarshmallowSerializer):
+    """Zenodo bibtex serializer."""
+
+    def __init__(self, **options):
+        """Initialize serializer."""
+        super().__init__(
+            format_serializer_cls=SimpleSerializer,
+            object_schema_cls=ZenodoBibtexSchema,
+            list_schema_cls=BaseListSchema,
+            encoder=self.bibtex_tostring,
+        )
+
+    @classmethod
+    def bibtex_tostring(cls, record):
+        """Stringify a BibTex record."""
+        return record