[ENG-9824] - Add required metadata validation

osf/models/provider.py

@@ -257,6 +257,30 @@ def setup_share_source(self, provider_home_page):
 
         self.save()
 
+    def validate_required_metadata(self, osf_obj):
+        from jsonschema import validate, ValidationError as JsonSchemaValidationError
+        from osf.models.cedar_metadata import CedarMetadataRecord
+
+        if not self.required_metadata_template:
+            return
+
+        record = CedarMetadataRecord.objects.filter(
+            guid__in=osf_obj.guids.all(),
+            template=self.required_metadata_template,
+            is_published=True,
+        ).first()
+
+        if record is None:
+            raise ValidationError(
+                f'Object must have a published CEDAR metadata record for the required template '
+                f'"{self.required_metadata_template.schema_name}".'
+            )
+
+        try:
+            validate(record.metadata, self.required_metadata_template.template)
+        except JsonSchemaValidationError as e:
+            raise ValidationError(e.message)
+
 
 class CollectionProvider(AbstractProvider):
     DEFAULT_SUBSCRIPTIONS = [

osf_tests/test_validate_required_metadata.py

@@ -0,0 +1,120 @@
+import pytest
+from faker import Faker
+from django.core.exceptions import ValidationError
+
+from osf.models import CedarMetadataRecord, CedarMetadataTemplate
+from osf_tests.factories import AuthUserFactory, PreprintFactory, PreprintProviderFactory
+
+fake = Faker()
+
+VALID_JSONSCHEMA = {
+    '$schema': 'http://json-schema.org/draft-07/schema#',
+    'type': 'object',
+    'properties': {
+        'title': {'type': 'string'},
+    },
+    'required': ['title'],
+}
+
+
+@pytest.fixture()
+def user():
+    return AuthUserFactory()
+
+
+@pytest.fixture()
+def provider():
+    return PreprintProviderFactory()
+
+
+@pytest.fixture()
+def cedar_template():
+    return CedarMetadataTemplate.objects.create(
+        schema_name=fake.bs(),
+        cedar_id=fake.md5(),
+        template_version=1,
+        template=VALID_JSONSCHEMA,
+        active=True,
+    )
+
+
+@pytest.fixture()
+def preprint(user, provider):
+    return PreprintFactory(creator=user, provider=provider)
+
+
+@pytest.mark.django_db
+class TestValidateRequiredMetadata:
+
+    def test_no_required_template_passes(self, provider, preprint):
+        assert provider.required_metadata_template is None
+        provider.validate_required_metadata(preprint)
+
+    def test_missing_record_raises(self, provider, cedar_template, preprint):
+        provider.required_metadata_template = cedar_template
+        provider.save()
+
+        with pytest.raises(ValidationError, match='published CEDAR metadata record'):
+            provider.validate_required_metadata(preprint)
+
+    def test_unpublished_record_raises(self, provider, cedar_template, preprint):
+        provider.required_metadata_template = cedar_template
+        provider.save()
+
+        CedarMetadataRecord.objects.create(
+            guid=preprint.guids.first(),
+            template=cedar_template,
+            metadata={'title': 'My Preprint'},
+            is_published=False,
+        )
+
+        with pytest.raises(ValidationError, match='published CEDAR metadata record'):
+            provider.validate_required_metadata(preprint)
+
+    def test_published_valid_record_passes(self, provider, cedar_template, preprint):
+        provider.required_metadata_template = cedar_template
+        provider.save()
+
+        CedarMetadataRecord.objects.create(
+            guid=preprint.guids.first(),
+            template=cedar_template,
+            metadata={'title': 'My Preprint'},
+            is_published=True,
+        )
+
+        provider.validate_required_metadata(preprint)
+
+    def test_published_invalid_record_raises(self, provider, cedar_template, preprint):
+        provider.required_metadata_template = cedar_template
+        provider.save()
+
+        CedarMetadataRecord.objects.create(
+            guid=preprint.guids.first(),
+            template=cedar_template,
+            metadata={'title': 123},
+            is_published=True,
+        )
+
+        with pytest.raises(ValidationError):
+            provider.validate_required_metadata(preprint)
+
+    def test_record_for_wrong_template_raises(self, provider, cedar_template, preprint):
+        provider.required_metadata_template = cedar_template
+        provider.save()
+
+        other_template = CedarMetadataTemplate.objects.create(
+            schema_name=fake.bs(),
+            cedar_id=fake.md5(),
+            template_version=1,
+            template=VALID_JSONSCHEMA,
+            active=True,
+        )
+        CedarMetadataRecord.objects.create(
+            guid=preprint.guids.first(),
+            template=other_template,
+            metadata={'title': 'My Preprint'},
+            is_published=True,
+        )
+
+        with pytest.raises(ValidationError, match='published CEDAR metadata record'):
+            provider.validate_required_metadata(preprint)