Add artifact as a new manifest type

[noissue]

pulp_container/app/models.py

@@ -199,6 +199,9 @@ def init_manifest_nature(self):
         elif media_type := self.is_cosign():
             self.type = self.get_cosign_type(media_type)
             return True
+        elif self.is_artifact():
+            self.type = MANIFEST_TYPE.ARTIFACT
+            return True
         elif self.is_manifest_image():
             self.type = MANIFEST_TYPE.IMAGE
             return True
@@ -244,6 +247,20 @@ def is_helm_chart(self):
         except KeyError:
             return False
 
+    def is_artifact(self):
+        # artifact is valid only for OCI spec
+        if self.media_type != MEDIA_TYPE.MANIFEST_OCI:
+            return False
+
+        if self.json_manifest.get("artifactType", None):
+            return True
+
+        manifest_config_media_type = self.json_manifest["config"]["mediaType"]
+        return (
+            manifest_config_media_type == MEDIA_TYPE.OCI_EMPTY_JSON
+            or manifest_config_media_type not in vars(MEDIA_TYPE).values()
+        )
+
     class Meta:
         default_related_name = "%(app_label)s_%(model_name)s"
         unique_together = ("digest",)

pulp_container/constants.py

@@ -77,14 +77,15 @@
 SIGNATURE_API_EXTENSION_VERSION = 2
 
 MANIFEST_TYPE = SimpleNamespace(
-    IMAGE="image",
+    ARTIFACT="artifact",
     BOOTABLE="bootable",
-    FLATPAK="flatpak",
-    HELM="helm",
-    COSIGN_SIGNATURE="cosign_signature",
     COSIGN_ATTESTATION="cosign_attestation",
     COSIGN_ATTESTATION_BUNDLE="cosign_attestation_bundle",
     COSIGN_SBOM="cosign_sbom",
+    COSIGN_SIGNATURE="cosign_signature",
+    FLATPAK="flatpak",
+    HELM="helm",
+    IMAGE="image",
     INDEX="index",
     UNKNOWN="unknown",
 )