Add pulp-label serializer helpers to plugin api

Assisted by: claude-4.5-sonnet

(cherry picked from commit 9b0aa39)

Author: gerrod3

CHANGES/plugin_api/+pulp-labels-api.bugfix

@@ -0,0 +1 @@
+Exposed `PulpLabelsField` and `pulp_labels_validator` to the plugin API.

pulpcore/app/serializers/__init__.py

@@ -33,6 +33,7 @@
     JSONDictField,
     JSONListField,
     LatestVersionField,
+    PulpLabelsField,
     SingleContentArtifactField,
     RepositoryVersionsIdentityFromRepositoryField,
     RepositoryVersionRelatedField,

pulpcore/app/serializers/content.py

@@ -11,7 +11,7 @@
 
 class NoArtifactContentSerializer(base.ModelSerializer):
     pulp_href = base.DetailIdentityField(view_name_pattern=r"contents(-.*/.*)-detail")
-    pulp_labels = serializers.HStoreField(
+    pulp_labels = fields.PulpLabelsField(
         help_text=_(
             "A dictionary of arbitrary key/value pairs used to describe a specific "
             "Content instance."

pulpcore/app/serializers/fields.py

@@ -435,3 +435,13 @@ def pulp_labels_validator(value):
             )
 
     return value
+
+
+class PulpLabelsField(serializers.HStoreField):
+    """
+    Custom field for handling pulp labels that ensures proper dictionary format.
+    Converts JSON strings to dictionaries during validation.
+    """
+
+    def get_value(self, dictionary):
+        return dictionary.get(self.field_name, empty)

pulpcore/plugin/serializers/__init__.py

@@ -26,6 +26,8 @@
     ProgressReportSerializer,
     PRNField,
     PublicationSerializer,
+    PulpLabelsField,
+    pulp_labels_validator,
     RelatedField,
     RemoteSerializer,
     RepositorySerializer,
@@ -74,6 +76,8 @@
     "ProgressReportSerializer",
     "PRNField",
     "PublicationSerializer",
+    "PulpLabelsField",
+    "pulp_labels_validator",
     "RelatedField",
     "RemoteSerializer",
     "RepositorySerializer",