Prepare NPM references and mutation API

dns_sync/plugins/adapters/npm.py

@@ -6,6 +6,7 @@ from ...adapters import (
     Capability,
     CapabilityOperation,
     DiscoveredObject,
+    ObjectReference,
 )
 from ...npm_client import NpmClient
 
@@ -81,11 +82,39 @@ class Plugin:
                 field: row.get(field)
                 for field in _PROXY_HOST_FIELDS
             }
+            certificate_id = row.get("certificate_id")
+
+            if certificate_id in (None, "", 0, "0"):
+                references = ()
+            else:
+                if isinstance(certificate_id, bool):
+                    raise RuntimeError(
+                        "NPM proxy host has invalid certificate_id"
+                    )
+
+                certificate_local_key = str(
+                    certificate_id
+                ).strip()
+
+                if not certificate_local_key:
+                    raise RuntimeError(
+                        "NPM proxy host has invalid certificate_id"
+                    )
+
+                references = (
+                    ObjectReference(
+                        relation="certificate",
+                        object_type=CERTIFICATES,
+                        local_key=certificate_local_key,
+                    ),
+                )
+
             discovered.append(
                 DiscoveredObject(
                     object_type=PROXY_HOSTS,
                     local_key=self._local_key(row, "proxy host"),
                     payload=payload,
+                    references=references,
                 )
             )