Support knowledge metadata filter (#15982)

api/services/external_knowledge_service.py

@@ -8,6 +8,7 @@ import validators
 
 from constants import HIDDEN_VALUE
 from core.helper import ssrf_proxy
+from core.rag.entities.metadata_entities import MetadataCondition
 from extensions.ext_database import db
 from models.dataset import (
     Dataset,
@@ -245,7 +246,11 @@ class ExternalDatasetService:
 
     @staticmethod
     def fetch_external_knowledge_retrieval(
-        tenant_id: str, dataset_id: str, query: str, external_retrieval_parameters: dict
+        tenant_id: str,
+        dataset_id: str,
+        query: str,
+        external_retrieval_parameters: dict,
+        metadata_condition: Optional[MetadataCondition] = None,
     ) -> list:
         external_knowledge_binding = ExternalKnowledgeBindings.query.filter_by(
             dataset_id=dataset_id, tenant_id=tenant_id
@@ -272,6 +277,7 @@ class ExternalDatasetService:
             },
             "query": query,
             "knowledge_id": external_knowledge_binding.external_knowledge_id,
+            "metadata_condition": metadata_condition.model_dump() if metadata_condition else None,
         }
 
         response = ExternalDatasetService.process_external_api(