refactor: extract vdb configs into pydantic-setting based dify configs (#5426)

api/configs/middleware/vdb/opensearch_configs.py

@@ -0,0 +1,34 @@
+from typing import Optional
+
+from pydantic import BaseModel, Field, PositiveInt
+
+
+class OpenSearchConfigs(BaseModel):
+    """
+    OpenSearch configs
+    """
+
+    OPENSEARCH_HOST: Optional[str] = Field(
+        description='OpenSearch host',
+        default=None,
+    )
+
+    OPENSEARCH_PORT: PositiveInt = Field(
+        description='OpenSearch port',
+        default=9200,
+    )
+
+    OPENSEARCH_USER: Optional[str] = Field(
+        description='OpenSearch user',
+        default=None,
+    )
+
+    OPENSEARCH_PASSWORD: Optional[str] = Field(
+        description='OpenSearch password',
+        default=None,
+    )
+
+    OPENSEARCH_SECURE: bool = Field(
+        description='whether to use SSL connection for OpenSearch',
+        default=False,
+    )