feat: Allow unverified OpenAPI calls (#8562)

* Feed through ssl_verify value to OpenAPI

* Add release note

* Update serialization methods

* Applied black formatting

haystack/components/connectors/openapi_service.py

@@ -7,7 +7,7 @@
 from copy import copy
 from typing import Any, Dict, List, Optional, Union
 
-from haystack import component, logging
+from haystack import component, default_from_dict, default_to_dict, logging
 from haystack.dataclasses import ChatMessage, ChatRole
 from haystack.lazy_imports import LazyImport
 
@@ -69,11 +69,15 @@ class OpenAPIServiceConnector:
 
     """
 
-    def __init__(self):
+    def __init__(self, ssl_verify: Optional[Union[bool, str]] = None):
         """
         Initializes the OpenAPIServiceConnector instance
+
+        :param ssl_verify: Decide if to use SSL verification to the requests or not,
+        in case a string is passed, will be used as the CA.
         """
         openapi_imports.check()
+        self.ssl_verify = ssl_verify
 
     @component.output_types(service_response=Dict[str, Any])
     def run(
@@ -112,7 +116,7 @@ def run(
         function_invocation_payloads = self._parse_message(last_message)
 
         # instantiate the OpenAPI service for the given specification
-        openapi_service = OpenAPI(service_openapi_spec)
+        openapi_service = OpenAPI(service_openapi_spec, ssl_verify=self.ssl_verify)
         self._authenticate_service(openapi_service, service_credentials)
 
         response_messages = []
@@ -127,6 +131,27 @@ def run(
 
         return {"service_response": response_messages}
 
+    def to_dict(self) -> Dict[str, Any]:
+        """
+        Serializes the component to a dictionary.
+
+        :returns:
+            Dictionary with serialized data.
+        """
+        return default_to_dict(self, ssl_verify=self.ssl_verify)
+
+    @classmethod
+    def from_dict(cls, data: Dict[str, Any]) -> "OpenAPIServiceConnector":
+        """
+        Deserializes the component from a dictionary.
+
+        :param data:
+            The dictionary to deserialize from.
+        :returns:
+            The deserialized component.
+        """
+        return default_from_dict(cls, data)
+
     def _parse_message(self, message: ChatMessage) -> List[Dict[str, Any]]:
         """
         Parses the message to extract the method invocation descriptor.

releasenotes/notes/allow-unverified-openapi-calls-46842af37464bb6d.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    When making function calls via OpenAPI, allow both switching SSL verification off and specifying a certificate authority to use for it.

test/components/connectors/test_openapi_service.py

@@ -140,7 +140,7 @@ def test_run(self, openapi_mock, test_files_path):
 
         connector.run(messages=messages, service_openapi_spec=spec, service_credentials="fake_key")
 
-        openapi_mock.assert_called_once_with(spec)
+        openapi_mock.assert_called_once_with(spec, ssl_verify=None)
         mock_service.authenticate.assert_called_once_with("apikey", "fake_key")
 
         # verify call went through on the wire with the correct parameters
@@ -331,3 +331,11 @@ def test_run_with_body_properties_missing_in_invocation_args(self, openapi_mock,
             ValueError, match="Missing requestBody parameter: 'message' required for the 'greet' operation."
         ):
             connector.run(messages=messages, service_openapi_spec=spec)
+
+    def test_serialization(self):
+        for test_val in ("myvalue", True, None):
+            openapi_service_connector = OpenAPIServiceConnector(test_val)
+            serialized = openapi_service_connector.to_dict()
+            assert serialized["init_parameters"]["ssl_verify"] == test_val
+            deserialized = OpenAPIServiceConnector.from_dict(serialized)
+            assert deserialized.ssl_verify == test_val