fix: Filter out null chars from OpenAI response (#5187)

mealie/schema/openai/_base.py

@@ -1,7 +1,12 @@
+import re
+from typing import Self
+
 from pydantic import BaseModel
 
 from mealie.core.root_logger import get_logger
 
+RE_NULLS = re.compile(r"[\x00\u0000]|\\u0000")
+
 logger = get_logger()
 
 
@@ -14,14 +19,26 @@ class OpenAIBase(BaseModel):
     __doc__ = ""  # we don't want to include the docstring in the JSON schema
 
     @classmethod
-    def parse_openai_response(cls, response: str | None):
-        """
-        This method should be implemented in the child class. It should
-        parse the JSON response from OpenAI and return a dictionary.
-        """
+    def _preprocess_response(cls, response: str | None) -> str:
+        if not response:
+            return ""
 
+        response = re.sub(RE_NULLS, "", response)
+        return response
+
+    @classmethod
+    def _process_response(cls, response: str) -> Self:
         try:
-            return cls.model_validate_json(response or "")
+            return cls.model_validate_json(response)
         except Exception:
             logger.debug(f"Failed to parse OpenAI response as {cls}. Response: {response}")
             raise
+
+    @classmethod
+    def parse_openai_response(cls, response: str | None) -> Self:
+        """
+        Parse the OpenAI response into a class instance.
+        """
+
+        response = cls._preprocess_response(response)
+        return cls._process_response(response)