Patched code sample

import re
import ast

# The insecure blocklist is removed. Validation is now done via AST parsing.

def pythonCodeValidator(code: str) -> bool:
    """
    Validates the given Python code by parsing it into an
    Abstract Syntax Tree (AST) and checking for disallowed nodes.
    """
    # FIX: The code is parsed into an AST and walked to disallow dangerous nodes.
    try:
        tree = ast.parse(code)
        for node in ast.walk(tree):
            if isinstance(node, (ast.Import, ast.ImportFrom)):
                return False
            # Check for dangerous attribute access like `__builtins__.__import__`
            if isinstance(node, ast.Attribute) and node.attr in ('__import__', 'exec', 'eval'):
                return False
    except SyntaxError:
        return False  # Invalid Python code is not allowed
    return True

class AirtableAgentNode:
    """
    Represents a node that can execute Python code generated by an LLM
    in response to a prompt, supposedly in a sandboxed environment.
    """
    def execute_code_tool(self, generated_code: str):
        """
        Executes the provided code string if it passes validation.
        """
        if not pythonCodeValidator(generated_code):
            raise ValueError("Disallowed Python code was detected.")

        # The code is executed in an environment like pyodide.
        # We use exec() here to represent the code execution sink.
        exec(generated_code, {"__builtins__": {}})