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from typing import Optional

from knot_resolver.datamodel.types import ReadableFile
from knot_resolver.utils.modeling import ConfigSchema


class LuaSchema(ConfigSchema):
    """
    Custom Lua configuration.

    ---
    script_only: Ignore declarative configuration and use only Lua script or file defined in this section.
    script: Custom Lua configuration script.
    script_file: Path to file that contains Lua configuration script.
    """

    script_only: bool = False
    script: Optional[str] = None
    script_file: Optional[ReadableFile] = None

    def _validate(self) -> None:
        if self.script and self.script_file:
            raise ValueError("'lua.script' and 'lua.script-file' are both defined, only one can be used")