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from __future__ import annotations
from dataclasses import dataclass, field
from typing import TYPE_CHECKING
from litestar.exceptions import ImproperlyConfiguredException
__all__ = ("AllowedHostsConfig",)
if TYPE_CHECKING:
from litestar.types import Scopes
@dataclass
class AllowedHostsConfig:
"""Configuration for allowed hosts protection.
To enable allowed hosts protection, pass an instance of this class to the :class:`Litestar <litestar.app.Litestar>`
constructor using the ``allowed_hosts`` key.
"""
allowed_hosts: list[str] = field(default_factory=lambda: ["*"])
"""A list of trusted hosts.
Use ``*.`` to allow all hosts, or prefix domains with ``*.`` to allow all sub domains.
"""
exclude: str | list[str] | None = field(default=None)
"""A pattern or list of patterns to skip in the Allowed Hosts middleware."""
exclude_opt_key: str | None = field(default=None)
"""An identifier to use on routes to disable hosts check for a particular route."""
scopes: Scopes | None = field(default=None)
"""ASGI scopes processed by the middleware, if None both ``http`` and ``websocket`` will be processed."""
www_redirect: bool = field(default=True)
"""A boolean dictating whether to redirect requests that start with ``www.`` and otherwise match a trusted host."""
def __post_init__(self) -> None:
"""Ensure that the trusted hosts have correct domain wildcards."""
for host in self.allowed_hosts:
if host != "*" and "*" in host and not host.startswith("*."):
raise ImproperlyConfiguredException(
"domain wildcards can only appear in the beginning of the domain, e.g. ``*.example.com``"
)
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