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from __future__ import absolute_import, unicode_literals
from django.conf import settings
from django.core import checks
from django.core.exceptions import ImproperlyConfigured
from .sanitizer import Sanitizer
try:
from functools import lru_cache
except ImportError: # pragma: no cover
# Django versions older than 3.0
from django.utils.lru_cache import lru_cache
def _get_sanitizer(name="default"):
sanitizers = getattr(settings, "HTML_SANITIZERS", {})
if name in sanitizers:
return Sanitizer(sanitizers[name])
elif name == "default":
return Sanitizer()
raise ImproperlyConfigured(
"Unknown sanitizer %r, did you define HTML_SANITIZERS[%r] in your"
" Django settings module?" % (name, name)
)
get_sanitizer = lru_cache(maxsize=None)(_get_sanitizer)
@checks.register()
def check_configuration(app_configs, **kwargs):
errors = []
sanitizers = ["default"] + list(getattr(settings, "HTML_SANITIZERS", {}))
for name in sorted(set(sanitizers)):
try:
_get_sanitizer(name)
except TypeError as exc:
errors.append(
checks.Error(
"Invalid sanitizer configuration '%s': %s" % (name, exc),
id="html_sanitizer.E001",
)
)
return errors
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