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from django import forms
from django.conf import settings
from django.contrib.flatpages.models import FlatPage
from django.core.exceptions import ValidationError
from django.utils.translation import gettext
from django.utils.translation import gettext_lazy as _
class FlatpageForm(forms.ModelForm):
url = forms.RegexField(
label=_("URL"),
max_length=100,
regex=r"^[-\w/\.~]+$",
help_text=_(
"Example: “/about/contact/”. Make sure to have leading and trailing "
"slashes."
),
error_messages={
"invalid": _(
"This value must contain only letters, numbers, dots, "
"underscores, dashes, slashes or tildes."
),
},
)
class Meta:
model = FlatPage
fields = "__all__"
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
if not self._trailing_slash_required():
self.fields["url"].help_text = _(
"Example: “/about/contact”. Make sure to have a leading slash."
)
def _trailing_slash_required(self):
return (
settings.APPEND_SLASH
and "django.middleware.common.CommonMiddleware" in settings.MIDDLEWARE
)
def clean_url(self):
url = self.cleaned_data["url"]
if not url.startswith("/"):
raise ValidationError(
gettext("URL is missing a leading slash."),
code="missing_leading_slash",
)
if self._trailing_slash_required() and not url.endswith("/"):
raise ValidationError(
gettext("URL is missing a trailing slash."),
code="missing_trailing_slash",
)
return url
def clean(self):
url = self.cleaned_data.get("url")
sites = self.cleaned_data.get("sites")
same_url = FlatPage.objects.filter(url=url)
if self.instance.pk:
same_url = same_url.exclude(pk=self.instance.pk)
if sites and same_url.filter(sites__in=sites).exists():
for site in sites:
if same_url.filter(sites=site).exists():
raise ValidationError(
_("Flatpage with url %(url)s already exists for site %(site)s"),
code="duplicate_url",
params={"url": url, "site": site},
)
return super().clean()
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