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venv/Lib/site-packages/django/contrib/flatpages/forms.py

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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, 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()