From 3f3010014b33451553c62b005c2ec09a16a9f9ce Mon Sep 17 00:00:00 2001
From: Carl Meyer <carl@oddbird.net>
Date: Fri, 7 Oct 2011 15:45:52 +0000
Subject: [PATCH] Fixed #14678 -- Added validation to catch flatpages with the
 same URL on the same site. Thanks seler for the report, and joni,
 graham_king, and j4nu5 for work on the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16937 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/contrib/flatpages/admin.py       | 14 +------------
 django/contrib/flatpages/forms.py       | 28 +++++++++++++++++++++++++
 django/contrib/flatpages/tests/forms.py | 18 ++++++++++++++--
 docs/ref/contrib/flatpages.txt          |  8 +++++++
 4 files changed, 53 insertions(+), 15 deletions(-)
 create mode 100644 django/contrib/flatpages/forms.py

diff --git a/django/contrib/flatpages/admin.py b/django/contrib/flatpages/admin.py
index 1b377e967b..13294262f1 100644
--- a/django/contrib/flatpages/admin.py
+++ b/django/contrib/flatpages/admin.py
@@ -1,19 +1,7 @@
-from django import forms
 from django.contrib import admin
 from django.contrib.flatpages.models import FlatPage
 from django.utils.translation import ugettext_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_message = _("This value must contain only letters, numbers,"
-                          " dots, underscores, dashes, slashes or tildes."))
-
-    class Meta:
-        model = FlatPage
-
+from django.contrib.flatpages.forms import FlatpageForm
 
 class FlatPageAdmin(admin.ModelAdmin):
     form = FlatpageForm
diff --git a/django/contrib/flatpages/forms.py b/django/contrib/flatpages/forms.py
new file mode 100644
index 0000000000..b2811ff618
--- /dev/null
+++ b/django/contrib/flatpages/forms.py
@@ -0,0 +1,28 @@
+from django import forms
+from django.utils.translation import ugettext_lazy as _
+from django.contrib.flatpages.models import FlatPage
+
+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_message = _("This value must contain only letters, numbers,"
+                          " dots, underscores, dashes, slashes or tildes."))
+
+    class Meta:
+        model = FlatPage
+
+    def clean(self):
+        url = self.cleaned_data.get('url', None)
+        sites = self.cleaned_data.get('sites', None)
+
+        flatpages_with_same_url = FlatPage.objects.filter(url=url)
+
+        if flatpages_with_same_url.filter(sites__in=sites).exists():
+            for site in sites:
+                if flatpages_with_same_url.filter(sites=site).exists():
+                    raise forms.ValidationError(
+                        _('Flatpage with url %s already exists for site %s'
+                          % (url, site)))
+
+        return super(FlatpageForm, self).clean()
diff --git a/django/contrib/flatpages/tests/forms.py b/django/contrib/flatpages/tests/forms.py
index e8ca2b8e5c..83437ba733 100644
--- a/django/contrib/flatpages/tests/forms.py
+++ b/django/contrib/flatpages/tests/forms.py
@@ -1,5 +1,5 @@
 from django.conf import settings
-from django.contrib.flatpages.admin import FlatpageForm
+from django.contrib.flatpages.forms import FlatpageForm
 from django.test import TestCase
 
 class FlatpageAdminFormTests(TestCase):
@@ -11,7 +11,7 @@ class FlatpageAdminFormTests(TestCase):
         }
 
     def test_flatpage_admin_form_url_validation(self):
-        "The flatpage admin form validates correctly validates urls"
+        "The flatpage admin form correctly validates urls"
         self.assertTrue(FlatpageForm(data=dict(url='/new_flatpage/', **self.form_data)).is_valid())
         self.assertTrue(FlatpageForm(data=dict(url='/some.special~chars/', **self.form_data)).is_valid())
         self.assertTrue(FlatpageForm(data=dict(url='/some.very_special~chars-here/', **self.form_data)).is_valid())
@@ -21,3 +21,17 @@ class FlatpageAdminFormTests(TestCase):
         self.assertFalse(FlatpageForm(data=dict(url='/a ! char/', **self.form_data)).is_valid())
         self.assertFalse(FlatpageForm(data=dict(url='/a & char/', **self.form_data)).is_valid())
         self.assertFalse(FlatpageForm(data=dict(url='/a ? char/', **self.form_data)).is_valid())
+
+    def test_flatpage_admin_form_url_uniqueness_validation(self):
+        "The flatpage admin form correctly enforces url uniqueness among flatpages of the same site"
+        data = dict(url='/myflatpage1', **self.form_data)
+
+        FlatpageForm(data=data).save()
+
+        f = FlatpageForm(data=data)
+
+        self.assertFalse(f.is_valid())
+
+        self.assertEqual(
+            f.errors,
+            {'__all__': [u'Flatpage with url /myflatpage1 already exists for site example.com']})
diff --git a/docs/ref/contrib/flatpages.txt b/docs/ref/contrib/flatpages.txt
index db063f91ad..4a1f2970cb 100644
--- a/docs/ref/contrib/flatpages.txt
+++ b/docs/ref/contrib/flatpages.txt
@@ -148,6 +148,14 @@ Via the Python API
 
 .. currentmodule:: django.contrib.flatpages
 
+.. admonition:: Check for duplicate flatpage URLs.
+
+    If you add or modify flatpages via your own code, you will likely want to
+    check for duplicate flatpage URLs within the same site. The flatpage form
+    used in the admin performs this validation check, and can be imported from
+    :class:`django.contrib.flatpages.forms.FlatPageForm` and used in your own
+    views.
+
 Flatpage templates
 ==================