reject uploaded file with mismatched plural form

weblate/trans/models/translation.py

@@ -1200,6 +1200,13 @@ class Translation(models.Model, URLMixin, PercentMixin, LoggerMixin):
         if author is None:
             author = get_author_name(request.user)
 
+        # Check valid plural forms
+        if hasattr(store.store, 'parseheader'):
+            header = store.store.parseheader()
+            if 'Plural-Forms' in header and \
+                    self.language.get_plural_form() != header['Plural-Forms']:
+                raise Exception('Plural forms do not match the language.')
+
         # List translations we should process
         # Filter out those who don't want automatic update, but keep ourselves
         translations = Translation.objects.filter(

weblate/trans/tests/data/cs-badplurals.po

+# Czech translations for PACKAGE package.
+# Copyright (C) 2012 THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# Automatically generated, 2012.
+# Testing Weblate, 2015.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Weblate Hello World 2012\n"
+"Report-Msgid-Bugs-To: <noreply@example.net>\n"
+"POT-Creation-Date: 2012-03-14 15:54+0100\n"
+"PO-Revision-Date: 2012-03-05 15:55+0100\n"
+"Last-Translator: Automatically generated\n"
+"Language-Team: Test Team <noreply@weblate.org>\n"
+"Language: cs\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=4; plural=(n==1) ? 0 : (n>=2 && n<=4) ? 1 : (n % 10 == 1) ? 3 : 2;\n"
+
+#: main.c:11
+#, c-format
+msgid "Hello, world!\n"
+msgstr "Ahoj světe!\n"
+
+#: main.c:12
+#, c-format
+msgid "Orangutan has %d banana.\n"
+msgid_plural "Orangutan has %d bananas.\n"
+msgstr[0] ""
+msgstr[1] ""
+msgstr[2] ""
+msgstr[3] ""
+
+#: main.c:13
+#, c-format
+msgid "Try Weblate at <http://demo.weblate.org/>!\n"
+msgstr ""
+
+#: main.c:14
+msgid "Thank you for using Weblate."
+msgstr ""

weblate/trans/tests/test_files.py

@@ -33,6 +33,7 @@ TEST_PO = get_test_file('cs.po')
 TEST_CSV = get_test_file('cs.csv')
 TEST_PO_BOM = get_test_file('cs-bom.po')
 TEST_FUZZY_PO = get_test_file('cs-fuzzy.po')
+TEST_BADPLURALS = get_test_file('cs-badplurals.po')
 TEST_MO = get_test_file('cs.mo')
 TEST_ANDROID = get_test_file('strings-cs.xml')
 
@@ -52,11 +53,14 @@ class ImportBaseTest(ViewTestCase):
         self.user.is_superuser = True
         self.user.save()
 
-    def do_import(self, **kwargs):
+    def do_import(self, test_file=None, follow=False, **kwargs):
         '''
         Helper to perform file import.
         '''
-        with open(self.test_file) as handle:
+        if test_file is None:
+            test_file = self.test_file
+
+        with open(test_file) as handle:
             params = {'file': handle}
             params.update(kwargs)
             return self.client.post(
@@ -64,7 +68,8 @@ class ImportBaseTest(ViewTestCase):
                     'upload_translation',
                     kwargs=self.kw_translation
                 ),
-                params
+                params,
+                follow=follow
             )
 
 
@@ -209,6 +214,24 @@ class ImportTest(ImportBaseTest):
         )
 
 
+class ImportErrorTest(ImportBaseTest):
+    '''
+    Testing import of broken files.
+    '''
+    def test_mismatched_plurals(self):
+        '''
+        Test importing a file with different number of plural forms.
+        In response to issue #900
+        '''
+        from django.contrib.messages import ERROR
+        response = self.do_import(test_file=TEST_BADPLURALS, follow=True)
+        self.assertRedirects(response, self.translation_url)
+        messages = list(response.context["messages"])
+        self.assertEquals(len(messages), 1)
+        self.assertEquals(messages[0].level, ERROR)
+        self.assertIn("Plural forms do not match", messages[0].message)
+
+
 class BOMImportTest(ImportTest):
     test_file = TEST_PO_BOM