def require_valid_thumbnail_filename(cls,
thumbnail_filename,
strict=False):
"""Checks whether the thumbnail filename of the blog post is a valid
one.
Args:
thumbnail_filename: str. The thumbnail filename to validate.
strict: bool. Enable strict checks on the blog post when the
blog post is published or is going to be published.
Raises:
ValidationError. Provided thumbnail filename is invalid.
"""
if strict:
if not isinstance(thumbnail_filename, python_utils.BASESTRING):
raise utils.ValidationError(
'Expected thumbnail filename to be a string, received: %s.'
% thumbnail_filename)
if thumbnail_filename == '':
raise utils.ValidationError(
'Thumbnail filename should not be empty.')
utils.require_valid_image_filename(thumbnail_filename)
def _assert_valid_image_filename(
self, expected_error_substring: str, image_filename: str
) -> None:
"""Helper method for test_require_valid_image_filename."""
with self.assertRaisesRegex( # type: ignore[no-untyped-call]
utils.ValidationError, expected_error_substring):
utils.require_valid_image_filename(
image_filename)
def test_require_valid_image_filename(self) -> None:
"""Test image filename validation."""
self._assert_valid_image_filename(
'Expected image filename to be a string, received 10', 10) # type: ignore[arg-type]
self._assert_valid_image_filename(
'Image filename should not start with a dot.', '.name')
self._assert_valid_image_filename(
'Image filename should not include slashes or '
'consecutive dot characters.', 'file/name')
self._assert_valid_image_filename(
'Image filename should not include slashes or '
'consecutive dot characters.', 'file..name')
self._assert_valid_image_filename(
'Image filename should include an extension.', 'name')
filename = 'filename.svg'
utils.require_valid_image_filename(filename)
