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# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""Validators for attachments."""
__metaclass__ = type
__all__ = ['attachment_size_constraint']
from lp.app.validators import LaunchpadValidationError
from lp.services.config import config
def attachment_size_constraint(value):
"""Constraint for an attachment's file size.
The file is not allowed to be empty.
"""
size = len(value)
max_size = config.launchpad.max_attachment_size
if size == 0:
raise LaunchpadValidationError(u'Cannot upload empty file.')
elif max_size > 0 and size > max_size:
raise LaunchpadValidationError(
u'Cannot upload files larger than %i bytes' % max_size)
else:
return True
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