def is_base64bytes(value, length=None):
"""check whether the value is ``length`` base64-encoded bytes
if ``length`` is not given, allow any length
"""
if length is not None:
length = int(length)
if not isinstance(value, str):
raise validate.VdtTypeError(value)
try:
data = base64.b64decode(value)
except binascii.Error:
raise validate.VdtValueError(value)
if length is not None and len(data) != length:
raise validate.VdtValueError(value)
return data
def is_file(value):
"""check whether the value is a valid file system path"""
if not isinstance(value, str):
raise validate.VdtTypeError(value)
if not os.path.isfile(value):
raise validate.VdtValueError(value)
return value
def is_optionlist(value, *options):
"""check whether all list items are in ``options``"""
try:
if not all(isinstance(v, str) for v in options):
raise validate.VdtParamError(options, value)
except TypeError as e:
raise validate.VdtParamError(str(e), value)
val = validator.check('force_list', value)
if not all(v in options for v in val):
raise validate.VdtValueError(value)
return val
def validate_convert(value, func, name=None):
"""Helper function for validate parameter conversion"""
if value is None:
return None
try:
return func(value)
except (TypeError, ValueError):
if name is None:
raise validate.VdtValueError(value)
else:
raise validate.VdtParamError(name, value)
def is_timedelta(value):
"""create timedeltas"""
if isinstance(value, (int, float)):
return datetime.timedelta(days=value)
elif isinstance(value, str):
if value.count(':') > 2:
raise validate.VdtValueError(value)
try:
items = [
(n, float(x))
for n, x in zip(('days', 'hours', 'minutes'), value.split(':'))
]
except ValueError:
raise validate.VdtTypeError(value)
return datetime.timedelta(**dict(items))
else:
raise validate.VdtTypeError(value)