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74 lines (57 loc) · 2.05 KB
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"""Cron."""
# local
from .utils import validator
def _validate_cron_item(item: str, min_val: int, max_val: int):
# An item may carry a step, e.g. "*/5", "1-30/2" or "5/10".
if "/" in item:
base, _, step = item.partition("/")
if not step.isdecimal() or int(step) < 1:
return False
else:
base = item
if base == "*":
return True
if "-" in base:
parts = base.split("-")
if len(parts) != 2 or not parts[0].isdecimal() or not parts[1].isdecimal():
return False
start, end = int(parts[0]), int(parts[1])
return min_val <= start <= max_val and min_val <= end <= max_val and start <= end
if base.isdecimal():
return min_val <= int(base) <= max_val
return False
def _validate_cron_component(component: str, min_val: int, max_val: int):
# A field is a comma-separated list of items, each optionally stepped.
return all(_validate_cron_item(item, min_val, max_val) for item in component.split(","))
@validator
def cron(value: str, /):
"""Return whether or not given value is a valid cron string.
Examples:
>>> cron('*/5 * * * *')
True
>>> cron('30-20 * * * *')
ValidationError(func=cron, args={'value': '30-20 * * * *'})
Args:
value:
Cron string to validate.
Returns:
(Literal[True]): If `value` is a valid cron string.
(ValidationError): If `value` is an invalid cron string.
"""
if not value:
return False
try:
minutes, hours, days, months, weekdays = value.strip().split()
except ValueError as err:
raise ValueError("Badly formatted cron string") from err
if not _validate_cron_component(minutes, 0, 59):
return False
if not _validate_cron_component(hours, 0, 23):
return False
if not _validate_cron_component(days, 1, 31):
return False
if not _validate_cron_component(months, 1, 12):
return False
if not _validate_cron_component(weekdays, 0, 7):
return False
return True