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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import re
from typing import Mapping
from typing import Sequence
from typing import Callable
from typing import TypeVar
from typing import NoReturn
from typing import Any
# =====
class ValidatorError(ValueError):
pass
# =====
_RetvalSeqT = TypeVar("_RetvalSeqT", bound=Sequence)
# =====
def raise_error(arg: Any, name: str, hide: bool=False) -> NoReturn:
arg_str = " "
if not hide:
arg_str = (f" {arg!r} " if isinstance(arg, (str, bytes)) else f" '{arg}' ")
raise ValidatorError(f"The argument{arg_str}is not a valid {name}")
def check_not_none(arg: Any, name: str) -> Any:
if arg is None:
raise ValidatorError(f"None argument is not a valid {name}")
return arg
def check_not_none_string(arg: Any, name: str, strip: bool=True) -> str:
arg = str(check_not_none(arg, name))
if strip:
arg = arg.strip()
return arg
def check_in_list(arg: Any, name: str, variants: (Sequence | Mapping | set)) -> Any:
if arg not in variants:
raise_error(arg, name)
return arg
def check_string_in_list(
arg: Any,
name: str,
variants: (Sequence[str] | Mapping[str, Any] | set[str]),
lower: bool=True,
) -> str:
arg = check_not_none_string(arg, name)
if lower:
arg = arg.lower()
return check_in_list(arg, name, variants)
def check_re_match(arg: Any, name: str, pattern: str, strip: bool=True, hide: bool=False) -> str:
arg = check_not_none_string(arg, name, strip=strip)
if re.match(pattern, arg, flags=re.MULTILINE) is None:
raise_error(arg, name, hide=hide)
return arg
def check_len(arg: _RetvalSeqT, name: str, limit: int) -> _RetvalSeqT:
if len(arg) > limit:
raise_error(arg, name)
return arg
def check_any(arg: Any, name: str, validators: list[Callable[[Any], Any]]) -> Any: # pylint: disable=inconsistent-return-statements
for validator in validators:
try:
return validator(arg)
except Exception:
pass
raise_error(arg, name)
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