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File Name : utils.py

# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import annotations

import enum
import sys
import types
import typing
import warnings

# We use a UserWarning subclass, instead of DeprecationWarning, because CPython
# decided deprecation warnings should be invisible by default.
class CryptographyDeprecationWarning(UserWarning):
    pass

# Several APIs were deprecated with no specific end-of-life date because of the
# ubiquity of their use. They should not be removed until we agree on when that
# cycle ends.
DeprecatedIn36 = CryptographyDeprecationWarning
DeprecatedIn37 = CryptographyDeprecationWarning
DeprecatedIn40 = CryptographyDeprecationWarning
DeprecatedIn41 = CryptographyDeprecationWarning
DeprecatedIn42 = CryptographyDeprecationWarning
DeprecatedIn43 = CryptographyDeprecationWarning

def _check_bytes(name: str, value: bytes) -> None:
    if not isinstance(value, bytes):
        raise TypeError(f"{name} must be bytes")

def _check_byteslike(name: str, value: bytes) -> None:
    try:
        memoryview(value)
    except TypeError:
        raise TypeError(f"{name} must be bytes-like")

def int_to_bytes(integer: int, length: int | None = None) -> bytes:
    if length == 0:
        raise ValueError("length argument can't be 0")
    return integer.to_bytes(
        length or (integer.bit_length() + 7) // 8 or 1, "big"
    )

class InterfaceNotImplemented(Exception):
    pass

class _DeprecatedValue:
    def __init__(self, value: object, message: str, warning_class):
        self.value = value
        self.message = message
        self.warning_class = warning_class

class _ModuleWithDeprecations(types.ModuleType):
    def __init__(self, module: types.ModuleType):
        super().__init__(module.__name__)
        self.__dict__["_module"] = module

def __getattr__(self, attr: str) -> object:
        obj = getattr(self._module, attr)
        if isinstance(obj, _DeprecatedValue):
            warnings.warn(obj.message, obj.warning_class, stacklevel=2)
            obj = obj.value
        return obj

def __setattr__(self, attr: str, value: object) -> None:
        setattr(self._module, attr, value)

def __delattr__(self, attr: str) -> None:
        obj = getattr(self._module, attr)
        if isinstance(obj, _DeprecatedValue):
            warnings.warn(obj.message, obj.warning_class, stacklevel=2)

delattr(self._module, attr)

def __dir__(self) -> typing.Sequence[str]:
        return ["_module", *dir(self._module)]

def deprecated(
    value: object,
    module_name: str,
    message: str,
    warning_class: type[Warning],
    name: str | None = None,
) -> _DeprecatedValue:
    module = sys.modules[module_name]
    if not isinstance(module, _ModuleWithDeprecations):
        sys.modules[module_name] = module = _ModuleWithDeprecations(module)
    dv = _DeprecatedValue(value, message, warning_class)
    # Maintain backwards compatibility with `name is None` for pyOpenSSL.
    if name is not None:
        setattr(module, name, dv)
    return dv

def cached_property(func: typing.Callable) -> property:
    cached_name = f"_cached_{func}"
    sentinel = object()

def inner(instance: object):
        cache = getattr(instance, cached_name, sentinel)
        if cache is not sentinel:
            return cache
        result = func(instance)
        setattr(instance, cached_name, result)
        return result

return property(inner)

# Python 3.10 changed representation of enums. We use well-defined object
# representation and string representation from Python 3.9.
class Enum(enum.Enum):
    def __repr__(self) -> str:
        return f"<{self.__class__.__name__}.{self._name_}: {self._value_!r}>"

def __str__(self) -> str:
        return f"{self.__class__.__name__}.{self._name_}"

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-08-05 08:25:28
..	dir	-	root/root	0755	2025-11-12 12:10:09
__pycache__	dir	-	root/root	0755	2025-08-05 08:25:42
hazmat	dir	-	root/root	0755	2025-08-05 08:25:28
x509	dir	-	root/root	0755	2025-08-05 08:25:28
__about__.py	text/x-script.python	445 B	root/root	0644	2025-07-04 01:31:01
__init__.py	text/x-script.python	364 B	root/root	0644	2025-07-04 01:31:01
exceptions.py	text/x-script.python	1.06 KB	root/root	0644	2025-07-04 01:31:01
fernet.py	text/x-script.python	6.54 KB	root/root	0644	2025-07-04 01:31:01
py.typed	application/x-empty	0 B	root/root	0644	2025-07-04 01:31:01
utils.py	text/x-script.python	3.83 KB	root/root	0644	2025-07-04 01:31:01

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