Файловый менеджер - Редактировать - /var/opt/nydus/ops/shortuuid/main.py
Назад
"""Concise UUID generation.""" import math import secrets import uuid as _uu from typing import List from typing import Optional def int_to_string( number: int, alphabet: List[str], padding: Optional[int] = None ) -> str: """ Convert a number to a string, using the given alphabet. The output has the most significant digit first. """ output = "" alpha_len = len(alphabet) while number: number, digit = divmod(number, alpha_len) output += alphabet[digit] if padding: remainder = max(padding - len(output), 0) output = output + alphabet[0] * remainder return output[::-1] def string_to_int(string: str, alphabet: List[str]) -> int: """ Convert a string to a number, using the given alphabet. The input is assumed to have the most significant digit first. """ number = 0 alpha_len = len(alphabet) for char in string: number = number * alpha_len + alphabet.index(char) return number class ShortUUID(object): def __init__(self, alphabet: Optional[str] = None) -> None: if alphabet is None: alphabet = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ" "abcdefghijkmnopqrstuvwxyz" self.set_alphabet(alphabet) @property def _length(self) -> int: """Return the necessary length to fit the entire UUID given the current alphabet.""" return int(math.ceil(math.log(2**128, self._alpha_len))) def encode(self, uuid: _uu.UUID, pad_length: Optional[int] = None) -> str: """ Encode a UUID into a string (LSB first) according to the alphabet. If leftmost (MSB) bits are 0, the string might be shorter. """ if not isinstance(uuid, _uu.UUID): raise ValueError("Input `uuid` must be a UUID object.") if pad_length is None: pad_length = self._length return int_to_string(uuid.int, self._alphabet, padding=pad_length) def decode(self, string: str, legacy: bool = False) -> _uu.UUID: """ Decode a string according to the current alphabet into a UUID. Raises ValueError when encountering illegal characters or a too-long string. If string too short, fills leftmost (MSB) bits with 0. Pass `legacy=True` if your UUID was encoded with a ShortUUID version prior to 1.0.0. """ if not isinstance(string, str): raise ValueError("Input `string` must be a str.") if legacy: string = string[::-1] return _uu.UUID(int=string_to_int(string, self._alphabet)) def uuid(self, name: Optional[str] = None, pad_length: Optional[int] = None) -> str: """ Generate and return a UUID. If the name parameter is provided, set the namespace to the provided name and generate a UUID. """ if pad_length is None: pad_length = self._length # If no name is given, generate a random UUID. if name is None: u = _uu.uuid4() elif name.lower().startswith(("http://", "https://")): u = _uu.uuid5(_uu.NAMESPACE_URL, name) else: u = _uu.uuid5(_uu.NAMESPACE_DNS, name) return self.encode(u, pad_length) def random(self, length: Optional[int] = None) -> str: """Generate and return a cryptographically secure short random string of `length`.""" if length is None: length = self._length return "".join(secrets.choice(self._alphabet) for _ in range(length)) def get_alphabet(self) -> str: """Return the current alphabet used for new UUIDs.""" return "".join(self._alphabet) def set_alphabet(self, alphabet: str) -> None: """Set the alphabet to be used for new UUIDs.""" # Turn the alphabet into a set and sort it to prevent duplicates # and ensure reproducibility. new_alphabet = list(sorted(set(alphabet))) if len(new_alphabet) > 1: self._alphabet = new_alphabet self._alpha_len = len(self._alphabet) else: raise ValueError("Alphabet with more than " "one unique symbols required.") def encoded_length(self, num_bytes: int = 16) -> int: """Return the string length of the shortened UUID.""" factor = math.log(256) / math.log(self._alpha_len) return int(math.ceil(factor * num_bytes)) # For backwards compatibility _global_instance = ShortUUID() encode = _global_instance.encode decode = _global_instance.decode uuid = _global_instance.uuid random = _global_instance.random get_alphabet = _global_instance.get_alphabet set_alphabet = _global_instance.set_alphabet
| ver. 1.4 |
Github
|
.
| PHP 8.0.30 | Генерация страницы: 0 |
proxy
|
phpinfo
|
Настройка