from typing import Union """ _url.py websocket - WebSocket client library for Python Copyright 2023 engn33r Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. """ __all__ = ["NoLock", "validate_utf8", "extract_err_message", "extract_error_code"] class NoLock: def __enter__(self) -> None: pass def __exit__(self, exc_type, exc_value, traceback) -> None: pass try: # If wsaccel is available we use compiled routines to validate UTF-8 # strings. from wsaccel.utf8validator import Utf8Validator def _validate_utf8(utfbytes: Union[str, bytes]) -> bool: result: bool = Utf8Validator().validate(utfbytes)[0] return result except ImportError: # UTF-8 validator # python implementation of http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ _UTF8_ACCEPT = 0 _UTF8_REJECT = 12 _UTF8D = [ # The first part of the table maps bytes to character classes that # to reduce the size of the transition table and create bitmasks. 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 3, 3, 11, 6, 6, 6, 5, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, # The second part is a transition table that maps a combination # of a state of the automaton and a character class to a state. 0, 12, 24, 36, 60, 96, 84, 12, 12, 12, 48, 72, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 0, 12, 12, 12, 12, 12, 0, 12, 0, 12, 12, 12, 24, 12, 12, 12, 12, 12, 24, 12, 24, 12, 12, 12, 12, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 12, 12, 12, 12, 36, 12, 36, 12, 12, 12, 36, 12, 12, 12, 12, 12, 36, 12, 36, 12, 12, 12, 36, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, ] def _decode(state: int, codep: int, ch: int) -> tuple: tp = _UTF8D[ch] codep = ( (ch & 0x3F) | (codep << 6) if (state != _UTF8_ACCEPT) else (0xFF >> tp) & ch ) state = _UTF8D[256 + state + tp] return state, codep def _validate_utf8(utfbytes: Union[str, bytes]) -> bool: state = _UTF8_ACCEPT codep = 0 for i in utfbytes: state, codep = _decode(state, codep, int(i)) if state == _UTF8_REJECT: return False return True def validate_utf8(utfbytes: Union[str, bytes]) -> bool: """ validate utf8 byte string. utfbytes: utf byte string to check. return value: if valid utf8 string, return true. Otherwise, return false. """ return _validate_utf8(utfbytes) def extract_err_message(exception: Exception) -> Union[str, None]: if exception.args: exception_message: str = exception.args[0] return exception_message else: return None def extract_error_code(exception: Exception) -> Union[int, None]: if exception.args and len(exception.args) > 1: return exception.args[0] if isinstance(exception.args[0], int) else None