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"""
websocket - WebSocket client library for Python
Copyright (C) 2010 Hiroki Ohtani(liris)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1335 USA
"""
import six
__all__ = ["NoLock", "validate_utf8", "extract_err_message"]
class NoLock(object):
def __enter__(self):
pass
def __exit__(self, exc_type, exc_value, traceback):
pass
try:
# If wsaccel is available we use compiled routines to validate UTF-8
# strings.
from wsaccel.utf8validator import Utf8Validator
def _validate_utf8(utfbytes):
return Utf8Validator().validate(utfbytes)[0]
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, codep, ch):
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):
state = _UTF8_ACCEPT
codep = 0
for i in utfbytes:
if six.PY2:
i = ord(i)
state, codep = _decode(state, codep, i)
if state == _UTF8_REJECT:
return False
return True
def validate_utf8(utfbytes):
"""
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):
if exception.args:
return exception.args[0]
else:
return None
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