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"""
escape/unescape routines available for backends which need
alphanumeric usernames, services, or other values
"""
import string
import re
import sys
LEGAL_CHARS = (
getattr(string, 'letters', None) # Python 2
or getattr(string, 'ascii_letters') # Python 3
) + string.digits
ESCAPE_FMT = "_%02X"
def _escape_char(c):
"Single char escape. Return the char, escaped if not already legal"
if isinstance(c, int):
c = unichr(c)
return c if c in LEGAL_CHARS else ESCAPE_FMT % ord(c)
def escape(value):
"""
Escapes given string so the result consists of alphanumeric chars and
underscore only.
"""
return "".join(_escape_char(c) for c in value.encode('utf-8'))
def _unescape_code(regex_match):
ordinal = int(regex_match.group('code'), 16)
if sys.version_info >= (3,):
return bytes([ordinal])
return chr(ordinal)
def unescape(value):
"""
Inverse of escape.
"""
re_esc = re.compile(
# the pattern must be bytes to operate on bytes
ESCAPE_FMT.replace('%02X', '(?P<code>[0-9A-F]{2})').encode('ascii')
)
return re_esc.sub(_unescape_code, value.encode('ascii')).decode('utf-8')