def _parse_from_text(self, principal, realm=None):
r"""
parse individual principal name components from the string
representation of the principal. This is done in three steps:
1.) split the string at the unescaped '@'
2.) unescape any leftover '\@' sequences
3.) split the primary at the unescaped '/'
4.) unescape leftover '\/'
:param principal: unicode representation of the principal name
:param realm: if not None, this realm name will be used instead of the
one parsed from `principal`
:returns: tuple containing the principal name components and realm
"""
principal_name, parsed_realm = parse_princ_name_and_realm(
principal, realm=realm)
(principal_name,) = unescape_seq(u'@', principal_name)
if parsed_realm is not None:
(parsed_realm,) = unescape_seq(u'@', parsed_realm)
name_components = split_principal_name(principal_name)
name_components = unescape_seq(u'/', *name_components)
return name_components, parsed_realm
def unquote_directive_value(value, quote_char):
"""Unquote a directive value
:param value: string to unquote
:param quote_char: character to strip. All escaped occurences of
`quote_char` will be uncescaped during processing
:returns: processed value
"""
unescaped_value = "".join(unescape_seq(quote_char, value))
if (unescaped_value.startswith(quote_char) and
unescaped_value.endswith(quote_char)):
return unescaped_value[1:-1]
return unescaped_value
def unquote_directive_value(value, quote_char):
"""Unquote a directive value
:param value: string to unquote
:param quote_char: character to strip. All escaped occurences of
`quote_char` will be uncescaped during processing
:returns: processed value
"""
unescaped_value = "".join(unescape_seq(quote_char, value))
if (unescaped_value.startswith(quote_char)
and unescaped_value.endswith(quote_char)):
return unescaped_value[1:-1]
return unescaped_value
