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98 lines
3.0 KiB
98 lines
3.0 KiB
# -*- coding: utf-8 -*-
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"""
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This code was imported from ldap3, because upstream obviously deprecated this.
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Until I come around finding a better solution, this will stay here.
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All this code was written by people from the ldap3 project and keeps the original license, of course.
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Original header below:
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# Created on 2014.09.08
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#
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# Author: Giovanni Cannata
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#
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# Copyright 2014, 2015, 2016 Giovanni Cannata
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#
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# This file is part of ldap3.
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#
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# ldap3 is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# ldap3 is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with ldap3 in the COPYING and COPYING.LESSER files.
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# If not, see <http://www.gnu.org/licenses/>.
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"""
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from string import hexdigits
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STATE_ANY = 0
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STATE_ESCAPE = 1
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STATE_ESCAPE_HEX = 2
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def escape_attribute_value(attribute_value):
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if not attribute_value:
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return ''
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if attribute_value[0] == '#': # with leading SHARP only pairs of hex characters are valid
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valid_hex = True
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if len(attribute_value) % 2 == 0: # string must be # + HEX HEX (an odd number of chars)
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valid_hex = False
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if valid_hex:
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for c in attribute_value:
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if c not in hexdigits: # allowed only hex digits as per RFC 4514
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valid_hex = False
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break
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if valid_hex:
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return attribute_value
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state = STATE_ANY
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escaped = ''
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tmp_buffer = ''
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for c in attribute_value:
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if state == STATE_ANY:
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if c == '\\':
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state = STATE_ESCAPE
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elif c in '"#+,;<=>\00':
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escaped += '\\' + c
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else:
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escaped += c
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elif state == STATE_ESCAPE:
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if c in hexdigits:
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tmp_buffer = c
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state = STATE_ESCAPE_HEX
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elif c in ' "#+,;<=>\\\00':
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escaped += '\\' + c
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state = STATE_ANY
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else:
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escaped += '\\\\' + c
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elif state == STATE_ESCAPE_HEX:
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if c in hexdigits:
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escaped += '\\' + tmp_buffer + c
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else:
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escaped += '\\\\' + tmp_buffer + c
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tmp_buffer = ''
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state = STATE_ANY
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# final state
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if state == STATE_ESCAPE:
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escaped += '\\\\'
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elif state == STATE_ESCAPE_HEX:
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escaped += '\\\\' + tmp_buffer
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if escaped[0] == ' ': # leading SPACE must be escaped
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escaped = '\\' + escaped
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if escaped[-1] == ' ' and len(escaped) > 1 and escaped[-2] != '\\': # trailing SPACE must be escaped
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escaped = escaped[:-1] + '\\ '
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return escaped
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