FeatureEnVi: Visual Analytics for Feature Engineering Using Stepwise Selection and Semi-Automatic Extraction Approaches https://doi.org/10.1109/TVCG.2022.3141040
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FeatureEnVi/backend/venv/lib/python3.7/site-packages/pymongo/saslprep.py

108 lines
4.2 KiB

# Copyright 2016-present MongoDB, Inc.
#
# 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.
"""An implementation of RFC4013 SASLprep."""
from bson.py3compat import text_type as _text_type
try:
import stringprep
except ImportError:
HAVE_STRINGPREP = False
def saslprep(data):
"""SASLprep dummy"""
if isinstance(data, _text_type):
raise TypeError(
"The stringprep module is not available. Usernames and "
"passwords must be ASCII strings.")
return data
else:
HAVE_STRINGPREP = True
import unicodedata
# RFC4013 section 2.3 prohibited output.
_PROHIBITED = (
# A strict reading of RFC 4013 requires table c12 here, but
# characters from it are mapped to SPACE in the Map step. Can
# normalization reintroduce them somehow?
stringprep.in_table_c12,
stringprep.in_table_c21_c22,
stringprep.in_table_c3,
stringprep.in_table_c4,
stringprep.in_table_c5,
stringprep.in_table_c6,
stringprep.in_table_c7,
stringprep.in_table_c8,
stringprep.in_table_c9)
def saslprep(data, prohibit_unassigned_code_points=True):
"""An implementation of RFC4013 SASLprep.
:Parameters:
- `data`: The string to SASLprep. Unicode strings
(python 2.x unicode, 3.x str) are supported. Byte strings
(python 2.x str, 3.x bytes) are ignored.
- `prohibit_unassigned_code_points`: True / False. RFC 3454
and RFCs for various SASL mechanisms distinguish between
`queries` (unassigned code points allowed) and
`stored strings` (unassigned code points prohibited). Defaults
to ``True`` (unassigned code points are prohibited).
:Returns:
The SASLprep'ed version of `data`.
"""
if not isinstance(data, _text_type):
return data
if prohibit_unassigned_code_points:
prohibited = _PROHIBITED + (stringprep.in_table_a1,)
else:
prohibited = _PROHIBITED
# RFC3454 section 2, step 1 - Map
# RFC4013 section 2.1 mappings
# Map Non-ASCII space characters to SPACE (U+0020). Map
# commonly mapped to nothing characters to, well, nothing.
in_table_c12 = stringprep.in_table_c12
in_table_b1 = stringprep.in_table_b1
data = u"".join(
[u"\u0020" if in_table_c12(elt) else elt
for elt in data if not in_table_b1(elt)])
# RFC3454 section 2, step 2 - Normalize
# RFC4013 section 2.2 normalization
data = unicodedata.ucd_3_2_0.normalize('NFKC', data)
in_table_d1 = stringprep.in_table_d1
if in_table_d1(data[0]):
if not in_table_d1(data[-1]):
# RFC3454, Section 6, #3. If a string contains any
# RandALCat character, the first and last characters
# MUST be RandALCat characters.
raise ValueError("SASLprep: failed bidirectional check")
# RFC3454, Section 6, #2. If a string contains any RandALCat
# character, it MUST NOT contain any LCat character.
prohibited = prohibited + (stringprep.in_table_d2,)
else:
# RFC3454, Section 6, #3. Following the logic of #3, if
# the first character is not a RandALCat, no other character
# can be either.
prohibited = prohibited + (in_table_d1,)
# RFC3454 section 2, step 3 and 4 - Prohibit and check bidi
for char in data:
if any(in_table(char) for in_table in prohibited):
raise ValueError(
"SASLprep: failed prohibited character check")
return data