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_helpers.py
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_helpers.py
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# Copyright 2015 Google Inc. All rights reserved.
#
# 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.
"""Helper functions for commonly used utilities."""
import base64
import functools
import inspect
import json
import logging
import os
import warnings
import six
from six.moves import urllib
__author__ = (
'rafek@google.com (Rafe Kaplan)',
'guido@google.com (Guido van Rossum)',
)
logger = logging.getLogger(__name__)
POSITIONAL_WARNING = 'WARNING'
POSITIONAL_EXCEPTION = 'EXCEPTION'
POSITIONAL_IGNORE = 'IGNORE'
POSITIONAL_SET = frozenset([POSITIONAL_WARNING, POSITIONAL_EXCEPTION,
POSITIONAL_IGNORE])
positional_parameters_enforcement = POSITIONAL_WARNING
_SYM_LINK_MESSAGE = 'File: {0}: Is a symbolic link.'
_IS_DIR_MESSAGE = '{0}: Is a directory'
_MISSING_FILE_MESSAGE = 'Cannot access {0}: No such file or directory'
def positional(max_positional_args):
"""A decorator to declare that only the first N arguments my be positional.
This decorator makes it easy to support Python 3 style keyword-only
parameters. For example, in Python 3 it is possible to write::
def fn(pos1, *, kwonly1=None, kwonly1=None):
...
All named parameters after ``*`` must be a keyword::
fn(10, 'kw1', 'kw2') # Raises exception.
fn(10, kwonly1='kw1') # Ok.
Example
^^^^^^^
To define a function like above, do::
@positional(1)
def fn(pos1, kwonly1=None, kwonly2=None):
...
If no default value is provided to a keyword argument, it becomes a
required keyword argument::
@positional(0)
def fn(required_kw):
...
This must be called with the keyword parameter::
fn() # Raises exception.
fn(10) # Raises exception.
fn(required_kw=10) # Ok.
When defining instance or class methods always remember to account for
``self`` and ``cls``::
class MyClass(object):
@positional(2)
def my_method(self, pos1, kwonly1=None):
...
@classmethod
@positional(2)
def my_method(cls, pos1, kwonly1=None):
...
The positional decorator behavior is controlled by
``_helpers.positional_parameters_enforcement``, which may be set to
``POSITIONAL_EXCEPTION``, ``POSITIONAL_WARNING`` or
``POSITIONAL_IGNORE`` to raise an exception, log a warning, or do
nothing, respectively, if a declaration is violated.
Args:
max_positional_arguments: Maximum number of positional arguments. All
parameters after the this index must be
keyword only.
Returns:
A decorator that prevents using arguments after max_positional_args
from being used as positional parameters.
Raises:
TypeError: if a key-word only argument is provided as a positional
parameter, but only if
_helpers.positional_parameters_enforcement is set to
POSITIONAL_EXCEPTION.
"""
def positional_decorator(wrapped):
@functools.wraps(wrapped)
def positional_wrapper(*args, **kwargs):
if len(args) > max_positional_args:
plural_s = ''
if max_positional_args != 1:
plural_s = 's'
message = ('{function}() takes at most {args_max} positional '
'argument{plural} ({args_given} given)'.format(
function=wrapped.__name__,
args_max=max_positional_args,
args_given=len(args),
plural=plural_s))
if positional_parameters_enforcement == POSITIONAL_EXCEPTION:
raise TypeError(message)
elif positional_parameters_enforcement == POSITIONAL_WARNING:
logger.warning(message)
return wrapped(*args, **kwargs)
return positional_wrapper
if isinstance(max_positional_args, six.integer_types):
return positional_decorator
else:
args, _, _, defaults = inspect.getargspec(max_positional_args)
return positional(len(args) - len(defaults))(max_positional_args)
def scopes_to_string(scopes):
"""Converts scope value to a string.
If scopes is a string then it is simply passed through. If scopes is an
iterable then a string is returned that is all the individual scopes
concatenated with spaces.
Args:
scopes: string or iterable of strings, the scopes.
Returns:
The scopes formatted as a single string.
"""
if isinstance(scopes, six.string_types):
return scopes
else:
return ' '.join(scopes)
def string_to_scopes(scopes):
"""Converts stringifed scope value to a list.
If scopes is a list then it is simply passed through. If scopes is an
string then a list of each individual scope is returned.
Args:
scopes: a string or iterable of strings, the scopes.
Returns:
The scopes in a list.
"""
if not scopes:
return []
elif isinstance(scopes, six.string_types):
return scopes.split(' ')
else:
return scopes
def _add_query_parameter(url, name, value):
"""Adds a query parameter to a url.
Replaces the current value if it already exists in the URL.
Args:
url: string, url to add the query parameter to.
name: string, query parameter name.
value: string, query parameter value.
Returns:
Updated query parameter. Does not update the url if value is None.
"""
if value is None:
return url
else:
parsed = list(urllib.parse.urlparse(url))
query = dict(urllib.parse.parse_qsl(parsed[4]))
query[name] = value
parsed[4] = urllib.parse.urlencode(query)
return urllib.parse.urlunparse(parsed)
def validate_file(filename):
if os.path.islink(filename):
raise IOError(_SYM_LINK_MESSAGE.format(filename))
elif os.path.isdir(filename):
raise IOError(_IS_DIR_MESSAGE.format(filename))
elif not os.path.isfile(filename):
warnings.warn(_MISSING_FILE_MESSAGE.format(filename))
def _parse_pem_key(raw_key_input):
"""Identify and extract PEM keys.
Determines whether the given key is in the format of PEM key, and extracts
the relevant part of the key if it is.
Args:
raw_key_input: The contents of a private key file (either PEM or
PKCS12).
Returns:
string, The actual key if the contents are from a PEM file, or
else None.
"""
offset = raw_key_input.find(b'-----BEGIN ')
if offset != -1:
return raw_key_input[offset:]
def _json_encode(data):
return json.dumps(data, separators=(',', ':'))
def _to_bytes(value, encoding='ascii'):
"""Converts a string value to bytes, if necessary.
Unfortunately, ``six.b`` is insufficient for this task since in
Python2 it does not modify ``unicode`` objects.
Args:
value: The string/bytes value to be converted.
encoding: The encoding to use to convert unicode to bytes. Defaults
to "ascii", which will not allow any characters from ordinals
larger than 127. Other useful values are "latin-1", which
which will only allows byte ordinals (up to 255) and "utf-8",
which will encode any unicode that needs to be.
Returns:
The original value converted to bytes (if unicode) or as passed in
if it started out as bytes.
Raises:
ValueError if the value could not be converted to bytes.
"""
result = (value.encode(encoding)
if isinstance(value, six.text_type) else value)
if isinstance(result, six.binary_type):
return result
else:
raise ValueError('{0!r} could not be converted to bytes'.format(value))
def _from_bytes(value):
"""Converts bytes to a string value, if necessary.
Args:
value: The string/bytes value to be converted.
Returns:
The original value converted to unicode (if bytes) or as passed in
if it started out as unicode.
Raises:
ValueError if the value could not be converted to unicode.
"""
result = (value.decode('utf-8')
if isinstance(value, six.binary_type) else value)
if isinstance(result, six.text_type):
return result
else:
raise ValueError(
'{0!r} could not be converted to unicode'.format(value))
def _urlsafe_b64encode(raw_bytes):
raw_bytes = _to_bytes(raw_bytes, encoding='utf-8')
return base64.urlsafe_b64encode(raw_bytes).rstrip(b'=')
def _urlsafe_b64decode(b64string):
# Guard against unicode strings, which base64 can't handle.
b64string = _to_bytes(b64string)
padded = b64string + b'=' * (4 - len(b64string) % 4)
return base64.urlsafe_b64decode(padded)