142 lines
3.8 KiB
Python
142 lines
3.8 KiB
Python
# Copyright 2013 by Rackspace Hosting, 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.
|
|
|
|
import datetime
|
|
import functools
|
|
import inspect
|
|
import warnings
|
|
|
|
from falcon.util import uri
|
|
|
|
|
|
__all__ = (
|
|
'deprecated',
|
|
'dt_to_http',
|
|
'http_date_to_dt',
|
|
'to_query_str',
|
|
'percent_escape',
|
|
'percent_unescape',
|
|
)
|
|
|
|
|
|
# NOTE(kgriffs): We don't want our deprecations to be ignored by default,
|
|
# so create our own type.
|
|
#
|
|
# TODO(kgriffs): Revisit this decision if users complain.
|
|
class DeprecatedWarning(UserWarning):
|
|
pass
|
|
|
|
|
|
def deprecated(instructions):
|
|
"""Flags a method as deprecated.
|
|
|
|
Args:
|
|
instructions: A human-friendly string of instructions, such
|
|
as: 'Please migrate to add_proxy(...) ASAP.'
|
|
"""
|
|
|
|
def decorator(func):
|
|
'''This is a decorator which can be used to mark functions
|
|
as deprecated. It will result in a warning being emitted
|
|
when the function is used.'''
|
|
@functools.wraps(func)
|
|
def wrapper(*args, **kwargs):
|
|
message = 'Call to deprecated function {0}(...). {1}'.format(
|
|
func.__name__,
|
|
instructions)
|
|
|
|
frame = inspect.currentframe().f_back
|
|
|
|
warnings.warn_explicit(message,
|
|
category=DeprecatedWarning,
|
|
filename=inspect.getfile(frame.f_code),
|
|
lineno=frame.f_lineno)
|
|
|
|
return func(*args, **kwargs)
|
|
|
|
return wrapper
|
|
|
|
return decorator
|
|
|
|
|
|
def dt_to_http(dt):
|
|
"""Converts a datetime instance to an HTTP date string.
|
|
|
|
Args:
|
|
dt: A datetime object, assumed to be UTC
|
|
|
|
Returns:
|
|
An HTTP date string, e.g., "Tue, 15 Nov 1994 12:45:26 GMT". See
|
|
also: http://goo.gl/R7So4
|
|
"""
|
|
|
|
# Tue, 15 Nov 1994 12:45:26 GMT
|
|
return dt.strftime('%a, %d %b %Y %H:%M:%S GMT')
|
|
|
|
|
|
def http_date_to_dt(http_date):
|
|
"""Converts an HTTP date string to a datetime instance.
|
|
|
|
Args:
|
|
http_date: An HTTP date string, e.g., "Tue, 15 Nov 1994 12:45:26 GMT".
|
|
|
|
Returns:
|
|
A UTC datetime instance corresponding to the given HTTP date.
|
|
"""
|
|
|
|
return datetime.datetime.strptime(
|
|
http_date, '%a, %d %b %Y %H:%M:%S %Z')
|
|
|
|
|
|
def to_query_str(params):
|
|
"""Converts a dict of params to an actual query string.
|
|
|
|
Args:
|
|
params: dict of simple key-value types, where key is a string and
|
|
value is a string or something that can be converted into a
|
|
string. If value is a list, it will be converted to a comma-
|
|
delimited string (e.g., thing=1,2,3)
|
|
|
|
Returns:
|
|
A URI query string starting with '?', or and empty string if there
|
|
are no params (the dict is empty).
|
|
"""
|
|
|
|
if not params:
|
|
return ''
|
|
|
|
# PERF: This is faster than a list comprehension and join, mainly
|
|
# because it allows us to inline the value transform.
|
|
query_str = '?'
|
|
for k, v in params.items():
|
|
if v is True:
|
|
v = 'true'
|
|
elif v is False:
|
|
v = 'false'
|
|
elif isinstance(v, list):
|
|
v = ','.join(map(str, v))
|
|
else:
|
|
v = str(v)
|
|
|
|
query_str += k + '=' + v + '&'
|
|
|
|
return query_str[:-1]
|
|
|
|
|
|
# TODO(kgriffs): Remove this alias in Falcon v0.2.0
|
|
percent_escape = uri.encode
|
|
|
|
# TODO(kgriffs): Remove this alias in Falcon v0.2.0
|
|
percent_unescape = uri.decode
|