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# -*- coding: utf-8 -*-
"""
oauthlib.utils
~~~~~~~~~~~~~~
This module contains utility methods used by various parts of the OAuth
spec.
"""
from __future__ import absolute_import, unicode_literals
from oauthlib.common import bytes_type, quote, unicode_type, unquote
try:
import urllib2
except ImportError:
import urllib.request as urllib2
UNICODE_ASCII_CHARACTER_SET = ('abcdefghijklmnopqrstuvwxyz'
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
'0123456789')
def filter_params(target):
"""Decorator which filters params to remove non-oauth_* parameters
Assumes the decorated method takes a params dict or list of tuples as its
first argument.
"""
def wrapper(params, *args, **kwargs):
params = filter_oauth_params(params)
return target(params, *args, **kwargs)
wrapper.__doc__ = target.__doc__
return wrapper
def filter_oauth_params(params):
"""Removes all non oauth parameters from a dict or a list of params."""
is_oauth = lambda kv: kv[0].startswith("oauth_")
if isinstance(params, dict):
return list(filter(is_oauth, list(params.items())))
else:
return list(filter(is_oauth, params))
def escape(u):
"""Escape a unicode string in an OAuth-compatible fashion.
Per `section 3.6`_ of the spec.
.. _`section 3.6`: https://tools.ietf.org/html/rfc5849#section-3.6
"""
if not isinstance(u, unicode_type):
raise ValueError('Only unicode objects are escapable. ' +
'Got %r of type %s.' % (u, type(u)))
# Letters, digits, and the characters '_.-' are already treated as safe
# by urllib.quote(). We need to add '~' to fully support rfc5849.
return quote(u, safe=b'~')
def unescape(u):
if not isinstance(u, unicode_type):
raise ValueError('Only unicode objects are unescapable.')
return unquote(u)
def parse_keqv_list(l):
"""A unicode-safe version of urllib2.parse_keqv_list"""
# With Python 2.6, parse_http_list handles unicode fine
return urllib2.parse_keqv_list(l)
def parse_http_list(u):
"""A unicode-safe version of urllib2.parse_http_list"""
# With Python 2.6, parse_http_list handles unicode fine
return urllib2.parse_http_list(u)
def parse_authorization_header(authorization_header):
"""Parse an OAuth authorization header into a list of 2-tuples"""
auth_scheme = 'OAuth '.lower()
if authorization_header[:len(auth_scheme)].lower().startswith(auth_scheme):
items = parse_http_list(authorization_header[len(auth_scheme):])
try:
return list(parse_keqv_list(items).items())
except (IndexError, ValueError):
pass
raise ValueError('Malformed authorization header')