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# -*- coding: utf-8 -*-
"""
oauthlib.utils
~~~~~~~~~~~~~~
This module contains utility methods used by various parts of the OAuth
spec.
"""
import time
import urllib
from random import getrandbits
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 filter(is_oauth, params.items())
else:
return filter(is_oauth, params)
def utf8_str(s):
"""Convert unicode to utf-8."""
if isinstance(s, unicode):
return s.encode("utf-8")
else:
return str(s)
def generate_timestamp():
"""Get seconds since epoch (UTC).
Per `section 3.3`_ of the spec.
.. _`section 3.3`: http://tools.ietf.org/html/rfc5849#section-3.3
"""
return str(int(time.time()))
def generate_nonce():
"""Generate pseudorandom nonce that is unlikely to repeat.
Per `section 3.3`_ of the spec.
A random 64-bit number is appended to the epoch timestamp for both
randomness and to decrease the likelihood of collisions.
.. _`section 3.3`: http://tools.ietf.org/html/rfc5849#section-3.3
"""
return str(getrandbits(64)) + generate_timestamp()
def escape(s):
"""Escape a string in an OAuth-compatible fashion.
Per `section 3.6`_ of the spec.
:param s: The string to be escaped.
:return: An url encoded string.
.. _`section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6
"""
if not isinstance(s, unicode):
raise ValueError('Only unicode objects are escapable.')
return urllib.quote(s.encode('utf-8'), safe='~')
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