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"""
oauthlib.utils
~~~~~~~~~~~~~~
This module contains utility methods used by various parts of the OAuth 2 spec.
"""
import random
import string
import time
import urllib
from urlparse import urlparse, urlunparse, parse_qsl
UNICODE_ASCII_CHARACTER_SET = (string.ascii_letters.decode('ascii') +
string.digits.decode('ascii'))
def add_params_to_qs(query, params):
"""Extend a query with a list of two-tuples.
:param query: Query string.
:param params: List of two-tuples.
:return: extended query
"""
queryparams = parse_qsl(query, keep_blank_values=True)
queryparams.extend(params)
return urlencode(queryparams)
def add_params_to_uri(uri, params):
"""Add a list of two-tuples to the uri query components.
:param uri: Full URI.
:param params: List of two-tuples.
:return: uri with extended query
"""
sch, net, path, par, query, fra = urlparse(uri)
query = add_params_to_qs(query, params)
return urlunparse((sch, net, path, par, query, fra))
def escape(u):
"""Escape a string in an OAuth-compatible fashion.
Per `section 3.6`_ of the spec.
.. _`section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6
"""
if not isinstance(u, unicode):
raise ValueError('Only unicode objects are escapable.')
return urllib.quote(u.encode('utf-8'), safe='~')
def generate_nonce():
"""Generate pseudorandom nonce that is unlikely to repeat.
Per `section 3.2.1`_ of the MAC Access Authentication spec.
A random 64-bit number is appended to the epoch timestamp for both
randomness and to decrease the likelihood of collisions.
.. _`section 3.2.1`: http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1
"""
return unicode(unicode(random.getrandbits(64)) + generate_timestamp())
def generate_timestamp():
"""Get seconds since epoch (UTC).
Per `section 3.2.1`_ of the MAC Access Authentication spec.
.. _`section 3.2.1`: http://tools.ietf.org/html/draft-ietf-oauth-v2-http-mac-01#section-3.2.1
"""
return unicode(int(time.time()))
def generate_token(length=20, chars=UNICODE_ASCII_CHARACTER_SET):
"""Generates a generic OAuth 2 token
According to `section 1.4`_ and `section 1.5` of the spec, the method of token
construction is undefined. This implementation is simply a random selection
of `length` choices from `chars`. SystemRandom is used since it provides
higher entropy than random.choice.
.. _`section 1.4`: http://tools.ietf.org/html/draft-ietf-oauth-v2-25#section-1.4
.. _`section 1.5`: http://tools.ietf.org/html/draft-ietf-oauth-v2-25#section-1.5
"""
rand = random.SystemRandom()
return u''.join(rand.choice(chars) for x in range(length))
def host_from_uri(uri):
"""Extract hostname and port from URI.
Will use default port for HTTP and HTTPS if none is present in the URI.
>>> host_from_uri(u'https://www.example.com/path?query')
u'www.example.com', u'443'
>>> host_from_uri(u'http://www.example.com:8080/path?query')
u'www.example.com', u'8080'
:param uri: Full URI.
:param http_method: HTTP request method.
:return: hostname, port
"""
default_ports = {
u'HTTP' : u'80',
u'HTTPS' : u'443',
}
sch, netloc, path, par, query, fra = urlparse(uri)
if u':' in netloc:
netloc, port = netloc.split(u':', 1)
else:
port = default_ports.get(sch.upper())
return netloc, port
def urlencode(query):
"""Encode a sequence of two-element tuples or dictionary into a URL query string.
Operates using an OAuth-safe escape() method, in contrast to urllib.urlenocde.
"""
# Convert dictionaries to list of tuples
if isinstance(query, dict):
query = query.items()
return "&".join(['='.join([escape(k), escape(v)]) for k, v in query])
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