860 lines
28 KiB
Python
860 lines
28 KiB
Python
"""
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The MIT License
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Copyright (c) 2007-2010 Leah Culver, Joe Stump, Mark Paschal, Vic Fryzel
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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"""
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import base64
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import urllib
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import time
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import random
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import urlparse
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import hmac
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import binascii
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import httplib2
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try:
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from urlparse import parse_qs
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parse_qs # placate pyflakes
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except ImportError:
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# fall back for Python 2.5
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from cgi import parse_qs
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try:
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from hashlib import sha1
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sha = sha1
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except ImportError:
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# hashlib was added in Python 2.5
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import sha
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import _version
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__version__ = _version.__version__
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OAUTH_VERSION = '1.0' # Hi Blaine!
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HTTP_METHOD = 'GET'
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SIGNATURE_METHOD = 'PLAINTEXT'
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class Error(RuntimeError):
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"""Generic exception class."""
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def __init__(self, message='OAuth error occurred.'):
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self._message = message
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@property
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def message(self):
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"""A hack to get around the deprecation errors in 2.6."""
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return self._message
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def __str__(self):
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return self._message
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class MissingSignature(Error):
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pass
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def build_authenticate_header(realm=''):
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"""Optional WWW-Authenticate header (401 error)"""
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return {'WWW-Authenticate': 'OAuth realm="%s"' % realm}
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def build_xoauth_string(url, consumer, token=None):
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"""Build an XOAUTH string for use in SMTP/IMPA authentication."""
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request = Request.from_consumer_and_token(consumer, token,
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"GET", url)
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signing_method = SignatureMethod_HMAC_SHA1()
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request.sign_request(signing_method, consumer, token)
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params = []
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for k, v in sorted(request.iteritems()):
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if v is not None:
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params.append('%s="%s"' % (k, escape(v)))
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return "%s %s %s" % ("GET", url, ','.join(params))
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def to_unicode(s):
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""" Convert to unicode, raise exception with instructive error
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message if s is not unicode, ascii, or utf-8. """
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if not isinstance(s, unicode):
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if not isinstance(s, str):
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raise TypeError('You are required to pass either unicode or string here, not: %r (%s)' % (type(s), s))
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try:
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s = s.decode('utf-8')
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except UnicodeDecodeError, le:
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raise TypeError('You are required to pass either a unicode object or a utf-8 string here. You passed a Python string object which contained non-utf-8: %r. The UnicodeDecodeError that resulted from attempting to interpret it as utf-8 was: %s' % (s, le,))
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return s
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def to_utf8(s):
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return to_unicode(s).encode('utf-8')
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def to_unicode_if_string(s):
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if isinstance(s, basestring):
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return to_unicode(s)
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else:
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return s
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def to_utf8_if_string(s):
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if isinstance(s, basestring):
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return to_utf8(s)
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else:
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return s
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def to_unicode_optional_iterator(x):
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"""
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Raise TypeError if x is a str containing non-utf8 bytes or if x is
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an iterable which contains such a str.
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"""
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if isinstance(x, basestring):
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return to_unicode(x)
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try:
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l = list(x)
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except TypeError, e:
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assert 'is not iterable' in str(e)
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return x
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else:
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return [ to_unicode(e) for e in l ]
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def to_utf8_optional_iterator(x):
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"""
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Raise TypeError if x is a str or if x is an iterable which
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contains a str.
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"""
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if isinstance(x, basestring):
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return to_utf8(x)
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try:
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l = list(x)
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except TypeError, e:
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assert 'is not iterable' in str(e)
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return x
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else:
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return [ to_utf8_if_string(e) for e in l ]
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def escape(s):
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"""Escape a URL including any /."""
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return urllib.quote(s.encode('utf-8'), safe='~')
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def generate_timestamp():
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"""Get seconds since epoch (UTC)."""
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return int(time.time())
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def generate_nonce(length=8):
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"""Generate pseudorandom number."""
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return ''.join([str(random.randint(0, 9)) for i in range(length)])
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def generate_verifier(length=8):
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"""Generate pseudorandom number."""
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return ''.join([str(random.randint(0, 9)) for i in range(length)])
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class Consumer(object):
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"""A consumer of OAuth-protected services.
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The OAuth consumer is a "third-party" service that wants to access
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protected resources from an OAuth service provider on behalf of an end
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user. It's kind of the OAuth client.
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Usually a consumer must be registered with the service provider by the
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developer of the consumer software. As part of that process, the service
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provider gives the consumer a *key* and a *secret* with which the consumer
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software can identify itself to the service. The consumer will include its
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key in each request to identify itself, but will use its secret only when
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signing requests, to prove that the request is from that particular
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registered consumer.
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Once registered, the consumer can then use its consumer credentials to ask
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the service provider for a request token, kicking off the OAuth
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authorization process.
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"""
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key = None
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secret = None
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def __init__(self, key, secret):
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self.key = key
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self.secret = secret
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if self.key is None or self.secret is None:
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raise ValueError("Key and secret must be set.")
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def __str__(self):
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data = {'oauth_consumer_key': self.key,
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'oauth_consumer_secret': self.secret}
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return urllib.urlencode(data)
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class Token(object):
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"""An OAuth credential used to request authorization or a protected
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resource.
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Tokens in OAuth comprise a *key* and a *secret*. The key is included in
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requests to identify the token being used, but the secret is used only in
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the signature, to prove that the requester is who the server gave the
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token to.
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When first negotiating the authorization, the consumer asks for a *request
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token* that the live user authorizes with the service provider. The
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consumer then exchanges the request token for an *access token* that can
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be used to access protected resources.
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"""
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key = None
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secret = None
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callback = None
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callback_confirmed = None
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verifier = None
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def __init__(self, key, secret):
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self.key = key
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self.secret = secret
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if self.key is None or self.secret is None:
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raise ValueError("Key and secret must be set.")
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def set_callback(self, callback):
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self.callback = callback
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self.callback_confirmed = 'true'
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def set_verifier(self, verifier=None):
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if verifier is not None:
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self.verifier = verifier
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else:
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self.verifier = generate_verifier()
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def get_callback_url(self):
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if self.callback and self.verifier:
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# Append the oauth_verifier.
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parts = urlparse.urlparse(self.callback)
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scheme, netloc, path, params, query, fragment = parts[:6]
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if query:
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query = '%s&oauth_verifier=%s' % (query, self.verifier)
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else:
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query = 'oauth_verifier=%s' % self.verifier
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return urlparse.urlunparse((scheme, netloc, path, params,
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query, fragment))
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return self.callback
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def to_string(self):
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"""Returns this token as a plain string, suitable for storage.
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The resulting string includes the token's secret, so you should never
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send or store this string where a third party can read it.
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"""
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data = {
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'oauth_token': self.key,
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'oauth_token_secret': self.secret,
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}
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if self.callback_confirmed is not None:
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data['oauth_callback_confirmed'] = self.callback_confirmed
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return urllib.urlencode(data)
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@staticmethod
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def from_string(s):
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"""Deserializes a token from a string like one returned by
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`to_string()`."""
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if not len(s):
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raise ValueError("Invalid parameter string.")
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params = parse_qs(s, keep_blank_values=False)
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if not len(params):
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raise ValueError("Invalid parameter string.")
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try:
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key = params['oauth_token'][0]
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except Exception:
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raise ValueError("'oauth_token' not found in OAuth request.")
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try:
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secret = params['oauth_token_secret'][0]
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except Exception:
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raise ValueError("'oauth_token_secret' not found in "
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"OAuth request.")
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token = Token(key, secret)
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try:
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token.callback_confirmed = params['oauth_callback_confirmed'][0]
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except KeyError:
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pass # 1.0, no callback confirmed.
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return token
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def __str__(self):
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return self.to_string()
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def setter(attr):
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name = attr.__name__
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def getter(self):
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try:
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return self.__dict__[name]
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except KeyError:
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raise AttributeError(name)
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def deleter(self):
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del self.__dict__[name]
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return property(getter, attr, deleter)
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class Request(dict):
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"""The parameters and information for an HTTP request, suitable for
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authorizing with OAuth credentials.
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When a consumer wants to access a service's protected resources, it does
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so using a signed HTTP request identifying itself (the consumer) with its
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key, and providing an access token authorized by the end user to access
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those resources.
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"""
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version = OAUTH_VERSION
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def __init__(self, method=HTTP_METHOD, url=None, parameters=None,
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body='', is_form_encoded=False):
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if url is not None:
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self.url = to_unicode(url)
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self.method = method
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if parameters is not None:
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for k, v in parameters.iteritems():
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k = to_unicode(k)
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v = to_unicode_optional_iterator(v)
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self[k] = v
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self.body = body
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self.is_form_encoded = is_form_encoded
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@setter
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def url(self, value):
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self.__dict__['url'] = value
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if value is not None:
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scheme, netloc, path, params, query, fragment = urlparse.urlparse(value)
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# Exclude default port numbers.
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if scheme == 'http' and netloc[-3:] == ':80':
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netloc = netloc[:-3]
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elif scheme == 'https' and netloc[-4:] == ':443':
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netloc = netloc[:-4]
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if scheme not in ('http', 'https'):
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raise ValueError("Unsupported URL %s (%s)." % (value, scheme))
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# Normalized URL excludes params, query, and fragment.
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self.normalized_url = urlparse.urlunparse((scheme, netloc, path, None, None, None))
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else:
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self.normalized_url = None
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self.__dict__['url'] = None
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@setter
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def method(self, value):
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self.__dict__['method'] = value.upper()
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def _get_timestamp_nonce(self):
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return self['oauth_timestamp'], self['oauth_nonce']
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def get_nonoauth_parameters(self):
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"""Get any non-OAuth parameters."""
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return dict([(k, v) for k, v in self.iteritems()
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if not k.startswith('oauth_')])
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def to_header(self, realm=''):
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"""Serialize as a header for an HTTPAuth request."""
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oauth_params = ((k, v) for k, v in self.items()
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if k.startswith('oauth_'))
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stringy_params = ((k, escape(str(v))) for k, v in oauth_params)
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header_params = ('%s="%s"' % (k, v) for k, v in stringy_params)
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params_header = ', '.join(header_params)
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auth_header = 'OAuth realm="%s"' % realm
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if params_header:
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auth_header = "%s, %s" % (auth_header, params_header)
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return {'Authorization': auth_header}
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def to_postdata(self):
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"""Serialize as post data for a POST request."""
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d = {}
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for k, v in self.iteritems():
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d[k.encode('utf-8')] = to_utf8_optional_iterator(v)
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# tell urlencode to deal with sequence values and map them correctly
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# to resulting querystring. for example self["k"] = ["v1", "v2"] will
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# result in 'k=v1&k=v2' and not k=%5B%27v1%27%2C+%27v2%27%5D
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return urllib.urlencode(d, True).replace('+', '%20')
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def to_url(self):
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"""Serialize as a URL for a GET request."""
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base_url = urlparse.urlparse(self.url)
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try:
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query = base_url.query
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except AttributeError:
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# must be python <2.5
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query = base_url[4]
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query = parse_qs(query)
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for k, v in self.items():
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query.setdefault(k, []).append(v)
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try:
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scheme = base_url.scheme
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netloc = base_url.netloc
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path = base_url.path
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params = base_url.params
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fragment = base_url.fragment
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except AttributeError:
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# must be python <2.5
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scheme = base_url[0]
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netloc = base_url[1]
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path = base_url[2]
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params = base_url[3]
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fragment = base_url[5]
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url = (scheme, netloc, path, params,
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urllib.urlencode(query, True), fragment)
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return urlparse.urlunparse(url)
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def get_parameter(self, parameter):
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ret = self.get(parameter)
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if ret is None:
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raise Error('Parameter not found: %s' % parameter)
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return ret
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def get_normalized_parameters(self):
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"""Return a string that contains the parameters that must be signed."""
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items = []
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for key, value in self.iteritems():
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if key == 'oauth_signature':
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continue
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# 1.0a/9.1.1 states that kvp must be sorted by key, then by value,
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# so we unpack sequence values into multiple items for sorting.
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if isinstance(value, basestring):
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items.append((to_utf8_if_string(key), to_utf8(value)))
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else:
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try:
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value = list(value)
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except TypeError, e:
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assert 'is not iterable' in str(e)
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items.append((to_utf8_if_string(key), to_utf8_if_string(value)))
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else:
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items.extend((to_utf8_if_string(key), to_utf8_if_string(item)) for item in value)
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# Include any query string parameters from the provided URL
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query = urlparse.urlparse(self.url)[4]
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url_items = self._split_url_string(query).items()
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url_items = [(to_utf8(k), to_utf8(v)) for k, v in url_items if k != 'oauth_signature' ]
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items.extend(url_items)
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items.sort()
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encoded_str = urllib.urlencode(items)
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# Encode signature parameters per Oauth Core 1.0 protocol
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# spec draft 7, section 3.6
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# (http://tools.ietf.org/html/draft-hammer-oauth-07#section-3.6)
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# Spaces must be encoded with "%20" instead of "+"
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return encoded_str.replace('+', '%20').replace('%7E', '~')
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def sign_request(self, signature_method, consumer, token):
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"""Set the signature parameter to the result of sign."""
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if not self.is_form_encoded:
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# according to
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# http://oauth.googlecode.com/svn/spec/ext/body_hash/1.0/oauth-bodyhash.html
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# section 4.1.1 "OAuth Consumers MUST NOT include an
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# oauth_body_hash parameter on requests with form-encoded
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# request bodies."
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self['oauth_body_hash'] = base64.b64encode(sha(self.body).digest())
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if 'oauth_consumer_key' not in self:
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self['oauth_consumer_key'] = consumer.key
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if token and 'oauth_token' not in self:
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self['oauth_token'] = token.key
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self['oauth_signature_method'] = signature_method.name
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self['oauth_signature'] = signature_method.sign(self, consumer, token)
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@classmethod
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def make_timestamp(cls):
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"""Get seconds since epoch (UTC)."""
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return str(int(time.time()))
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@classmethod
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def make_nonce(cls):
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"""Generate pseudorandom number."""
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return str(random.randint(0, 100000000))
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@classmethod
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def from_request(cls, http_method, http_url, headers=None, parameters=None,
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query_string=None):
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"""Combines multiple parameter sources."""
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if parameters is None:
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parameters = {}
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# Headers
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if headers and 'Authorization' in headers:
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auth_header = headers['Authorization']
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# Check that the authorization header is OAuth.
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if auth_header[:6] == 'OAuth ':
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auth_header = auth_header[6:]
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try:
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# Get the parameters from the header.
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header_params = cls._split_header(auth_header)
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parameters.update(header_params)
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except:
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raise Error('Unable to parse OAuth parameters from '
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'Authorization header.')
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# GET or POST query string.
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if query_string:
|
|
query_params = cls._split_url_string(query_string)
|
|
parameters.update(query_params)
|
|
|
|
# URL parameters.
|
|
param_str = urlparse.urlparse(http_url)[4] # query
|
|
url_params = cls._split_url_string(param_str)
|
|
parameters.update(url_params)
|
|
|
|
if parameters:
|
|
return cls(http_method, http_url, parameters)
|
|
|
|
return None
|
|
|
|
@classmethod
|
|
def from_consumer_and_token(cls, consumer, token=None,
|
|
http_method=HTTP_METHOD, http_url=None, parameters=None,
|
|
body='', is_form_encoded=False):
|
|
if not parameters:
|
|
parameters = {}
|
|
|
|
defaults = {
|
|
'oauth_consumer_key': consumer.key,
|
|
'oauth_timestamp': cls.make_timestamp(),
|
|
'oauth_nonce': cls.make_nonce(),
|
|
'oauth_version': cls.version,
|
|
}
|
|
|
|
defaults.update(parameters)
|
|
parameters = defaults
|
|
|
|
if token:
|
|
parameters['oauth_token'] = token.key
|
|
if token.verifier:
|
|
parameters['oauth_verifier'] = token.verifier
|
|
|
|
return Request(http_method, http_url, parameters, body=body,
|
|
is_form_encoded=is_form_encoded)
|
|
|
|
@classmethod
|
|
def from_token_and_callback(cls, token, callback=None,
|
|
http_method=HTTP_METHOD, http_url=None, parameters=None):
|
|
|
|
if not parameters:
|
|
parameters = {}
|
|
|
|
parameters['oauth_token'] = token.key
|
|
|
|
if callback:
|
|
parameters['oauth_callback'] = callback
|
|
|
|
return cls(http_method, http_url, parameters)
|
|
|
|
@staticmethod
|
|
def _split_header(header):
|
|
"""Turn Authorization: header into parameters."""
|
|
params = {}
|
|
parts = header.split(',')
|
|
for param in parts:
|
|
# Ignore realm parameter.
|
|
if param.find('realm') > -1:
|
|
continue
|
|
# Remove whitespace.
|
|
param = param.strip()
|
|
# Split key-value.
|
|
param_parts = param.split('=', 1)
|
|
# Remove quotes and unescape the value.
|
|
params[param_parts[0]] = urllib.unquote(param_parts[1].strip('\"'))
|
|
return params
|
|
|
|
@staticmethod
|
|
def _split_url_string(param_str):
|
|
"""Turn URL string into parameters."""
|
|
parameters = parse_qs(param_str.encode('utf-8'), keep_blank_values=True)
|
|
for k, v in parameters.iteritems():
|
|
parameters[k] = urllib.unquote(v[0])
|
|
return parameters
|
|
|
|
|
|
class Client(httplib2.Http):
|
|
"""OAuthClient is a worker to attempt to execute a request."""
|
|
|
|
def __init__(self, consumer, token=None, cache=None, timeout=None,
|
|
proxy_info=None):
|
|
|
|
if consumer is not None and not isinstance(consumer, Consumer):
|
|
raise ValueError("Invalid consumer.")
|
|
|
|
if token is not None and not isinstance(token, Token):
|
|
raise ValueError("Invalid token.")
|
|
|
|
self.consumer = consumer
|
|
self.token = token
|
|
self.method = SignatureMethod_HMAC_SHA1()
|
|
|
|
httplib2.Http.__init__(self, cache=cache, timeout=timeout, proxy_info=proxy_info)
|
|
|
|
def set_signature_method(self, method):
|
|
if not isinstance(method, SignatureMethod):
|
|
raise ValueError("Invalid signature method.")
|
|
|
|
self.method = method
|
|
|
|
def request(self, uri, method="GET", body='', headers=None,
|
|
redirections=httplib2.DEFAULT_MAX_REDIRECTS, connection_type=None):
|
|
DEFAULT_POST_CONTENT_TYPE = 'application/x-www-form-urlencoded'
|
|
|
|
if not isinstance(headers, dict):
|
|
headers = {}
|
|
|
|
if method == "POST":
|
|
headers['Content-Type'] = headers.get('Content-Type',
|
|
DEFAULT_POST_CONTENT_TYPE)
|
|
|
|
is_form_encoded = \
|
|
headers.get('Content-Type') == 'application/x-www-form-urlencoded'
|
|
|
|
if is_form_encoded and body:
|
|
parameters = parse_qs(body)
|
|
else:
|
|
parameters = None
|
|
|
|
req = Request.from_consumer_and_token(self.consumer,
|
|
token=self.token, http_method=method, http_url=uri,
|
|
parameters=parameters, body=body, is_form_encoded=is_form_encoded)
|
|
|
|
req.sign_request(self.method, self.consumer, self.token)
|
|
|
|
schema, rest = urllib.splittype(uri)
|
|
if rest.startswith('//'):
|
|
hierpart = '//'
|
|
else:
|
|
hierpart = ''
|
|
host, rest = urllib.splithost(rest)
|
|
|
|
realm = schema + ':' + hierpart + host
|
|
|
|
if is_form_encoded:
|
|
body = req.to_postdata()
|
|
elif method == "GET":
|
|
uri = req.to_url()
|
|
else:
|
|
headers.update(req.to_header(realm=realm))
|
|
|
|
return httplib2.Http.request(self, uri, method=method, body=body,
|
|
headers=headers, redirections=redirections,
|
|
connection_type=connection_type)
|
|
|
|
|
|
class Server(object):
|
|
"""A skeletal implementation of a service provider, providing protected
|
|
resources to requests from authorized consumers.
|
|
|
|
This class implements the logic to check requests for authorization. You
|
|
can use it with your web server or web framework to protect certain
|
|
resources with OAuth.
|
|
"""
|
|
|
|
timestamp_threshold = 300 # In seconds, five minutes.
|
|
version = OAUTH_VERSION
|
|
signature_methods = None
|
|
|
|
def __init__(self, signature_methods=None):
|
|
self.signature_methods = signature_methods or {}
|
|
|
|
def add_signature_method(self, signature_method):
|
|
self.signature_methods[signature_method.name] = signature_method
|
|
return self.signature_methods
|
|
|
|
def verify_request(self, request, consumer, token):
|
|
"""Verifies an api call and checks all the parameters."""
|
|
|
|
self._check_version(request)
|
|
self._check_signature(request, consumer, token)
|
|
parameters = request.get_nonoauth_parameters()
|
|
return parameters
|
|
|
|
def build_authenticate_header(self, realm=''):
|
|
"""Optional support for the authenticate header."""
|
|
return {'WWW-Authenticate': 'OAuth realm="%s"' % realm}
|
|
|
|
def _check_version(self, request):
|
|
"""Verify the correct version of the request for this server."""
|
|
version = self._get_version(request)
|
|
if version and version != self.version:
|
|
raise Error('OAuth version %s not supported.' % str(version))
|
|
|
|
def _get_version(self, request):
|
|
"""Return the version of the request for this server."""
|
|
try:
|
|
version = request.get_parameter('oauth_version')
|
|
except:
|
|
version = OAUTH_VERSION
|
|
|
|
return version
|
|
|
|
def _get_signature_method(self, request):
|
|
"""Figure out the signature with some defaults."""
|
|
try:
|
|
signature_method = request.get_parameter('oauth_signature_method')
|
|
except:
|
|
signature_method = SIGNATURE_METHOD
|
|
|
|
try:
|
|
# Get the signature method object.
|
|
signature_method = self.signature_methods[signature_method]
|
|
except:
|
|
signature_method_names = ', '.join(self.signature_methods.keys())
|
|
raise Error('Signature method %s not supported try one of the following: %s' % (signature_method, signature_method_names))
|
|
|
|
return signature_method
|
|
|
|
def _get_verifier(self, request):
|
|
return request.get_parameter('oauth_verifier')
|
|
|
|
def _check_signature(self, request, consumer, token):
|
|
timestamp, nonce = request._get_timestamp_nonce()
|
|
self._check_timestamp(timestamp)
|
|
signature_method = self._get_signature_method(request)
|
|
|
|
try:
|
|
signature = request.get_parameter('oauth_signature')
|
|
except:
|
|
raise MissingSignature('Missing oauth_signature.')
|
|
|
|
# Validate the signature.
|
|
valid = signature_method.check(request, consumer, token, signature)
|
|
|
|
if not valid:
|
|
key, base = signature_method.signing_base(request, consumer, token)
|
|
|
|
raise Error('Invalid signature. Expected signature base '
|
|
'string: %s' % base)
|
|
|
|
def _check_timestamp(self, timestamp):
|
|
"""Verify that timestamp is recentish."""
|
|
timestamp = int(timestamp)
|
|
now = int(time.time())
|
|
lapsed = now - timestamp
|
|
if lapsed > self.timestamp_threshold:
|
|
raise Error('Expired timestamp: given %d and now %s has a '
|
|
'greater difference than threshold %d' % (timestamp, now,
|
|
self.timestamp_threshold))
|
|
|
|
|
|
class SignatureMethod(object):
|
|
"""A way of signing requests.
|
|
|
|
The OAuth protocol lets consumers and service providers pick a way to sign
|
|
requests. This interface shows the methods expected by the other `oauth`
|
|
modules for signing requests. Subclass it and implement its methods to
|
|
provide a new way to sign requests.
|
|
"""
|
|
|
|
def signing_base(self, request, consumer, token):
|
|
"""Calculates the string that needs to be signed.
|
|
|
|
This method returns a 2-tuple containing the starting key for the
|
|
signing and the message to be signed. The latter may be used in error
|
|
messages to help clients debug their software.
|
|
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def sign(self, request, consumer, token):
|
|
"""Returns the signature for the given request, based on the consumer
|
|
and token also provided.
|
|
|
|
You should use your implementation of `signing_base()` to build the
|
|
message to sign. Otherwise it may be less useful for debugging.
|
|
|
|
"""
|
|
raise NotImplementedError
|
|
|
|
def check(self, request, consumer, token, signature):
|
|
"""Returns whether the given signature is the correct signature for
|
|
the given consumer and token signing the given request."""
|
|
built = self.sign(request, consumer, token)
|
|
return built == signature
|
|
|
|
|
|
class SignatureMethod_HMAC_SHA1(SignatureMethod):
|
|
name = 'HMAC-SHA1'
|
|
|
|
def signing_base(self, request, consumer, token):
|
|
if not hasattr(request, 'normalized_url') or request.normalized_url is None:
|
|
raise ValueError("Base URL for request is not set.")
|
|
|
|
sig = (
|
|
escape(request.method),
|
|
escape(request.normalized_url),
|
|
escape(request.get_normalized_parameters()),
|
|
)
|
|
|
|
key = '%s&' % escape(consumer.secret)
|
|
if token:
|
|
key += escape(token.secret)
|
|
raw = '&'.join(sig)
|
|
return key, raw
|
|
|
|
def sign(self, request, consumer, token):
|
|
"""Builds the base signature string."""
|
|
key, raw = self.signing_base(request, consumer, token)
|
|
|
|
hashed = hmac.new(key, raw, sha)
|
|
|
|
# Calculate the digest base 64.
|
|
return binascii.b2a_base64(hashed.digest())[:-1]
|
|
|
|
|
|
class SignatureMethod_PLAINTEXT(SignatureMethod):
|
|
|
|
name = 'PLAINTEXT'
|
|
|
|
def signing_base(self, request, consumer, token):
|
|
"""Concatenates the consumer key and secret with the token's
|
|
secret."""
|
|
sig = '%s&' % escape(consumer.secret)
|
|
if token:
|
|
sig = sig + escape(token.secret)
|
|
return sig, sig
|
|
|
|
def sign(self, request, consumer, token):
|
|
key, raw = self.signing_base(request, consumer, token)
|
|
return raw
|