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#!/usr/bin/env python
#
# Copyright (c) 2013 Martin Abente Lahaye. - tch@sugarlabs.org
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#THE SOFTWARE.
import urllib
import time
import random
import hashlib
import hmac
import binascii
class TwrAccount:
@classmethod
def set_secrets(cls, c_key, c_secret, a_key, a_secret):
cls._consumer_key = c_key
cls._consumer_secret = c_secret
cls._access_key = a_key
cls._access_secret = a_secret
@classmethod
def _oauth_signature(cls, method, url, params):
recipe = (
method,
TwrAccount._percent(url),
TwrAccount._percent(TwrAccount._string_params(params)))
raw = '&'.join(recipe)
key = '%s&%s' % (TwrAccount._percent(cls._consumer_secret),
TwrAccount._percent(cls._access_secret))
hashed = hmac.new(key, raw, hashlib.sha1)
signature = binascii.b2a_base64(hashed.digest())[:-1]
return signature
@classmethod
def authorization_header(cls, method, url, request_params):
oauth_params = {
'oauth_nonce': TwrAccount._nonce(),
'oauth_timestamp': TwrAccount._timestamp(),
'oauth_consumer_key': cls._consumer_key,
'oauth_version': '1.0',
'oauth_token': cls._access_key,
'oauth_signature_method': 'HMAC-SHA1'
}
params = dict(oauth_params.items() + request_params)
params['oauth_signature'] = cls._oauth_signature(method, url, params)
header = 'OAuth %s' % ', '.join(
['%s="%s"' % (k, TwrAccount._percent(v))
for k, v in sorted(params.iteritems())])
return header
@staticmethod
def _percent(string):
return urllib.quote(str(string), safe='~')
@staticmethod
def _utf8(string):
return str(string).encode("utf-8")
@staticmethod
def _nonce(length=8):
return ''.join([str(random.randint(0, 9)) for i in range(length)])
@staticmethod
def _timestamp():
return int(time.time())
@staticmethod
def _string_params(params):
key_values = [(TwrAccount._percent(TwrAccount._utf8(k)),
TwrAccount._percent(TwrAccount._utf8(v)))
for k, v in params.items()]
key_values.sort()
return '&'.join(['%s=%s' % (k, v) for k, v in key_values])
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