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# Copyright (c) 2012 Mitch Garnaat http://garnaat.org/
# Copyright (c) 2012 Amazon.com, Inc. or its affiliates.
# All Rights Reserved
#
# 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, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing 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 MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR 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 requests.packages.urllib3
import hmac
import base64
from hashlib import sha256
import datetime
try:
from urllib.parse import quote
except ImportError:
from urllib import quote
class SigV2Auth(object):
"""
Sign an Query Signature V2 request.
"""
def __init__(self, credentials, api_version=''):
self.credentials = credentials
self.api_version = api_version
self.hmac = hmac.new(self.credentials.secret_key.encode('utf-8'),
digestmod=sha256)
def calc_signature(self, args):
scheme, host, port = requests.packages.urllib3.get_host(args['url'])
string_to_sign = '%s\n%s\n%s\n' % (args['method'], host, '/')
hmac = self.hmac.copy()
args['params']['SignatureMethod'] = 'HmacSHA256'
if self.credentials.token:
args['params']['SecurityToken'] = self.credentials.token
sorted_params = sorted(args['params'])
pairs = []
for key in sorted_params:
value = args['params'][key]
pairs.append(quote(key, safe='') + '=' +
quote(value, safe='-_~'))
qs = '&'.join(pairs)
string_to_sign += qs
print('string_to_sign')
print(string_to_sign)
hmac.update(string_to_sign.encode('utf-8'))
b64 = base64.b64encode(hmac.digest()).strip().decode('utf-8')
return (qs, b64)
def add_auth(self, args):
args['params']['Action'] = 'DescribeInstances'
args['params']['AWSAccessKeyId'] = self.credentials.access_key
args['params']['SignatureVersion'] = '2'
args['params']['Timestamp'] = datetime.datetime.utcnow().isoformat()
args['params']['Version'] = self.api_version
qs, signature = self.calc_signature(args)
args['params']['Signature'] = signature
if args['method'] == 'POST':
args['data'] = args['params']
args['params'] = {}
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