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55 lines
1.8 KiB
55 lines
1.8 KiB
# -*- coding: utf-8 -*-
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# Copyright 2017 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""Utility classes for OAuth 1.0"""
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import hmac
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import time
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import base64
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import random
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import string
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import hashlib
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import urllib.parse
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class OAuthSession():
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"""Minimal wrapper for requests.session objects to support OAuth 1.0"""
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def __init__(self, session, consumer_key, consumer_secret,
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token=None, token_secret=None):
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self.session = session
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self.consumer_secret = consumer_secret
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self.token_secret = token_secret or ""
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self.params = session.params
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self.params["oauth_consumer_key"] = consumer_key
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self.params["oauth_token"] = token
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self.params["oauth_signature_method"] = "HMAC-SHA1"
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self.params["oauth_version"] = "1.0"
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def get(self, url, params):
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params.update(self.params)
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params["oauth_nonce"] = self.nonce(16)
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params["oauth_timestamp"] = int(time.time())
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params["oauth_signature"] = self.signature(url, params)
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return self.session.get(url, params=params)
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def signature(self, url, params):
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"""Generate 'oauth_signature' value"""
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query = urllib.parse.urlencode(sorted(params.items()))
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message = self.concat("GET", url, query).encode()
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key = self.concat(self.consumer_secret, self.token_secret).encode()
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signature = hmac.new(key, message, hashlib.sha1).digest()
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return base64.b64encode(signature).decode()
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@staticmethod
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def concat(*args):
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return "&".join(urllib.parse.quote(item, "") for item in args)
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@staticmethod
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def nonce(N, alphabet=string.ascii_letters):
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return "".join(random.choice(alphabet) for _ in range(N))
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