Coinbase REST API auth (Python)

coinbase_auth.py

import time
import hmac
import hashlib
import requests
import base64


class CoinbaseAuth(requests.auth.AuthBase):
	def __init__(self, api_key, secret_key, api_passphrase):
		self.api_key = api_key
		self.api_passphrase = api_passphrase
		self.secret_key = base64.b64decode(secret_key)
	
	def __call__(self, request):
		timestamp = str(time.time())
		message = timestamp + request.method + request.path_url + (request.body or '')
		signature = base64.b64encode(hmac.new(self.secret_key, message.encode(), hashlib.sha256).digest())
		request.headers.update({
			'CB-ACCESS-SIGN': signature,
			'CB-ACCESS-TIMESTAMP': timestamp,
			'CB-ACCESS-KEY': self.api_key,
			'CB-ACCESS-PASSPHRASE': self.api_passphrase
		})
		return request


COINBASE_API = 'https://api.exchange.coinbase.com'

API_KEY = 'xxx'
API_SECRET = 'xxx'
API_PASSPHRASE = 'xxx'

auth = CoinbaseAuth(API_KEY, API_SECRET, API_PASSPHRASE)

r = requests.get(COINBASE_API + '/oracle', auth=auth)
print(r.json())