"""
Contains all API Client sub-classes, which store exchange specific details
and feature the respective exchanges authentication method (sign()).
"""
# Import Built-ins
import logging
import json
import hashlib
import hmac
import base64
# Import Homebrew
from bitex.api.REST.api import APIClient
log = logging.getLogger(__name__)
class GeminiREST(APIClient):
def __init__(self, key=None, secret=None, api_version='v1',
url='https://api.gemini.com', timeout=5):
super(GeminiREST, self).__init__(url, api_version=api_version, key=key,
secret=secret, timeout=timeout)
def sign(self, uri, endpoint, endpoint_path, method_verb, *args, **kwargs):
nonce = self.nonce()
try:
params = kwargs['params']
except KeyError:
params = {}
payload = params
payload['nonce'] = nonce
payload['request'] = endpoint_path
js = json.dumps(payload)
data = base64.standard_b64encode(js.encode('utf8'))
h = hmac.new(self.secret.encode('utf8'), data, hashlib.sha384)
signature = h.hexdigest()
headers = {'X-GEMINI-APIKEY': self.key,
'X-GEMINI-PAYLOAD': data,
'X-GEMINI-SIGNATURE': signature}
return uri, {'headers': headers}
