使用Python 3

Question

我正在尝试在python中为比特币交换API创建一个包装器。但是，API要求您为每个请求生成签名。我在使用python中的hmac模块正确生成SHA394签名时遇到了困难。以下是我的以下代码到目前为止的样子：

# private_client.py
# Mohammad Usman
#
# A python wrapper for Gemini's public API

from cached import Cached
import requests
import json
import uuid
import hmac
import hashlib
import base64
from datetime import datetime


class PrivateClient(metaclass=Cached):
    def __init__(self, PUBLIC_API_KEY, PRIVATE_API_KEY):
        self._public_key = PUBLIC_API_KEY
        self._private_key = PRIVATE_API_KEY
        self._base_url = 'https://api.gemini.com/'

    def api_query(self, method, payload=None):
        if payload is None:
            payload = {}
        request_url = self._base_url + method

        payload['request'] = method
        payload['nonce'] = str(uuid.uuid4())

        b64_payload = base64.b64encode(json.dumps(payload).encode('utf-8'))
        signature = hmac.new(self._private_key.encode('utf-8'), msg=b64_payload, digestmod=hashlib.sha256).digest()
        headers = {
            'Content-Type': "text/plain",
            'Content-Length': "0",
            'X-GEMINI-APIKEY': self._public_key,
            'X-GEMINI-PAYLOAD': b64_payload,
            'X-GEMINI-SIGNATURE': signature,
            'Cache-Control': "no-cache"
        }

        r = requests.request('POST', request_url, headers=headers)
        return r.json()

    def new_order(self, symbol, amount, price, side, options):
        payload = {
            'symbol': symbol,
            'amount': amount,
            'price': amount,
            'side': side,
            'options': options,
            'type': 'exchange limit'
        }
        return self.api_query('/v1/order/new', payload)


a = PrivateClient('public_key', 'private_key')
b = a.new_order('BTCUSD', '20.2', '4500.2', 'buy', ["immediate-or-cancel"])
print(b)

但是，我一直收到以下错误：

Traceback (most recent call last):
  File "C:\Users\uzman\Documents\Python\Gemini- Python API Wrapper\gemini\private_client.py", line 58, in <module>
    b = a.new_order('BTCUSD', '20.2', '4500.2', 'buy', ["immediate-or-cancel"])
  File "C:\Users\uzman\Documents\Python\Gemini- Python API Wrapper\gemini\private_client.py", line 54, in new_order
    return self.api_query('/v1/order/new', payload)
  File "C:\Users\uzman\Documents\Python\Gemini- Python API Wrapper\gemini\private_client.py", line 42, in api_query
    r = requests.request('POST', request_url, headers=headers)
  File "C:\Users\uzman\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Users\uzman\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\sessions.py", line 488, in request
    prep = self.prepare_request(req)
  File "C:\Users\uzman\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\sessions.py", line 431, in prepare_request
    hooks=merge_hooks(request.hooks, self.hooks),
  File "C:\Users\uzman\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\models.py", line 306, in prepare
    self.prepare_headers(headers)
  File "C:\Users\uzman\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\models.py", line 440, in prepare_headers
    check_header_validity(header)
  File "C:\Users\uzman\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\utils.py", line 869, in check_header_validity
    raise InvalidHeader("Invalid return character or leading space in header: %s" % name)
requests.exceptions.InvalidHeader: Invalid return character or leading space in header: X-GEMINI-SIGNATURE

任何帮助？