mirror of
https://github.com/aljazceru/bitfinex-api-py.git
synced 2025-12-18 22:34:21 +01:00
132 lines
3.7 KiB
Python
132 lines
3.7 KiB
Python
import hashlib
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import hmac
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import json
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from datetime import datetime
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from enum import IntEnum
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from typing import TYPE_CHECKING, Any, List, NoReturn, Optional
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import requests
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from bfxapi._utils.json_decoder import JSONDecoder
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from bfxapi._utils.json_encoder import JSONEncoder
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from bfxapi.exceptions import InvalidCredentialError
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from bfxapi.rest.exceptions import GenericError, RequestParameterError
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if TYPE_CHECKING:
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from requests.sessions import _Params
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class _Error(IntEnum):
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ERR_UNK = 10000
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ERR_GENERIC = 10001
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ERR_PARAMS = 10020
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ERR_AUTH_FAIL = 10100
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class Middleware:
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__TIMEOUT = 30
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def __init__(
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self, host: str, api_key: Optional[str] = None, api_secret: Optional[str] = None
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):
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self.__host = host
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self.__api_key = api_key
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self.__api_secret = api_secret
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def get(self, endpoint: str, params: Optional["_Params"] = None) -> Any:
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headers = {"Accept": "application/json"}
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if self.__api_key and self.__api_secret:
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headers = {**headers, **self.__get_authentication_headers(endpoint)}
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request = requests.get(
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url=f"{self.__host}/{endpoint}",
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params=params,
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headers=headers,
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timeout=Middleware.__TIMEOUT,
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)
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data = request.json(cls=JSONDecoder)
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if isinstance(data, list) and len(data) > 0 and data[0] == "error":
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self.__handle_error(data)
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return data
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def post(
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self,
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endpoint: str,
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body: Optional[Any] = None,
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params: Optional["_Params"] = None,
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) -> Any:
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_body = body and json.dumps(body, cls=JSONEncoder) or None
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headers = {"Accept": "application/json", "Content-Type": "application/json"}
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if self.__api_key and self.__api_secret:
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headers = {
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**headers,
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**self.__get_authentication_headers(endpoint, _body),
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}
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request = requests.post(
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url=f"{self.__host}/{endpoint}",
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data=_body,
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params=params,
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headers=headers,
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timeout=Middleware.__TIMEOUT,
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)
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data = request.json(cls=JSONDecoder)
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if isinstance(data, list) and len(data) > 0 and data[0] == "error":
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self.__handle_error(data)
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return data
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def __handle_error(self, error: List[Any]) -> NoReturn:
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if error[1] == _Error.ERR_PARAMS:
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raise RequestParameterError(
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"The request was rejected with the following parameter "
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f"error: <{error[2]}>."
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)
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if error[1] == _Error.ERR_AUTH_FAIL:
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raise InvalidCredentialError(
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"Can't authenticate with given API-KEY and API-SECRET."
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)
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if not error[1] or error[1] == _Error.ERR_UNK or error[1] == _Error.ERR_GENERIC:
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raise GenericError(
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"The request was rejected with the following generic "
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f"error: <{error[2]}>."
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)
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raise RuntimeError(
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f"The request was rejected with an unexpected error: <{error}>."
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)
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def __get_authentication_headers(self, endpoint: str, data: Optional[str] = None):
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assert self.__api_key and self.__api_secret
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nonce = str(round(datetime.now().timestamp() * 1_000_000))
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if not data:
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message = f"/api/v2/{endpoint}{nonce}"
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else:
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message = f"/api/v2/{endpoint}{nonce}{data}"
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signature = hmac.new(
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key=self.__api_secret.encode("utf8"),
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msg=message.encode("utf8"),
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digestmod=hashlib.sha384,
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)
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return {
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"bfx-nonce": nonce,
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"bfx-signature": signature.hexdigest(),
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"bfx-apikey": self.__api_key,
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}
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