mirror of
https://github.com/aljazceru/bitfinex-api-py.git
synced 2025-12-18 22:34:21 +01:00
110 lines
3.9 KiB
Python
110 lines
3.9 KiB
Python
from typing import TYPE_CHECKING, Optional, Any
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from enum import IntEnum
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from http import HTTPStatus
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import time, hmac, hashlib, json, requests
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from ..exceptions import NotFoundError, RequestParametersError, UnknownGenericError
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from ...exceptions import InvalidCredentialError
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from ..._utils.json_encoder import JSONEncoder
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from ..._utils.json_decoder import JSONDecoder
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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__(self, host: str, api_key: Optional[str] = None, api_secret: Optional[str] = None):
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self.host, self.api_key, self.api_secret = host, api_key, api_secret
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def __build_authentication_headers(self, endpoint: str, data: Optional[str] = None):
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assert isinstance(self.api_key, str) and isinstance(self.api_secret, str), \
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"API_KEY and API_SECRET must be both str to call __build_authentication_headers"
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nonce = str(round(time.time() * 1_000_000))
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if data is None:
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path = f"/api/v2/{endpoint}{nonce}"
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else: path = f"/api/v2/{endpoint}{nonce}{data}"
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signature = hmac.new(
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self.api_secret.encode("utf8"),
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path.encode("utf8"),
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hashlib.sha384
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).hexdigest()
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return {
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"bfx-nonce": nonce,
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"bfx-signature": signature,
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"bfx-apikey": self.api_key
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}
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def _get(self, endpoint: str, params: Optional["_Params"] = None) -> Any:
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response = requests.get(
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url=f"{self.host}/{endpoint}",
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params=params,
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timeout=Middleware.TIMEOUT
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)
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if response.status_code == HTTPStatus.NOT_FOUND:
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raise NotFoundError(f"No resources found at endpoint <{endpoint}>.")
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data = response.json(cls=JSONDecoder)
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if len(data) and data[0] == "error":
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if data[1] == _Error.ERR_PARAMS:
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raise RequestParametersError("The request was rejected with the " \
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f"following parameter error: <{data[2]}>")
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if data[1] is None or data[1] == _Error.ERR_UNK or data[1] == _Error.ERR_GENERIC:
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raise UnknownGenericError("The server replied to the request with " \
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f"a generic error with message: <{data[2]}>.")
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return data
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def _post(self, endpoint: str, params: Optional["_Params"] = None,
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body: Optional[Any] = None, _ignore_authentication_headers: bool = False) -> Any:
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data = body and json.dumps(body, cls=JSONEncoder) or None
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headers = { "Content-Type": "application/json" }
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if self.api_key and self.api_secret and not _ignore_authentication_headers:
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headers = { **headers, **self.__build_authentication_headers(endpoint, data) }
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response = requests.post(
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url=f"{self.host}/{endpoint}",
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params=params,
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data=data,
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headers=headers,
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timeout=Middleware.TIMEOUT
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)
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if response.status_code == HTTPStatus.NOT_FOUND:
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raise NotFoundError(f"No resources found at endpoint <{endpoint}>.")
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data = response.json(cls=JSONDecoder)
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if isinstance(data, list) and len(data) and data[0] == "error":
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if data[1] == _Error.ERR_PARAMS:
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raise RequestParametersError("The request was rejected with the " \
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f"following parameter error: <{data[2]}>")
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if data[1] == _Error.ERR_AUTH_FAIL:
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raise InvalidCredentialError("Cannot authenticate with given API-KEY and API-SECRET.")
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if data[1] is None or data[1] == _Error.ERR_UNK or data[1] == _Error.ERR_GENERIC:
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raise UnknownGenericError("The server replied to the request with " \
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f"a generic error with message: <{data[2]}>.")
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return data
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