import base58 import hmac import hashlib import yaml import os import json import logging from txjsonrpc import jsonrpclib log = logging.getLogger(__name__) API_KEY_NAME = "api" def sha(x): h = hashlib.sha256(x).digest() return base58.b58encode(h) def generate_key(x=None): if x is None: return sha(os.urandom(256)) else: return sha(x) def jsonrpc_dumps_pretty(obj, **kwargs): return jsonrpclib.dumps(obj, sort_keys=True, indent=2, separators=(',', ': '), **kwargs) class APIKey(object): def __init__(self, secret, name, expiration=None): self.secret = secret self.name = name self.expiration = expiration @classmethod def new(cls, seed=None, name=None, expiration=None): secret = generate_key(seed) key_name = name if name else sha(secret) return APIKey(secret, key_name, expiration) def _raw_key(self): return base58.b58decode(self.secret) def get_hmac(self, message): decoded_key = self._raw_key() signature = hmac.new(decoded_key, message, hashlib.sha256) return base58.b58encode(signature.digest()) def compare_hmac(self, message, token): decoded_token = base58.b58decode(token) target = base58.b58decode(self.get_hmac(message)) try: assert len(decoded_token) == len(target), "Length mismatch" r = hmac.compare_digest(decoded_token, target) except: return False return r def load_api_keys(path): if not os.path.isfile(path): raise Exception("Invalid api key path") with open(path, "r") as f: data = yaml.load(f.read()) keys_for_return = {} for key_name in data: key = data[key_name] secret = key['secret'] expiration = key['expiration'] keys_for_return.update({key_name: APIKey(secret, key_name, expiration)}) return keys_for_return def save_api_keys(keys, path): with open(path, "w") as f: key_dict = {keys[key_name].name: {'secret': keys[key_name].secret, 'expiration': keys[key_name].expiration} for key_name in keys} data = yaml.safe_dump(key_dict) f.write(data) def initialize_api_key_file(key_path): if not os.path.isfile(key_path): keys = {} new_api_key = APIKey.new(name=API_KEY_NAME) keys.update({new_api_key.name: new_api_key}) save_api_keys(keys, key_path) def get_auth_message(message_dict): return json.dumps(message_dict, sort_keys=True)