import binascii import hashlib import hmac import json import os from dataclasses import dataclass from datetime import datetime from typing import Optional from urllib.parse import quote, unquote import requests import yaml @dataclass class SberCloudConfig: access_key_id: Optional[str] = None secret_key: Optional[str] = None ecs_endpoint: Optional[str] = None project_id: Optional[str] = None @staticmethod def from_dict(config_dict: dict) -> 'SberCloudConfig': return SberCloudConfig(**config_dict) @staticmethod def from_yaml(config_path: str) -> 'SberCloudConfig': with open(config_path) as file: config_dict = yaml.load(file, Loader=yaml.FullLoader) return SberCloudConfig.from_dict(config_dict["sbercloud"]) @staticmethod def from_env() -> 'SberCloudConfig': config_dict = { "access_key_id": os.getenv("SBERCLOUD_ACCESS_KEY_ID"), "secret_key": os.getenv("SBERCLOUD_SECRET_KEY"), "ecs_endpoint": os.getenv("SBERCLOUD_ECS_ENDPOINT"), "project_id": os.getenv("SBERCLOUD_PROJECT_ID"), } return SberCloudConfig.from_dict(config_dict) class SberCloudAuthRequests: """ Implements authentication mechanism with access key+secret key in accordance with: https://support.hc.sbercloud.ru/devg/apisign/api-sign-algorithm.html endpoint - represents endpoint of a specific service (listed at https://support.hc.sbercloud.ru/en-us/endpoint/index.html) base_path - is prefix for all request path's that will be sent via this instance. """ ENCODING = "utf-8" ALGORITHM = "SDK-HMAC-SHA256" TIMESTAMP_FORMAT = "%Y%m%dT%H%M%SZ" def __init__(self, endpoint: str, access_key_id: str, secret_key: str, base_path: str = "") -> None: self.endpoint = endpoint self.base_path = base_path self.access_key_id = access_key_id self.secret_key = secret_key def get(self, path: str, query: Optional[dict] = None) -> requests.Response: return self._send_request("GET", path, query, data=None) def post(self, path: str, query: Optional[dict] = None, data: Optional[dict] = None) -> requests.Response: return self._send_request("POST", path, query, data) def _send_request(self, method: str, path: str, query: Optional[dict], data: Optional[dict]) -> requests.Response: if self.base_path: path = self.base_path + path timestamp = datetime.strftime(datetime.utcnow(), self.TIMESTAMP_FORMAT) headers = self._build_original_headers(timestamp) content = "" if data: # At the moment we support json content only content = json.dumps(data) headers["Content-Type"] = "application/json" body = content.encode(self.ENCODING) signed_headers = self._build_signed_headers(headers) canonical_request = self._build_canonical_request(method, path, query, body, headers, signed_headers) signature = self._build_signature(timestamp, canonical_request) headers["Authorization"] = self._build_authorization_header(signature, signed_headers) query_string = "?" + self._build_canonical_query_string(query) if query else "" url = f"https://{self.endpoint}{path}{query_string}" response = requests.request(method, url, headers=headers, data=body) if response.status_code < 200 or response.status_code >= 300: raise AssertionError(f"Request to url={url} failed: status={response.status_code} " f"response={response.text})") return response def _build_original_headers(self, timestamp: str) -> dict[str, str]: return { "X-Sdk-Date": timestamp, "host": self.endpoint, } def _build_signed_headers(self, headers: dict[str, str]) -> list[str]: return sorted(header_name.lower() for header_name in headers) def _build_canonical_request(self, method: str, path: str, query: Optional[dict], body: bytes, headers: dict[str, str], signed_headers: list[str]) -> str: canonical_headers = self._build_canonical_headers(headers, signed_headers) body_hash = self._calc_sha256_hash(body) canonical_url = self._build_canonical_url(path) canonical_query_string = self._build_canonical_query_string(query) return "\n".join([ method.upper(), canonical_url, canonical_query_string, canonical_headers, ";".join(signed_headers), body_hash ]) def _build_canonical_headers(self, headers: dict[str, str], signed_headers: list[str]) -> str: normalized_headers = {} for key, value in headers.items(): normalized_key = key.lower() normalized_value = value.strip() normalized_headers[normalized_key] = normalized_value # Re-encode header in request itself (iso-8859-1 comes from HTTP 1.1 standard) headers[key] = normalized_value.encode(self.ENCODING).decode("iso-8859-1") # Join headers in the same order as they are sorted in signed_headers list joined_headers = "\n".join(f"{key}:{normalized_headers[key]}" for key in signed_headers) return joined_headers + "\n" def _calc_sha256_hash(self, value: bytes) -> str: sha256 = hashlib.sha256() sha256.update(value) return sha256.hexdigest() def _build_canonical_url(self, path: str) -> str: path_parts = unquote(path).split("/") canonical_url = "/".join(quote(path_part) for path_part in path_parts) if not canonical_url.endswith("/"): canonical_url += "/" return canonical_url def _build_canonical_query_string(self, query: Optional[dict]) -> str: if not query: return "" key_value_pairs = [] for key in sorted(query.keys()): # NOTE: we do not support list values, as they are not used in API at the moment encoded_key = quote(key) encoded_value = quote(str(query[key])) key_value_pairs.append(f"{encoded_key}={encoded_value}") return "&".join(key_value_pairs) def _build_signature(self, timestamp: str, canonical_request: str) -> str: canonical_request_hash = self._calc_sha256_hash(canonical_request.encode(self.ENCODING)) string_to_sign = f"{self.ALGORITHM}\n{timestamp}\n{canonical_request_hash}" hmac_digest = hmac.new( key=self.secret_key.encode(self.ENCODING), msg=string_to_sign.encode(self.ENCODING), digestmod=hashlib.sha256 ).digest() signature = binascii.hexlify(hmac_digest).decode() return signature def _build_authorization_header(self, signature: str, signed_headers: list[str]) -> str: joined_signed_headers = ";".join(signed_headers) return f"{self.ALGORITHM} Access={self.access_key_id}, SignedHeaders={joined_signed_headers}, Signature={signature}" class SberCloud: """ Manages resources in Sbercloud via API. API reference: https://docs.sbercloud.ru/terraform/ug/topics/quickstart.html https://support.hc.sbercloud.ru/en-us/api/ecs/en-us_topic_0020212668.html """ def __init__(self, config: SberCloudConfig) -> None: self.ecs_requests = SberCloudAuthRequests( endpoint=config.ecs_endpoint, base_path=f"/v1/{config.project_id}/cloudservers", access_key_id=config.access_key_id, secret_key=config.secret_key, ) self.ecs_nodes = [] # Cached list of ecs servers def find_ecs_node_by_ip(self, ip: str, no_cache: bool = False) -> str: if not self.ecs_nodes or no_cache: self.ecs_nodes = self.get_ecs_nodes() nodes_by_ip = [ node for node in self.ecs_nodes if ip in [ node_ip['addr'] for node_ips in node['addresses'].values() for node_ip in node_ips ] ] assert len(nodes_by_ip) == 1 return nodes_by_ip[0]['id'] def get_ecs_nodes(self) -> list[dict]: response = self.ecs_requests.get("/detail").json() return response["servers"] def start_node(self, node_id: Optional[str] = None, node_ip: Optional[str] = None) -> None: data = { 'os-start': { 'servers': [ { 'id': node_id or self.find_ecs_node_by_ip(node_ip) } ] } } self.ecs_requests.post("/action", data=data) def stop_node(self, node_id: Optional[str] = None, node_ip: Optional[str] = None, hard: bool = False) -> None: data = { 'os-stop': { 'type': 'HARD' if hard else 'SOFT', 'servers': [ { 'id': node_id or self.find_ecs_node_by_ip(node_ip) } ] } } self.ecs_requests.post("/action", data=data)