MCP Outlook Server

from __future__ import annotations from dataclasses import dataclass from functools import lru_cache import os from typing import Optional class ConfigurationError(RuntimeError): """Raised when required Microsoft Graph configuration is missing.""" @dataclass(frozen=True) class GraphSettings: tenant_id: Optional[str] client_id: Optional[str] client_secret: Optional[str] default_sender: Optional[str] = None delegated_token: Optional[str] = None @classmethod def load(cls) -> "GraphSettings": tenant_id = os.environ.get("GRAPH_TENANT_ID", "").strip() or None client_id = os.environ.get("GRAPH_CLIENT_ID", "").strip() or None client_secret = os.environ.get("GRAPH_CLIENT_SECRET", "").strip() or None default_sender = os.environ.get("GRAPH_DEFAULT_SENDER", "").strip() or None delegated_token = os.environ.get("GRAPH_USER_ACCESS_TOKEN", "").strip() or None # For multi-tenant support, environment variables are optional. # Users can provide credentials as tool parameters instead. return cls( tenant_id=tenant_id, client_id=client_id, client_secret=client_secret, default_sender=default_sender, delegated_token=delegated_token, ) @lru_cache(maxsize=1) def get_graph_settings() -> GraphSettings: """ Retrieve cached Microsoft Graph settings. Raises: ConfigurationError: if required environment variables are missing. """ return GraphSettings.load()