Teams MCP

import { promises as fs } from "node:fs"; import { homedir } from "node:os"; import { join } from "node:path"; import { Client } from "@microsoft/microsoft-graph-client"; export interface AuthStatus { isAuthenticated: boolean; userPrincipalName?: string | undefined; displayName?: string | undefined; expiresAt?: string | undefined; } interface StoredAuthInfo { clientId: string; authenticated: boolean; timestamp: string; expiresAt?: string; token: string; } export class GraphService { private static instance: GraphService; private client: Client | undefined; private readonly authPath = join(homedir(), ".msgraph-mcp-auth.json"); private isInitialized = false; private authInfo: StoredAuthInfo | undefined; static getInstance(): GraphService { if (!GraphService.instance) { GraphService.instance = new GraphService(); } return GraphService.instance; } private async initializeClient(): Promise<void> { if (this.isInitialized) return; try { const authData = await fs.readFile(this.authPath, "utf8"); this.authInfo = JSON.parse(authData); if (this.authInfo?.authenticated && this.authInfo?.token) { // Check if token is expired if (this.authInfo.expiresAt) { const expiresAt = new Date(this.authInfo.expiresAt); if (expiresAt <= new Date()) { console.log( "Token has expired. Please re-authenticate with: npx @floriscornel/teams-mcp@latest authenticate" ); return; } } // Create Graph client with the saved token this.client = Client.initWithMiddleware({ authProvider: { getAccessToken: async () => { if (!this.authInfo?.token) { throw new Error("No token available"); } return this.authInfo.token; }, }, }); this.isInitialized = true; } } catch (error) { console.error("Failed to initialize Graph client:", error); } } async getAuthStatus(): Promise<AuthStatus> { await this.initializeClient(); if (!this.client) { return { isAuthenticated: false }; } try { const me = await this.client.api("/me").get(); return { isAuthenticated: true, userPrincipalName: me?.userPrincipalName ?? undefined, displayName: me?.displayName ?? undefined, expiresAt: this.authInfo?.expiresAt, }; } catch (error) { console.error("Error getting user info:", error); return { isAuthenticated: false }; } } async getClient(): Promise<Client> { await this.initializeClient(); if (!this.client) { throw new Error( "Not authenticated. Please run the authentication CLI tool first: npx @floriscornel/teams-mcp@latest authenticate" ); } return this.client; } isAuthenticated(): boolean { return !!this.client && this.isInitialized; } }