Timesheet Assistant MCP

import { Client } from '@microsoft/microsoft-graph-client'; import { ConfidentialClientApplication } from '@azure/msal-node'; import { CalendarEvent } from '../types/index.js'; export class OutlookCalendarIntegration { private msalClient: ConfidentialClientApplication | null = null; private graphClient: Client | null = null; private accessToken: string | null = null; async initialize( clientId: string, clientSecret: string, tenantId: string, tokens?: { access_token: string; refresh_token: string } ): Promise<void> { this.msalClient = new ConfidentialClientApplication({ auth: { clientId, clientSecret, authority: `https://login.microsoftonline.com/${tenantId}`, }, }); if (tokens) { this.accessToken = tokens.access_token; this.graphClient = Client.init({ authProvider: (done) => { done(null, this.accessToken!); }, }); } } getAuthUrl(redirectUri: string): string { if (!this.msalClient) { throw new Error('MSAL client not initialized'); } const clientId = (this.msalClient as any).config.auth.clientId; return `https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id=${clientId}&response_type=code&redirect_uri=${encodeURIComponent( redirectUri )}&scope=${encodeURIComponent('https://graph.microsoft.com/Calendars.Read offline_access')}`; } async setAuthorizationCode( code: string, redirectUri: string ): Promise<{ access_token: string; refresh_token: string; expiry_date: number }> { if (!this.msalClient) { throw new Error('MSAL client not initialized'); } const tokenResponse = await this.msalClient.acquireTokenByCode({ code, scopes: ['https://graph.microsoft.com/Calendars.Read'], redirectUri, }); if (!tokenResponse || !tokenResponse.accessToken) { throw new Error('Failed to acquire token'); } this.accessToken = tokenResponse.accessToken; this.graphClient = Client.init({ authProvider: (done) => { done(null, this.accessToken!); }, }); return { access_token: tokenResponse.accessToken, refresh_token: (tokenResponse as any).refreshToken || '', expiry_date: tokenResponse.expiresOn ? tokenResponse.expiresOn.getTime() : Date.now() + 3600000, }; } async refreshAccessToken(refreshToken: string): Promise<{ access_token: string; refresh_token: string; expiry_date: number; }> { if (!this.msalClient) { throw new Error('MSAL client not initialized'); } const tokenResponse = await this.msalClient.acquireTokenByRefreshToken({ refreshToken, scopes: ['https://graph.microsoft.com/Calendars.Read'], }); if (!tokenResponse || !tokenResponse.accessToken) { throw new Error('Failed to refresh token'); } this.accessToken = tokenResponse.accessToken; this.graphClient = Client.init({ authProvider: (done) => { done(null, this.accessToken!); }, }); return { access_token: tokenResponse.accessToken, refresh_token: (tokenResponse as any).refreshToken || refreshToken, expiry_date: tokenResponse.expiresOn ? tokenResponse.expiresOn.getTime() : Date.now() + 3600000, }; } async getEventsForDate(dateStr: string): Promise<CalendarEvent[]> { if (!this.graphClient) { throw new Error('Outlook Calendar not initialized'); } // Validate YYYY-MM-DD format if (!/^\d{4}-\d{2}-\d{2}$/.test(dateStr)) { throw new Error('Date must be in YYYY-MM-DD format (e.g., "2025-12-01")'); } // Parse date for local day start/end times const [year, month, day] = dateStr.split('-').map(Number); const dayStart = new Date(year, month - 1, day, 0, 0, 0); const dayEnd = new Date(year, month - 1, day, 23, 59, 59); try { const response = await this.graphClient .api('/me/calendar/calendarView') .query({ startDateTime: dayStart.toISOString(), endDateTime: dayEnd.toISOString(), }) .select('subject,start,end,attendees') .orderby('start/dateTime') .get(); const events = response.value || []; return events .filter((event: any) => { // Filter out all-day events return event.start?.dateTime && event.end?.dateTime; }) .map((event: any) => ({ title: event.subject || 'Untitled Event', start: new Date(event.start.dateTime + 'Z'), // Add Z for UTC end: new Date(event.end.dateTime + 'Z'), attendees: event.attendees?.length || 0, })); } catch (error: any) { if (error.statusCode === 401) { throw new Error('Authentication expired. Please re-authenticate.'); } throw error; } } isAuthenticated(): boolean { return this.graphClient !== null && this.accessToken !== null; } }