const {google} = require('googleapis'); import createNewEventEmail from "./emails/new-event"; const googleAuth = () => { const {client_secret, client_id, redirect_uris} = JSON.parse(process.env.GOOGLE_API_CREDENTIALS).web; return new google.auth.OAuth2(client_id, client_secret, redirect_uris[0]); }; function handleErrorsJson(response) { if (!response.ok) { response.json().then(console.log); throw Error(response.statusText); } return response.json(); } function handleErrorsRaw(response) { if (!response.ok) { response.text().then(console.log); throw Error(response.statusText); } return response.text(); } const o365Auth = (credential) => { const isExpired = (expiryDate) => expiryDate < +(new Date()); const refreshAccessToken = (refreshToken) => fetch('https://login.microsoftonline.com/common/oauth2/v2.0/token', { method: 'POST', headers: {'Content-Type': 'application/x-www-form-urlencoded'}, body: new URLSearchParams({ 'scope': 'User.Read Calendars.Read Calendars.ReadWrite', 'client_id': process.env.MS_GRAPH_CLIENT_ID, 'refresh_token': refreshToken, 'grant_type': 'refresh_token', 'client_secret': process.env.MS_GRAPH_CLIENT_SECRET, }) }) .then(handleErrorsJson) .then((responseBody) => { credential.key.access_token = responseBody.access_token; credential.key.expiry_date = Math.round((+(new Date()) / 1000) + responseBody.expires_in); return credential.key.access_token; }) return { getToken: () => !isExpired(credential.key.expiry_date) ? Promise.resolve(credential.key.access_token) : refreshAccessToken(credential.key.refresh_token) }; }; interface Person { name?: string, email: string, timeZone: string } interface CalendarEvent { type: string; title: string; startTime: string; endTime: string; description?: string; location?: string; organizer: Person; attendees: Person[]; }; interface CalendarApiAdapter { createEvent(event: CalendarEvent): Promise; updateEvent(uid: String, event: CalendarEvent); deleteEvent(uid: String); getAvailability(dateFrom, dateTo): Promise; } const MicrosoftOffice365Calendar = (credential): CalendarApiAdapter => { const auth = o365Auth(credential); const translateEvent = (event: CalendarEvent) => { let optional = {}; if (event.location) { optional.location = {displayName: event.location}; } return { subject: event.title, body: { contentType: 'HTML', content: event.description, }, start: { dateTime: event.startTime, timeZone: event.organizer.timeZone, }, end: { dateTime: event.endTime, timeZone: event.organizer.timeZone, }, attendees: event.attendees.map(attendee => ({ emailAddress: { address: attendee.email, name: attendee.name }, type: "required" })), ...optional } }; return { getAvailability: (dateFrom, dateTo) => { const payload = { schedules: [credential.key.email], startTime: { dateTime: dateFrom, timeZone: 'UTC', }, endTime: { dateTime: dateTo, timeZone: 'UTC', }, availabilityViewInterval: 60 }; return auth.getToken().then( (accessToken) => fetch('https://graph.microsoft.com/v1.0/me/calendar/getSchedule', { method: 'post', headers: { 'Authorization': 'Bearer ' + accessToken, 'Content-Type': 'application/json' }, body: JSON.stringify(payload) }) .then(handleErrorsJson) .then(responseBody => { return responseBody.value[0].scheduleItems.map((evt) => ({ start: evt.start.dateTime + 'Z', end: evt.end.dateTime + 'Z' })) }) ).catch((err) => { console.log(err); }); }, createEvent: (event: CalendarEvent) => auth.getToken().then(accessToken => fetch('https://graph.microsoft.com/v1.0/me/calendar/events', { method: 'POST', headers: { 'Authorization': 'Bearer ' + accessToken, 'Content-Type': 'application/json', }, body: JSON.stringify(translateEvent(event)) }).then(handleErrorsJson).then((responseBody) => ({ ...responseBody, disableConfirmationEmail: true, }))), deleteEvent: (uid: String) => auth.getToken().then(accessToken => fetch('https://graph.microsoft.com/v1.0/me/calendar/events/' + uid, { method: 'DELETE', headers: { 'Authorization': 'Bearer ' + accessToken } }).then(handleErrorsRaw)), updateEvent: (uid: String, event: CalendarEvent) => auth.getToken().then(accessToken => fetch('https://graph.microsoft.com/v1.0/me/calendar/events/' + uid, { method: 'PATCH', headers: { 'Authorization': 'Bearer ' + accessToken, 'Content-Type': 'application/json' }, body: JSON.stringify(translateEvent(event)) }).then(handleErrorsRaw)), } }; const GoogleCalendar = (credential): CalendarApiAdapter => { const myGoogleAuth = googleAuth(); myGoogleAuth.setCredentials(credential.key); return { getAvailability: (dateFrom, dateTo) => new Promise((resolve, reject) => { const calendar = google.calendar({version: 'v3', auth: myGoogleAuth}); calendar.calendarList .list() .then(cals => { calendar.freebusy.query({ requestBody: { timeMin: dateFrom, timeMax: dateTo, items: cals.data.items } }, (err, apires) => { if (err) { reject(err); } resolve( Object.values(apires.data.calendars).flatMap( (item) => item["busy"] ) ) }); }) .catch((err) => { reject(err); }); }), createEvent: (event: CalendarEvent) => new Promise((resolve, reject) => { const payload = { summary: event.title, description: event.description, start: { dateTime: event.startTime, timeZone: event.organizer.timeZone, }, end: { dateTime: event.endTime, timeZone: event.organizer.timeZone, }, attendees: event.attendees, reminders: { useDefault: false, overrides: [ {'method': 'email', 'minutes': 60} ], }, }; if (event.location) { payload['location'] = event.location; } const calendar = google.calendar({version: 'v3', auth: myGoogleAuth}); calendar.events.insert({ auth: myGoogleAuth, calendarId: 'primary', resource: payload, }, function (err, event) { if (err) { console.log('There was an error contacting the Calendar service: ' + err); return reject(err); } return resolve(event.data); }); }), updateEvent: (uid: String, event: CalendarEvent) => new Promise((resolve, reject) => { const payload = { summary: event.title, description: event.description, start: { dateTime: event.startTime, timeZone: event.organizer.timeZone, }, end: { dateTime: event.endTime, timeZone: event.organizer.timeZone, }, attendees: event.attendees, reminders: { useDefault: false, overrides: [ {'method': 'email', 'minutes': 60} ], }, }; if (event.location) { payload['location'] = event.location; } const calendar = google.calendar({version: 'v3', auth: myGoogleAuth}); calendar.events.update({ auth: myGoogleAuth, calendarId: 'primary', eventId: uid, sendNotifications: true, sendUpdates: 'all', resource: payload }, function (err, event) { if (err) { console.log('There was an error contacting the Calendar service: ' + err); return reject(err); } return resolve(event.data); }); }), deleteEvent: (uid: String) => new Promise( (resolve, reject) => { const calendar = google.calendar({version: 'v3', auth: myGoogleAuth}); calendar.events.delete({ auth: myGoogleAuth, calendarId: 'primary', eventId: uid, sendNotifications: true, sendUpdates: 'all', }, function (err, event) { if (err) { console.log('There was an error contacting the Calendar service: ' + err); return reject(err); } return resolve(event.data); }); }) }; }; // factory const calendars = (withCredentials): CalendarApiAdapter[] => withCredentials.map((cred) => { switch (cred.type) { case 'google_calendar': return GoogleCalendar(cred); case 'office365_calendar': return MicrosoftOffice365Calendar(cred); default: return; // unknown credential, could be legacy? In any case, ignore } }).filter(Boolean); const getBusyTimes = (withCredentials, dateFrom, dateTo) => Promise.all( calendars(withCredentials).map(c => c.getAvailability(dateFrom, dateTo)) ).then( (results) => results.reduce((acc, availability) => acc.concat(availability), []) ); const createEvent = (credential, calEvent: CalendarEvent): Promise => { createNewEventEmail( calEvent, ); if (credential) { return calendars([credential])[0].createEvent(calEvent); } return Promise.resolve({}); }; const updateEvent = (credential, uid: String, calEvent: CalendarEvent): Promise => { if (credential) { return calendars([credential])[0].updateEvent(uid, calEvent); } return Promise.resolve({}); }; const deleteEvent = (credential, uid: String): Promise => { if (credential) { return calendars([credential])[0].deleteEvent(uid); } return Promise.resolve({}); }; export {getBusyTimes, createEvent, updateEvent, deleteEvent, CalendarEvent};