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google-calendar.js
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google-calendar.js
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const fs = require('fs').promises
const readline = require('readline')
const {google} = require('googleapis')
class GoogleCalendarApi {
constructor(isReadOnly, tokenPath, credentialsPath) {
this.scopes = ['https://www.googleapis.com/auth/calendar']
this.token_path = tokenPath
this.credentialsPath = credentialsPath
}
async getClient() {
if( this.auth == null){
this.auth = await this.authorize(JSON.parse(await fs.readFile(this.credentialsPath)))
}
return this.auth
}
async insertEvent(event) {
let auth = await this.getClient()
return await new Promise((resolve, reject)=>{
const calendar = google.calendar({ version: 'v3', auth })
calendar.events.insert({
auth: auth,
calendarId: 'primary',
resource: event
}, (err, event) => {
if (err) {
console.log('There was an error contacting the Calendar service: ' + err)
reject(err)
return
}
console.log('Event created: %s', event.data.htmlLink)
resolve()
}
)
})
}
async deleteEvent(eventId) {
let auth = await this.getClient()
return await new Promise((resolve, reject) => {
const calendar = google.calendar({version: 'v3', auth})
calendar.events.delete({
calendarId: 'primary',
eventId: eventId
}, (err, _res) => {
if (err) {
console.log('The API returned an error: ' + err)
reject(err)
return
}
console.log('Delete event id: ' + err)
resolve()
})
})
}
async fetchEvents(fromDate, toDate) {
let auth = await this.getClient()
return await new Promise((resolve, reject) => {
const calendar = google.calendar({version: 'v3', auth})
calendar.events.list({
calendarId: 'primary',
timeMin: fromDate.toISOString(),
maxResults: 250,
singleEvents: true,
orderBy: 'startTime',
}, (err, res) => {
if (err) {
console.log('The API returned an error: ' + err)
reject(err)
return
}
resolve(res.data.items)
})
})
}
async authorize(credentials) {
const {client_secret, client_id, redirect_uris} = credentials.installed
const oAuth2Client = new google.auth.OAuth2(
client_id, client_secret, redirect_uris[0])
// Check if we have previously stored a token.
try {
let token = await fs.readFile(this.token_path)
oAuth2Client.setCredentials(JSON.parse(token))
} catch (err) {
let res = await this.getAccessToken(oAuth2Client)
return res
}
return oAuth2Client
}
getAccessToken(oAuth2Client, callback) {
return new Promise((resolve, reject)=>{
const authUrl = oAuth2Client.generateAuthUrl({
access_type: 'offline',
scope: this.scopes,
})
console.log('Authorize this app by visiting this url:', authUrl)
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
})
rl.question('Enter the code from that page here: ', (code) => {
rl.close()
oAuth2Client.getToken(code, (err, token) => {
if (err){
console.error('Error retrieving access token', err)
reject()
return
}
oAuth2Client.setCredentials(token)
// Store the token to disk for later program executions
fs.writeFile(this.token_path, JSON.stringify(token)).then((_)=>{
console.log('Token stored to', this.token_path)
resolve(oAuth2Client)
}).catch((err)=>{
console.error(err)
resolve(oAuth2Client)
})
})
})
})
}
}
module.exports.default = GoogleCalendarApi
module.exports = GoogleCalendarApi