Created
March 19, 2020 17:47
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const fs = require('fs'); | |
const readline = require('readline'); | |
const {google} = require('googleapis'); | |
// If modifying these scopes, delete token.json. | |
const SCOPES = ['https://www.googleapis.com/auth/gmail.readonly','https://www.googleapis.com/auth/gmail.modify', | |
'https://www.googleapis.com/auth/gmail.compose','https://www.googleapis.com/auth/gmail.send']; | |
// The file token.json stores the user's access and refresh tokens, and is | |
// created automatically when the authorization flow completes for the first | |
// time. | |
const TOKEN_PATH = 'token.json'; | |
// Load client secrets from a local file. | |
fs.readFile('credentials.json', (err, content) => { | |
if(err){ | |
return console.log('Error loading client secret file:', err); | |
} | |
// Authorize the client with credentials, then call the Gmail API. | |
authorize(JSON.parse(content), getAuth); | |
}); | |
/** | |
* Create an OAuth2 client with the given credentials, and then execute the | |
* given callback function. | |
* @param {Object} credentials The authorization client credentials. | |
* @param {function} callback The callback to call with the authorized client. | |
*/ | |
function authorize(credentials, callback) { | |
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. | |
fs.readFile(TOKEN_PATH, (err, token) => { | |
if(err){ | |
return getNewToken(oAuth2Client, callback); | |
} | |
oAuth2Client.setCredentials(JSON.parse(token)); | |
callback(oAuth2Client); | |
}); | |
} | |
/** | |
* Get and store new token after prompting for user authorization, and then | |
* execute the given callback with the authorized OAuth2 client. | |
* @param {google.auth.OAuth2} oAuth2Client The OAuth2 client to get token for. | |
* @param {getEventsCallback} callback The callback for the authorized client. | |
*/ | |
function getNewToken(oAuth2Client, callback) { | |
const authUrl = oAuth2Client.generateAuthUrl({ | |
access_type: 'offline', | |
scope: 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) return console.error('Error retrieving access token', err); | |
oAuth2Client.setCredentials(token); | |
// Store the token to disk for later program executions | |
fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => { | |
if (err) return console.error(err); | |
console.log('Token stored to', TOKEN_PATH); | |
}); | |
callback(oAuth2Client); | |
}); | |
}); | |
} | |
function getAuth(auth){ | |
} |
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