mma-gpacts-app/auth.js
2020-04-04 15:50:15 -07:00

95 lines
3.3 KiB
JavaScript

// Authentication tasks
// --------------------
const fs = require('fs');
const {google} = require('googleapis');
// If modifying these scopes, delete token.json.
const SCOPES = ['https://www.googleapis.com/auth/photoslibrary.readonly.appcreateddata'];
// 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';
function run(req, res, callback) {
// 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 a client with credentials, then call the Google Drive API.
authorize(JSON.parse(content), req, res, callback);
});
}
// Authentication related
function auth_redirect(req, res) {
// 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 a client with credentials
const credentials = JSON.parse(content);
const {client_secret, client_id, redirect_uris} = credentials.web;
const oAuth2Client = new google.auth.OAuth2(client_id, client_secret, redirect_uris[0]);
// oAuth2Client.getToken(ur.searchParams.get("code"), (err, token) => {
oAuth2Client.getToken(req.param("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);
});
res.redirect(301, '/tiny');
});
});
}
/**
* 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, req, res, callback) {
const {client_secret, client_id, redirect_uris} = credentials.web;
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 getAccessToken(oAuth2Client, req, res, callback);
oAuth2Client.setCredentials(JSON.parse(token));
callback(req, res);
});
}
/**
* 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 getAccessToken(oAuth2Client, req, res, callback) {
const authUrl = oAuth2Client.generateAuthUrl({
access_type: 'online',
scope: SCOPES,
});
res.redirect(301, authUrl);
}
// Exported functions
module.exports = {
run: run,
redirect: auth_redirect
}
// vim: ai ts=4 sts=4 et sw=4 ft=javascript