Express Authenticators

Modern OAuth/OAuth2 authenticator.

Features

• Pre-configured for popular providers: Apple, Google, Facebook, Foursquare, Github, Twitter, LinkedIn, LINE, Pinterest, Tumblr, Instagram.
• Pre-configured for popular scopes: email, profile, etc. with account fetching for basic user information.
• OAuth/OAuth2 utilities are available for customizing new providers.
• The only dependencies are r3986 and jws (jws is required for Google and Apple token check).
• Strongly typed with TypeScript.
• Support PKCE(Proof Key for Code Exchange).
• Generic and pure interface. Do not depend on any framework.

Usage

• With yarn: yarn add express-authenticators.
• With npm: npm install --save express-authenticators.

Requirement

• fetch polyfilled.
• NodeJS >= v14.17.0 (to use randomUUID()).

Exported APIs

export {
	getGoogleConsentUrl, getGoogleAccessToken, fetchGoogleProfile, refreshGoogleAccessToken, verifyGoogleIdToken,
	getFacebookConsentUrl, getFacebookAccessToken, fetchFacebookProfile,
	getAppleConsentUrl, getAppleToken, generateAppleClientSecret, verifyAppleIdToken, revokeAppleToken,
	getGithubConsentUrl, getGithubAccessToken, fetchGithubProfile,
	getFoursquareConsentUrl, getFoursquareAccessToken, fetchFoursquareProfile,
	getInstagramConsentUrl, getInstagramAccessToken, fetchInstagramProfile,
	getLineConsentUrl, getLineAccessToken, fetchLineProfile, refreshLineAccessToken,
	getLinkedInConsentUrl, getLinkedInAccessToken, fetchLinkedInProfile,
	getTwitterConsentUrl, getTwitterAccessToken, fetchTwitterProfile,
	getTumblrConsentUrl, getTumblrAccessToken, fetchTumblrProfile,
	getZaloConsentUrl, getZaloAccessToken, fetchZaloProfile, refreshZaloAccessToken,
	getPinterestConsentUrl, getPinterestAccessToken, fetchPinterestProfile,
	getConsentUrl, getAccessToken,
	getOauth1ConsentUrl, getOAuth1AccessToken, oauth1SignAndFetch,
}

Sample Usage

import {
	getGoogleConsentUrl, getGoogleAccessToken, fetchGoogleProfile, refreshGoogleAccessToken, verifyGoogleIdToken,
} from 'express-authenticators'
import express from 'express'
import session from 'express-session'

const app = express()
app.use(session())

app.get(
	'/auth/google',
	async (req, res, next) => {
		req.session.someInfo = 'my info' // store the user credential
		try {
			const {url, state} = await getGoogleConsentUrl({
        clientID: 'your client id',
        redirectUri: 'https://your-host.com/auth/google/callback',
      })
			req.session.oauthGoogle = JSON.stringify(state)
			res.redirect(302, url)
		} catch (e) {
			next(e)
		}
	}
)
app.get( // for AppleAuthenticator, must use POST method instead
	'/auth/google/callback',
	async (req, res, next) => {
		try {
			const {access_token} = await getGoogleAccessToken(
        {
          clientID: 'your client id',
          clientSecret: 'your client secret',
          redirectUri: 'https://your-host.com/auth/google/callback',
        },
				JSON.parse(req.session.oauthGoogle),
        Object.fromEntries(new URLSearchParams(new URL(`https://example.com${req.url}`).search)) // for AppleAuthenticator, use req.body instead
			)
			const profile = await fetchGoogleProfile(access_token)
			console.log('got profile', profile)
			res.send(JSON.stringify(profile))
		} catch (e) {
			next(e)
		}
	}
)

Profile interface

All fetch profile APIs return the same interface:

interface OAuthProfile {
	id?: string
	email?: string
	emailVerified?: boolean
	first?: string
	last?: string
	avatar?: string
	raw: any
}

Where raw is the raw JSON-parsed data returned from the provider. Other fields are calculated carefully based on the data returned from each provider.