kundkingan / firebase-auth-node

index.js

'use strict';

let firebase = require('firebase');
let admin = require('firebase-admin');

/** Class representing a firebase authentication */
class FirebaseAuth {
	/**
	 * Creates a firebaseAuth
	 * @params {Object} firebaseConfig - The config for firebase
	 * @params {Object} serviceKey - The service account for firebase
	 */
	constructor(firebaseConfig, serviceKey) {
		this.firebase = firebase;
		this.admin = admin;
		this.firebase.initializeApp(firebaseConfig);
		this.admin.initializeApp({credential: this.admin.credential.cert(serviceKey)}, 'admin-auth');

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	}

	/**
	 * Signing in an user and tries to get their id token.
	 *
	 * @param  {String} email - Email for the account
	 * @param  {String} password - Password for the account
	 * @promise {String} Returns a string with the id token of the user.
	 * @rejects {Object} Returns an object with errors if rejected
	 */
	signIn(email, password) {
		return this.firebase.auth().signInWithEmailAndPassword(email, password)
			.then(() => {
				return this.getIdToken();
			})
			.catch((error) => {
				throw { code: error.code, message: error.message };
			});
	}

	/**
	 * Gets the id token from the logged in user.
	 *
	 * @promise {String} Returns a string with the id token of the user.
	 * @rejects {Object} Returns an object with errors if rejected
	 */
	getIdToken() {
		return this.firebase.auth().currentUser.getIdToken(true)
			.then((idToken) => {
				return idToken;
			}).catch((error) => {
				throw { code: error.code, message: error.message };
			});
	}

	/**
	 * Verify the id token of an user.
	 *
	 * @promise {Boolean} Returns true if successful
	 * @rejects {Object} Returns an object with errors if rejected
	 */
	authToken(idToken) {
		return this.admin.auth().verifyIdToken(idToken)
			.then(() => {
				return true;
			}).catch((error) => {
				throw { code: error.code, message: error.message };
			});
	}
}

module.exports = FirebaseAuth;