WIP

Usage:

authentication.service.js

const AuthService         = require('moleculer-auth');

module.exports = {
	name: "authentication",
	mixins: [AuthService],

	/**
	 * Default settings
	 */
	settings: {
	    providers: {
            google: {
                client: {
                    id: 'oauth2-google-id',
                    secret: 'oauth2-google-isecret'
                },
                redirect_uri: 'http://localhost:3000/auth/google/callback'
            },
            facebook: {
                 client: {
                     id: 'facebook-id',
                     secret: 'facebook-secret'
                 },
                 redirect_uri: 'http://localhost:3000/auth/facebook/callback'
            },
            twitter: {
                client: {
                    id: 'twitter-id',
                    secret: 'twitter-secret'
                },
                redirect_uri: 'http://localhost:3000/auth/twitter/callback'
            }
	    }
	},
};

Api gateway service:

...
    aliases: {
        "GET /auth/:provider/login"(route, req, res) {
            this.login(route, req, res)
        },
        "GET /auth/:provider/callback"(route, req, res) {
            this.callback(route, req, res)
        },
        // Login
        // "POST /users/login": "users.login"
    },
    
    methods: {

        login(route, req, res){
            this.broker.call('authentication.getAuthorizationURI', {provider: route.$params.provider})
                .then(
                    uri => this.sendRedirect(req, uri)
                );
        },

        callback(route, req, res){

            this.broker.call('authentication.login', {provider: route.$params.provider, query: route.query})
                .then(id => "store user_id in session")
                .catch(error => {
                    this.logger.error(error);
                });
            // })
        },
        ...
...