bookbrainz/bookbrainz-site

import Debug from 'debug';
import RedisStore from 'connect-redis';
import {get as _get} from 'lodash';
import config from './config';
import redisClient from './cache';
import session from 'express-session';


type Session = {
    cookie: any,
    mergeQueue?: any,
    resave: boolean,
    saveUninitialized: boolean,
    secret: any,
    store?: any
};

declare module 'express-serve-static-core' {
    interface Request {
        session: Session;
    }
}

const debug = Debug('bbsite');

/**
 * Set up sessions, using Redis in production and default to in-memory for testing environment.
 * @param {string} [environment] - Node.js environment.
 * @returns {function} Express session request handler.
 */
function setupSessions(environment) {
    const sessionOptions: Session = {
        cookie: {
            maxAge: _get(config, 'session.maxAge', 2592000000),
            secure: _get(config, 'session.secure', false)
        },
        resave: false,
        saveUninitialized: false,
        secret: config.session.secret
    };

    if (environment !== 'test') {
        redisClient.connect().catch((redisError) => debug('Redis error:', redisError));

        redisClient.on('error', (redisError) => debug('Redis error:', redisError));

        const redisStore = new RedisStore({
            client: redisClient
        });
        sessionOptions.store = redisStore;
    }

    return session(sessionOptions);
}

export default setupSessions;