docker-entrypoint.js

const {
	HOST,
	PORT,
	KEY_LENGTH,
	MAX_LENGTH,
	STATIC_MAX_AGE,
	RECOMPRESS_STATIC_ASSETS,
	STORAGE_TYPE,
	STORAGE_HOST,
	STORAGE_PORT,
	STORAGE_EXPIRE_SECONDS,
	STORAGE_DB,
	STORAGE_AWS_BUCKET,
	STORAGE_AWS_REGION,
	STORAGE_PASSWORD,
	STORAGE_USERNAME,
	STORAGE_FILEPATH,
	LOGGING_LEVEL,
	LOGGING_TYPE,
	LOGGING_COLORIZE,
	KEYGENERATOR_TYPE,
	KEY_GENERATOR_KEYSPACE,
	RATE_LIMITS_NORMAL_TOTAL_REQUESTS,
	RATE_LIMITS_NORMAL_EVERY_MILLISECONDS,
	RATE_LIMITS_WHITELIST_TOTAL_REQUESTS,
	RATE_LIMITS_WHITELIST_EVERY_MILLISECONDS,
	RATE_LIMITS_WHITELIST,
	RATE_LIMITS_BLACKLIST_TOTAL_REQUESTS,
	RATE_LIMITS_BLACKLIST_EVERY_MILLISECONDS,
	RATE_LIMITS_BLACKLIST,
	DOCUMENTS
} = process.env;

const config = {
	host: HOST,
	port: Number(PORT),

	keyLength: Number(KEY_LENGTH),

	maxLength: Number(MAX_LENGTH),

	staticMaxAge: Number(STATIC_MAX_AGE),

	recompressStaticAssets: RECOMPRESS_STATIC_ASSETS,

	logging: [
		{
			level: LOGGING_LEVEL,
			type: LOGGING_TYPE,
			colorize: LOGGING_COLORIZE
		}
	],

	keyGenerator: {
		type: KEYGENERATOR_TYPE,
		keyspace: KEY_GENERATOR_KEYSPACE
	},

	rateLimits: {
		whitelist: RATE_LIMITS_WHITELIST ? RATE_LIMITS_WHITELIST.split(',') : [],
		blacklist: RATE_LIMITS_BLACKLIST ? RATE_LIMITS_BLACKLIST.split(',') : [],
		categories: {
			normal: {
				totalRequests: RATE_LIMITS_NORMAL_TOTAL_REQUESTS,
				every: RATE_LIMITS_NORMAL_EVERY_MILLISECONDS
			},
			whitelist:
				RATE_LIMITS_WHITELIST_EVERY_MILLISECONDS || RATE_LIMITS_WHITELIST_TOTAL_REQUESTS
					? {
							totalRequests: RATE_LIMITS_WHITELIST_TOTAL_REQUESTS,
							every: RATE_LIMITS_WHITELIST_EVERY_MILLISECONDS
					  }
					: null,
			blacklist:
				RATE_LIMITS_BLACKLIST_EVERY_MILLISECONDS || RATE_LIMITS_BLACKLIST_TOTAL_REQUESTS
					? {
							totalRequests: RATE_LIMITS_WHITELIST_TOTAL_REQUESTS,
							every: RATE_LIMITS_BLACKLIST_EVERY_MILLISECONDS
					  }
					: null
		}
	},

	storage: {
		type: STORAGE_TYPE,
		host: STORAGE_HOST,
		port: Number(STORAGE_PORT),
		expire: Number(STORAGE_EXPIRE_SECONDS),
		bucket: STORAGE_AWS_BUCKET,
		region: STORAGE_AWS_REGION,
		connectionUrl: `postgres://${STORAGE_USERNAME}:${STORAGE_PASSWORD}@${STORAGE_HOST}:${STORAGE_PORT}/${STORAGE_DB}`,
		db: STORAGE_DB,
		user: STORAGE_USERNAME,
		password: STORAGE_PASSWORD,
		path: STORAGE_FILEPATH
	},

	documents: DOCUMENTS
		? DOCUMENTS.split(',').reduce((acc, item) => {
				const keyAndValueArray = item.replace(/\s/g, '').split('=');
				return { ...acc, [keyAndValueArray[0]]: keyAndValueArray[1] };
		  }, {})
		: null
};

console.log(JSON.stringify(config));