moleculer-web-uws/src/utils.js

The `moleculer-web-uws` is a fast API gateway service for Moleculer based on µWebSockets.js server. Use it to publish your services over HTTP and WebSockets.

'use strict';

const etag	= require('etag');
const { BadRequestError, ERR_UNABLE_DECODE_PARAM } = require('./errors');

function isObject(obj) {
	return obj !== null && typeof obj === 'object';
}

function isFunction(obj) {
	return typeof obj === 'function';
}

function isString(obj) {
	return typeof obj === 'string'
}

function isNumber(obj) {
	return typeof obj === 'number';
}

function isStream(obj) {
	return isObject(obj) && isFunction(obj.pipe);
}

function isReadableStream(stream) {
	return isStream(stream) && stream.readable !== false && isFunction(stream._read) && typeof stream._readableState === 'object';
}

function decodeParam(param) {
	try {
		return decodeURIComponent(param);
	} catch (err) {
		throw new BadRequestError(ERR_UNABLE_DECODE_PARAM, { param });
	}
}

function removeTrailingSlashes(s) {
	if (s[0] === '/')
		s = s.slice(1);
	if (s[s.length - 1] === '/')
		s = s.slice(0, -1);
	return s;
}

function addSlashes(s) {
	return (s[0] === '/' ? '' : '/') + s + (s[s.length - 1] === '/' ? '' : '/');
}

function normalizePath(s) {
	return s.replace(/\/{2,}/g, '/');
}

function generateETag(body, opt) {
	if (isFunction(opt))
		return opt.call(this, body);

	let buf = !Buffer.isBuffer(body)
		? Buffer.from(body)
		: body;

	return etag(buf, (opt === true || opt === 'weak') ? { weak: true } : null);
}

module.exports = {
	isObject,
	isFunction,
	isString,
	isNumber,
	isReadableStream,
	removeTrailingSlashes,
	addSlashes,
	normalizePath,
	decodeParam,
	generateETag
};