Allen Kim allenhwkim

Get reCAPTCHA key and secret from Google site, https://www.google.com/recaptcha/admin/create
- Store your key and secret in a safe place
Code public/index.html (update {{KEY}})
Code server.js (update {{SECRET}})
Run your server
```
$ npm i
$ node server.js
```
Open browser, http://localhost:3000, and click "Submit"

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>Form controls and validation</title>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width" />
	</head>
	<body>

	<form onsubmit="handleSubmit(event)" noValidate> <!-- noValidate -->

	function reverseString(str) {
	return !str ? '' : reverseString(str.substr(1)) + str.charAt(0);
	}
	reverseString("hello");

	function reverse(str){
	for (var i = str.length - 1, s=""; i >= 0; i--) s += str[i];
	return s;
	};
	reverse("your string comes here")

	function isBase64(v) {
	if (typeof v !== 'string') return false;

	const regEx = /^(?:[A-Za-z0-9+\\/]{4})*(?:[A-Za-z0-9+\\/]{2}==\|[A-Za-z0-9+\/]{3}=)?$/gi;
	const isBase64 = regEx.test(v);
	return isBase64;
	}

	// Test
	var pngString = 'iVBORw0KGgoAAAANSUhEUgAABQAAAALQAQMAAAD1s08VAAAAA1BMVEX/AAAZ4gk3AAAAh0lEQVR42u3BMQEAAADCoPVPbQlPoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB4GsTfAAGc95RKAAAAAElFTkSuQmCC';

	class Storage {

	static getItem(key) {
	if (key.match(/^([a-z0-9]+)\[['"]?(.*?)['"]?\]$/i)) { // array format e.g., groupName["foo"]
	const [_, groupKey, itemKey] = key.match(/^([a-z0-9]+)\[['"]?(.*?)['"]?\]$/i);
	const storageData = sessionStorage.getItem(groupKey);
	const storageObj = JSON.parse(storageData);
	return storageObj?.[itemKey];
	} else if (key.match(/^([a-z0-9]+)\.([a-z0-9]+)/i)) { // key format groupName.foo
	const [groupKey, itemKey] = key.split('.');

	import * as crypto from 'crypto';
	import * as zlib from 'zlib';
	const assert = require('assert');

	const encrypt = (val, password='p@55w07d') => {
	const key = password.repeat(16).substring(0, 32);
	const iv = key.substring(0, 16).split('').reverse().join('');
	let cipher = crypto.createCipheriv('aes-256-cbc', key, iv);
	let encrypted = cipher.update(val, 'utf8', 'base64');
	return (encrypted + cipher.final('base64')).replace(/[=]+/,'');

	import pako from 'pako';

	// Usage:
	// console.log(compress('hello'), decompress(compress('hello')));

	export function compress(str) {
	var unit8arr = pako.deflate(str);
	return base64EncArr(unit8arr);
	}

	import { disableBodyScroll, enableBodyScroll } from 'body-scroll-lock';

	// usage example:
	// <resize-handle bottom left></resize-handle>
	// <resize-handle bottom left single></resize-handle>

	export class ResizeHandle extends HTMLElement {
	static css = `
	resize-handle { position: absolute; }
	resize-handle:after { content: ' '; display: block; width: 12px; height: 12px; opacity: .5; }

	[ req ]
	default_bits = 2048
	default_keyfile = server-key.pem
	distinguished_name = subject
	req_extensions = req_ext
	x509_extensions = x509_ext
	string_mask = utf8only

	# The Subject DN can be formed using X501 or RFC 4514 (see RFC 4519 for a description).
	# Its sort of a mashup. For example, RFC 4514 does not provide emailAddress.

	import express from 'express';
	import session from 'express-session';
	import crypto from 'crypto';
	import { Issuer, generators, TokenSet } from 'openid-client';

	declare module 'express-session' {
	export interface SessionData {
	tokenSet: TokenSet;
	state: string;
	codeVerifier: string;