SSL/TLS Handshake (TLS 1.2 with RSA)

One-way SSL

sequenceDiagram
    autonumber
    participant Client
    participant Server
    participant CA as Certificate Authority

khiet / github_img_table.js

Last active May 11, 2021 21:07

Format images in table in Github description

	const textarea = document.querySelector('textarea[name="pull_request[body]"]');
	const text = textarea.value;
	const lines = text.split("\n")
	const images = lines.filter(line => {
	return line.includes("https://user-images");
	});

	let output = '';
	let imgs = images.map(image => {
	const match = image.match(/$(.*?)$/);

khiet / private_protected.rb

Last active May 3, 2021 06:54

private and protected in Ruby

khiet / maintenance.html

Created August 23, 2019 08:48

ehochef maintenance page based on heroku's

	<!doctype html>
	<html>
	<head>
	<meta charset=utf-8>
	<meta content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" name=viewport>
	<title>Offline for maintenance \| ehochef.com </title>
	<link rel="shortcut icon" type="image/x-icon" href="https://eho-production.s3-eu-west-1.amazonaws.com/maintenance/favicon.ico">
	<style>
	html,
	body {

khiet / servo_sg90.py

Created June 20, 2019 19:12

RPi Servo SG90 https://www.youtube.com/watch?v=ddlDgUymbxc

	import RPi.GPIO as GPIO
	import time

	GPIO.setmode(GPIO.BOARD)
	GPIO.setup(7,GPIO.OUT)

	# https://www.youtube.com/watch?v=ddlDgUymbxc
	# SG90 angle and pulse width
	# 0: 0.5 ms
	# neutral: 1.5 ms

khiet / cookie.js

Created April 24, 2018 14:56

Cookie manipulation in JS

khiet / rails-6-redirect-www.rb

Last active July 8, 2020 09:16

Rails 5 redirect root domain to www and vice versa

	# example.com => www.example.com
	match '(*any)', to: redirect(subdomain: 'www'), via: :all, constraints: { subdomain: false }
	# www.example.com => example.com
	match '(*any)', to: redirect(subdomain: false), via: :all, constraints: {subdomain: 'www'}

	# caveat
	# subdomain is anything from 3rd level domain, so for example.co.uk domains the syntax will be the following:
	# example.co.uk => www.example.co.uk
	match '(*any)', to: redirect(subdomain: 'www.example'), via: :all, constraints: { subdomain: 'example' }
	# www.example.co.uk => example.co.uk

khiet / mysql_backup.sh

Last active September 1, 2015 20:52

	#!/bin/bash

	BACKUP_DIR="/home/dumps/"
	S3_PATH="s3://sunbury-dental-production/dumps/"

	# create a dump
	mysqldump -u$DB_USER -p$DB_PASSWORD dental_production > /home/dumps/production_dump_$(date +\%m\%d\%y).sql

	# delete old dumps
	find $BACKUP_DIR -type f -name "mysql_dump_*.sql.gz" -mtime +10 -daystart \| xargs rm -rf

khiet / kill_racks.rb

Created April 6, 2014 08:06

	time = ARGV[0]
	dry_run = ARGV[1] == '--dry'
	puts "Killing stale servers older than #{time}"
	puts "*DRY RUN*" if dry_run

	output = `for i in {1..36}; do echo web$i; ssh deploy@web$i.housetrip.com "ps aux \| grep [R]ack" \| grep -v "#{time}" \| awk '{ print $2 }'; done`

	server = nil

	output.split("\n").each do \|line\|

khiet / gbgrep

Last active August 29, 2015 13:57 — forked from nas/gbgrep

	function setCookie(cname, cvalue, exdays, cpath) {
	var d = new Date();
	d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
	var expires = "expires="+d.toUTCString();
	document.cookie = cname + "=" + cvalue + ";" + expires + ";path=" + cpath;
	}

	function getCookie(cname) {
	var name = cname + "=";
	var ca = document.cookie.split(';');