Yury Batenko svenyurgensson

Export Google Authenticator secret OTP-keys

I recently got myself a Yubikey and wanted to set up the Yubico Authenticator with all the OTPs I had in Google Authenticator. Unfortunately Yubico Authenticator doesn't support scanning the QR-code that the Google Authenticator generates when you export the OTP-keys, and it seemed like quite the daunting task to log in to every service to generate new OTP-keys. So I decided to have a look at the contents of the QR code, to see if I could import the keys into Yubico Authenticator in one go. Luckily I found a blog post by Alex Bakker that describes the data format.

Transfer QR-code to computer

Unfortunately, but likely for the best, the security policy of Google Authenticator won't allow you to take a screenshot of

The driver situation with Apple Bluetooth wireless keyboards and Windows 10 is horrible, even with the latest BootCamp drivers. Fortunately, a workaround is available, if you're patient.

Pair keyboard once

Turn on the keyboard.
Press and hold Command + w until the keyboard light begins blinking, indicating the keyboard is ready to pair.
Use Windows Bluetooth settings to pair the keyboard, entering the same code (e.g. 123456 Enter) on both internal and external keyboards.

Pairing the keyboard is very trial and error. 9/10 times, Windows will complain that the keyboard is not available for pairing. Just keep trying.

#!/bin/ruby --verion => 2.0.0-p353

Self

In Ruby, self is a special variable that always references the current object.

Inside class or module definition, self refer to the Class or Module object.
Inside instance method, self refer to future instance object.
Inside class method, self refer to the class.i

This is a SCRIPT-8 cassette.

Some nginx example confs

https://mattbrictson.com/nginx-reverse-proxy-cache

https://www.nginx.com/resources/wiki/start/topics/examples/full/

https://gist.github.com/weapp/9a3fd2c068cb206e9d40

https://gist.github.com/weapp/c1a88f6fe16dc2c14061

Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

	#!/bin/bash
	RELEASE_API="https://api.github.com/repos/heiher/hev-socks5-tunnel/releases/latest"
	BIN_DST_DIR=/usr/local/bin
	RESOURCE_DST_DIR=/usr/local/etc/hev-socks5-tunnel

	function getReleaseInfo() {
	response=$(curl ${RELEASE_API})
	if [ $? == 0 ]; then
	echo $response
	return 0

	# THMC Инструкция по подключению к VPN (AmneziaVPN / AmneziaWG)

	## 1. Установка клиента

	В зависимости от устройства используем разные клиенты:

	- 📱 Телефон / планшет
	- iOS (за пределами РФ): устанавливаем AmneziaVPN из App Store.
	- iOS (в регионе РФ): AmneziaVPN недоступен — используем AmneziaWG.
	- Android: устанавливаем AmneziaVPN из Play Market (доступен и в РФ).

	#!/bin/bash
	set -e
	export DEBIAN_FRONTEND=noninteractive

	LOG_FILE="/tmp/amneziawg_install.log"
	RESULT_FILE="/tmp/amneziawg_install_result.log"
	AWG_WORKDIR=~/awg

	echo "Начало установки AmneziaWG" > $LOG_FILE
	echo "Не завершено" > $RESULT_FILE

	(require 'org)

	(setq-default indent-tabs-mode nil)
	(setq org-display-inline-images t)
	(setq org-redisplay-inline-images t)
	(setq org-startup-with-inline-images "inlineimages")

	(setq default-frame-alist
	(append (list '(width . 72) '(height . 40))))