lautarodragan

const JSONLD = require('jsonld')

const jsonld = JSONLD // try commenting this line
// const jsonld = JSONLD() // and uncommenting this one

const DefaultClaimContext = {
  cred: 'https://w3id.org/credentials#',
  schema: 'http://schema.org/',
  sec: 'https://w3id.org/security#',

lautarodragan

import { bufferToHex, ecrecover, fromRpcSig, hashPersonalMessage, publicToAddress } from 'ethereumjs-util'

export function signatureIsValid(address: string, message: string, signature: string): boolean {
  const msgHash = hashPersonalMessage(Buffer.from(message))

  const signatureParams = fromRpcSig(signature)
  const publicKey = ecrecover(
    msgHash,
    signatureParams.v,
    signatureParams.r,

lautarodragan

// https://en.bitcoin.it/wiki/Wallet_import_format

const crypto = require('crypto');
const base58 = require('base-58')

const sha256 = buffer => crypto.createHash('sha256').update(buffer).digest()

const privateKeyToWIF = (privateKey, prefix = 'ef', compressed = '01') => {
  const prefixedPrivateKey = prefix + privateKey + compressed
  const prefixedPrivateKeyBuffer = Buffer.from(prefixedPrivateKey, 'hex')

lautarodragan

This mini-project compares frequencies of letters in the English language in general and an extract from Frank Herbert's Dune.

The average letter frequencies can be found in letter-frequencies.json. This file is a JSON object mapping letters to frequencies, and looks like this:

{
  "E": 11.1607,
  "M": 3.0129,
  "A": 8.4966,
  "H": 3.0034,

lautarodragan

syntax = "proto3";

import "google/protobuf/wrappers.proto";

message MyHappyProto {
  string id = 1;
  google.protobuf.StringValue name = 2;
  google.protobuf.StringValue address = 3;
  google.protobuf.StringValue something = 4;
  google.protobuf.StringValue nullable = 5;

lautarodragan

Install YubiKey Manager

Yubico docs: https://developers.yubico.com/yubikey-manager/

Right now, Yubico distributes yubikey-manager under the official ppa yubico/stable for apt. Double-check this is still the case when you're reading this guide — you don't want to trust a non-official distribution of yubikey-manager.

sudo apt-add-repository ppa:yubico/stable
sudo apt update
sudo apt install yubikey-manager

lautarodragan

Pop!_OS Theme Toggle Keyboard Shortcut

This script toggles both the Pop!_OS theme between Pop-dark and Pop and the gnome color-theme preference between prefer-light and prefer-dark at once. We need to toggle both because some apps use one and some the other. In particular, the CSS feature that allows detection of user preferences uses org.gnome.desktop.interface color-scheme, while native apps mostly use the gtk-theme.

To use it, you could just run the script manually from a terminal (. theme-toggle.sh or chmod a+x theme-toggle.sh and then ./theme-toggle.sh), but that's no fun.

Instead, you can add a desktop-wide keyboard shortcut that triggers this script.

To do so, open Settings (gnome-control-center) and go to Keyboard > Keyboard Shortcuts > View and Customize Keyboard Shortcuts.

lautarodragan

type DeepReadonly<T> = {
  readonly [P in keyof T]: T[P] extends Record<string, unknown>
    ? DeepReadonly<T[P]>
    : T[P];
};

lautarodragan

@echo off

::::: p4ftp.bat :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: A little Windows Batch Script to upload a Perforce ChangeList from console to a FTP host 
:: 
:: first argument is the change list number, and is mandatory.
:: second argument is an optional "1" flag, indicating no confirmation is desired.
::
:: usage (from console): p4ftp.bat <cl> [1]

lautarodragan

@echo off

::::: p4backup.bat :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
::
:: A tiny Windows Batch Script to backup a Perforce Server 
:: 
:: arguments:
:: 		(none)
::
:: usage: