nwrox

# Bash best practices and style-guide

Just simple methods to keep the code clean.

Inspired by [progrium/bashstyle](https://github.com/progrium/bashstyle) and [Kfir Lavi post](http://www.kfirlavi.com/blog/2012/11/14/defensive-bash-programming/).


## Quick big rules
* All code goes in a function
* Always double quote variables

nwrox

# boot-url points to an nfs URL
# sanboot-url points to an http URL
# ubuntu-version contains 18.04.3
# ubuntu-release contains bionic

:ubuntu
echo Booting Ubuntu from iSCSI for ${initiator-iqn}
set root-path ${base-iscsi}:${hostname}.boot.ubuntu
sanboot ${root-path} || goto failed
goto start

nwrox

public byte[] Unprotect(byte[] protectedData)
{
    if (protectedData?.Length < 1)
    {
        return null;
    }

    var keyId = new byte[16];
    var magicHeader = new byte[4];
    var purposes = _appOptions.CookieAadPurposes;

nwrox

var appOptions = _conf.GetSection("AppOptions");
var purposes = appOptions.GetSection("CookieAadPurposes")
    .GetChildren();

services.AddCors(options =>
{
    options.AddPolicy(CorsPolicyName,
        //.AllowCredentials()
        builder => builder.AllowAnyHeader()
            .AllowAnyMethod()

nwrox

///This is a Frankenstein class that can extract the AES key from a KDK as described in:
/// https://docs.microsoft.com/en-us/aspnet/core/security/data-protection/implementation/subkeyderivation?view=aspnetcore-2.2
///With a bit of luck, this should let an ASP.NET app decrypt cookies generated by an ASPNETCore app
///Still consult https://docs.microsoft.com/en-us/aspnet/core/security/cookie-sharing?view=aspnetcore-2.2 to share cookies
///Credit for most of the code is from various parts of https://github.com/aspnet/AspNetCore/tree/master/src/DataProtection/DataProtection/src

public unsafe class CookieDataProtector : IDataProtector
{
    readonly string _base64MasterKey;

nwrox

{
  "comments": [
    {
      "x": "2019/06/05",
      "y": "4"
    },
    {
      "x": "2019/05/29",
      "y": "6"
    },

nwrox

https://blog.guya.net/2015/06/12/sharing-sessionstorage-between-tabs-for-secure-multi-tab-authentication/

nwrox

{
  "a": 1
}

nwrox

const m1 = Array.from({ length: 11 }, (k, v) => v)
  .reverse()
  .slice(0, 9)
const m2 = Array.from({ length: 12 }, (k, v) => v)
  .reverse()
  .slice(0, 10)

let tempCpf;
let digito;
let soma;

nwrox

# initialization file (not found)