2FA from the mac command line using oathtool-toolkit without much fuss

2fa

#!/bin/bash

# -*- 2fa Command Line -*-
#
# Uses oath-toolkit http://nongnu.org/oath-toolkit/
# to generate 2FA OTPs and copies them in the Mac's
# clipboard using pbcopy(1). For other UNIX systems
# you can just strip the pbcopy at the bottom.
#
# In the dir below you should put TOTP token seeds,
# one per file, naming it after the service you are
# authenticating against.
#
# Each service uses different approaches to let you
# know (or to try to prevent you from knowing) your
# TOTP seed: it's up to you to find it out. Anyway,
# for TOTP to work, you *need* the seed, so it will
# be hidden, somewhere, for you to find out.
#
#  - vjt@openssl.it  Thu Oct 12 22:53:11 CEST 2017
#
#     WTFPL license (http://www.wtfpl.net/)
#
BASEDIR=~/Documents/2fa

service=$1

if [ -z "$service" ]; then
  echo "Usage: $0 <service>"
  exit 1
fi

if ! echo "$service" | grep -Eq '[a-zA-Z0-9]+'; then
  echo "Invalid service name: $service"
  exit 2
fi

file="$BASEDIR/$service"

if [ ! -f "$file" ]; then
  echo "Unknown service: $service"
  exit 3;
fi

code=$(cat $file)
oathtool --totp -b "$code" | pbcopy
echo "Copied to the clipboard"