Automate GitHub GPG Key Setup

github-gpg-key-setup.sh

#!/usr/bin/env sh

# ASCII: http://patorjk.com/software/taag/#p=display&f=Graffiti&t=Create%20Github%20GPG%20Key
# SOURCE: https://gist.github.com/Gerst20051/

function double_echo {
  echo && echo
}

function newline {
  echo
}

bold=$(tput bold)
normal=$(tput sgr0)

function init {
  echo
  print_purpose_header && double_echo
  confirm_continue && double_echo
  prompt_gpg_passphrase && double_echo
  print_finished_header && double_echo
}

function print_purpose_header {
  echo '_________                        __             ________.__  __  .__         ___.       __________________  ________   ____  __.            '
  echo '\_   ___ \_______   ____ _____ _/  |_  ____    /  _____/|__|/  |_|  |__  __ _\_ |__    /  _____/\______   \/  _____/  |    |/ _|____ ___.__.'
  echo '/    \  \/\_  __ \_/ __ \\__  \\   __\/ __ \  /   \  ___|  \   __\  |  \|  |  \ __ \  /   \  ___ |     ___/   \  ___  |      <_/ __ <   |  |'
  echo '\     \____|  | \/\  ___/ / __ \|  | \  ___/  \    \_\  \  ||  | |   Y  \  |  / \_\ \ \    \_\  \|    |   \    \_\  \ |    |  \  ___/\___  |'
  echo ' \______  /|__|    \___  >____  /__|  \___  >  \______  /__||__| |___|  /____/|___  /  \______  /|____|    \______  / |____|__ \___  > ____|'
  echo '        \/             \/     \/          \/          \/              \/          \/          \/                  \/          \/   \/\/     '
}

function confirm_continue {
  echo '_________                _____.__                 _________                __  .__                      '
  echo '\_   ___ \  ____   _____/ ____\__|______  _____   \_   ___ \  ____   _____/  |_|__| ____  __ __   ____  '
  echo '/    \  \/ /  _ \ /    \   __\|  \_  __ \/     \  /    \  \/ /  _ \ /    \   __\  |/    \|  |  \_/ __ \ '
  echo '\     \___(  <_> )   |  \  |  |  ||  | \/  Y Y  \ \     \___(  <_> )   |  \  | |  |   |  \  |  /\  ___/ '
  echo ' \______  /\____/|___|  /__|  |__||__|  |__|_|  /  \______  /\____/|___|  /__| |__|___|  /____/  \___  >'
  echo '        \/            \/                      \/          \/            \/             \/            \/ '

  double_echo

  local CONTINUE_CONFIRM=''
  until [ "$CONTINUE_CONFIRM" = 'run' ]; do
    read -p 'type "run" to continue: ' CONTINUE_CONFIRM
  done
}

function prompt_gpg_passphrase {
  echo '  __________________  ________  __________                              .__                                '
  echo ' /  _____/\______   \/  _____/  \______   \_____    ______ ____________ |  |______________    ______ ____  '
  echo '/   \  ___ |     ___/   \  ___   |     ___/\__  \  /  ___//  ___/\____ \|  |  \_  __ \__  \  /  ___// __ \ '
  echo '\    \_\  \|    |   \    \_\  \  |    |     / __ \_\___ \ \___ \ |  |_> >   Y  \  | \// __ \_\___ \\  ___/ '
  echo ' \______  /|____|    \______  /  |____|    (____  /____  >____  >|   __/|___|  /__|  (____  /____  >\___  >'
  echo '        \/                  \/                  \/     \/     \/ |__|        \/           \/     \/     \/ '

  double_echo

  # the gpg key can be edited to change or remove the passphrase (the public key will stay the same)
  # [$]> gpg --edit-key $(grep gpg_key ~/.secrets/vars/macmini.yml | cut -d\  -f2)
  # gpg> passwd

  if [ -z ${gpg_key+x} ]; then
    echo 'A passphrase should be at least 8 characters long.'
    echo 'A passphrase should contain at least 1 digit or special character.'
    # TODO: verify that the passphrase satisfies these constraints so that gpg doesn't throw an error

    double_echo

    # TODO: add support for not setting a passphrase

    while true; do
      read -s -p 'gpg passphrase: ' gpg_passphrase
      echo
      read -s -p 'gpg passphrase (confirm): ' gpg_passphrase_confirm
      echo
      [ ${#gpg_passphrase} -ge 8 ] && [ "$gpg_passphrase" = "$gpg_passphrase_confirm" ] && break
      echo
      echo 'bad passphrase please re-enter this passphrase'
      echo
    done
  else
    echo "using gpg key \"$gpg_key\""
  fi
}

function print_finished_header {
  echo '___________.__       .__       .__               .___   ________.__  __  .__         ___.       __________________  ________   ____  __.            '
  echo '\_   _____/|__| ____ |__| _____|  |__   ____   __| _/  /  _____/|__|/  |_|  |__  __ _\_ |__    /  _____/\______   \/  _____/  |    |/ _|____ ___.__.'
  echo ' |    __)  |  |/    \|  |/  ___/  |  \_/ __ \ / __ |  /   \  ___|  \   __\  |  \|  |  \ __ \  /   \  ___ |     ___/   \  ___  |      <_/ __ <   |  |'
  echo ' |     \   |  |   |  \  |\___ \|   Y  \  ___// /_/ |  \    \_\  \  ||  | |   Y  \  |  / \_\ \ \    \_\  \|    |   \    \_\  \ |    |  \  ___/\___  |'
  echo ' \___  /   |__|___|  /__/____  >___|  /\___  >____ |   \______  /__||__| |___|  /____/|___  /  \______  /|____|    \______  / |____|__ \___  > ____|'
  echo '     \/            \/        \/     \/     \/     \/          \/              \/          \/          \/                  \/          \/   \/\/     '
}

init