#!/usr/bin/env bash

newsshuser() {
  USER="$1"
  shift
  SSH_PUBLIC_KEY="$*"
  PASSWORD=$(< /dev/urandom tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)
  sudo adduser "${USER}"
  echo "${USER}":"${PASSWORD}" | sudo chpasswd
  sudo usermod -a -G sudo "${USER}"
  sudo mkdir /home/"${USER}"/.ssh
  echo "${SSH_PUBLIC_KEY}" | sudo tee -a /home/"${USER}"/.ssh/authorized_keys
  sudo chmod 755 /home/"${USER}"/.ssh
  sudo chmod 644 /home/"${USER}"/.ssh/authorized_keys
  sudo chown -R "${USER}"."${USER}" /home/"${USER}"/.ssh
  echo "Created new user ${USER} with password '${PASSWORD}'."
}

if declare -f "$1" > /dev/null
then
  "$@"
else
  echo "'$1' is not a known function name, try newsshuser" >&2
  exit 1
fi

# Example sh tools.sh newsshuser johns ssh-rsa ABCDE...FGHIabcdX== johns@smith.com