die() {
    echo "$@" >&2
    exit 1
}

magic='$z$'
redis_socket=$1
read -p "Username: " username
read -s -p "Password: " password
echo
read -s -p "Confirm your password: " password_conf
echo
if [[ $password != $password_conf ]]; then
    die "Passwords don't match"
fi

salt=$(tr -dc A-Za-z0-9 </dev/urandom | head -c 13)

encoded_hash=$({ echo -n $magic; echo -n $password; echo -n $salt; } | sha512sum - \
    | xxd -r -p | od -tx1 - | sed -e 's/^[0-9]* //' -e '$d' -e 's/^/ /' -e 's/ /\\x/g' | tr -d '\n')
redis-cli -s $redis_socket set salt:$username $salt || die "Failed to send redis command"
echo \'\"$encoded_hash\"\' | xargs -n 1 redis-cli --quoted-input -s $redis_socket set hash:$username || die "Failed to send redis command"