#!/bin/sh

validate_secret_file() {
  secret_path=$1
  secret_name=$2
  if [ ! -f "$secret_path" ] || [ ! -r "$secret_path" ] || [ ! -s "$secret_path" ]; then
    echo "$secret_name must be a readable, non-empty regular file" >&2
    return 2
  fi
  if LC_ALL=C grep -q '[[:space:]]' "$secret_path"; then
    echo "$secret_name must contain no whitespace" >&2
    return 2
  fi
}

read_secret_file() {
  validate_secret_file "$1" "$2" || return
  cat "$1"
}