Shortcode to Hide a Section of Content from Everyone but the Author

I am trying to create a shortcode that I can wrap around a piece of content to hide ot from everyone but the author who wrote the content. (I want to use it for an “edit this post” link). I am using this:

function authoronly( $atts, $content = null ) {
if(
    is_user_logged_in() and // Force user validation... STUFF
    !empty($GLOBALS['post']) and // Check if a $post exists in globals
    !empty($GLOBALS['current_user']) and // Check if current_user exists in globals
    ($GLOBALS['current_user']->ID == $GLOBALS['post']->post_author) // Match User IDs
){ $content
}
add_shortcode("authoronly", "authoronly");

I think the nested brackets are causing the problem. Any suggesion?

Thanks