WordPress Redirect any pages that are in draft/trash for non login users to the home page

function.php

<?php
//redirect any draft/trashed posts
add_action('wp', 'trash_redirect');
function trash_redirect(){
    if ( !current_user_can( 'edit_pages' ) ) {
	    if (is_404()){
	        global $wp_query, $wpdb;
	        $page_id = $wpdb->get_var( $wp_query->request );
	        $post_status = get_post_status( $page_id );
	        if($post_status == 'trash' || $post_status == 'draft'){
	            wp_redirect(home_url(), 302);
	            die();
	        }
	    }
	}
}

Updated to a 302 as if a once published page does come back it it used the correct header response.

Hi! Thank you for the sample code! I noticed a problem with custom posts. Hook 'template_redirect' is called too late. Example:

1. Type: site.com/courses/java
2. Redirect 301: site.com/?post_type=course&p=28871‎ (some magic from wordpress)
3. Redirect 302: site.com (redirect from your example)

I had to apply this hook:
add_action('wp', 'trash_redirect');

Thx for sharing this snippet - it works fine. I did use it with applying the addition at the comments from pe-pe80.

Updated to apply the hook on add_action('wp', 'trash_redirect'); over add_action('template_redirect', 'trash_redirect'); to work with custom post type

@TimBHowe thanks so much for this!
I made a version that allows for redirecting to a custom url:
https://gist.github.com/contemplate/11737073fdc24ac79216ff86a05f9fe4