Cancel post save

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I need to abort the post saving process when the post content contains a specific string and then display a message to the user.

I found a method to display the message but didn’t find a way to refuse post saving.

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So far here’s what i’ve done 

 add_action( "pre_post_update", "checkPost");
 function checkPost($post_ID) {
      $post = get_post($post_ID);

      $postContent = $post->post_content;

      if ( wp_is_post_revision( $post_ID  ) )
           return;

      if(preg_match("/bad string/", $postContent) == 1) {

           //
           // cancel post save
           //

           // then
           add_filter("redirect_post_location", "my_redirect_post_location_filter", 99);
      }
 }

 function my_redirect_post_location_filter($location) {
      remove_filter('redirect_post_location', __FUNCTION__, 99);
      $location = add_query_arg('message', 99, $location);
      return $location;
 }

 add_filter('post_updated_messages', 'my_post_updated_messages_filter');
 function my_post_updated_messages_filter($messages) {
      $messages['post'][99] = 'Publish not allowed';
      return $messages;
 }
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1 comment

  1. I’d hooked to ‘wp_insert_post_empty_content’ filter. See https://core.trac.wordpress.org/browser/tags/3.8.1/src/wp-includes/post.php#L2748

    //hook at the very end of all filters to prevent other filters from overwriting your return value ( 99 should be high enaugh )
add_filter( 'wp_insert_post_empty_content', 'my_cancel_post_save_function', 99, 2 );

function my_cancel_post_save_function( $maybe_empty, $postarr ) {
    if ( true === wp_is_post_revision( $postarr[ 'ID' ] ) ) { //postarr is not an object, but array
       return $maybe_empty; //do not forget to return original value to keep other filters working
    }

    if( true === preg_match("/bad string/", $postarr[ 'post_content' ] ) ) {
        return true; // triggers the post saving cancelation in wp_insert_post function
    }

    return $maybe_empty; //do not forget to return original value to keep other filters working
}

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