From a7a663fc2f98b56f6d99d22f65aca2ec6e1529e3 Mon Sep 17 00:00:00 2001
From: Stefan Bohacek <stefan@fourtonfish.com>
Date: Thu, 10 May 2018 21:06:28 -0400
Subject: [PATCH] For external resources, redirect post page to external URL.

---
 includes/post-types/resources.php | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/includes/post-types/resources.php b/includes/post-types/resources.php
index f1b77f8..81fc6fa 100644
--- a/includes/post-types/resources.php
+++ b/includes/post-types/resources.php
@@ -8,6 +8,8 @@ function post_type_setup() {
     add_action( 'save_post',  array( $this, 'save_meta' ), 10, 2 );
     add_filter( 'enter_title_here', array( $this, 'change_post_title_placeholder' ) );
     add_filter( 'post_type_link', array( $this, 'resource_page_link' ), 1, 3 );
+    add_filter( 'template_redirect', array( $this, 'external_resource_redirect' ) );
+
   }
 
   function create_post_type() {
@@ -15,6 +17,16 @@ function create_post_type() {
     add_action( 'init', array( $this, 'register_resource_type_taxonomy' ), 40 );
   }
 
+  function external_resource_redirect() {
+    global $wp_query;
+    if ($wp_query->query['post_type'] === 'resource'){
+      $external_resource_url = get_post_meta( $wp_query->posts[0]->ID, 'resource_url', true );
+      if ( !empty( $external_resource_url ) ){
+        wp_redirect( $external_resource_url );
+      }
+    }
+  }
+
   function resource_page_link( $post_link, $post ){
     $post = get_post($post->ID);
     $post_type = get_post_type( $post->ID );