Resolves #2.

README.md

@@ -2,9 +2,9 @@
 
 ## Introduction
 
-A Drupal 8/9 module that serializes PREMIS metadata generated by various Islandora modules and microsrevices. This module produces PREMIS v3 in Turtle RDF for a node by appending `/premis` to the end of the node's URL, e.g., `https://localhost/node/250/premis`.
+A Drupal 8/9 module that serializes PREMIS metadata generated by various Islandora modules and microsrevices, including Islandora, JSON-LD, and Riprap. This module produces PREMIS v3 in Turtle RDF for a node by appending `/premis` to the end of the node's URL, e.g., `https://localhost/node/250/premis`.
 
-This module is not ready for prodcution use. But could be soon with your feedback and testing!
+Feedback on what PREMIS entities and events you'd like to see in this output is welcome.
 
 Output will look like this:
 
@@ -72,6 +72,8 @@ Note that the fixity events are added by the [Islandora Riprap](https://github.c
 
 * [Islandora 8](https://github.com/Islandora/islandora)
 
+If [Islandora Riprap](https://github.com/mjordan/islandora_riprap) is installed, fixity check events will be added to the PREMIS output.
+
 ## Installation
 
 1. Clone this repo into your Islandora's `drupal/web/modules/contrib` directory.

islandora_premis.module

@@ -37,11 +37,19 @@ function islandora_premis_islandora_premis_turtle_alter($nid, &$turtle) {
   if (count($media) > 0) {
     foreach ($media as $medium) {
       $file = $media_source->getSourceFile($medium);
-      $binary_resource_url = $file_uri_lookup->getUrl($medium->id());
-      if (is_null($binary_resource_url)) {
+      $file_url = $file_uri_lookup->getUrl($medium->id());
+      if (is_null($file_url)) {
         return;
       }
 
+      $binary_resource_url = $file_url;
+      if (\Drupal::moduleHandler()->moduleExists('islandora_riprap')) {
+        $riprap_config = \Drupal::config('islandora_riprap.settings');
+        if ($riprap_config->get('use_drupal_urls')) {
+          $binary_resource_url = $islandora_riprap_utils->getLocalUrl($medium->id());
+        }
+      }
+
       // Register some namespaces.
       $ns = new RdfNamespace();
       $ns->set('premisObject', 'http://www.loc.gov/premis/rdf/v3/Object');