Make the rendering of the regenerate link respect things.

islandora.module

@@ -1829,3 +1829,20 @@ function islandora_islandora_metadata_display_info() {
     ),
   );
 }
+
+/**
+ * Implements hook_islandora_datastream_access().
+ */
+function islandora_islandora_datastream_access($op, AbstractDatastream $datastream, $user) {
+  if ($op == ISLANDORA_REGENERATE_DERIVATIVES) {
+    $object = $datastream->parent;
+    $hooks = islandora_invoke_hook_list(ISLANDORA_DERVIATIVE_CREATION_HOOK, $object->models, array($object));
+    foreach ($hooks as $hook) {
+      if ($hook['destination_dsid'] == $datastream->id && ((isset($hook['source_dsid']) && isset($object[$hook['source_dsid']]) && islandora_datastream_access(ISLANDORA_VIEW_OBJECTS, $object[$hook['source_dsid']], $user)) || (array_key_exists('source_dsid', $hook) && $hook['source_dsid'] == NULL))) {
+        return TRUE;
+      }
+    }
+    return FALSE;
+  }
+  return NULL;
+}

theme/theme.inc

@@ -53,14 +53,12 @@ function islandora_preprocess_islandora_default_edit(array &$variables) {
       'class' => 'datastream-size',
       'data' => islandora_datastream_get_human_readable_size($ds),
     );
-    if (islandora_datastream_access(ISLANDORA_VIEW_DATASTREAM_HISTORY, $ds)) {
-      $row[] = array(
-        'class' => 'datastream-versions',
-        'data' => theme('islandora_datastream_version_link', array(
-          'datastream' => $ds,
-        )),
-      );
-    }
+    $row[] = array(
+      'class' => 'datastream-versions',
+      'data' => theme('islandora_datastream_version_link', array(
+        'datastream' => $ds,
+      )),
+    );
     $row[] = array(
       'class' => 'datastream-download',
       'data' => theme('islandora_datastream_download_link', array(
@@ -79,14 +77,12 @@ function islandora_preprocess_islandora_default_edit(array &$variables) {
         'datastream' => $ds,
       )),
     );
-    if (islandora_datastream_access(ISLANDORA_REGENERATE_DERIVATIVES, $ds)) {
-      $row[] = array(
-        'class' => 'datastream-regenerate',
-        'data' => theme('islandora_datastream_regenerate_link', array(
-          'datastream' => $ds,
-        )),
-      );
-    }
+    $row[] = array(
+      'class' => 'datastream-regenerate',
+      'data' => theme('islandora_datastream_regenerate_link', array(
+        'datastream' => $ds,
+      )),
+    );
     $rows[] = $row;
   }
   $caption = filter_xss($islandora_object->label) . ' - ' . $islandora_object->id;
@@ -444,12 +440,8 @@ function theme_islandora_datastream_version_link(array $vars) {
  */
 function theme_islandora_datastream_regenerate_link(array $vars) {
   $datastream = $vars['datastream'];
-  $object = $datastream->parent;
-  $hooks = islandora_invoke_hook_list(ISLANDORA_DERVIATIVE_CREATION_HOOK, $object->models, array($object));
-  foreach ($hooks as $hook) {
-    if (isset($hook['source_dsid']) && isset($object[$hook['source_dsid']]) && $hook['destination_dsid'] == $datastream->id) {
-      return l(t('regenerate'), "islandora/object/{$datastream->parent->id}/datastream/{$datastream->id}/regenerate");
-    }
+  if (islandora_datastream_access(ISLANDORA_REGENERATE_DERIVATIVES, $datastream)) {
+    return l(t('regenerate'), "islandora/object/{$datastream->parent->id}/datastream/{$datastream->id}/regenerate");
   }
 }