Fix a bug where user_access/namespaces were not getting checked for datastreams.

islandora.module

@@ -1834,15 +1834,22 @@ 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) {
+  module_load_include('inc', 'islandora', 'includes/utilities');
+  $result = islandora_namespace_accessible($datastream->parent->id) && user_access($op, $user);
+
+  if ($result && $op == ISLANDORA_REGENERATE_DERIVATIVES) {
+    $applicable_hook = FALSE;
     $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 user_access(ISLANDORA_REGENERATE_DERIVATIVES);
+        $applicable_hook = TRUE;
+        break;
       }
     }
-    return FALSE;
+    if (!$applicable_hook) {
+      $result = FALSE;
+    }
   }
-  return NULL;
+  return $result;
 }