Added check for iiv viewer.

ilives/fedora_ilives.module

@@ -593,5 +593,52 @@ function install_book_content_model_objects() {
   if (!Fedora_Item::fedora_item_exists('ilives:CollectionModel')) {
     Fedora_Item::ingest_from_foxml_file(drupal_get_path('module', 'fedora_ilives') . '/xml/ilives_CollectionModel.xml');
   }
+}
+
+/**
+ * Implementation of hook_requirements().
+ *
+ * @return
+ *   An array describing the status of the site regarding available updates.
+ *   If there is no update data, only one record will be returned, indicating
+ *   that the status of core can't be determined. If data is available, there
+ *   will be two records: one for core, and another for all of contrib
+ *   (assuming there are any contributed modules or themes enabled on the
+ *   site). In addition to the fields expected by hook_requirements ('value',
+ *   'severity', and optionally 'description'), this array will contain a
+ *   'reason' attribute, which is an integer constant to indicate why the
+ *   given status is being returned (UPDATE_NOT_SECURE, UPDATE_NOT_CURRENT, or
+ *   UPDATE_UNKNOWN). This is used for generating the appropriate e-mail
+ *   notification messages during update_cron(), and might be useful for other
+ *   modules that invoke update_requirements() to find out if the site is up
+ *   to date or not.
+ *
+ * @see _update_message_text()
+ * @see _update_cron_notify()
+ */
+function fedora_ilives_requirements($phase) {
+  global $base_url;
+  if ($phase == 'runtime') {
+    module_load_include('inc', 'fedora_repository', 'api/fedora_utils');
+    $requirements['iiv-war'] = array();
+    $requirements['iiv-war']['title'] = t("Islandora OpenLayers image viewer web app");
+    if (!_fedora_ilives_viewer_available()) {
+      $requirements['iiv-war']['value'] = ("Not available");
+      $requirements['iiv-war']['severity'] = REQUIREMENT_ERROR;
+      $requirements['iiv-war']['description'] = t('Ensure that Fedora is running and that the <a href="@iiv-home">IIV</a> app is deployed.', 
+              array('@iiv-home' => 'http://github.com/islandora/iiv'));
+    }
+    else {
+      $requirements['iiv-war']['value'] = ("Available");
+      $requirements['iiv-war']['severity'] = REQUIREMENT_OK;
+    }
+  }
+  return $requirements;
+}
 
+function _fedora_ilives_viewer_available() {
+  $url = parse_url(variable_get('fedora_base_url', 'http://localhost:8080/fedora'));
+  $fedora_host = ("{$url['scheme']}://{$url['host']}" . (!empty($url['port']) ? ":{$url['port']}/" : '/'));
+  $response = drupal_http_request("$fedora_host/iiv/images/loading.gif");
+  return empty($response->error);
 }