Issue #964: Allow relative paths in IIIF manifests.

modules/islandora_iiif/config/schema/islandora_iiif.schema.yml

@@ -5,6 +5,9 @@ islandora_iiif.settings:
     iiif_server:
       type: string
       label: 'IIIF Server Url'
+    use_relative_paths:
+    type: boolean
+    label: 'Use relative paths in manifest.'
 
 views.style.iiif_manifest:
   type: views_style

modules/islandora_iiif/src/Form/IslandoraIIIFConfigForm.php

@@ -73,6 +73,14 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#description' => $this->t('Please enter the image server location without trailing slash. e.g. http://www.example.org/iiif/2.'),
       '#default_value' => $config->get('iiif_server'),
     ];
+
+    $form['use_relative_paths'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t("Use relative file paths in manifest."),
+      '#description' => $this->t("Check this if your IIIF Server is configured to access files locally. If unchecked, the absolute URL will be given and the IIIF server will make requests to this site to retrieve images."),
+      '#default_value' => $config->get('use_relative_paths'),
+    ];
+
     return parent::buildForm($form, $form_state);
   }
 
@@ -99,6 +107,7 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
 
     $this->config('islandora_iiif.settings')
       ->set('iiif_server', $form_state->getValue('iiif_server'))
+      ->set('use_relative_paths', $form_state->getValue('use_relative_paths'))
       ->save();
   }
 

modules/islandora_iiif/src/Plugin/views/style/IIIFManifest.php

@@ -5,6 +5,7 @@
 use Drupal\Core\Config\ImmutableConfig;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\File\FileSystemInterface;
 use Drupal\Core\Field\FieldItemInterface;
 use Drupal\Core\Form\FormStateInterface;
@@ -228,7 +229,13 @@ protected function getTileSourceFromRow(ResultRow $row, $iiif_address, $iiif_bas
 
           // Create the IIIF URL for this file
           // Visiting $iiif_url will resolve to the info.json for the image.
-          $file_url = $image->entity->createFileUrl(FALSE);
+          if ($this->iiifConfig->get('use_relative_paths')) {
+            $file_url = ltrim($image->entity->createFileUrl(TRUE), '/');
+          }
+          else {
+            $file_url = $image->entity->createFileUrl(FALSE);
+          }
+
           $mime_type = $image->entity->getMimeType();
           $iiif_url = rtrim($iiif_address, '/') . '/' . urlencode($file_url);