BUGS-5816: Resolves issue where changing file content would not serve… (

#52)

* BUGS-5816: Resolves issue where changing file content would not serve new files.

Co-authored-by: Ryan Wagner <[email protected]>
Co-authored-by: Nicole Sciacca <https://git.drupalcode.org/nsciacca>

pantheon_advanced_page_cache.module

@@ -0,0 +1,49 @@
+<?php
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\image\Entity\ImageStyle;
+
+/**
+ * Implements hook_ENTITY_TYPE_update() for file entities.
+ *
+ * Clears edge cache by file url. If this is not done, changing file contents
+ * does not actually change the file that gets served until the cache times out.
+ */
+function pantheon_advanced_page_cache_file_update(EntityInterface $file) {
+  // Don't try this if we're not in a Pantheon environment.
+  if ( ! function_exists('pantheon_clear_edge_paths')) {
+    return;
+  }
+  // No matter what, the file's base URL needs to be cleared out.
+  $paths_to_clear = [$file->createFileUrl()];
+
+  // If this is an image, we need to clear the edge cache paths for every
+  // image style, or those won't work.
+  if (strpos($file->getMimeType(), 'image', 0) === 0) {
+    $styles = ImageStyle::loadMultiple();
+    foreach ($styles as $style) {
+      $file_uri = $file->getFileUri();
+      $url      = $style->buildUrl($file_uri);
+
+      $paths_to_clear[] = parse_url($url)['path'];
+    }
+  }
+
+  try {
+    pantheon_clear_edge_paths($paths_to_clear);
+  }
+  catch (Exception $e) {
+    \Drupal::logger('pantheon_advanced_page_cache')
+           ->warning('File upload @filename did not successfully clear edge caches. Caches may need to be cleared manually.',
+             ['@filename' => $file->getFileName()]);
+
+    \Drupal::logger('pantheon_advanced_page_cache')
+           ->error('@error', ['@error' => $e->getMessage()]);
+
+    return;
+  }
+
+  \Drupal::logger('pantheon_advanced_page_cache')
+         ->notice('File paths cleared in edge cache: @paths.',
+           ['@paths' => implode(', ', $paths_to_clear)]);
+}