--- /dev/null
+<?php
+
+/**
+ * @todo #2311679, this is a stop-gap workaround
+ * remove this once core has a solution in place.
+ */
+
+namespace Drupal\imagemagick;
+
+use Drupal\Core\File\MimeType\ExtensionMimeTypeGuesser;
+
+/**
+ * Makes possible to guess the MIME type of a file using its extension.
+ */
+class Todo2311679 extends ExtensionMimeTypeGuesser {
+
+ public function getExtensionsForMimeType($mimetype) {
+ if ($this->mapping === NULL) {
+ $mapping = $this->defaultMapping;
+ // Allow modules to alter the default mapping.
+ $this->moduleHandler->alter('file_mimetype_mapping', $mapping);
+ $this->mapping = $mapping;
+ }
+ if (!in_array($mimetype, $this->mapping['mimetypes'])) {
+ return [];
+ }
+ $key = array_search($mimetype, $this->mapping['mimetypes']);
+ $extensions = array_keys($this->mapping['extensions'], $key, TRUE);
+ sort($extensions);
+ return $extensions;
+ }
+
+ public function getMimeTypes() {
+ if ($this->mapping === NULL) {
+ $mapping = $this->defaultMapping;
+ // Allow modules to alter the default mapping.
+ $this->moduleHandler->alter('file_mimetype_mapping', $mapping);
+ $this->mapping = $mapping;
+ }
+ return array_values($this->mapping['mimetypes']);
+ }
+
+}