[FEATURE] Add MIME type and file extension Helper methods (kitodo#1420)

Co-authored-by: Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>

Author: fschoelzel

Classes/Common/Helper.php

@@ -26,6 +26,7 @@
 use TYPO3\CMS\Core\Messaging\FlashMessageService;
 use TYPO3\CMS\Core\Messaging\FlashMessageQueue;
 use TYPO3\CMS\Core\Resource\MimeTypeCollection;
+use TYPO3\CMS\Core\Resource\MimeTypeDetector;
 use TYPO3\CMS\Core\Utility\ArrayUtility;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Core\Utility\MathUtility;
@@ -988,4 +989,28 @@ function ($mimeType) use ($categories) {
         }
         return false;
     }
+
+    /**
+     * Get file extensions for a given MIME type
+     *
+     * @param string $mimeType
+     * @return array
+     */
+    public static function getFileExtensionsForMimeType(string $mimeType): array
+    {
+        $mimeTypeDetector = GeneralUtility::makeInstance(MimeTypeDetector::class);
+        return $mimeTypeDetector->getFileExtensionsForMimeType($mimeType);
+    }
+
+    /**
+     * Get MIME types for a given file extension
+     *
+     * @param string $fileExtension
+     * @return array
+     */
+    public static function getMimeTypesForFileExtension(string $fileExtension): array
+    {
+        $mimeTypeDetector = GeneralUtility::makeInstance(MimeTypeDetector::class);
+        return $mimeTypeDetector->getMimeTypesForFileExtension($fileExtension);
+    }
 }

Classes/Controller/ToolboxController.php

@@ -139,19 +139,13 @@ private function renderToolByName(string $tool): void
      *
      * @return array Array of image information's.
      */
-    public function getImage(int $page): array
+    private function getImage(int $page): array
     {
         // Get @USE value of METS fileGroup.
         $image = $this->getFile($page, GeneralUtility::trimExplode(',', $this->settings['fileGrpsImageDownload']));
-        switch ($image['mimetype']) {
-            case 'image/jpeg':
-                $image['mimetypeLabel'] = ' (JPG)';
-                break;
-            case 'image/tiff':
-                $image['mimetypeLabel'] = ' (TIFF)';
-                break;
-            default:
-                $image['mimetypeLabel'] = '';
+        if (isset($image['mimetype'])) {
+            $fileExtension = Helper::getFileExtensionsForMimeType($image['mimetype']);
+            $image['mimetypeLabel'] = !empty($fileExtension) ? ' (' . strtoupper($fileExtension[0]) . ')' : '';
         }
         return $image;
     }