create filesystem abstraction

backend/app/Shared/Files/LaravelFilesystem.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace App\Shared\Files;
+
+use Illuminate\Support\Facades\Storage;
+use Illuminate\Support\Str;
+
+class LaravelFilesystem implements Filesystem
+{
+    public function upload(FileToUpload $file, string $folder): string
+    {
+        $path = $folder . '/' . Str::random(40) . $this->extensionFor($file);
+        Storage::disk('public')->put($path, $file->getContents());
+
+        return $path;
+    }
+
+    public function url(string $path): string
+    {
+        return Storage::disk('public')->url($path);
+    }
+
+    public function delete(string $path): void
+    {
+        Storage::disk('public')->delete($path);
+    }
+
+    public function read(string $path): ?string
+    {
+        if (!Storage::disk('public')->exists($path)) {
+            return null;
+        }
+
+        return Storage::disk('public')->get($path);
+    }
+
+    private function extensionFor(FileToUpload $file): string
+    {
+        $mimeExtensions = [
+            'image/jpeg' => '.jpg',
+            'image/png' => '.png',
+            'image/webp' => '.webp',
+            'application/pdf' => '.pdf',
+        ];
+        if (isset($mimeExtensions[$file->getMimeType()])) {
+            return $mimeExtensions[$file->getMimeType()];
+        }
+
+        $originalExtension = pathinfo(
+            $file->getOriginalName(),
+            PATHINFO_EXTENSION,
+        );
+        if ($originalExtension !== '') {
+            return '.' . $originalExtension;
+        }
+
+        return '';
+    }
+}