feat(media): use legacy filepath structure for attachments via custom path generator

app/Support/LegacyAttachmentPathGenerator.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Support;
+
+use Spatie\MediaLibrary\MediaCollections\Models\Media;
+use Spatie\MediaLibrary\Support\PathGenerator\PathGenerator;
+
+/**
+ * 附件路径生成器：优先用老 sablog 的原始 filepath（date_200802/xxx.jpg），
+ * 没有的话用 spatie 默认的 {id}/{file_name} 结构
+ */
+class LegacyAttachmentPathGenerator implements PathGenerator
+{
+    public function getPath(Media $media): string
+    {
+        $legacy = $media->getCustomProperty('legacy_filepath');
+        if ($legacy) {
+            $legacy = ltrim($legacy, '/');
+            $dir = dirname($legacy);
+            if ($dir !== '.') {
+                return $dir . '/';
+            }
+        }
+
+        return $media->id . '/';
+    }
+
+    public function getPathForConversions(Media $media): string
+    {
+        return $this->getPath($media) . 'conversions/';
+    }
+
+    public function getPathForResponsiveImages(Media $media): string
+    {
+        return $this->getPath($media) . 'responsive-images/';
+    }
+}

config/media-library.php

@@ -155,9 +155,7 @@ return [
      * Here you can specify which path generator should be used for the given class.
      */
     'custom_path_generators' => [
-        // Model::class => PathGenerator::class
-        // or
-        // 'model_morph_alias' => PathGenerator::class
+        \App\Models\Post::class => \App\Support\LegacyAttachmentPathGenerator::class,
     ],
 
     /*