重新实现filesystem模块，升级到最新版本；

extend/think/filesystem/driver/Local.php

@@ -0,0 +1,98 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006~2021 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: yunwuxin <448901948@qq.com>
+// +----------------------------------------------------------------------
+declare (strict_types = 1);
+
+namespace think\filesystem\driver;
+
+use League\Flysystem\FilesystemAdapter;
+use League\Flysystem\Local\LocalFilesystemAdapter;
+use League\Flysystem\PathNormalizer;
+use League\Flysystem\PathPrefixer;
+use League\Flysystem\UnixVisibility\PortableVisibilityConverter;
+use League\Flysystem\Visibility;
+use League\Flysystem\WhitespacePathNormalizer;
+use think\filesystem\Driver;
+
+class Local extends Driver
+{
+    /**
+     * 配置参数
+     * @var array
+     */
+    protected $config = [
+        'root' => '',
+    ];
+
+    /**
+     * @var PathPrefixer
+     */
+    protected $prefixer;
+
+    /**
+     * @var PathNormalizer
+     */
+    protected $normalizer;
+
+    protected function createAdapter(): FilesystemAdapter
+    {
+        $visibility = PortableVisibilityConverter::fromArray(
+            $this->config['permissions'] ?? [],
+            $this->config['visibility'] ?? Visibility::PRIVATE
+        );
+
+        $links = ($this->config['links'] ?? null) === 'skip'
+            ? LocalFilesystemAdapter::SKIP_LINKS
+            : LocalFilesystemAdapter::DISALLOW_LINKS;
+
+        return new LocalFilesystemAdapter(
+            $this->config['root'],
+            $visibility,
+            $this->config['lock'] ?? LOCK_EX,
+            $links
+        );
+    }
+
+    protected function prefixer()
+    {
+        if (!$this->prefixer) {
+            $this->prefixer = new PathPrefixer($this->config['root'], DIRECTORY_SEPARATOR);
+        }
+        return $this->prefixer;
+    }
+
+    protected function normalizer()
+    {
+        if (!$this->normalizer) {
+            $this->normalizer = new WhitespacePathNormalizer();
+        }
+        return $this->normalizer;
+    }
+
+    /**
+     * 获取文件访问地址
+     * @param string $path 文件路径
+     * @return string
+     */
+    public function url(string $path): string
+    {
+        $path = $this->normalizer()->normalizePath($path);
+
+        if (isset($this->config['url'])) {
+            return $this->concatPathToUrl($this->config['url'], $path);
+        }
+        return parent::url($path);
+    }
+
+    public function path(string $path): string
+    {
+        return $this->prefixer()->prefixPath($path);
+    }
+}