<?php

namespace app\admin\controller;

use app\admin\BaseController;
use think\facade\Request;
use think\Response;

class StorageController extends BaseController
{
    /**
     * 获取存储文件
     * 用于访问 /storage/ 路径下的静态文件
     * @param string $path 文件路径
     */
    public function index($path = '')
    {
        // 如果没有传递路径参数，从pathinfo获取
        if (empty($path)) {
            $pathinfo = Request::pathinfo();
            $path = str_replace('storage/', '', $pathinfo);
        }
        
        // 防止路径遍历攻击
        $path = str_replace('..', '', $path);
        $path = ltrim($path, '/');
        
        // 构建文件完整路径
        $filePath = public_path() . 'storage/' . $path;
        
        // 检查文件是否存在
        if (!file_exists($filePath) || !is_file($filePath)) {
            return json([
                'code' => 404,
                'msg' => '文件不存在'
            ]);
        }
        
        // 获取文件MIME类型
        $mimeType = mime_content_type($filePath);
        if (!$mimeType) {
            // 根据文件扩展名判断MIME类型
            $ext = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
            $mimeTypes = [
                'jpg' => 'image/jpeg',
                'jpeg' => 'image/jpeg',
                'png' => 'image/png',
                'gif' => 'image/gif',
                'webp' => 'image/webp',
                'mp4' => 'video/mp4',
                'mp3' => 'audio/mpeg',
                'pdf' => 'application/pdf',
            ];
            $mimeType = $mimeTypes[$ext] ?? 'application/octet-stream';
        }
        
        // 读取文件内容
        $content = file_get_contents($filePath);
        
        // 返回文件响应
        return Response::create($content, 'file', 200)
            ->header([
                'Content-Type' => $mimeType,
                'Content-Length' => filesize($filePath),
                'Cache-Control' => 'public, max-age=31536000',
            ]);
    }
}