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当前路径：vendor/topthink/framework/src/think/response/File.php
<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\response;

use think\Exception;
use think\Response;

/**
 * File Response
 */
class File extends Response
{
    protected $expire = 360;
    protected $name;
    protected $mimeType;
    protected $isContent = false;
    protected $force     = true;

    public function __construct($data = '', int $code = 200)
    {
        $this->init($data, $code);
    }

    /**
     * 澶勭悊鏁版嵁
     * @access protected
     * @param  mixed $data 瑕佸鐞嗙殑鏁版嵁
     * @return mixed
     * @throws \Exception
     */
    protected function output($data)
    {
        if (!$this->isContent && !is_file($data)) {
            throw new Exception('file not exists:' . $data);
        }

        ob_end_clean();

        if (!empty($this->name)) {
            $name = $this->name;
        } else {
            $name = !$this->isContent ? pathinfo($data, PATHINFO_BASENAME) : '';
        }

        if ($this->isContent) {
            $mimeType = $this->mimeType;
            $size     = strlen($data);
        } else {
            $mimeType = $this->getMimeType($data);
            $size     = filesize($data);
        }

        $this->header['Pragma']                    = 'public';
        $this->header['Content-Type']              = $mimeType ?: 'application/octet-stream';
        $this->header['Cache-control']             = 'max-age=' . $this->expire;
        $this->header['Content-Disposition']       = ($this->force ? 'attachment; ' : '') . 'filename="' . $name . '"';
        $this->header['Content-Length']            = $size;
        $this->header['Content-Transfer-Encoding'] = 'binary';
        $this->header['Expires']                   = gmdate("D, d M Y H:i:s", time() + $this->expire) . ' GMT';

        $this->lastModified(gmdate('D, d M Y H:i:s', time()) . ' GMT');

        return $this->isContent ? $data : file_get_contents($data);
    }

    /**
     * 璁剧疆鏄惁涓哄唴瀹?蹇呴』閰嶅悎mimeType鏂规硶浣跨敤
     * @access public
     * @param  bool $content
     * @return $this
     */
    public function isContent(bool $content = true)
    {
        $this->isContent = $content;
        return $this;
    }

    /**
     * 璁剧疆鏈夋晥鏈?     * @access public
     * @param  integer $expire 鏈夋晥鏈?     * @return $this
     */
    public function expire(int $expire)
    {
        $this->expire = $expire;
        return $this;
    }

    /**
     * 璁剧疆鏂囦欢绫诲瀷
     * @access public
     * @param  string $filename 鏂囦欢鍚?     * @return $this
     */
    public function mimeType(string $mimeType)
    {
        $this->mimeType = $mimeType;
        return $this;
    }

    /**
     * 璁剧疆鏂囦欢寮哄埗涓嬭浇
     * @access public
     * @param  bool $force 寮哄埗娴忚鍣ㄤ笅杞?     * @return $this
     */
    public function force(bool $force)
    {
        $this->force = $force;
        return $this;
    }

    /**
     * 鑾峰彇鏂囦欢绫诲瀷淇℃伅
     * @access public
     * @param  string $filename 鏂囦欢鍚?     * @return string
     */
    protected function getMimeType(string $filename): string
    {
        if (!empty($this->mimeType)) {
            return $this->mimeType;
        }

        $finfo = finfo_open(FILEINFO_MIME_TYPE);

        return finfo_file($finfo, $filename);
    }

    /**
     * 璁剧疆涓嬭浇鏂囦欢鐨勬樉绀哄悕绉?     * @access public
     * @param  string $filename 鏂囦欢鍚?     * @param  bool   $extension 鍚庣紑鑷姩璇嗗埆
     * @return $this
     */
    public function name(string $filename, bool $extension = true)
    {
        $this->name = $filename;

        if ($extension && false === strpos($filename, '.')) {
            $this->name .= '.' . pathinfo($this->data, PATHINFO_EXTENSION);
        }

        return $this;
    }
}

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