<?php
declare (strict_types = 1);

namespace app\middleware;

/**
 * 登录验证中间件
 */
class Auth
{
    /**
     * 处理请求
     *
     * @param \think\Request $request
     * @param \Closure       $next
     * @return mixed
     */
    public function handle($request, \Closure $next)
    {
        // 检查是否已登录
        $username = session('username');
        
        if (empty($username)) {
            // 如果是AJAX请求，返回JSON
            if ($request->isAjax()) {
                return json([
                    'code' => 0,
                    'msg' => '请先登录',
                ]);
            }
            // 否则跳转到登录页
            return redirect('/login');
        }
        
        return $next($request);
    }
}