blessing-skin-server/app/Providers/BootServiceProvider.php

<?php

namespace App\Providers;

use View;
use Illuminate\Support\ServiceProvider;
use App\Exceptions\PrettyPageException;

class BootServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        View::addExtension('tpl', 'blade');

        $this->checkFileExists();
        $this->checkDbConfig();
        $this->checkInstallation();
    }

    protected function checkFileExists()
    {
        if (!file_exists(BASE_DIR."/.env")) {
            throw new PrettyPageException('.env 文件不存在', -1);
        }
    }

    protected function checkDbConfig()
    {
        // use error control to hide shitty connect warnings
        @$conn = new \mysqli(
            config('database.connections.mysql.host'),
            config('database.connections.mysql.username'),
            config('database.connections.mysql.password'),
            config('database.connections.mysql.database'),
            config('database.connections.mysql.port')
        );

        if ($conn->connect_error)
            throw new PrettyPageException("无法连接至 MySQL 服务器，请检查你的配置：".$conn->connect_error, $conn->connect_errno);

        return true;
    }

    protected function checkInstallation()
    {
        if (!$this->checkTableExist()) {
            return redirect('/setup/index.php')->send();
        }

        if (!is_dir(BASE_DIR.'/storage/textures/')) {
            if (!mkdir(BASE_DIR.'/storage/textures/'))
                throw new PrettyPageException('textures 文件夹创建失败，请确认目录权限是否正确，或者手动放置一个。', -1);
        }

        if (config('app.version') != \Option::get('version', '')) {
            return redirect('/setup/update.php')->send();
        }

        return true;
    }

    public static function checkTableExist()
    {
        $tables = ['users', 'closets', 'players', 'textures', 'options'];

        foreach ($tables as $table_name) {
            // prefix will be added automatically
            if (!\Schema::hasTable($table_name)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}