<?php
/**
 * Created by PhpStorm.
 * User: wangsai
 * Date: 2019/9/5
 * Time: 16:55
 */

namespace App\Support;


trait UserAuth
{

    public static function random($length = 6, $type = 'string', $convert = 0)
    {
        $config = array(
            'number' => '1234567890',
            'letter' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
            'string' => 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789',
            'all' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'
        );

        if (!isset($config[$type]))
            $type = 'string';
        $string = $config[$type];

        $code = '';
        $strlen = strlen($string) - 1;
        for ($i = 0; $i < $length; $i++) {
            $code .= $string{mt_rand(0, $strlen)};
        }
        if (!empty($convert)) {
            $code = ($convert > 0) ? strtoupper($code) : strtolower($code);
        }
        return $code;
    }

    /**
     * 验证sign
     * @param $userId
     * @param $ttl
     * @param $random
     * @param $sign
     * @return bool
     */
    public static function validSign($userId,$ttl,$random,$sign){
        $params = array('user_id'=> $userId, 'ttl'=> $ttl, 'random'=> $random);
        $makesign = self::getSignature($params);
        if($makesign == $sign) {
            return true;
        }
        return false;
    }

    public static function getSignature($params)
    {
        // 按数组键名 正序排序
        ksort($params);
        $tem = array();
        foreach ($params as $k => $v) {
            if ($k !== 'sign') {
                $tem[] = "$k=$v";
            }
        }
        $sk = implode('&', $tem);
        return md5($sk);
    }
}