<?php
// +----------------------------------------------------------------------
// | 萤火商城系统 [ 致力于通过产品和服务，帮助商家高效化开拓市场 ]
// +----------------------------------------------------------------------
// | Copyright (c) 2017~2021 https://www.yiovo.com All rights reserved.
// +----------------------------------------------------------------------
// | Licensed 这不是一个自由软件，不允许对程序代码以任何形式任何目的的再发行
// +----------------------------------------------------------------------
// | Author: 萤火科技 <admin@yiovo.com>
// +----------------------------------------------------------------------
declare (strict_types=1);

// 应用公共函数库文件

/**
 * 获取当前访问的渠道(微信小程序、H5、APP等)
 * @return string|null
 */
function getPlatform()
{
    static $value = 'H5';
    // 从header中获取 channel
    empty($value) && $value = request()->header('platform');
    // 调试模式下可通过param中获取
    if (is_debug() && empty($value)) {
        $value = request()->param('platform');
    }
    return $value;
}

// 加密函数
function encrypt0(string $data, $key = 'vp-256-bit-secret-key')
{
    $method = 'AES-256-CBC';
    //$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($method));
    $iv = random_bytes(openssl_cipher_iv_length($method));
    //$iv =  mb_convert_encoding($iv,'utf8');
    $encrypted = openssl_encrypt($data, $method, $key, 0, $iv);
    // 将iv和加密数据拼接在一起，然后进行base64编码
    return base64_encode($iv . $encrypted);
}

function encrypt(string $data)
{
    $timestamp = time();
    $pre0 = str_repeat('0', 10 - strlen($data));
    return strrev(strval($timestamp)) . $pre0 . $data;
}

// 解密函数
function decrypt0($data, $key = 'vp-256-bit-secret-key')
{
    $method = 'AES-256-CBC';
    // 解码加密字符串，并分离iv
    $decoded = base64_decode($data);
    $iv = substr($decoded, 0, openssl_cipher_iv_length($method));
    $decrypted = openssl_decrypt(substr($decoded, openssl_cipher_iv_length($method)), $method, $key, 0, $iv);
    return $decrypted;
}

function decrypt($data)
{
    if (empty($data) || strlen($data) < 10){
        return 0;
    }
    return intval(substr($data, 10));
}