<?php
/**
 * Author: cfn <cfn@leapy.cn>
 */

namespace App\Kernel;

use Hyperf\HttpServer\Contract\RequestInterface;
use function Hyperf\Config\config;

class Str
{
    /**
     * 获取UUID
     * @param string $prefix
     * @return string
     */
    static function uuid(string $prefix = ''): string
    {
        $chars = md5(uniqid(mt_rand(), true));
        $uuid = substr($chars, 0, 8) . '-';
        $uuid .= substr($chars, 8, 4) . '-';
        $uuid .= substr($chars, 12, 4) . '-';
        $uuid .= substr($chars, 16, 4) . '-';
        $uuid .= substr($chars, 20, 12);
        return $prefix . $uuid;
    }

    /**
     * 公钥加密
     * Author: cfn <cfn@leapy.cn>
     * @param $data
     * @return string
     */
    public static function public_encrypt($data)
    {
        $pubKey = "-----BEGIN PUBLIC KEY-----\n" .
            wordwrap(config("app.public"), 64, "\n", true) .
            "\n-----END PUBLIC KEY-----";
        openssl_public_encrypt($data, $encrypted, $pubKey);
        return base64_encode($encrypted);
    }

    /**
     * 私钥解密
     * Author: cfn <cfn@leapy.cn>
     * @param $data
     * @return string
     */
    public static function private_decrypt($data)
    {
        $priKey = "-----BEGIN PRIVATE KEY-----\n" .
            wordwrap(config("app.private"), 64, "\n", true) .
            "\n-----END PRIVATE KEY-----";
        openssl_private_decrypt(base64_decode($data), $decrypted, $priKey);
        return $decrypted;
    }

    /**
     * 加密
     * Author: cfn <cfn@leapy.cn>
     * @param $data
     * @return string
     */
    public static function encrypt($data)
    {
        return base64_encode(openssl_encrypt($data,"DES-ECB",config("app.key")));
    }

    /**
     * 解密
     * Author: cfn <cfn@leapy.cn>
     * @param $data
     * @return false|string
     */
    public static function decrypt($data)
    {
        return openssl_decrypt(base64_decode($data),"DES-ECB",config("app.key"));
    }

    /**
     * 获取随机字符串
     * @param int $num
     * @param string $prefix
     * @return string
     */
    static function randStr(int $num, string $prefix = ""): string
    {
        $str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
        $_str = "";
        while ($num > 0) {
            $_str .= substr($str, rand(0, strlen($str) - 1), 1);
            $num--;
        }
        return $prefix . $_str;
    }

    /**
     * @param int $num
     * @param string $prefix
     * @return string
     */
    static function randInt(int $num, string $prefix = ""): string
    {
        $str = "1234567890";
        $_str = "";
        while ($num > 0) {
            $_str .= substr($str, rand(0, strlen($str) - 1), 1);
            $num--;
        }
        return $prefix . $_str;
    }

    /**
     * 返回ip
     * @param RequestInterface $request
     * @return string
     */
    static function ip(RequestInterface $request): string
    {
        $res = $request->getHeaders();
        if (isset($res['http_client_ip'])) {
            return $res['http_client_ip'][0];
        } elseif (isset($res['x-real-ip'])) {
            return $res['x-real-ip'][0];
        } elseif (isset($res['x-forwarded-for'])) {
            return $res['x-forwarded-for'][0];
        } else {
            $serverParams = $request->getServerParams();
            return $serverParams['remote_addr'][0];
        }
    }
}