<?php
/**
 * 通用curl
 * User: bleachin
 */
if (!defined('BASEPATH')) exit('No direct script access allowed');

class MyEncryption
{

    public function __construct()
    {
    }

    public function httpGet()
    {
        return 'httpGet';
    }

    public function keyED($txt, $encrypt_key)
    {
        $encrypt_key = md5($encrypt_key);
        $ctr = 0;
        $tmp = "";
        for ($i = 0; $i < strlen($txt); $i++) {
            if ($ctr == strlen($encrypt_key))
                $ctr = 0;
            $tmp .= substr($txt, $i, 1) ^ substr($encrypt_key, $ctr, 1);
            $ctr++;
        }
        return $tmp;
    }

    public function encrypt($txt, $key)
    {
        $encrypt_key = md5(mt_rand(0, 100));
        $ctr = 0;
        $tmp = "";
        for ($i = 0; $i < strlen($txt); $i++) {
            if ($ctr == strlen($encrypt_key))
                $ctr = 0;
            $tmp .= substr($encrypt_key, $ctr, 1) . (substr($txt, $i, 1) ^ substr($encrypt_key, $ctr, 1));
            $ctr++;
        }
        return $this->keyED($tmp, $key);
    }

    public function decrypt($txt, $key)
    {
        $txt = $this->keyED($txt, $key);
        $tmp = "";
        for ($i = 0; $i < strlen($txt); $i++) {
            $md5 = substr($txt, $i, 1);
            $i++;
            $tmp .= (substr($txt, $i, 1) ^ $md5);
        }
        return $tmp;
    }

    /**
     * Notes:url加key加密
     * Created on: 2020/10/18 17:01
     * Created by: dengbw
     * @param $url
     * @param $key
     * @return string
     */
    public function encrypt_url($url, $key)
    {
        return rawurlencode(base64_encode($this->encrypt($url, $key)));
    }

    /**
     * Notes:url加key解密
     * Created on: 2020/10/18 17:02
     * Created by: dengbw
     * @param $url
     * @param $key
     * @return string
     */
    public function decrypt_url($url, $key)
    {
        return $this->decrypt(base64_decode(rawurldecode($url)), $key);
    }

    /**
     * Notes:url加key解密数组
     * Created on: 2020/10/18 17:02
     * Created by: dengbw
     * @param $url
     * @param $key
     * @return string
     */
    public function get_url($str, $key)
    {
        $str = $this->decrypt_url($str, $key);
        $url_array = explode('&', $str);
        if (is_array($url_array)) {
            foreach ($url_array as $var) {
                $var_array = explode("=", $var);
                $vars [$var_array [0]] = $var_array [1];
            }
        }
        return $vars;
    }

    /**
     * Notes:url加密
     * Created on: 2020/10/18 17:00
     * Created by: dengbw
     * @param $data
     * @return string
     */
    public function base64url_encode($data)
    {
        return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
    }

    /**
     * Notes:url解密
     * Created on: 2020/10/18 17:01
     * Created by: dengbw
     * @param $data
     * @return array
     */
    public function base64url_decode($data)
    {
        $str = base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));
        $url_array = explode('&', $str);
        $vars = array();
        if (is_array($url_array)) {
            foreach ($url_array as $var) {
                $var_array = explode("=", $var);
                $vars[$var_array[0]] = $var_array[1];
            }
        }
        return $vars;
    }

    /**
     * Notes:随机生成数字字母组合
     * Created on: 2020/11/4 12:40
     * Created by: dengbw
     * @param $len
     * @param null $chars
     * @return string
     */
    public function random_string($len, $chars = null)
    {
        if (is_null($chars)) {
            $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        }
        mt_srand(10000000 * (double)microtime());
        for ($i = 0, $str = '', $lc = strlen($chars) - 1; $i < $len; $i++) {
            $str .= $chars[mt_rand(0, $lc)];
        }
        return $str;
    }
}