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/**
* MvcCore
*
* This source file is subject to the BSD 3 License
* For the full copyright and license information, please view
* the LICENSE.md file that are distributed with this source code.
*
* @copyright Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
* @license https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
*/
namespace MvcCore\Ext\Views\Helpers;
/**
* Responsibility - prevent sensitive content against spam bots and convert content into JS `<script>document.write(String.fromCharCode(...));`</script>.
* - All characters in given string has to be in `UTF-8` encoding.
* - Every character, text content or html tag, doesn't matter, is converted to `UTF-8`
* index and all indexes are placed into `<script>document.write(String.fromCharCode(...));</script>`
* to print original html or text content by javascript to be visible for Googlebot.
* @method \MvcCore\Ext\Views\Helpers\WriteByJsHelper GetInstance()
*/
class WriteByJsHelper {
/**
* MvcCore Extension - View Helper - Assets - version:
* Comparison by PHP function version_compare();
* @see http://php.net/manual/en/function.version-compare.php
*/
const VERSION = '5.0.0';
/**
* Any plaint text or any html content.
* @param string $string
* @return string
*/
public function WriteByJs ($string) {
$resultStringArr = [];
for ($i = 0, $l = strlen($string); $i < $l; $i++) {
$char = mb_substr($string, $i, 1, 'UTF-8');
if (mb_check_encoding($char, 'UTF-8')) {
$ret = mb_convert_encoding($char, 'UTF-32BE', 'UTF-8');
$resultStringArr[] = hexdec(bin2hex($ret));
}
}
$utf8Indexes = implode(',', $resultStringArr);
$utf8Indexes = trim($utf8Indexes, ',');
while (substr($utf8Indexes, strlen($utf8Indexes) - 2, 2) == ',0') {
$utf8Indexes = substr($utf8Indexes, 0, strlen($utf8Indexes) - 2);
}
return '<script>document.write(String.fromCharCode(' . $utf8Indexes . '));</script>';
}
}