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<?php // phpcs:ignore
/**
* String helper class
*/
class Snapshot_Helper_String {
/**
* Converts name to something not as easily guessable
*
* @param string $string Base name to use
*
* @return string
*/
public static function conceal ($string) {
if (empty($string)) return false;
$base = pathinfo($string, PATHINFO_FILENAME);
$ext = pathinfo($string, PATHINFO_EXTENSION);
$out = self::conceal_string($base);
if (!empty($ext)) $out .= '.' . $ext;
return $out;
}
/**
* General string concealment method
*
* @param string $string String to conceal
*
* @return string Concealed string
*/
public static function conceal_string ($string) {
if (empty($string)) return '';
return bin2hex(self::_apply_codec($string));
}
/**
* Converts encoded name back to base.
*
* Reverse of `conceal`
*
* @param string $string Name to revert
*
* @return string
*/
public static function reveal ($string) {
if (empty($string)) return false;
$name = pathinfo($string, PATHINFO_FILENAME);
$ext = pathinfo($string, PATHINFO_EXTENSION);
$out = self::reveal_string($name);
if (!empty($ext)) $out .= '.' . $ext;
return $out;
}
/**
* General string revealing method
*
* @param string $string String to reveal
*
* @return string Revealed string
*/
public static function reveal_string ($string) {
if (empty($string)) return '';
return self::_apply_codec(hex2bin($string));
}
/**
* Key generation helper
*
* @return string
*/
private static function _get_key () {
$key = '';
if (defined('NONCE_KEY')) $key .= NONCE_KEY;
$key .= SNAPSHOT_I18N_DOMAIN;
if (defined('NONCE_SALT')) $key .= NONCE_SALT;
return sha1($key);
}
/**
* Apply codec to a string
*
* @param string $string Target string
*
* @return string
*/
private static function _apply_codec ($string) {
if (empty($string)) return $string;
$key = self::_get_key();
if (empty($key)) return $string;
$out = '';
$string_length = strlen($string);
for ($i=0; $i<$string_length; $i++) {
$out .= $string[$i] ^ $key;
}
return $out;
}
}
if ( !function_exists( 'hex2bin' ) ) {
/**
* Fallback implementation for old setups
*
* @param string $str Hexadecimal representation of data
*
* @return mixed Binary representation of the given data, or (bool)false on failure
*/
function hex2bin( $str ) {
$sbin = "";
$len = strlen( $str );
for ( $i = 0; $i < $len; $i += 2 ) {
$sbin .= pack( "H*", substr( $str, $i, 2 ) );
}
return $sbin;
}
}