105 lines
2.4 KiB
PHP
105 lines
2.4 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.3
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*/
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namespace PrivateBin\Persistence;
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use Exception;
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/**
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* ServerSalt
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*
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* This is a random string which is unique to each PrivateBin installation.
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* It is automatically created if not present.
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*
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* Salt is used:
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* - to generate unique VizHash in discussions (which are not reproductible across PrivateBin servers)
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* - to generate unique deletion token (which are not re-usable across PrivateBin servers)
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*/
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class ServerSalt extends AbstractPersistence
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{
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/**
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* file where salt is saved to
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*
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* @access private
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* @static
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* @var string
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*/
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private static $_file = 'salt.php';
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/**
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* generated salt
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*
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* @access private
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* @static
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* @var string
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*/
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private static $_salt = '';
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/**
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* generate a large random hexadecimal salt
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*
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* @access public
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* @static
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* @return string
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*/
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public static function generate()
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{
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$randomSalt = bin2hex(random_bytes(256));
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return $randomSalt;
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}
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/**
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* get server salt
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*
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* @access public
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* @static
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* @throws Exception
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* @return string
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*/
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public static function get()
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{
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if (strlen(self::$_salt)) {
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return self::$_salt;
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}
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if (self::_exists(self::$_file)) {
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if (is_readable(self::getPath(self::$_file))) {
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$items = explode('|', file_get_contents(self::getPath(self::$_file)));
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}
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if (!isset($items) || !is_array($items) || count($items) != 3) {
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throw new Exception('unable to read file ' . self::getPath(self::$_file), 20);
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}
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self::$_salt = $items[1];
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} else {
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self::$_salt = self::generate();
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self::_store(
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self::$_file,
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'<?php # |' . self::$_salt . '|'
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);
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}
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return self::$_salt;
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}
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/**
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* set the path
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*
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* @access public
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* @static
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* @param string $path
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*/
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public static function setPath($path)
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{
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self::$_salt = '';
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parent::setPath($path);
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}
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}
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