76 lines
2.7 KiB
JavaScript
76 lines
2.7 KiB
JavaScript
/*
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*
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* (c) Copyright Ascensio System Limited 2010-2020
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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/*
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* ShortURL (https://github.com/delight-im/ShortURL)
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* Copyright (c) delight.im (https://www.delight.im/)
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* Licensed under the MIT License (https://opensource.org/licenses/MIT)
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*/
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/**
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* ShortURL: Bijective conversion between natural numbers (IDs) and short strings
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*
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* ShortURL.encode() takes an ID and turns it into a short string
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* ShortURL.decode() takes a short string and turns it into an ID
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*
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* Features:
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* + large alphabet (51 chars) and thus very short resulting strings
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* + proof against offensive words (removed 'a', 'e', 'i', 'o' and 'u')
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* + unambiguous (removed 'I', 'l', '1', 'O' and '0')
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*
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* Example output:
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* 123456789 <=> pgK8p
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*/
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//'23456789bcdfghjkmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ-_'
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var _alphabet = "5XzpDt6wZRdsTrJkSY_cgPyxN4j-fnb9WKBF8vh3GH72QqmLVCM",
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_base = _alphabet.length,
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_initial = _base * _base;
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module.exports = {
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encode: function(num) {
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num += _initial;
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var str = '';
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while (num > 0) {
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str = _alphabet.charAt(num % _base) + str;
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num = Math.floor(num / _base);
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}
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return str;
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},
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decode: function(str) {
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var num = 0;
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for (var i = 0; i < str.length; i++) {
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let index = _alphabet.indexOf(str.charAt(i));
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if (index < 0) return null;
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num = num * _base + index;
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}
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return num - _initial;
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}
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}; |