117 lines
5.2 KiB
C#
117 lines
5.2 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.Common.Utils;
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public static class HtmlUtil
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{
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private static readonly Regex _tagReplacer
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= new Regex("<[^>]*>", RegexOptions.Multiline | RegexOptions.Compiled);
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private static readonly Regex _commentsReplacer
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= new Regex("<!--(?s).*?-->", RegexOptions.Singleline | RegexOptions.IgnoreCase | RegexOptions.Compiled);
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private static readonly Regex _xssReplacer
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= new Regex(@"<\s*(style|script)[^>]*>(.*?)<\s*/\s*(style|script)>", RegexOptions.IgnoreCase
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| RegexOptions.CultureInvariant | RegexOptions.Compiled | RegexOptions.Singleline);
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private static readonly Regex _worder =
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new Regex(@"\S+", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
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public static string GetText(string html, int maxLength = 0, string endBlockTemplate = "...")
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{
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var unformatedText = string.Empty;
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if (!string.IsNullOrEmpty(html))
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{
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html = _xssReplacer.Replace(html, string.Empty); //Clean malicious tags. <script> <style>
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if (string.IsNullOrEmpty(html))
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{
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return html;
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}
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unformatedText = _tagReplacer.Replace(html, string.Empty);
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if (!string.IsNullOrEmpty(unformatedText))
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{
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// kill comments
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unformatedText = _commentsReplacer.Replace(unformatedText, string.Empty);
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unformatedText = unformatedText.Trim();
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if (!string.IsNullOrEmpty(unformatedText))
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{
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if (maxLength == 0 || unformatedText.Length < maxLength)
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{
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return HttpUtility.HtmlDecode(unformatedText);
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}
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//Set maximum length with end block
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maxLength = Math.Max(0, maxLength - endBlockTemplate.Length);
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var startIndex = Math.Max(0, Math.Min(unformatedText.Length - 1, maxLength));
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var countToScan = Math.Max(0, startIndex - 1);
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var lastSpaceIndex = unformatedText.LastIndexOf(' ', startIndex, countToScan);
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unformatedText = lastSpaceIndex > 0 && lastSpaceIndex < unformatedText.Length
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? unformatedText.Remove(lastSpaceIndex)
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: unformatedText.Substring(0, maxLength);
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if (!string.IsNullOrEmpty(endBlockTemplate))
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{
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unformatedText += endBlockTemplate;
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}
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}
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}
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}
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return HttpUtility.HtmlDecode(unformatedText);//TODO:!!!
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}
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public static string ToPlainText(string html)
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{
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return GetText(html);
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}
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/// <summary>
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/// The function highlight all words in htmlText by searchText.
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/// </summary>
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/// <param name="searchText">the space separated string</param>
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/// <param name="htmlText">html for highlight</param>
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/// <param name="withoutLink"></param>
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/// <returns>highlighted html</returns>
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public static string SearchTextHighlight(string searchText, string htmlText, bool withoutLink = false)
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{
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if (string.IsNullOrEmpty(searchText) || string.IsNullOrEmpty(htmlText))
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{
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return htmlText;
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}
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var regexpstr = _worder.Matches(searchText).Select(m => m.Value).Distinct().Aggregate((r, n) => r + "|" + n);
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var wordsFinder = new Regex(Regex.Escape(regexpstr), RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Multiline);
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return wordsFinder.Replace(htmlText, m => "<span class='searchTextHighlight" + (withoutLink ? " bold" : string.Empty) + "'>" + m.Value + "</span>");
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}
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} |