169 lines
5.8 KiB
C#
169 lines
5.8 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
|
|
//
|
|
// This program is a free software product.
|
|
// You can redistribute it and/or modify it under the terms
|
|
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
|
|
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
|
|
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
|
|
// any third-party rights.
|
|
//
|
|
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
|
|
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
|
|
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
|
|
//
|
|
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
|
|
//
|
|
// The interactive user interfaces in modified source and object code versions of the Program must
|
|
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
|
|
//
|
|
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
|
|
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
|
|
// trademark law for use of our trademarks.
|
|
//
|
|
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
|
|
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
|
|
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
|
|
|
|
namespace ASC.Web.Core.Utility;
|
|
|
|
[Scope(Additional = typeof(UrlShortenerExtension))]
|
|
public interface IUrlShortener
|
|
{
|
|
Task<string> GetShortenLinkAsync(string shareLink);
|
|
}
|
|
|
|
[Scope]
|
|
public class BaseUrlShortener: IUrlShortener
|
|
{
|
|
private readonly ConsumerFactory _consumerFactory;
|
|
private readonly IServiceProvider _serviceProvider;
|
|
|
|
public BaseUrlShortener(
|
|
ConsumerFactory consumerFactory,
|
|
IServiceProvider serviceProvider)
|
|
{
|
|
_consumerFactory = consumerFactory;
|
|
_serviceProvider = serviceProvider;
|
|
}
|
|
|
|
public Task<string> GetShortenLinkAsync(string shareLink)
|
|
{
|
|
IUrlShortener shortener;
|
|
if (_consumerFactory.Get<BitlyLoginProvider>().Enabled)
|
|
{
|
|
shortener = _serviceProvider.GetRequiredService<BitLyShortener>();
|
|
}
|
|
else
|
|
{
|
|
shortener = _serviceProvider.GetRequiredService<OnlyoShortener>();
|
|
}
|
|
|
|
return shortener.GetShortenLinkAsync(shareLink);
|
|
}
|
|
}
|
|
|
|
[Scope]
|
|
public class BitLyShortener : IUrlShortener
|
|
{
|
|
public BitLyShortener(ConsumerFactory consumerFactory)
|
|
{
|
|
ConsumerFactory = consumerFactory;
|
|
}
|
|
|
|
private ConsumerFactory ConsumerFactory { get; }
|
|
|
|
public Task<string> GetShortenLinkAsync(string shareLink)
|
|
{
|
|
return Task.FromResult(ConsumerFactory.Get<BitlyLoginProvider>().GetShortenLink(shareLink));
|
|
}
|
|
}
|
|
|
|
[Scope]
|
|
public class OnlyoShortener : IUrlShortener
|
|
{
|
|
private readonly IDbContextFactory<UrlShortenerDbContext> _contextFactory;
|
|
private readonly CommonLinkUtility _commonLinkUtility;
|
|
public OnlyoShortener(IDbContextFactory<UrlShortenerDbContext> contextFactory,
|
|
CommonLinkUtility commonLinkUtility)
|
|
{
|
|
_contextFactory = contextFactory;
|
|
_commonLinkUtility = commonLinkUtility;
|
|
}
|
|
|
|
public async Task<string> GetShortenLinkAsync(string shareLink)
|
|
{
|
|
if (Uri.IsWellFormedUriString(shareLink, UriKind.Absolute))
|
|
{
|
|
var context = _contextFactory.CreateDbContext();
|
|
var link = await context.ShortLinks.FirstOrDefaultAsync(q=> q.Link == shareLink);
|
|
if (link != null)
|
|
{
|
|
return _commonLinkUtility.GetFullAbsolutePath(UrlShortRewriter.BasePath + link.Short);
|
|
}
|
|
else
|
|
{
|
|
while (true)
|
|
{
|
|
var key = ShortUrl.GenerateRandomKey();
|
|
var id = ShortUrl.Decode(key);
|
|
var existId = await context.ShortLinks.AnyAsync(q => q.Id == id);
|
|
if (!existId)
|
|
{
|
|
var newShortLink = new ShortLink()
|
|
{
|
|
Id = id,
|
|
Link = shareLink,
|
|
Short = key
|
|
};
|
|
await context.ShortLinks.AddAsync(newShortLink);
|
|
await context.SaveChangesAsync();
|
|
return _commonLinkUtility.GetFullAbsolutePath(UrlShortRewriter.BasePath + key);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return shareLink;
|
|
}
|
|
}
|
|
}
|
|
|
|
public static class ShortUrl
|
|
{
|
|
private const string Alphabet = "5XzpDt6wZRdsTrJkSY_cgPyxN4j-fnb9WKBF8vh3GH72QqmLVCM";
|
|
private static readonly int _base = Alphabet.Length;
|
|
|
|
public static string GenerateRandomKey()
|
|
{
|
|
var rand = new Random();
|
|
var length = rand.Next(5, 8);
|
|
var result = "";
|
|
for (var i = 0; i < length; i++)
|
|
{
|
|
var x = rand.Next(0, 51);
|
|
result += Alphabet.ElementAt(x);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public static long Decode(string str)
|
|
{
|
|
long num = 0;
|
|
for (var i = 0; i < str.Length; i++)
|
|
{
|
|
num = num * _base + Alphabet.IndexOf(str.ElementAt(i));
|
|
}
|
|
return num;
|
|
}
|
|
}
|
|
|
|
public static class UrlShortenerExtension
|
|
{
|
|
public static void Register(DIHelper dIHelper)
|
|
{
|
|
dIHelper.TryAdd<IUrlShortener, BaseUrlShortener>();
|
|
dIHelper.TryAdd<BitLyShortener>();
|
|
dIHelper.TryAdd<OnlyoShortener>();
|
|
}
|
|
} |