1 // OpenTween - Client of Twitter
2 // Copyright (c) 2012 kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
3 // All rights reserved.
5 // This file is part of OpenTween.
7 // This program is free software; you can redistribute it and/or modify it
8 // under the terms of the GNU General Public License as published by the Free
9 // Software Foundation; either version 3 of the License, or (at your option)
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 // You should have received a copy of the GNU General Public License along
18 // with this program. If not, see <http://www.gnu.org/licenses/>, or write to
19 // the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
20 // Boston, MA 02110-1301, USA.
25 using System.Collections.Generic;
27 using System.Net.Http;
29 using System.Text.RegularExpressions;
30 using System.Threading;
31 using System.Threading.Tasks;
32 using OpenTween.Models;
34 namespace OpenTween.Thumbnail.Services
37 /// 正規表現によるURLの単純な置換でサムネイルURLを生成する
39 class SimpleThumbnailService : IThumbnailService
41 protected Regex regex;
42 protected string thumb_replacement;
43 protected string? fullsize_replacement;
45 public SimpleThumbnailService(string pattern, string replacement)
46 : this(pattern, replacement, null)
50 public SimpleThumbnailService(string pattern, string replacement, string? file_replacement)
52 this.regex = new Regex(pattern, RegexOptions.IgnoreCase);
53 this.thumb_replacement = replacement;
54 this.fullsize_replacement = file_replacement;
57 public override Task<ThumbnailInfo?> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
61 var thumbnailUrl = this.ReplaceUrl(url);
62 if (thumbnailUrl == null) return null;
64 return new ThumbnailInfo
67 ThumbnailImageUrl = thumbnailUrl,
69 FullSizeImageUrl = ReplaceUrl(url, this.fullsize_replacement)
74 protected string? ReplaceUrl(string url)
75 => this.ReplaceUrl(url, this.thumb_replacement);
77 protected string? ReplaceUrl(string url, string? replacement)
79 if (replacement == null) return null;
80 var match = this.regex.Match(url);
82 return match.Success ? match.Result(replacement) : null;