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[opentween/open-tween.git] / OpenTween / Thumbnail / Services / SimpleThumbnailService.cs
1 // OpenTween - Client of Twitter
2 // Copyright (c) 2012 kim_upsilon (@kim_upsilon) <https://upsilo.net/~upsilon/>
3 // All rights reserved.
4 //
5 // This file is part of OpenTween.
6 //
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)
10 // any later version.
11 //
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
15 // for more details.
16 //
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.
21
22 using System;
23 using System.Collections.Generic;
24 using System.Linq;
25 using System.Net.Http;
26 using System.Text;
27 using System.Text.RegularExpressions;
28 using System.Threading;
29 using System.Threading.Tasks;
30 using OpenTween.Models;
31
32 namespace OpenTween.Thumbnail.Services
33 {
34     /// <summary>
35     /// 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
36     /// </summary>
37     class SimpleThumbnailService : IThumbnailService
38     {
39         protected Regex regex;
40         protected string thumb_replacement;
41         protected string fullsize_replacement;
42
43         public SimpleThumbnailService(string pattern, string replacement)
44             : this(pattern, replacement, null)
45         {
46         }
47
48         public SimpleThumbnailService(string pattern, string replacement, string file_replacement)
49         {
50             this.regex = new Regex(pattern, RegexOptions.IgnoreCase);
51             this.thumb_replacement = replacement;
52             this.fullsize_replacement = file_replacement;
53         }
54
55         public override Task<ThumbnailInfo> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
56         {
57             return Task.Run(() =>
58             {
59                 var thumbnailUrl = this.ReplaceUrl(url);
60                 if (thumbnailUrl == null) return null;
61
62                 return new ThumbnailInfo
63                 {
64                     MediaPageUrl = url,
65                     ThumbnailImageUrl = thumbnailUrl,
66                     TooltipText = null,
67                     FullSizeImageUrl = ReplaceUrl(url, this.fullsize_replacement)
68                 };
69             }, token);
70         }
71
72         protected string ReplaceUrl(string url)
73             => this.ReplaceUrl(url, this.thumb_replacement);
74
75         protected string ReplaceUrl(string url, string replacement)
76         {
77             if (replacement == null) return null;
78             var match = this.regex.Match(url);
79
80             return match.Success ? match.Result(replacement) : null;
81         }
82     }
83 }