OpenTween/Thumbnail/Services/Tinami.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.Text;
  26 using System.Threading;
  27 using System.Threading.Tasks;
  28 using System.Runtime.Serialization.Json;
  29 using System.Xml;
  30 using System.Xml.Linq;
  31 using System.Xml.XPath;
  32 using System.Net;
  33
  34 namespace OpenTween.Thumbnail.Services
  35 {
  36     class Tinami : SimpleThumbnailService
  37     {
  38         public Tinami(string pattern, string replacement = "${0}")
  39             : base(pattern, replacement)
  40         {
  41         }
  42
  43         public override async Task<ThumbnailInfo> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
  44         {
  45             var apiUrl = base.ReplaceUrl(url);
  46             if (apiUrl == null) return null;
  47
  48             var xdoc = await this.FetchContentInfoApiAsync(apiUrl, token)
  49                 .ConfigureAwait(false);
  50
  51             if (xdoc.XPathSelectElement("/rsp").Attribute("stat").Value == "ok")
  52             {
  53                 var thumbUrlElm = xdoc.XPathSelectElement("/rsp/content/thumbnails/thumbnail_150x150");
  54                 if (thumbUrlElm != null)
  55                 {
  56                     var descElm = xdoc.XPathSelectElement("/rsp/content/description");
  57
  58                     return new ThumbnailInfo
  59                     {
  60                         ImageUrl = url,
  61                         ThumbnailUrl = thumbUrlElm.Attribute("url").Value,
  62                         TooltipText = descElm == null ? null : descElm.Value,
  63                     };
  64                 }
  65             }
  66
  67             return null;
  68         }
  69
  70         protected virtual async Task<XDocument> FetchContentInfoApiAsync(string url, CancellationToken token)
  71         {
  72             using (var response = await this.http.GetAsync(url, token).ConfigureAwait(false))
  73             {
  74                 response.EnsureSuccessStatusCode();
  75
  76                 var xmlStr = await response.Content.ReadAsStringAsync()
  77                     .ConfigureAwait(false);
  78
  79                 return XDocument.Parse(xmlStr);
  80             }
  81         }
  82     }
  83 }