OpenTween/Thumbnail/Services/ViaMe.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;
  26 using System.Net.Http;
  27 using System.Runtime.Serialization.Json;
  28 using System.Text;
  29 using System.Text.RegularExpressions;
  30 using System.Threading;
  31 using System.Threading.Tasks;
  32 using System.Xml;
  33 using System.Xml.Linq;
  34 using System.Xml.XPath;
  35 using OpenTween.Connection;
  36 using OpenTween.Models;
  37
  38 namespace OpenTween.Thumbnail.Services
  39 {
  40     class ViaMe : IThumbnailService
  41     {
  42         public static readonly Regex UrlPatternRegex =
  43             new Regex(@"^https?://via\.me/-(\w+)$");
  44
  45         protected HttpClient http
  46             => this.localHttpClient ?? Networking.Http;
  47
  48         private readonly HttpClient localHttpClient;
  49
  50         public ViaMe()
  51             : this(null)
  52         {
  53         }
  54
  55         public ViaMe(HttpClient http)
  56             => this.localHttpClient = http;
  57
  58         public override async Task<ThumbnailInfo> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
  59         {
  60             var match = ViaMe.UrlPatternRegex.Match(url);
  61             if (!match.Success)
  62                 return null;
  63
  64             var postId = match.Groups[1].Value;
  65
  66             try
  67             {
  68                 var apiUrl = "http://via.me/api/v1/posts/" + postId;
  69
  70                 var json = await this.http.GetByteArrayAsync(apiUrl)
  71                     .ConfigureAwait(false);
  72
  73                 using (var jsonReader = JsonReaderWriterFactory.CreateJsonReader(json, XmlDictionaryReaderQuotas.Max))
  74                 {
  75                     var xElm = XElement.Load(jsonReader);
  76
  77                     var thumbUrlElm = xElm.XPathSelectElement("/response/post/thumb_url");
  78                     if (thumbUrlElm == null)
  79                         return null;
  80
  81                     var textElm = xElm.XPathSelectElement("/response/post/text");
  82
  83                     return new ThumbnailInfo
  84                     {
  85                         MediaPageUrl = url,
  86                         ThumbnailImageUrl = thumbUrlElm.Value,
  87                         TooltipText = textElm?.Value,
  88                     };
  89                 }
  90             }
  91             catch (HttpRequestException) { }
  92
  93             return null;
  94         }
  95     }
  96 }