OpenTween/Thumbnail/Services/FoursquareCheckin.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.Net.Http;
  25 using System.Runtime.Serialization.Json;
  26 using System.Text.RegularExpressions;
  27 using System.Threading;
  28 using System.Threading.Tasks;
  29 using System.Web;
  30 using System.Xml;
  31 using System.Xml.Linq;
  32 using System.Xml.XPath;
  33 using OpenTween.Connection;
  34
  35 namespace OpenTween.Thumbnail.Services
  36 {
  37     class FoursquareCheckin : IThumbnailService
  38     {
  39         public static readonly Regex UrlPatternRegex =
  40             new Regex(@"^https?://(?:foursquare\.com|www\.swarmapp\.com)/(?:c/|.+?/checkin/)(?<checkin_id>[0-9a-z]+)(?:\?s=(?<signature>[^&]+))?");
  41
  42         public static readonly string ApiBase = "https://api.foursquare.com/v2";
  43
  44         protected HttpClient http
  45         {
  46             get { return this.localHttpClient ?? Networking.Http; }
  47         }
  48         private readonly HttpClient localHttpClient;
  49
  50         public FoursquareCheckin()
  51             : this(null)
  52         {
  53         }
  54
  55         public FoursquareCheckin(HttpClient http)
  56         {
  57             this.localHttpClient = http;
  58         }
  59
  60         public override async Task<ThumbnailInfo> GetThumbnailInfoAsync(string url, PostClass post, CancellationToken token)
  61         {
  62             // ツイートに位置情報が付与されている場合は何もしない
  63             if (post.PostGeo != null)
  64                 return null;
  65
  66             var match = UrlPatternRegex.Match(url);
  67
  68             if (!match.Success)
  69                 return null;
  70
  71             var checkinIdGroup = match.Groups["checkin_id"];
  72             var signatureGroup = match.Groups["signature"];
  73
  74             try
  75             {
  76                 // Foursquare のベニュー情報を取得
  77                 // 参照: https://developer.foursquare.com/docs/venues/venues
  78
  79                 var query = new Dictionary<string, string>
  80                 {
  81                     ["client_id"] = ApplicationSettings.FoursquareClientId,
  82                     ["client_secret"] = ApplicationSettings.FoursquareClientSecret,
  83                     ["v"] = "20140419", // https://developer.foursquare.com/overview/versioning
  84                 };
  85
  86                 if (signatureGroup.Success)
  87                     query["signature"] = signatureGroup.Value;
  88
  89                 var apiUrl = new Uri(ApiBase + "/checkins/" + checkinIdGroup.Value + "?" + MyCommon.BuildQueryString(query));
  90
  91                 using (var response = await this.http.GetAsync(apiUrl, token).ConfigureAwait(false))
  92                 {
  93                     response.EnsureSuccessStatusCode();
  94
  95                     var jsonBytes = await response.Content.ReadAsByteArrayAsync()
  96                         .ConfigureAwait(false);
  97
  98                     var location = ParseIntoLocation(jsonBytes);
  99                     if (location == null)
 100                         return null;
 101
 102                     var map = MapThumb.GetDefaultInstance();
 103
 104                     return await map.GetThumbnailInfoAsync(new PostClass.StatusGeo(location.Longitude, location.Latitude))
 105                         .ConfigureAwait(false);
 106                 }
 107             }
 108             catch (HttpRequestException) { }
 109
 110             return null;
 111         }
 112
 113         internal static GlobalLocation ParseIntoLocation(byte[] jsonBytes)
 114         {
 115             using (var jsonReader = JsonReaderWriterFactory.CreateJsonReader(jsonBytes, XmlDictionaryReaderQuotas.Max))
 116             {
 117                 var xElm = XElement.Load(jsonReader);
 118
 119                 var locationElm = xElm.XPathSelectElement("/response/checkin/venue/location");
 120
 121                 // 座標が得られなかった場合
 122                 if (locationElm == null)
 123                     return null;
 124
 125                 // 月など、地球以外の星の座標である場合
 126                 var planetElm = locationElm.Element("planet");
 127                 if (planetElm != null && planetElm.Value != "earth")
 128                     return null;
 129
 130                 return new GlobalLocation
 131                 {
 132                     Latitude = double.Parse(locationElm.Element("lat").Value),
 133                     Longitude = double.Parse(locationElm.Element("lng").Value),
 134                 };
 135             }
 136         }
 137     }
 138 }