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+using MediaBrowser.Common.Configuration;
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+using MediaBrowser.Common.IO;
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+using MediaBrowser.Common.Net;
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+using MediaBrowser.Controller.News;
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+using MediaBrowser.Model.News;
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+using MediaBrowser.Model.Querying;
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+using System;
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+using System.Collections.Generic;
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+using System.IO;
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+using System.Linq;
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+using System.Threading.Tasks;
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+using System.Xml;
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+
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+namespace MediaBrowser.Server.Implementations.News
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+{
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+ public class NewsService : INewsService
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+ {
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+ private readonly IApplicationPaths _appPaths;
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+ private readonly IFileSystem _fileSystem;
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+ private readonly IHttpClient _httpClient;
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+
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+ public NewsService(IApplicationPaths appPaths, IFileSystem fileSystem, IHttpClient httpClient)
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+ {
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+ _appPaths = appPaths;
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+ _fileSystem = fileSystem;
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+ _httpClient = httpClient;
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+ }
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+
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+ public async Task<QueryResult<NewsItem>> GetProductNews(NewsQuery query)
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+ {
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+ var path = Path.Combine(_appPaths.CachePath, "news.xml");
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+
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+ await EnsureNewsFile(path).ConfigureAwait(false);
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+
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+ var items = GetNewsItems(path);
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+
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+ var itemsArray = items.ToArray();
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+ var count = itemsArray.Length;
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+
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+ if (query.StartIndex.HasValue)
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+ {
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+ itemsArray = itemsArray.Skip(query.StartIndex.Value).ToArray();
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+ }
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+
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+ if (query.Limit.HasValue)
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+ {
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+ itemsArray = itemsArray.Take(query.Limit.Value).ToArray();
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+ }
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+
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+ return new QueryResult<NewsItem>
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+ {
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+ Items = itemsArray,
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+ TotalRecordCount = count
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+ };
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+ }
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+
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+ private IEnumerable<NewsItem> GetNewsItems(string path)
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+ {
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+ var xmlDoc = new XmlDocument();
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+
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+ xmlDoc.Load(path);
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+
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+ return ParseRssItems(xmlDoc);
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+ }
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+
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+ private IEnumerable<NewsItem> ParseRssItems(XmlDocument xmlDoc)
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+ {
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+ var nodes = xmlDoc.SelectNodes("rss/channel/item");
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+
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+ if (nodes == null)
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+ {
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+ yield return null;
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+ }
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+
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+ foreach (XmlNode node in nodes)
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+ {
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+ var newsItem = new NewsItem();
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+
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+ newsItem.Title = ParseDocElements(node, "title");
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+
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+ newsItem.Description = ParseDocElements(node, "description");
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+
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+ newsItem.Link = ParseDocElements(node, "link");
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+
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+ var date = ParseDocElements(node, "pubDate");
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+ DateTime parsedDate;
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+
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+ if (DateTime.TryParse(date, out parsedDate))
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+ {
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+ newsItem.Date = parsedDate;
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+ }
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+
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+ yield return newsItem;
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+ }
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+ }
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+
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+ private string ParseDocElements(XmlNode parent, string xPath)
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+ {
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+ var node = parent.SelectSingleNode(xPath);
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+
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+ return node != null ? node.InnerText : "Unresolvable";
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+ }
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+
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+
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+ /// <summary>
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+ /// Ensures the news file.
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+ /// </summary>
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+ /// <param name="path">The path.</param>
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+ /// <returns>Task.</returns>
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+ private async Task EnsureNewsFile(string path)
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+ {
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+ var info = _fileSystem.GetFileSystemInfo(path);
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+
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+ if (!info.Exists || (DateTime.UtcNow - _fileSystem.GetLastWriteTimeUtc(info)).TotalHours > 24)
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+ {
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+ var requestOptions = new HttpRequestOptions
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+ {
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+ Url = "http://mediabrowser3.com/community/index.php?/blog/rss/1-media-browser-developers-blog",
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+ Progress = new Progress<double>()
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+ };
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+
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+ using (var stream = await _httpClient.Get(requestOptions).ConfigureAwait(false))
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+ {
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+ using (var fileStream = _fileSystem.GetFileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, true))
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+ {
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+ await stream.CopyToAsync(fileStream).ConfigureAwait(false);
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+ }
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+ }
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+ }
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+ }
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+ }
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+}
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