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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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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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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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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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await EnsureNewsFile(path).ConfigureAwait(false);
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var items = GetNewsItems(path);
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var itemsArray = items.ToArray();
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var count = itemsArray.Length;
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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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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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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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private IEnumerable<NewsItem> GetNewsItems(string path)
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{
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var xmlDoc = new XmlDocument();
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xmlDoc.Load(path);
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return ParseRssItems(xmlDoc);
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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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if (nodes == null)
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{
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yield return null;
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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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newsItem.Title = ParseDocElements(node, "title");
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newsItem.Description = ParseDocElements(node, "description");
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newsItem.Link = ParseDocElements(node, "link");
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var date = ParseDocElements(node, "pubDate");
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DateTime parsedDate;
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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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yield return newsItem;
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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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return node != null ? node.InnerText : "Unresolvable";
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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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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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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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