display news on dashboard home page

MediaBrowser.Server.Implementations/MediaBrowser.Server.Implementations.csproj

@@ -173,6 +173,7 @@
     <Compile Include="LiveTv\RefreshChannelsScheduledTask.cs" />
     <Compile Include="Localization\LocalizationManager.cs" />
     <Compile Include="MediaEncoder\MediaEncoder.cs" />
+    <Compile Include="News\NewsService.cs" />
     <Compile Include="Persistence\SqliteChapterRepository.cs" />
     <Compile Include="Persistence\SqliteExtensions.cs" />
     <Compile Include="Persistence\SqliteMediaStreamsRepository.cs" />

MediaBrowser.Server.Implementations/News/NewsService.cs

@@ -0,0 +1,132 @@
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Common.IO;
+using MediaBrowser.Common.Net;
+using MediaBrowser.Controller.News;
+using MediaBrowser.Model.News;
+using MediaBrowser.Model.Querying;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Xml;
+
+namespace MediaBrowser.Server.Implementations.News
+{
+    public class NewsService : INewsService
+    {
+        private readonly IApplicationPaths _appPaths;
+        private readonly IFileSystem _fileSystem;
+        private readonly IHttpClient _httpClient;
+
+        public NewsService(IApplicationPaths appPaths, IFileSystem fileSystem, IHttpClient httpClient)
+        {
+            _appPaths = appPaths;
+            _fileSystem = fileSystem;
+            _httpClient = httpClient;
+        }
+
+        public async Task<QueryResult<NewsItem>> GetProductNews(NewsQuery query)
+        {
+            var path = Path.Combine(_appPaths.CachePath, "news.xml");
+
+            await EnsureNewsFile(path).ConfigureAwait(false);
+
+            var items = GetNewsItems(path);
+
+            var itemsArray = items.ToArray();
+            var count = itemsArray.Length;
+
+            if (query.StartIndex.HasValue)
+            {
+                itemsArray = itemsArray.Skip(query.StartIndex.Value).ToArray();
+            }
+
+            if (query.Limit.HasValue)
+            {
+                itemsArray = itemsArray.Take(query.Limit.Value).ToArray();
+            }
+
+            return new QueryResult<NewsItem>
+            {
+                Items = itemsArray,
+                TotalRecordCount = count
+            };
+        }
+
+        private IEnumerable<NewsItem> GetNewsItems(string path)
+        {
+            var xmlDoc = new XmlDocument();
+
+            xmlDoc.Load(path);
+
+            return ParseRssItems(xmlDoc);
+        }
+
+        private IEnumerable<NewsItem> ParseRssItems(XmlDocument xmlDoc)
+        {
+            var nodes = xmlDoc.SelectNodes("rss/channel/item");
+
+            if (nodes == null)
+            {
+                yield return null;
+            }
+
+            foreach (XmlNode node in nodes)
+            {
+                var newsItem = new NewsItem();
+
+                newsItem.Title = ParseDocElements(node, "title");
+
+                newsItem.Description = ParseDocElements(node, "description");
+
+                newsItem.Link = ParseDocElements(node, "link");
+
+                var date = ParseDocElements(node, "pubDate");
+                DateTime parsedDate;
+
+                if (DateTime.TryParse(date, out parsedDate))
+                {
+                    newsItem.Date = parsedDate;
+                }
+
+                yield return newsItem;
+            }
+        }
+
+        private string ParseDocElements(XmlNode parent, string xPath)
+        {
+            var node = parent.SelectSingleNode(xPath);
+
+            return node != null ? node.InnerText : "Unresolvable";
+        }
+
+
+        /// <summary>
+        /// Ensures the news file.
+        /// </summary>
+        /// <param name="path">The path.</param>
+        /// <returns>Task.</returns>
+        private async Task EnsureNewsFile(string path)
+        {
+            var info = _fileSystem.GetFileSystemInfo(path);
+
+            if (!info.Exists || (DateTime.UtcNow - _fileSystem.GetLastWriteTimeUtc(info)).TotalHours > 24)
+            {
+                var requestOptions = new HttpRequestOptions
+                {
+                    Url = "http://mediabrowser3.com/community/index.php?/blog/rss/1-media-browser-developers-blog",
+                    Progress = new Progress<double>()
+                };
+
+                using (var stream = await _httpClient.Get(requestOptions).ConfigureAwait(false))
+                {
+                    using (var fileStream = _fileSystem.GetFileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, true))
+                    {
+                        await stream.CopyToAsync(fileStream).ConfigureAwait(false);
+                    }
+                }
+            }
+        }
+    }
+}