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using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Notifications;
using MediaBrowser.Controller.Plugins;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.News;
using MediaBrowser.Model.Notifications;
using MediaBrowser.Model.Serialization;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using CommonIO;
using MediaBrowser.Common.Threading;
namespace MediaBrowser.Server.Implementations.News
{
public class NewsEntryPoint : IServerEntryPoint
{
private PeriodicTimer _timer;
private readonly IHttpClient _httpClient;
private readonly IApplicationPaths _appPaths;
private readonly IFileSystem _fileSystem;
private readonly ILogger _logger;
private readonly IJsonSerializer _json;
private readonly INotificationManager _notifications;
private readonly IUserManager _userManager;
private readonly TimeSpan _frequency = TimeSpan.FromHours(24);
public NewsEntryPoint(IHttpClient httpClient, IApplicationPaths appPaths, IFileSystem fileSystem, ILogger logger, IJsonSerializer json, INotificationManager notifications, IUserManager userManager)
{
_httpClient = httpClient;
_appPaths = appPaths;
_fileSystem = fileSystem;
_logger = logger;
_json = json;
_notifications = notifications;
_userManager = userManager;
}
public void Run()
{
_timer = new PeriodicTimer(OnTimerFired, null, TimeSpan.FromMilliseconds(500), _frequency);
}
/// <summary>
/// Called when [timer fired].
/// </summary>
/// <param name="state">The state.</param>
private async void OnTimerFired(object state)
{
var path = Path.Combine(_appPaths.CachePath, "news.json");
try
{
await DownloadNews(path).ConfigureAwait(false);
}
catch (Exception ex)
{
_logger.ErrorException("Error downloading news", ex);
}
}
private async Task DownloadNews(string path)
{
DateTime? lastUpdate = null;
if (_fileSystem.FileExists(path))
{
lastUpdate = _fileSystem.GetLastWriteTimeUtc(path);
}
var requestOptions = new HttpRequestOptions
{
Url = "http://emby.media/community/index.php?/blog/rss/1-media-browser-developers-blog",
Progress = new Progress<double>(),
UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.42 Safari/537.36"
};
using (var stream = await _httpClient.Get(requestOptions).ConfigureAwait(false))
{
var doc = new XmlDocument();
doc.Load(stream);
var news = ParseRssItems(doc).ToList();
_json.SerializeToFile(news, path);
await CreateNotifications(news, lastUpdate, CancellationToken.None).ConfigureAwait(false);
}
}
private Task CreateNotifications(List<NewsItem> items, DateTime? lastUpdate, CancellationToken cancellationToken)
{
if (lastUpdate.HasValue)
{
items = items.Where(i => i.Date.ToUniversalTime() >= lastUpdate.Value)
.ToList();
}
var tasks = items.Select(i => _notifications.SendNotification(new NotificationRequest
{
Date = i.Date,
Name = i.Title,
Description = i.Description,
Url = i.Link,
UserIds = _userManager.Users.Select(u => u.Id.ToString("N")).ToList()
}, cancellationToken));
return Task.WhenAll(tasks);
}
private IEnumerable<NewsItem> ParseRssItems(XmlDocument xmlDoc)
{
var nodes = xmlDoc.SelectNodes("rss/channel/item");
if (nodes != null)
{
foreach (XmlNode node in nodes)
{
var newsItem = new NewsItem();
newsItem.Title = ParseDocElements(node, "title");
newsItem.DescriptionHtml = ParseDocElements(node, "description");
newsItem.Description = newsItem.DescriptionHtml.StripHtml();
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 : string.Empty;
}
public void Dispose()
{
if (_timer != null)
{
_timer.Dispose();
_timer = null;
}
}
}
}
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