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https://github.com/ShareX/ShareX.git
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130 lines
4.8 KiB
C#
130 lines
4.8 KiB
C#
#region License Information (GPL v3)
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/*
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ShareX - A program that allows you to take screenshots and share any file type
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Copyright (C) 2008-2013 ShareX Developers
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Optionally you can also view the license at <http://www.gnu.org/licenses/>.
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*/
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#endregion License Information (GPL v3)
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using HelpersLib;
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using System;
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using System.Globalization;
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using System.IO;
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using System.Net;
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using System.Net.Cache;
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using System.Text;
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using System.Xml;
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using System.Xml.Linq;
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namespace HelpersLib
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{
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public class UpdateChecker
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{
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public string URL { get; private set; }
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public string ApplicationName { get; private set; }
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public Version ApplicationVersion { get; private set; }
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public ReleaseChannelType ReleaseChannel { get; private set; }
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public IWebProxy Proxy { get; private set; }
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public UpdateInfo UpdateInfo { get; private set; }
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public UpdateChecker(string url, string applicationName, Version applicationVersion,
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ReleaseChannelType channel = ReleaseChannelType.Stable, IWebProxy proxy = null)
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{
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URL = url;
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ApplicationName = applicationName;
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ApplicationVersion = applicationVersion;
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ReleaseChannel = channel;
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Proxy = proxy;
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}
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public bool CheckUpdate()
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{
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UpdateInfo = new UpdateInfo();
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UpdateInfo.ReleaseChannel = ReleaseChannel;
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UpdateInfo.CurrentVersion = ApplicationVersion;
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try
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{
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RequestCachePolicy cachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore);
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using (WebClient wc = new WebClient { Proxy = Proxy, CachePolicy = cachePolicy })
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using (MemoryStream ms = new MemoryStream(wc.DownloadData(URL)))
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using (XmlTextReader xml = new XmlTextReader(ms))
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{
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XDocument xd = XDocument.Load(xml);
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if (xd != null)
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{
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string node;
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switch (ReleaseChannel)
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{
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default:
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case ReleaseChannelType.Stable:
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node = "Stable";
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break;
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case ReleaseChannelType.Beta:
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node = "Beta|Stable";
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break;
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case ReleaseChannelType.Dev:
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node = "Dev|Beta|Stable";
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break;
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}
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string path = string.Format("Update/{0}/{1}", ApplicationName, node);
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XElement xe = xd.GetNode(path);
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if (xe != null)
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{
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UpdateInfo.LatestVersion = new Version(xe.GetValue("Version"));
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UpdateInfo.DownloadURL = xe.GetValue("URL");
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UpdateInfo.UpdateNotes = xe.GetValue("Summary");
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UpdateInfo.RefreshStatus();
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if (UpdateInfo.Status == UpdateStatus.UpdateAvailable && !string.IsNullOrEmpty(UpdateInfo.UpdateNotes) &&
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UpdateInfo.UpdateNotes.IsValidUrl())
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{
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try
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{
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wc.Encoding = Encoding.UTF8;
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UpdateInfo.UpdateNotes = wc.DownloadString(UpdateInfo.UpdateNotes.Trim());
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}
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catch (Exception ex)
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{
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DebugHelper.WriteException(ex);
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}
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}
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return true;
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}
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}
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}
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}
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catch (Exception ex)
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{
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DebugHelper.WriteException(ex);
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}
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UpdateInfo.Status = UpdateStatus.UpdateCheckFailed;
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return false;
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}
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}
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} |