mirror of
https://github.com/greenshot/greenshot.git
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89 lines
3.3 KiB
C#
89 lines
3.3 KiB
C#
/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2016 Thomas Braun, Jens Klingen, Robin Krom
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*
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* For more information see: http://getgreenshot.org/
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* The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 1 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*/
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using GreenshotPlugin.Core;
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using System.Diagnostics;
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using System.Net;
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using log4net;
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namespace Greenshot.Help
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{
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/// <summary>
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/// Description of HelpFileLoader.
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/// </summary>
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public static class HelpFileLoader
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{
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private static readonly ILog Log = LogManager.GetLogger(typeof(HelpFileLoader));
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private const string ExtHelpUrl = @"http://getgreenshot.org/help/";
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public static void LoadHelp() {
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string uri = FindOnlineHelpUrl(Language.CurrentLanguage) ?? Language.HelpFilePath;
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Process.Start(uri);
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}
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/// <returns>URL of help file in selected ietf, or (if not present) default ietf, or null (if not present, too. probably indicating that there is no internet connection)</returns>
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private static string FindOnlineHelpUrl(string currentIETF) {
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string ret = null;
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string extHelpUrlForCurrrentIETF = ExtHelpUrl;
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if(!currentIETF.Equals("en-US")) {
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extHelpUrlForCurrrentIETF += currentIETF.ToLower() + "/";
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}
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HttpStatusCode? httpStatusCode = GetHttpStatus(extHelpUrlForCurrrentIETF);
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if(httpStatusCode == HttpStatusCode.OK) {
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ret = extHelpUrlForCurrrentIETF;
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} else if(httpStatusCode != null && !extHelpUrlForCurrrentIETF.Equals(ExtHelpUrl)) {
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Log.DebugFormat("Localized online help not found at {0}, will try {1} as fallback", extHelpUrlForCurrrentIETF, ExtHelpUrl);
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httpStatusCode = GetHttpStatus(ExtHelpUrl);
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if(httpStatusCode == HttpStatusCode.OK) {
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ret = ExtHelpUrl;
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} else {
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Log.WarnFormat("{0} returned status {1}", ExtHelpUrl, httpStatusCode);
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}
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} else if(httpStatusCode == null){
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Log.Info("Internet connection does not seem to be available, will load help from file system.");
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}
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return ret;
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}
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/// <summary>
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/// Retrieves HTTP status for a given url.
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/// </summary>
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/// <param name="url">URL for which the HTTP status is to be checked</param>
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/// <returns>An HTTP status code, or null if there is none (probably indicating that there is no internet connection available</returns>
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private static HttpStatusCode? GetHttpStatus(string url) {
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try {
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HttpWebRequest req = NetworkHelper.CreateWebRequest(url);
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using (HttpWebResponse res = (HttpWebResponse)req.GetResponse())
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{
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return res.StatusCode;
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}
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} catch (WebException e) {
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return ((HttpWebResponse) e.Response)?.StatusCode;
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}
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}
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}
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}
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