add workaround for FileZilla downloads

changelog.md

@@ -10,6 +10,10 @@ __[new features]__
 
 * Update support for MariaDB 11.4 is added.
 
+__[changes]__
+
+* Add workaround for failing downloads of FileZilla Client.
+
 __[maintenance]__
 
 * Update certificate information for Firefox ESR installers.

updater/operations/Update.cs

@@ -407,7 +407,7 @@ private static string Download(string url, bool showProgress)
                 }
             }
             string localFile = Path.Combine(cacheDirectory, basename);
-            using (WebClient wc = showProgress ? new ProgressReportingWebClient() : new WebClient())
+            using (WebClient wc = showProgress ? new ProgressReportingWebClient() : new AutoDecompressWebClient())
             {
                 var lowerCaseUrl = url.ToLowerInvariant();
                 if (lowerCaseUrl.Contains("filezilla") || lowerCaseUrl.Contains("mariadb"))
@@ -416,6 +416,10 @@ private static string Download(string url, bool showProgress)
                     // (Yes, I am pointing at you, FileZilla download server!)
                     // Let's pretend we are Firefox ESR downloading the file.
                     wc.Headers.Add(HttpRequestHeader.UserAgent, "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0");
+                    if (lowerCaseUrl.Contains("filezilla"))
+                    {
+                        wc.Headers.Add(HttpRequestHeader.Accept, "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8");
+                    }
                 }
                 if (lowerCaseUrl.Contains("irfanview"))
                 {

updater/utility/AutoDecompressWebClient.cs

@@ -0,0 +1,51 @@
+/*
+    This file is part of the updater command line interface.
+    Copyright (C) 2024  Dirk Stolle
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+using System;
+using System.Net;
+
+namespace updater.utility
+{
+    /// <summary>
+    /// WebClient that automatically adds automatic decompression.
+    /// </summary>
+    public class AutoDecompressWebClient : WebClient
+    {
+        /// <summary>
+        /// Initializes a new instance of ProgressReportingWebClient.
+        /// </summary>
+        public AutoDecompressWebClient() : base()
+        {
+        }
+
+
+        protected override WebRequest GetWebRequest(Uri address)
+        {
+            if (address.OriginalString.ToLowerInvariant().Contains("filezilla"))
+            {
+                var req = base.GetWebRequest(address) as HttpWebRequest;
+                req.AutomaticDecompression = DecompressionMethods.All;
+                return req;
+            }
+            else
+            {
+                return base.GetWebRequest(address);
+            }
+        }
+    }
+}

updater/utility/ProgressReportingWebClient.cs

@@ -42,6 +42,14 @@ public ProgressReportingWebClient() : base()
         }
 
 
+        protected override WebRequest GetWebRequest(Uri address)
+        {
+            var req = base.GetWebRequest(address) as HttpWebRequest;
+            req.AutomaticDecompression = DecompressionMethods.All;
+            return req;
+        }
+
+
         /// <summary>
         /// Time when the current request started.
         /// Should be set manually before the start of each request / download,