Unblock Internet files on startup (#15)

NativeConstants.cs

@@ -0,0 +1,10 @@
+namespace CnCNet.LauncherStub;
+
+internal static class NativeConstants
+{
+    /// ERROR_FILE_NOT_FOUND -> 2L
+    public const int ERROR_FILE_NOT_FOUND = 2;
+
+    /// ERROR_ACCESS_DENIED -> 5L
+    public const int ERROR_ACCESS_DENIED = 5;
+}

NativeMethods.cs

@@ -0,0 +1,13 @@
+namespace CnCNet.LauncherStub;
+
+using System.Runtime.InteropServices;
+
+internal static class NativeMethods
+{
+    [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+#if NET45_OR_GREATER || NETSTANDARD || NET
+    [DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
+#endif
+    [return: MarshalAs(UnmanagedType.Bool)]
+    public static extern bool DeleteFile(string name);
+}

Program.cs

@@ -8,6 +8,7 @@
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using Microsoft.Win32;
 
 internal sealed class Program
@@ -87,6 +88,21 @@ private static void RequireDotNetFramework()
     [STAThread]
     private static void Main(string[] args)
     {
+        try
+        {
+            RemoveZoneIdentifer(CurrentDirectory);
+        }
+        catch (Exception ex)
+        {
+            bool ignoreUnblocking = AdvancedMessageBoxHelper.ShowYesNoMessageBox(
+                   "An error occured when the launcher tried to unblock files. Re-running the launcher with administrator privileges might help.\n\n" + ex.ToString(),
+                   "Client Launcher Warning",
+                   yesText: "Continue", noText: "Exit");
+
+            if (!ignoreUnblocking)
+                Environment.Exit(1);
+        }
+
         try
         {
             foreach (string arg in args)
@@ -163,6 +179,37 @@ private static void RunDialogTest()
         msgbox.ShowDialog();
     }
 
+    private static void RemoveZoneIdentifer(string directory)
+    {
+        // https://stackoverflow.com/a/6375373
+
+        List<string> failedMessages = [];
+
+        // Enumerate all files recursively
+        string[] files = Directory.GetFiles(directory, "*", SearchOption.AllDirectories);
+        string[] directories = Directory.GetDirectories(directory, "*", SearchOption.AllDirectories);
+
+        // For each file or directory, remove the Zone.Identifier alternate data stream
+        foreach (string file in files.Concat(directories))
+        {
+            string zoneIdentifier = file + ":Zone.Identifier";
+            bool success = NativeMethods.DeleteFile(zoneIdentifier);
+            if (!success)
+            {
+                int error = Marshal.GetLastWin32Error();
+                if (error == NativeConstants.ERROR_FILE_NOT_FOUND)
+                    continue;
+
+                string errorMessage = new Win32Exception(error).Message;
+
+                failedMessages.Add($"{file}: {errorMessage}");
+            }
+        }
+
+        if (failedMessages.Count > 0)
+            throw new Exception("Failed to remove Zone.Identifier from the following files:\n" + string.Join("\n", failedMessages));
+    }
+
     private static void RunXNA()
     {
         RequireXna();