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feat: move hello to foreground once window exists #27

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merged 2 commits into from
Nov 23, 2021
Merged

feat: move hello to foreground once window exists #27

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0936d30
feat: move hello to foreground once window exists
jonaskuske Nov 16, 2021
5952048
fix: assign focus task to discarded variable
jonaskuske Nov 16, 2021
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32 changes: 32 additions & 0 deletions win_components/WindowsHelloAuthenticator/WindowsHelloAuthenticator/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,14 @@
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Windows.UI.Popups;
using Windows.Security.Credentials;
using Windows.Security.Cryptography;
using Windows.Security.Cryptography.Core;
using HWND = System.IntPtr;

namespace WindowsHelloAuthenticator
{
Expand Down Expand Up @@ -52,6 +55,28 @@ static string ExitCodeToMessage(int code, string key_name)
return "Unkwon internal error.";
}
}

[DllImport("user32.dll", SetLastError = true)]
static extern HWND FindWindow(string lpClassName, string lpWindowName);

[DllImport("User32.dll", SetLastError = true)]
static extern bool SetForegroundWindow(HWND hWnd);


static async Task<bool> FocusHelloWindow(CancellationToken token)
{
token.ThrowIfCancellationRequested();
HWND hwnd = FindWindow("Credential Dialog Xaml Host", null);

while ((int)hwnd == 0)
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{
await Task.Delay(500);
hwnd = FindWindow("Credential Dialog Xaml Host", null);
token.ThrowIfCancellationRequested();
}

return SetForegroundWindow(hwnd);
}

static async Task<(int err, byte[] sig)> VerifyUser(string key_name, string contentToSign)
{
Expand All @@ -68,7 +93,14 @@ static string ExitCodeToMessage(int code, string key_name)
}

var buf = CryptographicBuffer.ConvertStringToBinary(contentToSign, BinaryStringEncoding.Utf8);

var tokenSource = new CancellationTokenSource();
_ = FocusHelloWindow(tokenSource.Token);

var signRes = await key.Credential.RequestSignAsync(buf);

tokenSource.Cancel();

if (signRes.Status != KeyCredentialStatus.Success)
{
return (CredentialStatusToExitCode(key.Status), null);
Expand Down