CODEWITHSUNDEEP
uwpwindows-10desktop-bridgemicrosoft-edge-extension
raghurk
raghurk

Reputation: 41

Edge Extension Native Messaging: UWP app is closed if no response sent back to Edge browser/Extension

Every request from Edge browser needs a corresponding response to be sent. If not, the companion UWP(and the associated Win32 App, if any) exit citing "SystemPolicy" as the reason. To illustrate the problem, I can refer to the SecureInput sample. 

    /// <summary>
    /// Receives message from Extension (via Edge)
    /// </summary>
    private async void OnAppServiceRequestReceived(AppServiceConnection sender, AppServiceRequestReceivedEventArgs args)
    {
        AppServiceDeferral messageDeferral = args.GetDeferral();

        try
        {
            if (this.desktopBridgeAppLaunched)
            {
                this.currentConnectionIndex = Int32.Parse(sender.AppServiceName);
                this.desktopBridgeConnection = desktopBridgeConnections[this.currentConnectionIndex];

                // Send message to the desktopBridge component and wait for response
                AppServiceResponse desktopBridgeResponse = await this.desktopBridgeConnection.SendMessageAsync(args.Request.Message);
                await args.Request.SendResponseAsync(desktopBridgeResponse.Message);
            }
            else
            {
                throw new Exception("Failed to launch desktopBridge App!");
            }
        }
        finally
        {
            messageDeferral.Complete();
        }
    }

By commenting out the line that calls "SendResponseAsync(...)", the UWP and the Win32 App(PasswordInputProtection.exe) are exiting because of the "OnAppServicesCanceled(...)" handler being invoked with SystemPolicy reason.

I understand that for this particular example, it's meaningless not to send a response back. But I have scenarios where there's no need send a response back to the Edge Extension. Instead, I intend to use SendMessageAsync(...) from the Win32 App to communicate with the Extension through the UWP App.

Also, I noticed that the native messaging samples I found online send at-least a useless ACK message back to the Extension from the UWP. So, Is it by design that a response needs to be sent or am I missing something here?

Upvotes: 4

Views: 556

Answers (1)

Stefan Wick MSFT
Stefan Wick MSFT

Reputation: 13850

The Edge team has investigated this and confirmed it's a bug in one of their components. They are working on a fix for the next update. Until the fix is out, you will need to always send a response.

Thanks for reporting the problem, and sorry for the inconvenience this may cause!

Upvotes: 1

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