bloxstrap/Bloxstrap/ProtocolHandler.cs

using System.Web;
using System.Windows;

using Microsoft.Win32;

namespace Bloxstrap
{
    static class ProtocolHandler
    {
        private const string RobloxPlaceKey = "Roblox.Place";

        public static void Register(string key, string name, string handler, string handlerParam = "%1")
        {
            string handlerArgs = $"\"{handler}\" {handlerParam}";
            
            using var uriKey = Registry.CurrentUser.CreateSubKey($@"Software\Classes\{key}");
            using var uriIconKey = uriKey.CreateSubKey("DefaultIcon");
            using var uriCommandKey = uriKey.CreateSubKey(@"shell\open\command");

            if (uriKey.GetValue("") is null)
            {
                uriKey.SetValue("", $"URL: {name} Protocol");
                uriKey.SetValue("URL Protocol", "");
            }

            if (uriCommandKey.GetValue("") as string != handlerArgs)
            {
                uriIconKey.SetValue("", handler);
                uriCommandKey.SetValue("", handlerArgs);
            }
        }

        public static void RegisterRobloxPlace(string handler)
        {
            const string keyValue = "Roblox Place";
            string handlerArgs = $"\"{handler}\" -ide \"%1\"";
            string iconValue = $"{handler},0";

            using RegistryKey uriKey = Registry.CurrentUser.CreateSubKey(@"Software\Classes\" + RobloxPlaceKey);
            using RegistryKey uriIconKey = uriKey.CreateSubKey("DefaultIcon");
            using RegistryKey uriOpenKey = uriKey.CreateSubKey(@"shell\Open");
            using RegistryKey uriCommandKey = uriOpenKey.CreateSubKey(@"command");

            if (uriKey.GetValue("") as string != keyValue)
                uriKey.SetValue("", keyValue);

            if (uriCommandKey.GetValue("") as string != handlerArgs)
                uriCommandKey.SetValue("", handlerArgs);

            if (uriOpenKey.GetValue("") as string != "Open")
                uriOpenKey.SetValue("", "Open");

            if (uriIconKey.GetValue("") as string != iconValue)
                uriIconKey.SetValue("", iconValue);
        }

        public static void RegisterExtension(string key)
        {
            using RegistryKey uriKey = Registry.CurrentUser.CreateSubKey($@"Software\Classes\{key}");
            uriKey.CreateSubKey(RobloxPlaceKey + @"\ShellNew");

            if (uriKey.GetValue("") as string != RobloxPlaceKey)
                uriKey.SetValue("", RobloxPlaceKey);
        }

        public static void Unregister(string key)
        {
            try
            {
                Registry.CurrentUser.DeleteSubKeyTree($@"Software\Classes\{key}");
            }
            catch (Exception ex)
            {
                App.Logger.WriteLine("Protocol::Unregister", $"Failed to unregister {key}: {ex}");
            }
        }
    }
}