#522 fix Uwp startup

Author: justcoding121

src/Titanium.Web.Proxy/Helpers/RunTime.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Runtime.InteropServices;
+using System.Text;
 #if NETSTANDARD2_0
 using System.Runtime.InteropServices;
 #endif
@@ -53,12 +55,51 @@ public static class RunTime
 #else
         public static bool IsWindows => !IsLinux && !IsMac;
 #endif
+        public static bool IsUwpOnWindows => IsWindows && UwpHelper.IsRunningAsUwp();
 
 #if NETSTANDARD2_0
         public static bool IsMac => isRunningOnMac;
 #else
         public static bool IsMac => isRunningOnMonoMac.Value;
 #endif
 
+        //https://github.com/qmatteoq/DesktopBridgeHelpers/blob/master/DesktopBridge.Helpers/Helpers.cs
+        private class UwpHelper
+        {
+            const long APPMODEL_ERROR_NO_PACKAGE = 15700L;
+
+            [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+            static extern int GetCurrentPackageFullName(ref int packageFullNameLength, StringBuilder packageFullName);
+
+            internal static bool IsRunningAsUwp()
+            {
+                if (IsWindows7OrLower)
+                {
+                    return false;
+                }
+                else
+                {
+                    int length = 0;
+                    var sb = new StringBuilder(0);
+                    int result = GetCurrentPackageFullName(ref length, sb);
+
+                    sb = new StringBuilder(length);
+                    result = GetCurrentPackageFullName(ref length, sb);
+
+                    return result != APPMODEL_ERROR_NO_PACKAGE;
+                }
+            }
+
+            private static bool IsWindows7OrLower
+            {
+                get
+                {
+                    int versionMajor = Environment.OSVersion.Version.Major;
+                    int versionMinor = Environment.OSVersion.Version.Minor;
+                    double version = versionMajor + (double)versionMinor / 10;
+                    return version <= 6.1;
+                }
+            }
+        }
     }
 }

src/Titanium.Web.Proxy/ProxyServer.cs

@@ -102,7 +102,7 @@ public ProxyServer(string rootCertificateName, string rootCertificateIssuerName,
 
             ProxyEndPoints = new List<ProxyEndPoint>();
             tcpConnectionFactory = new TcpConnectionFactory(this);
-            if (!RunTime.IsRunningOnMono && RunTime.IsWindows)
+            if (!RunTime.IsRunningOnMono && RunTime.IsWindows && !RunTime.IsUwpOnWindows)
             {
                 systemProxySettingsManager = new SystemProxyManager();
             }
@@ -542,7 +542,7 @@ public void Start()
 
             // clear any system proxy settings which is pointing to our own endpoint (causing a cycle)
             // due to ungracious proxy shutdown before or something else
-            if (systemProxySettingsManager != null && RunTime.IsWindows)
+            if (systemProxySettingsManager != null && RunTime.IsWindows && !RunTime.IsUwpOnWindows)
             {
                 var proxyInfo = systemProxySettingsManager.GetProxyInfoFromRegistry();
                 if (proxyInfo.Proxies != null)
@@ -593,7 +593,7 @@ public void Stop()
                 throw new Exception("Proxy is not running.");
             }
 
-            if (!RunTime.IsRunningOnMono && RunTime.IsWindows)
+            if (!RunTime.IsRunningOnMono && RunTime.IsWindows && !RunTime.IsUwpOnWindows)
             {
                 bool setAsSystemProxy = ProxyEndPoints.OfType<ExplicitProxyEndPoint>()
                     .Any(x => x.IsSystemHttpProxy || x.IsSystemHttpsProxy);

src/Titanium.Web.Proxy/RequestHandler.cs

@@ -25,7 +25,6 @@ namespace Titanium.Web.Proxy
     /// </summary>
     public partial class ProxyServer
     {
-
         private bool isWindowsAuthenticationEnabledAndSupported =>
             EnableWinAuth && RunTime.IsWindows && !RunTime.IsRunningOnMono;