Imported Upstream version 4.3.2.467

Former-commit-id: 9c2cb47f45fa221e661ab616387c9cda183f283d

external/referencesource/System.IdentityModel/System/IdentityModel/LocalAppContextSwitches.cs

@@ -0,0 +1,52 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.IdentityModel
+{
+    using System;
+    using System.Runtime.CompilerServices;
+
+    // When adding a quirk, name it such that false is new behavior and true is old behavior.
+    // You are opting IN to old behavior. The new behavior is default.
+    // For example, we want to enable the functionality to explicitly add a connection close header
+    // in 4.6 and above. So we set DisableExplicitConnectionCloseHeader to true if running 4.5.2 or less.
+    internal static class LocalAppContextSwitches
+    {
+        private const string EnableCachedEmptyDefaultAuthorizationContextString = "Switch.System.IdentityModel.EnableCachedEmptyDefaultAuthorizationContext";
+        private const string DisableMultipleDNSEntriesInSANCertificateString = "Switch.System.IdentityModel.DisableMultipleDNSEntriesInSANCertificate";
+
+        private static int enableCachedEmptyDefaultAuthorizationContext;
+        private static int disableMultipleDNSEntriesInSANCertificate;
+
+        public static bool EnableCachedEmptyDefaultAuthorizationContext
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get
+            {
+                return LocalAppContext.GetCachedSwitchValue(EnableCachedEmptyDefaultAuthorizationContextString, ref enableCachedEmptyDefaultAuthorizationContext);
+            }
+        }
+
+        public static bool DisableMultipleDNSEntriesInSANCertificate
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get
+            {
+                return LocalAppContext.GetCachedSwitchValue(DisableMultipleDNSEntriesInSANCertificateString, ref disableMultipleDNSEntriesInSANCertificate);
+            }
+        }
+
+        public static void SetDefaultsLessOrEqual_452()
+        {
+            // Define the switches that should be true for 4.5.2 or less, false for 4.6+.
+            LocalAppContext.DefineSwitchDefault(EnableCachedEmptyDefaultAuthorizationContextString, true);
+        }
+
+        public static void SetDefaultsLessOrEqual_46()
+        {
+            // Define the switches that should be true for 4.6 or less, false for 4.6.1+.
+            LocalAppContext.DefineSwitchDefault(DisableMultipleDNSEntriesInSANCertificateString, true);
+        }
+    }
+}