Remove ChangeEnvironmentAction class and throw when env flag is set in mod_rewrite rule

.gitignore

@@ -30,4 +30,5 @@ project.lock.json
 .testPublish/
 .idea/
 .vscode/
-
+*.nuget.props
+*.nuget.targets

src/Microsoft.AspNetCore.Rewrite/Internal/ApacheModRewrite/RuleBuilder.cs

@@ -178,8 +178,7 @@ namespace Microsoft.AspNetCore.Rewrite.Internal.ApacheModRewrite
 
             if (flags.GetValue(FlagType.Env, out flag))
             {
-                // parse env
-                _actions.Add(new ChangeEnvironmentAction(flag));
+                throw new NotSupportedException(Resources.Error_ChangeEnvironmentNotSupported);
             }
 
             if (flags.HasFlag(FlagType.Forbidden))

src/Microsoft.AspNetCore.Rewrite/Internal/UrlActions/ChangeEnvironmentAction.cs

@@ -1,22 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System;
-
-namespace Microsoft.AspNetCore.Rewrite.Internal.UrlActions
-{
-    public class ChangeEnvironmentAction : UrlAction
-    {
-        public ChangeEnvironmentAction(string env)
-        {
-            // TODO
-            throw new NotImplementedException("Changing the environment is not implemented");
-        }
-
-        public override void ApplyAction(RewriteContext context, MatchResults ruleMatch, MatchResults condMatch)
-        {
-            // Do stuff to modify the env
-            throw new NotImplementedException("Changing the environment is not implemented");
-        }
-    }
-}

src/Microsoft.AspNetCore.Rewrite/Properties/Resources.Designer.cs

@@ -154,6 +154,22 @@ namespace Microsoft.AspNetCore.Rewrite
             return GetString("Error_IntegerMatch_FormatExceptionMessage");
         }
 
+        /// <summary>
+        /// Error adding a mod_rewrite rule. The change environment flag is not supported.
+        /// </summary>
+        internal static string Error_ChangeEnvironmentNotSupported
+        {
+            get { return GetString("Error_ChangeEnvironmentNotSupported"); }
+        }
+
+        /// <summary>
+        /// Error adding a mod_rewrite rule. The change environment flag is not supported.
+        /// </summary>
+        internal static string FormatError_ChangeEnvironmentNotSupported()
+        {
+            return GetString("Error_ChangeEnvironmentNotSupported");
+        }
+
         private static string GetString(string name, params string[] formatterNames)
         {
             var value = _resourceManager.GetString(name);

src/Microsoft.AspNetCore.Rewrite/Resources.resx

@@ -144,4 +144,7 @@
   <data name="Error_IntegerMatch_FormatExceptionMessage" xml:space="preserve">
     <value>Syntax error for integers in comparison.</value>
   </data>
+  <data name="Error_ChangeEnvironmentNotSupported" xml:space="preserve">
+    <value>Error adding a mod_rewrite rule. The change environment flag is not supported.</value>
+  </data>
 </root>

test/Microsoft.AspNetCore.Rewrite.Tests/ApacheModRewrite/RuleBuilderTest.cs

@@ -0,0 +1,24 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using Microsoft.AspNetCore.Rewrite.Internal.ApacheModRewrite;
+using Xunit;
+
+namespace Microsoft.AspNetCore.Rewrite.Tests
+{
+    public class RuleBuilderTest
+    {
+        [Fact]
+        // see https://httpd.apache.org/docs/2.4/rewrite/advanced.html#setenvvars
+        public void AddAction_Throws_ChangeEnvNotSupported()
+        {
+            var builder = new RuleBuilder();
+            var flags = new Flags();
+            flags.SetFlag(FlagType.Env, "rewritten:1");
+
+            var ex = Assert.Throws<NotSupportedException>(() => builder.AddAction(null, flags));
+            Assert.Equal(Resources.Error_ChangeEnvironmentNotSupported, ex.Message);
+        }
+    }
+}