[Feature Flags] Handle anonymous users (#7021)

See: #7019

Author: loic-sharma

src/NuGetGallery.Core/Features/FeatureFlagClientExtensions.cs

@@ -1,7 +1,6 @@
 // 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 NuGet.Services.Entities;
 using NuGet.Services.FeatureFlags;
 
@@ -15,12 +14,12 @@ public static bool IsEnabled(
             User user,
             bool defaultValue)
         {
-            if (user == null)
-            {
-                throw new ArgumentNullException(nameof(user));
-            }
+            // The user object is null if the user isn't logged in.
+            var flightUser = (user != null)
+                ? new FlightUser(user)
+                : null;
 
-            return client.IsEnabled(flight, new FlightUser(user), defaultValue);
+            return client.IsEnabled(flight, flightUser, defaultValue);
         }
 
         private class FlightUser : IFlightUser

src/NuGetGallery.Core/NuGetGallery.Core.csproj

@@ -219,19 +219,19 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="NuGet.Services.Entities">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.FeatureFlags">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Messaging.Email">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Validation">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Validation.Issues">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.StrongName.AnglicanGeek.MarkdownMailer">
       <Version>1.2.0</Version>

src/NuGetGallery/NuGetGallery.csproj

@@ -2124,7 +2124,7 @@
       <Version>2.2.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Licenses">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.StrongName.AnglicanGeek.MarkdownMailer">
       <Version>1.2.0</Version>
@@ -2348,16 +2348,16 @@
       <Version>5.0.0-preview1.5665</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.KeyVault">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Logging">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Owin">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Sql">
-      <Version>2.44.0</Version>
+      <Version>2.46.0</Version>
     </PackageReference>
     <PackageReference Include="Owin">
       <Version>1.0.0</Version>

tests/NuGetGallery.Core.Facts/Features/FeatureFlagClientExtensionsFacts.cs

@@ -24,6 +24,45 @@ public void ConvertsUser()
                 Roles = new List<Role>()
             };
 
+            // Act
+            FeatureFlagClientExtensions.IsEnabled(client.Object, "flight", user, defaultValue: true);
+
+            // Assert
+            client.Verify(
+                c => c.IsEnabled(
+                    "flight",
+                    It.Is<IFlightUser>(u =>
+                        u.Username == "a" &&
+                        u.EmailAddress == "[email protected]" &&
+                        u.IsSiteAdmin == false),
+                    true));
+        }
+
+        [Fact]
+        public void ConvertsAnonymousUser()
+        {
+            // Arrange - anonymous users are represented as a null user object
+            var client = new Mock<IFeatureFlagClient>();
+
+            User user = null;
+
+            // Act
+            FeatureFlagClientExtensions.IsEnabled(client.Object, "flight", user, defaultValue: true);
+
+            // Assert
+            client.Verify(
+                c => c.IsEnabled(
+                    "flight",
+                    It.Is<IFlightUser>(u => u == null),
+                    true));
+        }
+
+        [Fact]
+        public void ConvertsAdmins()
+        {
+            // Arrange
+            var client = new Mock<IFeatureFlagClient>();
+
             var admin = new User
             {
                 Username = "b",
@@ -35,22 +74,12 @@ public void ConvertsUser()
             };
 
             // Act
-            FeatureFlagClientExtensions.IsEnabled(client.Object, "flightA", user, defaultValue: true);
-            FeatureFlagClientExtensions.IsEnabled(client.Object, "flightB", admin, defaultValue: true);
+            FeatureFlagClientExtensions.IsEnabled(client.Object, "flight", admin, defaultValue: true);
 
             // Assert
             client.Verify(
                 c => c.IsEnabled(
-                    "flightA",
-                    It.Is<IFlightUser>(u =>
-                        u.Username == "a" &&
-                        u.EmailAddress == "[email protected]" &&
-                        u.IsSiteAdmin == false),
-                    true));
-
-            client.Verify(
-                c => c.IsEnabled(
-                    "flightB",
+                    "flight",
                     It.Is<IFlightUser>(u =>
                         u.Username == "b" &&
                         u.EmailAddress == "[email protected]" &&