[AC-1713] [Flexible collections] Add feature flags to server (#3334)

* Add feature flags for FlexibleCollections and BulkCollectionAccess

* Flag new routes and behaviour

---------

Co-authored-by: Rui Tomé <108268980+r-tome@users.noreply.github.com>

test/Core.Test/AutoFixture/FeatureServiceFixtures.cs

@@ -0,0 +1,75 @@
+using System.Reflection;
+using AutoFixture;
+using AutoFixture.Kernel;
+using Bit.Core.Context;
+using Bit.Core.Services;
+using Bit.Test.Common.AutoFixture;
+using Bit.Test.Common.AutoFixture.Attributes;
+using NSubstitute;
+
+namespace Bit.Core.Test.AutoFixture;
+
+internal class FeatureServiceBuilder : ISpecimenBuilder
+{
+    private readonly string _enabledFeatureFlag;
+
+    public FeatureServiceBuilder(string enabledFeatureFlag)
+    {
+        _enabledFeatureFlag = enabledFeatureFlag;
+    }
+
+    public object Create(object request, ISpecimenContext context)
+    {
+        if (context == null)
+        {
+            throw new ArgumentNullException(nameof(context));
+        }
+
+        if (request is not ParameterInfo pi)
+        {
+            return new NoSpecimen();
+        }
+
+        if (pi.ParameterType == typeof(IFeatureService))
+        {
+            var fixture = new Fixture();
+            var featureService = fixture.WithAutoNSubstitutions().Create<IFeatureService>();
+            featureService
+                .IsEnabled(_enabledFeatureFlag, Arg.Any<ICurrentContext>(), Arg.Any<bool>())
+                .Returns(true);
+            return featureService;
+        }
+
+        return new NoSpecimen();
+    }
+}
+
+internal class FeatureServiceCustomization : ICustomization
+{
+    private readonly string _enabledFeatureFlag;
+
+    public FeatureServiceCustomization(string enabledFeatureFlag)
+    {
+        _enabledFeatureFlag = enabledFeatureFlag;
+    }
+
+    public void Customize(IFixture fixture)
+    {
+        fixture.Customizations.Add(new FeatureServiceBuilder(_enabledFeatureFlag));
+    }
+}
+
+/// <summary>
+/// Arranges the IFeatureService mock to enable the specified feature flag
+/// </summary>
+public class FeatureServiceCustomizeAttribute : BitCustomizeAttribute
+{
+    private readonly string _enabledFeatureFlag;
+
+    public FeatureServiceCustomizeAttribute(string enabledFeatureFlag)
+    {
+        _enabledFeatureFlag = enabledFeatureFlag;
+    }
+
+    public override ICustomization GetCustomization() => new FeatureServiceCustomization(_enabledFeatureFlag);
+}

test/Core.Test/Services/CollectionServiceTests.cs

@@ -112,6 +112,9 @@ public class CollectionServiceTest
     {
         collection.Id = default;
         sutProvider.GetDependency<IOrganizationRepository>().GetByIdAsync(organization.Id).Returns(organization);
+        sutProvider.GetDependency<IFeatureService>()
+            .IsEnabled(FeatureFlagKeys.FlexibleCollections, Arg.Any<ICurrentContext>(), Arg.Any<bool>())
+            .Returns(true);
 
         var ex = await Assert.ThrowsAsync<BadRequestException>(() => sutProvider.Sut.SaveAsync(collection, null, users));
         Assert.Contains("At least one member or group must have can manage permission.", ex.Message);