add feature flag for banner

src/GitHubVulnerabilities2Db/Fakes/FakeFeatureFlagService.cs

@@ -55,6 +55,11 @@ public bool IsDeletePackageApiEnabled(User user)
             throw new NotImplementedException();
         }
 
+        public bool IsDisplayBannerEnabled()
+        {
+            throw new NotImplementedException();
+        }
+
         public bool IsDisplayFuGetLinksEnabled()
         {
             throw new NotImplementedException();

src/NuGetGallery.Services/Configuration/FeatureFlagService.cs

@@ -47,6 +47,7 @@ public class FeatureFlagService : IFeatureFlagService
         private const string MarkdigMdRenderingFlightName = GalleryPrefix + "MarkdigMdRendering";
         private const string DeletePackageApiFlightName = GalleryPrefix + "DeletePackageApi";
         private const string ImageAllowlistFlightName = GalleryPrefix + "ImageAllowlist";
+        private const string DisplayBannerFlightName = GalleryPrefix + "Banner";
 
         private const string ODataV1GetAllNonHijackedFeatureName = GalleryPrefix + "ODataV1GetAllNonHijacked";
         private const string ODataV1GetAllCountNonHijackedFeatureName = GalleryPrefix + "ODataV1GetAllCountNonHijacked";
@@ -326,5 +327,10 @@ public bool IsImageAllowlistEnabled()
         {
             return _client.IsEnabled(ImageAllowlistFlightName, defaultValue: false);
         }
+
+        public bool IsDisplayBannerEnabled()
+        {
+            return _client.IsEnabled(DisplayBannerFlightName, defaultValue: false);
+        }
     }
 }

src/NuGetGallery.Services/Configuration/IFeatureFlagService.cs

@@ -260,5 +260,10 @@ public interface IFeatureFlagService
         /// Whether the allowlist is enabled for checking the image sources
         /// </summary>
         bool IsImageAllowlistEnabled();
+
+        /// <summary>
+        /// Whether or not display the banner on nuget.org
+        /// </summary>
+        bool IsDisplayBannerEnabled();
     }
 }

src/NuGetGallery/Controllers/PagesController.cs

@@ -122,8 +122,9 @@ public virtual ActionResult Home()
             var externalIdentityList = ClaimsExtensions.GetExternalCredentialIdentityList(identity);
             var showEnable2FAModal = _featureFlagService.IsShowEnable2FADialogEnabled();
             var getFeedbackOnModalDismiss = _featureFlagService.IsGet2FADismissFeedbackEnabled();
+            var displayBanner = _featureFlagService.IsDisplayBannerEnabled();
 
-            return View(new GalleryHomeViewModel(showTransformModal, transformIntoOrganization, showEnable2FAModal, getFeedbackOnModalDismiss, externalIdentityList));
+            return View(new GalleryHomeViewModel(showTransformModal, transformIntoOrganization, showEnable2FAModal, getFeedbackOnModalDismiss, displayBanner, externalIdentityList));
         }
 
         [HttpGet]

src/NuGetGallery/ViewModels/GalleryHomeViewModel.cs

@@ -15,11 +15,14 @@ public class GalleryHomeViewModel
 
         public bool GetFeedbackOnModalDismissFeatureEnabled { get; set; }
 
+        public bool DisplayBannerFeatureEnabled { get; set; }
+
         public GalleryHomeViewModel() : this(
             showTransformModal: false,
             transformIntoOrganization: false,
             showEnable2FAModalFeatureEnabled: false,
             getFeedbackOnModalDismiss: false,
+            displayBanner: false,
             identity: null)
         { }
 
@@ -28,12 +31,14 @@ public GalleryHomeViewModel(
             bool transformIntoOrganization,
             bool showEnable2FAModalFeatureEnabled,
             bool getFeedbackOnModalDismiss,
+            bool displayBanner,
             string identity = null)
         {
             ShowTransformModal = showTransformModal;
             TransformIntoOrganization = transformIntoOrganization;
             ShowEnable2FAModalFeatureEnabled = showEnable2FAModalFeatureEnabled;
             GetFeedbackOnModalDismissFeatureEnabled = getFeedbackOnModalDismiss;
+            DisplayBannerFeatureEnabled = displayBanner;
             Identity = identity;
         }
     }

src/NuGetGallery/Views/Pages/Home.cshtml

@@ -4,6 +4,7 @@
     ViewBag.ShowSearchInNavbar = false;
     ViewBag.AutofocusSearch = true;
     ViewBag.HasJumbotron = true;
+    ViewBag.DisplayBanner = Model.DisplayBannerFeatureEnabled;
     var AskUserToEnable2FA = TempData.ContainsKey("AskUserToEnable2FA")
         && Convert.ToBoolean(TempData["AskUserToEnable2FA"].ToString())
         && Model.ShowEnable2FAModalFeatureEnabled;

src/NuGetGallery/Views/Shared/Gallery/Header.cshtml

@@ -22,15 +22,18 @@
     </div>
 }
 
-<div class="container-fluid banner banner-info text-center">
-    <div class="row">
-        <div class="col-sm-12">
-            <span>
-                &#128075; What do you think about NuGet.org? We're looking for feedback from developers like you. <a href="https://aka.ms/NuGetSurvey" target="_blank">Take the survey.</a>
-            </span>
+@if (ViewBag.DisplayBanner == true)
+{
+    <div class="container-fluid banner banner-info text-center">
+        <div class="row">
+            <div class="col-sm-12">
+                <span>
+                    &#128075; What do you think about NuGet.org? We're looking for feedback from developers like you. <a href="https://aka.ms/NuGetSurvey" target="_blank">Take the survey.</a>
+                </span>
+            </div>
         </div>
     </div>
-</div>
+}
 
 @helper DisplayNavigationItem(string tab, string url, bool bold = false, string title = null)
 {

src/VerifyMicrosoftPackage/Fakes/FakeFeatureFlagService.cs

@@ -106,5 +106,7 @@ public class FakeFeatureFlagService : IFeatureFlagService
         public bool IsDeletePackageApiEnabled(User user) => throw new NotImplementedException();
 
         public bool IsImageAllowlistEnabled() => throw new NotImplementedException();
+
+        public bool IsDisplayBannerEnabled() => throw new NotImplementedException();
     }
 }