Add fuget.org links to packages

src/NuGetGallery.Services/Configuration/FeatureFlagService.cs

@@ -26,6 +26,7 @@ public class FeatureFlagService : IFeatureFlagService
         private const string ManageDeprecationForManyVersionsFeatureName = GalleryPrefix + "ManageDeprecationMany";
         private const string ManageDeprecationApiFeatureName = GalleryPrefix + "ManageDeprecationApi";
         private const string DisplayVulnerabilitiesFeatureName = GalleryPrefix + "DisplayVulnerabilities";
+        private const string DisplayFuGetLinksFeatureName = GalleryPrefix + "DisplayFuGetLinks";
         private const string ODataReadOnlyDatabaseFeatureName = GalleryPrefix + "ODataReadOnlyDatabase";
         private const string PackagesAtomFeedFeatureName = GalleryPrefix + "PackagesAtomFeed";
         private const string SearchSideBySideFlightName = GalleryPrefix + "SearchSideBySide";
@@ -133,6 +134,11 @@ public bool IsDisplayVulnerabilitiesEnabled()
             return _client.IsEnabled(DisplayVulnerabilitiesFeatureName, defaultValue: false);
         }
 
+        public bool IsDisplayFuGetLinksEnabled()
+        {
+            return _client.IsEnabled(DisplayFuGetLinksFeatureName, defaultValue: false);
+        }
+
         public bool AreEmbeddedIconsEnabled(User user)
         {
             return _client.IsEnabled(EmbeddedIconFlightName, user, defaultValue: false);

src/NuGetGallery.Services/Configuration/IFeatureFlagService.cs

@@ -61,6 +61,11 @@ public interface IFeatureFlagService
         /// </summary>
         bool IsDisplayVulnerabilitiesEnabled();
 
+        /// <summary>
+        /// Whether or not a fuget.org link is visible on a package's details page.
+        /// </summary>
+        bool IsDisplayFuGetLinksEnabled();
+
         /// <summary>
         /// Whether the user is allowed to publish packages with an embedded icon.
         /// </summary>

src/NuGetGallery/App_Data/Files/Content/flags.json

@@ -23,7 +23,8 @@
     "NuGetGallery.ODataV2FindPackagesByIdCountNonHijacked": "Enabled",
     "NuGetGallery.ODataV2SearchNonHijacked": "Enabled",
     "NuGetGallery.ODataV2SearchCountNonHijacked": "Enabled",
-    "NuGetGallery.DisplayVulnerabilities": "Enabled"
+    "NuGetGallery.DisplayVulnerabilities": "Enabled",
+    "NuGetGallery.DisplayFuGetLinks": "Enabled"
   },
   "Flights": {
     "NuGetGallery.TyposquattingFlight": {

src/NuGetGallery/Controllers/PackagesController.cs

@@ -902,6 +902,7 @@ public virtual async Task<ActionResult> DisplayPackage(string id, string version
             model.IsAtomFeedEnabled = _featureFlagService.IsPackagesAtomFeedEnabled();
             model.IsPackageDeprecationEnabled = _featureFlagService.IsManageDeprecationEnabled(currentUser, allVersions);
             model.IsPackageVulnerabilitiesEnabled = _featureFlagService.IsDisplayVulnerabilitiesEnabled();
+            model.IsFuGetLinksEnabled = _featureFlagService.IsDisplayFuGetLinksEnabled();
             model.IsPackageRenamesEnabled = _featureFlagService.IsPackageRenamesEnabled(currentUser);
             model.IsPackageDependentsEnabled = _featureFlagService.IsPackageDependentsEnabled(currentUser);
 

src/NuGetGallery/Helpers/ViewModelExtensions/DisplayPackageViewModelFactory.cs

@@ -163,6 +163,12 @@ private DisplayPackageViewModel SetupCommon(
                 viewModel.ProjectUrl = projectUrl;
             }
 
+            var fugetUrl = $"https://www.fuget.org/packages/{package.Id}/{package.NormalizedVersion}";
+            if (PackageHelper.TryPrepareUrlForRendering(fugetUrl, out string fugetReadyUrl))
+            {
+                viewModel.FuGetUrl = fugetReadyUrl;
+            }
+
             viewModel.EmbeddedLicenseType = package.EmbeddedLicenseType;
             viewModel.LicenseExpression = package.LicenseExpression;
 

src/NuGetGallery/ViewModels/DisplayPackageViewModel.cs

@@ -34,6 +34,7 @@ public class DisplayPackageViewModel : ListPackageItemViewModel
         public bool IsAtomFeedEnabled { get; set; }
         public bool IsPackageDeprecationEnabled { get; set; }
         public bool IsPackageVulnerabilitiesEnabled { get; set; }
+        public bool IsFuGetLinksEnabled { get; set; }
         public bool IsPackageRenamesEnabled { get; set; }
         public bool IsGitHubUsageEnabled { get; set; }
         public bool IsPackageDependentsEnabled { get; set; }
@@ -77,6 +78,7 @@ public bool HasNewerRelease
         public RepositoryKind RepositoryType { get; private set; }
         public string ProjectUrl { get; set; }
         public string LicenseUrl { get; set; }
+        public string FuGetUrl { get; set; }
         public IReadOnlyCollection<string> LicenseNames { get; set; }
         public string LicenseExpression { get; set; }
         public IReadOnlyCollection<CompositeLicenseExpressionSegment> LicenseExpressionSegments { get; set; }

src/NuGetGallery/Views/Packages/DisplayPackage.cshtml

@@ -1029,7 +1029,24 @@
                         <a href="@Url.ViewValidations(Model)">View validations</a>
                     </li>
                 }
-            </ul>
+
+                @if (Model.IsFuGetLinksEnabled && !string.IsNullOrEmpty(Model.FuGetUrl))
+                {
+                    var disclaimer = "fuget.org is a 3rd party website, not controlled by Microsoft. This link is made available to you per the NuGet Terms of Use.";
+
+                    <li>
+                        <img class="icon"
+                             aria-label="@disclaimer" title="@disclaimer"
+                             src="@Url.Absolute("~/Content/gallery/img/fuget.svg")"
+                             @ViewHelpers.ImageFallback(Url.Absolute("~/Content/gallery/img/fuget-32x32.png")) />
+                        <a href="@Model.FuGetUrl" data-track="outbound-repository-url"
+                           aria-label="open in fuget.org explorer"
+                           title="Explore additional package info on fuget.org" rel="nofollow" target="_blank">
+                            Open in FuGet Package Explorer
+                        </a>
+                    </li>
+                }
+                </ul>
             @if (Model.LicenseNames.AnySafe())
             {
                 <p>License info provided by <a href="http://sonatype.com/">Sonatype</a>.</p>

tests/NuGetGallery.Facts/ViewModels/DisplayPackageViewModelFacts.cs

@@ -104,6 +104,27 @@ public void ItInitializesProjectUrl(string projectUrl, string expected)
             Assert.Equal(expected, model.ProjectUrl);
         }
 
+        [Theory]
+        [InlineData("foo", "1.0.0", "https://www.fuget.org/packages/foo/1.0.0")]
+        [InlineData("foo", "1.1.0", "https://www.fuget.org/packages/foo/1.1.0")]
+        [InlineData("Foo.Bar", "1.1.0-bETa", "https://www.fuget.org/packages/Foo.Bar/1.1.0-bETa")]
+        public void ItInitializesFuGetUrl(string packageId, string packageVersion, string expected)
+        {
+            var package = new Package
+            {
+                Version = packageVersion,
+                NormalizedVersion = packageVersion,
+                PackageRegistration = new PackageRegistration
+                {
+                    Id = packageId,
+                    Owners = Enumerable.Empty<User>().ToList(),
+                    Packages = Enumerable.Empty<Package>().ToList()
+                }
+            };
+
+            var model = CreateDisplayPackageViewModel(package, currentUser: null, packageKeyToDeprecation: null, readmeHtml: null);
+            Assert.Equal(expected, model.FuGetUrl);
+        }
 
         [Theory]
         [InlineData(null, null)]