Set the CacheControl property on packages blobs (#6297)

This sets the `CacheControl` property on all packages blobs to 2 minutes. 

Fixes #6285

Author: loic-sharma

src/NuGetGallery.Core/CoreConstants.cs

@@ -23,6 +23,8 @@ public static class CoreConstants
         public const string CertificateContentType = "application/pkix-cert";
         public const string JsonContentType = "application/json";
 
+        public const string DefaultCacheControl = "max-age=120";
+
         public const string UserCertificatesFolderName = "user-certificates";
         public const string ContentFolderName = "content";
         public const string DownloadsFolderName = "downloads";

src/NuGetGallery.Core/Services/CloudBlobCoreFileStorageService.cs

@@ -318,6 +318,7 @@ public async Task SaveFileAsync(string folderName, string fileName, Stream file,
             }
 
             blob.Properties.ContentType = GetContentType(folderName);
+            blob.Properties.CacheControl = GetCacheControl(folderName);
             await blob.SetPropertiesAsync();
         }
 
@@ -549,6 +550,7 @@ private static string GetContentType(string folderName)
                 case CoreConstants.PackageReadMesFolderName:
                     return CoreConstants.TextContentType;
 
+                case CoreConstants.ContentFolderName:
                 case CoreConstants.RevalidationFolderName:
                 case CoreConstants.StatusFolderName:
                     return CoreConstants.JsonContentType;
@@ -562,6 +564,32 @@ private static string GetContentType(string folderName)
             }
         }
 
+        private static string GetCacheControl(string folderName)
+        {
+            switch (folderName)
+            {
+                case CoreConstants.PackagesFolderName:
+                    return CoreConstants.DefaultCacheControl;
+
+                case CoreConstants.PackageBackupsFolderName:
+                case CoreConstants.UploadsFolderName:
+                case CoreConstants.ValidationFolderName:
+                case CoreConstants.SymbolPackagesFolderName:
+                case CoreConstants.SymbolPackageBackupsFolderName:
+                case CoreConstants.DownloadsFolderName:
+                case CoreConstants.PackageReadMesFolderName:
+                case CoreConstants.ContentFolderName:
+                case CoreConstants.RevalidationFolderName:
+                case CoreConstants.StatusFolderName:
+                case CoreConstants.UserCertificatesFolderName:
+                    return null;
+
+                default:
+                    throw new InvalidOperationException(
+                        String.Format(CultureInfo.CurrentCulture, "The folder name {0} is not supported.", folderName));
+            }
+        }
+
         private async Task<ICloudBlobContainer> PrepareContainer(string folderName, bool isPublic)
         {
             var container = _client.GetContainerReference(folderName);

tests/NuGetGallery.Core.Facts/Services/CloudBlobCoreFileStorageServiceFacts.cs

@@ -48,7 +48,7 @@ public override IEnumerable<object[]> GetData(MethodInfo testMethod)
             {
                 var folderNames = new List<object[]>
                 {
-                    new object[] { CoreConstants.ContentFolderName, false, null, },
+                    new object[] { CoreConstants.ContentFolderName, false, CoreConstants.JsonContentType, },
                     new object[] { CoreConstants.DownloadsFolderName, true, CoreConstants.OctetStreamContentType },
                     new object[] { CoreConstants.PackageBackupsFolderName, true, CoreConstants.PackageContentType },
                     new object[] { CoreConstants.PackageReadMesFolderName, false, CoreConstants.TextContentType },
@@ -73,7 +73,6 @@ public override IEnumerable<object[]> GetData(MethodInfo testMethod)
                 else if (!IncludePermissions && IncludeContentTypes)
                 {
                     folderNames = folderNames
-                        .Where(fn => fn[2] != null)
                         .Select(fn => new[] { fn[0], fn[2] })
                         .ToList();
                 }
@@ -512,6 +511,41 @@ public async Task WillSetTheBlobContentType(string folderName, string contentTyp
                 Assert.Equal(contentType, fakeBlob.Object.Properties.ContentType);
                 fakeBlob.Verify(x => x.SetPropertiesAsync());
             }
+
+            [Theory]
+            [FolderNamesData]
+            public async Task WillSetTheBlobControlCacheOnPackagesFolder(string folderName)
+            {
+                var fakeBlobClient = new Mock<ICloudBlobClient>();
+                var fakeBlobContainer = new Mock<ICloudBlobContainer>();
+                fakeBlobContainer.Setup(x => x.CreateIfNotExistAsync()).Returns(Task.FromResult(0));
+                fakeBlobContainer.Setup(x => x.SetPermissionsAsync(It.IsAny<BlobContainerPermissions>())).Returns(Task.FromResult(0));
+                var fakeBlob = new Mock<ISimpleCloudBlob>();
+                fakeBlobClient.Setup(x => x.GetContainerReference(It.IsAny<string>())).Returns(fakeBlobContainer.Object);
+                fakeBlobContainer.Setup(x => x.GetBlobReference(It.IsAny<string>())).Returns(fakeBlob.Object);
+                fakeBlob.Setup(x => x.Properties).Returns(new BlobProperties());
+                fakeBlob.Setup(x => x.Uri).Returns(new Uri("http://theUri"));
+                fakeBlob.Setup(x => x.DeleteIfExistsAsync()).Returns(Task.FromResult(0));
+                fakeBlob.Setup(x => x.SetPropertiesAsync()).Returns(Task.FromResult(0));
+                var service = CreateService(fakeBlobClient: fakeBlobClient);
+                var fakePackageFile = new MemoryStream();
+                fakeBlob.Setup(x => x.UploadFromStreamAsync(fakePackageFile, true)).Returns(Task.FromResult(0)).Verifiable();
+
+                await service.SaveFileAsync(folderName, "theFileName", fakePackageFile);
+
+                fakeBlob.Verify();
+
+                if (folderName == CoreConstants.PackagesFolderName)
+                {
+                    Assert.Equal(CoreConstants.DefaultCacheControl, fakeBlob.Object.Properties.CacheControl);
+                }
+                else
+                {
+                    Assert.Null(fakeBlob.Object.Properties.CacheControl);
+                }
+
+                fakeBlob.Verify(x => x.SetPropertiesAsync());
+            }
         }
 
         public class TheSaveFileWithAccessConditionMethod