[Storage] Fix issue of getting a single blob with leading slashes (#21754)

* fix slash issue for getting a single blob

* remove breaking change warning

Author: yifanz7

src/Storage/Storage.Management/ChangeLog.md

@@ -18,6 +18,8 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Fixed issue of getting a single blob with leading slashes
+    - `Get-AzStorageBlob`
 * Supported setting CORS rules in management plane cmdlets 
     - `Update-AzStorageBlobServiceProperty`
     - `Update-AzStorageFileServiceProperty`

src/Storage/Storage/Blob/Cmdlet/GetAzureStorageBlob.cs

@@ -57,7 +57,6 @@ public class GetAzureStorageBlobCommand : StorageCloudBlobCmdletBase
         /// </summary>
         private const string SingleBlobVersionIDParameterSet = "SingleBlobVersionID";
 
-        [CmdletParameterBreakingChange("Blob", ChangeDescription = "Leading and trailing slashes will not be trimmed in a future release.")]
         [Parameter(Position = 0, HelpMessage = "Blob name", ParameterSetName = NameParameterSet)]
         [Parameter(Position = 0, Mandatory = true, HelpMessage = "Blob name", ParameterSetName = SingleBlobSnapshotTimeParameterSet)]
         [Parameter(Position = 0, Mandatory = true, HelpMessage = "Blob name", ParameterSetName = SingleBlobVersionIDParameterSet)]
@@ -235,7 +234,7 @@ internal async Task ListBlobsByName(long taskId, IStorageBlobManagement localCha
                 BlobBaseClient blobClient = null;
                 if (UseTrack2Sdk()) // User Track2 SDK
                 {
-                    blobClient = Util.GetTrack2BlobClient(track2container, blobName, localChannel.StorageContext, this.VersionId, false, this.SnapshotTime is null ? null : this.SnapshotTime.Value.ToUniversalTime().ToString("o").Replace("+00:00", "Z"), ClientOptions);
+                    blobClient = Util.GetTrack2BlobClient(track2container, blobName, localChannel.StorageContext, this.VersionId, false, this.SnapshotTime is null ? null : this.SnapshotTime.Value.ToUniversalTime().ToString("o").Replace("+00:00", "Z"), ClientOptions, shouldTrimSlash: false);
                     global::Azure.Storage.Blobs.Models.BlobProperties blobProperties;
                     try
                     {
@@ -245,7 +244,7 @@ internal async Task ListBlobsByName(long taskId, IStorageBlobManagement localCha
                     {
                         throw new ResourceNotFoundException(String.Format(Resources.BlobNotFound, blobName, containerName));
                     }
-                    blobClient = Util.GetTrack2BlobClient(track2container, blobName, localChannel.StorageContext, this.VersionId, blobProperties.IsLatestVersion, this.SnapshotTime is null ? null : this.SnapshotTime.Value.ToUniversalTime().ToString("o").Replace("+00:00", "Z"), ClientOptions, blobProperties.BlobType);
+                    blobClient = Util.GetTrack2BlobClient(track2container, blobName, localChannel.StorageContext, this.VersionId, blobProperties.IsLatestVersion, this.SnapshotTime is null ? null : this.SnapshotTime.Value.ToUniversalTime().ToString("o").Replace("+00:00", "Z"), ClientOptions, blobProperties.BlobType, shouldTrimSlash: false);
 
                     AzureStorageBlob outputBlob = new AzureStorageBlob(blobClient, localChannel.StorageContext, blobProperties, ClientOptions);
                     if (this.IncludeTag.IsPresent)

src/Storage/Storage/Common/Util.cs

@@ -415,6 +415,14 @@ public static BlobBaseClient GetTrack2BlobClient(BlobContainerClient track2conta
             {
                 blobUriBuilder.Snapshot = snapshot;
             }
+            if (shouldTrimSlash == false)
+            {
+                if (options == null)
+                {
+                    options = new BlobClientOptions();
+                }
+                options.TrimBlobNameSlashes = shouldTrimSlash;
+            }
 
             return GetTrack2BlobClient(blobUriBuilder.ToUri(), context, options, blobType);
         }