Jeremy Jeremy - 5 months ago 44
C# Question

Azure Copy blob to different premium storage account

I'm trying to copy one blob, specifically a vhd, from on storage account to another storage account. The app that I am writing has owner access to both storage accounts and can run other operation on these storage accounts. The vhd does not have a lease on it (not attached a VM). I have the following code but get a 403 forbidden response.

StorageCredentials scSource = new StorageCredentials(SourceStorageName, strSourceStorageKey);
StorageCredentials scTarget = new StorageCredentials(TargetStorageName, strTargetStorageKey);
CloudStorageAccount csaSource = new CloudStorageAccount(scSource, true);
CloudStorageAccount csaTarget = new CloudStorageAccount(scTarget, true);
CloudBlobClient cbcSource = csaSource.CreateCloudBlobClient();
CloudBlobClient cbcTarget = csaTarget.CreateCloudBlobClient();
CloudBlobContainer bcSource = cbcSource.GetContainerReference(SourceContainer);
CloudBlobContainer bcTarget = cbcTarget.GetContainerReference(TargetContainer);
CloudBlob cbSource = bcSource.GetBlobReference(strSourceDiskName);
CloudBlob cbTarget = bcTarget.GetBlobReference(strTargetDiskName);
Task<string> tskCopy = cbTarget.StartCopyAsync(cbSource.Uri);
while (tskCopy.Status != TaskStatus.RanToCompletion)
if (tskCopy.Exception != null)
throw tskCopy.Exception;

Not sure why this is happening because I am able to copy a blob from one storage account to another via other tools (cloud berry etc).



Kudos to Gaurav Mantri for pointing me in the right direction. After looking up Shared Access Signature I came upon this article from Microsoft

This code to be specific:

    SharedAccessBlobPolicy sasConstraints = new SharedAccessBlobPolicy();
    sasConstraints.SharedAccessStartTime = DateTime.UtcNow.AddMinutes(-5);
    sasConstraints.SharedAccessExpiryTime = DateTime.UtcNow.AddHours(24);
    sasConstraints.Permissions = SharedAccessBlobPermissions.Read | SharedAccessBlobPermissions.Write;

    //Generate the shared access signature on the blob, setting the constraints directly on the signature.
    string sasBlobToken = blob.GetSharedAccessSignature(sasConstraints);

    //Return the URI string for the container, including the SAS token.
    return blob.Uri + sasBlobToken;