Download not working for private Blob-Container

[AndiHahn]

Download of single files uses a WebClient for downloading the file.
If the Azure Blob Storage Container is not set to public access, this will result in a Status 404 (Resource not found).

FileStreamResult fileStreamResult = new FileStreamResult(new MemoryStream(new WebClient().DownloadData(this.filesPath + selectedItems[0].FilterPath + names[0])), "APPLICATION/octet-stream"); fileStreamResult.FileDownloadName = file.Name; return fileStreamResult;

To support private Blob Container's aswell, the Azure Blob Storage library should be used to download the file's.

[thirukumaran-murugan]

Hi Andreas,

Greetings from Syncfusion support.

We have validated your reported query in the File Manager component. Please find the details below.

We have validated your reported query in private Azure blob storage. To overcome the reported scenario, you need to generate a SAS token. If the access level is private, an URL would require a SAS token to retrieve a blob in the container. For your reference, we have shared a code snippet to achieve your requirement.

 
//The policy name must be unique 
var policyName = "testpliy" + Guid.NewGuid().ToString(); 
// create the URI, append the SAS Url that is generated in your blob. 
System.Uri uri = new System.Uri(container.Uri + "Blob SAS Url"); 
CloudBlobContainer cloudBlobContainer = new CloudBlobContainer(uri); 
foreach (FileManagerDirectoryContent file in selectedItems) 
       { 
            if (file.IsFile && selectedItems.Count() == 1) 
            { 
                    CloudBlockBlob blockBlob = cloudBlobContainer.GetBlockBlobReference(this.rootPath+ "\\" +file.Name); 
                    string absoluteFilePath = Path.GetTempPath() + file.Name; 
                    await CopyFileToTemp(absoluteFilePath, blockBlob); 
             } 
 

You can make use of this SAS token in the required places to achieve your requirement. Refer to the below blogs for reference.

https://docs.microsoft.com/en-us/azure/storage/blobs/sas-service-create?tabs=dotnet

https://docs.microsoft.com/en-us/azure/storage/common/storage-sas-overview

https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/tutorial-linux-vm-access-storage-sas

Please let us know if you need any further assistance.

Regards,
Thirukumaran M.

[AndiHahn]

Hi @Thirukumanaran

Thanks for your answer.
Creation of an (additional) SAS-Token is not required, as there is already an authenticated client used in the implementation, for accessing the azure storage.
For downloading files (in the 'Download' Method and in the 'GetImage' Method) the existing 'CloudBlobContainer' should be used to download the file's instead of using a 'WebClient'

Regards,
Andreas

[rsloggett-prmaconsulting]

Hi @thirukumaran-murugan. Can you please respond to the previous reply on this one (it has been open and waiting an answer for over a year now). We also spotted this issue when exploring using our Enterprise license for repository functionality also and it appears to be a pretty nasty blocker if potential users aren't using public blob storage (which I imagine would be most users). As it stands, the solution isn't usable for that scenario which is a shame as it appears to be something you might have already tackled with multi-file downloads?