Azure storage SAS failed to authenticate - azure-storage

Question

Hi I am trying to create SAS token for my file on Azure. I am getting "Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature" error. Following is my code.
public async Task<IActionResult> TestBlobClient()
{
try
{
string storageAccount = "myaccount";
string password = "mykey";
var sharedKeyCredential = new StorageSharedKeyCredential(storageAccount, password);
var shareClient = new ShareClient(new Uri("https://aaa.file.core.windows.net/zttsox20201027154501"), sharedKeyCredential);
ShareDirectoryClient directory = shareClient.GetDirectoryClient("Output/14");
ShareFileClient file = directory.GetFileClient("637655759841727494_main.wav");
var shareSasBuilder = new ShareSasBuilder
{
ShareName = "aaa",
Protocol = SasProtocol.None,
ExpiresOn = DateTime.UtcNow.AddYears(50),
Resource = "b"
};
shareSasBuilder.SetPermissions(ShareFileSasPermissions.Read);
var url = new Uri(file.Uri + "?" + shareSasBuilder.ToSasQueryParameters(sharedKeyCredential).ToString());
return Ok(url);
}
catch (Exception ex)
{
return StatusCode(StatusCodes.Status400BadRequest, ex.Message);
}

Answer 1

The issue is with Resource = "b". When you set the resource as b, that means you are getting a SAS token for a blob. Considering you're getting a SAS token for a file share, the value of this parameter should be s.
Please try something like:
var shareSasBuilder = new ShareSasBuilder
{
ShareName = "zttsox20201027154501",
Protocol = SasProtocol.None,
ExpiresOn = DateTime.UtcNow.AddYears(50),
Resource = "s"
};
For more details, please see this link: https://learn.microsoft.com/en-us/dotnet/api/azure.storage.sas.sharesasbuilder.resource?view=azure-dotnet#Azure_Storage_Sas_ShareSasBuilder_Resource.