Azure blob storage SAS
How to grant temporary privileges to download one blob in Azure blob storage via a SAS, that has a duration equivalent to the period of time the download will take. ie privilege will be no longer than necessary?
This isn't possible by design, you can grant a short lived SAS token (eg 1 minute) but if the client is on a slow internet connection that could be a problem. What is the problem if the client downloads the blob multiple times? sometimes a user "loses" a file and redownloads the same file. Why do you want this?
If the download is handled by an application, you could use a stored access policy , and after the client succesfully downloads the file, removes the policy so the SAS is revoked: https://azure.microsoft.com/nl-nl/documentation/articles/storage-dotnet-shared-access-signature-part-1/
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