Generate SAS token c# programmatically

Question

I have copied a file 1.txt from Container A to Container B.

I am also able to get the complete URL of the copied file and also able to open it in the same browser tab as long as container is public.

Now I am making my container private .. I was hoping there was a simple API which could give me SAS URL & TOKEN on the spot .

Is there any such API ?

score 21 · Accepted Answer · answered Jun 27 '20 at 02:04

21

Please try this code:

        Azure.Storage.Sas.BlobSasBuilder blobSasBuilder = new Azure.Storage.Sas.BlobSasBuilder()
        {
            BlobContainerName = "demo-copy",
            BlobName = "test.txt",
            ExpiresOn = DateTime.UtcNow.AddMinutes(5),//Let SAS token expire after 5 minutes.
        };
        blobSasBuilder.SetPermissions(Azure.Storage.Sas.BlobSasPermissions.Read);//User will only be able to read the blob and it's properties
        var sasToken = blobSasBuilder.ToSasQueryParameters(new StorageSharedKeyCredential(accountName, accountKey)).ToString();
        var sasUrl = blobClient.Uri.AbsoluteUri + "?" + sasToken;

Basically you need to make use of BlobSasBuilder class.

answered Jun 27 '20 at 02:04

Gaurav Mantri

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Thank you Gaurav .. You are an awesome rock-star! – ecstasy Jun 27 '20 at 02:20
1

:). Glad to be of help! – Gaurav Mantri Jun 27 '20 at 02:21
Gaurav .. this SAS url is @ container level ..How can we have SAS token @ file level inside container ? – ecstasy Jul 01 '20 at 14:22
1

Nope. This SAS token is for `test.txt` blob in `demo-copy` container. – Gaurav Mantri Jul 01 '20 at 14:37
if i have 2 files .. a.txt & b.txt .. with token from a.txt .. i am able to open b.txt .. – ecstasy Jul 01 '20 at 14:38
i went into portal .. there when manually generating SAS token .. i noticed they are unique for each file .. – ecstasy Jul 01 '20 at 14:40
1

you are right Gaurav .. i did a massive boo-boo .. i deleted line BlobName = "test.txt", .. my bad .. sorry bud .. learned something new today :) – ecstasy Jul 01 '20 at 14:41
1

Yes, if you don't include the `BlobName` parameter the SAS token will be generated for container and thus will be applicable to all blobs in that container. – Gaurav Mantri Jul 01 '20 at 14:50
understood .. please guide .. https://stackoverflow.com/questions/62679573/merge-2-functions-azure – ecstasy Jul 01 '20 at 14:52
hi Gaurav .. please help .. https://stackoverflow.com/questions/62783629/generate-azure-functions-access-code-on-the-fly-programmatically – ecstasy Jul 08 '20 at 00:43
Took me a while to figure out my SDK was out of date. This version or later supports all the features in this answer: – IdusOrtus May 27 '21 at 18:17

Generate SAS token c# programmatically

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