Guide on Generating SAS Token for Azure Table Storage in a jQuery Application

I am currently working on a jQuery web application that requires read-only access to an Azure Table Storage, fetching one record at a time by passing in the PartitionKey and RowKey. To simplify my code, I have integrated the Azure Storage JavaScript Client Library which can be found here.

My main challenge lies in creating a SAS_TOKEN to authenticate my access to the Azure Table. Despite searching for JavaScript examples on how to achieve this, I have yet to find a suitable solution. The only crucial aspect for me is setting the expiry time to 2 minutes.

It appears that the Azure Storage JS library offers a NodeJS function for generating the SAS token, but I am uncertain about how to utilize this within my jQuery code. Additionally, I have been unable to locate a pure JavaScript example illustrating the process of piecing together the required components to form the SAS token.

For reference, I have been using this documentation from Azure related to table storage: Sample Table Storage Documentation

javascriptazureaccess-token

Answer №1

There is a NodeJS function in the Azure Storage JS library that can accomplish this task, but I am unsure how to utilize it with jQuery code. Unfortunately, I have not been able to find a pure JavaScript example that demonstrates how to piece together the components needed to create the SAS token.

The general recommendation strongly advises against creating a SAS token on the client side. This is because in order to generate a SAS token, one would require an account key. By generating the SAS token on the client side, you are essentially exposing your account key to users who could potentially view the source code and access this sensitive information. Anyone with an account key effectively becomes an administrator of that storage account.

A safer approach would be to have a server-side endpoint within your application responsible for generating the SAS token. From the client side, you could initiate an AJAX request (using $.ajax) to this endpoint to retrieve the SAS token. Alternatively, you could generate the SAS token on the server side and pass it as a parameter to the client side. Implementing this method ensures that your account key remains protected.

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