Connect to Azure Batch service from browser jQuery ajax REST call

Question

I have access to an Azure batch service with the account name and base64 authentication key. A coworker wrote a batch service that retrieves files, processes them, and returns them to a specified location. These files are stored in a SharePoint library, and the batch service works fine. What we would like to do, is from the browser, setup an ajax call in jQuery/ajax to properly create the correct headers and the proper authentication information to perform this request. I have found some documentation but no real examples that work because I primarily end up with an error:

The MAC signature found in the HTTP request is not the same as any computed signature.

It displays what it uses to create a key so I thought I would do that same thing but it still doesn't work and I get the same error.

Answer 1

Glad that Batch service part is working great.

WIth regards to the error message: "The MAC signature found in the HTTP request is not the same as any computed signature." Every request made against a storage service must be authenticated, In this case its related with the Authentication for Azure Storage.

• You probably want to carefully get the url you are forming.

• Key documentation here: https://learn.microsoft.com/en-us/rest/api/storageservices/Authentication-for-the-Azure-Storage-Services?redirectedfrom=MSDN

Also, please take a look at the similar issue happened in past here:

• The MAC signature found in the HTTP request '...' is not the same as any computed signature

• C# Azure REST API : The MAC signature [...] is not the same as any computed signature

• https://social.msdn.microsoft.com/Forums/azure/en-US/ee551d65-ecd6-4e6c-9da9-a412f98b7c8b/blob-rest-authentication-examples?forum=windowsazuredata

• The MAC signature found in the HTTP request is not the same as any computed signature

Authentication for Azure Storage is not simply a matter of providing the access key (that is not very secure). You need to create a signature string that represents the given request, sign the string with the HMAC-SHA256 algorithm (using your storage key to sign), and encode the result in base 64. See https://msdn.microsoft.com/en-us/library/azure/dd179428.aspx for full details, including how to construct the signature string.