Azure-storage-azcopy: Add key support

[brettrowberry]

Which version of the AzCopy was used?

10.0.4-Preview

Which platform are you using? (ex: Windows, Mac, Linux)

Windows

What command did you run?

copy

What problem was encountered?

This newer (and awesome) AzCopy allows SAS tokens and OAuth for authentication. The old AzCopy also allowed keys. Can we add key support? This makes it easier for people outside of your tenant to upload files.

How can we reproduce the problem in the simplest way?

Have you found a mitigation/solution?

No

[amsword]

Hopefully the key support could be added!

[MateuszBogdan]

Also for storage emulator this is important

[zezha-msft]

Hi @brettrowberry @amsword @MateuszBogdan, thanks for reaching out!

Initially, we didn't implement Shared Key authentication because of security concerns; passing around account credentials that have admin privileges is really not a good idea in general, especially when a lot of users leverage AzCopy for scripting purposes. In addition, this form of authentication is not performant, as it requires a certain amount of computation for every request.

Nevertheless, I see that there's still a need for Shared Key in some scenarios, as @MateuszBogdan has suggested. I'll bring up your suggestion with the Team. Thank you!

[brettrowberry]

After doing a lot of testing with SAS tokens, I don't think keys are actually necessary. I agree that they are a security concern. I would actually prefer this not be implemented.