Spaces API Errors

I’m trying to make my own Spaces API client and I’m hitting some snags.

I’m trying to access spaces API without having to use AWS SDK as that thing is a beast and I’m aiming to do something much lighter and PHP 7 compatible.

I’m loosely (since it’s meant for AWS) following this code example of creating a AWS version 4 signature and I keep getting the error, InvalidArgument, that’s not very helpful. Looking up the error on SO, it seems that AWS at least shows an actual error message as well to help guide you to what you are doing wrong, but spaces is lacking that so I’m now out in the cold and lost.

I’m hoping someone can give me some pointers on what I’m doing wrong. I’d like to have a nice way to upload files from my web admin portal and not have to log into DO to do my uploading.

Thanks