Google storage signature issue

[alextur]

minio-go/api.go

Line 158 in 5b15988

// Google cloud storage should be set to signature V2, force it if not.

All requsts to Google Storage lead to signature error:
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.

As of September 2020, Google Cloud Storage only supports request signing using version 4 of the Signature Version.

[sprat]

I've double-checked today by modifying the override line in the minio.New method which forces a V2 signature for Google endpoints and it seems that both V2 and V4 signatures are working properly: I can perform a bucket listing in both cases. I would suggest removing the special case in the code since V4 signatures are better. But I must admit that I don't understand all the uses of the overrideSignerType field in the code, so I'm reluctant to file a pull request for that.