Imports golang.org/x/net/context github.com/aws/aws-sdk-go/aws/session golang.org/x/oauth2/google github.com/aws/aws-sdk-go/aws/credentials google.golang.org/cloud github.com/aws/aws-sdk-go/service/s3 github.com/aws/aws-sdk-go/service/s3/s3Manager Standard library imports fmt io