Using Storj from AWS SDK for Go without the HTTP

gistfile1.go

// NoIOTransport can be used as an http.Client{Transport: NewNoIOTransport()},
// EG: s3.New(awsSession, aws.NewConfig().WithHTTPClient(&http.Client{Transport: NewNoIOTransport()}))
// downloader := s3manager.NewDownloader(awsSession, func(d *s3manager.Downloader) {
// d.S3 = s3.New(awsSession, aws.NewConfig().WithHTTPClient(&http.Client{Transport: NewNoIOTransport()}))
// })
// uploader := s3manager.NewUploader(awsSession, func(u *s3manager.Uploader) {
//	u.S3 = s3.New(awsSession, aws.NewConfig().WithHTTPClient(&http.Client{Transport: NewNoIOTransport()}))
// })
type NoIOTransport struct {
	r *mux.Router
}

func (n NoIOTransport) RoundTrip(req *http.Request) (resp *http.Response, err error) {
	req.Header.Set("Host", "s3.amazonaws.com") // I'm not sure yet why this is needed
	rec := httptest.NewRecorder()
	n.r.ServeHTTP(rec, req)
	return rec.Result(), nil
}

func NewNoIOTransport() NoIOTransport {
	GlobalActiveCred = auth.Credentials{AccessKey: "placeholder", SecretKey: "placeholder"}
	GlobalServerRegion = "us-east-1"

	r := mux.NewRouter()
	r.SkipClean(true)
	r.UseEncodedPath()

	access, err := uplink.ParseAccess(env.Get("ACCESS", ""))
	if err != nil {
		panic("ACCESS env var not set")
	}
	s3Config := miniogw.S3CompatibilityConfig{
		IncludeCustomMetadataListing: true,
		MaxKeysLimit:                 1000,
		MaxKeysExhaustiveLimit:       100000,
		FullyCompatibleListing:       false,
		DisableCopyObject:            false,
		MinPartSize:                  5242880,
	}
	uplinkConfig := uplink.Config{DialTimeout: time.Minute * 2, UserAgent: "s3link/0.0.1"}
	gst := miniogw.NewSingleTenantGateway(zap.L(), access, uplinkConfig, miniogw.NewStorjGateway(s3Config), false)
	gatewayLayer, err := gst.NewGatewayLayer(auth.Credentials{})
	if err != nil {
		panic("error starting gateway layer")
	}
	minio.RegisterAPIRouter(r, gatewayLayer, []string{"s3.amazonaws.com"}, 5)
	return NoIOTransport{r: r}
}

// GlobalActiveCred exposes minio's cmd.globalActiveCred
//
//nolint: golint
//go:linkname GlobalActiveCred storj.io/minio/cmd.globalActiveCred
var GlobalActiveCred auth.Credentials

// GlobalServerRegion exposes minio's cmd.globalServerRegion
//
//nolint: golint
//go:linkname GlobalServerRegion storj.io/minio/cmd.globalServerRegion
var GlobalServerRegion string