Adjusting types to use New/Opts initializers

Signed-off-by: Brandon Mitchell <git@bmitch.net>

types/blob/blob.go

@@ -1,7 +1,61 @@
 package blob
 
+import (
+	"io"
+	"net/http"
+
+	ociv1 "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/regclient/regclient/types/ref"
+)
+
 // Blob interface is used for returning blobs
 type Blob interface {
 	Common
 	RawBody() ([]byte, error)
 }
+
+type BlobConfig struct {
+	desc   ociv1.Descriptor
+	header http.Header
+	image  ociv1.Image
+	r      ref.Ref
+	rc     io.ReadCloser
+	resp   *http.Response
+}
+
+type Opts func(*BlobConfig)
+
+func WithDesc(d ociv1.Descriptor) Opts {
+	return func(bc *BlobConfig) {
+		bc.desc = d
+	}
+}
+func WithHeader(header http.Header) Opts {
+	return func(bc *BlobConfig) {
+		bc.header = header
+	}
+
+}
+func WithImage(image ociv1.Image) Opts {
+	return func(bc *BlobConfig) {
+		bc.image = image
+	}
+}
+func WithReadCloser(rc io.ReadCloser) Opts {
+	return func(bc *BlobConfig) {
+		bc.rc = rc
+	}
+}
+func WithRef(r ref.Ref) Opts {
+	return func(bc *BlobConfig) {
+		bc.r = r
+	}
+}
+func WithResp(resp *http.Response) Opts {
+	return func(bc *BlobConfig) {
+		bc.resp = resp
+		if bc.header == nil {
+			bc.header = resp.Header
+		}
+	}
+}