Refactoring packages under types

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

types/blob/common.go

@@ -0,0 +1,74 @@
+package blob
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/opencontainers/go-digest"
+	"github.com/regclient/regclient/types/ref"
+)
+
+// Common interface is provided by all Blob implementations
+type Common interface {
+	Digest() digest.Digest
+	Length() int64
+	MediaType() string
+	Response() *http.Response
+	RawHeaders() http.Header
+	SetMeta(r ref.Ref, d digest.Digest, cl int64)
+	SetResp(resp *http.Response)
+}
+
+type common struct {
+	r         ref.Ref
+	digest    digest.Digest
+	cl        int64
+	mt        string
+	blobSet   bool
+	rawHeader http.Header
+	resp      *http.Response
+}
+
+// Digest returns the provided or calculated digest of the blob
+func (b *common) Digest() digest.Digest {
+	return b.digest
+}
+
+// Length returns the provided or calculated length of the blob
+func (b *common) Length() int64 {
+	return b.cl
+}
+
+// MediaType returns the Content-Type header received from the registry
+func (b *common) MediaType() string {
+	return b.mt
+}
+
+// RawHeaders returns the headers received from the registry
+func (b *common) RawHeaders() http.Header {
+	return b.rawHeader
+}
+
+// Response returns the response associated with the blob
+func (b *common) Response() *http.Response {
+	return b.resp
+}
+
+// SetMeta sets the various blob metadata (reference, digest, and content length)
+func (b *common) SetMeta(ref ref.Ref, d digest.Digest, cl int64) {
+	b.r = ref
+	b.digest = d
+	b.cl = cl
+}
+
+// SetResp sets the response header data when pulling from a registry
+func (b *common) SetResp(resp *http.Response) {
+	if resp == nil {
+		return
+	}
+	b.resp = resp
+	b.rawHeader = resp.Header
+	cl, _ := strconv.Atoi(resp.Header.Get("Content-Length"))
+	b.cl = int64(cl)
+	b.mt = resp.Header.Get("Content-Type")
+}