imagetools: move auth function to separate file

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

util/imagetools/auth.go

@@ -0,0 +1,47 @@
+package imagetools
+
+import (
+	"encoding/base64"
+	"encoding/json"
+
+	"github.com/distribution/reference"
+)
+
+func toCredentialsFunc(a Auth) func(string) (string, string, error) {
+	return func(host string) (string, string, error) {
+		if host == "registry-1.docker.io" {
+			host = "https://index.docker.io/v1/"
+		}
+		ac, err := a.GetAuthConfig(host)
+		if err != nil {
+			return "", "", err
+		}
+		if ac.IdentityToken != "" {
+			return "", ac.IdentityToken, nil
+		}
+		return ac.Username, ac.Password, nil
+	}
+}
+
+func RegistryAuthForRef(ref string, a Auth) (string, error) {
+	if a == nil {
+		return "", nil
+	}
+	r, err := parseRef(ref)
+	if err != nil {
+		return "", err
+	}
+	host := reference.Domain(r)
+	if host == "docker.io" {
+		host = "https://index.docker.io/v1/"
+	}
+	ac, err := a.GetAuthConfig(host)
+	if err != nil {
+		return "", err
+	}
+	buf, err := json.Marshal(ac)
+	if err != nil {
+		return "", err
+	}
+	return base64.URLEncoding.EncodeToString(buf), nil
+}

util/imagetools/inspect.go

@@ -3,8 +3,6 @@ package imagetools
 import (
 	"bytes"
 	"context"
-	"encoding/base64"
-	"encoding/json"
 	"io"
 	"net/http"
 
@@ -121,42 +119,3 @@ func parseRef(s string) (reference.Named, error) {
 	ref = reference.TagNameOnly(ref)
 	return ref, nil
 }
-
-func toCredentialsFunc(a Auth) func(string) (string, string, error) {
-	return func(host string) (string, string, error) {
-		if host == "registry-1.docker.io" {
-			host = "https://index.docker.io/v1/"
-		}
-		ac, err := a.GetAuthConfig(host)
-		if err != nil {
-			return "", "", err
-		}
-		if ac.IdentityToken != "" {
-			return "", ac.IdentityToken, nil
-		}
-		return ac.Username, ac.Password, nil
-	}
-}
-
-func RegistryAuthForRef(ref string, a Auth) (string, error) {
-	if a == nil {
-		return "", nil
-	}
-	r, err := parseRef(ref)
-	if err != nil {
-		return "", err
-	}
-	host := reference.Domain(r)
-	if host == "docker.io" {
-		host = "https://index.docker.io/v1/"
-	}
-	ac, err := a.GetAuthConfig(host)
-	if err != nil {
-		return "", err
-	}
-	buf, err := json.Marshal(ac)
-	if err != nil {
-		return "", err
-	}
-	return base64.URLEncoding.EncodeToString(buf), nil
-}