Move imageID validation to stringid pkg

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

image/v1/imagev1.go

@@ -2,9 +2,7 @@ package v1
 
 import (
 	"encoding/json"
-	"fmt"
 	"reflect"
-	"regexp"
 	"strings"
 
 	"github.com/Sirupsen/logrus"
@@ -12,10 +10,9 @@ import (
 	"github.com/docker/docker/api/types/versions"
 	"github.com/docker/docker/image"
 	"github.com/docker/docker/layer"
+	"github.com/docker/docker/pkg/stringid"
 )
 
-var validHex = regexp.MustCompile(`^([a-f0-9]{64})$`)
-
 // noFallbackMinVersion is the minimum version for which v1compatibility
 // information will not be marshaled through the Image struct to remove
 // blank fields.
@@ -149,8 +146,5 @@ func rawJSON(value interface{}) *json.RawMessage {
 
 // ValidateID checks whether an ID string is a valid image ID.
 func ValidateID(id string) error {
-	if ok := validHex.MatchString(id); !ok {
-		return fmt.Errorf("image ID %q is invalid", id)
-	}
-	return nil
+	return stringid.ValidateID(id)
 }

pkg/stringid/stringid.go

@@ -4,6 +4,7 @@ package stringid
 import (
 	"crypto/rand"
 	"encoding/hex"
+	"fmt"
 	"io"
 	"regexp"
 	"strconv"
@@ -14,7 +15,10 @@ import (
 
 const shortLen = 12
 
-var validShortID = regexp.MustCompile("^[a-z0-9]{12}$")
+var (
+	validShortID = regexp.MustCompile("^[a-f0-9]{12}$")
+	validHex     = regexp.MustCompile(`^[a-f0-9]{64}$`)
+)
 
 // IsShortID determines if an arbitrary string *looks like* a short ID.
 func IsShortID(id string) bool {
@@ -67,3 +71,11 @@ func GenerateRandomID() string {
 func GenerateNonCryptoID() string {
 	return generateID(false)
 }
+
+// ValidateID checks whether an ID string is a valid image ID.
+func ValidateID(id string) error {
+	if ok := validHex.MatchString(id); !ok {
+		return fmt.Errorf("image ID %q is invalid", id)
+	}
+	return nil
+}

reference/reference.go

@@ -7,7 +7,7 @@ import (
 
 	"github.com/docker/distribution/digest"
 	distreference "github.com/docker/distribution/reference"
-	"github.com/docker/docker/image/v1"
+	"github.com/docker/docker/pkg/stringid"
 )
 
 const (
@@ -163,7 +163,7 @@ func IsNameOnly(ref Named) bool {
 // ParseIDOrReference parses string for an image ID or a reference. ID can be
 // without a default prefix.
 func ParseIDOrReference(idOrRef string) (digest.Digest, Named, error) {
-	if err := v1.ValidateID(idOrRef); err == nil {
+	if err := stringid.ValidateID(idOrRef); err == nil {
 		idOrRef = "sha256:" + idOrRef
 	}
 	if dgst, err := digest.ParseDigest(idOrRef); err == nil {
@@ -209,7 +209,7 @@ func normalize(name string) (string, error) {
 }
 
 func validateName(name string) error {
-	if err := v1.ValidateID(name); err == nil {
+	if err := stringid.ValidateID(name); err == nil {
 		return fmt.Errorf("Invalid repository name (%s), cannot specify 64-byte hexadecimal strings", name)
 	}
 	return nil