Add public bundle manifest package

internal/bundle/digest.go

@@ -1,12 +1,10 @@
 package bundle
 
 import (
-	"crypto/sha256"
-	"encoding/hex"
 	"fmt"
 	"regexp"
-	"strconv"
-	"strings"
+
+	publicbundle "gitea.maximumdirect.net/eric/distributor/pkg/bundle"
 )
 
 var digestPattern = regexp.MustCompile(`^sha256:[0-9a-f]{64}$`)
@@ -19,31 +17,13 @@ func ValidateDigest(value string) error {
 }
 
 func FileDigest(data []byte) string {
-	sum := sha256.Sum256(data)
-	return "sha256:" + hex.EncodeToString(sum[:])
+	return publicbundle.FileDigest(data)
 }
 
 func BundleDigest(files []ManifestFile) string {
-	canonical := CanonicalFilePayload(files)
-	sum := sha256.Sum256([]byte(canonical))
-	return "sha256:" + hex.EncodeToString(sum[:])
+	return publicbundle.BundleDigest(files)
 }
 
 func CanonicalFilePayload(files []ManifestFile) string {
-	var builder strings.Builder
-	builder.WriteByte('[')
-	for index, file := range files {
-		if index > 0 {
-			builder.WriteByte(',')
-		}
-		builder.WriteString(`{"path":`)
-		builder.WriteString(strconv.Quote(file.Path))
-		builder.WriteString(`,"sha256":`)
-		builder.WriteString(strconv.Quote(file.SHA256))
-		builder.WriteString(`,"size":`)
-		builder.WriteString(strconv.FormatInt(file.Size, 10))
-		builder.WriteByte('}')
-	}
-	builder.WriteByte(']')
-	return builder.String()
+	return publicbundle.CanonicalFilePayload(files)
 }