1 files changed, 12 insertions, 0 deletions
diff --git a/modules/packages/content_store.go b/modules/packages/content_store.go
index a3a5d1a666..be416ac269 100644
--- a/modules/packages/content_store.go
+++ b/modules/packages/content_store.go
@@ -7,8 +7,10 @@ package packages
 import (
 	"io"
 	"path"
+	"strings"
 
 	"code.gitea.io/gitea/modules/storage"
+	"code.gitea.io/gitea/modules/util"
 )
 
 // BlobHash256Key is the key to address a blob content
@@ -45,3 +47,13 @@ func (s *ContentStore) Delete(key BlobHash256Key) error {
 func KeyToRelativePath(key BlobHash256Key) string {
 	return path.Join(string(key)[0:2], string(key)[2:4], string(key))
 }
+
+// RelativePathToKey converts a relative path aa/bb/aabb000000... to the sha256 key aabb000000...
+func RelativePathToKey(relativePath string) (BlobHash256Key, error) {
+	parts := strings.SplitN(relativePath, "/", 3)
+	if len(parts) != 3 || len(parts[0]) != 2 || len(parts[1]) != 2 || len(parts[2]) < 4 || parts[0]+parts[1] != parts[2][0:4] {
+		return "", util.ErrInvalidArgument
+	}
+
+	return BlobHash256Key(parts[2]), nil
+}