1 files changed, 65 insertions, 0 deletions
diff --git a/refstore/files/transaction_validate.go b/refstore/files/transaction_validate.go
new file mode 100644
index 00000000..784db2a4
--- /dev/null
+++ b/refstore/files/transaction_validate.go
@@ -0,0 +1,65 @@
+package files
+
+import (
+	"fmt"
+	"strings"
+
+	"codeberg.org/lindenii/furgit/objectid"
+	"codeberg.org/lindenii/furgit/ref/refname"
+)
+
+func (tx *Transaction) validateOp(op txOp) error {
+	if op.name == "" {
+		return fmt.Errorf("refstore/files: empty reference name")
+	}
+
+	switch op.kind {
+	case txCreate, txUpdate:
+		err := refname.ValidateUpdateName(op.name, true)
+		if err != nil {
+			return err
+		}
+
+		if op.newID.Size() == 0 {
+			return objectid.ErrInvalidAlgorithm
+		}
+	case txDelete, txVerify:
+		err := refname.ValidateUpdateName(op.name, false)
+		if err != nil {
+			return err
+		}
+
+		if op.oldID.Size() == 0 {
+			return objectid.ErrInvalidAlgorithm
+		}
+	case txCreateSymbolic, txUpdateSymbolic:
+		err := refname.ValidateUpdateName(op.name, true)
+		if err != nil {
+			return err
+		}
+
+		if strings.TrimSpace(op.newTarget) == "" {
+			return fmt.Errorf("refstore/files: empty symbolic target")
+		}
+
+		err = refname.ValidateSymbolicTarget(op.name, strings.TrimSpace(op.newTarget))
+		if err != nil {
+			return err
+		}
+	case txDeleteSymbolic, txVerifySymbolic:
+		err := refname.ValidateUpdateName(op.name, false)
+		if err != nil {
+			return err
+		}
+	default:
+		return fmt.Errorf("refstore/files: unsupported transaction operation %d", op.kind)
+	}
+
+	if op.kind == txUpdateSymbolic || op.kind == txDeleteSymbolic || op.kind == txVerifySymbolic {
+		if strings.TrimSpace(op.oldTarget) == "" {
+			return fmt.Errorf("refstore/files: empty symbolic old target")
+		}
+	}
+
+	return nil
+}