feat: mail service

mail/internal/adapters/id/uuid.go

@@ -0,0 +1,23 @@
+// Package id provides internal identifier generators used by Mail Service.
+package id
+
+import (
+	"fmt"
+
+	"galaxy/mail/internal/domain/common"
+
+	"github.com/google/uuid"
+)
+
+// Generator builds UUID-backed internal delivery identifiers.
+type Generator struct{}
+
+// NewDeliveryID returns one new UUID v4 delivery identifier.
+func (Generator) NewDeliveryID() (common.DeliveryID, error) {
+	value, err := uuid.NewRandom()
+	if err != nil {
+		return "", fmt.Errorf("new delivery id: %w", err)
+	}
+
+	return common.DeliveryID(value.String()), nil
+}