diff --git a/packages/shared/url_security.py b/packages/shared/url_security.py
index 5f08318ed..f7a9b5e6f 100755
--- a/packages/shared/url_security.py
+++ b/packages/shared/url_security.py
@@ -46,8 +46,15 @@ logger = logging.getLogger(__name__)
 # ── 兼容导出（保持原有变量名供外部引用） ──────────────────────────────────
 ALLOWED_SCHEMES = set(_allowed_schemes_base)
 ALLOWED_PORTS = set(_allowed_ports_base)
+ALLOWED_AUDIO_MIME_TYPES = set(_allowed_audio_base)
+ALLOWED_IMAGE_MIME_TYPES = set(_allowed_image_base)
+MAX_URL_LENGTH = _max_url_length_base
 UrlSecurityError = _UrlSecurityError_base
 
+# 私有别名（供测试和内部引用）
+_check_internal_hostnames = _check_internal_hostname_base
+_check_ssrf_ip = _check_ssrf_ip_base
+
 # 可信域名白名单（从环境变量读取）
 TRUSTED_DOMAINS: set[str] = set()
 _env_trusted = os.environ.get("URL_SECURITY_TRUSTED_DOMAINS", "")