Add authentication

src/main/kotlin/top/fatweb/api/util/WebUtil.kt

@@ -0,0 +1,10 @@
+package top.fatweb.api.util
+
+import org.springframework.security.core.context.SecurityContextHolder
+import top.fatweb.api.entity.permission.LoginUser
+
+object WebUtil {
+    fun getLoginUser() = SecurityContextHolder.getContext().authentication.principal as LoginUser
+
+    fun getLoginUserId() = getLoginUser().user.id
+}