Adds new REST API v2/

Addresses #5269

scripts/lua/rest/v2/get/am_host/alert/ts.lua

@@ -0,0 +1,34 @@
+--
+-- (C) 2013-21 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+package.path = dirs.installdir .. "/scripts/lua/modules/alert_store/?.lua;" .. package.path
+
+local alert_utils = require "alert_utils"
+local alert_consts = require "alert_consts"
+local alert_entities = require "alert_entities"
+local rest_utils = require("rest_utils")
+local am_alert_store = require "am_alert_store".new()
+local auth = require "auth"
+
+--
+-- Read alerts count by time
+-- Example: curl -u admin:admin -H "Content-Type: application/json" -d '{ }' http://localhost:3000/lua/rest/v2/get/active_monitoring/alert/ts.lua
+--
+-- NOTE: in case of invalid login, no error is returned but redirected to login
+--
+
+local rc = rest_utils.consts.success.ok
+
+if not auth.has_capability(auth.capabilities.alerts) then
+   rest_utils.answer(rest_utils.consts.err.not_granted)
+   return
+end
+
+interface.select(getSystemInterfaceId())
+
+local res = am_alert_store:count_by_severity_and_time_request()
+
+rest_utils.answer(rc, res)