Refactors alerts and flow statuses in builtin and plugins

Implements #3811
Implements #3812

Refactors builtin alerts

Refactors builtin flow statuses

scripts/lua/modules/flow_status_definitions/status_external_alert.lua

@@ -0,0 +1,53 @@
+--
+-- (C) 2019-20 - ntop.org
+--
+
+local status_keys = require "flow_keys"
+
+local alert_consts = require("alert_consts")
+
+-- #################################################################
+
+local function formatIDSAlert(alert)
+   local signature = (alert and alert.signature)
+   local category = (alert and alert.category)
+   local signature_info = (signature and signature:split(" "));
+   local maker = (signature_info and table.remove(signature_info, 1))
+   local scope = (signature_info and table.remove(signature_info, 1))
+   local msg = (signature_info and table.concat(signature_info, " "))
+   if maker and alert_consts.ids_rule_maker[maker] then
+      maker = alert_consts.ids_rule_maker[maker]
+   end
+   return i18n("flow_details.ids_alert", { scope=scope, msg=msg, maker=maker })
+end
+
+-- #################################################################
+
+local function formatExternalAlert(flowstatus_info)
+   local res = i18n("alerts_dashboard.external_alert")
+
+   if not flowstatus_info then
+      return res
+   end
+
+   -- Available fields:
+   -- flowstatus_info.source (e.g. suricata)
+   -- flowstatus_info.severity_id (custom severity)
+   -- flowstatus_info.alert (alert metadata)
+
+   if flowstatus_info.source == "suricata" then
+      res = formatIDSAlert(flowstatus_info.alert)
+   end
+
+   return res
+end
+
+-- #################################################################
+
+return {
+  status_key = status_keys.ntopng.status_external_alert,
+  alert_severity = alert_consts.alert_severities.error,
+  alert_type = alert_consts.alert_types.external_alert,
+  i18n_title = "alerts_dashboard.external_alert",
+  i18n_description = formatExternalAlert
+}