Add support for external (REST) host alerts (#7170)

scripts/lua/rest/v2/trigger/host/alert.lua

@@ -0,0 +1,52 @@
+--
+-- (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
+
+require "lua_utils"
+local auth = require "auth"
+local rest_utils = require "rest_utils"
+local all_alert_store = require "all_alert_store".new()
+
+--
+-- Trigger a custom host alert
+-- Example: curl -u admin:admin -H "Content-Type: application/json" -d '{"ifid": 0, "host": "192.168.2.134", "vlan": 0, "score": 100, "info": "Custom alert triggered thrugh the REST API"}' http://localhost:3000/lua/rest/v2/trigger/host/alert.lua
+--
+-- NOTE: in case of invalid login, no error is returned but redirected to login
+--
+
+local rc = rest_utils.consts.success.ok
+
+local ifid = _POST["ifid"]
+local hostinfo = url2hostinfo(_POST)
+local score = _POST["score"] or "0"
+local info = _POST["info"]
+
+if not auth.has_capability(auth.capabilities.alerts) then
+   rest_utils.answer(rest_utils.consts.err.not_granted)
+   return
+end
+
+if isEmptyString(ifid) then
+   rc = rest_utils.consts.err.invalid_interface
+   rest_utils.answer(rc)
+   return
+end
+
+if isEmptyString(hostinfo['host']) or
+   isEmptyString(info) then
+   rc = rest_utils.consts.err.invalid_args
+   rest_utils.answer(rc)
+   return
+end
+
+interface.select(ifid)
+
+interface.triggerExternalHostAlert(hostinfo2hostkey(hostinfo), tonumber(score), info)
+
+local res = {}
+
+rest_utils.answer(rc, res)