Adds new REST API v2/

Addresses #5269

scripts/lua/rest/v2/get/pcap/live_extraction.lua

@@ -0,0 +1,59 @@
+--
+-- (C) 2013-21 - ntop.org
+--
+
+local dirs = ntop.getDirs()
+package.path = dirs.installdir .. "/scripts/lua/modules/?.lua;" .. package.path
+require "lua_utils"
+local json = require("dkjson")
+local recording_utils = require "recording_utils"
+local rest_utils = require("rest_utils")
+
+--
+-- Run a traffic extraction
+-- Example: curl -u admin:admin -H "Content-Type: application/json" -d '{"ifid": "1", "epoch_begin": 1589822000, "epoch_end": 15898221000 }' http://localhost:3000/lua/rest/v2/get/pcap/live_extraction.lua
+--
+-- NOTE: in case of invalid login, no error is returned but redirected to login
+--
+
+local ifid = tonumber(_GET["ifid"])
+local filter = _GET["bpf_filter"]
+local time_from = tonumber(_GET["epoch_begin"])
+local time_to = tonumber(_GET["epoch_end"])
+
+local rc = rest_utils.consts.success.ok
+
+if not recording_utils.isExtractionAvailable() then
+   rc = rest_utils.consts.err.not_granted
+   rest_utils.answer(rc)
+   return
+end
+
+if isEmptyString(ifid) then
+   rc = rest_utils.consts.err.invalid_interface
+   rest_utils.answer(rc)
+   return
+end
+
+if _GET["epoch_begin"] == nil or _GET["epoch_end"] == nil then
+   rc = rest_utils.consts.err.invalid_arguments
+   rest_utils.answer(rc)
+   return
+end
+
+interface.select(ifid)
+
+if filter == nil then
+   filter = ""
+end
+
+local timeline_path
+if recording_utils.getCurrentTrafficRecordingProvider(ifid) ~= "ntopng" then
+   timeline_path = recording_utils.getCurrentTrafficRecordingProviderTimelinePath(ifid)
+end
+
+local fname = time_from.."-"..time_to..".pcap"
+sendHTTPContentTypeHeader('application/vnd.tcpdump.pcap', 'attachment; filename="'..fname..'"')
+
+ntop.runLiveExtraction(ifid, time_from, time_to, filter, timeline_path)
+