Lua Envoy upstream proxy - nginx

Question

im looking to replace some login logic in on kong, for permission checks on a specific url (like upstream) to an envoy filter in istio.
apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
name: api-auth
namespace: api
spec:
workloadLabels:
app: api
filters:
- listenerMatch:
listenerType: SIDECAR_INBOUND
listenerProtocol: HTTP
filterName: envoy.lua
filterType: HTTP
filterConfig:
inlineCode: |
function version()
return "v1"
end
function log(handle, value)
handle:logInfo(version() .. ": " .. value)
end
function dump(o)
if type(o) == 'table' then
local s = '{ '
for k,v in pairs(o) do
if type(k) ~= 'number' then k = '"'..k..'"' end
s = s .. '['..k..'] = ' .. dump(v) .. ','
end
return s .. '} '
else
return tostring(o)
end
end
function is_empty(value)
return value == nil or value == ""
end
function get_header(handle, header)
return handle:headers():get(header)
end
function envoy_on_request(request_handle)
local auth_host = "auth-service.services.svc.cluster.local"
local path = "/api/v1/has-permission"
local cluster = "outbound|8080||" .. auth_host
local request_headers = {
[":method"] = "POST",
[":path"] = path,
[":authority"] = auth_host,
["Authorization"] = get_header(request_handle, "Authorization")
}
local request_body = ""
local timeout = 5000 --ms
log(request_handle, "Sending auth request, headers: " .. dump(request_headers) .. ", request_body: " .. request_body .. ", timeout: " .. timeout)
local response_headers, response_body = request_handle:httpCall(
tostring(cluster),
request_headers,
request_body,
timeout
)
log(request_handle, "response_headers: " .. dump(response_headers))
log(request_handle, "response_body: " .. dump(response_body))
if tonumber(response_headers[":status"]) ~= 200 then
log(request_handle, "Key Authentication Failed")
request_handle:respond(
{[":status"] = response_headers[":status"]},
response_body
)
do return end
end
end
so this is my lua, but im still missing something, i need to send extra parameters on my body post request.
example working curl:
curl -i 'https://foo-api.com/list' \
-H 'Connection: keep-alive' \
-H 'Pragma: no-cache' \
-H 'Cache-Control: no-cache' \
-H 'AuthCode: cmdpby50ZWl4ZWlyYUBqdW1pYS5jb20iLCJleHAiOjE1ODUwNDg2MjIsImlzcyI6ImZpcmV3b3JrcyJ9.JkvIhmQuumS32HhSzKuAhpPvjLVwOrRJXwajMjBU9Ag' \
-H 'Accept-Language: en' \
-H 'Authorization: Bearer 6InNlcmdpby50ZWl4ZWlyYUBqdW1pYS5jb20iLCJleHAiOjE1ODUwNDg2MjIsImlzcyI6ImZpcmV3b3JrcyJ9.JkvIhmQuumS32HhSzKuAhpPvjLVwOrRJXwajMjBU9Ag' \
-H 'Accept: application/json, text/plain, */*' \
-H 'Sec-Fetch-Dest: empty' \
-H 'application: COMPANYCODE'
how iam supposed to send this kind of content inside the post using lua?
thanks and best regards