Referencing http request body as whole using transformRequestBody

Support
,
1

Hey folks,
Is there a simple way to reference http request body in transformRequestBody middleware?
Goal: transform request with body to put whole incoming request body into one key-value pair of outgoing request.
Incoming request body (key-value pair count may vary):

{
  "param1":"value1",
  "param2":"value2",
  "param3":"value3",
  "param_n":"value_n"
}

Desired outcome:

{
  "output": {
    "param1":"value1",
    "param2":"value2",
    "param3":"value3",
    "param_n":"value_n"
  }
}

in my template if I do:
"output": {{ . }} | jsonMarshal
it does the thing, but includes unwanted key-value pairs _tyk_context && _tyk_meta.
If I start playing by creating new object and indexing all key-value pairs but _tyk_context && _tyk_meta I never get a valid JSON output because of extra newlines or whitespaces.

Closest I’ve got with creating new object was this template (but result contains too much newlines to be correctly marshalled as json):

{{ $filtered := dict }}
{{ range $k, $v := . }}
  {{ if not (or (eq $k "_tyk_context") (eq $k "_tyk_meta")) }}
    {{ $_ := set $filtered $k $v }}
  {{ end }}
{{ end }}

{
  "output": {{ $filtered | jsonMarshal}}
}

Any advice please?

2

After some brainstorming came up with this template which does the trick:

{
"output": {
{{- $first := true }}
{{- range $k, $v := index . -}}
{{- if not (or (eq $k "_tyk_context") (eq $k "_tyk_meta")) -}}
{{- if $k -}}
{{- if not $first }},{{ end }}
"{{- $k -}}":{{- $v | jsonMarshal -}}
{{- $first = false }}
{{- end -}}
{{- end -}}
{{- end -}}
}
}

Maybe its not pretty or maybe there are better methods