Syntax for groovy to duplicate PowerShell Invoke-RestMethod - powershell

Question

I'm trying to duplicate the PowerShell Invoke-RestMethod to something similar in Groovy (groovy is standard we use in our coded pipeline).
I've done a lot of searching without success. I was wondering if I can get some help or suggestions on a possible alternative if there isn't a similar call?
The 3 three lines of PowerShell I'm trying to duplicate in Groovy are:
$tokenrequest = #{ "grant_type" = "password"; "username" = "adminuser"; "password" = "adminpassword" }
$token = Invoke-RestMethod -Uri "http://abcd.com/executionmanager/api/Token" -ContentType application/x-www-form-urlencoded -Headers #{ Authorization = ("OAuth2")} -Method POST -Body $tokenrequest
$token = $token.access_token

Answer 1

there are a lot of libraries to do that
the following one quite unknown
//download dependency from maven repository
#Grab(group='acme.groovy', module='acmehttp', version='20180403')
import groovyx.acme.net.AcmeHTTP
def ctx = AcmeHTTP.post(
url: "https://httpbin.org/post", //the url could be used for tests
//define body as map as soon as we are sending it as www-form
body: [ "grant_type": "password", "username": "adminuser", "password": "adminpassword" ],
headers:[
"content-type":"application/x-www-form-urlencoded",
"Authorization": "OAuth2"
],
)
assert ctx.response.code==200
//the url https://httpbin.org/post always returns json
assert ctx.response.contentType =~ "/json"
assert ctx.response.body instanceof Map
println ctx.response.body
//i guess your token should be accessible like this:
//println ctx.response.body.access_token