Use TrustedRequestFactory to make an HTTP GET request without the user password

import com.atlassian.oauth.Request
import com.atlassian.sal.api.ApplicationProperties
import com.atlassian.sal.api.UrlMode
import com.onresolve.scriptrunner.runner.customisers.PluginModule
import groovy.json.JsonSlurper

import java.net.http.HttpClient
import java.net.http.HttpRequest
import java.net.http.HttpResponse

@PluginModule
ApplicationProperties applicationProperties

def url = applicationProperties.getBaseUrl(UrlMode.CANONICAL) + '/rest/api/2/myself'

def request = HttpRequest.newBuilder()
    .uri(OAuthRequestSigner.createOAuthUri(url))
    .header("Content-Type", "application/json")
    .header("Authorization", OAuthRequestSigner.createAuthorizationHeader(url, Request.HttpMethod.GET))
    .GET()
    .build()

def response = HttpClient.newHttpClient()
    .send(request, HttpResponse.BodyHandlers.ofString())

if (response.statusCode() >= 400) {
    throw new Exception("Status code: ${response.statusCode()}. Response body: ${response.body()}")
}

def currentUser = new JsonSlurper().parseText(response.body()) as Map

currentUser

/*
   responseBody is a JSON string that looks like:

  {
    "self": "http://localhost:8080/jira/rest/api/2/user?username=admin",
    "key": "admin",
    "name": "admin",
    "emailAddress": "admin@admin.com",
    "avatarUrls": {
      "48x48": "https://www.gravatar.com/avatar/64e1b8d34f425d19e1ee2ea7236d3028?d=mm&s=48",
      "24x24": "https://www.gravatar.com/avatar/64e1b8d34f425d19e1ee2ea7236d3028?d=mm&s=24",
      "16x16": "https://www.gravatar.com/avatar/64e1b8d34f425d19e1ee2ea7236d3028?d=mm&s=16",
      "32x32": "https://www.gravatar.com/avatar/64e1b8d34f425d19e1ee2ea7236d3028?d=mm&s=32"
    },
    "displayName": "Mr Admin",
    "active": true,
    "timeZone": "Europe/London",
    "locale": "en_GB",
    "groups": {
      "size": 4,
      "items": [
      ]
    },
    "applicationRoles": {
      "size": 2,
      "items": [
      ]
    },
    "expand": "groups,applicationRoles"
  }
*/