The Ruby way to interact with Duo Admin API

duo_api_gist.rb

#!/usr/bin/env ruby

require 'base64'
require 'openssl'
require 'json'
require 'time'

# See Duo Admin API details here: https://duo.com/docs/adminapi#authentication
# TODO: replace URL/user/ikey/skey by your values
user = '502814310'
ikey = 'DIWJ8X6AEYOR5OMC6TQ1'
skey = 'Zh5eGmUq9zpfQnyUIu5OL9iWoMMv5ZNmk3zLJ4Ep'
now = Time.now.rfc2822

# GET requests use this five-line format:
#
# Sun, 13 Oct 2019 18:12:05 -0000
# GET
# api-XXXXXXXX.duosecurity.com
# /admin/v1/users
# username=502814310
canon = [
  now,
  "GET",
  "api-XXXXXXXX.duosecurity.com",
  "/admin/v1/users",
  "username=#{user}"
].join("\n")
auth = "#{ikey}:#{OpenSSL::HMAC.hexdigest('sha1', skey, canon)}"

query = %Q{curl -s -X GET -H "Date: #{now}" \
-H "Content-Type: application/x-www-form-urlencoded" \
-H "Authorization: Basic #{Base64.strict_encode64(auth)}" \
https://api-XXXXXXXX.duosecurity.com/admin/v1/users?username=#{user}}
puts "Query: #{query}\n"

response = `#{query}`
jobj = JSON.parse(response)
if jobj['stat'] == "FAIL"
  puts jobj['message']
else
  puts JSON.pretty_generate(jobj['response'])
end