client_updated.rb

require 'httparty'
require 'hmac/signer'
require 'digest'
require 'json'
 
class SourceSystemClient
  include HTTParty
  debug_output $stderr
  base_uri 'http://localhost:9292'
 
  attr_accessor :hmac_secret
 
  def save_event(event)
    json_body = JSON.generate(event.to_hash)
    response = self.class.post('/events', body: json_body, headers: hmac_headers(json_body))
    response.code == 201
  end
 
  def hmac_headers(json_body)
    hmac = HMAC::Signer.new
    md5 = Digest::MD5.base64digest json_body
    now = Time.now
    headers = { 'Content-Md5' => md5 }
    signature = hmac.generate_signature(secret: @hmac_secret, method: 'POST', date: now.httpdate, path: '/events', headers: headers)
    headers.merge 'X-Hmac-Date' => now.httpdate, 'Authorization' => "HMAC #{signature}", 'Content-Type' => 'application/json'
  end
 
end