Pact example code

client.rb

require 'httparty'
require 'hmac/signer'
require 'digest'

class SourceSystemClient
  include HTTParty
  base_uri 'http://events-service'

  attr_reader :hmac_secret

  def save_event(event)
    json_body = event.to_json
    response = self.class.post('/events', body: json_body, headers: hmac_headers(json_body))
    response.code == 200
  end

  def hmac_headers(json_body)
    hmac = HMAC.new
    md5 = Digest::MD5.hexdigest json_body
    now = Time.now
    headers = { 'Content-Md5' => md5 }
    signature => hmac.generate_signature(secret: @hmac_secret, method: 'POST', date: now, path: '/events', headers: headers)
    headers.merge 'X-Hmac-Date' => now.httpdate, 'Authorization' => "HMAC #{signature}", 'Content-Type' => 'application/json'
  end

end