swagger_diff.rake

require 'swagger/diff'
require 'pp'

def get_swagger(path)
  token = ENV['JSONAPI_TOKEN']
  session = ActionDispatch::Integration::Session.new(Rails.application)
  session.get path, headers: {
    'Authorization' => "Token token=\"#{token}\""
  }
  session.response.body
end

task :swagger_diff, [:namespace, :local_host, :remote_host] => [:environment] do |_, args|
  local_host  = args[:local_host]  || 'http://localhost:3000'
  remote_host = args[:remote_host] || 'http://localhost:3000'
  namespace   = args[:namespace]   || 'api'

  old  = get_swagger("#{remote_host}/#{namespace}/swagger.json")
  new  = get_swagger("#{local_host}/#{namespace}/swagger.json")
  diff = Swagger::Diff::Diff.new(old, new)

  if diff.compatible?
    puts 'No backwards incompatibilities found!'
  else
    pp JSON.parse(diff.incompatibilities)
    raise 'Uh oh, found a backwards-incompatibility!'
  end
end