Simple Sinatra server that will accept webhook payloads from Front, and verify their authenticity

frontapp_webhook.rb

require 'sinatra'
require 'openssl'
require 'Base64'

SECRET_KEY = "your-secret-key"

post '/payload' do
  
  payload = request.body.read
  
  if Base64.encode64(OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha1'), SECRET_KEY, payload)).strip() == request.env['HTTP_X_FRONT_SIGNATURE']
    puts "Everything is safe - run my code!"
  else
    puts "Danger!"
  end
end