alternativa_buda.rb

require 'JSON'
require 'httpparty'

HOST = 'https://www.buda.com'

def new_order(symbol, amount, type, side, price = nil)
  side = side == :buy ? 'Bid' : 'Ask'
  payload = { order: { type: side, price_type: type.to_s,
                        limit: price.to_s, amount: amount.to_s } }
  path = "/api/v2/markets/#{symbol}/orders"
  url = "#{HOST}#{path}"
  HTTParty.post(url, body: payload, headers: headers('POST', path, payload.to_json))
end


# Authentication.
def generate_nonce
  (Time.now.to_f.round(3) * 1000).to_i.to_s
end

def signature(request_type, path, nonce, payload = nil)
  if payload.nil?
    "#{request_type} #{path} #{nonce}"
  else
    "#{request_type} #{path} #{Base64.strict_encode64(payload)} #{nonce}"
  end
end

def headers(request_type, path, payload = nil)
  nonce = generate_nonce
  encrypted_signature = OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha384'),
    ENV.fetch('BUDA_API_SECRET'), signature(request_type, path, nonce, payload))
  {
    'X-SBTC-APIKEY' => ENV.fetch('BUDA_API_KEY'),
    'X-SBTC-NONCE' => nonce,
    'X-SBTC-SIGNATURE' => encrypted_signature,
    'Content-Type' => 'application/json'
  }
end