Story#107571572 can create SEB bank request

app/models/bank_link.rb

@@ -0,0 +1,83 @@
+class BankLink
+  module Base
+    def prepend_size(value)
+      value = (value || "").to_s.strip
+      string = ""
+      string << sprintf("%03i", value.size)
+      string << value
+    end
+  end
+
+  class Request
+    include Base
+    include ActionView::Helpers::NumberHelper
+
+    # need controller here in order to handle random ports and domains
+    # I don't want to do it but has to
+    attr_accessor :type, :invoice, :controller
+    def initialize(type, invoice, controller)
+      @type, @invoice, @controller = type, invoice, controller
+    end
+
+    def url
+      ENV["payments_#{type}_url"]
+    end
+
+    def fields
+      @fields ||= (hash = {}
+      hash["VK_SERVICE"]  = "1012"
+      hash["VK_VERSION"]  = "008"
+      hash["VK_SND_ID"]   = ENV["payments_#{type}_seller_account"]
+      hash["VK_STAMP"]    = invoice.number
+      hash["VK_AMOUNT"]   = number_with_precision(invoice.sum_cache, :precision => 2, :separator => ".")
+      hash["VK_CURR"]     = invoice.currency
+      hash["VK_REF"]      = ""
+      hash["VK_MSG"]      = "Order nr. #{invoice.number}"
+      hash["VK_RETURN"]   = controller.registrar_return_payment_with_url(type)
+      hash["VK_CANCEL"]   = controller.registrar_return_payment_with_url(type)
+      hash["VK_DATETIME"] = Time.now.strftime("%Y-%m-%dT%H:%M:%S%z")
+      hash["VK_MAC"]      = calc_mac(hash)
+      hash["VK_ENCODING"] = "UTF-8"
+      hash["VK_LANG"]     = "ENG"
+      hash)
+    end
+
+    def calc_mac(fields)
+      pars = %w(VK_SERVICE VK_VERSION VK_SND_ID VK_STAMP VK_AMOUNT VK_CURR VK_REF VK_MSG VK_RETURN VK_CANCEL VK_DATETIME)
+      data = pars.map{|e| prepend_size(fields[e]) }.join
+
+      sign(data)
+    end
+
+    def make_transaction
+      transaction = BankTransaction.where(description: fields["VK_MSG"]).first_or_initialize(
+          reference_no: invoice.reference_no,
+          currency: invoice.currency,
+      )
+
+      transaction.save!
+    end
+
+    private
+    def sign(data)
+      private_key = OpenSSL::PKey::RSA.new(File.read(ENV["payments_#{type}_seller_private"]))
+
+      signed_data = private_key.sign(OpenSSL::Digest::SHA1.new, data)
+      signed_data = Base64.encode64(signed_data).gsub(/\n|\r/, '')
+      signed_data
+    end
+  end
+
+
+
+
+  class Response
+    attr_accessor :type, :params
+    def initialize(type, params)
+      @type, @params = type, params
+    end
+    def bank_public_key
+      OpenSSL::X509::Certificate.new(certificate).public_key
+    end
+  end
+end