Module: Bakong::Khqr::Controllers::Generate

Defined in:
lib/bakong/khqr/controllers/generate.rb

Overview

Builds a KHQR EMVCo-TLV string from an IndividualInfo or MerchantInfo.

Class Method Summary collapse

Class Method Details

.additional_data_input(information) ⇒ Object 



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# File 'lib/bakong/khqr/controllers/generate.rb', line 108

def additional_data_input(information)
  {
    bill_number: information.bill_number,
    mobile_number: information.mobile_number,
    store_label: information.store_label,
    terminal_label: information.terminal_label,
    purpose_of_transaction: information.purpose_of_transaction
  }
end

.build_merchant_info(information, type) ⇒ Object 



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# File 'lib/bakong/khqr/controllers/generate.rb', line 90

def build_merchant_info(information, type)
  if type == :merchant
    {
      bakong_account_id: information.,
      merchant_id: information.respond_to?(:merchant_id) ? information.merchant_id : nil,
      acquiring_bank: information.acquiring_bank,
      is_merchant: true
    }
  else
    {
      bakong_account_id: information.,
      account_information: information.,
      acquiring_bank: information.acquiring_bank,
      is_merchant: false
    }
  end
end

.call(information, type) ⇒ Object 



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# File 'lib/bakong/khqr/controllers/generate.rb', line 16

def call(information, type)
  merchant_info = build_merchant_info(information, type)
  additional = additional_data_input(information)
  language = language_input(information)
  amount = information.amount
  qr_type = (amount.nil? || amount.zero?) ? EMV[:STATIC_QR] : EMV[:DYNAMIC_QR]

  parts = []
  parts << MerchantCode::PayloadFormatIndicator.new(
    EMV[:PAYLOAD_FORMAT_INDICATOR], EMV[:DEFAULT_PAYLOAD_FORMAT_INDICATOR]
  )
  parts << MerchantCode::PointOfInitiationMethod.new(EMV[:POINT_OF_INITIATION_METHOD], qr_type)

  upi = nil
  if information.
    upi = MerchantCode::UnionpayMerchantAccount.new(
      EMV[:UNIONPAY_MERCHANT_ACCOUNT], information.
    )
    parts << upi
  end

  khqr_type = type == :merchant ? EMV[:MERCHANT_ACCOUNT_INFORMATION_MERCHANT] : EMV[:MERCHANT_ACCOUNT_INFORMATION_INDIVIDUAL]
  parts << MerchantCode::GlobalUniqueIdentifier.new(khqr_type, merchant_info)

  parts << MerchantCode::MerchantCategoryCode.new(
    EMV[:MERCHANT_CATEGORY_CODE],
    (information.merchant_category_code || EMV[:DEFAULT_MERCHANT_CATEGORY_CODE]).to_s
  )
  parts << MerchantCode::TransactionCurrency.new(EMV[:TRANSACTION_CURRENCY], information.currency)

  if information.currency == CURRENCY[:usd] && upi
    raise Error.from(ERROR_CODES[:UPI_ACCOUNT_INFORMATION_INVALID_CURRENCY])
  end

  unless amount.nil? || amount.zero?
    formatted = format_amount(amount, information.currency)
    parts << MerchantCode::TransactionAmount.new(EMV[:TRANSACTION_AMOUNT], formatted)
  end

  parts << MerchantCode::CountryCode.new(EMV[:COUNTRY_CODE], EMV[:DEFAULT_COUNTRY_CODE])
  parts << MerchantCode::MerchantName.new(EMV[:MERCHANT_NAME], information.merchant_name)
  parts << MerchantCode::MerchantCity.new(
    EMV[:MERCHANT_CITY],
    (information.merchant_city || EMV[:DEFAULT_MERCHANT_CITY]).to_s
  )

  unless additional.values.all? { |v| v.nil? || v == "" }
    parts << MerchantCode::AdditionalData.new(EMV[:ADDITIONAL_DATA_TAG], additional)
  end

  unless language.values.all? { |v| v.nil? || v == "" }
    parts << MerchantCode::MerchantInformationLanguageTemplate.new(
      EMV[:MERCHANT_INFORMATION_LANGUAGE_TEMPLATE], language
    )
  end

  if qr_type == EMV[:DYNAMIC_QR]
    raise Error.from(ERROR_CODES[:EXPIRATION_TIMESTAMP_REQUIRED]) unless information.expiration_timestamp

    parts << MerchantCode::TimeStamp.new(
      EMV[:TIMESTAMP_TAG],
      {
        creation_timestamp: (Time.now.to_f * 1000).to_i,
        expiration_timestamp: information.expiration_timestamp
      },
      qr_type
    )
  end

  khqr_no_crc = parts.map(&:to_s).join
  khqr_with_crc_header = "#{khqr_no_crc}#{EMV[:CRC]}#{EMV[:CRC_LENGTH]}"
  khqr_with_crc_header + CRC16.compute(khqr_with_crc_header)
end

.format_amount(value, currency) ⇒ Object

KHR requires whole numbers; USD allows up to 2 decimal places. Matches the upstream JS amount normalization byte-for-byte (toFixed(2) for fractional USD; integer string for whole values; raises for KHR with any fractional component).



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# File 'lib/bakong/khqr/controllers/generate.rb', line 130

def format_amount(value, currency)
  if currency == CURRENCY[:khr]
    raise Error.from(ERROR_CODES[:TRANSACTION_AMOUNT_INVALID]) unless (value % 1).zero?

    value.to_i.to_s
  else
    string = if value.is_a?(Float) && (value % 1).zero?
               value.to_i.to_s
             else
               value.to_s
             end

    if string.include?(".")
      precision = string.split(".", 2)[1]
      raise Error.from(ERROR_CODES[:TRANSACTION_AMOUNT_INVALID]) if precision.length > 2

      format("%.2f", value)
    else
      string
    end
  end
end

.language_input(information) ⇒ Object 



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# File 'lib/bakong/khqr/controllers/generate.rb', line 118

def language_input(information)
  {
    language_preference: information.language_preference,
    merchant_name_alternate_language: information.merchant_name_alternate_language,
    merchant_city_alternate_language: information.merchant_city_alternate_language
  }
end