Module: ICAP

Defined in:
lib/icap.rb

Class Method Summary collapse

Class Method Details

.calculate_bban(address) ⇒ Object

Calculates the BBAN of an ICAP from the Ethereum address

Example:

>> ICAP::calculate_bban "0x000072B1A5F4864C2BA2b14471e48Cc118264794"
=> "9JD3UD9BFMRCRDS1IC6BS5MTAQ38"

Arguments:

address: (String)



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# File 'lib/icap.rb', line 42

def self.calculate_bban address
  int = address.delete_prefix("0x").to_i 16
  bban = Base36::encode int
  bban.upcase!

  return bban
end

.calculate_iban_checksum(country_code, bban) ⇒ Object

Calculates the checksum of an IBAN

Example:

>> ICAP::calculate_iban_checksum "XE", "09JD3UD9BFMRCRDS1IC6BS5MTAQ38"
=> 43

Arguments:

country_code: (String)
bban: (String)



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# File 'lib/icap.rb', line 15

def self.calculate_iban_checksum country_code, bban
  checksum = "00"

  prepared_iban = "#{bban}#{country_code}#{checksum}"
  number = ""
  prepared_iban.each_char { |c|
    if ('A'..'Z').to_a.include? c
      number += (c.ord - "A".ord + 10).to_s
    else
      number += c
    end
  }
  checksum = 98 - (number.to_i % 97)
  checksum = checksum.to_s
  checksum = "0#{checksum}" if checksum.length == 1

  return checksum
end

.calculate_icap(bban) ⇒ Object

Calculates the ICAP from BBAN

Example:

>> ICAP::calculate_icap ICAP::calculate_bban "0x000072B1A5F4864C2BA2b14471e48Cc118264794"
=> "XE43 9JD3 UD9B FMRC RDS1 IC6B S5MT AQ38"

Arguments:

bban: (String)



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# File 'lib/icap.rb', line 58

def self.calculate_icap bban
  country_code = "XE"
  checksum = calculate_iban_checksum country_code, bban

  result = "#{country_code}#{checksum}#{bban}"
  result.gsub!(/(.{4})(?=.)/, '\1 \2')

  return result
end

.check_checksum?(iban) ⇒ Boolean

Checks the checksum.

Example:

>> ICAP::check_checksum? "XE43 9JD3 UD9B FMRC RDS1 IC6B S5MT AQ38"
=> true

Arguments:

iban: (String)

Returns:

  • (Boolean) 


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# File 'lib/icap.rb', line 93

def self.check_checksum? iban
  iban_ws = iban.delete " "  # iban_without_spaces = iban_ws
  prepared_iban = "#{iban_ws[4..-1]}#{iban_ws[0...4]}"
  
  number = ""
  prepared_iban.each_char { |c|
    if ('A'..'Z').to_a.include? c
      number += (c.ord - "A".ord + 10).to_s
    else
      number += c
    end
  }
  
  result = number.to_i % 97
  
  return result == 1
end

.extract_address(icap) ⇒ Object

Extracts the Ethereum address from an ICAP. The checksum is not checked.

Example:

>> ICAP::extract_address "XE43 9JD3 UD9B FMRC RDS1 IC6B S5MT AQ38"
=> "0x000072B1A5F4864C2BA2b14471e48Cc118264794"

Arguments:

icap: (String)



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# File 'lib/icap.rb', line 76

def self.extract_address icap
  iban_ws = icap.delete " "  # iban_without_spaces = iban_ws
  bban = iban_ws[4..-1]
  int = Base36.decode bban.downcase
  address_part = int.to_i.to_s 16
  
  return "0x#{"0" * (40 - address_part.length)}#{address_part}"
end