currency_by_ip.rb

# Detect currency by IP address.
#
# Requires the GeoIP gem and a `lib/geo/GeoIP.dat` file with geographic info.
# See https://github.com/cjheath/geoip
#
# Example:
#
#     require "geoip"
#     CurrencyByIP.new("78.193.246.42").currency => "EUR"
#
class CurrencyByIP
  # Path to GeoIP data file
  GEO_IP_DATA_FILE = 'lib/geo/GeoIP.dat'

  # ISO2 country codes to country currency codes
  # via http://country.io/data/
  CURRENCIES = {
    "AD" => "EUR",
    "AE" => "AED",
    "AF" => "AFN",
    "AG" => "XCD",
    "AI" => "XCD",
    "AL" => "ALL",
    "AM" => "AMD",
    "AO" => "AOA",
    "AQ" => "",
    "AR" => "ARS",
    "AS" => "USD",
    "AT" => "EUR",
    "AU" => "AUD",
    "AW" => "AWG",
    "AX" => "EUR",
    "AZ" => "AZN",
    "BA" => "BAM",
    "BB" => "BBD",
    "BD" => "BDT",
    "BE" => "EUR",
    "BF" => "XOF",
    "BG" => "BGN",
    "BH" => "BHD",
    "BI" => "BIF",
    "BJ" => "XOF",
    "BL" => "EUR",
    "BM" => "BMD",
    "BN" => "BND",
    "BO" => "BOB",
    "BQ" => "USD",
    "BR" => "BRL",
    "BS" => "BSD",
    "BT" => "BTN",
    "BV" => "NOK",
    "BW" => "BWP",
    "BY" => "BYR",
    "BZ" => "BZD",
    "CA" => "CAD",
    "CC" => "AUD",
    "CD" => "CDF",
    "CF" => "XAF",
    "CG" => "XAF",
    "CH" => "CHF",
    "CI" => "XOF",
    "CK" => "NZD",
    "CL" => "CLP",
    "CM" => "XAF",
    "CN" => "CNY",
    "CO" => "COP",
    "CR" => "CRC",
    "CU" => "CUP",
    "CV" => "CVE",
    "CW" => "ANG",
    "CX" => "AUD",
    "CY" => "EUR",
    "CZ" => "CZK",
    "DE" => "EUR",
    "DJ" => "DJF",
    "DK" => "DKK",
    "DM" => "XCD",
    "DO" => "DOP",
    "DZ" => "DZD",
    "EC" => "USD",
    "EE" => "EUR",
    "EG" => "EGP",
    "EH" => "MAD",
    "ER" => "ERN",
    "ES" => "EUR",
    "ET" => "ETB",
    "FI" => "EUR",
    "FJ" => "FJD",
    "FK" => "FKP",
    "FM" => "USD",
    "FO" => "DKK",
    "FR" => "EUR",
    "GA" => "XAF",
    "GB" => "GBP",
    "GD" => "XCD",
    "GE" => "GEL",
    "GF" => "EUR",
    "GG" => "GBP",
    "GH" => "GHS",
    "GI" => "GIP",
    "GL" => "DKK",
    "GM" => "GMD",
    "GN" => "GNF",
    "GP" => "EUR",
    "GQ" => "XAF",
    "GR" => "EUR",
    "GS" => "GBP",
    "GT" => "GTQ",
    "GU" => "USD",
    "GW" => "XOF",
    "GY" => "GYD",
    "HK" => "HKD",
    "HM" => "AUD",
    "HN" => "HNL",
    "HR" => "HRK",
    "HT" => "HTG",
    "HU" => "HUF",
    "ID" => "IDR",
    "IE" => "EUR",
    "IL" => "ILS",
    "IM" => "GBP",
    "IN" => "INR",
    "IO" => "USD",
    "IQ" => "IQD",
    "IR" => "IRR",
    "IS" => "ISK",
    "IT" => "EUR",
    "JE" => "GBP",
    "JM" => "JMD",
    "JO" => "JOD",
    "JP" => "JPY",
    "KE" => "KES",
    "KG" => "KGS",
    "KH" => "KHR",
    "KI" => "AUD",
    "KM" => "KMF",
    "KN" => "XCD",
    "KP" => "KPW",
    "KR" => "KRW",
    "KW" => "KWD",
    "KY" => "KYD",
    "KZ" => "KZT",
    "LA" => "LAK",
    "LB" => "LBP",
    "LC" => "XCD",
    "LI" => "CHF",
    "LK" => "LKR",
    "LR" => "LRD",
    "LS" => "LSL",
    "LT" => "LTL",
    "LU" => "EUR",
    "LV" => "EUR",
    "LY" => "LYD",
    "MA" => "MAD",
    "MC" => "EUR",
    "MD" => "MDL",
    "ME" => "EUR",
    "MF" => "EUR",
    "MG" => "MGA",
    "MH" => "USD",
    "MK" => "MKD",
    "ML" => "XOF",
    "MM" => "MMK",
    "MN" => "MNT",
    "MO" => "MOP",
    "MP" => "USD",
    "MQ" => "EUR",
    "MR" => "MRO",
    "MS" => "XCD",
    "MT" => "EUR",
    "MU" => "MUR",
    "MV" => "MVR",
    "MW" => "MWK",
    "MX" => "MXN",
    "MY" => "MYR",
    "MZ" => "MZN",
    "NA" => "NAD",
    "NC" => "XPF",
    "NE" => "XOF",
    "NF" => "AUD",
    "NG" => "NGN",
    "NI" => "NIO",
    "NL" => "EUR",
    "NO" => "NOK",
    "NP" => "NPR",
    "NR" => "AUD",
    "NU" => "NZD",
    "NZ" => "NZD",
    "OM" => "OMR",
    "PA" => "PAB",
    "PE" => "PEN",
    "PF" => "XPF",
    "PG" => "PGK",
    "PH" => "PHP",
    "PK" => "PKR",
    "PL" => "PLN",
    "PM" => "EUR",
    "PN" => "NZD",
    "PR" => "USD",
    "PS" => "ILS",
    "PT" => "EUR",
    "PW" => "USD",
    "PY" => "PYG",
    "QA" => "QAR",
    "RE" => "EUR",
    "RO" => "RON",
    "RS" => "RSD",
    "RU" => "RUB",
    "RW" => "RWF",
    "SA" => "SAR",
    "SB" => "SBD",
    "SC" => "SCR",
    "SD" => "SDG",
    "SE" => "SEK",
    "SG" => "SGD",
    "SH" => "SHP",
    "SI" => "EUR",
    "SJ" => "NOK",
    "SK" => "EUR",
    "SL" => "SLL",
    "SM" => "EUR",
    "SN" => "XOF",
    "SO" => "SOS",
    "SR" => "SRD",
    "SS" => "SSP",
    "ST" => "STD",
    "SV" => "USD",
    "SX" => "ANG",
    "SY" => "SYP",
    "SZ" => "SZL",
    "TC" => "USD",
    "TD" => "XAF",
    "TF" => "EUR",
    "TG" => "XOF",
    "TH" => "THB",
    "TJ" => "TJS",
    "TK" => "NZD",
    "TL" => "USD",
    "TM" => "TMT",
    "TN" => "TND",
    "TO" => "TOP",
    "TR" => "TRY",
    "TT" => "TTD",
    "TV" => "AUD",
    "TW" => "TWD",
    "TZ" => "TZS",
    "UA" => "UAH",
    "UG" => "UGX",
    "UM" => "USD",
    "US" => "USD",
    "UY" => "UYU",
    "UZ" => "UZS",
    "VA" => "EUR",
    "VC" => "XCD",
    "VE" => "VEF",
    "VG" => "USD",
    "VI" => "USD",
    "VN" => "VND",
    "VU" => "VUV",
    "WF" => "XPF",
    "WS" => "WST",
    "XK" => "EUR",
    "YE" => "YER",
    "YT" => "EUR",
    "ZA" => "ZAR",
    "ZM" => "ZMK",
    "ZW" => "ZWL",
  }


  def initialize(ip)
    @ip = ip
  end

  def currency
    CURRENCIES[country_code]
  end


  private

  def country_code
    @country_code ||= GeoIP.new(GEO_IP_DATA_FILE).country(@ip).country_code2
  end

end

currency_by_ip_spec.rb

require "spec_helper"

describe CurrencyByIP do
  it "detects USD for Google's IP" do
    expect(CurrencyByIP.new("173.194.34.1").currency).to eq("USD")
  end

  it "detects EUR for Le Monde's IP" do
    expect(CurrencyByIP.new("195.154.120.129").currency).to eq("EUR")
  end

  it "detects GBP for BBC's IP" do
    expect(CurrencyByIP.new("212.58.244.18").currency).to eq("GBP")
  end
end