95 lines
2.7 KiB
Ruby
95 lines
2.7 KiB
Ruby
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# frozen_string_literal: true
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require "json"
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require "net/http"
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require "provider/adapters/adapter"
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class Provider
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module Adapters
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# Central Bank of the Republic of Turkey.
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# Uses EVDS3 bulk API with buying (A) and selling (S) rates in TRY.
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# Each currency's mid-market rate is derived from the average of buy/sell.
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# Requires TCMB_API_KEY environment variable.
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class TCMB < Adapter
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EVDS_URL = "https://evds3.tcmb.gov.tr/igmevdsms-dis"
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# Buy/sell rates in TRY for each currency. Hardcoded because the EVDS3 catalog API doesn't expose
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# a clean list and the series rarely change.
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# Browse: https://evds3.tcmb.gov.tr > Exchange Rates > Indicative Exchange Rates
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CURRENCIES = [
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"AED",
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"AUD",
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"AZN",
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"CAD",
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"CHF",
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"CNY",
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"DKK",
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"EUR",
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"GBP",
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"JPY",
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"KRW",
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"KWD",
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"KZT",
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"NOK",
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"PKR",
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"QAR",
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"RON",
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"RUB",
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"SAR",
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"SEK",
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"USD",
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].freeze
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SERIES = CURRENCIES.flat_map do |c|
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[["#{c}_BUY", "TP.DK.#{c}.A.YTL"], ["#{c}_SELL", "TP.DK.#{c}.S.YTL"]]
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end.to_h.freeze
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COLUMNS = SERIES.to_h { |code, series| [series.tr(".", "_"), code] }.freeze
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class << self
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def api_key = ENV["TCMB_API_KEY"] || raise(Adapter::Unavailable, "no API key")
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def backfill_range = 730
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end
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def fetch(after: nil, upto: nil)
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start_date = after || Date.new(2012, 1, 2)
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end_date = upto || Date.today
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url = URI("#{EVDS_URL}/series=#{SERIES.values.join("-")}" \
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"&startDate=#{start_date.strftime("%d-%m-%Y")}" \
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"&endDate=#{end_date.strftime("%d-%m-%Y")}" \
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"&type=json&frequency=1")
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response = Net::HTTP.get(url, "key" => self.class.api_key)
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data = JSON.parse(response)
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items = data["items"] || []
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items.flat_map do |item|
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date = Date.strptime(item["Tarih"], "%d-%m-%Y")
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raw = {}
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COLUMNS.each do |column, code|
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value = item[column]
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next if value.nil?
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raw[code] = Float(value)
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end
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# Mid of buying and selling for each currency → X→TRY rate
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# JPY is quoted per 100 units in TCMB data (confirmed via series metadata)
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CURRENCIES.filter_map do |currency|
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buy = raw["#{currency}_BUY"]
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sell = raw["#{currency}_SELL"]
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next unless buy && sell
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rate = (buy + sell) / 2
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rate /= 100.0 if currency == "JPY"
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{ date:, base: currency, quote: "TRY", rate: rate.round(4) }
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end
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end
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end
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end
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end
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end
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