100 lines
2.7 KiB
Ruby
100 lines
2.7 KiB
Ruby
# frozen_string_literal: true
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require "net/http"
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require "ox"
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require "provider/adapters/adapter"
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class Provider
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module Adapters
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# Banco Central de Nicaragua. Publishes the daily official exchange rate
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# for the US dollar against the Nicaraguan córdoba via a SOAP web service.
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# The RecuperaTC_Mes method returns all daily rates for a given month.
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class BCN < Adapter
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ENDPOINT = URI("https://servicios.bcn.gob.ni/Tc_Servicio/ServicioTC.asmx")
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class << self
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def backfill_range = 30
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end
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def fetch(after: nil, upto: nil)
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check_tls_support!
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end_date = upto || Date.today
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dataset = []
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current = Date.new(after.year, after.month, 1)
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first = true
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while current <= end_date
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sleep(0.2) unless first
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first = false
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response = fetch_month(current.year, current.month)
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records = parse(response)
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dataset.concat(records.select { |r| r[:date].between?(after, end_date) })
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current = current.next_month
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end
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dataset
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end
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def parse(xml)
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xml = Ox.load(xml) if xml.is_a?(String)
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xml.locate("*/Tc").filter_map do |tc|
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date_str = tc.locate("Fecha").first&.text
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value_str = tc.locate("Valor").first&.text
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next unless date_str && value_str
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date = Date.parse(date_str)
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rate = Float(value_str)
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next if rate.zero?
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{ date:, base: "USD", quote: "NIO", rate: }
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end
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end
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private
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def fetch_month(year, month)
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body = soap_envelope(year, month)
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response = Net::HTTP.start(
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ENDPOINT.host,
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ENDPOINT.port,
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use_ssl: true,
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open_timeout: 15,
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read_timeout: 30,
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) do |http|
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req = Net::HTTP::Post.new(ENDPOINT)
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req["Content-Type"] = "text/xml; charset=utf-8"
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req["SOAPAction"] = '"http://servicios.bcn.gob.ni/RecuperaTC_Mes"'
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req.body = body
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http.request(req)
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end
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response.body
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end
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def check_tls_support!
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ctx = OpenSSL::SSL::SSLContext.new
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raise Unavailable, "legacy TLS required" if ctx.security_level > 0
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end
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def soap_envelope(year, month)
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<<~XML
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<?xml version="1.0" encoding="utf-8"?>
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<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
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xmlns:tns="http://servicios.bcn.gob.ni/">
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<soap:Body>
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<tns:RecuperaTC_Mes>
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<tns:Ano>#{year}</tns:Ano>
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<tns:Mes>#{month}</tns:Mes>
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</tns:RecuperaTC_Mes>
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</soap:Body>
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</soap:Envelope>
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XML
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end
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end
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end
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end
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