71 lines
1.9 KiB
Ruby
71 lines
1.9 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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# Banco de México. Fetches daily FIX and reference exchange rates for 5
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# currencies against the Mexican peso (MXN) via the SIE REST API.
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# Supports batched series queries and date range filtering.
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class BANXICO < Adapter
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BASE_URL = "https://www.banxico.org.mx/SieAPIRest/service/v1/series"
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# series_id => base currency (all quoted against MXN)
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SERIES = {
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"SF43718" => "USD",
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"SF46410" => "EUR",
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"SF46407" => "GBP",
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"SF46406" => "JPY",
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"SF60632" => "CAD",
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}.freeze
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class << self
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def api_key = ENV["BANXICO_API_KEY"] || raise(Adapter::Unavailable, "no API key")
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end
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def fetch(after: nil, upto: nil)
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ids = SERIES.keys.join(",")
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url = if after
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end_date = upto || Date.today
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URI("#{BASE_URL}/#{ids}/datos/#{after}/#{end_date}")
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else
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URI("#{BASE_URL}/#{ids}/datos")
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end
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response = Net::HTTP.start(url.host, url.port, use_ssl: true) do |http|
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request = Net::HTTP::Get.new(url)
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request["Bmx-Token"] = self.class.api_key
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http.request(request)
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end
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parse(response.body)
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end
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def parse(json)
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data = JSON.parse(json)
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series = data.dig("bmx", "series") || []
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series.flat_map do |s|
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base = SERIES[s["idSerie"]]
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next [] unless base
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(s["datos"] || []).filter_map do |obs|
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value = obs["dato"]&.tr(",", "")
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next unless value
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# Skip "N/E" (not available) values
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rate = Float(value, exception: false)
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next unless rate&.positive?
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date = Date.strptime(obs["fecha"], "%d/%m/%Y")
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{ date:, base:, quote: "MXN", rate: }
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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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