56 lines
1.7 KiB
Ruby
56 lines
1.7 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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# Financial Benchmarks India (FBIL). Publishes daily reference exchange rates
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# for major currencies against the Indian rupee via a public JSON API.
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# Rates are expressed as INR per N units of foreign currency, where N is
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# extracted from the subProdName field (e.g. "INR / 100 JPY" means per 100).
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# Historical data available from 2018-07-10.
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class FBIL < Adapter
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BASE_URL = "https://www.fbil.org.in/wasdm/refrates/fetchfiltered"
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def fetch(after: nil, upto: nil)
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url = URI(BASE_URL)
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url.query = URI.encode_www_form(
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"fromDate" => after.to_s,
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"toDate" => (upto || Date.today).to_s,
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"authenticated" => "false",
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)
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response = Net::HTTP.get(url)
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parse(response)
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end
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def parse(json)
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data = json.is_a?(String) ? JSON.parse(json) : json
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return [] unless data.is_a?(Array)
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data.filter_map do |record|
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sub_prod = record["subProdName"]
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date_str = record["processRunDate"]
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rate_value = record["rate"]
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next unless sub_prod && date_str && rate_value.is_a?(Numeric)
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match = sub_prod.match(%r{INR / (\d+) ([A-Z]{3})})
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next unless match
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units = match[1].to_i
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currency = match[2]
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next if units.zero?
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adjusted_rate = rate_value / units.to_f
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next if adjusted_rate.zero?
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date = Date.parse(date_str)
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{ date:, base: currency, quote: "INR", rate: adjusted_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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