42 lines
1.1 KiB
Ruby
42 lines
1.1 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 Myanmar. Publishes daily reference exchange rates for 37
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# currencies against the Myanmar kyat (MMK) via a public JSON API. Rates are
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# expressed as MMK per 1 unit of foreign currency. No historical API is
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# available — only the latest rates are fetched.
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class CBM < Adapter
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BASE_URL = "https://forex.cbm.gov.mm/api/latest"
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def fetch(after: nil, upto: nil)
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response = Net::HTTP.get(URI(BASE_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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timestamp = data["timestamp"]
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rates = data["rates"]
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return [] unless timestamp && rates
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date = Time.at(Integer(timestamp)).utc.to_date
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rates.filter_map do |iso, value_str|
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next if iso == "MMK"
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rate_value = Float(value_str)
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next if rate_value.zero?
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{ date:, base: iso, quote: "MMK", rate: rate_value }
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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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