48 lines
1.3 KiB
Ruby
48 lines
1.3 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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# Sveriges Riksbank. Fetches daily exchange rates for ~29 currencies
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# against the Swedish krona (SEK) via the SWEA API. Uses the ByGroup
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# endpoint (group 130) to fetch all currency series in a single request.
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# The ByGroup endpoint has a max 1-year date range.
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class RB < Adapter
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BASE_URL = "https://api.riksbank.se/swea/v1/Observations/ByGroup/130"
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class << self
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def backfill_range = 365
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end
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def fetch(after: nil, upto: nil)
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uri = URI("#{BASE_URL}/#{after}/#{upto || Date.today}")
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response = Net::HTTP.get(uri)
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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 |obs|
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series_id = obs["seriesId"]
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date_str = obs["date"]
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value = obs["value"]
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next unless series_id && date_str && value
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currency = series_id.delete_prefix("SEK").delete_suffix("PMI")
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next if currency == "ETT"
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rate = Float(value)
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next if rate.zero?
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{ date: Date.parse(date_str), base: currency, quote: "SEK", 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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