93 lines
2.9 KiB
Swift
93 lines
2.9 KiB
Swift
// This is free software: you can redistribute and/or modify it
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// under the terms of the GNU General Public License 3.0
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// as published by the Free Software Foundation https://fsf.org
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//
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// CoinGeckoPriceFetcher.swift
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// SatsPrice
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//
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// Created by Terry Yiu on 2/19/24.
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//
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import Foundation
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private struct CoinGeckoPriceResponse: Codable {
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#if !SKIP
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let bitcoin: [String: Decimal]
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#else
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let bitcoin: [String: String]
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#endif
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}
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class CoinGeckoPriceFetcher : PriceFetcher {
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func urlString(toCurrency currency: Locale.Currency) -> String {
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"https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=\(currency.identifier.lowercased())&precision=18"
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}
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func urlString(toCurrencies currencies: [Locale.Currency]) -> String {
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let currenciesString = currencies.map { $0.identifier.lowercased() }.joined(separator: ",")
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return "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=\(currenciesString)&precision=18"
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}
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func convertBTC(toCurrency currency: Locale.Currency) async throws -> Decimal? {
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do {
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guard let urlComponents = URLComponents(string: urlString(toCurrency: currency)), let url = urlComponents.url else {
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return nil
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}
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let (data, _) = try await URLSession.shared.data(from: url, delegate: nil)
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let priceResponse = try JSONDecoder().decode(CoinGeckoPriceResponse.self, from: data)
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guard let price = priceResponse.bitcoin[currency.identifier.lowercased()] else {
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return nil
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}
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#if !SKIP
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return price
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#else
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return Decimal(price)
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#endif
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} catch {
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return nil
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}
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}
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func convertBTC(toCurrencies currencies: [Locale.Currency]) async throws -> [Locale.Currency : Decimal] {
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do {
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guard !currencies.isEmpty else {
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return [:]
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}
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if currencies.count == 1, let currency = currencies.first {
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guard let price = try await convertBTC(toCurrency: currency) else {
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return [:]
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}
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return [currency: price]
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}
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guard let urlComponents = URLComponents(string: urlString(toCurrencies: currencies)), let url = urlComponents.url else {
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return [:]
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}
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let (data, _) = try await URLSession.shared.data(from: url, delegate: nil)
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let priceResponse = try JSONDecoder().decode(CoinGeckoPriceResponse.self, from: data)
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var results: [Locale.Currency : Decimal] = [:]
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for currency in currencies {
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if let price = priceResponse.bitcoin[currency.identifier] {
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#if !SKIP
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results[currency] = price
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#else
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results[currency] = Decimal(price)
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#endif
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}
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}
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return results
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} catch {
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return [:]
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}
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}
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}
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