Initial commit

SatsPrice/Network/CoinGeckoSpotPriceFetcher.swift

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+//
+//  CoinGeckoSpotPriceFetcher.swift
+//  SatsPrice
+//
+//  Created by Terry Yiu on 2/19/24.
+//
+
+import Foundation
+import BigDecimal
+
+private struct CoinGeckoSpotPriceResponse: Codable {
+    let bitcoin: CoinGeckoSpotPrice
+}
+
+private struct CoinGeckoSpotPrice: Codable {
+    let usd: Decimal
+}
+
+class CoinGeckoSpotPriceFetcher : SpotPriceFetcher {
+    private static let urlString = "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd&precision=18"
+
+    func btcToUsd() async throws -> BigDecimal? {
+        do {
+            guard let urlComponents = URLComponents(string: CoinGeckoSpotPriceFetcher.urlString), let url = urlComponents.url else {
+                return nil
+            }
+
+            let (data, _) = try await URLSession.shared.data(from: url, delegate: nil)
+
+            let spotPriceResponse = try JSONDecoder().decode(CoinGeckoSpotPriceResponse.self, from: data)
+            let spotPrice = spotPriceResponse.bitcoin
+
+            return BigDecimal(spotPrice.usd)
+        } catch {
+            return nil
+        }
+    }
+}