commit adac2bcd64429071c36925dc3a5b95c4d59f0b18 Author: Terry Yiu <963907+tyiu@users.noreply.github.com> Date: Mon Feb 19 01:58:22 2024 -0500 Initial commit diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..936451d --- /dev/null +++ b/README.md @@ -0,0 +1,15 @@ +# SatsPrice + +This app fetches the price of Bitcoin relative to the United States Dollar from multiple sources, and converts inputted amounts between Sats, BTC, and USD. + +## Notes + +Precision is attempted to be kept up to 20 digits. + +When NaN is displayed, it means "not a number", which can be caused by invalid input or problems fetching the price of Bitcoin from the selected source. + +## Attribution + +The [Bitcoin Calculator](https://www.flaticon.com/free-icons/bitcoin-calculator) icon was created by Icon home and licensed as free for personal and commercial use with attribution. + +This project depends on [BigDecimal](https://github.com/mgriebling/BigDecimal), an MIT-licensed package for providing arbitrary-precision and fixed-precision decimal arithmetic in Swift. diff --git a/SatsPrice.xcodeproj/project.pbxproj 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b/SatsPrice/Assets.xcassets/AppIcon.appiconset/bitcoin-calculator-64.png differ diff --git a/SatsPrice/Assets.xcassets/Contents.json b/SatsPrice/Assets.xcassets/Contents.json new file mode 100644 index 0000000..73c0059 --- /dev/null +++ b/SatsPrice/Assets.xcassets/Contents.json @@ -0,0 +1,6 @@ +{ + "info" : { + "author" : "xcode", + "version" : 1 + } +} diff --git a/SatsPrice/ContentView.swift b/SatsPrice/ContentView.swift new file mode 100644 index 0000000..55bac21 --- /dev/null +++ b/SatsPrice/ContentView.swift @@ -0,0 +1,122 @@ +// +// ContentView.swift +// SatsPrice +// +// Created by Terry Yiu on 2/19/24. +// + +import SwiftUI +import BigDecimal + +struct ContentView: View { + @ObservedObject private var satsViewModel = SatsViewModel() + + @State private var spotPriceSource: SpotPriceSource = .coinbase + + private let dateFormatter = DateFormatter() + + private let spotPriceFetcherDelegator = SpotPriceFetcherDelegator() + + init() { + dateFormatter.dateStyle = .short + dateFormatter.timeStyle = .short + } + + @MainActor + func updatePrice() async { + do { + guard let price = try await spotPriceFetcherDelegator.btcToUsd() else { + satsViewModel.btcToUsdString = "" + return + } + + satsViewModel.btcToUsdString = "\(price)" + } catch { + satsViewModel.btcToUsdString = "" + } + satsViewModel.lastUpdated = Date.now + } + + var body: some View { + Form { + Section { + Picker("Price Source", selection: $spotPriceSource) { + ForEach(SpotPriceSource.allCases, id: \.self) { + Text($0.description) + } + } + .onChange(of: spotPriceSource) { newSpotPriceSource in + spotPriceFetcherDelegator.spotPriceSource = newSpotPriceSource + Task { + await updatePrice() + } + } + + HStack { + TextField("", text: $satsViewModel.btcToUsdString) + .disabled(true) + Button(action: { + Task { + await updatePrice() + } + }) { + Image(systemName: "arrow.clockwise") + } + } + } header: { + Text("1 BTC to USD") + } footer: { + Text("Last updated: \(dateFormatter.string(from: satsViewModel.lastUpdated))") + } + +#if os(iOS) + Section { + TextField("", text: $satsViewModel.satsString) + .keyboardType(.numberPad) + } header: { + Text("Sats") + } + + Section { + TextField("", text: $satsViewModel.btcString) + .keyboardType(.decimalPad) + } header: { + Text("BTC") + } + + Section { + TextField("", text: $satsViewModel.usdString) + .keyboardType(.decimalPad) + } header: { + Text("USD") + } +#else + Section { + TextField("", text: $satsViewModel.satsString) + } header: { + Text("Sats") + } + + Section { + TextField("", text: $satsViewModel.btcString) + } header: { + Text("BTC") + } + + Section { + TextField("", text: $satsViewModel.usdString) + } header: { + Text("USD") + } +#endif + } + .task { + await updatePrice() + } + .formStyle(.grouped) + } +} + +#Preview { + ContentView() +} diff --git a/SatsPrice/Network/CoinGeckoSpotPriceFetcher.swift b/SatsPrice/Network/CoinGeckoSpotPriceFetcher.swift new file mode 100644 index 0000000..79d9e7b --- /dev/null +++ b/SatsPrice/Network/CoinGeckoSpotPriceFetcher.swift @@ -0,0 +1,38 @@ +// +// 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 + } + } +} diff --git a/SatsPrice/Network/CoinbaseSpotPriceFetcher.swift b/SatsPrice/Network/CoinbaseSpotPriceFetcher.swift new file mode 100644 index 0000000..4ef94cc --- /dev/null +++ b/SatsPrice/Network/CoinbaseSpotPriceFetcher.swift @@ -0,0 +1,46 @@ +// +// CoinbaseSpotPriceFetcher.swift +// SatsPrice +// +// Created by Terry Yiu on 2/19/24. +// + +import Foundation +import BigDecimal + +private struct CoinbaseSpotPriceResponse: Codable { + let data: CoinbaseSpotPrice +} + +private struct CoinbaseSpotPrice: Codable { + let amount: String + let base: String + let currency: String +} + +class CoinbaseSpotPriceFetcher : SpotPriceFetcher { + private static let urlString = "https://api.coinbase.com/v2/prices/BTC-USD/spot" + private static let btc = "BTC" + private static let usd = "USD" + + func btcToUsd() async throws -> BigDecimal? { + do { + guard let urlComponents = URLComponents(string: CoinbaseSpotPriceFetcher.urlString), let url = urlComponents.url else { + return nil + } + + let (data, _) = try await URLSession.shared.data(from: url, delegate: nil) + + let coinbaseSpotPriceResponse = try JSONDecoder().decode(CoinbaseSpotPriceResponse.self, from: data) + let coinbaseSpotPrice = coinbaseSpotPriceResponse.data + + guard coinbaseSpotPrice.base == CoinbaseSpotPriceFetcher.btc && coinbaseSpotPrice.currency == CoinbaseSpotPriceFetcher.usd else { + return nil + } + + return BigDecimal(coinbaseSpotPrice.amount) + } catch { + return nil + } + } +} diff --git a/SatsPrice/Network/SpotPriceFetcher.swift b/SatsPrice/Network/SpotPriceFetcher.swift new file mode 100644 index 0000000..5aabf4f --- /dev/null +++ b/SatsPrice/Network/SpotPriceFetcher.swift @@ -0,0 +1,13 @@ +// +// SpotPriceFetcher.swift +// SatsPrice +// +// Created by Terry Yiu on 2/19/24. +// + +import Foundation +import BigDecimal + +protocol SpotPriceFetcher { + func btcToUsd() async throws -> BigDecimal? +} diff --git a/SatsPrice/Network/SpotPriceFetcherDelegator.swift b/SatsPrice/Network/SpotPriceFetcherDelegator.swift new file mode 100644 index 0000000..aed6d16 --- /dev/null +++ b/SatsPrice/Network/SpotPriceFetcherDelegator.swift @@ -0,0 +1,29 @@ +// +// SpotPriceFetcherDelegator.swift +// SatsPrice +// +// Created by Terry Yiu on 2/20/24. +// + +import Foundation +import BigDecimal + +class SpotPriceFetcherDelegator: SpotPriceFetcher { + private let coinbaseSpotPriceFetcher = CoinbaseSpotPriceFetcher() + private let coinGeckoSpotPriceFetcher = CoinGeckoSpotPriceFetcher() + + var spotPriceSource: SpotPriceSource = .coinbase + + private var delegate: SpotPriceFetcher { + switch spotPriceSource { + case .coinbase: + coinbaseSpotPriceFetcher + case .coingecko: + coinGeckoSpotPriceFetcher + } + } + + func btcToUsd() async throws -> BigDecimal? { + return try await delegate.btcToUsd() + } +} diff --git a/SatsPrice/Preview Content/Preview Assets.xcassets/Contents.json b/SatsPrice/Preview Content/Preview Assets.xcassets/Contents.json new file mode 100644 index 0000000..73c0059 --- /dev/null +++ b/SatsPrice/Preview Content/Preview Assets.xcassets/Contents.json @@ -0,0 +1,6 @@ +{ + "info" : { + "author" : "xcode", + "version" : 1 + } +} diff --git a/SatsPrice/SatsPrice.entitlements b/SatsPrice/SatsPrice.entitlements new file mode 100644 index 0000000..ee95ab7 --- /dev/null +++ b/SatsPrice/SatsPrice.entitlements @@ -0,0 +1,10 @@ + + + + + com.apple.security.app-sandbox + + com.apple.security.network.client + + + diff --git a/SatsPrice/SatsPrice.xcdatamodeld/.xccurrentversion b/SatsPrice/SatsPrice.xcdatamodeld/.xccurrentversion new file mode 100644 index 0000000..3f39f17 --- /dev/null +++ b/SatsPrice/SatsPrice.xcdatamodeld/.xccurrentversion @@ -0,0 +1,8 @@ + + + + + _XCCurrentVersionName + SatsPrice.xcdatamodel + + diff --git a/SatsPrice/SatsPrice.xcdatamodeld/SatsPrice.xcdatamodel/contents b/SatsPrice/SatsPrice.xcdatamodeld/SatsPrice.xcdatamodel/contents new file mode 100644 index 0000000..9ed2921 --- /dev/null +++ b/SatsPrice/SatsPrice.xcdatamodeld/SatsPrice.xcdatamodel/contents @@ -0,0 +1,9 @@ + + + + + + + + + \ No newline at end of file diff --git a/SatsPrice/SatsPriceApp.swift b/SatsPrice/SatsPriceApp.swift new file mode 100644 index 0000000..1317949 --- /dev/null +++ b/SatsPrice/SatsPriceApp.swift @@ -0,0 +1,17 @@ +// +// SatsPriceApp.swift +// SatsPrice +// +// Created by Terry Yiu on 2/19/24. +// + +import SwiftUI + +@main +struct SatsPriceApp: App { + var body: some Scene { + WindowGroup { + ContentView() + } + } +} diff --git a/SatsPrice/SatsViewModel.swift b/SatsPrice/SatsViewModel.swift new file mode 100644 index 0000000..2c5a528 --- /dev/null +++ b/SatsPrice/SatsViewModel.swift @@ -0,0 +1,67 @@ +// +// SatsViewModel.swift +// SatsPrice +// +// Created by Terry Yiu on 2/19/24. +// + +import Foundation +import BigDecimal + +class SatsViewModel: ObservableObject { + @Published private(set) var btcToUsd: BigDecimal = BigDecimal.nan + @Published var lastUpdated: Date = Date.now + + @Published private(set) var sats: BigDecimal = 0 + @Published private(set) var btc: BigDecimal = 0 + @Published private(set) var usd: BigDecimal = 0 + + var btcToUsdString: String { + get { btcToUsd.asString(.plain) } + set { + self.btcToUsd = BigDecimal(newValue) + self.usd = btc.multiply(btcToUsd, Rounding(.down, 20)) + } + } + + var satsString: String { + get { sats.asString(.plain) } + set { + self.sats = BigDecimal(newValue) + + let preciseDivide = sats.divide(100000000) + if preciseDivide.isNaN { + self.btc = sats.divide(100000000, Rounding(.down, 20)) + } else { + self.btc = sats.divide(100000000) + } + + self.usd = btc.multiply(btcToUsd, Rounding(.down, 20)) + } + } + + var btcString: String { + get { btc.asString(.plain) } + set { + self.btc = BigDecimal(newValue) + self.sats = btc.multiply(100000000, Rounding(.down, 20)) + self.usd = btc.multiply(btcToUsd, Rounding(.down, 20)) + } + } + + var usdString: String { + get { usd.asString(.plain) } + set { + self.usd = BigDecimal(newValue) + + let preciseDivide = usd.divide(btcToUsd) + if preciseDivide.isNaN { + self.btc = usd.divide(btcToUsd, Rounding(.down, 20)) + } else { + self.btc = usd.divide(btcToUsd) + } + + self.sats = btc.multiply(100000000, Rounding(.down, 20)) + } + } +} diff --git a/SatsPrice/SpotPriceSource.swift b/SatsPrice/SpotPriceSource.swift new file mode 100644 index 0000000..361b6c7 --- /dev/null +++ b/SatsPrice/SpotPriceSource.swift @@ -0,0 +1,22 @@ +// +// SpotPriceSource.swift +// SatsPrice +// +// Created by Terry Yiu on 2/20/24. +// + +import Foundation + +enum SpotPriceSource: CaseIterable, CustomStringConvertible { + case coinbase + case coingecko + + var description: String { + switch self { + case .coinbase: + "Coinbase" + case .coingecko: + "CoinGecko" + } + } +} diff --git a/SatsPriceTests/SatsPriceTests.swift b/SatsPriceTests/SatsPriceTests.swift new file mode 100644 index 0000000..751f057 --- /dev/null +++ b/SatsPriceTests/SatsPriceTests.swift @@ -0,0 +1,35 @@ +// +// SatsPriceTests.swift +// SatsPriceTests +// +// Created by Terry Yiu on 2/19/24. +// + +import XCTest + +final class SatsPriceTests: XCTestCase { + + override func setUpWithError() throws { + // Put setup code here. This method is called before the invocation of each test method in the class. + } + + override func tearDownWithError() throws { + // Put teardown code here. This method is called after the invocation of each test method in the class. + } + + func testExample() throws { + // This is an example of a functional test case. + // Use XCTAssert and related functions to verify your tests produce the correct results. + // Any test you write for XCTest can be annotated as throws and async. + // Mark your test throws to produce an unexpected failure when your test encounters an uncaught error. + // Mark your test async to allow awaiting for asynchronous code to complete. Check the results with assertions afterwards. + } + + func testPerformanceExample() throws { + // This is an example of a performance test case. + measure { + // Put the code you want to measure the time of here. + } + } + +} diff --git a/SatsPriceTests/SatsViewModelTests.swift b/SatsPriceTests/SatsViewModelTests.swift new file mode 100644 index 0000000..867e787 --- /dev/null +++ b/SatsPriceTests/SatsViewModelTests.swift @@ -0,0 +1,72 @@ +// +// SatsViewModelTests.swift +// SatsPriceTests +// +// Created by Terry Yiu on 2/19/24. +// + +import XCTest +import BigDecimal +@testable import SatsPrice + +final class SatsViewModelTests: XCTestCase { + + override func setUpWithError() throws { + // Put setup code here. This method is called before the invocation of each test method in the class. + } + + override func tearDownWithError() throws { + // Put teardown code here. This method is called after the invocation of each test method in the class. + } + + func testSatsViewModel() { + let satsViewModel = SatsViewModel() + satsViewModel.btcToUsdString = "54321" + + // Test BTC updates. + satsViewModel.btcString = "1" + XCTAssertEqual(satsViewModel.btc, BigDecimal("1")) + XCTAssertEqual(satsViewModel.btcString, "1") + XCTAssertEqual(satsViewModel.sats, BigDecimal("100000000")) + XCTAssertEqual(satsViewModel.satsString, "100000000") + XCTAssertEqual(satsViewModel.usd, BigDecimal("54321")) + XCTAssertEqual(satsViewModel.usdString, "54321") + + // Test Sats updates. + satsViewModel.satsString = "200000000" + XCTAssertEqual(satsViewModel.btc, BigDecimal("2")) + XCTAssertEqual(satsViewModel.btcString, "2") + XCTAssertEqual(satsViewModel.sats, BigDecimal("200000000")) + XCTAssertEqual(satsViewModel.satsString, "200000000") + XCTAssertEqual(satsViewModel.usd, BigDecimal("108642")) + XCTAssertEqual(satsViewModel.usdString, "108642") + + // Test USD updates. + satsViewModel.usdString = "162963" + XCTAssertEqual(satsViewModel.btc, BigDecimal("3")) + XCTAssertEqual(satsViewModel.btcString, "3") + XCTAssertEqual(satsViewModel.sats, BigDecimal("300000000")) + XCTAssertEqual(satsViewModel.satsString, "300000000") + XCTAssertEqual(satsViewModel.usd, BigDecimal("162963")) + XCTAssertEqual(satsViewModel.usdString, "162963") + + // Test fractional amounts. + satsViewModel.usdString = "1" + XCTAssertEqual(satsViewModel.btc, BigDecimal("0.000018409086725207562452")) + XCTAssertEqual(satsViewModel.btcString, "0.000018409086725207562452") + XCTAssertEqual(satsViewModel.sats, BigDecimal("1840.9086725207562452")) + XCTAssertEqual(satsViewModel.satsString, "1840.9086725207562452") + XCTAssertEqual(satsViewModel.usd, BigDecimal("1")) + XCTAssertEqual(satsViewModel.usdString, "1") + + // Test large amounts that exceed the cap of 21M BTC. + satsViewModel.usdString = "11407419999999" + XCTAssertEqual(satsViewModel.btc, BigDecimal("210000184.09084884298")) + XCTAssertEqual(satsViewModel.btcString, "210000184.09084884298") + XCTAssertEqual(satsViewModel.sats, BigDecimal("21000018409084884.298")) + XCTAssertEqual(satsViewModel.satsString, "21000018409084884.298") + XCTAssertEqual(satsViewModel.usd, BigDecimal("11407419999999")) + XCTAssertEqual(satsViewModel.usdString, "11407419999999") + } + +} diff --git a/SatsPriceUITests/SatsPriceUITests.swift b/SatsPriceUITests/SatsPriceUITests.swift new file mode 100644 index 0000000..3320e60 --- /dev/null +++ b/SatsPriceUITests/SatsPriceUITests.swift @@ -0,0 +1,41 @@ +// +// SatsPriceUITests.swift +// SatsPriceUITests +// +// Created by Terry Yiu on 2/19/24. +// + +import XCTest + +final class SatsPriceUITests: XCTestCase { + + override func setUpWithError() throws { + // Put setup code here. This method is called before the invocation of each test method in the class. + + // In UI tests it is usually best to stop immediately when a failure occurs. + continueAfterFailure = false + + // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this. + } + + override func tearDownWithError() throws { + // Put teardown code here. This method is called after the invocation of each test method in the class. + } + + func testExample() throws { + // UI tests must launch the application that they test. + let app = XCUIApplication() + app.launch() + + // Use XCTAssert and related functions to verify your tests produce the correct results. + } + + func testLaunchPerformance() throws { + if #available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 7.0, *) { + // This measures how long it takes to launch your application. + measure(metrics: [XCTApplicationLaunchMetric()]) { + XCUIApplication().launch() + } + } + } +} diff --git a/SatsPriceUITests/SatsPriceUITestsLaunchTests.swift b/SatsPriceUITests/SatsPriceUITestsLaunchTests.swift new file mode 100644 index 0000000..5fbea58 --- /dev/null +++ b/SatsPriceUITests/SatsPriceUITestsLaunchTests.swift @@ -0,0 +1,32 @@ +// +// SatsPriceUITestsLaunchTests.swift +// SatsPriceUITests +// +// Created by Terry Yiu on 2/19/24. +// + +import XCTest + +final class SatsPriceUITestsLaunchTests: XCTestCase { + + override class var runsForEachTargetApplicationUIConfiguration: Bool { + true + } + + override func setUpWithError() throws { + continueAfterFailure = false + } + + func testLaunch() throws { + let app = XCUIApplication() + app.launch() + + // Insert steps here to perform after app launch but before taking a screenshot, + // such as logging into a test account or navigating somewhere in the app + + let attachment = XCTAttachment(screenshot: app.screenshot()) + attachment.name = "Launch Screen" + attachment.lifetime = .keepAlways + add(attachment) + } +}