111 lines
3.5 KiB
Swift
111 lines
3.5 KiB
Swift
//
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// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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@objc
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public protocol PaymentsCurrencies: AnyObject {
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// Expressed as a ratio:
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//
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// price of fiat currency / price of payment currency (MobileCoin)
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typealias CurrencyConversionRate = Double
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var currentCurrencyCode: Currency.Code { get }
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func setCurrentCurrencyCode(_ currencyCode: Currency.Code, transaction: SDSAnyWriteTransaction)
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func updateConversationRatesIfStale()
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func warmCaches()
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}
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// MARK: -
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public protocol PaymentsCurrenciesSwift: PaymentsCurrencies {
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var preferredCurrencyInfos: [Currency.Info] { get }
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var supportedCurrencyInfos: [Currency.Info] { get }
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var supportedCurrencyInfosWithCurrencyConversions: [Currency.Info] { get }
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func conversionInfo(forCurrencyCode currencyCode: Currency.Code) -> CurrencyConversionInfo?
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}
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// MARK: -
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public struct CurrencyConversionInfo {
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public let currencyCode: Currency.Code
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public let name: String
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// Don't use this field; use convertToFiatCurrency() instead.
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private let conversionRate: PaymentsCurrencies.CurrencyConversionRate
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// How fresh is this conversion info?
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public let conversionDate: Date
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public init(currencyCode: Currency.Code,
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name: String,
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conversionRate: PaymentsCurrencies.CurrencyConversionRate,
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conversionDate: Date) {
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self.currencyCode = currencyCode
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self.name = name
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self.conversionRate = conversionRate
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self.conversionDate = conversionDate
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}
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public func convertToFiatCurrency(paymentAmount: TSPaymentAmount) -> Double? {
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guard paymentAmount.currency == .mobileCoin else {
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owsFailDebug("Unknown currency: \(paymentAmount.currency).")
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return nil
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}
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let mob = PaymentsConstants.convertPicoMobToMob(paymentAmount.picoMob)
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return conversionRate * mob
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}
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public func convertFromFiatCurrencyToMOB(_ value: Double) -> TSPaymentAmount {
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guard value >= 0 else {
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owsFailDebug("Invalid amount: \(value).")
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return TSPaymentAmount(currency: .mobileCoin, picoMob: 0)
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}
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let mob = value / conversionRate
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let picoMob = PaymentsConstants.convertMobToPicoMob(mob)
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return TSPaymentAmount(currency: .mobileCoin, picoMob: picoMob)
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}
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public var asCurrencyInfo: Currency.Info {
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Currency.Info(code: currencyCode, name: name)
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}
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public static func areEqual(_ left: CurrencyConversionInfo?,
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_ right: CurrencyConversionInfo?) -> Bool {
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return (left?.currencyCode == right?.currencyCode &&
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left?.conversionRate == right?.conversionRate)
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}
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}
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// MARK: -
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public class MockPaymentsCurrencies: NSObject, PaymentsCurrenciesSwift, PaymentsCurrencies {
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public let currentCurrencyCode: Currency.Code = PaymentsConstants.currencyCodeGBP
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public func setCurrentCurrencyCode(_ currencyCode: Currency.Code, transaction: SDSAnyWriteTransaction) {
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owsFail("Not implemented.")
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}
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public func warmCaches() {}
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public let preferredCurrencyInfos: [Currency.Info] = []
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public let supportedCurrencyInfos: [Currency.Info] = []
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public let supportedCurrencyInfosWithCurrencyConversions: [Currency.Info] = []
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public func updateConversationRatesIfStale() {}
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public func conversionInfo(forCurrencyCode currencyCode: Currency.Code) -> CurrencyConversionInfo? {
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return nil
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}
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}
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