247 lines
9.2 KiB
Swift
247 lines
9.2 KiB
Swift
//
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// ZircleService.swift
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// Zircles
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//
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// Created by Francisco Gindre on 6/29/20.
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// Copyright © 2020 Electric Coin Company. All rights reserved.
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//
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import Foundation
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import Combine
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enum ZircleServiceError: Error {
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case generalError(message: String)
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}
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protocol ZircleService {
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func createNewZircle(name: String, goal zatoshi: Int64, frequency: ZircleFrequency, endDate: ZircleEndDate, spendingKey: String) throws -> Future<ZircleEntity, Error>
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func closeZircle(name: String) throws
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func contribute(zatoshi: Int64, zircle: ZircleEntity) throws
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func allOpenZircles() throws -> [ZircleEntity]?
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func allContributions(from zircle: ZircleEntity) -> Future<[ZircleOverallContribution],Error>
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func openInvite(_ url: URL) -> Future<Int,Error>
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}
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protocol ZircleOverallContribution {
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var from: String { get set }
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var zAddr: String { get set }
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var zatoshi: Int64 { get set }
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}
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protocol ZircleContribution {
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var from: String { get set }
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var zatoshi: Int64 { get set }
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var date: Date { get set }
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}
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protocol ZircleEntity {
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var name: String { get set}
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var goal: Int64 { get set }
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var frequency: Int {get set }
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var endDate: TimeInterval { get set }
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var accountIndex: Int {get set}
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var address: String {get set}
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}
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enum ZircleFrequency: Int {
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case daily = 0
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case weekly
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case monthly
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}
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enum ZircleEndDate {
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case onDate(date: Date)
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case atWill
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}
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struct ConcreteZircle: ZircleEntity {
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var name: String
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var goal: Int64
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var frequency: Int
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var endDate: TimeInterval
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var accountIndex: Int
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var address: String
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}
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import MnemonicSwift
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extension CombineSynchronizer: ZircleService {
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func closeZircle(name: String) throws {
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}
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func contribute(zatoshi: Int64, zircle: ZircleEntity) throws {
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}
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func allOpenZircles() throws -> [ZircleEntity]? {
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nil
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}
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func allContributions(from zircle: ZircleEntity) -> Future<[ZircleOverallContribution], Error> {
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Future<[ZircleOverallContribution], Error>() { promise in
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promise(.success([]))
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}
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}
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func openInvite(_ url: URL) -> Future<Int, Error> {
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Future<Int, Error>() { promise in
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promise(.success(-1))
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}
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}
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func createNewZircle(name: String, goal zatoshi: Int64, frequency: ZircleFrequency, endDate: ZircleEndDate, spendingKey: String) -> Future<ZircleEntity, Error> {
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Future<ZircleEntity, Error>() { promise in
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var storage = [AnyCancellable]()
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DispatchQueue.global().async { [weak self] in
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guard let self = self else { return }
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// Get latest height from chain and generate a mnemonic seed for this zircle
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Publishers.Zip(self.latestHeight(),
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Mnemonic.generatePublisher(strength: 256)
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).sink(receiveCompletion: { error in
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switch error {
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case .failure(let e):
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promise(.failure(e))
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default:
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break
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}
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}, receiveValue: { (height, seedPhrase) in
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guard let seedBytes = Mnemonic.deterministicSeedBytes(from: seedPhrase) else {
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promise(.failure(ZircleServiceError.generalError(message: "mnemonic bytes failed")))
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return
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}
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do {
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// start derivation
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let derivationHelper = self.initializer.keyDerivationHelper()
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// derive extended spending keys, and extended Viewing Keys
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guard let extendedSpendingKeys = try derivationHelper.deriveExtendedSpendingKeys(seed: seedBytes, accounts: 1),
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let extendedSpendingKey = extendedSpendingKeys.first,
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let extendedViewingKey = try derivationHelper.deriveExtendedFullViewingKey(extendedSpendingKey) else {
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promise(.failure(ZircleServiceError.generalError(message: "Key derivation error")))
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return
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}
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// import extended viewing key
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let accountIndex = try self.initializer.importExtendedFullViewingKey(extendedViewingKey)
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// get zAddr for this zircle
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guard let zAddr = self.initializer.getAddress(index: Int(accountIndex)) else {
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promise(.failure(ZircleServiceError.generalError(message: "coudn't get zAddr for account index: \(accountIndex)")))
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return
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}
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// set end date per input
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var end: TimeInterval = -1
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switch endDate {
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case .onDate(let date):
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end = date.timeIntervalSince1970
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default:
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break
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}
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// create zircle struct
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let zircle = ConcreteZircle(name: name,
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goal: zatoshi,
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frequency: frequency.rawValue,
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endDate: end,
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accountIndex: Int(accountIndex),
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address: zAddr)
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// get supporting wallet spending keys to create zircle
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guard let freq = CreateZircleMessage.ContributionFrequency(rawValue: zircle.frequency) else {
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promise(.failure(ZircleServiceError.generalError(message: "could not create frequency with value \(zircle.frequency)")))
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return
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}
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// create protobut message for the memo
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let createMessage = CreateZircleMessage.with { (createMsg) in
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createMsg.name = zircle.name
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createMsg.goal = UInt64(zircle.goal)
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createMsg.frequency = freq
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createMsg.end = UInt64(zircle.endDate)
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}
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// not sure if this is ok, but I don't have a data interface
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let memo = try createMessage.jsonString()
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// double check that the resulting data won't be truncated. this should be caught earlier on UI
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guard memo.utf8.count <= 512 else {
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promise(.failure(ZircleServiceError.generalError(message: "Zircle Message \"\(memo)\" is longer than 512 bytes - total: \(memo.utf8.count)")))
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return
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}
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// save before sending
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try SeedManager.default.saveKeys(name,
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phrase: seedPhrase,
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height: height,
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spendingKey: extendedSpendingKey)
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// fund zircle
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self.send(with: spendingKey,
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zatoshi: 1000,
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to: zAddr,
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memo: memo,
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from: 0)
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.sink { errorSubscriber in
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switch errorSubscriber {
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case .failure(let underlyingError):
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promise(.failure(underlyingError))
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default:
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break
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}
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} receiveValue: { (p) in
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promise(.success(zircle))
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}.store(in: &storage)
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} catch {
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promise(.failure(error))
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}
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}).store(in: &storage)
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}
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}
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}
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func allContributions(from zircle: ZircleEntity) throws -> [ZircleOverallContribution] {
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[]
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}
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func openInvite(_ url: URL) throws {
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}
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}
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extension Mnemonic {
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static func generatePublisher(strength: Int) -> Future<String, Error> {
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Future<String,Error>() { promise in
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DispatchQueue.global().async {
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guard let mnemonic = Mnemonic.generateMnemonic(strength: strength) else {
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promise(.failure(ZircleServiceError.generalError(message: "Error generating mnemonic")))
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return
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}
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promise(.success(mnemonic))
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}
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}
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}
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}
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