tokenary/Encrypted Ink/WalletConnect.swift
2021-07-02 23:00:00 +03:00

160 lines
6.2 KiB
Swift

// Copyright © 2021 Encrypted Ink. All rights reserved.
import Foundation
import WalletConnect
class WalletConnect {
static let shared = WalletConnect()
private init() {}
private var interactors = [WCInteractor]()
private var peers = [String: WCPeerMeta]()
func sessionWithLink(_ link: String) -> WCSession? {
return WCSession.from(string: link)
}
func connect(session: WCSession, address: String, completion: @escaping ((Bool) -> Void)) {
let clientMeta = WCPeerMeta(name: "Encrypted Ink", url: "https://encrypted.ink")
let interactor = WCInteractor(session: session, meta: clientMeta, uuid: UUID())
let id = interactor.clientId
configure(interactor: interactor, address: address)
interactor.connect().done { connected in
completion(connected)
}.catch { [weak self] _ in
completion(false)
self?.removeInteractor(id: id)
}
interactors.append(interactor)
}
func killAllSessions() {
interactors.forEach {
$0.killSession().cauterize()
}
}
private func removeInteractor(id: String) {
interactors.removeAll(where: { $0.clientId == id })
peers.removeValue(forKey: id)
}
private func getPeerOfInteractor(_ interactor: WCInteractor?) -> WCPeerMeta? {
guard let id = interactor?.clientId else { return nil }
return peers[id]
}
private func configure(interactor: WCInteractor, address: String) {
let accounts = [address]
let chainId = 1
let id = interactor.clientId
interactor.onError = { _ in }
interactor.onSessionRequest = { [weak self, weak interactor] (id, peerParam) in
let peer = peerParam.peerMeta
if let id = interactor?.clientId {
self?.peers[id] = peer
}
interactor?.approveSession(accounts: accounts, chainId: chainId).cauterize()
}
interactor.onDisconnect = { [weak self] _ in
self?.removeInteractor(id: id)
}
interactor.eth.onSign = { [weak self, weak interactor] (id, payload) in
self?.approveSign(id: id, payload: payload, address: address, interactor: interactor)
}
interactor.eth.onTransaction = { [weak self, weak interactor] (id, event, transaction) in
self?.approveTransaction(id: id, wct: transaction, address: address, interactor: interactor)
}
}
private func approveTransaction(id: Int64, wct: WCEthereumTransaction, address: String, interactor: WCInteractor?) {
guard let to = wct.to else {
rejectRequest(id: id, interactor: interactor, message: "Something went wrong.")
return
}
let peer = getPeerOfInteractor(interactor)
let transaction = Transaction(from: wct.from, to: to, nonce: wct.nonce, gasPrice: wct.gasPrice, gas: wct.gas, value: wct.value, data: wct.data)
Agent.shared.showApprove(transaction: transaction, peerMeta: peer) { [weak self, weak interactor] transaction in
if let transaction = transaction {
self?.sendTransaction(transaction, address: address, requestId: id, interactor: interactor)
} else {
self?.rejectRequest(id: id, interactor: interactor, message: "Cancelled")
}
}
}
private func approveSign(id: Int64, payload: WCEthereumSignPayload, address: String, interactor: WCInteractor?) {
var message: String?
let title: String
switch payload {
case let .sign(data: data, raw: _):
message = String(data: data, encoding: .utf8)
title = "Sign Message"
case let .personalSign(data: data, raw: _):
message = String(data: data, encoding: .utf8)
title = "Sign Personal Message"
case let .signTypeData(id: _, data: _, raw: raw):
title = "Sign Typed Data"
if raw.count >= 2 {
message = raw[1]
}
}
let peer = getPeerOfInteractor(interactor)
Agent.shared.showApprove(title: title, meta: message ?? "", peerMeta: peer) { [weak self, weak interactor] approved in
if approved {
self?.sign(id: id, message: message, payload: payload, address: address, interactor: interactor)
} else {
self?.rejectRequest(id: id, interactor: interactor, message: "Cancelled")
}
}
}
private func rejectRequest(id: Int64, interactor: WCInteractor?, message: String) {
interactor?.rejectRequest(id: id, message: message).cauterize()
}
private func sendTransaction(_ transaction: Transaction, address: String, requestId: Int64, interactor: WCInteractor?) {
guard let account = AccountsService.getAccountForAddress(address) else {
rejectRequest(id: requestId, interactor: interactor, message: "Something went wrong.")
return
}
guard let hash = try? Ethereum.send(transaction: transaction, account: account) else {
rejectRequest(id: requestId, interactor: interactor, message: "Failed to send")
return
}
interactor?.approveRequest(id: requestId, result: hash).cauterize()
}
private func sign(id: Int64, message: String?, payload: WCEthereumSignPayload, address: String, interactor: WCInteractor?) {
guard let message = message, let account = AccountsService.getAccountForAddress(address) else {
rejectRequest(id: id, interactor: interactor, message: "Something went wrong.")
return
}
var signed: String?
switch payload {
case .personalSign:
signed = try? Ethereum.signPersonal(message: message, account: account)
case .signTypeData:
signed = try? Ethereum.sign(typedData: message, account: account)
case .sign:
signed = try? Ethereum.sign(message: message, account: account)
}
guard let result = signed else {
rejectRequest(id: id, interactor: interactor, message: "Something went wrong.")
return
}
interactor?.approveRequest(id: id, result: result).cauterize()
}
}