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/*
* This file is part of GNU Taler
* (C) 2021 Taler Systems S.A.
*
* GNU Taler is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 3, or (at your option) any later version.
*
* GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import Foundation
import iono
enum WalletBackendResponseError: Error {
case malformedResponse
}
protocol WalletBackendRequest {
associatedtype Args: Encodable
associatedtype Response: Decodable
func operation() -> String
func args() -> Args
func success(result: Response)
func error(_ err: WalletBackendResponseError)
}
fileprivate struct WalletBackendRequestData<T: WalletBackendRequest>: Encodable {
var operation: String
var id: UInt
var args: T.Args
init(request: T, id: UInt) {
operation = request.operation()
self.id = id
args = request.args()
}
}
fileprivate struct WalletBackendInitRequest: WalletBackendRequest {
struct RequestArgs: Encodable {
var persistentStoragePath: String
}
typealias Args = RequestArgs
struct Response: Codable {
struct SupportedProtocolVersions: Codable {
var exchange: String
var merchant: String
}
var supportedProtocolVersions: SupportedProtocolVersions
enum CodingKeys: String, CodingKey {
case supportedProtocolVersions = "supported_protocol_versions"
}
}
private var requestArgs: RequestArgs
private let success: () -> Void
init(persistentStoragePath: String, onSuccess: @escaping () -> Void) {
requestArgs = RequestArgs(persistentStoragePath: persistentStoragePath)
self.success = onSuccess
}
func operation() -> String {
return "init"
}
func args() -> Args {
return requestArgs
}
func success(result: Response) {
self.success()
}
func error(_ err: WalletBackendResponseError) {
}
}
fileprivate struct WalletBackendGetTransactionsRequest: WalletBackendRequest {
struct RequestArgs: Encodable {
}
typealias Args = RequestArgs
typealias Response = String
private var requestArgs: RequestArgs
init() {
requestArgs = RequestArgs()
}
func operation() -> String {
return "getTransactions"
}
func args() -> Args {
return requestArgs
}
func success(result: Response) {
}
func error(_ err: WalletBackendResponseError) {
}
}
struct WalletBackendGetBalancesRequest: WalletBackendRequest {
struct Balance: Decodable {
var available: Amount
var pendingIncoming: Amount
var pendingOutgoing: Amount
var requiresUserInput: Bool
}
struct BalancesResponse: Decodable {
var balances: [Balance]
}
struct RequestArgs: Encodable {
}
typealias Args = RequestArgs
typealias Response = BalancesResponse
private var requestArgs: RequestArgs
private let success: ([Balance]) -> Void
private let failure: () -> Void
init(onSuccess: @escaping ([Balance]) -> Void, onFailure: @escaping () -> Void) {
self.requestArgs = RequestArgs()
self.success = onSuccess
self.failure = onFailure
}
func operation() -> String {
return "getBalances"
}
func args() -> Args {
return requestArgs
}
func success(result: Response) {
print("balances???")
}
func error(_ err: WalletBackendResponseError) {
}
}
struct WalletBackendWithdrawTestBalance: WalletBackendRequest {
struct RequestArgs: Encodable {
var amount: String
var bankBaseUrl: String
var exchangeBaseUrl: String
}
typealias Args = RequestArgs
typealias Response = String
private var requestArgs: RequestArgs
init(amount: String, bankBaseUrl: String, exchangeBaseUrl: String) {
requestArgs = RequestArgs(amount: amount, bankBaseUrl: bankBaseUrl, exchangeBaseUrl: exchangeBaseUrl)
}
func operation() -> String {
return "withdrawTestBalance"
}
func args() -> Args {
return requestArgs
}
func success(result: Response) {
}
func error(_ err: WalletBackendResponseError) {
}
}
enum WalletBackendError: Error {
case serializationError
case deserializationError
}
class WalletBackend: IonoMessageHandler {
private var iono: Iono
private var requestsMade: UInt
private var backendReady: Bool
private var backendReadyCondition: NSCondition
private struct RequestDetail {
let decodeSuccess: (Data) -> Void
//let handleError: (Data) -> Void
}
private var requests: [UInt : RequestDetail] = [:]
init() {
iono = Iono()
requestsMade = 0
self.backendReady = false
self.backendReadyCondition = NSCondition()
iono.messageHandler = self
let js_path = URL(fileURLWithPath: Bundle.main.path(forResource: "taler-wallet-embedded", ofType: "js")!)
do {
let js = try String(contentsOf: js_path, encoding: .utf8)
iono.putModuleCode(modName: "@gnu-taler/taler-wallet-embedded", code: js)
iono.evalNodeCode(source: "require('iono');")
iono.evalNodeCode(source: "tw = require('@gnu-taler/taler-wallet-embedded');")
iono.evalNodeCode(source: "tw.installNativeWalletListener();")
} catch {
}
// Send the init message
let documentUrls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
if (documentUrls.count > 0) {
var storageDir = documentUrls[0]
storageDir.appendPathComponent("talerwalletdb-v30", isDirectory: false)
storageDir.appendPathExtension("json")
try! sendRequest(request: WalletBackendInitRequest(persistentStoragePath: storageDir.path, onSuccess: {
self.backendReady = true
self.backendReadyCondition.broadcast()
}))
}
waitUntilReady()
//try! sendRequest(request: WalletBackendWithdrawTestBalance(amount: "TESTKUDOS:10", bankBaseUrl: "https://bank.test.taler.net/", exchangeBaseUrl: "https://exchange.test.taler.net/"))
try! sendRequest(request: WalletBackendGetBalancesRequest(onSuccess: { ([WalletBackendGetBalancesRequest.Balance]) -> Void in
}, onFailure: { () -> Void in
}))
}
func waitUntilReady() {
backendReadyCondition.lock()
while (!self.backendReady) {
backendReadyCondition.wait()
}
backendReadyCondition.unlock()
}
func handleMessage(message: String) {
print(message)
do {
guard let messageData = message.data(using: .utf8) else { throw WalletBackendError.deserializationError }
let data = try JSONSerialization.jsonObject(with: messageData, options: .allowFragments) as? [String : Any]
if let responseData = data {
let type = (responseData["type"] as? String) ?? ""
if type == "response" {
guard let id = responseData["id"] as? UInt else { /* TODO: error. */ return }
guard let request = requests[id] else { /* TODO: error. */ return }
request.decodeSuccess(messageData)
requests[id] = nil
} else if type == "tunnelHttp" {
} else if type == "notification" {
} else if type == "error" {
guard let id = responseData["id"] as? UInt else { /* TODO: error. */ return }
guard let request = requests[id] else { /* TODO: error. */ return }
//request.handleError(messageData)
requests[id] = nil
} else {
/* TODO: unknown response type. */
}
}
} catch {
}
}
private struct FullResponse<T: WalletBackendRequest>: Decodable {
let type: String
let operation: String
let id: UInt
let result: T.Response
}
/*private struct FullError: Decodable {
let type: String
let operation: String
let id: UInt
let error: WalletErrorDetail
}*/
func sendRequest<T: WalletBackendRequest>(request: T) throws {
let data = WalletBackendRequestData<T>(request: request, id: requestsMade)
requestsMade += 1
let decodeSuccess = { (data: Data) -> Void in
do {
let decoded = try JSONDecoder().decode(FullResponse<T>.self, from: data)
request.success(result: decoded.result)
} catch {
}
}
/* Encode the request and send it to the backend. */
do {
let encoded = try JSONEncoder().encode(data)
guard let jsonString = String(data: encoded, encoding: .utf8) else { throw WalletBackendError.serializationError }
let detail = RequestDetail(decodeSuccess: decodeSuccess)
requests[data.id] = detail
iono.sendMessage(message: jsonString)
} catch {
throw WalletBackendError.serializationError
}
}
}
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