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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
protocol WalletBackendRequest {
associatedtype Args: Encodable
func operation() -> String
func args() -> Args
}
fileprivate struct WalletBackendRequestData<T: WalletBackendRequest>: Encodable {
var operation: String
var id: Int
var args: T.Args
init(request: T, id: Int) {
operation = request.operation()
self.id = id
args = request.args()
}
}
fileprivate struct WalletBackendInitRequest: WalletBackendRequest {
struct RequestArgs: Encodable {
var persistentStoragePath: String
}
typealias Args = RequestArgs
private var requestArgs: RequestArgs
init(persistentStoragePath: String) {
requestArgs = RequestArgs(persistentStoragePath: persistentStoragePath)
}
func operation() -> String {
return "init"
}
func args() -> Args {
return requestArgs
}
}
fileprivate struct WalletBackendGetTransactionsRequest: WalletBackendRequest {
struct RequestArgs: Encodable {
}
typealias Args = RequestArgs
private var requestArgs: RequestArgs
init() {
requestArgs = RequestArgs()
}
func operation() -> String {
return "getTransactions"
}
func args() -> Args {
return requestArgs
}
}
enum WalletBackendError: Error {
case serializationError
}
class WalletBackend: IonoMessageHandler {
private var iono: Iono
private var requestsMade: Int
init() {
iono = Iono()
requestsMade = 0
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))
}
//try! sendRequest(request: WalletBackendGetTransactionsRequest())
}
func handleMessage(message: String) {
print("received message \(message)")
}
func sendRequest<T: WalletBackendRequest>(request: T) throws {
let data = WalletBackendRequestData<T>(request: request, id: requestsMade)
requestsMade += 1
do {
let encoded = try JSONEncoder().encode(data)
guard let jsonString = String(data: encoded, encoding: .utf8) else { throw WalletBackendError.serializationError }
iono.sendMessage(message: jsonString)
} catch {
throw WalletBackendError.serializationError
}
}
}
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