passepartout-apple/Passepartout-iOS/Global/HostImporter.swift

171 lines
6.5 KiB
Swift

//
// HostImporter.swift
// Passepartout-iOS
//
// Created by Davide De Rosa on 10/22/19.
// Copyright (c) 2019 Davide De Rosa. All rights reserved.
//
// https://github.com/passepartoutvpn
//
// This file is part of Passepartout.
//
// Passepartout 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 of the License, or
// (at your option) any later version.
//
// Passepartout 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 Passepartout. If not, see <http://www.gnu.org/licenses/>.
//
import Foundation
import PassepartoutCore
import TunnelKit
import SwiftyBeaver
private let log = SwiftyBeaver.self
class HostImporter {
private let service = TransientStore.shared.service
private weak var viewController: UIViewController?
private let configurationURL: URL
init(withConfigurationURL configurationURL: URL, parentViewController: UIViewController) {
self.configurationURL = configurationURL
log.debug("Parsing configuration URL: \(configurationURL)")
viewController = parentViewController
}
func importHost(withPassphrase passphrase: String?, removeOnError: Bool, removeOnCancel: Bool, completionHandler: @escaping (OpenVPN.ConfigurationParser.Result) -> Void) {
let result: OpenVPN.ConfigurationParser.Result
do {
result = try OpenVPN.ConfigurationParser.parsed(fromURL: configurationURL, passphrase: passphrase)
} catch let e as ConfigurationError {
switch e {
case .encryptionPassphrase, .unableToDecrypt(_):
enterPassphraseForHost(at: configurationURL, removeOnError: removeOnError, removeOnCancel: removeOnCancel, completionHandler: completionHandler)
default:
alertImportError(e, removeOnError: removeOnError)
}
return
} catch let e {
alertImportError(e, removeOnError: removeOnError)
return
}
if let warning = result.warning {
alertImportWarning(warning, removeOnCancel: removeOnCancel) {
completionHandler(result)
}
return
}
completionHandler(result)
}
private func alertImportError(_ error: Error, removeOnError: Bool) {
let message = HostImporter.localizedMessage(forError: error)
let alert = UIAlertController.asAlert(configurationURL.normalizedFilename, message)
alert.addCancelAction(L10n.Core.Global.ok)
viewController?.present(alert, animated: true, completion: nil)
if removeOnError {
try? FileManager.default.removeItem(at: configurationURL)
}
}
private func alertImportWarning(_ warning: ConfigurationError, removeOnCancel: Bool, completionHandler: @escaping () -> Void) {
let message = HostImporter.localizedDetailsMessage(forWarning: warning)
let alert = UIAlertController.asAlert(configurationURL.normalizedFilename, L10n.Core.ParsedFile.Alerts.PotentiallyUnsupported.message(message))
alert.addPreferredAction(L10n.Core.Global.ok) {
completionHandler()
}
alert.addCancelAction(L10n.Core.Global.cancel) {
if removeOnCancel {
try? FileManager.default.removeItem(at: self.configurationURL)
}
}
viewController?.present(alert, animated: true, completion: nil)
}
private func enterPassphraseForHost(at url: URL, removeOnError: Bool, removeOnCancel: Bool, completionHandler: @escaping (OpenVPN.ConfigurationParser.Result) -> Void) {
let alert = UIAlertController.asAlert(configurationURL.normalizedFilename, L10n.Core.ParsedFile.Alerts.EncryptionPassphrase.message)
alert.addTextField { (field) in
field.isSecureTextEntry = true
}
alert.addPreferredAction(L10n.Core.Global.ok) {
guard let passphrase = alert.textFields?.first?.text else {
return
}
self.importHost(
withPassphrase: passphrase,
removeOnError: removeOnError,
removeOnCancel: removeOnCancel,
completionHandler: completionHandler
)
}
alert.addCancelAction(L10n.Core.Global.cancel) {
if removeOnCancel {
try? FileManager.default.removeItem(at: url)
}
}
viewController?.present(alert, animated: true, completion: nil)
}
// MARK: Helpers
private static func localizedMessage(forError error: Error) -> String {
if let appError = error as? ConfigurationError {
switch appError {
case .malformed(let option):
log.error("Could not parse configuration URL: malformed option, \(option)")
return L10n.Core.ParsedFile.Alerts.Malformed.message(option)
case .missingConfiguration(let option):
log.error("Could not parse configuration URL: missing configuration, \(option)")
return L10n.Core.ParsedFile.Alerts.Missing.message(option)
case .unsupportedConfiguration(var option):
if option.contains("external") {
option.append(" (see FAQ)")
}
log.error("Could not parse configuration URL: unsupported configuration, \(option)")
return L10n.Core.ParsedFile.Alerts.Unsupported.message(option)
default:
break
}
}
log.error("Could not parse configuration URL: \(error)")
return L10n.Core.ParsedFile.Alerts.Parsing.message(error.localizedDescription)
}
private static func localizedDetailsMessage(forWarning warning: ConfigurationError) -> String {
switch warning {
case .malformed(let option):
return option
case .missingConfiguration(let option):
return option
case .unsupportedConfiguration(var option):
if option.contains("external") {
option.append(" (see FAQ)")
}
return option
default:
return "" // XXX: should never get here
}
}
}