Import: Support for opening a .conf file in the app

Signed-off-by: Roopesh Chander <roop@roopc.net>

WireGuard/WireGuard/Model/Configuration.swift

@@ -5,7 +5,7 @@ import Foundation
 
 @available(OSX 10.14, iOS 12.0, *)
 class TunnelConfiguration: Codable {
-    let interface: InterfaceConfiguration
+    var interface: InterfaceConfiguration
     var peers: [PeerConfiguration] = []
     init(interface: InterfaceConfiguration) {
         self.interface = interface

WireGuard/WireGuard/UI/iOS/AppDelegate.swift

@@ -2,11 +2,13 @@
 // Copyright © 2018 WireGuard LLC. All rights reserved.
 
 import UIKit
+import os.log
 
 @UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate {
 
     var window: UIWindow?
+    var mainVC: MainViewController?
 
     func application(_ application: UIApplication,
                      didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
@@ -15,9 +17,25 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         window.backgroundColor = UIColor.white
         self.window = window
 
-        window.rootViewController = MainViewController()
+        let mainVC = MainViewController()
+        window.rootViewController = mainVC
         window.makeKeyAndVisible()
 
+        self.mainVC = mainVC
+
+        return true
+    }
+
+    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
+        // Based on importing code by Jeroen Leenarts <jeroen.leenarts@gmail.com> in commit 815f12c
+        defer {
+            do {
+                try FileManager.default.removeItem(at: url)
+            } catch {
+                os_log("Failed to remove item from Inbox: %{public}@", log: OSLog.default, type: .debug, url.absoluteString)
+            }
+        }
+        mainVC?.openForEditing(configFileURL: url)
         return true
     }
 }

WireGuard/WireGuard/UI/iOS/MainViewController.swift

@@ -4,6 +4,8 @@
 import UIKit
 
 class MainViewController: UISplitViewController {
+    var tunnelsListVC: TunnelsListTableViewController?
+
     override func loadView() {
         let detailVC = UIViewController()
         let detailNC = UINavigationController(rootViewController: detailVC)
@@ -14,6 +16,8 @@ class MainViewController: UISplitViewController {
         self.viewControllers = [ masterNC, detailNC ]
 
         super.loadView()
+
+        tunnelsListVC = masterVC
     }
 
     override func viewDidLoad() {
@@ -22,6 +26,10 @@ class MainViewController: UISplitViewController {
         // On iPad, always show both masterVC and detailVC, even in portrait mode, like the Settings app
         self.preferredDisplayMode = .allVisible
     }
+
+    func openForEditing(configFileURL: URL) {
+        tunnelsListVC?.openForEditing(configFileURL: configFileURL)
+    }
 }
 
 extension MainViewController: UISplitViewControllerDelegate {

WireGuard/WireGuard/UI/iOS/TunnelsListTableViewController.swift

@@ -6,6 +6,7 @@ import UIKit
 class TunnelsListTableViewController: UITableViewController {
 
     var tunnelsManager: TunnelsManager? = nil
+    var onTunnelsManagerReady: ((TunnelsManager) -> Void)? = nil
 
     init() {
         super.init(style: .plain)
@@ -28,6 +29,8 @@ class TunnelsListTableViewController: UITableViewController {
             if let s = self {
                 tunnelsManager.delegate = s
                 s.tunnelsManager = tunnelsManager
+                s.onTunnelsManagerReady?(tunnelsManager)
+                s.onTunnelsManagerReady = nil
                 s.tableView.reloadData()
             }
         }
@@ -40,10 +43,7 @@ class TunnelsListTableViewController: UITableViewController {
         alert.addAction(
             UIAlertAction(title: "Create from scratch", style: .default) { [weak self] (action) in
                 if let s = self, let tunnelsManager = s.tunnelsManager {
-                    let editVC = TunnelEditTableViewController(tunnelsManager: tunnelsManager)
+                    s.presentViewControllerForTunnelCreation(tunnelsManager: tunnelsManager, tunnelConfiguration: nil)
-                    editVC.delegate = s
-                    let editNC = UINavigationController(rootViewController: editVC)
-                    s.present(editNC, animated: true)
                 }
             }
         )
@@ -54,6 +54,41 @@ class TunnelsListTableViewController: UITableViewController {
         alert.popoverPresentationController?.barButtonItem = self.navigationItem.rightBarButtonItem
         self.present(alert, animated: true, completion: nil)
     }
+
+    func openForEditing(configFileURL: URL) {
+        let tunnelConfiguration: TunnelConfiguration?
+        let name = configFileURL.deletingPathExtension().lastPathComponent
+        do {
+            let fileContents = try String(contentsOf: configFileURL)
+            try tunnelConfiguration = WgQuickConfigFileParser.parse(fileContents)
+        } catch {
+            showErrorAlert(title: "Could not import config", message: "There was an error importing the config file")
+            return
+        }
+        tunnelConfiguration?.interface.name = name
+        if let tunnelsManager = tunnelsManager {
+            presentViewControllerForTunnelCreation(tunnelsManager: tunnelsManager, tunnelConfiguration: tunnelConfiguration)
+        } else {
+            onTunnelsManagerReady = { [weak self] tunnelsManager in
+                self?.presentViewControllerForTunnelCreation(tunnelsManager: tunnelsManager, tunnelConfiguration: tunnelConfiguration)
+            }
+        }
+    }
+
+    func presentViewControllerForTunnelCreation(tunnelsManager: TunnelsManager, tunnelConfiguration: TunnelConfiguration?) {
+        let editVC = TunnelEditTableViewController(tunnelsManager: tunnelsManager, tunnelConfiguration: tunnelConfiguration)
+        editVC.delegate = self
+        let editNC = UINavigationController(rootViewController: editVC)
+        self.present(editNC, animated: true)
+    }
+
+    func showErrorAlert(title: String, message: String) {
+        let okAction = UIAlertAction(title: "Ok", style: .default)
+        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
+        alert.addAction(okAction)
+
+        self.present(alert, animated: true, completion: nil)
+    }
 }
 
 // MARK: TunnelEditTableViewControllerDelegate