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

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

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
     }
 }