macOS: Ability to import tunnels from file

For now, the open panel shows as a separate window.
Later, we'll open it as a sheet on the 'Manage tunnels' window.

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

WireGuard/WireGuard/UI/macOS/AppDelegate.swift

@@ -16,6 +16,8 @@ class AppDelegate: NSObject, NSApplicationDelegate {
             let tunnelsManager: TunnelsManager = result.value!
             let statusMenu = StatusMenu(tunnelsManager: tunnelsManager)
             self.statusItem = createStatusBarItem(with: statusMenu)
+
+            tunnelsManager.tunnelsListDelegate = statusMenu
         }
     }
 }

WireGuard/WireGuard/UI/macOS/ErrorPresenter.swift

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018 WireGuard LLC. All Rights Reserved.
+
+import Cocoa
+
+class ErrorPresenter: ErrorPresenterProtocol {
+    static func showErrorAlert(title: String, message: String, from sourceVC: AnyObject?, onPresented: (() -> Void)?, onDismissal: (() -> Void)?) {
+        let alert = NSAlert()
+        alert.messageText = title
+        alert.informativeText = message
+        onPresented?()
+        alert.runModal()
+        onDismissal?()
+    }
+}

WireGuard/WireGuard/UI/macOS/StatusMenu.swift

@@ -6,12 +6,16 @@ import Cocoa
 class StatusMenu: NSMenu {
 
     let tunnelsManager: TunnelsManager
+    var firstTunnelMenuItemIndex: Int = 0
 
     init(tunnelsManager: TunnelsManager) {
         self.tunnelsManager = tunnelsManager
         super.init(title: "WireGuard Status Bar Menu")
-        addTunnelMenuItems()
-        addItem(NSMenuItem.separator())
+        firstTunnelMenuItemIndex = numberOfItems
+        let isAdded = addTunnelMenuItems()
+        if isAdded {
+            addItem(NSMenuItem.separator())
+        }
         addTunnelManagementItems()
     }
 
@@ -19,14 +23,21 @@ class StatusMenu: NSMenu {
         fatalError("init(coder:) has not been implemented")
     }
 
-    func addTunnelMenuItems() {
+    func addTunnelMenuItems() -> Bool {
+        let numberOfTunnels = tunnelsManager.numberOfTunnels()
         for index in 0 ..< tunnelsManager.numberOfTunnels() {
             let tunnel = tunnelsManager.tunnel(at: index)
-            let menuItem = NSMenuItem(title: tunnel.name, action: #selector(tunnelClicked(sender:)), keyEquivalent: "")
-            menuItem.target = self
-            menuItem.representedObject = tunnel
+            let menuItem = createTunnelMenuItem(for: tunnel)
             addItem(menuItem)
         }
+        return numberOfTunnels > 0
+    }
+
+    func createTunnelMenuItem(for tunnel: TunnelContainer) -> NSMenuItem {
+        let menuItem = NSMenuItem(title: tunnel.name, action: #selector(tunnelClicked(sender:)), keyEquivalent: "")
+        menuItem.target = self
+        menuItem.representedObject = tunnel
+        return menuItem
     }
 
     @objc func tunnelClicked(sender: AnyObject) {
@@ -48,6 +59,47 @@ class StatusMenu: NSMenu {
     }
 
     @objc func importTunnelsClicked() {
-        print("Unimplemented")
+        let openPanel = NSOpenPanel()
+        openPanel.allowedFileTypes = ["conf", "zip"]
+        openPanel.begin { [weak tunnelsManager] response in
+            guard let tunnelsManager = tunnelsManager else { return }
+            guard response == .OK else { return }
+            guard let url = openPanel.url else { return }
+            TunnelImporter.importFromFile(url: url, into: tunnelsManager, sourceVC: nil, errorPresenterType: ErrorPresenter.self)
+        }
+    }
+}
+
+extension StatusMenu: TunnelsManagerListDelegate {
+    func tunnelAdded(at index: Int) {
+        let tunnel = tunnelsManager.tunnel(at: index)
+        let menuItem = createTunnelMenuItem(for: tunnel)
+        if tunnelsManager.numberOfTunnels() == 1 {
+            insertItem(NSMenuItem.separator(), at: firstTunnelMenuItemIndex + index)
+        }
+        insertItem(menuItem, at: firstTunnelMenuItemIndex + index)
+    }
+
+    func tunnelModified(at index: Int) {
+        let tunnel = tunnelsManager.tunnel(at: index)
+        if let menuItem = item(at: firstTunnelMenuItemIndex + index) {
+            menuItem.title = tunnel.name
+        }
+    }
+
+    func tunnelMoved(from oldIndex: Int, to newIndex: Int) {
+        let tunnel = tunnelsManager.tunnel(at: oldIndex)
+        let menuItem = createTunnelMenuItem(for: tunnel)
+        removeItem(at: firstTunnelMenuItemIndex + oldIndex)
+        insertItem(menuItem, at: firstTunnelMenuItemIndex + newIndex)
+    }
+
+    func tunnelRemoved(at index: Int) {
+        removeItem(at: firstTunnelMenuItemIndex + index)
+        if tunnelsManager.numberOfTunnels() == 0 {
+            if let firstItem = item(at: firstTunnelMenuItemIndex), firstItem.isSeparatorItem {
+                removeItem(at: firstTunnelMenuItemIndex)
+            }
+        }
     }
 }