macOS: Login item: Add a simple login item

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

WireGuard/WireGuard/UI/macOS/AppDelegate.swift

@@ -2,6 +2,7 @@
 // Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
 
 import Cocoa
+import ServiceManagement
 
 @NSApplicationMain
 class AppDelegate: NSObject, NSApplicationDelegate {
@@ -15,6 +16,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
 
     func applicationDidFinishLaunching(_ aNotification: Notification) {
         Logger.configureGlobal(tagged: "APP", withFilePath: FileManager.logFileURL?.path)
+        registerLoginItem(shouldLaunchAtLogin: true)
 
         TunnelsManager.create { [weak self] result in
             guard let self = self else { return }
@@ -42,6 +44,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
     }
 
     @objc func quit() {
+        registerLoginItem(shouldLaunchAtLogin: false)
         guard let currentTunnel = tunnelsTracker?.currentTunnel, currentTunnel.status == .active || currentTunnel.status == .activating else {
             NSApp.terminate(nil)
             return
@@ -74,3 +77,10 @@ extension AppDelegate: StatusMenuWindowDelegate {
         return manageTunnelsWindowObject!
     }
 }
+
+@discardableResult
+func registerLoginItem(shouldLaunchAtLogin: Bool) -> Bool {
+    let appId = Bundle.main.bundleIdentifier!
+    let helperBundleId = "\(appId).login-item-helper"
+    return SMLoginItemSetEnabled(helperBundleId as CFString, shouldLaunchAtLogin)
+}

WireGuard/WireGuard/UI/macOS/LoginItemHelper/Info.plist

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>ITSAppUsesNonExemptEncryption</key>
+	<false/>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>LSBackgroundOnly</key>
+	<true/>
+</dict>
+</plist>

WireGuard/WireGuard/UI/macOS/LoginItemHelper/LoginItemHelper.entitlements

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+</dict>
+</plist>

WireGuard/WireGuard/UI/macOS/LoginItemHelper/main.m

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
+
+#import <Cocoa/Cocoa.h>
+
+int main(int argc, char *argv[])
+{
+    NSURL *bundleURL = [NSBundle.mainBundle bundleURL];
+
+    // From <path>/WireGuard.app/Contents/Library/LoginItems/WireGuardLoginItemHelper.app, derive <path>/WireGuard.app
+    for (int i = 0; i < 4; ++i)
+        bundleURL = [bundleURL URLByDeletingLastPathComponent];
+
+    [NSWorkspace.sharedWorkspace launchApplication:[bundleURL path]];
+    return 0;
+}