Add Sparkle update framework for macOS

macOS/Updates/UpdaterModel.swift

@@ -0,0 +1,41 @@
+import Defaults
+import Sparkle
+import SwiftUI
+
+final class UpdaterModel: ObservableObject {
+    @Published var canCheckForUpdates = false
+
+    private let updaterController: SPUStandardUpdaterController
+    private let updaterDelegate = UpdaterDelegate()
+
+    init() {
+        updaterController = SPUStandardUpdaterController(
+            startingUpdater: true,
+            updaterDelegate: updaterDelegate,
+            userDriverDelegate: nil
+        )
+
+        updaterController.updater.publisher(for: \.canCheckForUpdates)
+            .assign(to: &$canCheckForUpdates)
+    }
+
+    func checkForUpdates() {
+        updaterController.checkForUpdates(nil)
+    }
+
+    var automaticallyChecksForUpdates: Bool {
+        updaterController.updater.automaticallyChecksForUpdates
+    }
+
+    func setAutomaticallyChecksForUpdates(_ value: Bool) {
+        updaterController.updater.automaticallyChecksForUpdates = value
+    }
+}
+
+final class UpdaterDelegate: NSObject, SPUUpdaterDelegate {
+    @Default(.enableBetaChannel) private var enableBetaChannel
+
+    func allowedChannels(for _: SPUUpdater) -> Set<String> {
+        Set(enableBetaChannel ? ["beta"] : [])
+    }
+}