Availibilty

SecretKit/SecretStore.swift

@@ -3,6 +3,7 @@ import Combine
 public protocol SecretStore: ObservableObject {
 
     associatedtype SecretType: Secret
+    var isAvailable: Bool { get }
     var name: String { get }
     var secrets: [SecretType] { get }
 
@@ -20,6 +21,7 @@ extension NSNotification.Name {
 public class AnySecretStore: SecretStore {
 
     fileprivate let base: Any
+    fileprivate let _isAvailable: () -> Bool
     fileprivate let _name: () -> String
     fileprivate let _secrets: () -> [AnySecret]
     fileprivate let _sign: (Data, AnySecret) throws -> Data
@@ -27,12 +29,17 @@ public class AnySecretStore: SecretStore {
 
     public init<T>(_ secretStore: T) where T: SecretStore {
         base = secretStore
+        _isAvailable = { secretStore.isAvailable }
         _name = { secretStore.name }
         _secrets = { secretStore.secrets.map { AnySecret($0) } }
         _sign = { try secretStore.sign(data: $0, with: $1 as! T.SecretType) }
         _delete = { try secretStore.delete(secret: $0 as! T.SecretType) }
     }
     
+    public var isAvailable: Bool {
+        return _isAvailable()
+    }
+
     public var name: String {
         return _name()
     }

SecretKit/SecureEnclave/SecureEnclaveStore.swift

@@ -1,10 +1,17 @@
 import Foundation
 import Security
+import CryptoTokenKit
 
 extension SecureEnclave {
 
     public class Store: SecretStore {
 
+        public var isAvailable: Bool {
+            // For some reason, as of build time, CryptoKit.SecureEnclave.isAvailable always returns false
+            // error msg "Received error sending GET UNIQUE DEVICE command"
+            // Verify it with TKTokenWatcher manually.
+            return TKTokenWatcher().tokenIDs.contains("com.apple.setoken")
+        }
         public let name = NSLocalizedString("Secure Enclave", comment: "Secure Enclave")
         @Published public fileprivate(set) var secrets: [Secret] = []
 

SecretKit/SmartCard/SmartCardStore.swift

@@ -9,6 +9,7 @@ extension SmartCard {
     public class Store: SecretStore {
 
         // TODO: Read actual smart card name, eg "YubiKey 5c"
+        @Published public var isAvailable: Bool = false
         public let name = NSLocalizedString("Smart Card", comment: "Smart Card")
         @Published public fileprivate(set) var secrets: [Secret] = []
         fileprivate let watcher = TKTokenWatcher()
@@ -21,10 +22,11 @@ extension SmartCard {
                 guard !string.contains("setoken") else { return }
                 self.id = string
                 self.reloadSecrets()
-                self.watcher.addRemovalHandler(self.reloadSecrets, forTokenID: string)
+                self.watcher.addRemovalHandler(self.smartcardRemoved, forTokenID: string)
             }
             if let id = id {
-                self.watcher.addRemovalHandler(self.reloadSecrets, forTokenID: id)
+                self.isAvailable = true
+                self.watcher.addRemovalHandler(self.smartcardRemoved, forTokenID: id)
             }
             loadSecrets()
         }
@@ -70,8 +72,14 @@ extension SmartCard {
 
 extension SmartCard.Store {
 
-    fileprivate func reloadSecrets(for tokenID: String? = nil) {
+    fileprivate func smartcardRemoved(for tokenID: String? = nil) {
+        id = nil
+        reloadSecrets()
+    }
+
+    fileprivate func reloadSecrets() {
         DispatchQueue.main.async {
+            self.isAvailable = self.id != nil
             self.secrets.removeAll()
             self.loadSecrets()
         }

Secretive/AppDelegate.swift

@@ -27,10 +27,12 @@ class AppDelegate: NSObject, NSApplicationDelegate {
         window.makeKeyAndOrderFront(nil)
         window.titleVisibility = .hidden
         window.toolbar = toolbar
+        if secureEnclave.isAvailable {
             let plus = NSTitlebarAccessoryViewController()
             plus.view = NSButton(image: NSImage(named: NSImage.addTemplateName)!, target: self, action: #selector(add(sender:)))
             plus.layoutAttribute = .right
             window.addTitlebarAccessoryViewController(plus)
+        }
         runSetupIfNeeded()
     }
 

Secretive/ContentView.swift

@@ -13,6 +13,7 @@ struct ContentView: View {
     var body: some View {
         NavigationView {
             List(selection: $active) {
+                if secureEnclave.isAvailable {
                     Section(header: Text(secureEnclave.name)) {
                         ForEach(secureEnclave.secrets) { secret in
                             NavigationLink(destination: SecretDetailView(secret: secret), tag: secret.id, selection: self.$active) {
@@ -24,6 +25,8 @@ struct ContentView: View {
                             }
                         }
                     }
+                }
+                if smartCard.isAvailable {
                     Section(header: Text(smartCard.name)) {
                         ForEach(smartCard.secrets) { secret in
                             NavigationLink(destination: SecretDetailView(secret: secret), tag: secret.id, selection: self.$active) {
@@ -31,6 +34,7 @@ struct ContentView: View {
                             }
                         }
                     }
+                }
             }.onAppear {
                 self.active = self.secureEnclave.secrets.first?.id ?? self.smartCard.secrets.first?.id
             }

Secretive/Preview Content/PreviewStore.swift

@@ -19,6 +19,7 @@ extension Preview {
 
     class Store: SecretStore, ObservableObject {
 
+        let isAvailable = true
         let name = "Preview Store"
         @Published var secrets: [Secret] = []