Statically load whether or not a key requires authentication before use (#357)

* Add protocol requirements

* Load auth settings.

* Updates.

* Update preview store

* Add lock icon

Sources/Secretive/Preview Content/PreviewStore.swift

@@ -11,6 +11,7 @@ extension Preview {
         let name: String
         let algorithm = Algorithm.ellipticCurve
         let keySize = 256
+        let requiresAuthentication: Bool = false
         let publicKey = UUID().uuidString.data(using: .utf8)!
 
     }
@@ -35,8 +36,12 @@ extension Preview {
             self.secrets.append(contentsOf: new)
         }
 
-        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance) throws -> SignedData {
-            return SignedData(data: data, requiredAuthentication: false)
+        func sign(data: Data, with secret: Preview.Secret, for provenance: SigningRequestProvenance) throws -> Data {
+            return data
+        }
+
+        func existingPersistedAuthenticationContext(secret: Preview.Secret) -> PersistedAuthenticationContext? {
+            nil
         }
 
         func persistAuthentication(secret: Preview.Secret, forDuration duration: TimeInterval) throws {

Sources/Secretive/Views/SecretListItemView.swift

@@ -20,7 +20,15 @@ struct SecretListItemView: View {
         )
 
         return NavigationLink(destination: SecretDetailView(secret: secret), tag: secret.id, selection: $activeSecret) {
-            Text(secret.name)
+            if secret.requiresAuthentication {
+                HStack {
+                    Text(secret.name)
+                    Spacer()
+                    Image(systemName: "lock")
+                }
+            } else {
+                Text(secret.name)
+            }
         }.contextMenu {
             if store is AnySecretStoreModifiable {
                 Button(action: { isRenaming = true }) {