Do not allow adding same topic again

ntfy/App/AppMain.swift

@@ -2,7 +2,6 @@ import SwiftUI
 import Firebase
 
 // TODO: Verify whether model version needs to be specified
-// TODO: Disallow adding same topic twice!!
 // TODO: Errors are not shown to the user, but instead just logged
 
 @main

ntfy/Views/NotificationListView.swift

@@ -1,4 +1,5 @@
 import SwiftUI
+import UniformTypeIdentifiers
 
 enum ActiveAlert {
     case clear, unsubscribe, selected
@@ -282,6 +283,10 @@ struct NotificationRowView: View {
             }
         }
         .padding(.all, 4)
+        .onTapGesture {
+            // TODO: This gives no feedback to the user, and it only works if the text is tapped
+            UIPasteboard.general.setValue(notification.formatMessage(), forPasteboardType: UTType.plainText.identifier)
+        }
     }
 }
 

ntfy/Views/SubscriptionAddView.swift

@@ -50,7 +50,14 @@ struct SubscriptionAddView: View {
     
     private func isValid(topic: String) -> Bool {
         let sanitizedTopic = sanitize(topic: topic)
-        return !sanitizedTopic.isEmpty && (sanitizedTopic.range(of: "^[-_A-Za-z0-9]{1,64}$", options: .regularExpression, range: nil, locale: nil) != nil)
+        if sanitizedTopic.isEmpty {
+            return false
+        } else if sanitizedTopic.range(of: "^[-_A-Za-z0-9]{1,64}$", options: .regularExpression, range: nil, locale: nil) == nil {
+            return false
+        } else if store.getSubscription(baseUrl: Config.appBaseUrl, topic: topic) != nil {
+            return false
+        }
+        return true
     }
     
     private func subscribeAction() {