Configurable zap amount

damus/Components/ZapButton.swift

@@ -52,8 +52,8 @@ struct ZapButton: View {
                 damus_state.lnurls.endpoints[target.pubkey] = payreq
             }
             
-            let tip_amount = get_default_tip_amount(pubkey: damus_state.pubkey)
-            guard let inv = await fetch_zap_invoice(payreq, zapreq: zapreq, amount: tip_amount) else {
+            let zap_amount = get_default_zap_amount(pubkey: damus_state.pubkey) ?? 1000
+            guard let inv = await fetch_zap_invoice(payreq, zapreq: zapreq, sats: zap_amount) else {
                 DispatchQueue.main.async {
                     zapping = false
                 }

damus/Models/UserSettingsStore.swift

@@ -16,15 +16,22 @@ func pk_setting_key(_ pubkey: String, key: String) -> String {
     return "\(pubkey)_\(key)"
 }
 
-let tip_amount_key = "default_tip_amount"
-func set_default_tip_amount(pubkey: String, amount: Int64) {
-    let key = pk_setting_key(pubkey, key: tip_amount_key)
+func default_zap_setting_key(pubkey: String) -> String {
+    return pk_setting_key(pubkey, key: "default_zap_amount")
+}
+
+func set_default_zap_amount(pubkey: String, amount: Int) {
+    let key = default_zap_setting_key(pubkey: pubkey)
     UserDefaults.standard.setValue(amount, forKey: key)
 }
 
-func get_default_tip_amount(pubkey: String) -> Int64 {
-    let key = "\(pubkey)_\(tip_amount_key)"
-    return UserDefaults.standard.object(forKey: key) as? Int64 ?? 1000000
+func get_default_zap_amount(pubkey: String) -> Int? {
+    let key = default_zap_setting_key(pubkey: pubkey)
+    let amt = UserDefaults.standard.integer(forKey: key)
+    if amt == 0 {
+        return nil
+    }
+    return amt
 }
 
 

damus/Util/Zap.swift

@@ -285,12 +285,13 @@ func fetch_static_payreq(_ lnurl: String) async -> LNUrlPayRequest? {
     return endpoint
 }
 
-func fetch_zap_invoice(_ payreq: LNUrlPayRequest, zapreq: NostrEvent, amount: Int64) async -> String? {
+func fetch_zap_invoice(_ payreq: LNUrlPayRequest, zapreq: NostrEvent, sats: Int) async -> String? {
     guard var base_url = payreq.callback.flatMap({ URLComponents(string: $0) }) else {
         return nil
     }
     
     let zappable = payreq.allowsNostr ?? false
+    let amount: Int64 = Int64(sats) * 1000
     
     var query = [URLQueryItem(name: "amount", value: "\(amount)")]
     

damus/Views/ConfigView.swift

@@ -21,6 +21,7 @@ struct ConfigView: View {
     @State var privkey_copied: Bool = false
     @State var pubkey_copied: Bool = false
     @State var delete_text: String = ""
+    @State var default_zap_amount: String
     
     @ObservedObject var settings: UserSettingsStore
     
@@ -28,6 +29,8 @@ struct ConfigView: View {
     
     init(state: DamusState) {
         self.state = state
+        let zap_amt = get_default_zap_amount(pubkey: state.pubkey).map({ "\($0)" }) ?? "1000"
+        _default_zap_amount = State(initialValue: zap_amt)
         _privkey = State(initialValue: self.state.keypair.privkey_bech32 ?? "")
         _settings = ObservedObject(initialValue: state.settings)
     }
@@ -124,6 +127,11 @@ struct ConfigView: View {
                         }
                     }
                 }
+                
+                
+                Section(NSLocalizedString("Default Zap Amount in sats", comment: "Section title for zap configuration")) {
+                    TextField("1000", text: $default_zap_amount)
+                }
 
                 Section(NSLocalizedString("Translations", comment: "Section title for selecting the translation service.")) {
                     Picker(NSLocalizedString("Service", comment: "Prompt selection of translation service provider."), selection: $settings.translation_service) {
@@ -194,6 +202,12 @@ struct ConfigView: View {
                 }
             }
         }
+        .onChange(of: default_zap_amount) { val in
+            guard let amt = Int(val) else {
+                return
+            }
+            set_default_zap_amount(pubkey: state.pubkey, amount: amt)
+        }
         .navigationTitle(NSLocalizedString("Settings", comment: "Navigation title for Settings view."))
         .navigationBarTitleDisplayMode(.large)
         .alert(NSLocalizedString("Permanently Delete Account", comment: "Alert for deleting the users account."), isPresented: $confirm_delete_account) {

damusTests/damusTests.swift

@@ -88,6 +88,14 @@ class damusTests: XCTestCase {
         XCTAssertEqual(parsed, expected)
     }
     
+    func testSaveDefaultZapAmount() {
+        let pubkey = "test_pubkey"
+        let amt = 1000
+        set_default_zap_amount(pubkey: pubkey, amount: amt)
+        let loaded = get_default_zap_amount(pubkey: pubkey)!
+        XCTAssertEqual(loaded, amt)
+    }
+    
     func testSaveRelayFilters() {
         var filters = Set<RelayFilter>()