fix: 不正なホスト名でログイン試行ができないように

これの影響でApp Review でクラッシュしてrejectされた

Author: rinsuki

Sources/iOS/App/Screens/Login/AddAccountIndexView.swift

@@ -70,6 +70,21 @@ struct _AddAccountIndexView: View {
     @State var loginTask: Task<Void, Never>?
     @State var path: NavigationPath = .init()
     let errorReport: ((Error) -> Void)?
+    var instanceValidateError: String? {
+        if instance.isEmpty {
+            return ""
+        }
+        if instance.contains("/") {
+            return L10n.Login.ValidationFailed.hostIncludingSlash
+        }
+        var components = URLComponents()
+        components.scheme = "https"
+        components.host = instance
+        if components.url == nil {
+            return L10n.Login.ValidationFailed.hostIncludingSlash
+        }
+        return nil
+    }
 
     enum LoginState {
         case fetchingServerInfo
@@ -106,7 +121,7 @@ struct _AddAccountIndexView: View {
                     } label: {
                         Text(L10n.Login.loginButton)
                     }
-                    .disabled(instance.count == 0 || loginState != nil)
+                    .disabled(instanceValidateError != nil || loginState != nil)
                     .accessibility(identifier: "loginButton")
                     #if DEBUG
                     Button {
@@ -120,6 +135,8 @@ struct _AddAccountIndexView: View {
                 } footer: {
                     if let loginState = loginState {
                         Text(loginState.description)
+                    } else if let instanceValidateError {
+                        Text(instanceValidateError)
                     }
                 }
             }

Sources/iOS/Core/Generated/strings_ios.swift

@@ -289,6 +289,10 @@ public enum L10n {
       /// ログイン中
       public static let title = L10n.tr("Login", "progressDialog.title")
     }
+    public enum ValidationFailed {
+      /// ホスト名のみを入力してください (https:// や最後の / は含めないでください)
+      public static let hostIncludingSlash = L10n.tr("Login", "validationFailed.hostIncludingSlash")
+    }
     public enum Welcome {
       /// ようこそ、
       /// %@

Sources/iOS/Core/Strings/ja.lproj/Login.strings

@@ -8,6 +8,7 @@
 
 "title" = "ログイン";
 "pleaseInputMastodonInstance" = "Mastodonのインスタンスを入力してください";
+"validationFailed.hostIncludingSlash" = "ホスト名のみを入力してください (https:// や最後の / は含めないでください)";
 "loginButton" = "ログイン";
 
 "progressDialog.title" = "ログイン中";