Fix text/plain NIP-05 response (& auto-prepend _@)

Show errors in toast

Closes #90

lib/models/user.dart

@@ -120,6 +120,11 @@ mixin UserAdapter on NostrAdapter<User> {
     return data.models;
   }
 
+  @override
+  bool isOfflineError(Object? error) {
+    return false;
+  }
+
   @override
   Future<User?> findOne(Object id,
       {bool remote = true,
@@ -131,24 +136,33 @@ mixin UserAdapter on NostrAdapter<User> {
       DataRequestLabel? label}) async {
     if (id.toString().isEmpty) return null;
 
-    String? publicKey = id.toString();
+    var publicKey = id.toString();
 
     if (publicKey.startsWith('npub')) {
       publicKey = publicKey.hexKey;
-    } else if (publicKey.contains('@')) {
-      final [username, domain] = id.toString().split('@');
+    } else {
+      // If it's not an npub we treat the string as NIP-05
+      if (!publicKey.contains('@')) {
+        // If it does not have a @, we treat the string as a domain name
+        publicKey = '_@$publicKey';
+      }
+
+      final [username, domain] = publicKey.split('@');
       publicKey = await sendRequest<dynamic>(
         Uri.parse('https://$domain/.well-known/nostr.json?name=$username'),
         onSuccess: (response, label) {
-          return (response.body as Map)['names']?[username];
+          var body = response.body;
+          if (body is String) {
+            body = jsonDecode(body);
+          }
+          return (body as Map)['names']?[username];
+        },
+        onError: (e, _) {
+          throw e;
         },
       );
     }
 
-    if (publicKey == null) {
-      return null;
-    }
-
     final req = RelayRequest(
       authors: {publicKey},
       kinds: {kind, if (params?['contacts'] != null) 3},

lib/widgets/app_drawer.dart

@@ -5,6 +5,7 @@ import 'package:gap/gap.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:zapstore/main.data.dart';
 import 'package:zapstore/models/settings.dart';
+import 'package:zapstore/utils/extensions.dart';
 import 'package:zapstore/widgets/rounded_image.dart';
 
 class LoginContainer extends HookConsumerWidget {
@@ -76,9 +77,13 @@ class LoginContainer extends HookConsumerWidget {
                       child: CircularProgressIndicator(),
                     ),
                     onPressed: () async {
-                      final user =
-                          await ref.users.findOne(controller.text.trim());
-                      ref.settings.findOneLocalById('_')!.user.value = user;
+                      return ref.users
+                          .findOne(controller.text.trim())
+                          .then((user) {
+                        ref.settings.findOneLocalById('_')!.user.value = user;
+                      }).catchError((e) {
+                        context.showError(e.toString());
+                      });
                     },
                     builder: (context, child, callback, buttonState) {
                       return Padding(