Add optional API key field for ollama.com cloud authentication

Fixes #18

Author: ivaigult

lib/Pages/settings_page/subwidgets/server_settings.dart

@@ -24,7 +24,10 @@ class _ServerSettingsState extends State<ServerSettings> {
   final _settingsBox = Hive.box('settings');
 
   final _serverAddressController = TextEditingController();
+  final _apiKeyController = TextEditingController();
+  final _apiKeyFocusNode = FocusNode();
 
+  bool _apiKeyObscured = true;
   OllamaRequestState _requestState = OllamaRequestState.uninitialized;
   get _isLoading => _requestState == OllamaRequestState.loading;
 
@@ -34,21 +37,36 @@ class _ServerSettingsState extends State<ServerSettings> {
   void initState() {
     super.initState();
 
+    _apiKeyFocusNode.addListener(() {
+      if (_apiKeyFocusNode.hasFocus) {
+        setState(() => _apiKeyObscured = false);
+      } else {
+        setState(() => _apiKeyObscured = true);
+      }
+    });
+
     _initialize();
   }
 
   _initialize() {
     final serverAddress = _settingsBox.get('serverAddress');
+    final apiKey = _settingsBox.get('apiKey');
 
     if (serverAddress != null) {
       _serverAddressController.text = serverAddress;
       _handleConnectButton();
     }
+
+    if (apiKey != null) {
+      _apiKeyController.text = apiKey;
+    }
   }
 
   @override
   void dispose() {
     _serverAddressController.dispose();
+    _apiKeyController.dispose();
+    _apiKeyFocusNode.dispose();
 
     super.dispose();
   }
@@ -89,6 +107,23 @@ class _ServerSettingsState extends State<ServerSettings> {
           },
         ),
         const SizedBox(height: 16),
+        TextField(
+          controller: _apiKeyController,
+          focusNode: _apiKeyFocusNode,
+          keyboardType: TextInputType.text,
+          obscureText: _apiKeyObscured,
+          onChanged: (value) {
+            _settingsBox.put('apiKey', value);
+          },
+          decoration: InputDecoration(
+            labelText: 'API key',
+            border: OutlineInputBorder(),
+          ),
+          onTapOutside: (PointerDownEvent event) {
+            FocusManager.instance.primaryFocus?.unfocus();
+          },
+        ),
+        const SizedBox(height: 16),
         SizedBox(
           width: double.infinity,
           child: Wrap(

lib/Providers/chat_provider.dart

@@ -390,9 +390,11 @@ class ChatProvider extends ChangeNotifier {
   void _updateOllamaServiceAddress() {
     final settingsBox = Hive.box('settings');
     _ollamaService.baseUrl = settingsBox.get('serverAddress');
+    _ollamaService.apiKey = settingsBox.get('apiKey');
 
-    settingsBox.listenable(keys: ["serverAddress"]).addListener(() {
+    settingsBox.listenable(keys: ["serverAddress", "apiKey"]).addListener(() {
       _ollamaService.baseUrl = settingsBox.get('serverAddress');
+      _ollamaService.apiKey = settingsBox.get('apiKey');
 
       // This will update empty chat state to dismiss "Tap to configure server address" message
       notifyListeners();

lib/Services/ollama_service.dart

@@ -22,8 +22,20 @@ class OllamaService {
   String get baseUrl => _baseUrl;
   set baseUrl(String? value) => _baseUrl = value ?? "http://localhost:11434";
 
+  /// Optional API key for authentication with ollama.com cloud API.
+  /// When set, requests will include an Authorization: Bearer header.
+  String? _apiKey;
+  String? get apiKey => _apiKey;
+  set apiKey(String? value) => _apiKey = value?.isNotEmpty == true ? value : null;
+
   /// The headers to include in all network requests.
-  final headers = {'Content-Type': 'application/json'};
+  Map<String, String> get headers {
+    final h = {'Content-Type': 'application/json'};
+    if (_apiKey != null) {
+      h['Authorization'] = 'Bearer $_apiKey';
+    }
+    return h;
+  }
 
   /// Creates a new instance of the Ollama service.
   OllamaService({String? baseUrl}) : _baseUrl = baseUrl ?? "http://localhost:11434";