lib/models/keys.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/material.dart';
 import 'package:nostr_tools/nostr_tools.dart';
 
 class Keys {
@@ -11,3 +12,6 @@ class Keys {
 class Relay {
   static final relay = RelayApi(relayUrl: 'wss://relay.damus.io');
 }
+
+final keyController = TextEditingController();
+final formKey = GlobalKey<FormFieldState>();

lib/pages/home_screen/home_screen_widget.dart

@@ -372,7 +372,7 @@ class _CreatePostState extends State<CreatePost> {
                       padding: const EdgeInsets.symmetric(vertical: 24),
                       decoration: BoxDecoration(
                         borderRadius: BorderRadius.circular(12),
-                        color: AppColors.mainDarkBlue,
+                        color: AppColors.background,
                       ),
                       child: const Center(
                         child: Text(

lib/pages/login_screen/login_screen.dart

@@ -0,0 +1,153 @@
+import 'package:dart_nostr/dart_nostr.dart';
+import 'package:drifter/models/keys.dart';
+import 'package:drifter/pages/home_screen/widgets/message_text_button_widget.dart';
+
+import 'package:drifter/pages/profile_screen/widgets/keys_option_modal_bottom_sheet.dart';
+import 'package:drifter/pages/profile_screen/widgets/message_snack_bar.dart';
+import 'package:drifter/pages/profile_screen/widgets/ok_button_widget.dart';
+
+import 'package:drifter/theme/app_colors.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:nostr_tools/nostr_tools.dart';
+
+class LoginScreen extends StatelessWidget {
+  const LoginScreen({super.key});
+
+  final _secureStorage = const FlutterSecureStorage();
+
+  Future<bool> addKeyToStorage(
+    String privateKeyHex,
+    String publicKeyHex,
+    String nsecKey,
+    String npubKey,
+  ) async {
+// Waiting for both write operations to complete
+    Future.wait([
+      _secureStorage.write(key: 'privateKey', value: privateKeyHex),
+      _secureStorage.write(key: 'publicKey', value: privateKeyHex),
+      _secureStorage.write(key: 'nsec', value: nsecKey),
+      _secureStorage.write(key: 'npub', value: npubKey),
+    ]);
+
+    // Updating status variables and starting widget rebuilding
+
+// Returns a boolean value indicating whether the keys were successfully added to the repository or not.
+    return Keys.keysExist;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView(
+      children: [
+        SizedBox(
+          height: 200,
+        ),
+        Padding(
+          padding: const EdgeInsets.all(16.0),
+          child: Column(
+            children: [
+              const Text(
+                'Enter your private key',
+                style: TextStyle(
+                  fontSize: 20,
+                ),
+              ),
+              const SizedBox(height: 30),
+              TextFormField(
+                  decoration: const InputDecoration(
+                    labelText: 'Enter nsec or hex',
+                    border: OutlineInputBorder(),
+                  ),
+                  maxLength: 64,
+                  controller: keyController,
+                  key: formKey,
+                  validator: (value) {
+                    if (value == null || value.isEmpty) {
+                      return 'Please enter your private key';
+                    }
+                    try {
+                      bool isValidHexKey =
+                          Nostr.instance.keysService.isValidPrivateKey(value);
+                      bool isValidNSec = value.trim().startsWith('nsec') &&
+                          Nostr.instance.keysService.isValidPrivateKey(
+                              NostrClientUtils.hexEncode(value)['data']);
+                      if (!(isValidHexKey || isValidNSec)) {
+                        return 'Your private key is not valid.';
+                      }
+                    } on ChecksumVerificationException catch (e) {
+                      return e.message;
+                    } catch (e) {
+                      return 'Error: $e';
+                    }
+                    return null;
+                  }),
+            ],
+          ),
+        ),
+        SizedBox(height: 20),
+        Padding(
+          padding: const EdgeInsets.all(16.0),
+          child: ElevatedButton(
+            style: ButtonStyle(
+                backgroundColor:
+                    MaterialStateProperty.all(AppColors.background)),
+            onPressed: () {
+              if (formKey.currentState!.validate()) {
+                // Он получает значение закрытого ключа из _keyController текстового поля и присваивает его переменной privateKeyHex.
+                String privateKeyHex = keyController.text.trim();
+                String publicKeyHex;
+                String nsecKey;
+                String npubKey;
+
+                // Он проверяет, начинается ли строка privateKeyHex со строки « nsec », что указывает на то, что она может быть в формате NIP-19. Если это так, он декодирует метод privateKeyHex using _nip19.decode(privateKeyHex) для получения поля « данные », которое представляет фактический закрытый ключ в шестнадцатеричном формате.
+                if (privateKeyHex.startsWith('nsec')) {
+                  nsecKey = privateKeyHex;
+                  final decoded = Nostr.instance.keysService
+                      .decodeNsecKeyToPrivateKey(privateKeyHex);
+                  privateKeyHex = decoded;
+                  publicKeyHex = Nostr.instance.keysService
+                      .derivePublicKey(privateKey: 'privateKeyHex');
+                  npubKey = Nostr.instance.keysService
+                      .encodePublicKeyToNpub(publicKeyHex);
+                }
+                // Если privateKeyHex не начинается с « nsec », это означает, что это обычный шестнадцатеричный закрытый ключ.
+                else {
+                  publicKeyHex = Nostr.instance.keysService
+                      .derivePublicKey(privateKey: 'privateKeyHex');
+                  nsecKey = Nostr.instance.keysService
+                      .encodePrivateKeyToNsec(privateKeyHex);
+                  npubKey = Nostr.instance.keysService
+                      .encodePublicKeyToNpub(publicKeyHex);
+                }
+
+                // Затем он вызывает _addKeysToStorage метод для добавления закрытого ключа и открытого ключа в хранилище. Он прикрепляет then() к этому методу обратный вызов для обработки случая, когда ключи успешно добавлены в хранилище.
+                addKeyToStorage(privateKeyHex, publicKeyHex, nsecKey, npubKey)
+                    .then((keysAdded) {
+                  if (keysAdded) {
+                    keyController.clear();
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      MessageSnackBar(label: 'Congratulations! Keys Stored!'),
+                    );
+                    setState() {
+                      Keys.privateKey = privateKeyHex;
+                      Keys.publicKey = publicKeyHex;
+                      Keys.nsecKey = nsecKey;
+                      Keys.npubKey = npubKey;
+                      Keys.keysExist = true;
+                    }
+                  }
+                });
+              } else {
+                formKey.currentState?.setState(() {});
+              }
+            },
+            child: Text(
+              'Login',
+            ),
+          ),
+        )
+      ],
+    );
+  }
+}

lib/pages/main_screen/main_screen_widget.dart

@@ -1,5 +1,6 @@
 // import 'package:drifter/pages/home_screen/home_screen_widget.dart';
 import 'package:drifter/pages/home_screen/home_screen_widget.dart';
+import 'package:drifter/pages/login_screen/login_screen.dart';
 import 'package:drifter/pages/message_screen/message_screen_widget.dart';
 import 'package:drifter/pages/profile_screen/profile_screen.dart';
 import 'package:drifter/theme/app_colors.dart';
@@ -58,6 +59,7 @@ class _MainScreenWidgetState extends State<MainScreenWidget> {
           HomeScreen(),
           MessageScreen(),
           ProfileScreen(),
+          LoginScreen(),
         ],
       ),
       bottomNavigationBar: BottomNavigationBar(
@@ -75,6 +77,10 @@ class _MainScreenWidgetState extends State<MainScreenWidget> {
             icon: Icon(Icons.person),
             label: 'Profile',
           ),
+          BottomNavigationBarItem(
+            icon: Icon(Icons.login),
+            label: 'Login',
+          ),
         ],
         onTap: onSelectedtap,
       ),

lib/pages/profile_screen/profile_screen.dart

@@ -37,8 +37,8 @@ class ProfileScreenState extends State<ProfileScreen> {
 
     final nsec =
         Nostr.instance.keysService.encodePrivateKeyToNsec(newPrivateKey);
-    final nsecDecoded =
-        Nostr.instance.keysService.decodeNsecKeyToPrivateKey(nsec);
+    // final nsecDecoded =
+    //     Nostr.instance.keysService.decodeNsecKeyToPrivateKey(nsec);
     // assert(nsecDecoded['type'] == 'nsec');
     // assert(nsecDecoded['data'] == newPrivateKey);
 
@@ -47,12 +47,12 @@ class ProfileScreenState extends State<ProfileScreen> {
     // final newPublicKey = keyGenerator.getPublicKey(newPrivateKey);
 
     final npub = Nostr.instance.keysService.encodePublicKeyToNpub(newPublicKey);
-    final npubDecoded =
-        Nostr.instance.keysService.decodeNpubKeyToPublicKey(npub);
+    // final npubDecoded =
+    //     Nostr.instance.keysService.decodeNpubKeyToPublicKey(npub);
     // assert(npubDecoded['type'] == 'npub');
     // assert(npubDecoded['data'] == newPublicKey);
 
-    return await _addKeyToStorage(newPrivateKey, newPublicKey, nsec, npub);
+    return await addKeyToStorage(newPrivateKey, newPublicKey, nsec, npub);
   }
 
   Future<void> _getKeysFromStorage() async {
@@ -80,7 +80,7 @@ class ProfileScreenState extends State<ProfileScreen> {
 
   // Adding a new key
 // Writing a private and public key to a secure vault
-  Future<bool> _addKeyToStorage(
+  Future<bool> addKeyToStorage(
     String privateKeyHex,
     String publicKeyHex,
     String nsecKey,
@@ -89,7 +89,7 @@ class ProfileScreenState extends State<ProfileScreen> {
 // Waiting for both write operations to complete
     Future.wait([
       _secureStorage.write(key: 'privateKey', value: privateKeyHex),
-      _secureStorage.write(key: 'publicKey', value: privateKeyHex),
+      _secureStorage.write(key: 'publicKey', value: publicKeyHex),
       _secureStorage.write(key: 'nsec', value: nsecKey),
       _secureStorage.write(key: 'npub', value: npubKey),
     ]);
@@ -150,8 +150,8 @@ class ProfileScreenState extends State<ProfileScreen> {
               Keys.keysExist
                   ? ElevatedButton(
                       style: ButtonStyle(
-                          backgroundColor: MaterialStateProperty.all(
-                              AppColors.mainDarkBlue)),
+                          backgroundColor:
+                              MaterialStateProperty.all(AppColors.background)),
                       onPressed: () {
                         keysExistDialog(
                           Nostr.instance.keysService
@@ -166,8 +166,8 @@ class ProfileScreenState extends State<ProfileScreen> {
                     )
                   : ElevatedButton(
                       style: ButtonStyle(
-                          backgroundColor: MaterialStateProperty.all(
-                              AppColors.mainDarkBlue)),
+                          backgroundColor:
+                              MaterialStateProperty.all(AppColors.background)),
                       onPressed: () {
                         modalBottomSheet();
                       },

lib/pages/profile_screen/widgets/key_exist_dialog.dart

@@ -43,7 +43,7 @@ class _KeysExistDialogState extends State<KeysExistDialog> {
               padding: const EdgeInsets.symmetric(vertical: 24),
               decoration: BoxDecoration(
                 borderRadius: BorderRadius.circular(12),
-                color: AppColors.mainDarkBlue,
+                color: AppColors.background,
               ),
               child: const Center(
                 child: Text(

lib/pages/profile_screen/widgets/ok_button_widget.dart

@@ -16,7 +16,7 @@ class OkButton extends StatelessWidget {
     return ElevatedButton(
       onPressed: onPressed,
       style: ElevatedButton.styleFrom(
-        backgroundColor: AppColors.mainDarkBlue,
+        backgroundColor: AppColors.background,
         shape: RoundedRectangleBorder(
           borderRadius: BorderRadius.circular(8),
         ),

pubspec.yaml

@@ -63,7 +63,7 @@ flutter:
 
   # To add assets to your application, add an assets section, like this:
   assets:
-    - assets/
+    - assets/images/logo/
   #   - images/a_dot_ham.jpeg
 
   # An image asset can refer to one or more resolution-specific "variants", see