feat: add option to import/export keystore (#776)

* feat: add option to import/export keystore

* change the order of import/export keystore buttons

* feat: add option to change the keystore password

lib/ui/views/settings/settingsFragment/settings_manage_keystore_password.dart

@@ -0,0 +1,84 @@
+// ignore_for_file: use_build_context_synchronously
+
+import 'package:flutter/material.dart';
+import 'package:flutter_i18n/flutter_i18n.dart';
+import 'package:revanced_manager/app/app.locator.dart';
+import 'package:revanced_manager/services/manager_api.dart';
+import 'package:revanced_manager/ui/widgets/settingsView/custom_text_field.dart';
+import 'package:revanced_manager/ui/widgets/settingsView/settings_tile_dialog.dart';
+import 'package:revanced_manager/ui/widgets/shared/custom_material_button.dart';
+import 'package:stacked/stacked.dart';
+
+class SManageKeystorePassword extends BaseViewModel {
+  final ManagerAPI _managerAPI = locator<ManagerAPI>();
+
+  final TextEditingController _keystorePasswordController = TextEditingController();
+
+  Future<void> showKeystoreDialog(BuildContext context) async {
+    final String keystorePasswordText = _managerAPI.getKeystorePassword();
+    _keystorePasswordController.text = keystorePasswordText;
+    return showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Row(
+          children: <Widget>[
+            I18nText('settingsView.selectKeystorePassword'),
+            const Spacer(),
+            IconButton(
+              icon: const Icon(Icons.manage_history_outlined),
+              onPressed: () =>_keystorePasswordController.text = _managerAPI.defaultKeystorePassword,
+              color: Theme.of(context).colorScheme.secondary,
+            )
+          ],
+        ),
+        backgroundColor: Theme.of(context).colorScheme.secondaryContainer,
+        content: SingleChildScrollView(
+          child: Column(
+            children: <Widget>[
+              CustomTextField(
+                inputController: _keystorePasswordController,
+                label: I18nText('settingsView.selectKeystorePassword'),
+                hint: "",
+                onChanged: (value) => notifyListeners(),
+              ),
+            ],
+          ),
+        ),
+        actions: <Widget>[
+          CustomMaterialButton(
+            isFilled: false,
+            label: I18nText('cancelButton'),
+            onPressed: () {
+              _keystorePasswordController.clear();
+              Navigator.of(context).pop();
+            },
+          ),
+          CustomMaterialButton(
+            label: I18nText('okButton'),
+            onPressed: () {
+              String passwd = _keystorePasswordController.text;
+              _managerAPI.setKeystorePassword(passwd);
+              Navigator.of(context).pop();
+            },
+          )
+        ],
+      ),
+    );
+  }
+}
+
+final sManageKeystorePassword = SManageKeystorePassword();
+
+class SManageKeystorePasswordUI extends StatelessWidget {
+  const SManageKeystorePasswordUI({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return SettingsTileDialog(
+      padding: const EdgeInsets.symmetric(horizontal: 20.0),
+      title: 'settingsView.selectKeystorePassword',
+      subtitle: 'settingsView.selectKeystorePasswordHint',
+      onTap: () => sManageKeystorePassword.showKeystoreDialog(context),
+    );
+  }
+}

lib/ui/views/settings/settings_viewmodel.dart

@@ -104,6 +104,46 @@ class SettingsViewModel extends BaseViewModel {
     }
   }
 
+    Future<void> exportKeystore() async {
+    try {
+      final File outFile = File(_managerAPI.keystoreFile);
+      if (outFile.existsSync()) {
+        final String dateTime =
+            DateTime.now().toString().replaceAll(' ', '_').split('.').first;
+        await CRFileSaver.saveFileWithDialog(
+          SaveFileDialogParams(
+            sourceFilePath: outFile.path,
+            destinationFileName: 'keystore_$dateTime.keystore',
+          ),
+        );
+        _toast.showBottom('settingsView.exportedKeystore');
+      } else {
+        _toast.showBottom('settingsView.noKeystoreExportFileFound');
+      }
+    } on Exception catch (e) {
+      if (kDebugMode) {
+        print(e);
+      }
+    }
+  }
+
+  Future<void> importKeystore() async {
+    try {
+      final FilePickerResult? result = await FilePicker.platform.pickFiles();
+      if (result != null && result.files.single.path != null) {
+        final File inFile = File(result.files.single.path!);
+        inFile.copySync(_managerAPI.keystoreFile);
+        
+        _toast.showBottom('settingsView.importedKeystore');
+      }
+    } on Exception catch (e) {
+      if (kDebugMode) {
+        print(e);
+      }
+      _toast.showBottom('settingsView.keystoreSelectorErrorMessage');
+    }
+  }
+
   void resetSelectedPatches() {
     _managerAPI.resetLastSelectedPatches();
     _toast.showBottom('settingsView.resetStoredPatches');