main interfaces

.gitignore

@@ -0,0 +1,29 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
+/pubspec.lock
+**/doc/api/
+.dart_tool/
+build/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "aurora/sstore"]
+	path = aurora/sstore
+	url = git@git.markow.su:aurora/sstore.git

.metadata

@@ -0,0 +1,33 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "d3e00ac70443dbc0df7d0b56bff94c18d760b02f"
+  channel: "master"
+
+project_type: plugin
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: d3e00ac70443dbc0df7d0b56bff94c18d760b02f
+      base_revision: d3e00ac70443dbc0df7d0b56bff94c18d760b02f
+    - platform: linux
+      create_revision: d3e00ac70443dbc0df7d0b56bff94c18d760b02f
+      base_revision: d3e00ac70443dbc0df7d0b56bff94c18d760b02f
+    - platform: aurora
+      create_revision: d3e00ac70443dbc0df7d0b56bff94c18d760b02f
+      base_revision: d3e00ac70443dbc0df7d0b56bff94c18d760b02f
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

CHANGELOG.md

@@ -0,0 +1,3 @@
+## 0.0.1
+
+* TODO: Describe initial release.

LICENSE

@@ -0,0 +1 @@
+TODO: Add your license here.

analysis_options.yaml

@@ -0,0 +1,4 @@
+include: package:flutter_lints/flutter.yaml
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

aurora/CMakeLists.txt

@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.10)
+
+set(PROJECT_NAME secure_storage)
+set(PLUGIN_NAME  secure_storage_platform_plugin)
+
+project(${PROJECT_NAME} LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-psabi")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3")
+
+set(CMAKE_AUTOMOC ON)
+
+find_package(PkgConfig REQUIRED)
+find_package(Qt5 COMPONENTS Core DBus REQUIRED)
+pkg_check_modules(FlutterEmbedder REQUIRED IMPORTED_TARGET flutter-embedder)
+
+add_subdirectory(sstore)
+add_library(${PLUGIN_NAME} SHARED 
+    secure_storage_plugin.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/sstore/include/datastorage.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/sstore/datastorage.cpp)
+
+set_target_properties(${PLUGIN_NAME} PROPERTIES CXX_VISIBILITY_PRESET hidden)
+target_link_libraries(${PLUGIN_NAME} PRIVATE PkgConfig::FlutterEmbedder)
+target_link_libraries(${PLUGIN_NAME} PUBLIC Qt5::Core Qt5::DBus)
+
+target_include_directories(${PLUGIN_NAME} 
+    PUBLIC 
+    ${CMAKE_CURRENT_SOURCE_DIR}/include
+    ${SStoreInclude})
+target_compile_definitions(${PLUGIN_NAME} PRIVATE PLUGIN_IMPL)

aurora/include/secure_storage/globals.h

@@ -0,0 +1,10 @@
+#ifndef FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_GLOBALS_H
+#define FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_GLOBALS_H
+
+#ifdef PLUGIN_IMPL
+#define PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define PLUGIN_EXPORT
+#endif
+
+#endif /* FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_GLOBALS_H */

aurora/include/secure_storage/secure_storage_plugin.h

@@ -0,0 +1,19 @@
+#ifndef FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_H
+#define FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_H
+
+#include <flutter/plugin-interface.h>
+#include <secure_storage/globals.h>
+#include <datastorage.h>
+
+class PLUGIN_EXPORT SecureStoragePlugin final : public PluginInterface
+{
+public:
+    void RegisterWithRegistrar(PluginRegistrar &registrar) override;
+
+private:
+    DataStorage storage{};
+    void onMethodCall(const MethodCall &call);
+    void unimplemented(const MethodCall &call);
+};
+
+#endif /* FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_H */

aurora/secure_storage_plugin.cpp

@@ -0,0 +1,26 @@
+#include <secure_storage/secure_storage_plugin.h>
+#include <flutter/method-channel.h>
+
+void SecureStoragePlugin::RegisterWithRegistrar(PluginRegistrar &registrar)
+{
+    registrar.RegisterMethodChannel("secure_storage",
+                                    MethodCodecType::Standard,
+                                    [this](const MethodCall &call) { this->onMethodCall(call); });
+}
+
+void SecureStoragePlugin::onMethodCall(const MethodCall &call)
+{
+    const auto &method = call.GetMethod();
+
+    if (method == "available") {
+        call.SendSuccessResponse(storage.available());
+        return;
+    }
+
+    unimplemented(call);
+}
+
+void SecureStoragePlugin::unimplemented(const MethodCall &call)
+{
+    call.SendSuccessResponse(nullptr);
+}

aurora/sstore

@@ -0,0 +1 @@
+Subproject commit 321766b792a3e930cb2c175082be0bff5cab5ba1

example/.gitignore

@@ -0,0 +1,46 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release
+
+# Aurora generated
+/aurora/flutter

example/README.md

@@ -0,0 +1,16 @@
+# secure_storage_example
+
+Demonstrates how to use the secure_storage plugin.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+
+For help getting started with Flutter development, view the
+[online documentation](https://docs.flutter.dev/), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

example/analysis_options.yaml

@@ -0,0 +1,28 @@
+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at https://dart.dev/lints.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

example/aurora/.gitignore

@@ -0,0 +1 @@
+flutter/ephemeral

example/aurora/CMakeLists.txt

@@ -0,0 +1,47 @@
+cmake_minimum_required(VERSION 3.10)
+project(com.example.secure_storage_example LANGUAGES CXX)
+
+include(GNUInstallDirs)
+
+set(BINARY_NAME ${CMAKE_PROJECT_NAME})
+set(FLUTTER_DIR ${CMAKE_CURRENT_SOURCE_DIR}/flutter)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+set(CMAKE_CXX_FLAGS "-Wall -Wextra")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3")
+
+set(CMAKE_SKIP_RPATH OFF)
+set(CMAKE_INSTALL_RPATH "\$ORIGIN/../share/${BINARY_NAME}/lib")
+
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(FlutterEmbedder REQUIRED IMPORTED_TARGET flutter-embedder)
+
+add_executable(${BINARY_NAME} main.cpp ${FLUTTER_DIR}/generated_plugin_registrant.cpp)
+target_link_libraries(${BINARY_NAME} PRIVATE PkgConfig::FlutterEmbedder)
+target_include_directories(${BINARY_NAME} PRIVATE ${FLUTTER_DIR})
+
+include(flutter/generated_plugins.cmake)
+
+set(PACKAGE_INSTALL_DIR    ${CMAKE_INSTALL_DATADIR}/${BINARY_NAME})
+set(DESKTOP_INSTALL_DIR    ${CMAKE_INSTALL_DATADIR}/applications)
+set(ICONS_INSTALL_ROOT_DIR ${CMAKE_INSTALL_DATADIR}/icons/hicolor)
+
+add_custom_command(TARGET ${BINARY_NAME} POST_BUILD
+                   COMMAND ${CMAKE_COMMAND} -E copy
+                   ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}/libflutter-embedder.so
+                   ${PROJECT_BINARY_DIR}/bundle/lib/libflutter-embedder.so)
+
+install(FILES     ${PROJECT_BINARY_DIR}/bundle/icudtl.dat     DESTINATION ${PACKAGE_INSTALL_DIR})
+install(DIRECTORY ${PROJECT_BINARY_DIR}/bundle/flutter_assets DESTINATION ${PACKAGE_INSTALL_DIR})
+install(DIRECTORY ${PROJECT_BINARY_DIR}/bundle/lib            DESTINATION ${PACKAGE_INSTALL_DIR})
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+install(FILES desktop/${BINARY_NAME}.desktop DESTINATION ${DESKTOP_INSTALL_DIR})
+
+foreach(ICONS_SIZE 86x86 108x108 128x128 172x172)
+    install(FILES icons/${ICONS_SIZE}.png
+            RENAME ${BINARY_NAME}.png
+            DESTINATION ${ICONS_INSTALL_ROOT_DIR}/${ICONS_SIZE}/apps/)
+endforeach(ICONS_SIZE)

example/aurora/desktop/com.example.secure_storage_example.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Type=Application
+Name=secure_storage_example
+Comment=Demonstrates how to use the secure_storage plugin.
+Icon=com.example.secure_storage_example
+Exec=/usr/bin/com.example.secure_storage_example
+X-Nemo-Application-Type=silica-qt5
+
+[X-Application]
+Permissions=
+OrganizationName=com.example
+ApplicationName=secure_storage_example

example/aurora/main.cpp

@@ -0,0 +1,9 @@
+#include <flutter/application.h>
+#include "generated_plugin_registrant.h"
+
+int main(int argc, char *argv[]) {
+    Application::Initialize(argc, argv);
+    RegisterPlugins();
+    Application::Launch();
+    return 0;
+}

example/aurora/rpm/com.example.secure_storage_example.spec

@@ -0,0 +1,32 @@
+%global __provides_exclude_from ^%{_datadir}/%{name}/lib/.*$
+%global __requires_exclude ^lib(dconf|flutter-embedder|maliit-glib|.+_platform_plugin)\\.so.*$
+
+Name: com.example.secure_storage_example
+Summary: Demonstrates how to use the secure_storage plugin.
+Version: 0.1.0
+Release: 1
+License: Proprietary
+Source0: %{name}-%{version}.tar.zst
+
+BuildRequires: cmake
+BuildRequires: ninja
+BuildRequires: pkgconfig(flutter-embedder)
+
+%description
+%{summary}.
+
+%prep
+%autosetup
+
+%build
+%cmake -GNinja -DCMAKE_BUILD_TYPE=%{_flutter_build_type}
+%ninja_build
+
+%install
+%ninja_install
+
+%files
+%{_bindir}/%{name}
+%{_datadir}/%{name}/*
+%{_datadir}/applications/%{name}.desktop
+%{_datadir}/icons/hicolor/*/apps/%{name}.png

example/integration_test/plugin_integration_test.dart

@@ -0,0 +1,25 @@
+// This is a basic Flutter integration test.
+//
+// Since integration tests run in a full Flutter application, they can interact
+// with the host side of a plugin implementation, unlike Dart unit tests.
+//
+// For more information about Flutter integration tests, please see
+// https://docs.flutter.dev/cookbook/testing/integration/introduction
+
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:integration_test/integration_test.dart';
+
+import 'package:secure_storage/secure_storage.dart';
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  testWidgets('getPlatformVersion test', (WidgetTester tester) async {
+    final SecureStorage plugin = SecureStorage();
+    final String? version = await plugin.getPlatformVersion();
+    // The version string depends on the host platform running the test, so
+    // just assert that some non-empty string is returned.
+    expect(version?.isNotEmpty, true);
+  });
+}

example/lib/main.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/material.dart';
+import 'dart:async';
+
+import 'package:flutter/services.dart';
+import 'package:secure_storage/secure_storage.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatefulWidget {
+  const MyApp({super.key});
+
+  @override
+  State<MyApp> createState() => _MyAppState();
+}
+
+class _MyAppState extends State<MyApp> {
+  String _platformVersion = 'Unknown';
+  final _secureStoragePlugin = SecureStorage();
+
+  @override
+  void initState() {
+    super.initState();
+    initPlatformState();
+  }
+
+  // Platform messages are asynchronous, so we initialize in an async method.
+  Future<void> initPlatformState() async {
+    String platformVersion;
+    // Platform messages may fail, so we use a try/catch PlatformException.
+    // We also handle the message potentially returning null.
+    try {
+      platformVersion =
+          await _secureStoragePlugin.getPlatformVersion() ?? 'Unknown platform version';
+    } on PlatformException {
+      platformVersion = 'Failed to get platform version.';
+    }
+
+    // If the widget was removed from the tree while the asynchronous platform
+    // message was in flight, we want to discard the reply rather than calling
+    // setState to update our non-existent appearance.
+    if (!mounted) return;
+
+    setState(() {
+      _platformVersion = platformVersion;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(
+          title: const Text('Plugin example app'),
+        ),
+        body: Center(
+          child: Text('Running on: $_platformVersion\n'),
+        ),
+      ),
+    );
+  }
+}

example/linux/.gitignore

@@ -0,0 +1 @@
+flutter/ephemeral

example/linux/CMakeLists.txt

@@ -0,0 +1,147 @@
+# Project-level configuration.
+cmake_minimum_required(VERSION 3.10)
+project(runner LANGUAGES CXX)
+
+# The name of the executable created for the application. Change this to change
+# the on-disk name of your application.
+set(BINARY_NAME "secure_storage_example")
+# The unique GTK application identifier for this application. See:
+# https://wiki.gnome.org/HowDoI/ChooseApplicationID
+set(APPLICATION_ID "com.example.secure_storage")
+
+# Explicitly opt in to modern CMake behaviors to avoid warnings with recent
+# versions of CMake.
+cmake_policy(SET CMP0063 NEW)
+
+# Load bundled libraries from the lib/ directory relative to the binary.
+set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
+
+# Root filesystem for cross-building.
+if(FLUTTER_TARGET_PLATFORM_SYSROOT)
+  set(CMAKE_SYSROOT ${FLUTTER_TARGET_PLATFORM_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+
+# Define build configuration options.
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  set(CMAKE_BUILD_TYPE "Debug" CACHE
+    STRING "Flutter build mode" FORCE)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+    "Debug" "Profile" "Release")
+endif()
+
+# Compilation settings that should be applied to most targets.
+#
+# Be cautious about adding new options here, as plugins use this function by
+# default. In most cases, you should add new options to specific targets instead
+# of modifying this function.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_14)
+  target_compile_options(${TARGET} PRIVATE -Wall -Werror)
+  target_compile_options(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:-O3>")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:NDEBUG>")
+endfunction()
+
+# Flutter library and tool build rules.
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+
+add_definitions(-DAPPLICATION_ID="${APPLICATION_ID}")
+
+# Define the application target. To change its name, change BINARY_NAME above,
+# not the value here, or `flutter run` will no longer work.
+#
+# Any new source files that you add to the application should be added here.
+add_executable(${BINARY_NAME}
+  "main.cc"
+  "my_application.cc"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+)
+
+# Apply the standard set of build settings. This can be removed for applications
+# that need different build settings.
+apply_standard_settings(${BINARY_NAME})
+
+# Add dependency libraries. Add any application-specific dependencies here.
+target_link_libraries(${BINARY_NAME} PRIVATE flutter)
+target_link_libraries(${BINARY_NAME} PRIVATE PkgConfig::GTK)
+
+# Run the Flutter tool portions of the build. This must not be removed.
+add_dependencies(${BINARY_NAME} flutter_assemble)
+
+# Only the install-generated bundle's copy of the executable will launch
+# correctly, since the resources must in the right relative locations. To avoid
+# people trying to run the unbundled copy, put it in a subdirectory instead of
+# the default top-level location.
+set_target_properties(${BINARY_NAME}
+  PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/intermediates_do_not_run"
+)
+
+# Enable the test target.
+set(include_secure_storage_tests TRUE)
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# By default, "installing" just makes a relocatable bundle in the build
+# directory.
+set(BUILD_BUNDLE_DIR "${PROJECT_BINARY_DIR}/bundle")
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+# Start with a clean build bundle directory every time.
+install(CODE "
+  file(REMOVE_RECURSE \"${BUILD_BUNDLE_DIR}/\")
+  " COMPONENT Runtime)
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+foreach(bundled_library ${PLUGIN_BUNDLED_LIBRARIES})
+  install(FILES "${bundled_library}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endforeach(bundled_library)
+
+# Copy the native assets provided by the build.dart from all packages.
+set(NATIVE_ASSETS_DIR "${PROJECT_BUILD_DIR}native_assets/linux/")
+install(DIRECTORY "${NATIVE_ASSETS_DIR}"
+   DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+   COMPONENT Runtime)
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
+  install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()

example/linux/flutter/CMakeLists.txt

@@ -0,0 +1,88 @@
+# This file controls Flutter-level build steps. It should not be edited.
+cmake_minimum_required(VERSION 3.10)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+
+# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
+# which isn't available in 3.10.
+function(list_prepend LIST_NAME PREFIX)
+    set(NEW_LIST "")
+    foreach(element ${${LIST_NAME}})
+        list(APPEND NEW_LIST "${PREFIX}${element}")
+    endforeach(element)
+    set(${LIST_NAME} "${NEW_LIST}" PARENT_SCOPE)
+endfunction()
+
+# === Flutter Library ===
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
+pkg_check_modules(GIO REQUIRED IMPORTED_TARGET gio-2.0)
+
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/libflutter_linux_gtk.so")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/lib/libapp.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "fl_basic_message_channel.h"
+  "fl_binary_codec.h"
+  "fl_binary_messenger.h"
+  "fl_dart_project.h"
+  "fl_engine.h"
+  "fl_json_message_codec.h"
+  "fl_json_method_codec.h"
+  "fl_message_codec.h"
+  "fl_method_call.h"
+  "fl_method_channel.h"
+  "fl_method_codec.h"
+  "fl_method_response.h"
+  "fl_plugin_registrar.h"
+  "fl_plugin_registry.h"
+  "fl_standard_message_codec.h"
+  "fl_standard_method_codec.h"
+  "fl_string_codec.h"
+  "fl_value.h"
+  "fl_view.h"
+  "flutter_linux.h"
+)
+list_prepend(FLUTTER_LIBRARY_HEADERS "${EPHEMERAL_DIR}/flutter_linux/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}")
+target_link_libraries(flutter INTERFACE
+  PkgConfig::GTK
+  PkgConfig::GLIB
+  PkgConfig::GIO
+)
+add_dependencies(flutter flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CMAKE_CURRENT_BINARY_DIR}/_phony_
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.sh"
+      ${FLUTTER_TARGET_PLATFORM} ${CMAKE_BUILD_TYPE}
+  VERBATIM
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+)

example/linux/main.cc

@@ -0,0 +1,6 @@
+#include "my_application.h"
+
+int main(int argc, char** argv) {
+  g_autoptr(MyApplication) app = my_application_new();
+  return g_application_run(G_APPLICATION(app), argc, argv);
+}

example/linux/my_application.cc

@@ -0,0 +1,104 @@
+#include "my_application.h"
+
+#include <flutter_linux/flutter_linux.h>
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+
+#include "flutter/generated_plugin_registrant.h"
+
+struct _MyApplication {
+  GtkApplication parent_instance;
+  char** dart_entrypoint_arguments;
+};
+
+G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)
+
+// Implements GApplication::activate.
+static void my_application_activate(GApplication* application) {
+  MyApplication* self = MY_APPLICATION(application);
+  GtkWindow* window =
+      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
+
+  // Use a header bar when running in GNOME as this is the common style used
+  // by applications and is the setup most users will be using (e.g. Ubuntu
+  // desktop).
+  // If running on X and not using GNOME then just use a traditional title bar
+  // in case the window manager does more exotic layout, e.g. tiling.
+  // If running on Wayland assume the header bar will work (may need changing
+  // if future cases occur).
+  gboolean use_header_bar = TRUE;
+#ifdef GDK_WINDOWING_X11
+  GdkScreen* screen = gtk_window_get_screen(window);
+  if (GDK_IS_X11_SCREEN(screen)) {
+    const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen);
+    if (g_strcmp0(wm_name, "GNOME Shell") != 0) {
+      use_header_bar = FALSE;
+    }
+  }
+#endif
+  if (use_header_bar) {
+    GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
+    gtk_widget_show(GTK_WIDGET(header_bar));
+    gtk_header_bar_set_title(header_bar, "secure_storage_example");
+    gtk_header_bar_set_show_close_button(header_bar, TRUE);
+    gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
+  } else {
+    gtk_window_set_title(window, "secure_storage_example");
+  }
+
+  gtk_window_set_default_size(window, 1280, 720);
+  gtk_widget_show(GTK_WIDGET(window));
+
+  g_autoptr(FlDartProject) project = fl_dart_project_new();
+  fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);
+
+  FlView* view = fl_view_new(project);
+  gtk_widget_show(GTK_WIDGET(view));
+  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));
+
+  fl_register_plugins(FL_PLUGIN_REGISTRY(view));
+
+  gtk_widget_grab_focus(GTK_WIDGET(view));
+}
+
+// Implements GApplication::local_command_line.
+static gboolean my_application_local_command_line(GApplication* application, gchar*** arguments, int* exit_status) {
+  MyApplication* self = MY_APPLICATION(application);
+  // Strip out the first argument as it is the binary name.
+  self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);
+
+  g_autoptr(GError) error = nullptr;
+  if (!g_application_register(application, nullptr, &error)) {
+     g_warning("Failed to register: %s", error->message);
+     *exit_status = 1;
+     return TRUE;
+  }
+
+  g_application_activate(application);
+  *exit_status = 0;
+
+  return TRUE;
+}
+
+// Implements GObject::dispose.
+static void my_application_dispose(GObject* object) {
+  MyApplication* self = MY_APPLICATION(object);
+  g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
+  G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
+}
+
+static void my_application_class_init(MyApplicationClass* klass) {
+  G_APPLICATION_CLASS(klass)->activate = my_application_activate;
+  G_APPLICATION_CLASS(klass)->local_command_line = my_application_local_command_line;
+  G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
+}
+
+static void my_application_init(MyApplication* self) {}
+
+MyApplication* my_application_new() {
+  return MY_APPLICATION(g_object_new(my_application_get_type(),
+                                     "application-id", APPLICATION_ID,
+                                     "flags", G_APPLICATION_NON_UNIQUE,
+                                     nullptr));
+}

example/linux/my_application.h

@@ -0,0 +1,18 @@
+#ifndef FLUTTER_MY_APPLICATION_H_
+#define FLUTTER_MY_APPLICATION_H_
+
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE(MyApplication, my_application, MY, APPLICATION,
+                     GtkApplication)
+
+/**
+ * my_application_new:
+ *
+ * Creates a new Flutter-based application.
+ *
+ * Returns: a new #MyApplication.
+ */
+MyApplication* my_application_new();
+
+#endif  // FLUTTER_MY_APPLICATION_H_

example/pubspec.lock

@@ -0,0 +1,267 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.11.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: ee67cb0715911d28db6bf4af1026078bd6f0128b07a5f66fb2ed94ec6783c09a
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.18.0"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      sha256: d57953e10f9f8327ce64a508a355f0b1ec902193f66288e8cb5070e7c47eeb2d
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.6"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.1"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      sha256: "1b92bec4fc2a72f59a8e15af5f52cd441e4a7860b49499d69dfa817af20e925d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.4"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_driver:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: a25a15ebbdfc33ab1cd26c63a6ee519df92338a9c10f122adda92938253bef04
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.3"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  fuchsia_remote_debug_protocol:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  integration_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: "0a217c6c989d21039f1498c3ed9f3ed71b354e69873f13a8dfc3c9fe76f1b452"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.16"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.5.0"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.8.3"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      sha256: ae68c7bfcd7383af3629daafb32fb4e8681c7154428da4febcff06200585f102
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.2"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: f4f88d4a900933e7267e2b353594774fc0d07fb072b47eedcd5b54e1ea3269f8
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.7"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      sha256: "53fd8db9cec1d37b0574e12f07520d582019cb6c44abf5479a01505099a34a09"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.2.4"
+  secure_storage:
+    dependency: "direct main"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "0.0.1"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.11.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  sync_http:
+    dependency: transitive
+    description:
+      name: sync_http
+      sha256: "7f0cd72eca000d2e026bcd6f990b81d0ca06022ef4e32fb257b30d3d1014a961"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.1"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "5c2f730018264d276c20e4f1503fd1308dfbbae39ec8ee63c5236311ac06954b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.1"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: c538be99af830f478718b51630ec1b6bee5e74e52c8a802d328d9e71d35d2583
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.10.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.0"
+  webdriver:
+    dependency: transitive
+    description:
+      name: webdriver
+      sha256: "3c923e918918feeb90c4c9fdf1fe39220fa4c0e8e2c0fffaded174498ef86c49"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+sdks:
+  dart: ">=3.2.2 <4.0.0"
+  flutter: ">=3.3.0"

example/pubspec.yaml

@@ -0,0 +1,85 @@
+name: secure_storage_example
+description: "Demonstrates how to use the secure_storage plugin."
+# The following line prevents the package from being accidentally published to
+# pub.dev using `flutter pub publish`. This is preferred for private packages.
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+environment:
+  sdk: '>=3.2.2 <4.0.0'
+
+# Dependencies specify other packages that your package needs in order to work.
+# To automatically upgrade your package dependencies to the latest versions
+# consider running `flutter pub upgrade --major-versions`. Alternatively,
+# dependencies can be manually updated by changing the version numbers below to
+# the latest version available on pub.dev. To see which dependencies have newer
+# versions available, run `flutter pub outdated`.
+dependencies:
+  flutter:
+    sdk: flutter
+
+  secure_storage:
+    # When depending on this package from a real application you should use:
+    #   secure_storage: ^x.y.z
+    # See https://dart.dev/tools/pub/dependencies#version-constraints
+    # The example app is bundled with the plugin so we use a path dependency on
+    # the parent directory to use the current plugin's version.
+    path: ../
+
+  # The following adds the Cupertino Icons font to your application.
+  # Use with the CupertinoIcons class for iOS style icons.
+  cupertino_icons: ^1.0.2
+
+dev_dependencies:
+  integration_test:
+    sdk: flutter
+  flutter_test:
+    sdk: flutter
+
+  # The "flutter_lints" package below contains a set of recommended lints to
+  # encourage good coding practices. The lint set provided by the package is
+  # activated in the `analysis_options.yaml` file located at the root of your
+  # package. See that file for information about deactivating specific lint
+  # rules and activating additional ones.
+  flutter_lints: ^2.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages

example/test/widget_test.dart

@@ -0,0 +1,27 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility in the flutter_test package. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:secure_storage_example/main.dart';
+
+void main() {
+  testWidgets('Verify Platform version', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(const MyApp());
+
+    // Verify that platform version is retrieved.
+    expect(
+      find.byWidgetPredicate(
+        (Widget widget) => widget is Text &&
+                           widget.data!.startsWith('Running on:'),
+      ),
+      findsOneWidget,
+    );
+  });
+}

lib/secure_storage.dart

@@ -0,0 +1,8 @@
+
+import 'secure_storage_platform_interface.dart';
+
+class SecureStorage {
+  Future<String?> getPlatformVersion() {
+    return SecureStoragePlatform.instance.getPlatformVersion();
+  }
+}

lib/secure_storage_method_channel.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+import 'secure_storage_platform_interface.dart';
+
+/// An implementation of [SecureStoragePlatform] that uses method channels.
+class MethodChannelSecureStorage extends SecureStoragePlatform {
+  /// The method channel used to interact with the native platform.
+  @visibleForTesting
+  final methodChannel = const MethodChannel('secure_storage');
+
+  @override
+  Future<String?> getPlatformVersion() async {
+    final version = await methodChannel.invokeMethod<String>('getPlatformVersion');
+    return version;
+  }
+}

lib/secure_storage_platform_interface.dart

@@ -0,0 +1,29 @@
+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+import 'secure_storage_method_channel.dart';
+
+abstract class SecureStoragePlatform extends PlatformInterface {
+  /// Constructs a SecureStoragePlatform.
+  SecureStoragePlatform() : super(token: _token);
+
+  static final Object _token = Object();
+
+  static SecureStoragePlatform _instance = MethodChannelSecureStorage();
+
+  /// The default instance of [SecureStoragePlatform] to use.
+  ///
+  /// Defaults to [MethodChannelSecureStorage].
+  static SecureStoragePlatform get instance => _instance;
+
+  /// Platform-specific implementations should set this with their own
+  /// platform-specific class that extends [SecureStoragePlatform] when
+  /// they register themselves.
+  static set instance(SecureStoragePlatform instance) {
+    PlatformInterface.verifyToken(instance, _token);
+    _instance = instance;
+  }
+
+  Future<String?> getPlatformVersion() {
+    throw UnimplementedError('platformVersion() has not been implemented.');
+  }
+}

linux/CMakeLists.txt

@@ -0,0 +1,94 @@
+# The Flutter tooling requires that developers have CMake 3.10 or later
+# installed. You should not increase this version, as doing so will cause
+# the plugin to fail to compile for some customers of the plugin.
+cmake_minimum_required(VERSION 3.10)
+
+# Project-level configuration.
+set(PROJECT_NAME "secure_storage")
+project(${PROJECT_NAME} LANGUAGES CXX)
+
+# This value is used when generating builds using this plugin, so it must
+# not be changed.
+set(PLUGIN_NAME "secure_storage_plugin")
+
+# Any new source files that you add to the plugin should be added here.
+list(APPEND PLUGIN_SOURCES
+  "secure_storage_plugin.cc"
+)
+
+# Define the plugin library target. Its name must not be changed (see comment
+# on PLUGIN_NAME above).
+add_library(${PLUGIN_NAME} SHARED
+  ${PLUGIN_SOURCES}
+)
+
+# Apply a standard set of build settings that are configured in the
+# application-level CMakeLists.txt. This can be removed for plugins that want
+# full control over build settings.
+apply_standard_settings(${PLUGIN_NAME})
+
+# Symbols are hidden by default to reduce the chance of accidental conflicts
+# between plugins. This should not be removed; any symbols that should be
+# exported should be explicitly exported with the FLUTTER_PLUGIN_EXPORT macro.
+set_target_properties(${PLUGIN_NAME} PROPERTIES
+  CXX_VISIBILITY_PRESET hidden)
+target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
+
+# Source include directories and library dependencies. Add any plugin-specific
+# dependencies here.
+target_include_directories(${PLUGIN_NAME} INTERFACE
+  "${CMAKE_CURRENT_SOURCE_DIR}/include")
+target_link_libraries(${PLUGIN_NAME} PRIVATE flutter)
+target_link_libraries(${PLUGIN_NAME} PRIVATE PkgConfig::GTK)
+
+# List of absolute paths to libraries that should be bundled with the plugin.
+# This list could contain prebuilt libraries, or libraries created by an
+# external build triggered from this build file.
+set(secure_storage_bundled_libraries
+  ""
+  PARENT_SCOPE
+)
+
+# === Tests ===
+# These unit tests can be run from a terminal after building the example.
+
+# Only enable test builds when building the example (which sets this variable)
+# so that plugin clients aren't building the tests.
+if (${include_${PROJECT_NAME}_tests})
+if(${CMAKE_VERSION} VERSION_LESS "3.11.0")
+message("Unit tests require CMake 3.11.0 or later")
+else()
+set(TEST_RUNNER "${PROJECT_NAME}_test")
+enable_testing()
+
+# Add the Google Test dependency.
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/release-1.11.0.zip
+)
+# Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+# Disable install commands for gtest so it doesn't end up in the bundle.
+set(INSTALL_GTEST OFF CACHE BOOL "Disable installation of googletest" FORCE)
+
+FetchContent_MakeAvailable(googletest)
+
+# The plugin's exported API is not very useful for unit testing, so build the
+# sources directly into the test binary rather than using the shared library.
+add_executable(${TEST_RUNNER}
+  test/secure_storage_plugin_test.cc
+  ${PLUGIN_SOURCES}
+)
+apply_standard_settings(${TEST_RUNNER})
+target_include_directories(${TEST_RUNNER} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")
+target_link_libraries(${TEST_RUNNER} PRIVATE flutter)
+target_link_libraries(${TEST_RUNNER} PRIVATE PkgConfig::GTK)
+target_link_libraries(${TEST_RUNNER} PRIVATE gtest_main gmock)
+
+# Enable automatic test discovery.
+include(GoogleTest)
+gtest_discover_tests(${TEST_RUNNER})
+
+endif()  # CMake version check
+endif()  # include_${PROJECT_NAME}_tests

linux/include/secure_storage/secure_storage_plugin.h

@@ -0,0 +1,26 @@
+#ifndef FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_H_
+#define FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_H_
+
+#include <flutter_linux/flutter_linux.h>
+
+G_BEGIN_DECLS
+
+#ifdef FLUTTER_PLUGIN_IMPL
+#define FLUTTER_PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define FLUTTER_PLUGIN_EXPORT
+#endif
+
+typedef struct _SecureStoragePlugin SecureStoragePlugin;
+typedef struct {
+  GObjectClass parent_class;
+} SecureStoragePluginClass;
+
+FLUTTER_PLUGIN_EXPORT GType secure_storage_plugin_get_type();
+
+FLUTTER_PLUGIN_EXPORT void secure_storage_plugin_register_with_registrar(
+    FlPluginRegistrar* registrar);
+
+G_END_DECLS
+
+#endif  // FLUTTER_PLUGIN_SECURE_STORAGE_PLUGIN_H_

linux/secure_storage_plugin.cc

@@ -0,0 +1,76 @@
+#include "include/secure_storage/secure_storage_plugin.h"
+
+#include <flutter_linux/flutter_linux.h>
+#include <gtk/gtk.h>
+#include <sys/utsname.h>
+
+#include <cstring>
+
+#include "secure_storage_plugin_private.h"
+
+#define SECURE_STORAGE_PLUGIN(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj), secure_storage_plugin_get_type(), \
+                              SecureStoragePlugin))
+
+struct _SecureStoragePlugin {
+  GObject parent_instance;
+};
+
+G_DEFINE_TYPE(SecureStoragePlugin, secure_storage_plugin, g_object_get_type())
+
+// Called when a method call is received from Flutter.
+static void secure_storage_plugin_handle_method_call(
+    SecureStoragePlugin* self,
+    FlMethodCall* method_call) {
+  g_autoptr(FlMethodResponse) response = nullptr;
+
+  const gchar* method = fl_method_call_get_name(method_call);
+
+  if (strcmp(method, "getPlatformVersion") == 0) {
+    response = get_platform_version();
+  } else {
+    response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());
+  }
+
+  fl_method_call_respond(method_call, response, nullptr);
+}
+
+FlMethodResponse* get_platform_version() {
+  struct utsname uname_data = {};
+  uname(&uname_data);
+  g_autofree gchar *version = g_strdup_printf("Linux %s", uname_data.version);
+  g_autoptr(FlValue) result = fl_value_new_string(version);
+  return FL_METHOD_RESPONSE(fl_method_success_response_new(result));
+}
+
+static void secure_storage_plugin_dispose(GObject* object) {
+  G_OBJECT_CLASS(secure_storage_plugin_parent_class)->dispose(object);
+}
+
+static void secure_storage_plugin_class_init(SecureStoragePluginClass* klass) {
+  G_OBJECT_CLASS(klass)->dispose = secure_storage_plugin_dispose;
+}
+
+static void secure_storage_plugin_init(SecureStoragePlugin* self) {}
+
+static void method_call_cb(FlMethodChannel* channel, FlMethodCall* method_call,
+                           gpointer user_data) {
+  SecureStoragePlugin* plugin = SECURE_STORAGE_PLUGIN(user_data);
+  secure_storage_plugin_handle_method_call(plugin, method_call);
+}
+
+void secure_storage_plugin_register_with_registrar(FlPluginRegistrar* registrar) {
+  SecureStoragePlugin* plugin = SECURE_STORAGE_PLUGIN(
+      g_object_new(secure_storage_plugin_get_type(), nullptr));
+
+  g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new();
+  g_autoptr(FlMethodChannel) channel =
+      fl_method_channel_new(fl_plugin_registrar_get_messenger(registrar),
+                            "secure_storage",
+                            FL_METHOD_CODEC(codec));
+  fl_method_channel_set_method_call_handler(channel, method_call_cb,
+                                            g_object_ref(plugin),
+                                            g_object_unref);
+
+  g_object_unref(plugin);
+}

linux/secure_storage_plugin_private.h

@@ -0,0 +1,10 @@
+#include <flutter_linux/flutter_linux.h>
+
+#include "include/secure_storage/secure_storage_plugin.h"
+
+// This file exposes some plugin internals for unit testing. See
+// https://github.com/flutter/flutter/issues/88724 for current limitations
+// in the unit-testable API.
+
+// Handles the getPlatformVersion method call.
+FlMethodResponse *get_platform_version();

linux/test/secure_storage_plugin_test.cc

@@ -0,0 +1,31 @@
+#include <flutter_linux/flutter_linux.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "include/secure_storage/secure_storage_plugin.h"
+#include "secure_storage_plugin_private.h"
+
+// This demonstrates a simple unit test of the C portion of this plugin's
+// implementation.
+//
+// Once you have built the plugin's example app, you can run these tests
+// from the command line. For instance, for a plugin called my_plugin
+// built for x64 debug, run:
+// $ build/linux/x64/debug/plugins/my_plugin/my_plugin_test
+
+namespace secure_storage {
+namespace test {
+
+TEST(SecureStoragePlugin, GetPlatformVersion) {
+  g_autoptr(FlMethodResponse) response = get_platform_version();
+  ASSERT_NE(response, nullptr);
+  ASSERT_TRUE(FL_IS_METHOD_SUCCESS_RESPONSE(response));
+  FlValue* result = fl_method_success_response_get_result(
+      FL_METHOD_SUCCESS_RESPONSE(response));
+  ASSERT_EQ(fl_value_get_type(result), FL_VALUE_TYPE_STRING);
+  // The full string varies, so just validate that it has the right format.
+  EXPECT_THAT(fl_value_get_string(result), testing::StartsWith("Linux "));
+}
+
+}  // namespace test
+}  // namespace secure_storage

pubspec.yaml

@@ -0,0 +1,71 @@
+name: secure_storage
+description: "A new Flutter plugin project."
+version: 0.0.1
+homepage:
+
+environment:
+  sdk: '>=3.1.2 <4.0.0'
+  flutter: '>=3.3.0'
+
+dependencies:
+  flutter:
+    sdk: flutter
+  plugin_platform_interface: ^2.0.2
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^2.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+  # This section identifies this Flutter project as a plugin project.
+  # The 'pluginClass' specifies the class (in Java, Kotlin, Swift, Objective-C, etc.)
+  # which should be registered in the plugin registry. This is required for
+  # using method channels.
+  # The Android 'package' specifies package in which the registered class is.
+  # This is required for using method channels on Android.
+  # The 'ffiPlugin' specifies that native code should be built and bundled.
+  # This is required for using `dart:ffi`.
+  # All these are used by the tooling to maintain consistency when
+  # adding or updating assets for this project.
+  plugin:
+    platforms:
+      linux:
+        pluginClass: SecureStoragePlugin
+      aurora:
+        pluginClass: SecureStoragePlugin
+
+  # To add assets to your plugin package, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+  #
+  # For details regarding assets in packages, see
+  # https://flutter.dev/assets-and-images/#from-packages
+  #
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware
+
+  # To add custom fonts to your plugin package, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts in packages, see
+  # https://flutter.dev/custom-fonts/#from-packages

test/secure_storage_method_channel_test.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:secure_storage/secure_storage_method_channel.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  MethodChannelSecureStorage platform = MethodChannelSecureStorage();
+  const MethodChannel channel = MethodChannel('secure_storage');
+
+  setUp(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
+      channel,
+      (MethodCall methodCall) async {
+        return '42';
+      },
+    );
+  });
+
+  tearDown(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(channel, null);
+  });
+
+  test('getPlatformVersion', () async {
+    expect(await platform.getPlatformVersion(), '42');
+  });
+}

test/secure_storage_test.dart

@@ -0,0 +1,29 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:secure_storage/secure_storage.dart';
+import 'package:secure_storage/secure_storage_platform_interface.dart';
+import 'package:secure_storage/secure_storage_method_channel.dart';
+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+class MockSecureStoragePlatform
+    with MockPlatformInterfaceMixin
+    implements SecureStoragePlatform {
+
+  @override
+  Future<String?> getPlatformVersion() => Future.value('42');
+}
+
+void main() {
+  final SecureStoragePlatform initialPlatform = SecureStoragePlatform.instance;
+
+  test('$MethodChannelSecureStorage is the default instance', () {
+    expect(initialPlatform, isInstanceOf<MethodChannelSecureStorage>());
+  });
+
+  test('getPlatformVersion', () async {
+    SecureStorage secureStoragePlugin = SecureStorage();
+    MockSecureStoragePlatform fakePlatform = MockSecureStoragePlatform();
+    SecureStoragePlatform.instance = fakePlatform;
+
+    expect(await secureStoragePlugin.getPlatformVersion(), '42');
+  });
+}