Add update checking

lib/domain/app/app.dart

@@ -0,0 +1,3 @@
+export 'update_failure.dart';
+export 'update_repository.dart';
+export 'version_info.dart';

lib/domain/app/update_failure.dart

@@ -0,0 +1,22 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:hiddify/core/locale/locale.dart';
+import 'package:hiddify/domain/failures.dart';
+
+part 'update_failure.freezed.dart';
+
+@freezed
+sealed class UpdateFailure with _$UpdateFailure, Failure {
+  const UpdateFailure._();
+
+  const factory UpdateFailure.unexpected([
+    Object? error,
+    StackTrace? stackTrace,
+  ]) = UpdateUnexpectedFailure;
+
+  @override
+  String present(TranslationsEn t) {
+    return switch (this) {
+      UpdateUnexpectedFailure() => t.failure.unexpected,
+    };
+  }
+}

lib/domain/app/update_repository.dart

@@ -0,0 +1,11 @@
+import 'package:fpdart/fpdart.dart';
+import 'package:hiddify/domain/app/update_failure.dart';
+import 'package:hiddify/domain/app/version_info.dart';
+
+abstract interface class UpdateRepository {
+  TaskEither<UpdateFailure, InstalledVersionInfo> getCurrentVersion();
+
+  TaskEither<UpdateFailure, RemoteVersionInfo> getLatestVersion({
+    bool includePreReleases = false,
+  });
+}

lib/domain/app/version_info.dart

@@ -0,0 +1,56 @@
+import 'package:dartx/dartx.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'version_info.freezed.dart';
+part 'version_info.g.dart';
+
+@freezed
+class InstalledVersionInfo with _$InstalledVersionInfo {
+  const InstalledVersionInfo._();
+
+  const factory InstalledVersionInfo({
+    required String version,
+    required String buildNumber,
+    String? installerMedia,
+  }) = _InstalledVersionInfo;
+
+  String get fullVersion =>
+      buildNumber.isBlank ? version : "$version+$buildNumber";
+
+  factory InstalledVersionInfo.fromJson(Map<String, dynamic> json) =>
+      _$InstalledVersionInfoFromJson(json);
+}
+
+// TODO ignore drafts
+@Freezed()
+class RemoteVersionInfo with _$RemoteVersionInfo {
+  const RemoteVersionInfo._();
+
+  const factory RemoteVersionInfo({
+    required String version,
+    required String buildNumber,
+    required String releaseTag,
+    required bool preRelease,
+    required DateTime publishedAt,
+  }) = _RemoteVersionInfo;
+
+  String get fullVersion =>
+      buildNumber.isBlank ? version : "$version+$buildNumber";
+
+  // ignore: prefer_constructors_over_static_methods
+  static RemoteVersionInfo fromJson(Map<String, dynamic> json) {
+    final fullTag = json['tag_name'] as String;
+    final fullVersion = fullTag.removePrefix("v").split("-").first.split("+");
+    final version = fullVersion.first;
+    final buildNumber = fullVersion.elementAtOrElse(1, (index) => "");
+    final preRelease = json["prerelease"] as bool;
+    final publishedAt = DateTime.parse(json["published_at"] as String);
+    return RemoteVersionInfo(
+      version: version,
+      buildNumber: buildNumber,
+      releaseTag: fullTag,
+      preRelease: preRelease,
+      publishedAt: publishedAt,
+    );
+  }
+}

lib/domain/constants.dart

@@ -5,5 +5,9 @@ abstract class Constants {
   static const configFileName = "config";
   static const countryMMDBFileName = "Country";
   static const githubUrl = "https://github.com/hiddify/hiddify-next";
+  static const githubReleasesApiUrl =
+      "https://api.github.com/repos/hiddify/hiddify-next/releases";
+  static const githubLatestReleaseUrl =
+      "https://github.com/hiddify/hiddify-next/releases/latest";
   static const telegramChannelUrl = "https://t.me/hiddify";
 }