feat(shorebird_cli): add release android_archive command

packages/shorebird_cli/lib/src/command.dart

@@ -15,6 +15,9 @@ import 'package:shorebird_code_push_client/shorebird_code_push_client.dart';
 /// Signature for a function which takes a list of bytes and returns a hash.
 typedef HashFunction = String Function(List<int> bytes);
 
+/// Signature for a function which takes a path to a zip file.
+typedef UnzipFn = Future<void> Function(String zipFilePath, String outputDir);
+
 typedef CodePushClientBuilder = CodePushClient Function({
   required http.Client httpClient,
   Uri? hostedUri,

packages/shorebird_cli/lib/src/commands/build/build.dart

@@ -1,3 +1,4 @@
+export 'build_aar_command.dart';
 export 'build_apk_command.dart';
 export 'build_app_bundle_command.dart';
 export 'build_command.dart';

packages/shorebird_cli/lib/src/commands/build/build_aar_command.dart

@@ -0,0 +1,99 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:mason_logger/mason_logger.dart';
+import 'package:path/path.dart' as p;
+import 'package:shorebird_cli/src/auth_logger_mixin.dart';
+import 'package:shorebird_cli/src/command.dart';
+import 'package:shorebird_cli/src/shorebird_build_mixin.dart';
+import 'package:shorebird_cli/src/shorebird_config_mixin.dart';
+import 'package:shorebird_cli/src/shorebird_validation_mixin.dart';
+
+/// {@template build_aar_command}
+///
+/// `shorebird build aar`
+/// Build an Android aar file from your app.
+/// {@endtemplate}
+class BuildAarCommand extends ShorebirdCommand
+    with
+        AuthLoggerMixin,
+        ShorebirdValidationMixin,
+        ShorebirdConfigMixin,
+        ShorebirdBuildMixin {
+  BuildAarCommand({
+    required super.logger,
+    super.auth,
+  }) {
+    // We would have a "target" option here, similar to what [BuildApkCommand]
+    // and [BuildAabCommand] have, but target cannot currently be configured in
+    // `flutter build aar` and is always assumed to be lib/main.dart.
+    argParser
+      ..addOption(
+        'flavor',
+        help: 'The product flavor to use when building the app.',
+      )
+      // `flutter build aar` defaults to a build number of 1.0, so we do the
+      // same.
+      ..addOption(
+        'build-number',
+        help: 'The build number of the aar',
+        defaultsTo: '1.0',
+      );
+  }
+
+  @override
+  String get name => 'aar';
+
+  @override
+  String get description => 'Build an Android AAR file from your module.';
+
+  @override
+  Future<int> run() async {
+    if (!auth.isAuthenticated) {
+      printNeedsAuthInstructions();
+      return ExitCode.noUser.code;
+    }
+
+    final pubspec = getPubspecYaml();
+    if (pubspec == null) {
+      logger.err('No pubspec.yaml file found.');
+      return ExitCode.config.code;
+    }
+
+    final module = pubspec.flutter?['module'] as Map?;
+    final androidPackageName = module?['androidPackage'] as String?;
+    if (androidPackageName == null) {
+      logger.err('Could not find androidPackage in pubspec.yaml.');
+      return ExitCode.config.code;
+    }
+
+    final flavor = results['flavor'] as String?;
+    final buildNumber = results['build-number'] as String;
+    final buildProgress = logger.progress('Building aar');
+    try {
+      await buildAar(buildNumber: buildNumber, flavor: flavor);
+    } on ProcessException catch (error) {
+      buildProgress.fail('Failed to build: ${error.message}');
+      return ExitCode.software.code;
+    }
+
+    buildProgress.complete();
+
+    final aarPath = p.joinAll([
+      'build',
+      'host',
+      'outputs',
+      'repo',
+      ...androidPackageName.split('.'),
+      'flutter_release',
+      buildNumber,
+      'flutter_release-$buildNumber.aar',
+    ]);
+
+    logger.info('''
+📦 Generated an aar at:
+${lightCyan.wrap(aarPath)}''');
+
+    return ExitCode.success.code;
+  }
+}

packages/shorebird_cli/lib/src/commands/build/build_command.dart

@@ -8,6 +8,7 @@ import 'package:shorebird_cli/src/commands/build/build.dart';
 class BuildCommand extends ShorebirdCommand {
   /// {@macro build_command}
   BuildCommand({required super.logger}) {
+    addSubcommand(BuildAarCommand(logger: logger));
     addSubcommand(BuildApkCommand(logger: logger));
     addSubcommand(BuildAppBundleCommand(logger: logger));
     addSubcommand(BuildIpaCommand(logger: logger));

packages/shorebird_cli/lib/src/commands/release/release.dart

@@ -1,3 +1,4 @@
+export 'release_android_archive_command.dart';
 export 'release_android_command.dart';
 export 'release_command.dart';
 export 'release_ios_command.dart';