feat(code_push_protocol): add subscription object to user

packages/shorebird_code_push_protocol/lib/src/models/models.dart

@@ -6,4 +6,5 @@ export 'patch.dart';
 export 'patch_artifact.dart';
 export 'release.dart';
 export 'release_artifact.dart';
+export 'subscription.dart';
 export 'user.dart';

packages/shorebird_code_push_protocol/lib/src/models/subscription.dart

@@ -0,0 +1,36 @@
+import 'package:json_annotation/json_annotation.dart';
+import 'package:shorebird_code_push_protocol/shorebird_code_push_protocol.dart';
+
+part 'subscription.g.dart';
+
+/// {@template subscription}
+/// A user's Shorebird subscription.
+/// {@endtemplate}
+@JsonSerializable()
+class Subscription {
+  /// {@macro subscription}
+  Subscription({
+    required this.cost,
+    required this.paidThroughDate,
+    required this.willRenew,
+  });
+
+  /// Creates a [Subscription] from a JSON object.
+  factory Subscription.fromJson(Json json) => _$SubscriptionFromJson(json);
+
+  /// Converts a [Subscription] to a JSON object.
+  Json toJson() => _$SubscriptionToJson(this);
+
+  /// Billing rate, in cents.
+  final int cost;
+
+  /// When the subscription will be renewed or expire.
+  @TimestampConverter()
+  final DateTime paidThroughDate;
+
+  /// Whether this subscription will renew on [paidThroughDate].
+  final bool willRenew;
+
+  /// Whether this subscription is currently active.
+  bool get isActive => paidThroughDate.isAfter(DateTime.now());
+}

packages/shorebird_code_push_protocol/test/src/models/subscription_test.dart

@@ -0,0 +1,38 @@
+import 'package:shorebird_code_push_protocol/shorebird_code_push_protocol.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group(Subscription, () {
+    test('can be (de)serialized', () {
+      final subscription = Subscription(
+        cost: 100,
+        paidThroughDate: DateTime.now(),
+        willRenew: true,
+      );
+      expect(
+        Subscription.fromJson(subscription.toJson()).toJson(),
+        equals(subscription.toJson()),
+      );
+    });
+
+    group('isActive', () {
+      test('returns true if paidThroughDate is in the future', () {
+        final subscription = Subscription(
+          cost: 100,
+          paidThroughDate: DateTime.now().add(const Duration(days: 1)),
+          willRenew: true,
+        );
+        expect(subscription.isActive, isTrue);
+      });
+
+      test('returns false if paidThroughDate is in the past', () {
+        final subscription = Subscription(
+          cost: 100,
+          paidThroughDate: DateTime.now().subtract(const Duration(days: 1)),
+          willRenew: true,
+        );
+        expect(subscription.isActive, isFalse);
+      });
+    });
+  });
+}

packages/shorebird_code_push_protocol/test/src/models/user_test.dart

@@ -4,7 +4,10 @@ import 'package:test/test.dart';
 void main() {
   group('User', () {
     test('can be (de)serialized', () {
-      const user = User(id: 1, email: 'test@shorebird.dev');
+      const user = User(
+        id: 1,
+        email: 'test@shorebird.dev',
+      );
       expect(
         User.fromJson(user.toJson()).toJson(),
         equals(user.toJson()),