refactor(gh): query with get json

lib/models/auth.dart

@@ -394,17 +394,6 @@ class AuthModel with ChangeNotifier {
     return data['data'];
   }
 
-  Future<dynamic> getWithCredentials(String url) async {
-    final res = await http
-        .get(_apiPrefix + url, headers: _headers)
-        .timeout(_timeoutDuration);
-    final data = json.decode(res.body);
-    if (res.statusCode >= 400) {
-      throw data['message'];
-    }
-    return data;
-  }
-
   String _oauthState;
   void redirectToGithubOauth() {
     _oauthState = nanoid();

lib/models/github.dart

@@ -131,7 +131,6 @@ class GithubEventRelease {
 @JsonSerializable(fieldRename: FieldRename.snake)
 class GithubNotificationItem {
   String id;
-  String htmlUrl;
   GithubNotificationItemSubject subject;
   DateTime updatedAt;
   GithubNotificationItemRepo repository;

lib/models/github.g.dart

@@ -168,7 +168,6 @@ GithubNotificationItem _$GithubNotificationItemFromJson(
     Map<String, dynamic> json) {
   return GithubNotificationItem()
     ..id = json['id'] as String
-    ..htmlUrl = json['html_url'] as String
     ..subject = json['subject'] == null
         ? null
         : GithubNotificationItemSubject.fromJson(
@@ -187,7 +186,6 @@ Map<String, dynamic> _$GithubNotificationItemToJson(
         GithubNotificationItem instance) =>
     <String, dynamic>{
       'id': instance.id,
-      'html_url': instance.htmlUrl,
       'subject': instance.subject,
       'updated_at': instance.updatedAt?.toIso8601String(),
       'repository': instance.repository,

lib/screens/gh_news.dart

@@ -22,7 +22,8 @@ class GhNewsScreenState extends State<GhNewsScreen> {
       // Check if there are unread notification items.
       // 1 item is enough since count is not displayed for now.
       var items = await Provider.of<AuthModel>(context)
-          .getWithCredentials('/notifications?per_page=1');
+          .ghClient
+          .getJSON('/notifications?per_page=1');
 
       if (items is List && items.isNotEmpty) {
         Provider.of<NotificationModel>(context).setCount(1);
@@ -33,15 +34,14 @@ class GhNewsScreenState extends State<GhNewsScreen> {
   Future<ListPayload<GithubEvent, int>> fetchEvents([int page = 1]) async {
     final auth = Provider.of<AuthModel>(context);
     final login = auth.activeAccount.login;
-    List data = await auth.getWithCredentials(
-        '/users/$login/received_events?page=$page&per_page=$pageSize');
-    // Fimber.d(data.length);
-    var hasMore = data.length == pageSize;
-    var events = data.map((item) => GithubEvent.fromJson(item)).toList();
 
+    final events = await auth.ghClient.getJSON(
+      '/users/$login/received_events?page=$page&per_page=$pageSize',
+      convert: (vs) => [for (var v in vs) GithubEvent.fromJson(v)],
+    );
     return ListPayload(
       cursor: page + 1,
-      hasMore: hasMore,
+      hasMore: events.length == pageSize,
       items: events,
     );
   }

lib/screens/gh_notification.dart

@@ -21,11 +21,11 @@ class GhNotificationScreen extends StatefulWidget {
 
 class GhNotificationScreenState extends State<GhNotificationScreen> {
   Future<Map<String, NotificationGroup>> fetchNotifications(int index) async {
-    List items = await Provider.of<AuthModel>(context).getWithCredentials(
-        '/notifications?all=${index == 2}&participating=${index == 1}');
-    final ns =
-        items.map((item) => GithubNotificationItem.fromJson(item)).toList();
-
+    final ns = await Provider.of<AuthModel>(context).ghClient.getJSON(
+          '/notifications?all=${index == 2}&participating=${index == 1}',
+          convert: (vs) =>
+              [for (var v in vs) GithubNotificationItem.fromJson(v)],
+        );
     if (index == 0) {
       Provider.of<NotificationModel>(context).setCount(ns.length);
     }