[linting_tool] Add lint rules list (#856)

experimental/linting_tool/lib/repository/api_provider.dart

@@ -0,0 +1,26 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import 'package:linting_tool/model/rule.dart';
+
+class APIProvider {
+  final _baseURL = 'https://dart-lang.github.io/linter';
+  Future<List<Rule>> getRulesList() async {
+    http.Response response =
+        await http.get(Uri.parse('$_baseURL//lints/machine/rules.json'));
+
+    if (response.statusCode == 200) {
+      List<Rule> rulesList = [];
+      final data = json.decode(response.body) as List;
+      for (var item in data) {
+        rulesList.add(Rule.fromJson(item as Map<String, dynamic>));
+      }
+      return rulesList;
+    } else {
+      throw Exception('Failed to load rules');
+    }
+  }
+}

experimental/linting_tool/lib/repository/repository.dart

@@ -0,0 +1,12 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:linting_tool/model/rule.dart';
+import 'package:linting_tool/repository/api_provider.dart';
+
+class Repository {
+  final _apiProvider = APIProvider();
+
+  Future<List<Rule>> getRulesList() => _apiProvider.getRulesList();
+}