From a443eccd6c8b0f4551d15ee60a8ad6510ed68275 Mon Sep 17 00:00:00 2001
From: Dat PHAM HOANG <dphamhoang@linagora.com>
Date: Sat, 15 Oct 2022 00:09:33 +0700
Subject: [PATCH] TF-1018 Add abstract Config loader and parser

---
 core/lib/core.dart                           |  3 ++
 core/lib/utils/config/app_config_loader.dart | 34 ++++++++++++++++++++
 core/lib/utils/config/app_config_parser.dart |  8 +++++
 core/lib/utils/config/errors.dart            |  7 ++++
 4 files changed, 52 insertions(+)
 create mode 100644 core/lib/utils/config/app_config_loader.dart
 create mode 100644 core/lib/utils/config/app_config_parser.dart
 create mode 100644 core/lib/utils/config/errors.dart

diff --git a/core/lib/core.dart b/core/lib/core.dart
index 4fb0481fa..2c90072fb 100644
--- a/core/lib/core.dart
+++ b/core/lib/core.dart
@@ -36,6 +36,9 @@ export 'utils/benchmark.dart';
 export 'utils/fps_manager.dart';
 export 'utils/build_utils.dart';
 export 'utils/string_convert.dart';
+export 'utils/config/app_config_loader.dart';
+export 'utils/config/app_config_parser.dart';
+export 'utils/config/errors.dart';
 export 'data/utils/compress_file_utils.dart';
 
 // Views
diff --git a/core/lib/utils/config/app_config_loader.dart b/core/lib/utils/config/app_config_loader.dart
new file mode 100644
index 000000000..b82117645
--- /dev/null
+++ b/core/lib/utils/config/app_config_loader.dart
@@ -0,0 +1,34 @@
+import 'package:core/utils/config/app_config_parser.dart';
+import 'package:core/utils/config/errors.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter/services.dart' show rootBundle;
+
+class AppConfigLoader {
+  Future<T> load<T>(String fileName, AppConfigParser parser) async {
+    try {
+      WidgetsFlutterBinding.ensureInitialized();
+      var envString = await rootBundle.loadString(fileName);
+      if (envString.isEmpty) {
+        throw EmptyConfiguration();
+      }
+
+      return await parser.parse(envString);
+    } on FlutterError {
+      throw ConfigurationNotFoundError();
+    }
+  }
+
+  Future<T> loadData<T>(String fileName, AppConfigParser parser) async {
+    try {
+      WidgetsFlutterBinding.ensureInitialized();
+      var envData = await rootBundle.load(fileName);
+      if (envData.lengthInBytes == 0) {
+        throw EmptyConfiguration();
+      }
+
+      return await parser.parseData(envData);
+    } on FlutterError {
+      throw ConfigurationNotFoundError();
+    }
+  }
+}
\ No newline at end of file
diff --git a/core/lib/utils/config/app_config_parser.dart b/core/lib/utils/config/app_config_parser.dart
new file mode 100644
index 000000000..d86b5f4a6
--- /dev/null
+++ b/core/lib/utils/config/app_config_parser.dart
@@ -0,0 +1,8 @@
+import 'dart:async';
+
+import 'package:flutter/services.dart';
+
+abstract class AppConfigParser<T> {
+  Future<T> parse(String value);
+  Future<T> parseData(ByteData data);
+}
\ No newline at end of file
diff --git a/core/lib/utils/config/errors.dart b/core/lib/utils/config/errors.dart
new file mode 100644
index 000000000..60f30a2e7
--- /dev/null
+++ b/core/lib/utils/config/errors.dart
@@ -0,0 +1,7 @@
+class NotInitializedError implements Exception {}
+
+class ConfigurationNotFoundError implements Exception {}
+
+class EmptyConfiguration implements Exception {}
+
+class InvalidConfigurationParser implements Exception {}
\ No newline at end of file