add user-agent for dart

Author: everly-gif

templates/dart/lib/src/client_io.dart.twig

@@ -2,6 +2,7 @@ import 'dart:io';
 import 'dart:math';
 import 'package:http/http.dart' as http;
 import 'package:package_info_plus/package_info_plus.dart';
+import 'package:device_info_plus/device_info_plus.dart';
 import 'package:http/io_client.dart';
 import 'client_mixin.dart';
 import 'client_base.dart';
@@ -89,6 +90,59 @@ class ClientIO extends ClientBase with ClientMixin {
     _headers![key] = value;
     return this;
   }
+  
+  Future init() async {
+    if (_initProgress) return;
+    _initProgress = true;
+    final Directory cookieDir = await _getCookiePath();
+    _cookieJar = PersistCookieJar(storage: FileStorage(cookieDir.path));
+    _interceptors.add(CookieManager(_cookieJar));
+
+    var device = '';
+    try {
+      PackageInfo packageInfo = await PackageInfo.fromPlatform();
+      addHeader(
+        'Origin',
+        '{{spec.title | caseLower}}-${Platform.operatingSystem}://${packageInfo.packageName}',
+      );
+
+      //creating custom user agent
+      DeviceInfoPlugin deviceInfoPlugin = DeviceInfoPlugin();
+      if (Platform.isAndroid) {
+        final andinfo = await deviceInfoPlugin.androidInfo;
+        device =
+            '(Linux; U; Android ${andinfo.version.release}; ${andinfo.brand} ${andinfo.model})';
+      }
+      if (Platform.isIOS) {
+        final iosinfo = await deviceInfoPlugin.iosInfo;
+        device = '${iosinfo.utsname.machine} iOS/${iosinfo.systemVersion}';
+      }
+      if (Platform.isLinux) {
+        final lininfo = await deviceInfoPlugin.linuxInfo;
+        device = '(Linux; U; ${lininfo.id} ${lininfo.version})';
+      }
+      if (Platform.isWindows) {
+        final wininfo = await deviceInfoPlugin.windowsInfo;
+        device =
+            '(Windows NT; ${wininfo.computerName})'; //can't seem to get much info here
+      }
+      if (Platform.isMacOS) {
+        final macinfo = await deviceInfoPlugin.macOsInfo;
+        device = '(Macintosh; ${macinfo.model})';
+      }
+      addHeader(
+        'user-agent',
+        '${packageInfo.packageName}/${packageInfo.version} $device',
+      );
+    } catch (e) {
+      debugPrint('Error getting device info: $e');
+      device = Platform.operatingSystem;
+      addHeader('user-agent', '$device');
+    }
+
+    _initialized = true;
+    _initProgress = false;
+  }
 
   @override
   Future<Response> chunkedUpload({