Make web compatible calls for locale and skip PackageInfo (#395)

* Make web compatible calls for locale and skip PackageInfo

* Also get country code for web locale

* Add description of early web support

Author: nstrelow

README.md

@@ -49,6 +49,15 @@ It's possible to add other parameters to work with your instance of Parse Server
 	coreStore: await CoreStoreSharedPrefsImp.getInstance()); // Local data storage method. Will use SharedPreferences instead of Sembast as an internal DB
 ```
 
+
+#### Early Web support
+Currently this requires adding `X-Parse-Installation-Id` as an allowed header to parse-server.
+When running directly via docker, set the env var `PARSE_SERVER_ALLOW_HEADERS=X-Parse-Installation-Id`.
+When running via express, set [ParseServerOptions](https://parseplatform.org/parse-server/api/master/ParseServerOptions.html) `allowHeader: ['X-Parse-Installation-Id']`.
+
+Be aware that for web ParseInstallation does include app name, version or package identifier.
+
+
 ## Objects
 You can create custom objects by calling:
 ```dart

lib/parse_server_sdk.dart

@@ -5,6 +5,7 @@ import 'dart:convert';
 import 'dart:io';
 import 'dart:math';
 import 'dart:typed_data';
+import 'dart:ui' as ui;
 
 import 'package:devicelocale/devicelocale.dart';
 import 'package:flutter/foundation.dart' show kIsWeb;

lib/src/objects/parse_installation.dart

@@ -83,18 +83,20 @@ class ParseInstallation extends ParseObject {
     }
 
     //Locale
-    final String locale = await Devicelocale.currentLocale;
+    final String locale = kIsWeb ? ui.window.locale.toString() : await Devicelocale.currentLocale;
     if (locale != null && locale.isNotEmpty) {
       set<String>(keyLocaleIdentifier, locale);
     }
 
     //Timezone
 
     //App info
-    final PackageInfo packageInfo = await PackageInfo.fromPlatform();
-    set<String>(keyAppName, packageInfo.appName);
-    set<String>(keyAppVersion, packageInfo.version);
-    set<String>(keyAppIdentifier, packageInfo.packageName);
+    if (!kIsWeb) {
+      final PackageInfo packageInfo = await PackageInfo.fromPlatform();
+      set<String>(keyAppName, packageInfo.appName);
+      set<String>(keyAppVersion, packageInfo.version);
+      set<String>(keyAppIdentifier, packageInfo.packageName);
+    }
     set<String>(keyParseVersion, keySdkVersion);
   }