Show deprecation warning

lib/helpers/server_config_helper.dart

@@ -1,5 +1,6 @@
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/server_config.dart';
+import 'package:version/version.dart';
 
 /// Server configuration helper
 ///
@@ -20,6 +21,8 @@ class ServerConfigurationHelper {
     final dataConservationPolicy = response["data_conservation_policy"];
 
     _config = ServerConfig(
+      minSupportedMobileVersion:
+          Version.parse(response["min_supported_mobile_version"]),
       passwordPolicy: PasswordPolicy(
         allowMailInPassword: passwordPolicy["allow_email_in_password"],
         allowNameInPassword: passwordPolicy["allow_name_in_password"],

lib/helpers/version_helper.dart

@@ -1,4 +1,5 @@
 import 'package:package_info/package_info.dart';
+import 'package:version/version.dart';
 
 /// Application version helper
 ///
@@ -13,4 +14,7 @@ class VersionHelper {
 
   /// Get current version information
   static PackageInfo get info => _info;
+
+  /// Get current application version, in parsed format
+  static Version get version => Version.parse(info.version);
 }

lib/models/server_config.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/widgets.dart';
+import 'package:version/version.dart';
 
 /// Server static configuration
 ///
@@ -57,12 +58,15 @@ class ServerDataConservationPolicy {
 }
 
 class ServerConfig {
+  final Version minSupportedMobileVersion;
   final PasswordPolicy passwordPolicy;
   final ServerDataConservationPolicy dataConservationPolicy;
 
   const ServerConfig({
+    @required this.minSupportedMobileVersion,
     @required this.passwordPolicy,
     @required this.dataConservationPolicy,
-  })  : assert(passwordPolicy != null),
+  })  : assert(minSupportedMobileVersion != null),
+        assert(passwordPolicy != null),
         assert(dataConservationPolicy != null);
 }

lib/ui/dialogs/deprecation_dialog.dart

@@ -0,0 +1,28 @@
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Deprecation dialog
+///
+/// @author Pierre Hubert
+
+/// Show a dialog to warn the user this version of the application is deprecated
+Future<void> showDeprecationDialog(BuildContext context) async {
+  await showDialog(context: context, builder: (c) => _DeprecationDialog());
+}
+
+class _DeprecationDialog extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text(tr("Deprecated application version")),
+      content: Text(tr(
+          "This version of the mobile application is deprecated. You might still be able to use it, but some features will not work. We recommend you to update to the latest version of the application.")),
+      actions: [
+        MaterialButton(
+          onPressed: () => Navigator.pop(context),
+          child: Text(tr("OK")),
+        )
+      ],
+    );
+  }
+}

lib/ui/widgets/init_widget.dart

@@ -3,6 +3,7 @@ import 'package:comunic/helpers/events_helper.dart';
 import 'package:comunic/helpers/server_config_helper.dart';
 import 'package:comunic/helpers/version_helper.dart';
 import 'package:comunic/helpers/websocket_helper.dart';
+import 'package:comunic/ui/dialogs/deprecation_dialog.dart';
 import 'package:comunic/ui/routes/login_route.dart';
 import 'package:comunic/ui/routes/main_route/main_route.dart';
 import 'package:comunic/ui/routes/main_route/smartphone_route.dart';
@@ -62,6 +63,9 @@ class _InitializeWidgetState extends SafeState<InitializeWidget> {
     try {
       await ServerConfigurationHelper.ensureLoaded();
 
+      if (ServerConfigurationHelper.config.minSupportedMobileVersion > VersionHelper.version)
+        await showDeprecationDialog(context);
+
       if (!AccountHelper.isUserIDLoaded) {
         _popToMainRoute();
         _openLoginPage();

pubspec.lock

@@ -630,6 +630,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0-nullsafety.3"
+  version:
+    dependency: "direct main"
+    description:
+      name: version
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
   wakelock:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -88,6 +88,9 @@ dependencies:
   # Get information about current version
   package_info: ^0.4.3+4
 
+  # Version manager
+  version: ^1.2.0
+
 dev_dependencies:
   flutter_test:
     sdk: flutter