Start to display banner

lib/models/server_config.dart

@@ -1,3 +1,4 @@
+import 'package:comunic/utils/date_utils.dart';
 import 'package:flutter/widgets.dart';
 import 'package:version/version.dart';
 
@@ -132,6 +133,42 @@ class AccountInformationPolicy {
         assert(maxLocationLength != null);
 }
 
+enum BannerNature { Information, Warning, Success }
+
+extension BannerNatureExt on BannerNature {
+  static BannerNature fromStr(String s) {
+    switch (s) {
+      case "information":
+        return BannerNature.Information;
+      case "success":
+        return BannerNature.Success;
+      case "warning":
+      default:
+        return BannerNature.Warning;
+    }
+  }
+}
+
+class Banner {
+  final bool enabled;
+  final int expire;
+  final BannerNature nature;
+  final Map<String, String> message;
+  final String link;
+
+  const Banner({
+    @required this.enabled,
+    @required this.expire,
+    @required this.nature,
+    @required this.message,
+    @required this.link,
+  })  : assert(enabled != null),
+        assert(nature != null),
+        assert(message != null);
+
+  bool get visible => enabled && (expire == null || expire > time());
+}
+
 class ServerConfig {
   final Version minSupportedMobileVersion;
   final String termsURL;
@@ -139,6 +176,7 @@ class ServerConfig {
   final String contactEmail;
   final String playStoreURL;
   final String androidDirectDownloadURL;
+  final Banner banner;
   final NotificationsPolicy notificationsPolicy;
   final PasswordPolicy passwordPolicy;
   final ServerDataConservationPolicy dataConservationPolicy;
@@ -152,6 +190,7 @@ class ServerConfig {
     @required this.contactEmail,
     @required this.playStoreURL,
     @required this.androidDirectDownloadURL,
+    @required this.banner,
     @required this.notificationsPolicy,
     @required this.passwordPolicy,
     @required this.dataConservationPolicy,