Start to integrate data conservation policy

lib/helpers/server_config_helper.dart

@@ -0,0 +1,44 @@
+import 'package:comunic/models/api_request.dart';
+import 'package:comunic/models/server_config.dart';
+
+/// Server configuration helper
+///
+/// @author Pierre Hubert
+
+class ServerConfigurationHelper {
+  static ServerConfig _config;
+
+  /// Make sure the configuration has been correctly loaded
+  static Future<void> ensureLoaded() async {
+    if (_config != null) return;
+
+    final response =
+        (await APIRequest.withoutLogin("server/config").execWithThrow())
+            .getObject();
+
+    final dataConservationPolicy = response["data_conservation_policy"];
+
+    _config = ServerConfig(
+      dataConservationPolicy: ServerDataConservationPolicy(
+        minInactiveAccountLifetime:
+            dataConservationPolicy["min_inactive_account_lifetime"],
+        minNotificationLifetime:
+            dataConservationPolicy["min_notification_lifetime"],
+        minCommentsLifetime: dataConservationPolicy["min_comments_lifetime"],
+        minPostsLifetime: dataConservationPolicy["min_posts_lifetime"],
+        minConversationMessagesLifetime:
+            dataConservationPolicy["min_conversation_messages_lifetime"],
+        minLikesLifetime: dataConservationPolicy["min_likes_lifetime"],
+      ),
+    );
+  }
+
+  /// Get current server configuration, throwing if it is not loaded yet
+  static ServerConfig get config {
+    if (_config == null)
+      throw Exception(
+          "Trying to access server configuration but it is not loaded yet!");
+
+    return _config;
+  }
+}

lib/helpers/settings_helper.dart

@@ -1,6 +1,7 @@
 import 'package:comunic/enums/user_page_visibility.dart';
 import 'package:comunic/models/account_image_settings.dart';
 import 'package:comunic/models/api_request.dart';
+import 'package:comunic/models/data_conservation_policy_settings.dart';
 import 'package:comunic/models/general_settings.dart';
 import 'package:comunic/models/new_emoji.dart';
 import 'package:comunic/models/security_settings.dart';
@@ -193,4 +194,42 @@ class SettingsHelper {
         .addString("security_answer_2", newSettings.securityAnswer2)
         .execWithThrow();
   }
+
+  /// Get account data conservation policy settings
+  ///
+  /// Throws in case of failure
+  static Future<DataConservationPolicySettings>
+      getDataConservationPolicy() async {
+    final response =
+        (await APIRequest.withLogin("settings/get_data_conservation_policy")
+                .execWithThrow())
+            .getObject();
+
+    return DataConservationPolicySettings(
+        inactiveAccountLifeTime: response["inactive_account_lifetime"],
+        notificationLifetime: response["notification_lifetime"],
+        commentsLifetime: response["comments_lifetime"],
+        postsLifetime: response["posts_lifetime"],
+        conversationMessagesLifetime:
+            response["conversation_messages_lifetime"],
+        likesLifetime: response["likes_lifetime"]);
+  }
+
+  /// Apply new data conservation policy settings
+  ///
+  /// Throws in case of failure
+  static Future<void> setDataConservationPolicy(
+      String password, DataConservationPolicySettings newSettings) async {
+    await APIRequest(uri: "settings/set_data_conservation_policy", needLogin: true)
+        .addString("password", password)
+        .addInt("inactive_account_lifetime",
+            newSettings.inactiveAccountLifeTime ?? 0)
+        .addInt("notification_lifetime", newSettings.notificationLifetime ?? 0)
+        .addInt("comments_lifetime", newSettings.commentsLifetime ?? 0)
+        .addInt("posts_lifetime", newSettings.postsLifetime ?? 0)
+        .addInt("conversation_messages_lifetime",
+            newSettings.conversationMessagesLifetime ?? 0)
+        .addInt("likes_lifetime", newSettings.likesLifetime ?? 0)
+        .execWithThrow();
+  }
 }

lib/models/data_conservation_policy_settings.dart

@@ -0,0 +1,21 @@
+/// Data conservation policy settings
+///
+/// @author Pierre Hubert
+
+class DataConservationPolicySettings {
+  int inactiveAccountLifeTime;
+  int notificationLifetime;
+  int commentsLifetime;
+  int postsLifetime;
+  int conversationMessagesLifetime;
+  int likesLifetime;
+
+  DataConservationPolicySettings({
+    this.inactiveAccountLifeTime,
+    this.notificationLifetime,
+    this.commentsLifetime,
+    this.postsLifetime,
+    this.conversationMessagesLifetime,
+    this.likesLifetime,
+  });
+}

lib/models/server_config.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/widgets.dart';
+
+/// Server static configuration
+///
+/// @author Pierre Hubert
+
+class ServerDataConservationPolicy {
+  final int minInactiveAccountLifetime;
+  final int minNotificationLifetime;
+  final int minCommentsLifetime;
+  final int minPostsLifetime;
+  final int minConversationMessagesLifetime;
+  final int minLikesLifetime;
+
+  const ServerDataConservationPolicy({
+    @required this.minInactiveAccountLifetime,
+    @required this.minNotificationLifetime,
+    @required this.minCommentsLifetime,
+    @required this.minPostsLifetime,
+    @required this.minConversationMessagesLifetime,
+    @required this.minLikesLifetime,
+  })  : assert(minInactiveAccountLifetime != null),
+        assert(minNotificationLifetime != null),
+        assert(minCommentsLifetime != null),
+        assert(minPostsLifetime != null),
+        assert(minConversationMessagesLifetime != null),
+        assert(minLikesLifetime != null);
+}
+
+class ServerConfig {
+  final ServerDataConservationPolicy dataConservationPolicy;
+
+  const ServerConfig({
+    @required this.dataConservationPolicy,
+  }) : assert(dataConservationPolicy != null);
+}

lib/ui/routes/settings/account_privacy_settings.dart

@@ -1,6 +1,13 @@
 import 'package:comunic/helpers/account_helper.dart';
+import 'package:comunic/helpers/server_config_helper.dart';
+import 'package:comunic/helpers/settings_helper.dart';
+import 'package:comunic/models/data_conservation_policy_settings.dart';
+import 'package:comunic/models/server_config.dart';
 import 'package:comunic/ui/dialogs/input_user_password_dialog.dart';
+import 'package:comunic/ui/dialogs/multi_choices_dialog.dart';
+import 'package:comunic/ui/widgets/async_screen_widget.dart';
 import 'package:comunic/ui/widgets/settings/header_spacer_section.dart';
+import 'package:comunic/ui/widgets/settings/multi_choices_settings_tile.dart';
 import 'package:comunic/utils/intl_utils.dart';
 import 'package:comunic/utils/ui_utils.dart';
 import 'package:flutter/cupertino.dart';
@@ -17,19 +24,68 @@ class AccountPrivacySettings extends StatefulWidget {
 }
 
 class _AccountPrivacySettingsState extends State<AccountPrivacySettings> {
+  final _key = GlobalKey<AsyncScreenWidgetState>();
+  ServerConfig _serverConfig;
+  DataConservationPolicySettings _userSettings;
+  String _cachedPassword;
+
+  Future<void> _loadSettings() async {
+    await ServerConfigurationHelper.ensureLoaded();
+    _serverConfig = ServerConfigurationHelper.config;
+    _userSettings = await SettingsHelper.getDataConservationPolicy();
+  }
+
   @override
   Widget build(BuildContext context) {
-    return SettingsList(sections: [
+    return AsyncScreenWidget(
+      key: _key,
+      onReload: _loadSettings,
+      onBuild: () => SettingsList(sections: [
         HeadSpacerSection(),
-      SettingsSection(title: tr("Privacy settings"), tiles: [
+        SettingsSection(
+          title: tr("Data conservation policy"),
+          tiles: _dataConservationPolicyTiles,
+        ),
+        SettingsSection(title: tr("Danger zone"), tiles: [
           SettingsTile(
             title: tr("Delete your account"),
-          subtitle:
+            subtitle: tr(
-              tr("Permanently delete your account and all data related to it."),
+                "Permanently delete your account and all data related to it."),
             onPressed: (_) => _deleteAccount(),
           )
         ])
-    ]);
+      ]),
+      errorMessage: tr("Failed to load privacy settings!"),
+    );
+  }
+
+  List<SettingsTile> get _dataConservationPolicyTiles => [
+        DataConservationPolicyTile(
+          value: _userSettings.notificationLifetime,
+          title: tr("Automatically delete unread notification after"),
+          onChange: (val) {
+            _userSettings.notificationLifetime = val;
+            _updateDataConservationPolicy();
+          },
+          minValue:
+              _serverConfig.dataConservationPolicy.minNotificationLifetime,
+        ),
+      ];
+
+  void _updateDataConservationPolicy() async {
+    try {
+      if (_cachedPassword == null)
+        _cachedPassword = await showUserPasswordDialog(context);
+
+      await SettingsHelper.setDataConservationPolicy(
+          _cachedPassword, _userSettings);
+
+      _key.currentState.refresh();
+    } catch (e, s) {
+      print("Could not update data conservation policy! $e\n$s");
+      showSimpleSnack(
+          context, tr("Failed to update data conservation policy!"));
+    }
   }
 
   /// Permanently delete user account
@@ -61,6 +117,98 @@ class _AccountPrivacySettingsState extends State<AccountPrivacySettings> {
   }
 }
 
+class DataConservationPolicyTile extends SettingsTile {
+  final int value;
+  final String title;
+  final Function(int) onChange;
+  final int minValue;
+
+  const DataConservationPolicyTile({
+    @required this.value,
+    @required this.title,
+    @required this.onChange,
+    @required this.minValue,
+  })  : assert(title != null),
+        assert(onChange != null),
+        assert(minValue != null);
+
+  @override
+  Widget build(BuildContext context) {
+    return MultiChoicesSettingsTile(
+      title: title,
+      choices: _choices,
+      currentValue: _roundValue,
+      onChanged: onChange,
+    );
+  }
+
+  int get _day => 60 * 60 * 24;
+
+  int get _month => _day * 30;
+
+  int get _year => _day * 365;
+
+  int get _roundValue {
+    if (this.value == null) return 0;
+
+    return _choices.firstWhere((element) => element.id >= this.value).id;
+  }
+
+  List<MultiChoiceEntry<int>> get _choices => [
+        MultiChoiceEntry(id: 0, title: tr("Never"), hidden: false),
+        MultiChoiceEntry(
+          id: _day * 7,
+          title: tr("7 days"),
+          hidden: _day * 7 < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _day * 15,
+          title: tr("15 days"),
+          hidden: _day * 15 < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _month,
+          title: tr("1 month"),
+          hidden: _month < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _month * 3,
+          title: tr("3 months"),
+          hidden: _month * 3 < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _month * 6,
+          title: tr("6 months"),
+          hidden: _month * 6 < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _year,
+          title: tr("1 year"),
+          hidden: _year < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _year * 2,
+          title: tr("2 years"),
+          hidden: _year * 5 < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _year * 5,
+          title: tr("5 years"),
+          hidden: _year * 5 < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _year * 10,
+          title: tr("10 years"),
+          hidden: _year * 10 < minValue,
+        ),
+        MultiChoiceEntry(
+          id: _year * 50,
+          title: tr("50 years"),
+          hidden: _year * 50 < minValue,
+        ),
+      ];
+}
+
 class _LastChanceDeleteAccountDialog extends StatelessWidget {
   @override
   Widget build(BuildContext context) {