Added preferences backend (#465)

* Added preferences backend

* Gender -> Sex

* ClientPreferencesManager properties

* Username validation

* Fixed client init

* WIP db

* Actually working sqlite db

* Dropped shitty sqlite libraries, dropped DbUp, added MigrationManager

* Added profile deletion, test

* Docs, sanity, tests, cleanup

* Cleaned up profile and appearance, fixed running on .net core

Co-authored-by: Pieter-Jan Briers <pieterjan.briers@gmail.com>

Content.Server/Preferences/ServerPreferencesManager.cs

@@ -0,0 +1,103 @@
+using System.IO;
+using Content.Server.Interfaces;
+using Content.Shared.Preferences;
+using Robust.Server.Interfaces.Player;
+using Robust.Shared.Interfaces.Configuration;
+using Robust.Shared.Interfaces.Network;
+using Robust.Shared.Interfaces.Resources;
+using Robust.Shared.IoC;
+
+namespace Content.Server.Preferences
+{
+    /// <summary>
+    /// Sends <see cref="SharedPreferencesManager.MsgPreferencesAndSettings"/> before the client joins the lobby.
+    /// Receives <see cref="SharedPreferencesManager.MsgSelectCharacter"/> and <see cref="SharedPreferencesManager.MsgUpdateCharacter"/> at any time.
+    /// </summary>
+    public class ServerPreferencesManager : SharedPreferencesManager, IServerPreferencesManager
+    {
+#pragma warning disable 649
+        [Dependency] private readonly IServerNetManager _netManager;
+        [Dependency] private readonly IConfigurationManager _configuration;
+        [Dependency] private readonly IResourceManager _resourceManager;
+#pragma warning restore 649
+        private PreferencesDatabase _preferencesDb;
+
+        public void Initialize()
+        {
+            _netManager.RegisterNetMessage<MsgPreferencesAndSettings>(nameof(MsgPreferencesAndSettings));
+            _netManager.RegisterNetMessage<MsgSelectCharacter>(nameof(MsgSelectCharacter),
+                HandleSelectCharacterMessage);
+            _netManager.RegisterNetMessage<MsgUpdateCharacter>(nameof(MsgUpdateCharacter),
+                HandleUpdateCharacterMessage);
+
+            _configuration.RegisterCVar("game.maxcharacterslots", 10);
+            _configuration.RegisterCVar("game.preferencesdbpath", "preferences.db");
+
+            var configPreferencesDbPath = _configuration.GetCVar<string>("game.preferencesdbpath");
+            var finalPreferencesDbPath = Path.Combine(_resourceManager.UserData.RootDir, configPreferencesDbPath);
+
+            var maxCharacterSlots = _configuration.GetCVar<int>("game.maxcharacterslots");
+
+            _preferencesDb = new PreferencesDatabase(finalPreferencesDbPath, maxCharacterSlots);
+        }
+
+        private void HandleSelectCharacterMessage(MsgSelectCharacter message)
+        {
+            _preferencesDb.SaveSelectedCharacterIndex(message.MsgChannel.SessionId.Username, message.SelectedCharacterIndex);
+        }
+
+        private void HandleUpdateCharacterMessage(MsgUpdateCharacter message)
+        {
+            _preferencesDb.SaveCharacterSlot(message.MsgChannel.SessionId.Username, message.Profile, message.Slot);
+        }
+
+        public void OnClientConnected(IPlayerSession session)
+        {
+            var msg = _netManager.CreateNetMessage<MsgPreferencesAndSettings>();
+            msg.Preferences = GetPreferences(session.SessionId.Username);
+            msg.Settings = new GameSettings
+            {
+                MaxCharacterSlots = _configuration.GetCVar<int>("game.maxcharacterslots")
+            };
+            _netManager.ServerSendMessage(msg, session.ConnectedClient);
+        }
+
+        /// <summary>
+        /// Returns the requested <see cref="PlayerPreferences"/> or null if not found.
+        /// </summary>
+        private PlayerPreferences GetFromSql(string username)
+        {
+            return _preferencesDb.GetPlayerPreferences(username);
+        }
+
+        /// <summary>
+        /// Retrieves preferences for the given username from storage.
+        /// Creates and saves default preferences if they are not found, then returns them.
+        /// </summary>
+        public PlayerPreferences GetPreferences(string username)
+        {
+            var prefs = GetFromSql(username);
+            if (prefs is null)
+            {
+                prefs = PlayerPreferences.Default();  // TODO: Create random character instead
+                SavePreferences(prefs, username);
+            }
+
+            return prefs;
+        }
+
+        /// <summary>
+        /// Saves the given preferences to storage.
+        /// </summary>
+        public void SavePreferences(PlayerPreferences prefs, string username)
+        {
+            _preferencesDb.SaveSelectedCharacterIndex(username, prefs.SelectedCharacterIndex);
+            var index = 0;
+            foreach (var character in prefs.Characters)
+            {
+                _preferencesDb.SaveCharacterSlot(username, character, index);
+                index++;
+            }
+        }
+    }
+}