Reject more invalid usernames from clients.

Specifically this should cover people connecting with a username of
"\u200C"

cockatrice/src/window_main.cpp

@@ -76,6 +76,7 @@ void MainWindow::processConnectionClosedEvent(const Event_ConnectionClosed &even
 			break;
 		}
 		case Event_ConnectionClosed::SERVER_SHUTDOWN: reasonStr = tr("Scheduled server shutdown."); break;
+		case Event_ConnectionClosed::USERNAMEINVALID: reasonStr = tr("Invalid username."); break;
 		default: reasonStr = QString::fromStdString(event.reason_str());
 	}
 	QMessageBox::critical(this, tr("Connection closed"), tr("The server has terminated your connection.\nReason: %1").arg(reasonStr));
@@ -257,6 +258,9 @@ void MainWindow::loginError(Response::ResponseCode r, QString reasonStr, quint32
 			QMessageBox::critical(this, tr("Error"), bannedStr);
 			break;
 		}
+		case Response::RespUserIsBanned:
+			QMessageBox::critical(this, tr("Error"), tr("Invalid username."));
+			break;
 		default:
 			QMessageBox::critical(this, tr("Error"), tr("Unknown login error: %1").arg(static_cast<int>(r)));
 	}

common/pb/event_connection_closed.proto

@@ -9,6 +9,7 @@ message Event_ConnectionClosed {
 		SERVER_SHUTDOWN = 2;
 		TOO_MANY_CONNECTIONS = 3;
 		BANNED = 4;
+		USERNAMEINVALID = 5;
 	}
 	optional CloseReason reason = 1;
 	optional string reason_str = 2;

common/pb/response.proto

@@ -22,6 +22,7 @@ message Response {
 		RespChatFlood = 18;
 		RespUserIsBanned = 19;
 		RespAccessDenied = 20;
+		RespUsernameInvalid = 21;
 	}
 	enum ResponseType {
 		JOIN_ROOM = 1000;

common/server.cpp

@@ -114,7 +114,7 @@ AuthenticationResult Server::loginUser(Server_ProtocolHandler *session, QString
 	QWriteLocker locker(&clientsLock);
 	
 	AuthenticationResult authState = databaseInterface->checkUserPassword(session, name, password, reasonStr, secondsLeft);
-	if ((authState == NotLoggedIn) || (authState == UserIsBanned))
+	if ((authState == NotLoggedIn) || (authState == UserIsBanned || authState == UsernameInvalid))
 		return authState;
 	
 	ServerInfo_User data = databaseInterface->getUserData(name, true);

common/server.h

@@ -27,7 +27,7 @@ class GameEventContainer;
 class CommandContainer;
 class Command_JoinGame;
 
-enum AuthenticationResult { NotLoggedIn = 0, PasswordRight = 1, UnknownUser = 2, WouldOverwriteOldSession = 3, UserIsBanned = 4 };
+enum AuthenticationResult { NotLoggedIn = 0, PasswordRight = 1, UnknownUser = 2, WouldOverwriteOldSession = 3, UserIsBanned = 4, UsernameInvalid = 5 };
 
 class Server : public QObject
 {

common/server_protocolhandler.cpp

@@ -200,11 +200,11 @@ Response::ResponseCode Server_ProtocolHandler::processGameCommandContainer(const
 	if (!game) {
 		if (room->getExternalGames().contains(cont.game_id())) {
 			server->sendIsl_GameCommand(cont,
-			                            room->getExternalGames().value(cont.game_id()).server_id(),
-			                            userInfo->session_id(),
-			                            roomIdAndPlayerId.first,
-			                            roomIdAndPlayerId.second
-			                            );
+										room->getExternalGames().value(cont.game_id()).server_id(),
+										userInfo->session_id(),
+										roomIdAndPlayerId.first,
+										roomIdAndPlayerId.second
+										);
 			return Response::RespNothing;
 		}
 		return Response::RespNotInRoom;
@@ -338,6 +338,7 @@ Response::ResponseCode Server_ProtocolHandler::cmdLogin(const Command_Login &cmd
 		}
 		case NotLoggedIn: return Response::RespWrongPassword;
 		case WouldOverwriteOldSession: return Response::RespWouldOverwriteOldSession;
+		case UsernameInvalid: return Response::RespUsernameInvalid;
 		default: authState = res;
 	}
 	

servatrice/src/servatrice_database_interface.cpp

@@ -73,6 +73,21 @@ bool Servatrice_DatabaseInterface::execSqlQuery(QSqlQuery &query)
 	return false;
 }
 
+bool Servatrice_DatabaseInterface::usernameIsValid(const QString &user)
+{
+	QString result;
+	result.reserve(user.size());
+	foreach (const QChar& c, user) {
+		switch (c.category()) {
+		// TODO: Figure out exactly which categories are OK and not
+		case QChar::Other_Control: break;
+		default: result += c;
+		}
+	}
+	result = result.trimmed();
+	return (result.size() > 0);
+}
+
 AuthenticationResult Servatrice_DatabaseInterface::checkUserPassword(Server_ProtocolHandler *handler, const QString &user, const QString &password, QString &reasonStr, int &banSecondsLeft)
 {
 	switch (server->getAuthenticationMethod()) {
@@ -80,6 +95,9 @@ AuthenticationResult Servatrice_DatabaseInterface::checkUserPassword(Server_Prot
 	case Servatrice::AuthenticationSql: {
 		if (!checkSql())
 			return UnknownUser;
+
+		if (!usernameIsValid(user))
+			return UsernameInvalid;
 		
 		QSqlQuery ipBanQuery(sqlDatabase);
 		ipBanQuery.prepare("select time_to_sec(timediff(now(), date_add(b.time_from, interval b.minutes minute))), b.minutes <=> 0, b.visible_reason from " + server->getDbPrefix() + "_bans b where b.time_from = (select max(c.time_from) from " + server->getDbPrefix() + "_bans c where c.ip_address = :address) and b.ip_address = :address2");

servatrice/src/servatrice_database_interface.h

@@ -16,6 +16,7 @@ private:
 	QSqlDatabase sqlDatabase;
 	Servatrice *server;
 	ServerInfo_User evalUserQueryResult(const QSqlQuery &query, bool complete, bool withId = false);
+	bool usernameIsValid(const QString &user);
 protected:
 	AuthenticationResult checkUserPassword(Server_ProtocolHandler *handler, const QString &user, const QString &password, QString &reasonStr, int &secondsLeft);
 public slots: