PrismLauncher/launcher/minecraft/launch/MinecraftServerTarget.cpp

/* Copyright 2013-2021 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "MinecraftServerTarget.h"

#include <QStringList>

// FIXME: the way this is written, it can't ever do any sort of validation and can accept total junk
MinecraftServerTarget MinecraftServerTarget::parse(const QString &fullAddress) {
    QStringList split = fullAddress.split(":");

    // The logic below replicates the exact logic minecraft uses for parsing server addresses.
    // While the conversion is not lossless and eats errors, it ensures the same behavior
    // within Minecraft and PolyMC when entering server addresses.
    if (fullAddress.startsWith("["))
    {
        int bracket = fullAddress.indexOf("]");
        if (bracket > 0)
        {
            QString ipv6 = fullAddress.mid(1, bracket - 1);
            QString port = fullAddress.mid(bracket + 1).trimmed();

            if (port.startsWith(":") && !ipv6.isEmpty())
            {
                port = port.mid(1);
                split = QStringList({ ipv6, port });
            }
            else
            {
                split = QStringList({ipv6});
            }
        }
    }

    if (split.size() > 2)
    {
        split = QStringList({fullAddress});
    }

    QString realAddress = split[0];

    quint16 realPort = 25565;
    if (split.size() > 1)
    {
        bool ok;
        realPort = split[1].toUInt(&ok);

        if (!ok)
        {
            realPort = 25565;
        }
    }

    return MinecraftServerTarget { realAddress, realPort };
}