6 files changed, 746 insertions, 0 deletions
diff --git a/launcher/minecraft/legacy/LegacyInstance.cpp b/launcher/minecraft/legacy/LegacyInstance.cpp
new file mode 100644
index 00000000..9f9bda5a
--- /dev/null
+++ b/launcher/minecraft/legacy/LegacyInstance.cpp
@@ -0,0 +1,256 @@
+/* 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 <QFileInfo>
+#include <minecraft/launch/LauncherPartLaunch.h>
+#include <QDir>
+#include <settings/Setting.h>
+
+#include "LegacyInstance.h"
+
+#include "minecraft/legacy/LegacyModList.h"
+#include "minecraft/WorldList.h"
+#include <MMCZip.h>
+#include <FileSystem.h>
+
+LegacyInstance::LegacyInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir)
+    : BaseInstance(globalSettings, settings, rootDir)
+{
+    settings->registerSetting("NeedsRebuild", true);
+    settings->registerSetting("ShouldUpdate", false);
+    settings->registerSetting("JarVersion", QString());
+    settings->registerSetting("IntendedJarVersion", QString());
+    /*
+     * custom base jar has no default. it is determined in code... see the accessor methods for
+     *it
+     *
+     * for instances that DO NOT have the CustomBaseJar setting (legacy instances),
+     * [.]minecraft/bin/mcbackup.jar is the default base jar
+     */
+    settings->registerSetting("UseCustomBaseJar", true);
+    settings->registerSetting("CustomBaseJar", "");
+}
+
+QString LegacyInstance::mainJarToPreserve() const
+{
+    bool customJar = m_settings->get("UseCustomBaseJar").toBool();
+    if(customJar)
+    {
+        auto base = baseJar();
+        if(QFile::exists(base))
+        {
+            return base;
+        }
+    }
+    auto runnable = runnableJar();
+    if(QFile::exists(runnable))
+    {
+        return runnable;
+    }
+    return QString();
+}
+
+
+QString LegacyInstance::baseJar() const
+{
+    bool customJar = m_settings->get("UseCustomBaseJar").toBool();
+    if (customJar)
+    {
+        return customBaseJar();
+    }
+    else
+        return defaultBaseJar();
+}
+
+QString LegacyInstance::customBaseJar() const
+{
+    QString value = m_settings->get("CustomBaseJar").toString();
+    if (value.isNull() || value.isEmpty())
+    {
+        return defaultCustomBaseJar();
+    }
+    return value;
+}
+
+bool LegacyInstance::shouldUseCustomBaseJar() const
+{
+    return m_settings->get("UseCustomBaseJar").toBool();
+}
+
+
+shared_qobject_ptr<Task> LegacyInstance::createUpdateTask(Net::Mode)
+{
+    return nullptr;
+}
+
+std::shared_ptr<LegacyModList> LegacyInstance::jarModList() const
+{
+    if (!jar_mod_list)
+    {
+        auto list = new LegacyModList(jarModsDir(), modListFile());
+        jar_mod_list.reset(list);
+    }
+    jar_mod_list->update();
+    return jar_mod_list;
+}
+
+QString LegacyInstance::gameRoot() const
+{
+    QFileInfo mcDir(FS::PathCombine(instanceRoot(), "minecraft"));
+    QFileInfo dotMCDir(FS::PathCombine(instanceRoot(), ".minecraft"));
+
+    if (mcDir.exists() && !dotMCDir.exists())
+        return mcDir.filePath();
+    else
+        return dotMCDir.filePath();
+}
+
+QString LegacyInstance::binRoot() const
+{
+    return FS::PathCombine(gameRoot(), "bin");
+}
+
+QString LegacyInstance::jarModsDir() const
+{
+    return FS::PathCombine(instanceRoot(), "instMods");
+}
+
+QString LegacyInstance::libDir() const
+{
+    return FS::PathCombine(gameRoot(), "lib");
+}
+
+QString LegacyInstance::savesDir() const
+{
+    return FS::PathCombine(gameRoot(), "saves");
+}
+
+QString LegacyInstance::loaderModsDir() const
+{
+    return FS::PathCombine(gameRoot(), "mods");
+}
+
+QString LegacyInstance::coreModsDir() const
+{
+    return FS::PathCombine(gameRoot(), "coremods");
+}
+
+QString LegacyInstance::resourceDir() const
+{
+    return FS::PathCombine(gameRoot(), "resources");
+}
+QString LegacyInstance::texturePacksDir() const
+{
+    return FS::PathCombine(gameRoot(), "texturepacks");
+}
+
+QString LegacyInstance::runnableJar() const
+{
+    return FS::PathCombine(binRoot(), "minecraft.jar");
+}
+
+QString LegacyInstance::modListFile() const
+{
+    return FS::PathCombine(instanceRoot(), "modlist");
+}
+
+QString LegacyInstance::instanceConfigFolder() const
+{
+    return FS::PathCombine(gameRoot(), "config");
+}
+
+bool LegacyInstance::shouldRebuild() const
+{
+    return m_settings->get("NeedsRebuild").toBool();
+}
+
+QString LegacyInstance::currentVersionId() const
+{
+    return m_settings->get("JarVersion").toString();
+}
+
+QString LegacyInstance::intendedVersionId() const
+{
+    return m_settings->get("IntendedJarVersion").toString();
+}
+
+bool LegacyInstance::shouldUpdate() const
+{
+    QVariant var = settings()->get("ShouldUpdate");
+    if (!var.isValid() || var.toBool() == false)
+    {
+        return intendedVersionId() != currentVersionId();
+    }
+    return true;
+}
+
+QString LegacyInstance::defaultBaseJar() const
+{
+    return "versions/" + intendedVersionId() + "/" + intendedVersionId() + ".jar";
+}
+
+QString LegacyInstance::defaultCustomBaseJar() const
+{
+    return FS::PathCombine(binRoot(), "mcbackup.jar");
+}
+
+std::shared_ptr<WorldList> LegacyInstance::worldList() const
+{
+    if (!m_world_list)
+    {
+        m_world_list.reset(new WorldList(savesDir()));
+    }
+    return m_world_list;
+}
+
+QString LegacyInstance::typeName() const
+{
+    return tr("Legacy");
+}
+
+QString LegacyInstance::getStatusbarDescription()
+{
+    return tr("Instance from previous versions.");
+}
+
+QStringList LegacyInstance::verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin)
+{
+    QStringList out;
+
+    auto alltraits = traits();
+    if(alltraits.size())
+    {
+        out << "Traits:";
+        for (auto trait : alltraits)
+        {
+            out << "  " + trait;
+        }
+        out << "";
+    }
+
+    QString windowParams;
+    if (settings()->get("LaunchMaximized").toBool())
+    {
+        out << "Window size: max (if available)";
+    }
+    else
+    {
+        auto width = settings()->get("MinecraftWinWidth").toInt();
+        auto height = settings()->get("MinecraftWinHeight").toInt();
+        out << "Window size: " + QString::number(width) + " x " + QString::number(height);
+    }
+    out << "";
+    return out;
+}
diff --git a/launcher/minecraft/legacy/LegacyInstance.h b/launcher/minecraft/legacy/LegacyInstance.h
new file mode 100644
index 00000000..ac2a8543
--- /dev/null
+++ b/launcher/minecraft/legacy/LegacyInstance.h
@@ -0,0 +1,140 @@
+/* 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.
+ */
+
+#pragma once
+
+#include "BaseInstance.h"
+#include "launch/LaunchTask.h"
+
+class ModFolderModel;
+class LegacyModList;
+class WorldList;
+class Task;
+/*
+ * WHY: Legacy instances - from MultiMC 3 and 4 - are here only to provide a way to upgrade them to the current format.
+ */
+class LegacyInstance : public BaseInstance
+{
+    Q_OBJECT
+public:
+
+    explicit LegacyInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir);
+
+    virtual void saveNow() override {}
+
+    /// Path to the instance's minecraft.jar
+    QString runnableJar() const;
+
+    //! Path to the instance's modlist file.
+    QString modListFile() const;
+
+    ////// Directories //////
+    QString libDir() const;
+    QString savesDir() const;
+    QString texturePacksDir() const;
+    QString jarModsDir() const;
+    QString loaderModsDir() const;
+    QString coreModsDir() const;
+    QString resourceDir() const;
+    virtual QString instanceConfigFolder() const override;
+    QString gameRoot() const override; // Path to the instance's minecraft directory.
+    QString binRoot() const; // Path to the instance's minecraft bin directory.
+
+    /// Get the curent base jar of this instance. By default, it's the
+    /// versions/$version/$version.jar
+    QString baseJar() const;
+
+    /// the default base jar of this instance
+    QString defaultBaseJar() const;
+    /// the default custom base jar of this instance
+    QString defaultCustomBaseJar() const;
+
+    // the main jar that we actually want to keep when migrating the instance
+    QString mainJarToPreserve() const;
+
+    /*!
+     * Whether or not custom base jar is used
+     */
+    bool shouldUseCustomBaseJar() const;
+
+    /*!
+     * The value of the custom base jar
+     */
+    QString customBaseJar() const;
+
+    std::shared_ptr<LegacyModList> jarModList() const;
+    std::shared_ptr<WorldList> worldList() const;
+
+    /*!
+     * Whether or not the instance's minecraft.jar needs to be rebuilt.
+     * If this is true, when the instance launches, its jar mods will be
+     * re-added to a fresh minecraft.jar file.
+     */
+    bool shouldRebuild() const;
+
+    QString currentVersionId() const;
+    QString intendedVersionId() const;
+
+    QSet<QString> traits() const override
+    {
+        return {"legacy-instance", "texturepacks"};
+    };
+
+    virtual bool shouldUpdate() const;
+    virtual shared_qobject_ptr<Task> createUpdateTask(Net::Mode mode) override;
+
+    virtual QString typeName() const override;
+
+    bool canLaunch() const override
+    {
+        return false;
+    }
+    bool canEdit() const override
+    {
+        return true;
+    }
+    bool canExport() const override
+    {
+        return false;
+    }
+    shared_qobject_ptr<LaunchTask> createLaunchTask(
+            AuthSessionPtr account, MinecraftServerTargetPtr serverToJoin) override
+    {
+        return nullptr;
+    }
+    IPathMatcher::Ptr getLogFileMatcher() override
+    {
+        return nullptr;
+    }
+    QString getLogFileRoot() override
+    {
+        return gameRoot();
+    }
+
+    QString getStatusbarDescription() override;
+    QStringList verboseDescription(AuthSessionPtr session, MinecraftServerTargetPtr serverToJoin) override;
+
+    QProcessEnvironment createEnvironment() override
+    {
+        return QProcessEnvironment();
+    }
+    QMap<QString, QString> getVariables() const override
+    {
+        return {};
+    }
+protected:
+    mutable std::shared_ptr<LegacyModList> jar_mod_list;
+    mutable std::shared_ptr<WorldList> m_world_list;
+};
diff --git a/launcher/minecraft/legacy/LegacyModList.cpp b/launcher/minecraft/legacy/LegacyModList.cpp
new file mode 100644
index 00000000..7301eb8c
--- /dev/null
+++ b/launcher/minecraft/legacy/LegacyModList.cpp
@@ -0,0 +1,136 @@
+/* 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 "LegacyModList.h"
+#include <FileSystem.h>
+#include <QString>
+#include <QDebug>
+
+LegacyModList::LegacyModList(const QString &dir, const QString &list_file)
+    : m_dir(dir), m_list_file(list_file)
+{
+    FS::ensureFolderPathExists(m_dir.absolutePath());
+    m_dir.setFilter(QDir::Readable | QDir::NoDotAndDotDot | QDir::Files | QDir::Dirs | QDir::NoSymLinks);
+    m_dir.setSorting(QDir::Name | QDir::IgnoreCase | QDir::LocaleAware);
+}
+
+    struct OrderItem
+    {
+        QString id;
+        bool enabled = false;
+    };
+    typedef QList<OrderItem> OrderList;
+
+static void internalSort(QList<LegacyModList::Mod> &what)
+{
+    auto predicate = [](const LegacyModList::Mod &left, const LegacyModList::Mod &right)
+    {
+        return left.fileName().localeAwareCompare(right.fileName()) < 0;
+    };
+    std::sort(what.begin(), what.end(), predicate);
+}
+
+static OrderList readListFile(const QString &m_list_file)
+{
+    OrderList itemList;
+    if (m_list_file.isNull() || m_list_file.isEmpty())
+        return itemList;
+
+    QFile textFile(m_list_file);
+    if (!textFile.open(QIODevice::ReadOnly | QIODevice::Text))
+        return OrderList();
+
+    QTextStream textStream;
+    textStream.setAutoDetectUnicode(true);
+    textStream.setDevice(&textFile);
+    while (true)
+    {
+        QString line = textStream.readLine();
+        if (line.isNull() || line.isEmpty())
+            break;
+        else
+        {
+            OrderItem it;
+            it.enabled = !line.endsWith(".disabled");
+            if (!it.enabled)
+            {
+                line.chop(9);
+            }
+            it.id = line;
+            itemList.append(it);
+        }
+    }
+    textFile.close();
+    return itemList;
+}
+
+bool LegacyModList::update()
+{
+    if (!m_dir.exists() || !m_dir.isReadable())
+        return false;
+
+    QList<Mod> orderedMods;
+    QList<Mod> newMods;
+    m_dir.refresh();
+    auto folderContents = m_dir.entryInfoList();
+
+    // first, process the ordered items (if any)
+    OrderList listOrder = readListFile(m_list_file);
+    for (auto item : listOrder)
+    {
+        QFileInfo infoEnabled(m_dir.filePath(item.id));
+        QFileInfo infoDisabled(m_dir.filePath(item.id + ".disabled"));
+        int idxEnabled = folderContents.indexOf(infoEnabled);
+        int idxDisabled = folderContents.indexOf(infoDisabled);
+        bool isEnabled;
+        // if both enabled and disabled versions are present, it's a special case...
+        if (idxEnabled >= 0 && idxDisabled >= 0)
+        {
+            // we only process the one we actually have in the order file.
+            // and exactly as we have it.
+            // THIS IS A CORNER CASE
+            isEnabled = item.enabled;
+        }
+        else
+        {
+            // only one is present.
+            // we pick the one that we found.
+            // we assume the mod was enabled/disabled by external means
+            isEnabled = idxEnabled >= 0;
+        }
+        int idx = isEnabled ? idxEnabled : idxDisabled;
+        QFileInfo &info = isEnabled ? infoEnabled : infoDisabled;
+        // if the file from the index file exists
+        if (idx != -1)
+        {
+            // remove from the actual folder contents list
+            folderContents.takeAt(idx);
+            // append the new mod
+            orderedMods.append(info);
+        }
+    }
+    // if there are any untracked files... append them sorted at the end
+    if (folderContents.size())
+    {
+        for (auto entry : folderContents)
+        {
+            newMods.append(entry);
+        }
+        internalSort(newMods);
+        orderedMods.append(newMods);
+    }
+    mods.swap(orderedMods);
+    return true;
+}
diff --git a/launcher/minecraft/legacy/LegacyModList.h b/launcher/minecraft/legacy/LegacyModList.h
new file mode 100644
index 00000000..fade736e
--- /dev/null
+++ b/launcher/minecraft/legacy/LegacyModList.h
@@ -0,0 +1,47 @@
+/* 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.
+ */
+
+#pragma once
+
+#include <QList>
+#include <QString>
+#include <QDir>
+
+class LegacyModList
+{
+public:
+
+    using Mod = QFileInfo;
+
+    LegacyModList(const QString &dir, const QString &list_file = QString());
+
+    /// Reloads the mod list and returns true if the list changed.
+    bool update();
+
+    QDir dir()
+    {
+        return m_dir;
+    }
+
+    const QList<Mod> & allMods()
+    {
+        return mods;
+    }
+
+protected:
+    QDir m_dir;
+    QString m_list_file;
+    QList<Mod> mods;
+};
diff --git a/launcher/minecraft/legacy/LegacyUpgradeTask.cpp b/launcher/minecraft/legacy/LegacyUpgradeTask.cpp
new file mode 100644
index 00000000..a4ea60cd
--- /dev/null
+++ b/launcher/minecraft/legacy/LegacyUpgradeTask.cpp
@@ -0,0 +1,138 @@
+#include "LegacyUpgradeTask.h"
+#include "settings/INISettingsObject.h"
+#include "FileSystem.h"
+#include "NullInstance.h"
+#include "pathmatcher/RegexpMatcher.h"
+#include <QtConcurrentRun>
+#include "LegacyInstance.h"
+#include "minecraft/MinecraftInstance.h"
+#include "minecraft/PackProfile.h"
+#include "LegacyModList.h"
+#include "classparser.h"
+
+LegacyUpgradeTask::LegacyUpgradeTask(InstancePtr origInstance)
+{
+    m_origInstance = origInstance;
+}
+
+void LegacyUpgradeTask::executeTask()
+{
+    setStatus(tr("Copying instance %1").arg(m_origInstance->name()));
+
+    FS::copy folderCopy(m_origInstance->instanceRoot(), m_stagingPath);
+    folderCopy.followSymlinks(true);
+
+    m_copyFuture = QtConcurrent::run(QThreadPool::globalInstance(), folderCopy);
+    connect(&m_copyFutureWatcher, &QFutureWatcher<bool>::finished, this, &LegacyUpgradeTask::copyFinished);
+    connect(&m_copyFutureWatcher, &QFutureWatcher<bool>::canceled, this, &LegacyUpgradeTask::copyAborted);
+    m_copyFutureWatcher.setFuture(m_copyFuture);
+}
+
+static QString decideVersion(const QString& currentVersion, const QString& intendedVersion)
+{
+    if(intendedVersion != currentVersion)
+    {
+        if(!intendedVersion.isEmpty())
+        {
+            return intendedVersion;
+        }
+        else if(!currentVersion.isEmpty())
+        {
+            return currentVersion;
+        }
+    }
+    else
+    {
+        if(!intendedVersion.isEmpty())
+        {
+            return intendedVersion;
+        }
+    }
+    return QString();
+}
+
+void LegacyUpgradeTask::copyFinished()
+{
+    auto successful = m_copyFuture.result();
+    if(!successful)
+    {
+        emitFailed(tr("Instance folder copy failed."));
+        return;
+    }
+    auto legacyInst = std::dynamic_pointer_cast<LegacyInstance>(m_origInstance);
+
+    auto instanceSettings = std::make_shared<INISettingsObject>(FS::PathCombine(m_stagingPath, "instance.cfg"));
+    instanceSettings->registerSetting("InstanceType", "Legacy");
+    instanceSettings->set("InstanceType", "OneSix");
+    // NOTE: this scope ensures the instance is fully saved before we emitSucceeded
+    {
+        MinecraftInstance inst(m_globalSettings, instanceSettings, m_stagingPath);
+        inst.setName(m_instName);
+
+        QString preferredVersionNumber = decideVersion(legacyInst->currentVersionId(), legacyInst->intendedVersionId());
+        if(preferredVersionNumber.isNull())
+        {
+            // try to decide version based on the jar(s?)
+            preferredVersionNumber = classparser::GetMinecraftJarVersion(legacyInst->baseJar());
+            if(preferredVersionNumber.isNull())
+            {
+                preferredVersionNumber = classparser::GetMinecraftJarVersion(legacyInst->runnableJar());
+                if(preferredVersionNumber.isNull())
+                {
+                    emitFailed(tr("Could not decide Minecraft version."));
+                    return;
+                }
+            }
+        }
+        auto components = inst.getPackProfile();
+        components->buildingFromScratch();
+        components->setComponentVersion("net.minecraft", preferredVersionNumber, true);
+
+        QString jarPath = legacyInst->mainJarToPreserve();
+        if(!jarPath.isNull())
+        {
+            qDebug() << "Preserving base jar! : " << jarPath;
+            // FIXME: handle case when the jar is unreadable?
+            // TODO: check the hash, if it's the same as the upstream jar, do not do this
+            components->installCustomJar(jarPath);
+        }
+
+        auto jarMods = legacyInst->jarModList()->allMods();
+        for(auto & jarMod: jarMods)
+        {
+            QString modPath = jarMod.absoluteFilePath();
+            qDebug() << "jarMod: " << modPath;
+            components->installJarMods({modPath});
+        }
+
+        // remove all the extra garbage we no longer need
+        auto removeAll = [&](const QString &root, const QStringList &things)
+        {
+            for(auto &thing : things)
+            {
+                auto removePath = FS::PathCombine(root, thing);
+                QFileInfo stat(removePath);
+                if(stat.isDir())
+                {
+                    FS::deletePath(removePath);
+                }
+                else
+                {
+                    QFile::remove(removePath);
+                }
+            }
+        };
+        QStringList rootRemovables = {"modlist", "version", "instMods"};
+        QStringList mcRemovables = {"bin", "MultiMCLauncher.jar", "icon.png"};
+        removeAll(inst.instanceRoot(), rootRemovables);
+        removeAll(inst.gameRoot(), mcRemovables);
+    }
+    emitSucceeded();
+}
+
+void LegacyUpgradeTask::copyAborted()
+{
+    emitFailed(tr("Instance folder copy has been aborted."));
+    return;
+}
+
diff --git a/launcher/minecraft/legacy/LegacyUpgradeTask.h b/launcher/minecraft/legacy/LegacyUpgradeTask.h
new file mode 100644
index 00000000..542e17b8
--- /dev/null
+++ b/launcher/minecraft/legacy/LegacyUpgradeTask.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "InstanceTask.h"
+#include "net/NetJob.h"
+#include <QUrl>
+#include <QFuture>
+#include <QFutureWatcher>
+#include "settings/SettingsObject.h"
+#include "BaseVersion.h"
+#include "BaseInstance.h"
+
+
+class LegacyUpgradeTask : public InstanceTask
+{
+    Q_OBJECT
+public:
+    explicit LegacyUpgradeTask(InstancePtr origInstance);
+
+protected:
+    //! Entry point for tasks.
+    virtual void executeTask() override;
+    void copyFinished();
+    void copyAborted();
+
+private: /* data */
+    InstancePtr m_origInstance;
+    QFuture<bool> m_copyFuture;
+    QFutureWatcher<bool> m_copyFutureWatcher;
+};