pollymc/launcher/minecraft/PackProfile.cpp

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/* 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 <QFile>
#include <QCryptographicHash>
#include <Version.h>
#include <QDir>
#include <QJsonDocument>
#include <QJsonArray>
#include <QDebug>
#include <QSaveFile>
#include <QUuid>
#include <QTimer>
#include "Exception.h"
#include "minecraft/OneSixVersionFormat.h"
#include "FileSystem.h"
#include "meta/Index.h"
#include "minecraft/MinecraftInstance.h"
#include "Json.h"
#include "PackProfile.h"
#include "PackProfile_p.h"
#include "ComponentUpdateTask.h"
#include "Application.h"
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#include "modplatform/ModAPI.h"
static const QMap<QString, ModAPI::ModLoaderType> modloaderMapping{
{"net.minecraftforge", ModAPI::Forge},
{"net.fabricmc.fabric-loader", ModAPI::Fabric},
{"org.quiltmc.quilt-loader", ModAPI::Quilt}
};
PackProfile::PackProfile(MinecraftInstance * instance)
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: QAbstractListModel()
{
d.reset(new PackProfileData);
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d->m_instance = instance;
d->m_saveTimer.setSingleShot(true);
d->m_saveTimer.setInterval(5000);
d->interactionDisabled = instance->isRunning();
connect(d->m_instance, &BaseInstance::runningStatusChanged, this, &PackProfile::disableInteraction);
connect(&d->m_saveTimer, &QTimer::timeout, this, &PackProfile::save_internal);
}
PackProfile::~PackProfile()
{
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saveNow();
}
// BEGIN: component file format
static const int currentComponentsFileVersion = 1;
static QJsonObject componentToJsonV1(ComponentPtr component)
{
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QJsonObject obj;
// critical
obj.insert("uid", component->m_uid);
if(!component->m_version.isEmpty())
{
obj.insert("version", component->m_version);
}
if(component->m_dependencyOnly)
{
obj.insert("dependencyOnly", true);
}
if(component->m_important)
{
obj.insert("important", true);
}
if(component->m_disabled)
{
obj.insert("disabled", true);
}
// cached
if(!component->m_cachedVersion.isEmpty())
{
obj.insert("cachedVersion", component->m_cachedVersion);
}
if(!component->m_cachedName.isEmpty())
{
obj.insert("cachedName", component->m_cachedName);
}
Meta::serializeRequires(obj, &component->m_cachedRequires, "cachedRequires");
Meta::serializeRequires(obj, &component->m_cachedConflicts, "cachedConflicts");
if(component->m_cachedVolatile)
{
obj.insert("cachedVolatile", true);
}
return obj;
}
static ComponentPtr componentFromJsonV1(PackProfile * parent, const QString & componentJsonPattern, const QJsonObject &obj)
{
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// critical
auto uid = Json::requireString(obj.value("uid"));
auto filePath = componentJsonPattern.arg(uid);
auto component = new Component(parent, uid);
component->m_version = Json::ensureString(obj.value("version"));
component->m_dependencyOnly = Json::ensureBoolean(obj.value("dependencyOnly"), false);
component->m_important = Json::ensureBoolean(obj.value("important"), false);
// cached
// TODO @RESILIENCE: ignore invalid values/structure here?
component->m_cachedVersion = Json::ensureString(obj.value("cachedVersion"));
component->m_cachedName = Json::ensureString(obj.value("cachedName"));
Meta::parseRequires(obj, &component->m_cachedRequires, "cachedRequires");
Meta::parseRequires(obj, &component->m_cachedConflicts, "cachedConflicts");
component->m_cachedVolatile = Json::ensureBoolean(obj.value("volatile"), false);
bool disabled = Json::ensureBoolean(obj.value("disabled"), false);
component->setEnabled(!disabled);
return component;
}
// Save the given component container data to a file
static bool savePackProfile(const QString & filename, const ComponentContainer & container)
{
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QJsonObject obj;
obj.insert("formatVersion", currentComponentsFileVersion);
QJsonArray orderArray;
for(auto component: container)
{
orderArray.append(componentToJsonV1(component));
}
obj.insert("components", orderArray);
QSaveFile outFile(filename);
if (!outFile.open(QFile::WriteOnly))
{
qCritical() << "Couldn't open" << outFile.fileName()
<< "for writing:" << outFile.errorString();
return false;
}
auto data = QJsonDocument(obj).toJson(QJsonDocument::Indented);
if(outFile.write(data) != data.size())
{
qCritical() << "Couldn't write all the data into" << outFile.fileName()
<< "because:" << outFile.errorString();
return false;
}
if(!outFile.commit())
{
qCritical() << "Couldn't save" << outFile.fileName()
<< "because:" << outFile.errorString();
}
return true;
}
// Read the given file into component containers
static bool loadPackProfile(PackProfile * parent, const QString & filename, const QString & componentJsonPattern, ComponentContainer & container)
{
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QFile componentsFile(filename);
if (!componentsFile.exists())
{
qWarning() << "Components file doesn't exist. This should never happen.";
return false;
}
if (!componentsFile.open(QFile::ReadOnly))
{
qCritical() << "Couldn't open" << componentsFile.fileName()
<< " for reading:" << componentsFile.errorString();
qWarning() << "Ignoring overriden order";
return false;
}
// and it's valid JSON
QJsonParseError error;
QJsonDocument doc = QJsonDocument::fromJson(componentsFile.readAll(), &error);
if (error.error != QJsonParseError::NoError)
{
qCritical() << "Couldn't parse" << componentsFile.fileName() << ":" << error.errorString();
qWarning() << "Ignoring overriden order";
return false;
}
// and then read it and process it if all above is true.
try
{
auto obj = Json::requireObject(doc);
// check order file version.
auto version = Json::requireInteger(obj.value("formatVersion"));
if (version != currentComponentsFileVersion)
{
throw JSONValidationError(QObject::tr("Invalid component file version, expected %1")
.arg(currentComponentsFileVersion));
}
auto orderArray = Json::requireArray(obj.value("components"));
for(auto item: orderArray)
{
auto obj = Json::requireObject(item, "Component must be an object.");
container.append(componentFromJsonV1(parent, componentJsonPattern, obj));
}
}
catch (const JSONValidationError &err)
{
qCritical() << "Couldn't parse" << componentsFile.fileName() << ": bad file format";
container.clear();
return false;
}
return true;
}
// END: component file format
// BEGIN: save/load logic
void PackProfile::saveNow()
{
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if(saveIsScheduled())
{
d->m_saveTimer.stop();
save_internal();
}
}
bool PackProfile::saveIsScheduled() const
{
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return d->dirty;
}
void PackProfile::buildingFromScratch()
{
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d->loaded = true;
d->dirty = true;
}
void PackProfile::scheduleSave()
{
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if(!d->loaded)
{
qDebug() << "Component list should never save if it didn't successfully load, instance:" << d->m_instance->name();
return;
}
if(!d->dirty)
{
d->dirty = true;
qDebug() << "Component list save is scheduled for" << d->m_instance->name();
}
d->m_saveTimer.start();
}
QString PackProfile::componentsFilePath() const
{
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return FS::PathCombine(d->m_instance->instanceRoot(), "mmc-pack.json");
}
QString PackProfile::patchesPattern() const
{
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return FS::PathCombine(d->m_instance->instanceRoot(), "patches", "%1.json");
}
QString PackProfile::patchFilePathForUid(const QString& uid) const
{
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return patchesPattern().arg(uid);
}
void PackProfile::save_internal()
{
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qDebug() << "Component list save performed now for" << d->m_instance->name();
auto filename = componentsFilePath();
savePackProfile(filename, d->components);
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d->dirty = false;
}
bool PackProfile::load()
{
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auto filename = componentsFilePath();
// load the new component list and swap it with the current one...
ComponentContainer newComponents;
if(!loadPackProfile(this, filename, patchesPattern(), newComponents))
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{
qCritical() << "Failed to load the component config for instance" << d->m_instance->name();
return false;
}
else
{
// FIXME: actually use fine-grained updates, not this...
beginResetModel();
// disconnect all the old components
for(auto component: d->components)
{
disconnect(component.get(), &Component::dataChanged, this, &PackProfile::componentDataChanged);
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}
d->components.clear();
d->componentIndex.clear();
for(auto component: newComponents)
{
if(d->componentIndex.contains(component->m_uid))
{
qWarning() << "Ignoring duplicate component entry" << component->m_uid;
continue;
}
connect(component.get(), &Component::dataChanged, this, &PackProfile::componentDataChanged);
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d->components.append(component);
d->componentIndex[component->m_uid] = component;
}
endResetModel();
d->loaded = true;
return true;
}
}
void PackProfile::reload(Net::Mode netmode)
{
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// Do not reload when the update/resolve task is running. It is in control.
if(d->m_updateTask)
{
return;
}
// flush any scheduled saves to not lose state
saveNow();
// FIXME: differentiate when a reapply is required by propagating state from components
invalidateLaunchProfile();
if(load())
{
resolve(netmode);
}
}
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Task::Ptr PackProfile::getCurrentTask()
{
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return d->m_updateTask;
}
void PackProfile::resolve(Net::Mode netmode)
{
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auto updateTask = new ComponentUpdateTask(ComponentUpdateTask::Mode::Resolution, netmode, this);
d->m_updateTask.reset(updateTask);
connect(updateTask, &ComponentUpdateTask::succeeded, this, &PackProfile::updateSucceeded);
connect(updateTask, &ComponentUpdateTask::failed, this, &PackProfile::updateFailed);
connect(updateTask, &ComponentUpdateTask::aborted, this, [this]{ updateFailed(tr("Aborted")); });
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d->m_updateTask->start();
}
void PackProfile::updateSucceeded()
{
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qDebug() << "Component list update/resolve task succeeded for" << d->m_instance->name();
d->m_updateTask.reset();
invalidateLaunchProfile();
}
void PackProfile::updateFailed(const QString& error)
{
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qDebug() << "Component list update/resolve task failed for" << d->m_instance->name() << "Reason:" << error;
d->m_updateTask.reset();
invalidateLaunchProfile();
}
// END: save/load
void PackProfile::appendComponent(ComponentPtr component)
{
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insertComponent(d->components.size(), component);
}
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void PackProfile::insertComponent(size_t index, ComponentPtr component)
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{
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auto id = component->getID();
if(id.isEmpty())
{
qWarning() << "Attempt to add a component with empty ID!";
return;
}
if(d->componentIndex.contains(id))
{
qWarning() << "Attempt to add a component that is already present!";
return;
}
beginInsertRows(QModelIndex(), index, index);
d->components.insert(index, component);
d->componentIndex[id] = component;
endInsertRows();
connect(component.get(), &Component::dataChanged, this, &PackProfile::componentDataChanged);
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scheduleSave();
}
void PackProfile::componentDataChanged()
{
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auto objPtr = qobject_cast<Component *>(sender());
if(!objPtr)
{
qWarning() << "PackProfile got dataChenged signal from a non-Component!";
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return;
}
if(objPtr->getID() == "net.minecraft") {
emit minecraftChanged();
}
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// figure out which one is it... in a seriously dumb way.
int index = 0;
for (auto component: d->components)
{
if(component.get() == objPtr)
{
emit dataChanged(createIndex(index, 0), createIndex(index, columnCount(QModelIndex()) - 1));
scheduleSave();
return;
}
index++;
}
qWarning() << "PackProfile got dataChenged signal from a Component which does not belong to it!";
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}
bool PackProfile::remove(const int index)
{
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auto patch = getComponent(index);
if (!patch->isRemovable())
{
qWarning() << "Patch" << patch->getID() << "is non-removable";
return false;
}
if(!removeComponent_internal(patch))
{
qCritical() << "Patch" << patch->getID() << "could not be removed";
return false;
}
beginRemoveRows(QModelIndex(), index, index);
d->components.removeAt(index);
d->componentIndex.remove(patch->getID());
endRemoveRows();
invalidateLaunchProfile();
scheduleSave();
return true;
}
bool PackProfile::remove(const QString id)
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{
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int i = 0;
for (auto patch : d->components)
{
if (patch->getID() == id)
{
return remove(i);
}
i++;
}
return false;
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}
bool PackProfile::customize(int index)
{
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auto patch = getComponent(index);
if (!patch->isCustomizable())
{
qDebug() << "Patch" << patch->getID() << "is not customizable";
return false;
}
if(!patch->customize())
{
qCritical() << "Patch" << patch->getID() << "could not be customized";
return false;
}
invalidateLaunchProfile();
scheduleSave();
return true;
}
bool PackProfile::revertToBase(int index)
{
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auto patch = getComponent(index);
if (!patch->isRevertible())
{
qDebug() << "Patch" << patch->getID() << "is not revertible";
return false;
}
if(!patch->revert())
{
qCritical() << "Patch" << patch->getID() << "could not be reverted";
return false;
}
invalidateLaunchProfile();
scheduleSave();
return true;
}
Component * PackProfile::getComponent(const QString &id)
{
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auto iter = d->componentIndex.find(id);
if (iter == d->componentIndex.end())
{
return nullptr;
}
return (*iter).get();
}
Component * PackProfile::getComponent(int index)
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{
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if(index < 0 || index >= d->components.size())
{
return nullptr;
}
return d->components[index].get();
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}
QVariant PackProfile::data(const QModelIndex &index, int role) const
{
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if (!index.isValid())
return QVariant();
int row = index.row();
int column = index.column();
if (row < 0 || row >= d->components.size())
return QVariant();
auto patch = d->components.at(row);
switch (role)
{
case Qt::CheckStateRole:
{
switch (column)
{
case NameColumn: {
return patch->isEnabled() ? Qt::Checked : Qt::Unchecked;
}
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default:
return QVariant();
}
}
case Qt::DisplayRole:
{
switch (column)
{
case NameColumn:
return patch->getName();
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case VersionColumn:
{
if(patch->isCustom())
{
return QString("%1 (Custom)").arg(patch->getVersion());
}
else
{
return patch->getVersion();
}
}
default:
return QVariant();
}
}
case Qt::DecorationRole:
{
switch(column)
{
case NameColumn:
{
auto severity = patch->getProblemSeverity();
switch (severity)
{
case ProblemSeverity::Warning:
return "warning";
case ProblemSeverity::Error:
return "error";
default:
return QVariant();
}
}
default:
{
return QVariant();
}
}
}
}
return QVariant();
}
bool PackProfile::setData(const QModelIndex& index, const QVariant& value, int role)
{
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if (!index.isValid() || index.row() < 0 || index.row() >= rowCount(index))
{
return false;
}
if (role == Qt::CheckStateRole)
{
auto component = d->components[index.row()];
if (component->setEnabled(!component->isEnabled()))
{
return true;
}
}
return false;
}
QVariant PackProfile::headerData(int section, Qt::Orientation orientation, int role) const
{
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if (orientation == Qt::Horizontal)
{
if (role == Qt::DisplayRole)
{
switch (section)
{
case NameColumn:
return tr("Name");
case VersionColumn:
return tr("Version");
default:
return QVariant();
}
}
}
return QVariant();
}
// FIXME: zero precision mess
Qt::ItemFlags PackProfile::flags(const QModelIndex &index) const
{
if (!index.isValid()) {
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return Qt::NoItemFlags;
}
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Qt::ItemFlags outFlags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;
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int row = index.row();
if (row < 0 || row >= d->components.size()) {
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return Qt::NoItemFlags;
}
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auto patch = d->components.at(row);
// TODO: this will need fine-tuning later...
if(patch->canBeDisabled() && !d->interactionDisabled)
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{
outFlags |= Qt::ItemIsUserCheckable;
}
return outFlags;
}
int PackProfile::rowCount(const QModelIndex &parent) const
{
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return d->components.size();
}
int PackProfile::columnCount(const QModelIndex &parent) const
{
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return NUM_COLUMNS;
}
void PackProfile::move(const int index, const MoveDirection direction)
{
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int theirIndex;
if (direction == MoveUp)
{
theirIndex = index - 1;
}
else
{
theirIndex = index + 1;
}
if (index < 0 || index >= d->components.size())
return;
if (theirIndex >= rowCount())
theirIndex = rowCount() - 1;
if (theirIndex == -1)
theirIndex = rowCount() - 1;
if (index == theirIndex)
return;
int togap = theirIndex > index ? theirIndex + 1 : theirIndex;
auto from = getComponent(index);
auto to = getComponent(theirIndex);
if (!from || !to || !to->isMoveable() || !from->isMoveable())
{
return;
}
beginMoveRows(QModelIndex(), index, index, QModelIndex(), togap);
#if QT_VERSION >= QT_VERSION_CHECK(5, 13, 0)
d->components.swapItemsAt(index, theirIndex);
#else
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d->components.swap(index, theirIndex);
#endif
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endMoveRows();
invalidateLaunchProfile();
scheduleSave();
}
void PackProfile::invalidateLaunchProfile()
{
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d->m_profile.reset();
}
void PackProfile::installJarMods(QStringList selectedFiles)
{
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installJarMods_internal(selectedFiles);
}
void PackProfile::installCustomJar(QString selectedFile)
{
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installCustomJar_internal(selectedFile);
}
bool PackProfile::installEmpty(const QString& uid, const QString& name)
{
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QString patchDir = FS::PathCombine(d->m_instance->instanceRoot(), "patches");
if(!FS::ensureFolderPathExists(patchDir))
{
return false;
}
auto f = std::make_shared<VersionFile>();
f->name = name;
f->uid = uid;
f->version = "1";
QString patchFileName = FS::PathCombine(patchDir, uid + ".json");
QFile file(patchFileName);
if (!file.open(QFile::WriteOnly))
{
qCritical() << "Error opening" << file.fileName()
<< "for reading:" << file.errorString();
return false;
}
file.write(OneSixVersionFormat::versionFileToJson(f).toJson());
file.close();
appendComponent(new Component(this, f->uid, f));
scheduleSave();
invalidateLaunchProfile();
return true;
}
bool PackProfile::removeComponent_internal(ComponentPtr patch)
{
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bool ok = true;
// first, remove the patch file. this ensures it's not used anymore
auto fileName = patch->getFilename();
if(fileName.size())
{
QFile patchFile(fileName);
if(patchFile.exists() && !patchFile.remove())
{
qCritical() << "File" << fileName << "could not be removed because:" << patchFile.errorString();
return false;
}
}
// FIXME: we need a generic way of removing local resources, not just jar mods...
auto preRemoveJarMod = [&](LibraryPtr jarMod) -> bool
{
if (!jarMod->isLocal())
{
return true;
}
QStringList jar, temp1, temp2, temp3;
jarMod->getApplicableFiles(currentSystem, jar, temp1, temp2, temp3, d->m_instance->jarmodsPath().absolutePath());
QFileInfo finfo (jar[0]);
if(finfo.exists())
{
QFile jarModFile(jar[0]);
if(!jarModFile.remove())
{
qCritical() << "File" << jar[0] << "could not be removed because:" << jarModFile.errorString();
return false;
}
return true;
}
return true;
};
auto vFile = patch->getVersionFile();
if(vFile)
{
auto &jarMods = vFile->jarMods;
for(auto &jarmod: jarMods)
{
ok &= preRemoveJarMod(jarmod);
}
}
return ok;
}
bool PackProfile::installJarMods_internal(QStringList filepaths)
{
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QString patchDir = FS::PathCombine(d->m_instance->instanceRoot(), "patches");
if(!FS::ensureFolderPathExists(patchDir))
{
return false;
}
if (!FS::ensureFolderPathExists(d->m_instance->jarModsDir()))
{
return false;
}
for(auto filepath:filepaths)
{
QFileInfo sourceInfo(filepath);
auto uuid = QUuid::createUuid();
QString id = uuid.toString().remove('{').remove('}');
QString target_filename = id + ".jar";
QString target_id = "org.multimc.jarmod." + id;
QString target_name = sourceInfo.completeBaseName() + " (jar mod)";
QString finalPath = FS::PathCombine(d->m_instance->jarModsDir(), target_filename);
QFileInfo targetInfo(finalPath);
if(targetInfo.exists())
{
return false;
}
if (!QFile::copy(sourceInfo.absoluteFilePath(),QFileInfo(finalPath).absoluteFilePath()))
{
return false;
}
auto f = std::make_shared<VersionFile>();
auto jarMod = std::make_shared<Library>();
jarMod->setRawName(GradleSpecifier("org.multimc.jarmods:" + id + ":1"));
jarMod->setFilename(target_filename);
jarMod->setDisplayName(sourceInfo.completeBaseName());
jarMod->setHint("local");
f->jarMods.append(jarMod);
f->name = target_name;
f->uid = target_id;
QString patchFileName = FS::PathCombine(patchDir, target_id + ".json");
QFile file(patchFileName);
if (!file.open(QFile::WriteOnly))
{
qCritical() << "Error opening" << file.fileName()
<< "for reading:" << file.errorString();
return false;
}
file.write(OneSixVersionFormat::versionFileToJson(f).toJson());
file.close();
appendComponent(new Component(this, f->uid, f));
}
scheduleSave();
invalidateLaunchProfile();
return true;
}
bool PackProfile::installCustomJar_internal(QString filepath)
{
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QString patchDir = FS::PathCombine(d->m_instance->instanceRoot(), "patches");
if(!FS::ensureFolderPathExists(patchDir))
{
return false;
}
QString libDir = d->m_instance->getLocalLibraryPath();
if (!FS::ensureFolderPathExists(libDir))
{
return false;
}
auto specifier = GradleSpecifier("org.multimc:customjar:1");
QFileInfo sourceInfo(filepath);
QString target_filename = specifier.getFileName();
QString target_id = specifier.artifactId();
QString target_name = sourceInfo.completeBaseName() + " (custom jar)";
QString finalPath = FS::PathCombine(libDir, target_filename);
QFileInfo jarInfo(finalPath);
if (jarInfo.exists())
{
if(!QFile::remove(finalPath))
{
return false;
}
}
if (!QFile::copy(filepath, finalPath))
{
return false;
}
auto f = std::make_shared<VersionFile>();
auto jarMod = std::make_shared<Library>();
jarMod->setRawName(specifier);
jarMod->setDisplayName(sourceInfo.completeBaseName());
jarMod->setHint("local");
f->mainJar = jarMod;
f->name = target_name;
f->uid = target_id;
QString patchFileName = FS::PathCombine(patchDir, target_id + ".json");
QFile file(patchFileName);
if (!file.open(QFile::WriteOnly))
{
qCritical() << "Error opening" << file.fileName()
<< "for reading:" << file.errorString();
return false;
}
file.write(OneSixVersionFormat::versionFileToJson(f).toJson());
file.close();
appendComponent(new Component(this, f->uid, f));
scheduleSave();
invalidateLaunchProfile();
return true;
}
std::shared_ptr<LaunchProfile> PackProfile::getProfile() const
{
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if(!d->m_profile)
{
try
{
auto profile = std::make_shared<LaunchProfile>();
for(auto file: d->components)
{
qDebug() << "Applying" << file->getID() << (file->getProblemSeverity() == ProblemSeverity::Error ? "ERROR" : "GOOD");
file->applyTo(profile.get());
}
d->m_profile = profile;
}
catch (const Exception &error)
{
qWarning() << "Couldn't apply profile patches because: " << error.cause();
}
}
return d->m_profile;
}
bool PackProfile::setComponentVersion(const QString& uid, const QString& version, bool important)
{
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auto iter = d->componentIndex.find(uid);
if(iter != d->componentIndex.end())
{
ComponentPtr component = *iter;
// set existing
if(component->revert())
{
component->setVersion(version);
component->setImportant(important);
return true;
}
return false;
}
else
{
// add new
auto component = new Component(this, uid);
component->m_version = version;
component->m_important = important;
appendComponent(component);
return true;
}
}
QString PackProfile::getComponentVersion(const QString& uid) const
{
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const auto iter = d->componentIndex.find(uid);
if (iter != d->componentIndex.end())
{
return (*iter)->getVersion();
}
return QString();
}
void PackProfile::disableInteraction(bool disable)
{
if(d->interactionDisabled != disable) {
d->interactionDisabled = disable;
auto size = d->components.size();
if(size) {
emit dataChanged(index(0), index(size - 1));
}
}
}
ModAPI::ModLoaderTypes PackProfile::getModLoaders()
{
ModAPI::ModLoaderTypes result = ModAPI::Unspecified;
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QMapIterator<QString, ModAPI::ModLoaderType> i(modloaderMapping);
while (i.hasNext())
{
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i.next();
Component* c = getComponent(i.key());
if (c != nullptr && c->isEnabled()) {
result |= i.value();
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}
}
return result;
}