Reider745
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107 lines
4.2 KiB
C++
Executable File
107 lines
4.2 KiB
C++
Executable File
// SPDX-License-Identifier: GPL-3.0-only
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/*
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* PolyMC - Minecraft Launcher
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* Copyright (C) 2022 Lenny McLennington <lenny@sneed.church>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "FetchFlameAPIKey.h"
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#include <BuildConfig.h>
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#include <Json.h>
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#include "Application.h"
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#include <ui/dialogs/CustomMessageBox.h>
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#include <ui/dialogs/ProgressDialog.h>
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FetchFlameAPIKey::FetchFlameAPIKey() : Task{} {}
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// Here, we fetch the official CurseForge API key from the files of the
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// CurseForge app. We range-request the specific ~84KiB zlib block inside the
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// AppImage's SquashFS that contains the API key and extract only that.
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// Note: We need a direct link to the AppImage for this to work. The download
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// link for the Linux app on CurseForge's website is to a zipped AppImage,
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// which will not work here since (I think?) ZIP files typically have one
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// non-chunked DEFLATE stream for each file, and there's no way to fetch a
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// single, independent chunk to extract.
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// See also https://git.sakamoto.pl/domi/curseme/src/commit/388ac991eb57dedd5d1aca45f418deb221d757d1/getToken.sh
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const QUrl CURSEFORGE_APP_URL{ "https://curseforge.overwolf.com/electron/linux/CurseForge-0.198.1-21.AppImage" };
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// Use https://github.com/unmojang/appimage-token-finder to find these offsets
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const uint32_t IN_ADDR{ 82926761 };
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const uint32_t IN_SIZE{ 84196 };
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const uint32_t OUT_SIZE{ 131072 };
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void FetchFlameAPIKey::executeTask()
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{
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QNetworkRequest req{ CURSEFORGE_APP_URL };
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// Request only a single zlib block from inside the AppImage file
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const auto& rangeHeader = QString("bytes=%1-%2").arg(IN_ADDR).arg(IN_ADDR + IN_SIZE);
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req.setRawHeader("Range", rangeHeader.toUtf8());
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m_reply.reset(APPLICATION->network()->get(req));
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connect(m_reply.get(), &QNetworkReply::downloadProgress, this, &Task::setProgress);
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connect(m_reply.get(), &QNetworkReply::finished, this, &FetchFlameAPIKey::downloadFinished);
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connect(m_reply.get(),
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#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
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&QNetworkReply::errorOccurred,
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#else
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qOverload<QNetworkReply::NetworkError>(&QNetworkReply::error),
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#endif
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this, [this](QNetworkReply::NetworkError error) {
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qCritical() << "Network error: " << error;
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emitFailed(m_reply->errorString());
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});
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setStatus(tr("Fetching Curseforge core API key (may take a few seconds)..."));
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}
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void FetchFlameAPIKey::downloadFinished()
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{
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auto res = m_reply->readAll();
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// Prepend expected size header. See https://doc.qt.io/qt-6/qbytearray.html#qUncompress-1
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QByteArray expectedSizeHeader;
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QDataStream expectedSizeHeaderStream{ &expectedSizeHeader, QIODevice::WriteOnly };
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expectedSizeHeaderStream.setByteOrder(QDataStream::BigEndian);
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expectedSizeHeaderStream << OUT_SIZE;
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res.prepend(expectedSizeHeader);
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const auto& block = qUncompress(res);
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if (block.isEmpty()) {
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emitFailed("Couldn't decompress Curseforge app data.");
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}
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const char* precedingString = "\"cfCoreApiKey\":\"";
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const QByteArray preceding{ precedingString };
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const auto& precedingIndex = block.indexOf(preceding);
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if (precedingIndex == -1) {
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emitFailed(QString("Couldn't find string '%1'.").arg(precedingString));
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}
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const auto& startIndex = precedingIndex + preceding.size();
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const auto& finalIndex = block.indexOf(QByteArray{ "\"" }, startIndex);
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if (finalIndex == -1) {
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emitFailed("Couldn't find closing \" for cfCoreApiKey value.");
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}
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const auto& keyByteArray = block.mid(startIndex, finalIndex - startIndex);
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m_result = QString{ keyByteArray };
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qDebug() << "Fetched Flame API key: " << m_result;
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emitSucceeded();
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}
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