mirror of
https://github.com/MultiMC/MultiMC5.git
synced 2024-12-29 09:15:49 +00:00
428 lines
12 KiB
C++
428 lines
12 KiB
C++
#include "PackageManifest.h"
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#include <Json.h>
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#include <QDir>
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#include <QDirIterator>
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#include <QCryptographicHash>
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#include <QDebug>
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#ifndef Q_OS_WIN32
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#endif
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namespace mojang_files {
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const Hash hash_of_empty_string = "da39a3ee5e6b4b0d3255bfef95601890afd80709";
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int Path::compare(const Path& rhs) const
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{
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auto left_cursor = begin();
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auto left_end = end();
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auto right_cursor = rhs.begin();
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auto right_end = rhs.end();
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while (left_cursor != left_end && right_cursor != right_end)
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{
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if(*left_cursor < *right_cursor)
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{
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return -1;
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}
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else if(*left_cursor > *right_cursor)
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{
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return 1;
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}
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left_cursor++;
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right_cursor++;
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}
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if(left_cursor == left_end)
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{
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if(right_cursor == right_end)
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{
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return 0;
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}
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return -1;
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}
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return 1;
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}
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void Package::addFile(const Path& path, const File& file) {
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addFolder(path.parent_path());
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files[path] = file;
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}
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void Package::addFolder(Path folder) {
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if(!folder.has_parent_path()) {
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return;
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}
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do {
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folders.insert(folder);
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folder = folder.parent_path();
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} while(folder.has_parent_path());
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}
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void Package::addLink(const Path& path, const Path& target) {
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addFolder(path.parent_path());
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symlinks[path] = target;
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}
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void Package::addSource(const FileSource& source) {
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sources[source.hash] = source;
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}
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namespace {
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void fromJson(QJsonDocument & doc, Package & out) {
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std::set<Path> seen_paths;
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if (!doc.isObject())
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{
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throw JSONValidationError("file manifest is not an object");
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}
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QJsonObject root = doc.object();
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auto filesObj = Json::ensureObject(root, "files");
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auto iter = filesObj.begin();
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while (iter != filesObj.end())
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{
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Path objectPath = Path(iter.key());
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auto value = iter.value();
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iter++;
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if(seen_paths.count(objectPath)) {
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throw JSONValidationError("duplicate path inside manifest, the manifest is invalid");
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}
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if (!value.isObject())
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{
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throw JSONValidationError("file entry inside manifest is not an an object");
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}
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seen_paths.insert(objectPath);
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auto fileObject = value.toObject();
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auto type = Json::requireString(fileObject, "type");
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if(type == "directory") {
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out.addFolder(objectPath);
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continue;
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}
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else if(type == "file") {
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FileSource bestSource;
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File file;
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file.executable = Json::ensureBoolean(fileObject, QString("executable"), false);
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auto downloads = Json::requireObject(fileObject, "downloads");
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for(auto iter2 = downloads.begin(); iter2 != downloads.end(); iter2++) {
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FileSource source;
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auto downloadObject = Json::requireObject(iter2.value());
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source.hash = Json::requireString(downloadObject, "sha1");
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source.size = Json::requireInteger(downloadObject, "size");
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source.url = Json::requireString(downloadObject, "url");
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auto compression = iter2.key();
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if(compression == "raw") {
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file.hash = source.hash;
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file.size = source.size;
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source.compression = Compression::Raw;
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}
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else if (compression == "lzma") {
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source.compression = Compression::Lzma;
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}
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else {
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continue;
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}
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bestSource.upgrade(source);
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}
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if(bestSource.isBad()) {
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throw JSONValidationError("No valid compression method for file " + iter.key());
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}
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out.addFile(objectPath, file);
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out.addSource(bestSource);
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}
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else if(type == "link") {
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auto target = Json::requireString(fileObject, "target");
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out.symlinks[objectPath] = target;
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out.addLink(objectPath, target);
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}
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else {
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throw JSONValidationError("Invalid item type in manifest: " + type);
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}
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}
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// make sure the containing folder exists
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out.folders.insert(Path());
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}
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}
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Package Package::fromManifestContents(const QByteArray& contents)
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{
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Package out;
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try
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{
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auto doc = Json::requireDocument(contents, "Manifest");
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fromJson(doc, out);
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return out;
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}
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catch (const Exception &e)
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{
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qDebug() << QString("Unable to parse manifest: %1").arg(e.cause());
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out.valid = false;
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return out;
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}
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}
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Package Package::fromManifestFile(const QString & filename) {
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Package out;
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try
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{
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auto doc = Json::requireDocument(filename, filename);
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fromJson(doc, out);
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return out;
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}
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catch (const Exception &e)
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{
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qDebug() << QString("Unable to parse manifest file %1: %2").arg(filename, e.cause());
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out.valid = false;
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return out;
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}
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}
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#ifndef Q_OS_WIN32
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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namespace {
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// FIXME: Qt obscures symlink targets by making them absolute. that is useless. this is the workaround - we do it ourselves
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bool actually_read_symlink_target(const QString & filepath, Path & out)
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{
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struct ::stat st;
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// FIXME: here, we assume the native filesystem encoding. May the Gods have mercy upon our Souls.
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QByteArray nativePath = filepath.toUtf8();
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const char * filepath_cstr = nativePath.data();
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if (lstat(filepath_cstr, &st) != 0)
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{
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return false;
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}
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auto size = st.st_size ? st.st_size + 1 : PATH_MAX;
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std::string temp(size, '\0');
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// because we don't realiably know how long the damn thing actually is, we loop and expand. POSIX is naff
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do
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{
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auto link_length = ::readlink(filepath_cstr, &temp[0], temp.size());
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if(link_length == -1)
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{
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return false;
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}
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if(std::string::size_type(link_length) < temp.size())
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{
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// buffer was long enough and we managed to read the link target. RETURN here.
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temp.resize(link_length);
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out = Path(QString::fromUtf8(temp.c_str()));
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return true;
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}
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temp.resize(temp.size() * 2);
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} while (true);
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}
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}
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#endif
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// FIXME: Qt filesystem abstraction is bad, but ... let's hope it doesn't break too much?
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// FIXME: The error handling is just DEFICIENT
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Package Package::fromInspectedFolder(const QString& folderPath)
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{
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QDir root(folderPath);
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Package out;
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QDirIterator iterator(folderPath, QDir::NoDotAndDotDot | QDir::AllEntries | QDir::System | QDir::Hidden, QDirIterator::Subdirectories);
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while(iterator.hasNext()) {
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iterator.next();
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auto fileInfo = iterator.fileInfo();
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auto relPath = root.relativeFilePath(fileInfo.filePath());
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// FIXME: this is probably completely busted on Windows anyway, so just disable it.
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// Qt makes shit up and doesn't understand the platform details
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// TODO: Actually use a filesystem library that isn't terrible and has decen license.
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// I only know one, and I wrote it. Sadly, currently proprietary. PAIN.
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#ifndef Q_OS_WIN32
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if(fileInfo.isSymLink()) {
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Path targetPath;
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if(!actually_read_symlink_target(fileInfo.filePath(), targetPath)) {
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qCritical() << "Folder inspection: Unknown filesystem object:" << fileInfo.absoluteFilePath();
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out.valid = false;
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}
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out.addLink(relPath, targetPath);
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}
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else
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#endif
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if(fileInfo.isDir()) {
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out.addFolder(relPath);
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}
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else if(fileInfo.isFile()) {
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File f;
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f.executable = fileInfo.isExecutable();
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f.size = fileInfo.size();
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// FIXME: async / optimize the hashing
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QFile input(fileInfo.absoluteFilePath());
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if(!input.open(QIODevice::ReadOnly)) {
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qCritical() << "Folder inspection: Failed to open file:" << fileInfo.absoluteFilePath();
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out.valid = false;
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break;
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}
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f.hash = QCryptographicHash::hash(input.readAll(), QCryptographicHash::Sha1).toHex().constData();
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out.addFile(relPath, f);
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}
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else {
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// Something else... oh my
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qCritical() << "Folder inspection: Unknown filesystem object:" << fileInfo.absoluteFilePath();
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out.valid = false;
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break;
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}
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}
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out.folders.insert(Path("."));
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out.valid = true;
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return out;
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}
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namespace {
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struct shallow_first_sort
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{
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bool operator()(const Path &lhs, const Path &rhs) const
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{
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auto lhs_depth = lhs.length();
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auto rhs_depth = rhs.length();
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if(lhs_depth < rhs_depth)
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{
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return true;
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}
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else if(lhs_depth == rhs_depth)
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{
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if(lhs < rhs)
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{
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return true;
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}
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}
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return false;
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}
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};
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struct deep_first_sort
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{
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bool operator()(const Path &lhs, const Path &rhs) const
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{
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auto lhs_depth = lhs.length();
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auto rhs_depth = rhs.length();
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if(lhs_depth > rhs_depth)
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{
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return true;
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}
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else if(lhs_depth == rhs_depth)
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{
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if(lhs < rhs)
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{
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return true;
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}
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}
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return false;
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}
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};
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}
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UpdateOperations UpdateOperations::resolve(const Package& from, const Package& to)
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{
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UpdateOperations out;
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if(!from.valid || !to.valid) {
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out.valid = false;
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return out;
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}
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// Files
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for(auto iter = from.files.begin(); iter != from.files.end(); iter++) {
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const auto ¤t_hash = iter->second.hash;
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const auto ¤t_executable = iter->second.executable;
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const auto &path = iter->first;
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auto iter2 = to.files.find(path);
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if(iter2 == to.files.end()) {
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// removed
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out.deletes.push_back(path);
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continue;
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}
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auto new_hash = iter2->second.hash;
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auto new_executable = iter2->second.executable;
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if (current_hash != new_hash) {
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out.deletes.push_back(path);
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out.downloads.emplace(
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std::pair<Path, FileDownload>{
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path,
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FileDownload(to.sources.at(iter2->second.hash), iter2->second.executable)
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}
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);
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}
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else if (current_executable != new_executable) {
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out.executable_fixes[path] = new_executable;
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}
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}
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for(auto iter = to.files.begin(); iter != to.files.end(); iter++) {
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auto path = iter->first;
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if(!from.files.count(path)) {
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out.downloads.emplace(
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std::pair<Path, FileDownload>{
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path,
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FileDownload(to.sources.at(iter->second.hash), iter->second.executable)
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}
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);
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}
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}
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// Folders
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std::set<Path, deep_first_sort> remove_folders;
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std::set<Path, shallow_first_sort> make_folders;
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for(auto from_path: from.folders) {
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auto iter = to.folders.find(from_path);
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if(iter == to.folders.end()) {
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remove_folders.insert(from_path);
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}
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}
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for(auto & rmdir: remove_folders) {
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out.rmdirs.push_back(rmdir);
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}
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for(auto to_path: to.folders) {
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auto iter = from.folders.find(to_path);
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if(iter == from.folders.end()) {
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make_folders.insert(to_path);
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}
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}
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for(auto & mkdir: make_folders) {
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out.mkdirs.push_back(mkdir);
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}
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// Symlinks
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for(auto iter = from.symlinks.begin(); iter != from.symlinks.end(); iter++) {
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const auto ¤t_target = iter->second;
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const auto &path = iter->first;
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auto iter2 = to.symlinks.find(path);
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if(iter2 == to.symlinks.end()) {
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// removed
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out.deletes.push_back(path);
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continue;
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}
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const auto &new_target = iter2->second;
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if (current_target != new_target) {
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out.deletes.push_back(path);
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out.mklinks[path] = iter2->second;
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}
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}
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for(auto iter = to.symlinks.begin(); iter != to.symlinks.end(); iter++) {
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auto path = iter->first;
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if(!from.symlinks.count(path)) {
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out.mklinks[path] = iter->second;
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}
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}
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out.valid = true;
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return out;
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}
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}
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