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fix: generate predictable UUIDs for offline accounts

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Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>
This commit is contained in:
Sefa Eyeoglu 2023-07-18 09:06:49 +02:00
parent 01afa8957f
commit f8fcb98c68
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GPG Key ID: E13DFD4B47127951
2 changed files with 33 additions and 1 deletions
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32
launcher/minecraft/auth/MinecraftAccount.cpp
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@ -37,6 +37,7 @@
#include "MinecraftAccount.h"
#include <QCryptographicHash>
#include <QUuid>
#include <QJsonObject>
#include <QJsonArray>
@ -100,7 +101,7 @@ MinecraftAccountPtr MinecraftAccount::createOffline(const QString &username)
account->data.yggdrasilToken.extra["clientToken"] = QUuid::createUuid().toString().remove(QRegularExpression("[{}-]"));
account->data.minecraftEntitlement.ownsMinecraft = true;
account->data.minecraftEntitlement.canPlayMinecraft = true;
account->data.minecraftProfile.id = QUuid::createUuid().toString().remove(QRegularExpression("[{}-]"));
account->data.minecraftProfile.id = uuidFromUsername(username).toString().remove(QRegularExpression("[{}-]"));
account->data.minecraftProfile.name = username;
account->data.minecraftProfile.validity = Katabasis::Validity::Certain;
return account;
@ -334,3 +335,32 @@ void MinecraftAccount::incrementUses()
qWarning() << "Profile" << data.profileId() << "is now in use.";
}
}
QUuid MinecraftAccount::uuidFromUsername(QString username) {
auto input = QString("OfflinePlayer:%1").arg(username).toUtf8();
// basically a reimplementation of Java's UUID#nameUUIDFromBytes
QByteArray digest = QCryptographicHash::hash(input, QCryptographicHash::Md5);
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
auto bOr = [](QByteArray& array, int index, char value) {
array[index] = array.at(index) | value;
};
auto bAnd = [](QByteArray& array, int index, char value) {
array[index] = array.at(index) & value;
};
#else
auto bOr = [](QByteArray& array, qsizetype index, char value) {
array[index] |= value;
};
auto bAnd = [](QByteArray& array, qsizetype index, char value) {
array[index] &= value;
};
#endif
bAnd(digest, 6, (char) 0x0f); // clear version
bOr(digest, 6, (char) 0x30); // set to version 3
bAnd(digest, 8, (char) 0x3f); // clear variant
bOr(digest, 8, (char) 0x80); // set to IETF variant
return QUuid::fromRfc4122(digest);
}

2
launcher/minecraft/auth/MinecraftAccount.h
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@ -98,6 +98,8 @@ public: /* construction */
static MinecraftAccountPtr loadFromJsonV2(const QJsonObject &json);
static MinecraftAccountPtr loadFromJsonV3(const QJsonObject &json);
static QUuid uuidFromUsername(QString username);
//! Saves a MinecraftAccount to a JSON object and returns it.
QJsonObject saveToJson() const;