Sneederix/sneedmc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Create offline mode accounts with consistent Uuids

Browse Source 
Uses basically what already exists in Qt, just modified so I can specify
an arbitrary length byte array for the namespace. Not really sure if it
needs to be the same as the way Minecraft generates it or if I could've
just used Uuid::createUuidV3. It would've still been consistent either
way, but whatever, this works.

Signed-off-by: Lenny McLennington <lenny@sneed.church>
This commit is contained in:
Lenny McLennington 2023-12-09 14:15:51 +00:00
parent 385eaea709
commit ff74d0d7ad
No known key found for this signature in database
GPG Key ID: F0467078ECA45FCB
1 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
launcher/minecraft/auth/MinecraftAccount.cpp
View File

@ -54,6 +54,36 @@
#include "flows/Offline.h"
#include "minecraft/auth/AccountData.h"
// Basically the same as https://github.com/qt/qtbase/blob/5.12/src/corelib/plugin/quuid.cpp#L152C1-L173C2, but unfortunately they don't allow
// us to specify a byte array for the namespace, we only get to specify a fixed length Uuid so I have to copy it and modify it ever so slightly.
static QUuid createUuidFromName(const QByteArray &ns, const QByteArray &baseData, QCryptographicHash::Algorithm algorithm, int version)
{
QByteArray hashResult;
// create a scope so later resize won't reallocate
{
QCryptographicHash hash(algorithm);
hash.addData(ns);
hash.addData(baseData);
hashResult = hash.result();
}
hashResult.resize(16); // Sha1 will be too long
QUuid result = QUuid::fromRfc4122(hashResult);
result.data3 &= 0x0FFF;
result.data3 |= (version << 12);
result.data4[0] &= 0x3F;
result.data4[0] |= 0x80;
return result;
}
static QUuid createUuidV3(const QByteArray &ns, const QByteArray &baseData)
{
return createUuidFromName(ns, baseData, QCryptographicHash::Md5, 3);
}
MinecraftAccount::MinecraftAccount(QObject* parent) : QObject(parent) {
data.internalId = QUuid::createUuid().toString().remove(QRegularExpression("[{}-]"));
}
@ -112,7 +142,7 @@ 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 = createUuidV3("OfflinePlayer:", username.toUtf8()).toString().remove(QRegularExpression("[{}-]"));
account->data.minecraftProfile.name = username;
account->data.minecraftProfile.validity = Katabasis::Validity::Certain;
return account;