GH-1795 add terminal launch option to use a specific Minecraft profile

Used like this:
```
./MultiMC --launch 1.17.1 --profile MultiMCTest --server mc.hypixel.net
```

launcher/CMakeLists.txt

@@ -565,6 +565,8 @@ SET(LAUNCHER_SOURCES
     Launcher.cpp
     UpdateController.cpp
     UpdateController.h
+    LauncherMessage.h
+    LauncherMessage.cpp
 
     # GUI - general utilities
     DesktopServices.h

launcher/LaunchController.cpp

@@ -34,9 +34,11 @@ void LaunchController::executeTask()
     login();
 }
 
-// FIXME: minecraft specific
+void LaunchController::decideAccount()
-void LaunchController::login() {
+{
-    JavaCommon::checkJVMArgs(m_instance->settings()->get("JvmArgs").toString(), m_parentWidget);
+    if(m_accountToUse) {
+        return;
+    }
 
     // Find an account to use.
     std::shared_ptr<AccountList> accounts = LAUNCHER->accounts();
@@ -60,8 +62,8 @@ void LaunchController::login() {
         }
     }
 
-    MinecraftAccountPtr account = accounts->activeAccount();
+    m_accountToUse = accounts->activeAccount();
-    if (account.get() == nullptr)
+    if (m_accountToUse == nullptr)
     {
         // If no default account is set, ask the user which one to use.
         ProfileSelectDialog selectDialog(
@@ -73,16 +75,23 @@ void LaunchController::login() {
         selectDialog.exec();
 
         // Launch the instance with the selected account.
-        account = selectDialog.selectedAccount();
+        m_accountToUse = selectDialog.selectedAccount();
 
         // If the user said to use the account as default, do that.
-        if (selectDialog.useAsGlobalDefault() && account.get() != nullptr) {
+        if (selectDialog.useAsGlobalDefault() && m_accountToUse) {
-            accounts->setActiveAccount(account->profileId());
+            accounts->setActiveAccount(m_accountToUse->profileId());
+        }
     }
 }
 
+
+void LaunchController::login() {
+    JavaCommon::checkJVMArgs(m_instance->settings()->get("JvmArgs").toString(), m_parentWidget);
+
+    decideAccount();
+
     // if no account is selected, we bail
-    if (!account.get())
+    if (!m_accountToUse)
     {
         emitFailed(tr("No account selected for launch."));
         return;
@@ -102,10 +111,10 @@ void LaunchController::login() {
         m_session->wants_online = m_online;
         std::shared_ptr<AccountTask> task;
         if(!password.isNull()) {
-            task = account->login(m_session, password);
+            task = m_accountToUse->login(m_session, password);
         }
         else {
-            task = account->refresh(m_session);
+            task = m_accountToUse->refresh(m_session);
         }
         if (task)
         {

launcher/LaunchController.h

@@ -4,6 +4,7 @@
 #include <tools/BaseProfiler.h>
 
 #include "minecraft/launch/MinecraftServerTarget.h"
+#include "minecraft/auth/MinecraftAccount.h"
 
 class InstanceWindow;
 class LaunchController: public Task
@@ -15,39 +16,45 @@ public:
     LaunchController(QObject * parent = nullptr);
     virtual ~LaunchController(){};
 
-    void setInstance(InstancePtr instance)
+    void setInstance(InstancePtr instance) {
-    {
         m_instance = instance;
     }
-    InstancePtr instance()
+
-    {
+    InstancePtr instance() {
         return m_instance;
     }
-    void setOnline(bool online)
+
-    {
+    void setOnline(bool online) {
         m_online = online;
     }
-    void setProfiler(BaseProfilerFactory *profiler)
+
-    {
+    void setProfiler(BaseProfilerFactory *profiler) {
         m_profiler = profiler;
     }
-    void setParentWidget(QWidget * widget)
+
-    {
+    void setParentWidget(QWidget * widget) {
         m_parentWidget = widget;
     }
-    void setServerToJoin(MinecraftServerTargetPtr serverToJoin)
+
-    {
+    void setServerToJoin(MinecraftServerTargetPtr serverToJoin) {
         m_serverToJoin = std::move(serverToJoin);
     }
+
+    void setAccountToUse(MinecraftAccountPtr accountToUse) {
+        m_accountToUse = std::move(accountToUse);
+    }
+
     QString id()
     {
         return m_instance->id();
     }
+
     bool abort() override;
 
 private:
     void login();
     void launchInstance();
+    void decideAccount();
 
 private slots:
     void readyForLaunch();
@@ -62,6 +69,7 @@ private:
     InstancePtr m_instance;
     QWidget * m_parentWidget = nullptr;
     InstanceWindow *m_console = nullptr;
+    MinecraftAccountPtr m_accountToUse = nullptr;
     AuthSessionPtr m_session;
     shared_qobject_ptr<LaunchTask> m_launcher;
     MinecraftServerTargetPtr m_serverToJoin;

launcher/Launcher.cpp

@@ -23,6 +23,8 @@
 #include "themes/BrightTheme.h"
 #include "themes/CustomTheme.h"
 
+#include "LauncherMessage.h"
+
 #include "setupwizard/SetupWizard.h"
 #include "setupwizard/LanguageWizardPage.h"
 #include "setupwizard/JavaWizardPage.h"
@@ -227,8 +229,7 @@ Launcher::Launcher(int &argc, char **argv) : QApplication(argc, argv)
         // --dir
         parser.addOption("dir");
         parser.addShortOpt("dir", 'd');
-        parser.addDocumentation("dir", "Use the supplied folder as application root instead of "
+        parser.addDocumentation("dir", "Use the supplied folder as application root instead of the binary location (use '.' for current)");
-                                       "the binary location (use '.' for current)");
         // --launch
         parser.addOption("launch");
         parser.addShortOpt("launch", 'l');
@@ -236,8 +237,11 @@ Launcher::Launcher(int &argc, char **argv) : QApplication(argc, argv)
         // --server
         parser.addOption("server");
         parser.addShortOpt("server", 's');
-        parser.addDocumentation("server", "Join the specified server on launch "
+        parser.addDocumentation("server", "Join the specified server on launch (only valid in combination with --launch)");
-                                          "(only valid in combination with --launch)");
+        // --profile
+        parser.addOption("profile");
+        parser.addShortOpt("profile", 'a');
+        parser.addDocumentation("profile", "Use the account specified by its profile name (only valid in combination with --launch)");
         // --alive
         parser.addSwitch("alive");
         parser.addDocumentation("alive", "Write a small '" + liveCheckFile + "' file after the launcher starts");
@@ -280,6 +284,7 @@ Launcher::Launcher(int &argc, char **argv) : QApplication(argc, argv)
     }
     m_instanceIdToLaunch = args["launch"].toString();
     m_serverToJoin = args["server"].toString();
+    m_profileToUse = args["profile"].toString();
     m_liveCheck = args["alive"].toBool();
     m_zipToImport = args["import"].toUrl();
 
@@ -346,6 +351,13 @@ Launcher::Launcher(int &argc, char **argv) : QApplication(argc, argv)
         return;
     }
 
+    if(m_instanceIdToLaunch.isEmpty() && !m_profileToUse.isEmpty())
+    {
+        std::cerr << "--account can only be used in combination with --launch!" << std::endl;
+        m_status = Launcher::Failed;
+        return;
+    }
+
 #if defined(Q_OS_MAC)
     // move user data to new location if on macOS and it still exists in Contents/MacOS
     QDir fi(applicationDirPath());
@@ -419,30 +431,38 @@ Launcher::Launcher(int &argc, char **argv) : QApplication(argc, argv)
         // FIXME: you can run the same binaries with multiple data dirs and they won't clash. This could cause issues for updates.
         m_peerInstance = new LocalPeer(this, appID);
         connect(m_peerInstance, &LocalPeer::messageReceived, this, &Launcher::messageReceived);
-        if(m_peerInstance->isClient())
+        if(m_peerInstance->isClient()) {
-        {
             int timeout = 2000;
 
             if(m_instanceIdToLaunch.isEmpty())
             {
-                m_peerInstance->sendMessage("activate", timeout);
+                LauncherMessage activate;
+                activate.command = "activate";
+                m_peerInstance->sendMessage(activate.serialize(), timeout);
 
                 if(!m_zipToImport.isEmpty())
                 {
-                    m_peerInstance->sendMessage("import " + m_zipToImport.toString(), timeout);
+                    LauncherMessage import;
+                    import.command = "import";
+                    import.args.insert("path", m_zipToImport.toString());
+                    m_peerInstance->sendMessage(import.serialize(), timeout);
                 }
             }
             else
             {
+                LauncherMessage launch;
+                launch.command = "launch";
+                launch.args["id"] = m_instanceIdToLaunch;
+
                 if(!m_serverToJoin.isEmpty())
                 {
-                    m_peerInstance->sendMessage(
+                    launch.args["server"] = m_serverToJoin;
-                            "launch-with-server " + m_instanceIdToLaunch + " " + m_serverToJoin, timeout);
                 }
-                else
+                if(!m_profileToUse.isEmpty())
                 {
-                    m_peerInstance->sendMessage("launch " + m_instanceIdToLaunch, timeout);
+                    launch.args["profile"] = m_profileToUse;
                 }
+                m_peerInstance->sendMessage(launch.serialize(), timeout);
             }
             m_status = Launcher::Succeeded;
             return;
@@ -977,18 +997,26 @@ void Launcher::performMainStartupAction()
         if(inst)
         {
             MinecraftServerTargetPtr serverToJoin = nullptr;
+            MinecraftAccountPtr accountToUse = nullptr;
 
+            qDebug() << "<> Instance" << m_instanceIdToLaunch << "launching";
             if(!m_serverToJoin.isEmpty())
             {
+                // FIXME: validate the server string
                 serverToJoin.reset(new MinecraftServerTarget(MinecraftServerTarget::parse(m_serverToJoin)));
-                qDebug() << "<> Instance" << m_instanceIdToLaunch << "launching with server" << m_serverToJoin;
+                qDebug() << "   Launching with server" << m_serverToJoin;
-            }
-            else
-            {
-                qDebug() << "<> Instance" << m_instanceIdToLaunch << "launching";
             }
 
-            launch(inst, true, nullptr, serverToJoin);
+            if(!m_profileToUse.isEmpty())
+            {
+                accountToUse = accounts()->getAccountByProfileName(m_profileToUse);
+                if(!accountToUse) {
+                    return;
+                }
+                qDebug() << "   Launching with account" << m_profileToUse;
+            }
+
+            launch(inst, true, nullptr, serverToJoin, accountToUse);
             return;
         }
     }
@@ -1032,7 +1060,7 @@ Launcher::~Launcher()
 #endif
 }
 
-void Launcher::messageReceived(const QString& message)
+void Launcher::messageReceived(const QByteArray& message)
 {
     if(status() != Initialized)
     {
@@ -1040,7 +1068,10 @@ void Launcher::messageReceived(const QString& message)
         return;
     }
 
-    QString command = message.section(' ', 0, 0);
+    LauncherMessage received;
+    received.parse(message);
+
+    auto & command = received.command;
 
     if(command == "activate")
     {
@@ -1048,53 +1079,55 @@ void Launcher::messageReceived(const QString& message)
     }
     else if(command == "import")
     {
-        QString arg = message.section(' ', 1);
+        QString path = received.args["path"];
-        if(arg.isEmpty())
+        if(path.isEmpty())
         {
             qWarning() << "Received" << command << "message without a zip path/URL.";
             return;
         }
-        m_mainWindow->droppedURLs({ QUrl(arg) });
+        m_mainWindow->droppedURLs({ QUrl(path) });
     }
     else if(command == "launch")
     {
-        QString arg = message.section(' ', 1);
+        QString id = received.args["id"];
-        if(arg.isEmpty())
+        QString server = received.args["server"];
-        {
+        QString profile = received.args["profile"];
-            qWarning() << "Received" << command << "message without an instance ID.";
+
+        InstancePtr instance;
+        if(!id.isEmpty()) {
+            instance = instances()->getInstanceById(id);
+            if(!instance) {
+                qWarning() << "Launch command requires an valid instance ID. " << id << "resolves to nothing.";
                 return;
             }
-        auto inst = instances()->getInstanceById(arg);
-        if(inst)
-        {
-            launch(inst, true, nullptr);
         }
-    }
+        else {
-    else if(command == "launch-with-server")
+            qWarning() << "Launch command called without an instance ID...";
-    {
-        QString instanceID = message.section(' ', 1, 1);
-        QString serverToJoin = message.section(' ', 2, 2);
-        if(instanceID.isEmpty())
-        {
-            qWarning() << "Received" << command << "message without an instance ID.";
             return;
         }
-        if(serverToJoin.isEmpty())
+
-        {
+        MinecraftServerTargetPtr serverObject = nullptr;
-            qWarning() << "Received" << command << "message without a server to join.";
+        if(!server.isEmpty()) {
+            serverObject = std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(server));
+        }
+
+        MinecraftAccountPtr accountObject;
+        if(!profile.isEmpty()) {
+            accountObject = accounts()->getAccountByProfileName(profile);
+            if(!accountObject) {
+                qWarning() << "Launch command requires the specified profile to be valid. " << profile << "does not resolve to any account.";
                 return;
             }
-        auto inst = instances()->getInstanceById(instanceID);
+        }
-        if(inst)
+
-        {
         launch(
-                    inst,
+            instance,
             true,
             nullptr,
-                    std::make_shared<MinecraftServerTarget>(MinecraftServerTarget::parse(serverToJoin))
+            serverObject,
+            accountObject
         );
     }
-    }
     else
     {
         qWarning() << "Received invalid message" << message;
@@ -1189,7 +1222,8 @@ bool Launcher::launch(
         InstancePtr instance,
         bool online,
         BaseProfilerFactory *profiler,
-        MinecraftServerTargetPtr serverToJoin
+        MinecraftServerTargetPtr serverToJoin,
+        MinecraftAccountPtr accountToUse
 ) {
     if(m_updateRunning)
     {
@@ -1212,6 +1246,7 @@ bool Launcher::launch(
         controller->setOnline(online);
         controller->setProfiler(profiler);
         controller->setServerToJoin(serverToJoin);
+        controller->setAccountToUse(accountToUse);
         if(window)
         {
             controller->setParentWidget(window);

launcher/Launcher.h

@@ -156,13 +156,14 @@ public slots:
             InstancePtr instance,
             bool online = true,
             BaseProfilerFactory *profiler = nullptr,
-            MinecraftServerTargetPtr serverToJoin = nullptr
+            MinecraftServerTargetPtr serverToJoin = nullptr,
+            MinecraftAccountPtr accountToUse = nullptr
     );
     bool kill(InstancePtr instance);
 
 private slots:
     void on_windowClose();
-    void messageReceived(const QString & message);
+    void messageReceived(const QByteArray & message);
     void controllerSucceeded();
     void controllerFailed(const QString & error);
     void analyticsSettingChanged(const Setting &setting, QVariant value);
@@ -229,6 +230,7 @@ private:
 public:
     QString m_instanceIdToLaunch;
     QString m_serverToJoin;
+    QString m_profileToUse;
     bool m_liveCheck = false;
     QUrl m_zipToImport;
     std::unique_ptr<QFile> logFile;

launcher/LauncherMessage.cpp

@@ -0,0 +1,31 @@
+#include "LauncherMessage.h"
+
+#include <QJsonDocument>
+#include <QJsonObject>
+
+void LauncherMessage::parse(const QByteArray & input) {
+    auto doc = QJsonDocument::fromBinaryData(input);
+    auto root = doc.object();
+
+    command = root.value("command").toString();
+    args.clear();
+
+    auto parsedArgs = root.value("args").toObject();
+    for(auto iter = parsedArgs.begin(); iter != parsedArgs.end(); iter++) {
+        args[iter.key()] = iter.value().toString();
+    }
+}
+
+QByteArray LauncherMessage::serialize() {
+    QJsonObject root;
+    root.insert("command", command);
+    QJsonObject outArgs;
+    for (auto iter = args.begin(); iter != args.end(); iter++) {
+        outArgs[iter.key()] = iter.value();
+    }
+    root.insert("args", outArgs);
+
+    QJsonDocument out;
+    out.setObject(root);
+    return out.toBinaryData();
+}

launcher/LauncherMessage.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <QString>
+#include <QMap>
+#include <QByteArray>
+
+struct LauncherMessage {
+    QString command;
+    QMap<QString, QString> args;
+
+    QByteArray serialize();
+    void parse(const QByteArray & input);
+};

launcher/minecraft/auth/AccountList.cpp

@@ -47,6 +47,16 @@ int AccountList::findAccountByProfileId(const QString& profileId) const {
     return -1;
 }
 
+MinecraftAccountPtr AccountList::getAccountByProfileName(const QString& profileName) const {
+    for (int i = 0; i < count(); i++) {
+        MinecraftAccountPtr account = at(i);
+        if (account->profileName() == profileName) {
+            return account;
+        }
+    }
+    return nullptr;
+}
+
 const MinecraftAccountPtr AccountList::at(int i) const
 {
     return MinecraftAccountPtr(m_accounts.at(i));

launcher/minecraft/auth/AccountList.h

@@ -62,6 +62,7 @@ public:
     void addAccount(const MinecraftAccountPtr account);
     void removeAccount(QModelIndex index);
     int findAccountByProfileId(const QString &profileId) const;
+    MinecraftAccountPtr getAccountByProfileName(const QString &profileName) const;
 
     /*!
      * Sets the path to load/save the list file from/to.

launcher/minecraft/launch/MinecraftServerTarget.cpp

@@ -17,6 +17,7 @@
 
 #include <QStringList>
 
+// FIXME: the way this is written, it can't ever do any sort of validation and can accept total junk
 MinecraftServerTarget MinecraftServerTarget::parse(const QString &fullAddress) {
     QStringList split = fullAddress.split(":");
 

libraries/LocalPeer/include/LocalPeer.h

@@ -83,11 +83,11 @@ public:
     LocalPeer(QObject *parent, const ApplicationId &appId);
     ~LocalPeer();
     bool isClient();
-    bool sendMessage(const QString &message, int timeout);
+    bool sendMessage(const QByteArray &message, int timeout);
     ApplicationId applicationId() const;
 
 Q_SIGNALS:
-    void messageReceived(const QString &message);
+    void messageReceived(const QByteArray &message);
 
 protected Q_SLOTS:
     void receiveConnection();

libraries/LocalPeer/src/LocalPeer.cpp

@@ -155,7 +155,7 @@ bool LocalPeer::isClient()
 }
 
 
-bool LocalPeer::sendMessage(const QString &message, int timeout)
+bool LocalPeer::sendMessage(const QByteArray &message, int timeout)
 {
     if (!isClient())
         return false;
@@ -177,7 +177,7 @@ bool LocalPeer::sendMessage(const QString &message, int timeout)
         return false;
     }
 
-    QByteArray uMsg(message.toUtf8());
+    QByteArray uMsg(message);
     QDataStream ds(&socket);
 
     ds.writeBytes(uMsg.constData(), uMsg.size());
@@ -232,10 +232,9 @@ void LocalPeer::receiveConnection()
         delete socket;
         return;
     }
-    QString message(QString::fromUtf8(uMsg));
     socket->write(ack, qstrlen(ack));
     socket->waitForBytesWritten(1000);
     socket->waitForDisconnected(1000); // make sure client reads ack
     delete socket;
-    emit messageReceived(message); //### (might take a long time to return)
+    emit messageReceived(uMsg); //### (might take a long time to return)
 }