Add CMake option to enable stricter DRM

CMakeLists.txt

@@ -138,6 +138,8 @@ set(Launcher_MSA_CLIENT_ID "6b329578-bfec-42a3-b503-303ab3f2ac96" CACHE STRING "
 set(Launcher_CURSEFORGE_API_KEY "" CACHE STRING "API key for the CurseForge platform")
 set(Launcher_CURSEFORGE_API_KEY_API_URL "https://cf.polymc.org/api" CACHE STRING "URL to fetch the Curseforge API key from.")
 
+# Enable artificial DRM beyond what is forced by Mojang
+set(Launcher_STRICT_DRM OFF CACHE BOOL "Enables artificial DRM, beyond what is done by Mojang, that prevents you from using offline mode or custom yggdrasil without having a valid Minecraft account added first. This shouldn't need to be enabled unless you're distributing the software on some repo that would require you to enable it.")
 
 #### Check the current Git commit and branch
 include(GetGitRevisionDescription)
@@ -151,6 +153,13 @@ message(STATUS "Git refspec: ${Launcher_GIT_REFSPEC}")
 string(TIMESTAMP TODAY "%Y-%m-%d")
 set(Launcher_BUILD_TIMESTAMP "${TODAY}")
 
+############################ Macro Definitions #############################
+
+if (Launcher_STRICT_DRM)
+    message("Strict DRM is enabled.")
+    set(Launcher_APP_BINARY_DEFS ${Launcher_APP_BINARY_DEFS} LAUNCHER_STRICT_DRM)
+endif()
+
 ################################ 3rd Party Libs ################################
 
 # Find the required Qt parts

launcher/minecraft/auth/AccountList.h

@@ -109,6 +109,14 @@ public:
     MinecraftAccountPtr defaultAccount() const;
     void setDefaultAccount(MinecraftAccountPtr profileId);
     bool anyAccountIsValid();
+    bool drmCheck()
+    {
+#ifdef LAUNCHER_STRICT_DRM
+        return anyAccountIsValid();
+#else
+        return true;
+#endif
+    }
 
     bool isActive() const;
 

launcher/ui/MainWindow.cpp

@@ -1700,8 +1700,7 @@ void MainWindow::finalizeInstance(InstancePtr inst)
 {
     view->updateGeometries();
     setSelectedInstanceById(inst->id());
-    if (APPLICATION->accounts()->anyAccountIsValid())
-    {
+    if (APPLICATION->accounts()->drmCheck()) {
         ProgressDialog loadDialog(this);
         auto update = inst->createUpdateTask(Net::Mode::Online);
         connect(update.get(), &Task::failed, [this](QString reason)
@@ -1714,9 +1713,7 @@ void MainWindow::finalizeInstance(InstancePtr inst)
             loadDialog.setSkipButton(true, tr("Abort"));
             loadDialog.execWithTask(update.get());
         }
-    }
-    else
-    {
+    } else {
         CustomMessageBox::selectable(
             this,
             tr("Error"),

launcher/ui/pages/global/AccountListPage.cpp

@@ -188,7 +188,7 @@ void AccountListPage::on_actionAddMicrosoft_triggered()
 
 void AccountListPage::on_actionAddOffline_triggered()
 {
-    if (!m_accounts->anyAccountIsValid()) {
+    if (!m_accounts->drmCheck()) {
         QMessageBox::warning(
             this,
             tr("Error"),

launcher/ui/pages/instance/VersionPage.cpp

@@ -422,8 +422,7 @@ void VersionPage::on_actionChange_version_triggered()
 
 void VersionPage::on_actionDownload_All_triggered()
 {
-    if (!APPLICATION->accounts()->anyAccountIsValid())
-    {
+    if (!APPLICATION->accounts()->drmCheck()) {
         CustomMessageBox::selectable(
             this, tr("Error"),
             tr("Cannot download Minecraft or update instances unless you have at least "