add test macros AMNEZIA_QR_PAIRING_ALLOW_DUPLICATE_VPN_KEY & disable ApiConfigAlreadyAdded

client/CMakeLists.txt

@@ -208,6 +208,10 @@ if(AMNEZIA_LOCAL_GATEWAY)
     target_compile_definitions(${PROJECT} PRIVATE AMNEZIA_LOCAL_GATEWAY)
 endif()
 
+if(AMNEZIA_QR_PAIRING_ALLOW_DUPLICATE_VPN_KEY)
+    target_compile_definitions(${PROJECT} PRIVATE AMNEZIA_QR_PAIRING_ALLOW_DUPLICATE_VPN_KEY)
+endif()
+
 target_sources(${PROJECT} PRIVATE ${SOURCES} ${HEADERS} ${RESOURCES} ${QRC} ${I18NQRC})
 
 # Finalize the executable so Qt can gather/deploy QML modules and plugins correctly (Android needs this).

client/core/controllers/api/subscriptionController.cpp

@@ -1,5 +1,6 @@
 #include "subscriptionController.h"
 
+#include <QCoreApplication>
 #include <QDebug>
 #include <QDateTime>
 #include <QEventLoop>
@@ -338,7 +339,9 @@ ErrorCode SubscriptionController::importServerFromQrPairingResponse(const QStrin
             if (duplicateServerIndex) {
                 *duplicateServerIndex = i;
             }
+#ifndef AMNEZIA_QR_PAIRING_ALLOW_DUPLICATE_VPN_KEY
             return ErrorCode::ApiConfigAlreadyAdded;
+#endif
         }
     }
 
@@ -384,6 +387,24 @@ ErrorCode SubscriptionController::importServerFromQrPairingResponse(const QStrin
         apiV2->apiConfig.vpnKey = fullKey;
     }
 
+#ifdef AMNEZIA_QR_PAIRING_ALLOW_DUPLICATE_VPN_KEY
+    static int existingSameKeyCount = 0;
+    if (apiV2) {
+        ++existingSameKeyCount;
+        const QString suffix = QCoreApplication::translate("SubscriptionController", " (paired copy %1)")
+                .arg(existingSameKeyCount);
+
+        if (!apiV2->name.isEmpty()) {
+            apiV2->name += suffix;
+        } else if (!apiV2->description.isEmpty()) {
+            apiV2->description += suffix;
+        } else {
+            apiV2->name = QCoreApplication::translate("SubscriptionController", "Paired subscription %1")
+                    .arg(existingSameKeyCount);
+        }
+    }
+#endif
+
     m_serversRepository->addServer(serverConfigModel);
     serverConfig = serverConfigModel;
     return ErrorCode::NoError;