From 3a5317f16a35a3b11d978589e876ab5702c29710 Mon Sep 17 00:00:00 2001
From: Dmitriy Karpushin <kolobchanin@gmail.com>
Date: Thu, 23 Mar 2023 15:13:15 +0300
Subject: [PATCH] Implementation of "migration manager" to fix placement of
 config files issue appeared after moving from Qt 5 to Qt 6

---
 client/CMakeLists.txt |  2 +
 client/main.cpp       |  4 ++
 client/migrations.cpp | 86 +++++++++++++++++++++++++++++++++++++++++++
 client/migrations.h   | 24 ++++++++++++
 4 files changed, 116 insertions(+)
 create mode 100644 client/migrations.cpp
 create mode 100644 client/migrations.h

diff --git a/client/CMakeLists.txt b/client/CMakeLists.txt
index 50d6d0f7..605a4d09 100644
--- a/client/CMakeLists.txt
+++ b/client/CMakeLists.txt
@@ -59,6 +59,7 @@ include_directories(
 )
 
 set(HEADERS ${HEADERS}
+    ${CMAKE_CURRENT_LIST_DIR}/migrations.h
     ${CMAKE_CURRENT_LIST_DIR}/../ipc/ipc.h
     ${CMAKE_CURRENT_LIST_DIR}/amnezia_application.h
     ${CMAKE_CURRENT_LIST_DIR}/containers/containers_defs.h
@@ -85,6 +86,7 @@ if(NOT IOS)
 endif()
 
 set(SOURCES ${SOURCES}
+    ${CMAKE_CURRENT_LIST_DIR}/migrations.cpp
     ${CMAKE_CURRENT_LIST_DIR}/amnezia_application.cpp
     ${CMAKE_CURRENT_LIST_DIR}/containers/containers_defs.cpp
     ${CMAKE_CURRENT_LIST_DIR}/core/errorstrings.cpp
diff --git a/client/main.cpp b/client/main.cpp
index 62685953..f20c5dd1 100644
--- a/client/main.cpp
+++ b/client/main.cpp
@@ -4,6 +4,7 @@
 
 #include "amnezia_application.h"
 #include "defines.h"
+#include "migrations.h"
 
 #ifdef Q_OS_WIN
 #include "Windows.h"
@@ -16,6 +17,9 @@
 
 int main(int argc, char *argv[])
 {
+    Migrations migrationsManager;
+    migrationsManager.doMigrations();
+
     QLoggingCategory::setFilterRules(QStringLiteral("qtc.ssh=false"));
     QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
 
diff --git a/client/migrations.cpp b/client/migrations.cpp
new file mode 100644
index 00000000..6fac6be7
--- /dev/null
+++ b/client/migrations.cpp
@@ -0,0 +1,86 @@
+#include "migrations.h"
+
+#include <QDebug>
+#include <QDir>
+#include <QFile>
+#include <QStandardPaths>
+
+#include "defines.h"
+
+Migrations::Migrations(QObject *parent)
+    : QObject{parent}
+{
+    QString version(APP_MAJOR_VERSION);
+
+    QStringList versionDigits = version.split(".");
+
+    if (versionDigits.size() >= 3) {
+        currentMajor = versionDigits[0].toInt();
+        currentMinor = versionDigits[1].toInt();
+        currentMicro = versionDigits[2].toInt();
+    }
+
+    if (versionDigits.size() == 4) {
+        currentPatch = versionDigits[3].toInt();
+    }
+}
+
+void Migrations::doMigrations()
+{
+    if (currentMajor == 3) {
+        migrateV3();
+    }
+}
+
+void Migrations::migrateV3()
+{
+#ifdef Q_OS_ANDROID
+    qDebug() << "Migration to V3 on Android...";
+
+    QString packageName = "org.amnezia.vpn";
+
+    QDir dir(".");
+    QString currentDir = dir.absolutePath();
+
+    int packageNameIndex = currentDir.indexOf(packageName);
+
+    if (packageNameIndex == -1) {
+        return;
+    }
+
+    QString rootLocation = currentDir.left(packageNameIndex + packageName.size());
+
+    if (rootLocation.isEmpty()) {
+        return;
+    }
+
+    QString location = rootLocation + "/files/.config/AmneziaVPN.ORG/AmneziaVPN.conf";
+
+    QFile oldConfig(location);
+
+    if (oldConfig.exists()) {
+        QString newConfigPath = rootLocation + "/files/settings";
+
+        QDir newConfigDir(newConfigPath);
+
+        newConfigPath += "/AmneziaVPN.ORG";
+
+        bool mkPathRes = newConfigDir.mkpath(newConfigPath);
+
+        if (!mkPathRes) {
+            return;
+        }
+
+        QFile newConfigFile(newConfigPath + "/AmneziaVPN.conf");
+
+        if (!newConfigFile.exists()) {
+            bool cpResult = QFile::copy(oldConfig.fileName(), newConfigFile.fileName());
+            if (cpResult) {
+                oldConfig.remove();
+                QDir oldConfigDir(rootLocation + "/files/.config");
+                oldConfigDir.rmdir("AmneziaVPN.ORG");
+            }
+        }
+    }
+#endif
+}
diff --git a/client/migrations.h b/client/migrations.h
new file mode 100644
index 00000000..ea6bae92
--- /dev/null
+++ b/client/migrations.h
@@ -0,0 +1,24 @@
+#ifndef MIGRATIONS_H
+#define MIGRATIONS_H
+
+#include <QObject>
+
+class Migrations : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Migrations(QObject *parent = nullptr);
+
+    void doMigrations();
+
+private:
+    void migrateV3();
+
+private:
+    int currentMajor = 0;
+    int currentMinor = 0;
+    int currentMicro = 0;
+    int currentPatch = 0;
+};
+
+#endif // MIGRATIONS_H