add QQmlEngine::offlineStorageDatabaseFilePath(db), use in LocalStorage

This is C++ API to get the actual storage path for a particular database.

[ChangeLog][QtQml] Added QQmlEngine::offlineStorageDatabaseFilePath(dbName)
to allow getting the actual storage path for a particular database.

Task-number: QTBUG-52013
Change-Id: I1cbd9454c537f08c97f4dafc06fd6b14e81c51af
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlengine/tst_qqmlengine.cpp b/tests/auto/qml/qqmlengine/tst_qqmlengine.cpp
index 9c155eda5b..e170920486 100644
--- a/tests/auto/qml/qqmlengine/tst_qqmlengine.cpp
+++ b/tests/auto/qml/qqmlengine/tst_qqmlengine.cpp
@@ -56,6 +56,7 @@ private slots:
     void baseUrl();
     void contextForObject();
     void offlineStoragePath();
+    void offlineDatabaseStoragePath();
     void clearComponentCache();
     void trimComponentCache();
     void trimComponentCache_data();
@@ -252,6 +253,34 @@ void tst_qqmlengine::offlineStoragePath()
     QCOMPARE(engine.offlineStoragePath(), QDir::homePath());
 }
 
+void tst_qqmlengine::offlineDatabaseStoragePath()
+{
+    // Without these set, QDesktopServices::storageLocation returns
+    // strings with extra "//" at the end. We set them to ignore this problem.
+    qApp->setApplicationName("tst_qqmlengine");
+    qApp->setOrganizationName("QtProject");
+    qApp->setOrganizationDomain("www.qt-project.org");
+
+    QQmlEngine engine;
+    QString dataLocation = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
+    const QString databaseName = QLatin1String("foo");
+    QString databaseLocation = engine.offlineStorageDatabaseFilePath(databaseName);
+    QCOMPARE(dataLocation.isEmpty(), databaseLocation.isEmpty());
+
+    QDir dir(dataLocation);
+    dir.mkpath("QML");
+    dir.cd("QML");
+    dir.mkpath("OfflineStorage");
+    dir.cd("OfflineStorage");
+    dir.mkpath("Databases");
+    dir.cd("Databases");
+    QCOMPARE(QFileInfo(databaseLocation).dir().path(), dir.path());
+
+    QCryptographicHash md5(QCryptographicHash::Md5);
+    md5.addData(databaseName.toUtf8());
+    QCOMPARE(databaseLocation, QDir::toNativeSeparators(dir.filePath(QLatin1String(md5.result().toHex()))));
+}
+
 void tst_qqmlengine::clearComponentCache()
 {
     QQmlEngine engine;