Implemented application login.

Minor UI improvement.
Fixed memory leaks.

core/permissionservice.cpp

@@ -1,4 +1,9 @@
+#include "core-odb.hxx"
 #include "permissionservice.h"
+#include <QCryptographicHash>
+
+typedef odb::query<Permission> permQuery;
+typedef odb::result<Permission> permResult;
 
 PermissionService::PermissionService()
 {
@@ -36,3 +41,51 @@ QSharedPointer<Permission> PermissionService::forNameAndPlugin(const QString &na
     return p;
 }
 
+bool PermissionService::checkLogin(const QString &login, const QString &password)
+{
+
+    QSharedPointer<User> user = loadUser(login);
+    if (user.data())
+    {
+        return user->password() == encryptPassword(password) && user->active();
+    }
+
+    return false;
+}
+
+QSharedPointer<User> PermissionService::loadUser(const QString &login)
+{
+    odb::database *db = Context::instance().db();
+
+    Transaction tr;
+    return db->query_one<User>("login = " + odb::query<User>::_ref(login));
+}
+
+void PermissionService::checkForAdmin()
+{
+    odb::database *db = Context::instance().db();
+
+    Transaction tr;
+    odb::query<User> q(odb::query<User>::isAdmin == true);
+    odb::result<User> r = db->query<User>(q);
+
+    if (r.empty())
+    {
+        QSharedPointer<User> admin(new User);
+        admin->setLogin("admin");
+        admin->setName("Administrator");
+        admin->setIsAdmin(true);
+        admin->setPassword(encryptPassword("admin"));
+        admin->setActive(true);
+
+        db->persist(admin);
+    }
+
+    tr.commit();
+}
+
+QString PermissionService::encryptPassword(const QString &plainPasswd)
+{
+    return QString(QCryptographicHash::hash(plainPasswd.toUtf8(),QCryptographicHash::Sha256).toBase64());
+}
+