Nicer implementation of the handling of administrative rights

src/Lib/lablib.cpp

@@ -76,11 +76,12 @@ lc::Lablib::~Lablib () {
     delete webcams;
 }
 
-bool lc::Lablib::CheckIfUserIsAdmin( const QString &argUserName ) const {
+bool lc::Lablib::CheckIfUserIsAdmin() const {
     for ( const auto &s : adminUsers ) {
-        if ( s == argUserName ) {
+        if ( s == settings->localUserName ) {
             debugMessagesTextEdit->appendPlainText( tr( "[DEBUG] User '%1' has administrative"
-                                                        " rights." ).arg( argUserName ) );
+                                                        " rights." )
+                                                    .arg( settings->localUserName ) );
             return true;
         }
     }
@@ -295,11 +296,6 @@ void lc::Lablib::SetPrintReceiptsForLocalClients( const bool &argPrintReceiptsFo
     debugMessagesTextEdit->appendPlainText( tr( "[DEBUG] Set print_receipts_for_local_clients to : '%1'" ).arg( QString::number( PrintReceiptsForLocalClients ) ) );
 }
 
-void lc::Lablib::SetUserNameOnServer( const QString &argUserName ) {
-    userNameOnServer = argUserName;
-    debugMessagesTextEdit->appendPlainText( tr( "[DEBUG] user_name_on_server set to: '%1'" ).arg( userNameOnServer ) );
-}
-
 void lc::Lablib::ShowOrsee() {
     QProcess showOrseeProcess;
     QProcessEnvironment env = QProcessEnvironment::systemEnvironment();

src/Lib/lablib.h

@@ -71,7 +71,7 @@ public:
      * \param argUserName The account name which shall checked for administrative rights
      * \return True, if the account has administrative rights; false, otherwise
      */
-    bool CheckIfUserIsAdmin( const QString &argUserName ) const;
+    bool CheckIfUserIsAdmin() const;
     /*! Returns the currently set port number of zTree
      *
      * @return The currently set port number for zTree
@@ -107,11 +107,6 @@ public:
      * @return True if receipts for local clients shall be printed
      */
     bool GetPrintReceiptsForLocalClients() const { return PrintReceiptsForLocalClients; }
-    /** Returns a pointer to server's user's name
-     *
-     * @return A pointer to the server's user's name
-     */
-    QString GetUserNameOnServer () const { return userNameOnServer; }
     /** Returns a QStringList containing all available LaTeX headers of this system
      *
      * @return A pointer to a QStringList containing all available LaTeX headers
@@ -135,7 +130,6 @@ public:
      */
     void SetLocalZLeafDefaultName( const QString &argName );
     void SetPrintReceiptsForLocalClients( const bool &argPrintReceiptsForLocalClients );
-    void SetUserNameOnServer( const QString &argUserName );
     void ShowOrsee();
     void ShowPreprints();
 
@@ -176,7 +170,6 @@ private:
     QVector< int > *occupiedPorts = nullptr;
     bool PrintReceiptsForLocalClients = true;
     SessionsModel *sessionsModel = nullptr;        //! A derivation from QAbstractTableModel used to store the single Session instances
-    QString userNameOnServer;         //! The user name on the server as extracted from the environment variables
     QStringList *webcams = nullptr;                 //! A QStringList containing all available stationary webcams in the laboratory
 };
 

src/Lib/settings.cpp

@@ -1,5 +1,6 @@
 #include <QDebug>
 #include <QFile>
+#include <QProcessEnvironment>
 
 #include "settings.h"
 
@@ -20,6 +21,7 @@ lc::Settings::Settings( const QSettings &argSettings, QObject *argParent ) :
     lcInstDir{ ReadSettingsItem( "labcontrol_installation_directory",
                                  "Labcontrol will missbehave with high propability.",
                                  argSettings, true ) },
+    localUserName{ GetLocalUserName() },
     lprCmd{ ReadSettingsItem( "lpr_command",
                               "Receipts printing will not work.",
                               argSettings, true ) },
@@ -103,6 +105,22 @@ bool lc::Settings::CheckPathAndComplain( const QString &argPath, const QString &
     return true;
 }
 
+QString lc::Settings::GetLocalUserName() {
+    const QProcessEnvironment env{ QProcessEnvironment::systemEnvironment() };
+    QString userName;
+    // For Linux
+    if ( env.contains( "USER" ) ) {
+        userName = env.value( "USER", "" );
+        qDebug() << "The local user name is" << userName;
+    } else if ( env.contains( "USERNAME" ) ) { // For Windows
+        userName = env.value( "USERNAME", "" );
+        qDebug() << "The local user name is" << userName;
+    } else {
+        qWarning() << "The local user name could not be queried";
+    }
+    return userName;
+}
+
 QString lc::Settings::ReadSettingsItem( const QString &argVariableName,
                                         const QString &argMessage,
                                         const QSettings &argSettings,

src/Lib/settings.h

@@ -25,6 +25,7 @@ public:
     const QString fileMngr;
     const QString latexCmd;
     const QString lcInstDir;
+    const QString localUserName;
     const QString lprCmd;
     const QString netstatCmd;
     const QString netwBrdAddr;
@@ -51,6 +52,7 @@ public:
 private:
     static bool CheckPathAndComplain( const QString &argPath, const QString &argVariableName,
                                       const QString &argMessage );
+    static QString GetLocalUserName();
     static QString ReadSettingsItem( const QString &argVariableName,
                                      const QString &argMessage,
                                      const QSettings &argSettings,

src/mainwindow.cpp

@@ -52,17 +52,7 @@ lc::MainWindow::~MainWindow() {
 }
 
 bool lc::MainWindow::CheckIfUserIsAdmin() {
-    // Query the current user's name or give an error if this fails
+    if ( settings->localUserName.isEmpty() ) {
-    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
-    QString userName;
-    // For Linux
-    if ( env.contains( "USER" ) ) {
-        userName = env.value( "USER", "" );
-    } else if ( env.contains( "USERNAME" ) ) { // For Windows
-        userName = env.value( "USERNAME", "" );
-    }
-
-    if ( userName.isEmpty() ) {
         QMessageBox messageBox{ QMessageBox::Warning, tr( "User not detectable" ),
                                 tr( "Your user name could not be queryed. The admin tab will be"
                                     " disabled. You won't be able to perform administrative"
@@ -73,10 +63,9 @@ bool lc::MainWindow::CheckIfUserIsAdmin() {
     }
 
     ui->PTEDebugMessages->appendPlainText( tr( "[DEBUG] The user's name is %1." )
-                                           .arg( userName ) );
+                                           .arg( settings->localUserName ) );
-    lablib->SetUserNameOnServer( userName );
 
-    return lablib->CheckIfUserIsAdmin( userName );
+    return lablib->CheckIfUserIsAdmin();
 }
 
 void lc::MainWindow::DisableDisfunctionalWidgets() {
@@ -695,7 +684,7 @@ void lc::MainWindow::SetupWidgets() {
     } else {
         ui->LAdministrativeRights->setText( tr( "You don't have administrative rights." ) );
     }
-    ui->LUserName->setText( tr( "You are user %1" ).arg( lablib->GetUserNameOnServer() ) );
+    ui->LUserName->setText( tr( "You are user %1" ).arg( settings->localUserName ) );
     if ( !settings->userNameOnClients.isEmpty() ) {
         ui->RBUseLocalUser->setText( settings->userNameOnClients );
     } else {