Do not allow same jabber credentials more than once.

src/delegateconfigwrapper.h

@@ -21,6 +21,7 @@
 #include <QDialog>
 #include <QDialogButtonBox>
 #include <QVBoxLayout>
+#include <QPushButton>
 
 class DelegateConfigWrapper : public QDialog
 {
@@ -39,6 +40,7 @@ public:
         v->addWidget( m_widget );
 
         QDialogButtonBox* buttons = new QDialogButtonBox( QDialogButtonBox::Ok | QDialogButtonBox::Cancel, Qt::Horizontal, this );
+        m_okButton = buttons->button( QDialogButtonBox::Ok );
         connect( buttons, SIGNAL( clicked( QAbstractButton*)  ), this, SLOT( closed( QAbstractButton* ) ) );
         connect( this, SIGNAL( rejected() ), this, SLOT( rejected() ) );
         v->addWidget( buttons );
@@ -57,6 +59,11 @@ public:
 
     }
 public slots:
+    void toggleOkButton( bool dataError )
+    {
+        // if dataError is True we want to set the button enabled to false
+        m_okButton->setEnabled( !dataError );
+    }
     void closed( QAbstractButton* b )
     {
         // let the config widget live to see another day
@@ -90,6 +97,7 @@ public slots:
 
 private:
     QWidget* m_widget;
+    QPushButton* m_okButton;
 };
 
 #endif

src/libtomahawk/sip/SipPlugin.h

@@ -113,6 +113,8 @@ signals:
 
     void addMenu( QMenu* menu );
     void removeMenu( QMenu* menu );
+    
+    void dataError( bool );
 
 private slots:
     void onError( int, const QString& );

src/settingsdialog.cpp

@@ -598,11 +598,13 @@ SettingsDialog::sipFactoryClicked( SipPluginFactory* factory )
         DelegateConfigWrapper* dialog = new DelegateConfigWrapper( p->configWidget(), QString("%1 Config" ).arg( p->friendlyName() ), this, Qt::Sheet );
         dialog->setProperty( "sipplugin", QVariant::fromValue< QObject* >( p ) );
         connect( dialog, SIGNAL( finished( int ) ), this, SLOT( sipCreateConfigClosed( int ) ) );
+        connect( p, SIGNAL( datatError( bool ) ), &dialog, SLOT( toggleOkButton( bool ) ) );
 
         dialog->show();
 #else
         DelegateConfigWrapper dialog( p->configWidget(), QString("%1 Config" ).arg( p->friendlyName() ), this );
         QWeakPointer< DelegateConfigWrapper > watcher( &dialog );
+        connect( p, SIGNAL( dataError( bool ) ), &dialog, SLOT( toggleOkButton( bool ) ) );
         int ret = dialog.exec();
         if( !watcher.isNull() && ret == QDialog::Accepted ) {
             // send changed config to resolver

src/sip/jabber/configwidget.ui

@@ -6,17 +6,14 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>433</width>
-    <height>260</height>
+    <width>451</width>
+    <height>335</height>
    </rect>
   </property>
   <property name="windowTitle">
    <string>Jabber Configuration</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_2">
-   <property name="topMargin">
-    <number>0</number>
-   </property>
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
@@ -185,6 +182,16 @@
         </item>
        </layout>
       </item>
+      <item>
+       <widget class="QLabel" name="jidExistsLabel">
+        <property name="text">
+         <string>An account with this name already exists!</string>
+        </property>
+        <property name="alignment">
+         <set>Qt::AlignCenter</set>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>

src/sip/jabber/jabber.cpp

@@ -80,11 +80,13 @@ JabberPlugin::JabberPlugin( const QString& pluginId )
     m_ui->jabberPassword->setText( readPassword() );
     m_ui->jabberServer->setText( readServer() );
     m_ui->jabberPort->setValue( readPort() );
+    m_ui->jidExistsLabel->hide();
     m_currentUsername = accountName();
     m_currentServer = readServer();
     m_currentPassword = readPassword();
     m_currentPort = readPort();
 
+    connect( m_ui->jabberUsername, SIGNAL( textChanged( QString ) ), SLOT( onCheckJidExists( QString ) ) );
     // setup JID object
     Jreen::JID jid = Jreen::JID( accountName() );
 
@@ -999,6 +1001,33 @@ JabberPlugin::readServer()
     return TomahawkSettings::instance()->value( pluginId() + "/server" ).toString();
 }
 
+
+void
+JabberPlugin::onCheckJidExists( QString jid )
+{
+    for ( int i=0; i<TomahawkSettings::instance()->sipPlugins().count(); i++ )
+    {
+        QString savedUsername = TomahawkSettings::instance()->value( 
+                TomahawkSettings::instance()->sipPlugins().at( i ) + "/username" ).toString();
+        QStringList splitUserName = TomahawkSettings::instance()->value(
+                TomahawkSettings::instance()->sipPlugins().at( i ) + "/username" ).toString().split("@");
+        QString server = TomahawkSettings::instance()->value(
+                TomahawkSettings::instance()->sipPlugins().at( i ) + "/server" ).toString();
+                
+        if ( ( savedUsername == jid || splitUserName.contains( jid ) ) && 
+               server == m_ui->jabberServer->text() && !jid.trimmed().isEmpty() )
+        {
+            m_ui->jidExistsLabel->show();
+            // the already jid exists
+            emit dataError( true );
+            return;
+        }
+    }
+    m_ui->jidExistsLabel->hide();
+    emit dataError( false );
+}
+
+
 void
 JabberPlugin::saveConfig()
 {

src/sip/jabber/jabber.h

@@ -85,6 +85,7 @@ public:
     virtual void deletePlugin();
 
 signals:
+    void dataError( bool exists );
     void jidChanged( const QString& );
 
 public slots:
@@ -118,6 +119,7 @@ private slots:
     }
     void onNewIq( const Jreen::IQ &iq );
     void onNewAvatar( const QString &jid );
+    void onCheckJidExists( QString jid );
 
 private:
     bool readXmlConsoleEnabled();