[Feature][QGIS Server] Add configuration checker to project properties

To help user configuring project for QGIS Server, this code adds some tests to check the configuration.

The tests are:
* duplicate names or short names used as ows names
* check ows names with regexp
* check vector layer encodings are set

src/app/qgsprojectproperties.cpp

@@ -50,6 +50,10 @@
 #include "qgscolordialog.h"
 #include "qgsexpressioncontext.h"
 #include "qgsmapoverviewcanvas.h"
+#include "qgslayertreenode.h"
+#include "qgslayertreegroup.h"
+#include "qgslayertreelayer.h"
+#include "qgslayertreemodel.h"
 
 #include "qgsmessagelog.h"
 
@@ -1462,6 +1466,63 @@ void QgsProjectProperties::on_pbnWCSLayersUnselectAll_clicked()
   }
 }
 
+void QgsProjectProperties::on_pbnLaunchOWSChecker_clicked()
+{
+  QString myStyle = QgsApplication::reportStyleSheet();
+  teOWSChecker->clear();
+  teOWSChecker->document()->setDefaultStyleSheet( myStyle );
+  teOWSChecker->setHtml( "<h1>" + tr( "Start checking QGIS Server" ) + "</h1>" );
+
+  QStringList owsNames, encodingMessages;
+  checkOWS( QgisApp::instance()->layerTreeView()->layerTreeModel()->rootGroup(), owsNames, encodingMessages );
+
+  QStringList duplicateNames, regExpMessages;
+  QRegExp snRegExp = QgsApplication::shortNameRegExp();
+  Q_FOREACH ( QString name, owsNames )
+  {
+    if ( !snRegExp.exactMatch( name ) )
+      regExpMessages << tr( "Use short name for \"%1\"" ).arg( name );
+    if ( duplicateNames.contains( name ) )
+      continue;
+    if ( owsNames.count( name ) > 1 )
+      duplicateNames << name;
+  }
+
+  if ( duplicateNames.size() != 0 )
+  {
+    QString nameMessage = "<h1>" + tr( "Some layers and groups have the same name or short name" ) + "</h1>";
+    nameMessage += "<h2>" + tr( "Duplicate names:" ) + "</h2>";
+    nameMessage += duplicateNames.join( "</li><li>" ) + "</li></ul>";
+    teOWSChecker->setHtml( teOWSChecker->toHtml() + nameMessage );
+  }
+  else
+  {
+    teOWSChecker->setHtml( teOWSChecker->toHtml() + "<h1>" + tr( "All names and short names of layer and group are unique" ) + "</h1>" );
+  }
+
+  if ( regExpMessages.size() != 0 )
+  {
+    QString encodingMessage = "<h1>" + tr( "Some layer short names have to be updated:" ) + "</h1><ul><li>" + regExpMessages.join( "</li><li>" ) + "</li></ul>";
+    teOWSChecker->setHtml( teOWSChecker->toHtml() + encodingMessage );
+  }
+  else
+  {
+    teOWSChecker->setHtml( teOWSChecker->toHtml() + "<h1>" + tr( "All layer short names are well formed" ) + "</h1>" );
+  }
+
+  if ( encodingMessages.size() != 0 )
+  {
+    QString encodingMessage = "<h1>" + tr( "Some layer encodings are not set:" ) + "</h1><ul><li>" + encodingMessages.join( "</li><li>" ) + "</li></ul>";
+    teOWSChecker->setHtml( teOWSChecker->toHtml() + encodingMessage );
+  }
+  else
+  {
+    teOWSChecker->setHtml( teOWSChecker->toHtml() + "<h1>" + tr( "All layer encodings are set" ) + "</h1>" );
+  }
+
+  teOWSChecker->setHtml( teOWSChecker->toHtml() + "<h1>" + tr( "Start checking QGIS Server" ) + "</h1>" );
+}
+
 void QgsProjectProperties::on_pbnAddScale_clicked()
 {
   int myScale = QInputDialog::getInt(
@@ -1696,6 +1757,41 @@ void QgsProjectProperties::resetPythonMacros()
                             "def closeProject():\n    pass\n" );
 }
 
+void QgsProjectProperties::checkOWS( QgsLayerTreeGroup* treeGroup, QStringList& owsNames, QStringList& encodingMessages )
+{
+  QList< QgsLayerTreeNode * > treeGroupChildren = treeGroup->children();
+  for ( int i = 0; i < treeGroupChildren.size(); ++i )
+  {
+    QgsLayerTreeNode* treeNode = treeGroupChildren.at( i );
+    if ( treeNode->nodeType() == QgsLayerTreeNode::NodeGroup )
+    {
+      QgsLayerTreeGroup* treeGroupChild = static_cast<QgsLayerTreeGroup *>( treeNode );
+      QString shortName = treeGroupChild->customProperty( "wmsShortName" ).toString();
+      if ( shortName.isEmpty() )
+        owsNames << treeGroupChild->name();
+      else
+        owsNames << shortName;
+      checkOWS( treeGroupChild, owsNames, encodingMessages );
+    }
+    else
+    {
+      QgsLayerTreeLayer* treeLayer = static_cast<QgsLayerTreeLayer *>( treeNode );
+      QgsMapLayer* l = treeLayer->layer();
+      QString shortName = l->shortName();
+      if ( shortName.isEmpty() )
+        owsNames << l->name();
+      else
+        owsNames << shortName;
+      if ( l->type() == QgsMapLayer::VectorLayer )
+      {
+        QgsVectorLayer* vl = dynamic_cast<QgsVectorLayer *>( l );
+        if ( vl->dataProvider()->encoding() == "System" )
+          encodingMessages << tr( "Update layer \"%1\" encoding" ).arg( l->name() );
+      }
+    }
+  }
+}
+
 void QgsProjectProperties::populateEllipsoidList()
 {
   //

src/app/qgsprojectproperties.h

@@ -27,6 +27,7 @@ class QgsMapCanvas;
 class QgsRelationManagerDialog;
 class QgsStyleV2;
 class QgsExpressionContext;
+class QgsLayerTreeGroup;
 
 /** Dialog to set project level properties
 
@@ -119,6 +120,11 @@ class APP_EXPORT QgsProjectProperties : public QgsOptionsDialogBase, private Ui:
     void on_pbnWCSLayersSelectAll_clicked();
     void on_pbnWCSLayersUnselectAll_clicked();
 
+    /*!
+     * Slots to launch OWS test
+     */
+    void on_pbnLaunchOWSChecker_clicked();
+
     /*!
      * Slots for Styles
      */
@@ -210,6 +216,9 @@ class APP_EXPORT QgsProjectProperties : public QgsOptionsDialogBase, private Ui:
     QList<EllipsoidDefs> mEllipsoidList;
     int mEllipsoidIndex;
 
+    //! Check OWS configuration
+    void checkOWS( QgsLayerTreeGroup* treeGroup, QStringList& owsNames, QStringList& encodingMessages );
+
     //! Populates list with ellipsoids from Sqlite3 db
     void populateEllipsoidList();
 

src/ui/qgsprojectpropertiesbase.ui

@@ -2373,6 +2373,70 @@
                  </layout>
                 </widget>
                </item>
+               <item>
+                <widget class="QgsCollapsibleGroupBox" name="mOWSCheckerGroupBox">
+                 <property name="sizePolicy">
+                  <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+                   <horstretch>0</horstretch>
+                   <verstretch>3</verstretch>
+                  </sizepolicy>
+                 </property>
+                 <property name="title">
+                  <string>Test configuration</string>
+                 </property>
+                 <layout class="QVBoxLayout" name="verticalLayout_24">
+                  <item>
+                   <layout class="QHBoxLayout" name="horizontalLayout_11">
+                    <item>
+                     <widget class="QPushButton" name="pbnLaunchOWSChecker">
+                      <property name="text">
+                       <string>Launch</string>
+                      </property>
+                     </widget>
+                    </item>
+                    <item>
+                     <spacer name="horizontalSpacer_7">
+                      <property name="orientation">
+                       <enum>Qt::Horizontal</enum>
+                      </property>
+                      <property name="sizeHint" stdset="0">
+                       <size>
+                        <width>40</width>
+                        <height>20</height>
+                       </size>
+                      </property>
+                     </spacer>
+                    </item>
+                   </layout>
+                  </item>
+                  <item>
+                   <widget class="QTextEdit" name="teOWSChecker">
+                    <property name="enabled">
+                     <bool>true</bool>
+                    </property>
+                    <property name="minimumSize">
+                     <size>
+                      <width>0</width>
+                      <height>200</height>
+                     </size>
+                    </property>
+                    <property name="acceptDrops">
+                     <bool>true</bool>
+                    </property>
+                    <property name="lineWidth">
+                     <number>2</number>
+                    </property>
+                    <property name="readOnly">
+                     <bool>true</bool>
+                    </property>
+                    <property name="acceptRichText">
+                     <bool>true</bool>
+                    </property>
+                   </widget>
+                  </item>
+                 </layout>
+                </widget>
+               </item>
                <item>
                 <spacer name="verticalSpacer_6">
                  <property name="orientation">