[FEATURE]: possibility to set MaxWidth and MaxHeight for GetMap request

src/app/qgsprojectproperties.cpp

@@ -229,6 +229,20 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas* mapCanvas, QWidget *pa
   bool addWktGeometry = QgsProject::instance()->readBoolEntry( "WMSAddWktGeometry", "/" );
   mAddWktGeometryCheckBox->setChecked( addWktGeometry );
 
+  //WMS maxWidth / maxHeight
+  mMaxWidthLineEdit->setValidator( new QIntValidator( mMaxWidthLineEdit ) );
+  int maxWidth = QgsProject::instance()->readNumEntry( "WMSMaxWidth", "/", -1 );
+  if ( maxWidth != -1 )
+  {
+    mMaxWidthLineEdit->setText( QString::number( maxWidth ) );
+  }
+  mMaxHeightLineEdit->setValidator( new QIntValidator( mMaxHeightLineEdit ) );
+  int maxHeight = QgsProject::instance()->readNumEntry( "WMSMaxHeight", "/", -1 );
+  if ( maxHeight != -1 )
+  {
+    mMaxHeightLineEdit->setText( QString::number( maxHeight ) );
+  }
+
   QStringList wfsLayerIdList = QgsProject::instance()->readListEntry( "WFSLayers", "/" );
 
   twWFSLayers->setColumnCount( 2 );
@@ -460,6 +474,25 @@ void QgsProjectProperties::apply()
 
   QgsProject::instance()->writeEntry( "WMSAddWktGeometry", "/", mAddWktGeometryCheckBox->isChecked() );
 
+  QString maxWidthText = mMaxWidthLineEdit->text();
+  if ( maxWidthText.isEmpty() )
+  {
+    QgsProject::instance()->removeEntry( "WMSMaxWidth", "/" );
+  }
+  else
+  {
+    QgsProject::instance()->writeEntry( "WMSMaxWidth", "/", maxWidthText.toInt() );
+  }
+  QString maxHeightText = mMaxHeightLineEdit->text();
+  if ( maxHeightText.isEmpty() )
+  {
+    QgsProject::instance()->removeEntry( "WMSMaxHeight", "/" );
+  }
+  else
+  {
+    QgsProject::instance()->writeEntry( "WMSMaxHeight", "/", maxHeightText.toInt() );
+  }
+
   QStringList wfsLayerList;
   for ( int i = 0; i < twWFSLayers->rowCount(); i++ )
   {

src/mapserver/qgsconfigparser.cpp

@@ -31,6 +31,8 @@ QgsConfigParser::QgsConfigParser()
     : mFallbackParser( 0 )
     , mScaleDenominator( 0 )
     , mOutputUnits( QgsMapRenderer::Millimeters )
+    , mMaxWidth( -1 )
+    , mMaxHeight( -1 )
 {
   setDefaultLegendSettings();
   mSelectionColor = QColor( 255, 255, 0 ); //yellow opaque is default selection color

src/mapserver/qgsconfigparser.h

@@ -121,6 +121,9 @@ class QgsConfigParser
     QColor selectionColor() const { return mSelectionColor; }
     void setSelectionColor( const QColor& c ) { mSelectionColor = c; }
 
+    int maxWidth() const { return mMaxWidth; }
+    int maxHeight() const { return mMaxHeight; }
+
   protected:
     /**Parser to forward not resolved requests (e.g. SLD parser based on user request might have a fallback parser with admin configuration)*/
     QgsConfigParser* mFallbackParser;
@@ -160,6 +163,10 @@ class QgsConfigParser
 
     QColor mSelectionColor;
 
+    //maximum width/height for the GetMap request. Disabled by default (-1)
+    int mMaxWidth;
+    int mMaxHeight;
+
     /**Transforms layer extent to epsg 4326 and appends ExGeographicBoundingBox and BoundingBox elements to the layer element*/
     void appendLayerBoundingBoxes( QDomElement& layerElem, QDomDocument& doc, const QgsRectangle& layerExtent, const QgsCoordinateReferenceSystem& layerCRS ) const;
 

src/mapserver/qgsprojectparser.cpp

@@ -45,6 +45,7 @@ QgsProjectParser::QgsProjectParser( QDomDocument* xmlDoc, const QString& filePat
   mOutputUnits = QgsMapRenderer::Millimeters;
   setLegendParametersFromProject();
   setSelectionColor();
+  setMaxWidthHeight();
 
   //accelerate search for layers and groups
   if ( mXMLDoc )
@@ -1439,6 +1440,27 @@ void QgsProjectParser::serviceCapabilities( QDomElement& parentElement, QDomDocu
   }
 
   serviceElem.appendChild( contactInfoElem );
+
+  //MaxWidth / MaxHeight for WMS 1.3
+  QString version = doc.documentElement().attribute( "version" );
+  if ( version != "1.1.1" )
+  {
+    if ( mMaxWidth != -1 )
+    {
+      QDomElement maxWidthElem = doc.createElement( "MaxWidth" );
+      QDomText maxWidthText = doc.createTextNode( QString::number( mMaxWidth ) );
+      maxWidthElem.appendChild( maxWidthText );
+      serviceElem.appendChild( maxWidthElem );
+    }
+    if ( mMaxHeight != -1 )
+    {
+      QDomElement maxHeightElem = doc.createElement( "MaxHeight" );
+      QDomText maxHeightText = doc.createTextNode( QString::number( mMaxHeight ) );
+      maxHeightElem.appendChild( maxHeightText );
+      serviceElem.appendChild( maxHeightElem );
+    }
+  }
+
   parentElement.appendChild( serviceElem );
 }
 
@@ -1541,6 +1563,31 @@ void QgsProjectParser::setSelectionColor()
   mSelectionColor = QColor( red, green, blue, alpha );
 }
 
+void QgsProjectParser::setMaxWidthHeight()
+{
+  if ( mXMLDoc )
+  {
+    QDomElement qgisElem = mXMLDoc->documentElement();
+    if ( !qgisElem.isNull() )
+    {
+      QDomElement propertiesElem = qgisElem.firstChildElement( "properties" );
+      if ( !propertiesElem.isNull() )
+      {
+        QDomElement maxWidthElem = propertiesElem.firstChildElement( "WMSMaxWidth" );
+        if ( !maxWidthElem.isNull() )
+        {
+          mMaxWidth = maxWidthElem.text().toInt();
+        }
+        QDomElement maxHeightElem = propertiesElem.firstChildElement( "WMSMaxHeight" );
+        if ( !maxHeightElem.isNull() )
+        {
+          mMaxHeight = maxHeightElem.text().toInt();
+        }
+      }
+    }
+  }
+}
+
 const QgsCoordinateReferenceSystem& QgsProjectParser::projectCRS() const
 {
   //mapcanvas->destinationsrs->spatialrefsys->authid

src/mapserver/qgsprojectparser.h

@@ -167,6 +167,8 @@ class QgsProjectParser: public QgsConfigParser
 
     /**Reads selection color from project and sets it to QgsConfigParser::mSelectionColor*/
     void setSelectionColor();
+    /**Reads maxWidth / maxHeight from project and sets it to QgsConfigParser::mMaxWidth / mMaxHeight*/
+    void setMaxWidthHeight();
 };
 
 #endif // QGSPROJECTPARSER_H

src/mapserver/qgswmsserver.cpp

@@ -669,6 +669,10 @@ QImage* QgsWMSServer::printCompositionToImage( QgsComposition* c ) const
 
 QImage* QgsWMSServer::getMap()
 {
+  if ( !checkMaximumWidthHeight() )
+  {
+    throw QgsMapServiceException( "Size error", "The requested map size is too large" );
+  }
   QStringList layersList, stylesList, layerIdList;
   QImage* theImage = initializeRendering( layersList, stylesList, layerIdList );
 
@@ -1994,3 +1998,31 @@ void QgsWMSServer::clearFeatureSelections( const QStringList& layerIds ) const
 
   return;
 }
+
+bool QgsWMSServer::checkMaximumWidthHeight() const
+{
+  //test if maxWidth / maxHeight set and WIDTH / HEIGHT parameter is in the range
+  if ( mConfigParser->maxWidth() != -1 )
+  {
+    QMap<QString, QString>::const_iterator widthIt = mParameterMap.find( "WIDTH" );
+    if ( widthIt != mParameterMap.constEnd() )
+    {
+      if ( widthIt->toInt() > mConfigParser->maxWidth() )
+      {
+        return false;
+      }
+    }
+  }
+  if ( mConfigParser->maxHeight() != -1 )
+  {
+    QMap<QString, QString>::const_iterator heightIt = mParameterMap.find( "HEIGHT" );
+    if ( heightIt != mParameterMap.constEnd() )
+    {
+      if ( heightIt->toInt() > mConfigParser->maxHeight() )
+      {
+        return false;
+      }
+    }
+  }
+  return true;
+}

src/mapserver/qgswmsserver.h

@@ -163,6 +163,10 @@ class QgsWMSServer
 
     void appendFormats( QDomDocument &doc, QDomElement &elem, const QStringList &formats );
 
+    /**Checks WIDTH/HEIGHT values agains MaxWidth and MaxHeight
+      @return true if width/height values are okay*/
+    bool checkMaximumWidthHeight() const;
+
     /**Map containing the WMS parameters*/
     QMap<QString, QString> mParameterMap;
     QgsConfigParser* mConfigParser;

src/ui/qgsprojectpropertiesbase.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>676</width>
-    <height>522</height>
+    <width>571</width>
+    <height>448</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -368,7 +368,7 @@
        <string>OWS Server</string>
       </attribute>
       <layout class="QGridLayout" name="gridLayout_3">
-       <item row="0" column="0" rowspan="2">
+       <item row="0" column="0">
         <widget class="QScrollArea" name="scrollArea">
          <property name="widgetResizable">
           <bool>true</bool>
@@ -377,13 +377,13 @@
           <property name="geometry">
            <rect>
             <x>0</x>
-            <y>0</y>
-            <width>616</width>
-            <height>538</height>
+            <y>-271</y>
+            <width>526</width>
+            <height>668</height>
            </rect>
           </property>
-          <layout class="QGridLayout" name="gridLayout_7">
-           <item row="0" column="0" colspan="2">
+          <layout class="QGridLayout" name="gridLayout">
+           <item row="0" column="0">
             <widget class="QGroupBox" name="grpOWSServiceCapabilities">
              <property name="title">
               <string>Service Capabilitities</string>
@@ -483,7 +483,7 @@
              </layout>
             </widget>
            </item>
-           <item row="1" column="0" colspan="2">
+           <item row="1" column="0">
             <widget class="QGroupBox" name="grpWMSCapabilities">
              <property name="title">
               <string>WMS Capabilitities</string>
@@ -641,7 +641,31 @@
              </layout>
             </widget>
            </item>
-           <item row="3" column="0" colspan="2">
+           <item row="2" column="0">
+            <layout class="QHBoxLayout" name="horizontalLayout_2">
+             <item>
+              <widget class="QLabel" name="mMaxWidthLabel">
+               <property name="text">
+                <string>Maximum width</string>
+               </property>
+              </widget>
+             </item>
+             <item>
+              <widget class="QLineEdit" name="mMaxWidthLineEdit"/>
+             </item>
+             <item>
+              <widget class="QLabel" name="mMaxHeightLabel">
+               <property name="text">
+                <string>Maximum height</string>
+               </property>
+              </widget>
+             </item>
+             <item>
+              <widget class="QLineEdit" name="mMaxHeightLineEdit"/>
+             </item>
+            </layout>
+           </item>
+           <item row="3" column="0">
             <widget class="QGroupBox" name="grpWFSCapabilities">
              <property name="title">
               <string>WFS Capabilitities</string>