Manage external layers like highlight layers for consistency

src/server/services/wms/qgswmsparameters.cpp

@@ -1408,6 +1408,10 @@ namespace QgsWms
     for ( int i = 0; i < layers.size(); i++ )
     {
       QString layer = layers[i];
+
+      if ( layer.startsWith( QStringLiteral( "EXTERNAL_WMS:" ) ) )
+        continue;
+
       QgsWmsParametersLayer param;
       param.mNickname = layer;
 
@@ -1492,6 +1496,27 @@ namespace QgsWms
     return params;
   }
 
+  QList<QgsWmsParametersExternalLayer> QgsWmsParameters::externalLayersParameters() const
+  {
+    QList<QgsWmsParametersExternalLayer> externalLayers;
+
+    const QStringList layers = allLayersNickname();
+    for ( const QString &layer : allLayersNickname() )
+    {
+      if ( ! layer.startsWith( QStringLiteral( "EXTERNAL_WMS:" ) ) )
+        continue;
+
+      QgsWmsParametersExternalLayer externalLayer;
+      externalLayer.mName = layer;
+      externalLayer.mName.remove( 0, 13 );
+      externalLayer.mUri = externalWMSUri( externalLayer.mName );
+
+      externalLayers << externalLayer;
+    }
+
+    return externalLayers;
+  }
+
   QString QgsWmsParameters::backgroundColor() const
   {
     return mWmsParameters[ QgsWmsParameter::BGCOLOR ].toString();
@@ -1577,13 +1602,35 @@ namespace QgsWms
     }
 
     //layers
-    QStringList layers;
+    QStringList allLayers;
     wmsParam = idParameter( QgsWmsParameter::LAYERS, mapId );
     if ( wmsParam.isValid() )
     {
-      layers = wmsParam.toStringList();
+      allLayers = wmsParam.toStringList();
     }
 
+    // external layers
+    QStringList layers;
+    QList<QgsWmsParametersExternalLayer> eParams;
+
+    for ( const auto &layer : allLayers )
+    {
+      if ( layer.startsWith( QStringLiteral( "EXTERNAL_WMS:" ) ) )
+      {
+        QgsWmsParametersExternalLayer externalParam;
+        externalParam.mName = layer;
+        externalParam.mName.remove( 0, 13 );
+        externalParam.mUri = externalWMSUri( externalParam.mName );
+
+        eParams << externalParam;
+      }
+      else
+      {
+        layers << layer;
+      }
+    }
+    param.mExternalLayers = eParams;
+
     QStringList styles;
     wmsParam = idParameter( QgsWmsParameter::STYLES, mapId );
     if ( wmsParam.isValid() )

src/server/services/wms/qgswmsparameters.h

@@ -55,6 +55,12 @@ namespace QgsWms
     QString mStyle;
   };
 
+  struct QgsWmsParametersExternalLayer
+  {
+    QString mName;
+    QString mUri;
+  };
+
   struct QgsWmsParametersHighlightLayer
   {
     QString mName;
@@ -79,6 +85,7 @@ namespace QgsWms
     float mGridX = 0;
     float mGridY = 0;
     QList<QgsWmsParametersLayer> mLayers; // list of layers for this composer map
+    QList<QgsWmsParametersExternalLayer> mExternalLayers; // list of external layers for this composer map
     QList<QgsWmsParametersHighlightLayer> mHighlightLayers; // list of highlight layers for this composer map
   };
 
@@ -944,6 +951,8 @@ namespace QgsWms
        */
       QList<QgsWmsParametersHighlightLayer> highlightLayersParameters() const;
 
+      QList<QgsWmsParametersExternalLayer> externalLayersParameters() const;
+
       /**
        * Returns HIGHLIGHT_GEOM as a list of string in WKT.
        * \returns highlight geometries

src/server/services/wms/qgswmsrenderer.cpp

@@ -653,13 +653,14 @@ namespace QgsWms
 
       if ( !map->keepLayerSet() )
       {
-        if ( cMapParams.mLayers.isEmpty() )
+        if ( cMapParams.mLayers.isEmpty() && cMapParams.mExternalLayers.isEmpty() )
         {
           map->setLayers( mapSettings.layers() );
         }
         else
         {
           QList<QgsMapLayer *> layerSet = stylizedLayers( cMapParams.mLayers );
+          layerSet << externalLayers( cMapParams.mExternalLayers );
           layerSet << highlightLayers( cMapParams.mHighlightLayers );
           std::reverse( layerSet.begin(), layerSet.end() );
           map->setLayers( layerSet );
@@ -856,6 +857,9 @@ namespace QgsWms
       setLayerAccessControlFilter( layer );
     }
 
+    // add external layers
+    layers = layers << externalLayers( mWmsParameters.externalLayersParameters() );
+
     // add highlight layers above others
     layers = layers << highlightLayers( mWmsParameters.highlightLayersParameters() );
 
@@ -2914,6 +2918,26 @@ namespace QgsWms
     return highlightLayers;
   }
 
+  QList<QgsMapLayer *> QgsRenderer::externalLayers( const QList<QgsWmsParametersExternalLayer> &params )
+  {
+    QList<QgsMapLayer *> layers;
+
+    for ( const QgsWmsParametersExternalLayer &param : params )
+    {
+      std::unique_ptr<QgsMapLayer> layer;
+      layer.reset( new QgsRasterLayer( param.mUri, param.mName, QStringLiteral( "wms" ) ) );
+
+      if ( layer->isValid() )
+      {
+        // to delete later
+        mTemporaryLayers.append( layer.release() );
+        layers << mTemporaryLayers.last();
+      }
+    }
+
+    return layers;
+  }
+
   QList<QgsMapLayer *> QgsRenderer::sldStylizedLayers( const QString &sld ) const
   {
     QList<QgsMapLayer *> layers;
@@ -2976,19 +3000,7 @@ namespace QgsWms
     {
       QString nickname = param.mNickname;
       QString style = param.mStyle;
-      if ( nickname.startsWith( "EXTERNAL_WMS:" ) )
-      {
-        QString externalLayerId = nickname;
-        externalLayerId.remove( 0, 13 );
-        QgsMapLayer *externalWMSLayer = createExternalWMSLayer( externalLayerId );
-        if ( externalWMSLayer )
-        {
-          layers.append( externalWMSLayer );
-          mNicknameLayers[nickname] = externalWMSLayer; //might be used later in GetPrint request
-          mTemporaryLayers.append( externalWMSLayer );
-        }
-      }
-      else if ( mNicknameLayers.contains( nickname ) && !mRestrictedLayers.contains( nickname ) )
+      if ( mNicknameLayers.contains( nickname ) && !mRestrictedLayers.contains( nickname ) )
       {
         if ( !style.isEmpty() )
         {
@@ -3032,19 +3044,6 @@ namespace QgsWms
     return layers;
   }
 
-  QgsMapLayer *QgsRenderer::createExternalWMSLayer( const QString &externalLayerId ) const
-  {
-    QString wmsUri = mWmsParameters.externalWMSUri( externalLayerId.toUpper() );
-    QgsMapLayer *wmsLayer = new QgsRasterLayer( wmsUri, externalLayerId, QStringLiteral( "wms" ) );
-    if ( !wmsLayer->isValid() )
-    {
-      delete wmsLayer;
-      return nullptr;
-    }
-
-    return wmsLayer;
-  }
-
   void QgsRenderer::removeTemporaryLayers()
   {
     qDeleteAll( mTemporaryLayers );

src/server/services/wms/qgswmsrenderer.h

@@ -122,6 +122,9 @@ namespace QgsWms
       // Build and returns highlight layers
       QList<QgsMapLayer *> highlightLayers( QList<QgsWmsParametersHighlightLayer> params );
 
+      // Build and returns external layers
+      QList<QgsMapLayer *> externalLayers( const QList<QgsWmsParametersExternalLayer> &params );
+
       // Init a map with nickname for layers' project
       void initNicknameLayers();
 
@@ -289,9 +292,6 @@ namespace QgsWms
        * */
       bool configurePrintLayout( QgsPrintLayout *c, const QgsMapSettings &mapSettings, bool atlasPrint = false );
 
-      //! Creates external WMS layer. Caller takes ownership
-      QgsMapLayer *createExternalWMSLayer( const QString &externalLayerId ) const;
-
       void removeTemporaryLayers();
 
       void handlePrintErrors( const QgsLayout *layout ) const;