qgswmslayerinfos.cpp

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/***************************************************************************
                              qgswmslayerinfos.cpp
 
  Layer's information
  ------------------------------------
  begin                : September 26 , 2022
  copyright            : (C) 2022 by René-Luc D'Hont and David Marteau
  email                : rldhont at 3liz doc com
         dmarteau at 3liz dot com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgswmslayerinfos.h"
 
#include <algorithm>
 
#include "qgscoordinatetransform.h"
#include "qgsmaplayerstylemanager.h"
#include "qgsmessagelog.h"
#include "qgsproject.h"
#include "qgsserverinterface.h"
#include "qgsserverprojectutils.h"
#include "qgsvectorlayer.h"
 
#include <QString>
 
using namespace Qt::StringLiterals;
 
QgsRectangle QgsWmsLayerInfos::transformExtent(
  const QgsRectangle &extent, const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination, const QgsCoordinateTransformContext &context, const bool &ballparkTransformsAreAppropriate
)
{
  QgsCoordinateTransform transformer { source, destination, context };
  transformer.setBallparkTransformsAreAppropriate( ballparkTransformsAreAppropriate );
  // Transform extent and do not catch exception
  return transformer.transformBoundingBox( extent );
}
 
QMap<QString, QgsRectangle> QgsWmsLayerInfos::transformExtentToCrsList(
  const QgsRectangle &extent, const QgsCoordinateReferenceSystem &source, const QList<QgsCoordinateReferenceSystem> &destinations, const QgsCoordinateTransformContext &context
)
{
  QMap<QString, QgsRectangle> crsExtents;
  if ( extent.isEmpty() )
  {
    return crsExtents;
  }
  for ( const QgsCoordinateReferenceSystem &destination : std::as_const( destinations ) )
  {
    // Transform extent and do not catch exception
    QgsCoordinateTransform crsTransform { source, destination, context };
    crsExtents[destination.authid()] = crsTransform.transformBoundingBox( extent );
  }
  return crsExtents;
}
 
 
bool setBoundingRect(
  const QgsProject *project, QgsWmsLayerInfos &pLayer, QgsMapLayer *ml, const QgsRectangle &wmsExtent, const QgsCoordinateReferenceSystem &wgs84, const QList<QgsCoordinateReferenceSystem> &outputCrsList
)
{
  QgsRectangle layerExtent = ml->extent();
  if ( layerExtent.isEmpty() )
  {
    // if the extent is empty (not only Null), use the wms extent
    // defined in the project...
    if ( wmsExtent.isNull() )
    {
      // or the CRS extent otherwise
      layerExtent = ml->crs().bounds();
    }
    else
    {
      layerExtent = QgsRectangle( wmsExtent );
      if ( ml->crs() != project->crs() )
      {
        // If CRS is different transform it to layer's CRS
        try
        {
          layerExtent = QgsWmsLayerInfos::transformExtent( wmsExtent, project->crs(), ml->crs(), project->transformContext() );
        }
        catch ( QgsCsException &cse )
        {
          QgsMessageLog::logMessage( u"Error transforming extent for layer %1: %2"_s.arg( ml->name() ).arg( cse.what() ), u"Server"_s, Qgis::MessageLevel::Warning );
          return false;
        }
      }
    }
 
    // Now we have a layer Extent we need the WGS84 bounding rectangle
    try
    {
      pLayer.wgs84BoundingRect = QgsWmsLayerInfos::transformExtent( layerExtent, ml->crs(), wgs84, project->transformContext(), true );
    }
    catch ( const QgsCsException &cse )
    {
      QgsMessageLog::logMessage( u"Error transforming extent for layer %1: %2"_s.arg( ml->name() ).arg( cse.what() ), u"Server"_s, Qgis::MessageLevel::Warning );
      return false;
    }
  }
  else
  {
    pLayer.wgs84BoundingRect = ml->wgs84Extent();
  }
 
  try
  {
    pLayer.crsExtents = QgsWmsLayerInfos::transformExtentToCrsList( layerExtent, ml->crs(), outputCrsList, project->transformContext() );
  }
  catch ( QgsCsException &cse )
  {
    QgsMessageLog::logMessage( u"Error transforming extent for layer %1: %2"_s.arg( ml->name() ).arg( cse.what() ), u"Server"_s, Qgis::MessageLevel::Warning );
    return false;
  }
 
  return true;
}
 
// ===================================
// Get wms layer infos
// ===================================
QMap<QString, QgsWmsLayerInfos> QgsWmsLayerInfos::buildWmsLayerInfos( QgsServerInterface *serverIface, const QgsProject *project, const QList<QgsCoordinateReferenceSystem> &outputCrsList )
{
  QMap<QString, QgsWmsLayerInfos> wmsLayers;
#ifdef HAVE_SERVER_PYTHON_PLUGINS
  QgsAccessControl *accessControl = serverIface->accessControls();
#else
  ( void ) serverIface;
#endif
 
  bool useLayerIds = QgsServerProjectUtils::wmsUseLayerIds( *project );
  const QStringList restrictedLayers = QgsServerProjectUtils::wmsRestrictedLayers( *project );
  const QgsRectangle wmsExtent = QgsServerProjectUtils::wmsExtent( *project );
  const QgsCoordinateReferenceSystem wgs84 = QgsCoordinateReferenceSystem::fromOgcWmsCrs( Qgis::geographicCrsAuthId() );
 
  for ( QgsMapLayer *ml : project->mapLayers() )
  {
    if ( !ml || restrictedLayers.contains( ml->name() ) ) //unpublished layer
    {
      continue;
    }
 
#ifdef HAVE_SERVER_PYTHON_PLUGINS
    if ( accessControl && !accessControl->layerReadPermission( ml ) )
    {
      continue;
    }
#endif
 
    QgsWmsLayerInfos pLayer;
    pLayer.id = ml->id();
 
    // Calculate layer extents for the WMS output CRSes list
    // First define if the layer has an extent
    // Vector layer with No Geometry has no extent the other has one
    bool hasExtent = true;
    if ( ml->type() == Qgis::LayerType::Vector )
    {
      QgsVectorLayer *vLayer = qobject_cast<QgsVectorLayer *>( ml );
      if ( !vLayer || vLayer->wkbType() == Qgis::WkbType::NoGeometry )
      {
        hasExtent = false;
      }
    }
 
    // If the layer has an extent and we cannot get CRS bounding boxes, do not keep the layer
    if ( hasExtent && !setBoundingRect( project, pLayer, ml, wmsExtent, wgs84, outputCrsList ) )
      continue;
 
    // layer type
    pLayer.type = ml->type();
    // layer wms name
    pLayer.name = ml->name();
    if ( useLayerIds )
    {
      pLayer.name = ml->id();
    }
    else if ( !ml->serverProperties()->shortName().isEmpty() )
    {
      pLayer.name = ml->serverProperties()->shortName();
    }
    // layer is queryable
    pLayer.queryable = ml->flags().testFlag( QgsMapLayer::Identifiable );
    // layer styles
    pLayer.styles = ml->styleManager()->styles();
    // layer legend URL
    pLayer.legendUrl = ml->serverProperties()->legendUrl();
    // layer legend URL format
    pLayer.legendUrlFormat = ml->serverProperties()->legendUrlFormat();
    // layer min/max scales
    if ( ml->hasScaleBasedVisibility() )
    {
      pLayer.hasScaleBasedVisibility = ml->hasScaleBasedVisibility();
      pLayer.maxScale = ml->maximumScale();
      pLayer.minScale = ml->minimumScale();
    }
 
    wmsLayers[pLayer.id] = pLayer;
  }
 
  return wmsLayers;
}