/*
* Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
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* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
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package thredds.server.wcs.v1_1_0;
import thredds.servlet.ServletUtil;
import thredds.servlet.DatasetHandler;
import thredds.util.TdsPathUtils;
import thredds.wcs.v1_1_0.WcsException;
import thredds.wcs.v1_1_0.GetCapabilities;
import thredds.wcs.v1_1_0.Request;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
import java.io.IOException;
import ucar.nc2.dt.GridDataset;
/**
* Represent the incoming WCS 1.1.0 request.
*
* @author edavis
* @since 4.0
*/
public class WcsRequestParser
{
private static org.slf4j.Logger log =
org.slf4j.LoggerFactory.getLogger( WcsRequestParser.class );
public static Request parseRequest( String version, HttpServletRequest req, HttpServletResponse res )
throws WcsException
{
// These are handled in WcsServlet. Don't need to validate here.
// String serviceParam = ServletUtil.getParameterIgnoreCase( req, "Service" );
// String versionParam = ServletUtil.getParameterIgnoreCase( req, "Version" );
// String acceptVersionsParam = ServletUtil.getParameterIgnoreCase( req, "AcceptVersions" );
// General request info
Request request; // The Request object to be built and returned.
Request.Operation operation;
String datasetPath = TdsPathUtils.extractPath(req, "wcs/");
GridDataset dataset = openDataset( req, res );
// GetCapabilities request info
List<GetCapabilities.Section> sections;
// DescribeCoverage request info
// GetCoverage request info
// Determine the request operation.
String requestParam = ServletUtil.getParameterIgnoreCase( req, "Request" );
try
{
operation = Request.Operation.valueOf( requestParam );
}
catch ( IllegalArgumentException e )
{
throw new WcsException( WcsException.Code.OperationNotSupported, requestParam, "" );
}
// Handle "GetCapabilities" request.
if ( operation.equals( Request.Operation.GetCapabilities ) )
{
String sectionsParam = ServletUtil.getParameterIgnoreCase( req, "Sections" );
// String updateSequenceParam = ServletUtil.getParameterIgnoreCase( req, "UpdateSequence" );
// String acceptFormatsParam = ServletUtil.getParameterIgnoreCase( req, "AcceptFormats" );
if ( sectionsParam != null )
{
String[] sectionArray = sectionsParam.split( "," );
sections = new ArrayList<>( sectionArray.length );
for ( String curSection : sectionArray )
{
sections.add( GetCapabilities.Section.valueOf( curSection ) );
}
}
else
sections = Collections.emptyList();
request = Request.getGetCapabilitiesRequest( operation, version, sections,
datasetPath, dataset );
}
// Handle "DescribeCoverage" request.
else if ( operation.equals( Request.Operation.DescribeCoverage ) )
{
// The "Identifier" parameter is KVP encoded as "Identifiers", handle both.
String identifiers = ServletUtil.getParameterIgnoreCase( req, "Identifiers" );
if ( identifiers == null )
identifiers = ServletUtil.getParameterIgnoreCase( req, "Identifier");
List<String> idList = splitCommaSeperatedList( identifiers );
request = Request.getDescribeCoverageRequest( operation, version, idList, datasetPath, dataset );
}
// Handle "GetCoverage" request.
else if ( operation.equals( Request.Operation.GetCoverage ) )
{
String identifier = ServletUtil.getParameterIgnoreCase( req, "Identifier" );
request = Request.getGetCoverageRequest( operation, version, identifier, datasetPath ,dataset );
}
else
throw new WcsException( WcsException.Code.OperationNotSupported, requestParam, "" );
return request;
}
private static List<String> splitCommaSeperatedList( String identifiers )
{
List<String> idList = new ArrayList<>();
String[] idArray = identifiers.split( ",");
for (String anIdArray : idArray) {
idList.add(anIdArray.trim());
}
return idList;
}
private static GridDataset openDataset( HttpServletRequest req, HttpServletResponse res )
throws WcsException
{
String datasetURL = ServletUtil.getParameterIgnoreCase( req, "dataset" );
boolean isRemote = ( datasetURL != null );
String datasetPath = isRemote ? datasetURL : TdsPathUtils.extractPath(req, "wcs/");
GridDataset dataset;
try
{
dataset = isRemote ? ucar.nc2.dt.grid.GridDataset.open( datasetPath ) : DatasetHandler.openGridDataset( req, res, datasetPath );
}
catch ( IOException e )
{
log.warn( "WcsRequestParser(): Failed to open dataset <" + datasetPath + ">: " + e.getMessage() );
throw new WcsException( WcsException.Code.NoApplicableCode, null, "Failed to open dataset, \"" + datasetPath + "\"." );
}
if ( dataset == null )
{
log.debug( "WcsRequestParser(): Unknown dataset <" + datasetPath + ">." );
throw new WcsException( WcsException.Code.NoApplicableCode, null, "Unknown dataset, \"" + datasetPath + "\"." );
}
return dataset;
}
}