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/**
* Copyright (c) 2014, Institute of Telematics, Karlsruhe Institute of Technology.
*
* This file is part of the PktAnon project. PktAnon is distributed under 2-clause BSD licence.
* See LICENSE file found in the top-level directory of this distribution.
*/
#include "ConfigSAXParser.h"
//----------------------------------------------------------------
#include <memory>
#include "debug.h"
#include <xercesc/sax2/Attributes.hpp>
#include <xercesc/sax2/SAX2XMLReader.hpp>
#include <xercesc/sax2/XMLReaderFactory.hpp>
#include <xercesc/sax2/DefaultHandler.hpp>
using namespace xercesc;
namespace pktanon
{
class ConfigParserHandler : public xercesc::DefaultHandler
{
public:
virtual ~ConfigParserHandler();
ConfigParserHandler(PktAnonConfig& config);
void startElement (
const XMLCh* const uri,
const XMLCh* const localname,
const XMLCh* const qname,
const xercesc::Attributes& attrs
);
virtual void endElement ( const XMLCh* const uri, const XMLCh* const localname, const XMLCh* const qname );
virtual void characters ( const XMLCh* const chars, const XMLSize_t length );
void fatalError ( const xercesc::SAXParseException& );
private:
PktAnonConfig& config;
std::string last_field_name;
size_t current_element;
std::string param_name;
};
ConfigParserHandler::ConfigParserHandler( PktAnonConfig& config ) :
config ( config )
{ }
ConfigParserHandler::~ConfigParserHandler() = default;
const size_t element_hash_base = 512;
const size_t e_PKTANON_config = 195;
const size_t e_parameters = 439;
const size_t e_param = 51;
const size_t e_anonymizations = 122;
const size_t e_packet = 36;
const size_t e_field = 152;
const size_t e_anon = 184;
void ConfigParserHandler::startElement ( const XMLCh* const uri, const XMLCh* const localname, const XMLCh* const qname, const xercesc::Attributes& attrs )
{
XMLString::lowerCase ( const_cast<XMLCh*> ( localname ) );
size_t element = XMLString::hash ( localname, element_hash_base );
XMLCh* attr_NAME = XMLString::transcode ( "name" );
XMLCh* attr_ANON = XMLString::transcode ( "anon" );
XMLCh* attr_TYPE = XMLString::transcode ( "type" );
current_element = element;
switch ( current_element )
{
case e_PKTANON_config: break;
case e_parameters: break;
case e_param:
{
param_name = XMLString::transcode ( attrs.getValue ( attr_NAME ) );
break;
}
case e_anonymizations: break;
case e_packet:
{
std::string packet_name = XMLString::transcode ( attrs.getValue ( ( XMLSize_t ) 0 ) );
config.add_packet ( std::move ( packet_name ) );
break;
}
case e_field:
{
if ( attrs.getLength() == 1 )
{
std::string field_name = XMLString::transcode ( attrs.getValue ( attr_NAME ) );
last_field_name = field_name;
config.add_field_to_last_added_packet ( std::move ( field_name ) );
}
else
{
std::string field_name;
PktAnonConfig::AnonConfig anon_config;
for ( XMLSize_t j = 0; j < attrs.getLength(); j++ )
{
std::string att1 = XMLString::transcode ( attrs.getLocalName ( ( XMLSize_t ) j ) );
std::string att2 = XMLString::transcode ( attrs.getValue ( ( XMLSize_t ) j ) );
auto* attr_name = attrs.getLocalName ( j );
auto* attr_value = attrs.getValue ( j );
if ( XMLString::compareString ( attr_NAME, attr_name ) == 0 )
{
field_name = std::string ( XMLString::transcode ( attr_value ) );
}
else if ( XMLString::compareString ( attr_ANON, attr_name ) == 0 )
{
config.set_anon_class ( anon_config, std::string ( XMLString::transcode ( attr_value ) ) );
}
else
{
config.add_anon_param ( anon_config, std::string ( XMLString::transcode ( attr_name ) ), std::string ( XMLString::transcode ( attr_value ) ) );
}
}
config.add_field_to_last_added_packet ( std::move ( field_name ), std::move ( anon_config ) );
}
break;
case e_anon:
{
PktAnonConfig::AnonConfig anon_config;
for ( XMLSize_t j = 0; j < attrs.getLength(); j++ )
{
std::string att1 = XMLString::transcode ( attrs.getLocalName ( ( XMLSize_t ) j ) );
std::string att2 = XMLString::transcode ( attrs.getValue ( ( XMLSize_t ) j ) );
auto* attr_name = attrs.getLocalName ( j );
auto* attr_value = attrs.getValue ( j );
if ( XMLString::compareString ( attr_NAME, attr_name ) == 0 )
{
config.set_anon_class ( anon_config, std::string ( XMLString::transcode ( attr_value ) ) );
}
else
{
config.add_anon_param ( anon_config, std::string ( XMLString::transcode ( attr_name ) ), std::string ( XMLString::transcode ( attr_value ) ) );
}
}
config.add_anon_to_field_to_last_added_packet ( last_field_name, std::move ( anon_config ) );
}
break;
default:
char* message = XMLString::transcode ( localname );
PRINT ( "unknown element: " << message << ": " << element );
XMLString::release ( &message );
}
}
}
void ConfigParserHandler::endElement ( const XMLCh* const uri, const XMLCh* const localname, const XMLCh* const qname )
{
current_element = 0;
}
void ConfigParserHandler::characters ( const XMLCh* const chars, const XMLSize_t length )
{
switch ( current_element )
{
case e_param:
{
std::string param_value ( XMLString::transcode ( chars ) );
config.add_global_param ( std::move ( param_name ), std::move ( param_value ) );
}
}
current_element = 0;
}
void ConfigParserHandler::fatalError ( const xercesc::SAXParseException& exception )
{
throw exception;
// char* message = XMLString::transcode(exception.getMessage());
// throw std::runtime_error(std::string("Fatal Error: ") + message + " at line: " + std::to_string(exception.getLineNumber()));
}
//-------------------------------------------------------------------------------------------------------------
// ConfigParser
//-------------------------------------------------------------------------------------------------------------
ConfigSAXParser* ConfigSAXParser::pInstance = new ConfigSAXParser();
ConfigSAXParser::~ConfigSAXParser() = default;
ConfigSAXParser::ConfigSAXParser() {}
void ConfigSAXParser::parseConfigFromFile ( const std::string& filename, pktanon::PktAnonConfig& config )
{
try
{
XMLPlatformUtils::Initialize();
}
catch ( const XMLException& e )
{
char* message = XMLString::transcode ( e.getMessage() );
throw std::runtime_error ( message );
}
std::unique_ptr<SAX2XMLReader> parser = std::unique_ptr<SAX2XMLReader> ( XMLReaderFactory::createXMLReader() );
parser->setFeature ( XMLUni::fgSAX2CoreValidation, true );
parser->setFeature ( XMLUni::fgSAX2CoreNameSpaces, true ); // optional
ConfigParserHandler* config_parser = new ConfigParserHandler(config);
parser->setContentHandler ( config_parser );
parser->setErrorHandler ( config_parser );
try
{
parser->parse ( filename.c_str() );
}
catch ( const XMLException& e )
{
char* message = XMLString::transcode ( e.getMessage() );
throw std::runtime_error ( message );
}
catch ( const SAXParseException& e )
{
char* message = XMLString::transcode ( e.getMessage() );
throw std::runtime_error ( std::string ( "Fatal Error: " ) + message + " at line: " + std::to_string ( e.getLineNumber() ) );
}
catch ( const std::exception& e )
{
throw e;
}
catch ( ... )
{
throw std::runtime_error ( "unexpected exception at parseConfigFromFile" );
}
}
}
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