qgsserverquerystringparameter.cpp

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/***************************************************************************
  qgsserverquerystringparameter.cpp - QgsServerQueryStringParameter
 
 ---------------------
 begin                : 10.7.2019
 copyright            : (C) 2019 by Alessandro Pasotti
 email                : elpaso at itopen dot it
 ***************************************************************************
 *                                                                         *
 *   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 "qgsserverquerystringparameter.h"
 
#include <nlohmann/json.hpp>
 
#include "qgsserverexception.h"
#include "qgsserverrequest.h"
 
#include <QString>
 
#include "moc_qgsserverquerystringparameter.cpp"
 
using namespace Qt::StringLiterals;
 
QgsServerQueryStringParameter::QgsServerQueryStringParameter( const QString name, bool required, QgsServerQueryStringParameter::Type type, const QString &description, const QVariant &defaultValue )
  : mName( name )
  , mRequired( required )
  , mType( type )
  , mDescription( description )
  , mDefaultValue( defaultValue )
{}
 
QgsServerQueryStringParameter::~QgsServerQueryStringParameter()
{}
 
QVariant QgsServerQueryStringParameter::value( const QgsServerApiContext &context ) const
{
  // Case insensitive check
  const QUrlQuery urlQuery( context.request()->url() );
  const QList<std::pair<QString, QString>> items = urlQuery.queryItems( QUrl::FullyDecoded );
  QString nameInQueryString;
  QVariant value;
  for ( const auto &pair : std::as_const( items ) )
  {
    if ( pair.first.compare( mName, Qt::CaseInsensitive ) == 0 )
    {
      nameInQueryString = pair.first;
      value = pair.second;
      break;
    }
  }
 
  // 1: check required
  if ( mRequired && nameInQueryString.isEmpty() )
  {
    throw QgsServerApiBadRequestException( u"Missing required argument: '%1'"_s.arg( mName ) );
  }
 
  // 2: get value from query string or set it to the default
  if ( nameInQueryString.isEmpty() && mDefaultValue.isValid() )
  {
    value = mDefaultValue;
  }
 
  if ( value.isValid() )
  {
    // 3: check type
    const QMetaType::Type targetType { static_cast<QMetaType::Type>( mType ) };
    // Handle csv list type
    if ( mType == Type::List )
    {
      value = value.toString().split( ',' );
    }
    if ( value.userType() != targetType )
    {
      bool ok = false;
      if ( value.canConvert( static_cast<int>( targetType ) ) )
      {
        ok = true;
        switch ( mType )
        {
          case Type::String:
            value = value.toString();
            break;
          case Type::Boolean:
            value = value.toBool();
            break;
          case Type::Double:
            value = value.toDouble( &ok );
            break;
          case Type::Integer:
            value = value.toLongLong( &ok );
            break;
          case Type::List:
            // already converted to a string list
            break;
        }
      }
 
      if ( !ok )
      {
        throw QgsServerApiBadRequestException( u"Argument '%1' could not be converted to %2"_s.arg( mName, typeName( mType ) ) );
      }
    }
 
    // 4: check custom validation
    if ( mCustomValidator && !mCustomValidator( context, value ) )
    {
      throw QgsServerApiBadRequestException( u"Argument '%1' is not valid. %2"_s.arg( name(), description() ) );
    }
  }
  return value;
}
 
void QgsServerQueryStringParameter::setCustomValidator( const customValidator &customValidator )
{
  mCustomValidator = customValidator;
}
 
json QgsServerQueryStringParameter::data() const
{
  const auto nameString { name().toStdString() };
  auto dataType { typeName( mType ).toLower().toStdString() };
  // Map list to string because it will be serialized
  if ( dataType == "list" )
  {
    dataType = "string";
  }
  else if ( dataType == "double" )
  {
    dataType = "number";
  }
  return {
    { "name", nameString },
    { "description", description().toStdString() },
    { "required", mRequired },
    { "in", "query" },
    { "style", "form" },
    { "explode", false },
    { "schema", { { "type", dataType } } },
    // This is unfortunately not in OAS: { "default", mDefaultValue.toString().toStdString() }
  };
}
 
QString QgsServerQueryStringParameter::description() const
{
  return mDescription;
}
 
QString QgsServerQueryStringParameter::typeName( const QgsServerQueryStringParameter::Type type )
{
  static const QMetaEnum metaEnum = QMetaEnum::fromType<Type>();
  return metaEnum.valueToKey( static_cast<int>( type ) );
}
 
QString QgsServerQueryStringParameter::name() const
{
  return mName;
}
 
void QgsServerQueryStringParameter::setDescription( const QString &description )
{
  mDescription = description;
}
 
bool QgsServerQueryStringParameter::hidden() const
{
  return mHidden;
}
 
void QgsServerQueryStringParameter::setHidden( bool hidden )
{
  mHidden = hidden;
}