XMLQtInterface.cpp

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#include "XMLQtInterface.h"
 
#include <QByteArray>
#include <QCoreApplication>
#include <QCryptographicHash>
#include <QDir>
#include <QFileInfo>
#include <QXmlSchema>
#include <QXmlSchemaValidator>
#include <QXmlStreamReader>
#include <fstream>
#include <utility>
 
#include "BaseLib/Logging.h"
 
namespace BaseLib
{
namespace IO
{
XMLQtInterface::XMLQtInterface(QString schemaFile)
    : schemaFile_(std::move(schemaFile))
{
}
 
int XMLQtInterface::readFile(const QString& fileName)
{
    fileName_ = fileName;
    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        ERR("XMLQtInterface::readFile(): Can't open xml-file {:s}.",
            fileName.toStdString());
        return 0;
    }
    fileData_ = file.readAll();
    file.close();
 
    if (!checkHash())
    {
        return 0;
    }
 
    return 1;
}
 
int XMLQtInterface::isValid() const
{
    QXmlSchema schema;
    if (schemaFile_.length() > 0)
    {
        auto path =
            QDir(QCoreApplication::applicationDirPath()).filePath(schemaFile_);
        auto url = QUrl::fromLocalFile(path);
        schema.load(url);
    }
    if (schema.isValid())
    {
        QXmlSchemaValidator validator(schema);
        if (validator.validate(fileData_))
        {
            return 1;
        }
 
        INFO(
            "XMLQtInterface::isValid(): XML file {:s} is invalid (in reference "
            "to schema {:s}).",
            fileName_.toStdString(), schemaFile_.toStdString());
    }
    else
    {
        // The following validator (without constructor arguments) automatically
        // searches for the xsd given in the xml file.
        QXmlSchemaValidator validator;
        if (validator.validate(fileData_))
        {
            return 1;
        }
 
        INFO(
            "XMLQtInterface::isValid(): XML file {:s} is invalid (in reference "
            "to its schema).",
            fileName_.toStdString());
    }
    return 0;
}
 
bool XMLQtInterface::checkHash() const
{
    QString md5FileName(fileName_ + ".md5");
    QByteArray fileHash =
        QCryptographicHash::hash(fileData_, QCryptographicHash::Md5);
 
    QFile file(md5FileName);
    if (file.open(QIODevice::ReadOnly))
    {
        QByteArray referenceHash = file.readAll();
        file.close();
        if (referenceHash == fileHash)
        {
            return true;
        }
        INFO("Hashfile does not match data ... checking file ...");
    }
 
    if (!this->isValid())
    {
        return false;
    }
 
    QFile fileMD5(md5FileName);
    if (fileMD5.open(QIODevice::WriteOnly))
    {
        fileMD5.write(fileHash);
        fileMD5.close();
        INFO("File is valid, hashfile written.");
    }
    else
    {
        WARN("File is valid but could not write hashfile!");
    }
    return true;
}
 
QByteArray const& XMLQtInterface::getContent() const
{
    return fileData_;
}
}  // namespace IO
}  // namespace BaseLib