/* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU GPL (v>=2)
 * and comes with ABSOLUTELY NO WARRANTY!
 * See LICENSE.txt for details.
 */
#include "certificate.h"

#ifdef Q_OS_WIN

#include <QDebug>

Certificate::Certificate(const QByteArray& asn1data) : mValid(false) {

    // asn1data is expected to be \0 terminated as this is what
    // qt does in ::fromBase64 so the actual asn1data is
    // size() - 1 and not size()
    Q_ASSERT (asn1data[asn1data.size()] == '\0');
    DWORD sizeOfName = 0;

    DWORD sizeOfCert = asn1data.size() - 1;

    mPCertContext = CertCreateCertificateContext(X509_ASN_ENCODING,
            (const BYTE *) asn1data.constData(), sizeOfCert);

    if (!mPCertContext) {
        qDebug() << "Error creating certificate context. Err: " <<
            GetLastError();
        return;
    }

    sizeOfName = CertGetNameStringW(pCertContext,
                                    CERT_NAME_FRIENDLY_DISPLAY_TYPE,
                                    0,
                                    NULL,
                                    NULL,
                                    0);

    if (sizeOfName <= 1) {
        // Probably some fallbacks would be nice here? Let's see if this
        // is a problem in testing.
        qDebug() << "Failed to get friendly name. Don't know what to do!";
    } else {
        WCHAR certName[sizeOfName];
        DWORD actSize = CertGetNameStringW(pCertContext,
                                           CERT_NAME_FRIENDLY_DISPLAY_TYPE,
                                           0,
                                           NULL,
                                           certName,
                                           sizeOfName);
        Q_ASSERT (actSize == sizeOfName);

        mShortDescription = QString::fromWCharArray(certName, sizeOfName);
    }

}

Certificate::~Certificate() {
    if (mPCertContext) {
        CertFreeCertificateContext(pCertContext);
    }
}

QString Certificate::shortDescription() {
    if (!isValid()) {
        return QString::fromLatin1(tr("Invalid Certificate"));
    }
    return mShortDescription;
}

#endif