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/*    Copyright 2014 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kControl

#include "mongo/util/net/private/ssl_expiration.h"

#include <string>

#include "mongo/util/log.h"
#include "mongo/util/time_support.h"

namespace mongo {

static const auto oneDay = Hours(24);

CertificateExpirationMonitor::CertificateExpirationMonitor(Date_t date)
    : _certExpiration(date), _lastCheckTime(Date_t::now()) {}

std::string CertificateExpirationMonitor::taskName() const {
    return "CertificateExpirationMonitor";
}

void CertificateExpirationMonitor::taskDoWork() {
    const Milliseconds timeSinceLastCheck = Date_t::now() - _lastCheckTime;

    if (timeSinceLastCheck < oneDay)
        return;

    const Date_t now = Date_t::now();
    _lastCheckTime = now;

    if (_certExpiration <= now) {
        // The certificate has expired.
        warning() << "Server certificate is now invalid. It expired on "
                  << dateToISOStringUTC(_certExpiration);
        return;
    }

    const auto remainingValidDuration = _certExpiration - now;

    if (remainingValidDuration <= 30 * oneDay) {
        // The certificate will expire in the next 30 days.
        warning() << "Server certificate will expire on " << dateToISOStringUTC(_certExpiration)
                  << " in " << durationCount<Hours>(remainingValidDuration) / 24 << " days.";
    }
}

}  // namespace mongo