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/*
 * MIT License
 *
 * Copyright (c) 2017 Kungliga Tekniska högskolan
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package se.kth.iss.ug2server;

import java.time.Duration;
import java.time.Instant;

/**
 * Describes a session key.
 */
public class SessionKey {

    public static final int SESSION_KEY_AGE_MAX = 36;
    private final byte[] key;
    private final long keyVersion;
    private final Instant creationTime;

    public SessionKey(byte[] key, long keyVersion, Instant creationTime) {
        this.key = key;
        this.keyVersion = keyVersion;
        this.creationTime = creationTime;
    }

    public byte[] getKey() {
        return key;
    }

    public long getKeyVersion() {
        return keyVersion;
    }

    public boolean expired() {
        return creationTime.plusSeconds(SESSION_KEY_AGE_MAX).isBefore(Instant.now());
    }

    public long getAge() {
        return Duration.between(creationTime, Instant.now()).toMillis();
    }

    public boolean isOld() {
        return creationTime.plusSeconds(SESSION_KEY_AGE_MAX / 7).isBefore(Instant.now());
    }
}




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