com.hivemq.extensions.packets.disconnect.ModifiableInboundDisconnectPacketImpl Maven / Gradle / Ivy

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/*
 * Copyright 2019-present HiveMQ GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.hivemq.extensions.packets.disconnect;

import com.google.common.base.Preconditions;
import com.hivemq.configuration.service.FullConfigurationService;
import com.hivemq.extension.sdk.api.annotations.NotNull;
import com.hivemq.extension.sdk.api.annotations.Nullable;
import com.hivemq.extension.sdk.api.annotations.ThreadSafe;
import com.hivemq.extension.sdk.api.packets.disconnect.DisconnectReasonCode;
import com.hivemq.extension.sdk.api.packets.disconnect.ModifiableInboundDisconnectPacket;
import com.hivemq.extensions.packets.general.ModifiableUserPropertiesImpl;
import com.hivemq.extensions.services.builder.PluginBuilderUtil;
import com.hivemq.mqtt.message.disconnect.DISCONNECT;
import com.hivemq.mqtt.message.reason.Mqtt5DisconnectReasonCode;

import java.util.Objects;
import java.util.Optional;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;

/**
 * @author Robin Atherton
 * @author Silvio Giebl
 */
@ThreadSafe
public class ModifiableInboundDisconnectPacketImpl implements ModifiableInboundDisconnectPacket {

    private @NotNull DisconnectReasonCode reasonCode;
    private @Nullable String reasonString;
    private long sessionExpiryInterval;
    private final @Nullable String serverReference;
    private final @NotNull ModifiableUserPropertiesImpl userProperties;

    private final @NotNull FullConfigurationService configurationService;
    private final long originalSessionExpiryInterval;
    private boolean modified = false;

    public ModifiableInboundDisconnectPacketImpl(
            final @NotNull DisconnectPacketImpl packet,
            final @NotNull FullConfigurationService configurationService,
            final long originalSessionExpiryInterval) {

        reasonCode = packet.reasonCode;
        reasonString = packet.reasonString;
        sessionExpiryInterval = packet.sessionExpiryInterval;
        serverReference = packet.serverReference;
        userProperties = new ModifiableUserPropertiesImpl(packet.userProperties.asInternalList(),
                configurationService.securityConfiguration().validateUTF8());

        this.configurationService = configurationService;
        this.originalSessionExpiryInterval = originalSessionExpiryInterval;
    }

    @Override
    public @NotNull DisconnectReasonCode getReasonCode() {
        return reasonCode;
    }

    @Override
    public void setReasonCode(final @NotNull DisconnectReasonCode reasonCode) {
        Preconditions.checkNotNull(reasonCode, "Reason code must never be null");
        Preconditions.checkArgument(reasonCode != DisconnectReasonCode.CLIENT_IDENTIFIER_NOT_VALID,
                "Reason code %s must not be used for disconnect packets.",
                reasonCode);
        Preconditions.checkArgument(Mqtt5DisconnectReasonCode.from(reasonCode).canBeSentByClient(),
                "Reason code %s must not be used for inbound disconnect packets from a client to the server.",
                reasonCode);
        if (Objects.equals(this.reasonCode, reasonCode)) {
            return;
        }
        this.reasonCode = reasonCode;
        modified = true;
    }

    @Override
    public @NotNull Optional getReasonString() {
        return Optional.ofNullable(reasonString);
    }

    @Override
    public void setReasonString(final @Nullable String reasonString) {
        PluginBuilderUtil.checkReasonString(reasonString, configurationService.securityConfiguration().validateUTF8());
        if (Objects.equals(this.reasonString, reasonString)) {
            return;
        }
        this.reasonString = reasonString;
        modified = true;
    }

    @Override
    public @NotNull Optional getSessionExpiryInterval() {
        return (sessionExpiryInterval == DISCONNECT.SESSION_EXPIRY_NOT_SET) ?
                Optional.empty() :
                Optional.of(sessionExpiryInterval);
    }

    @Override
    public void setSessionExpiryInterval(final @Nullable Long sessionExpiryInterval) {
        final long interval;
        if (sessionExpiryInterval == null) {
            interval = DISCONNECT.SESSION_EXPIRY_NOT_SET;
        } else {
            interval = sessionExpiryInterval;
            checkArgument(interval >= 0, "Session expiry interval must be greater than 0");
            final long configuredMaximum = configurationService.mqttConfiguration().maxSessionExpiryInterval();
            checkArgument(interval < configuredMaximum,
                    "Session expiry interval must not be greater than the configured maximum of " + configuredMaximum);
            if (interval > 0) {
                checkState(originalSessionExpiryInterval != 0,
                        "Session expiry interval must not be set when a client connected with session expiry interval = '0'");
            }
        }
        if (this.sessionExpiryInterval == interval) {
            return;
        }
        this.sessionExpiryInterval = interval;
        modified = true;
    }

    @Override
    public @NotNull Optional getServerReference() {
        return Optional.ofNullable(serverReference);
    }

    @Override
    public @NotNull ModifiableUserPropertiesImpl getUserProperties() {
        return userProperties;
    }

    public boolean isModified() {
        return modified || userProperties.isModified();
    }

    public @NotNull DisconnectPacketImpl copy() {
        return new DisconnectPacketImpl(reasonCode,
                reasonString,
                sessionExpiryInterval,
                serverReference,
                userProperties.copy());
    }

    public @NotNull ModifiableInboundDisconnectPacketImpl update(final @NotNull DisconnectPacketImpl packet) {
        return new ModifiableInboundDisconnectPacketImpl(packet, configurationService, originalSessionExpiryInterval);
    }
}