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/*
* Copyright 2020 The Netty Project
*
* The Netty Project licenses this file to you 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:
*
* https://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 org.apache.hbase.thirdparty.io.netty.handler.codec.mqtt;
import org.apache.hbase.thirdparty.io.netty.util.collection.IntObjectHashMap;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.ArrayList;
/**
* MQTT Properties container
* */
public final class MqttProperties {
public enum MqttPropertyType {
// single byte properties
PAYLOAD_FORMAT_INDICATOR(0x01),
REQUEST_PROBLEM_INFORMATION(0x17),
REQUEST_RESPONSE_INFORMATION(0x19),
MAXIMUM_QOS(0x24),
RETAIN_AVAILABLE(0x25),
WILDCARD_SUBSCRIPTION_AVAILABLE(0x28),
SUBSCRIPTION_IDENTIFIER_AVAILABLE(0x29),
SHARED_SUBSCRIPTION_AVAILABLE(0x2A),
// two bytes properties
SERVER_KEEP_ALIVE(0x13),
RECEIVE_MAXIMUM(0x21),
TOPIC_ALIAS_MAXIMUM(0x22),
TOPIC_ALIAS(0x23),
// four bytes properties
PUBLICATION_EXPIRY_INTERVAL(0x02),
SESSION_EXPIRY_INTERVAL(0x11),
WILL_DELAY_INTERVAL(0x18),
MAXIMUM_PACKET_SIZE(0x27),
// Variable Byte Integer
SUBSCRIPTION_IDENTIFIER(0x0B),
// UTF-8 Encoded String properties
CONTENT_TYPE(0x03),
RESPONSE_TOPIC(0x08),
ASSIGNED_CLIENT_IDENTIFIER(0x12),
AUTHENTICATION_METHOD(0x15),
RESPONSE_INFORMATION(0x1A),
SERVER_REFERENCE(0x1C),
REASON_STRING(0x1F),
USER_PROPERTY(0x26),
// Binary Data
CORRELATION_DATA(0x09),
AUTHENTICATION_DATA(0x16);
private static final MqttPropertyType[] VALUES;
static {
VALUES = new MqttPropertyType[43];
for (MqttPropertyType v : values()) {
VALUES[v.value] = v;
}
}
private final int value;
MqttPropertyType(int value) {
this.value = value;
}
public int value() {
return value;
}
public static MqttPropertyType valueOf(int type) {
MqttPropertyType t = null;
try {
t = VALUES[type];
} catch (ArrayIndexOutOfBoundsException ignored) {
// nop
}
if (t == null) {
throw new IllegalArgumentException("unknown property type: " + type);
}
return t;
}
}
public static final MqttProperties NO_PROPERTIES = new MqttProperties(false);
static MqttProperties withEmptyDefaults(MqttProperties properties) {
if (properties == null) {
return MqttProperties.NO_PROPERTIES;
}
return properties;
}
/**
* MQTT property base class
*
* @param property type
*/
public abstract static class MqttProperty {
final T value;
final int propertyId;
protected MqttProperty(int propertyId, T value) {
this.propertyId = propertyId;
this.value = value;
}
/**
* Get MQTT property value
*
* @return property value
*/
public T value() {
return value;
}
/**
* Get MQTT property ID
* @return property ID
*/
public int propertyId() {
return propertyId;
}
@Override
public int hashCode() {
return propertyId + 31 * value.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
MqttProperty that = (MqttProperty) obj;
return this.propertyId == that.propertyId && this.value.equals(that.value);
}
}
public static final class IntegerProperty extends MqttProperty {
public IntegerProperty(int propertyId, Integer value) {
super(propertyId, value);
}
@Override
public String toString() {
return "IntegerProperty(" + propertyId + ", " + value + ")";
}
}
public static final class StringProperty extends MqttProperty {
public StringProperty(int propertyId, String value) {
super(propertyId, value);
}
@Override
public String toString() {
return "StringProperty(" + propertyId + ", " + value + ")";
}
}
public static final class StringPair {
public final String key;
public final String value;
public StringPair(String key, String value) {
this.key = key;
this.value = value;
}
@Override
public int hashCode() {
return key.hashCode() + 31 * value.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
StringPair that = (StringPair) obj;
return that.key.equals(this.key) && that.value.equals(this.value);
}
}
//User properties are the only properties that may be included multiple times and
//are the only properties where ordering is required. Therefore, they need a special handling
public static final class UserProperties extends MqttProperty> {
public UserProperties() {
super(MqttPropertyType.USER_PROPERTY.value, new ArrayList());
}
/**
* Create user properties from the collection of the String pair values
*
* @param values string pairs. Collection entries are copied, collection itself isn't shared
*/
public UserProperties(Collection values) {
this();
this.value.addAll(values);
}
private static UserProperties fromUserPropertyCollection(Collection properties) {
UserProperties userProperties = new UserProperties();
for (UserProperty property: properties) {
userProperties.add(new StringPair(property.value.key, property.value.value));
}
return userProperties;
}
public void add(StringPair pair) {
this.value.add(pair);
}
public void add(String key, String value) {
this.value.add(new StringPair(key, value));
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder("UserProperties(");
boolean first = true;
for (StringPair pair: value) {
if (!first) {
builder.append(", ");
}
builder.append(pair.key + "->" + pair.value);
first = false;
}
builder.append(")");
return builder.toString();
}
}
public static final class UserProperty extends MqttProperty {
public UserProperty(String key, String value) {
super(MqttPropertyType.USER_PROPERTY.value, new StringPair(key, value));
}
@Override
public String toString() {
return "UserProperty(" + value.key + ", " + value.value + ")";
}
}
public static final class BinaryProperty extends MqttProperty {
public BinaryProperty(int propertyId, byte[] value) {
super(propertyId, value);
}
@Override
public String toString() {
return "BinaryProperty(" + propertyId + ", " + value.length + " bytes)";
}
}
public MqttProperties() {
this(true);
}
private MqttProperties(boolean canModify) {
this.canModify = canModify;
}
private IntObjectHashMap props;
private List userProperties;
private List subscriptionIds;
private final boolean canModify;
public void add(MqttProperty property) {
if (!canModify) {
throw new UnsupportedOperationException("adding property isn't allowed");
}
IntObjectHashMap props = this.props;
if (property.propertyId == MqttPropertyType.USER_PROPERTY.value) {
List userProperties = this.userProperties;
if (userProperties == null) {
userProperties = new ArrayList(1);
this.userProperties = userProperties;
}
if (property instanceof UserProperty) {
userProperties.add((UserProperty) property);
} else if (property instanceof UserProperties) {
for (StringPair pair: ((UserProperties) property).value) {
userProperties.add(new UserProperty(pair.key, pair.value));
}
} else {
throw new IllegalArgumentException("User property must be of UserProperty or UserProperties type");
}
} else if (property.propertyId == MqttPropertyType.SUBSCRIPTION_IDENTIFIER.value) {
List subscriptionIds = this.subscriptionIds;
if (subscriptionIds == null) {
subscriptionIds = new ArrayList(1);
this.subscriptionIds = subscriptionIds;
}
if (property instanceof IntegerProperty) {
subscriptionIds.add((IntegerProperty) property);
} else {
throw new IllegalArgumentException("Subscription ID must be an integer property");
}
} else {
if (props == null) {
props = new IntObjectHashMap();
this.props = props;
}
props.put(property.propertyId, property);
}
}
public Collection listAll() {
IntObjectHashMap props = this.props;
if (props == null && subscriptionIds == null && userProperties == null) {
return Collections.emptyList();
}
if (subscriptionIds == null && userProperties == null) {
return props.values();
}
if (props == null && userProperties == null) {
return subscriptionIds;
}
List propValues = new ArrayList(props != null ? props.size() : 1);
if (props != null) {
propValues.addAll(props.values());
}
if (subscriptionIds != null) {
propValues.addAll(subscriptionIds);
}
if (userProperties != null) {
propValues.add(UserProperties.fromUserPropertyCollection(userProperties));
}
return propValues;
}
public boolean isEmpty() {
IntObjectHashMap props = this.props;
return props == null || props.isEmpty();
}
/**
* Get property by ID. If there are multiple properties of this type (can be with Subscription ID)
* then return the first one.
*
* @param propertyId ID of the property
* @return a property if it is set, null otherwise
*/
public MqttProperty getProperty(int propertyId) {
if (propertyId == MqttPropertyType.USER_PROPERTY.value) {
//special handling to keep compatibility with earlier versions
List userProperties = this.userProperties;
if (userProperties == null) {
return null;
}
return UserProperties.fromUserPropertyCollection(userProperties);
}
if (propertyId == MqttPropertyType.SUBSCRIPTION_IDENTIFIER.value) {
List subscriptionIds = this.subscriptionIds;
if (subscriptionIds == null || subscriptionIds.isEmpty()) {
return null;
}
return subscriptionIds.get(0);
}
IntObjectHashMap props = this.props;
return props == null ? null : props.get(propertyId);
}
/**
* Get properties by ID.
* Some properties (Subscription ID and User Properties) may occur multiple times,
* this method returns all their values in order.
*
* @param propertyId ID of the property
* @return all properties having specified ID
*/
public List getProperties(int propertyId) {
if (propertyId == MqttPropertyType.USER_PROPERTY.value) {
return userProperties == null ? Collections.emptyList() : userProperties;
}
if (propertyId == MqttPropertyType.SUBSCRIPTION_IDENTIFIER.value) {
return subscriptionIds == null ? Collections.emptyList() : subscriptionIds;
}
IntObjectHashMap props = this.props;
return (props == null || !props.containsKey(propertyId)) ?
Collections.emptyList() :
Collections.singletonList(props.get(propertyId));
}
}
