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/**
 * Copyright (c) 2015 Bosch Software Innovations GmbH and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.eclipse.hawkbit.amqp;

import java.time.Duration;
import java.util.Map;

import org.eclipse.hawkbit.api.ArtifactUrlHandler;
import org.eclipse.hawkbit.api.HostnameResolver;
import org.eclipse.hawkbit.cache.DownloadIdCache;
import org.eclipse.hawkbit.dmf.amqp.api.AmqpSettings;
import org.eclipse.hawkbit.repository.ArtifactManagement;
import org.eclipse.hawkbit.repository.ControllerManagement;
import org.eclipse.hawkbit.repository.DeploymentManagement;
import org.eclipse.hawkbit.repository.DistributionSetManagement;
import org.eclipse.hawkbit.repository.EntityFactory;
import org.eclipse.hawkbit.repository.SoftwareModuleManagement;
import org.eclipse.hawkbit.repository.SystemManagement;
import org.eclipse.hawkbit.repository.TargetManagement;
import org.eclipse.hawkbit.repository.TenantConfigurationManagement;
import org.eclipse.hawkbit.security.DdiSecurityProperties;
import org.eclipse.hawkbit.security.SystemSecurityContext;
import org.eclipse.hawkbit.tenancy.TenantAware;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.QueueBuilder;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.listener.ConditionalRejectingErrorHandler;
import org.springframework.amqp.rabbit.listener.RabbitListenerContainerFactory;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.amqp.SimpleRabbitListenerContainerFactoryConfigurer;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.bus.ServiceMatcher;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.PropertySource;
import org.springframework.retry.backoff.ExponentialBackOffPolicy;
import org.springframework.retry.support.RetryTemplate;
import org.springframework.util.ErrorHandler;

import com.google.common.collect.Maps;

/**
 * Spring configuration for AMQP based DMF communication for indirect device
 * integration.
 *
 */
@EnableConfigurationProperties({ AmqpProperties.class, AmqpDeadletterProperties.class })
@ConditionalOnProperty(prefix = "hawkbit.dmf.rabbitmq", name = "enabled", matchIfMissing = true)
@PropertySource("classpath:/hawkbit-dmf-defaults.properties")
public class AmqpConfiguration {

    private static final Logger LOGGER = LoggerFactory.getLogger(AmqpConfiguration.class);

    @Autowired
    private AmqpProperties amqpProperties;

    @Autowired
    private AmqpDeadletterProperties amqpDeadletterProperties;

    @Autowired
    private ConnectionFactory rabbitConnectionFactory;

    @Autowired(required = false)
    private ServiceMatcher serviceMatcher;

    /**
     * Register the bean for the custom error handler.
     *
     * @return custom error handler
     */
    @Bean
    @ConditionalOnMissingBean(ErrorHandler.class)
    public ErrorHandler errorHandler() {
        return new ConditionalRejectingErrorHandler(
                new DelayedRequeueExceptionStrategy(amqpProperties.getRequeueDelay()));
    }

    /**
     * Create a {@link RabbitAdmin} and ignore declaration exceptions.
     * {@link RabbitAdmin#setIgnoreDeclarationExceptions(boolean)}
     *
     * @return the bean
     */
    @Bean
    public RabbitAdmin rabbitAdmin() {
        final RabbitAdmin rabbitAdmin = new RabbitAdmin(rabbitConnectionFactory);
        rabbitAdmin.setIgnoreDeclarationExceptions(true);
        return rabbitAdmin;
    }

    /**
     * @return {@link RabbitTemplate} with automatic retry, published confirms and
     *         {@link Jackson2JsonMessageConverter}.
     */
    @Bean
    public RabbitTemplate rabbitTemplate() {
        final RabbitTemplate rabbitTemplate = new RabbitTemplate(rabbitConnectionFactory);
        rabbitTemplate.setMessageConverter(new Jackson2JsonMessageConverter());

        final RetryTemplate retryTemplate = new RetryTemplate();
        retryTemplate.setBackOffPolicy(new ExponentialBackOffPolicy());
        rabbitTemplate.setRetryTemplate(retryTemplate);

        rabbitTemplate.setConfirmCallback((correlationData, ack, cause) -> {
            if (ack) {
                LOGGER.debug("Message with {} confirmed by broker.", correlationData);
            } else {
                LOGGER.error("Broker is unable to handle message with {} : {}", correlationData, cause);
            }
        });

        return rabbitTemplate;
    }

    /**
     * Create the DMF API receiver queue for retrieving DMF messages.
     *
     * @return the receiver queue
     */
    @Bean
    public Queue dmfReceiverQueue() {
        return new Queue(amqpProperties.getReceiverQueue(), true, false, false,
                amqpDeadletterProperties.getDeadLetterExchangeArgs(amqpProperties.getDeadLetterExchange()));
    }

    /**
     * Create the DMF API receiver queue for authentication requests called by 3rd
     * party artifact storages for download authorization by devices.
     *
     * @return the receiver queue
     */
    @Bean
    public Queue authenticationReceiverQueue() {
        return QueueBuilder.nonDurable(amqpProperties.getAuthenticationReceiverQueue()).autoDelete()
                .withArguments(getTTLMaxArgsAuthenticationQueue()).build();
    }

    /**
     * Create DMF exchange.
     *
     * @return the fanout exchange
     */
    @Bean
    public FanoutExchange dmfSenderExchange() {
        return new FanoutExchange(AmqpSettings.DMF_EXCHANGE);
    }

    /**
     * Create the Binding {@link AmqpConfiguration#dmfReceiverQueue()} to
     * {@link AmqpConfiguration#dmfSenderExchange()}.
     *
     * @return the binding and create the queue and exchange
     */
    @Bean
    public Binding bindDmfSenderExchangeToDmfQueue() {
        return BindingBuilder.bind(dmfReceiverQueue()).to(dmfSenderExchange());
    }

    /**
     * Create authentication exchange.
     *
     * @return the fanout exchange
     */
    @Bean
    public FanoutExchange authenticationExchange() {
        return new FanoutExchange(AmqpSettings.AUTHENTICATION_EXCHANGE, false, true);
    }

    /**
     * Create the Binding {@link AmqpConfiguration#authenticationReceiverQueue()} to
     * {@link AmqpConfiguration#authenticationExchange()}.
     *
     * @return the binding and create the queue and exchange
     */
    @Bean
    public Binding bindAuthenticationSenderExchangeToAuthenticationQueue() {
        return BindingBuilder.bind(authenticationReceiverQueue()).to(authenticationExchange());
    }

    /**
     * Create dead letter queue.
     *
     * @return the queue
     */
    @Bean
    public Queue deadLetterQueue() {
        return amqpDeadletterProperties.createDeadletterQueue(amqpProperties.getDeadLetterQueue());
    }

    /**
     * Create the dead letter fanout exchange.
     *
     * @return the fanout exchange
     */
    @Bean
    public FanoutExchange deadLetterExchange() {
        return new FanoutExchange(amqpProperties.getDeadLetterExchange());
    }

    /**
     * Create the Binding deadLetterQueue to deadLetterExchange.
     *
     * @return the binding
     */
    @Bean
    public Binding bindDeadLetterQueueToDeadLetterExchange() {
        return BindingBuilder.bind(deadLetterQueue()).to(deadLetterExchange());
    }

    /**
     * Create AMQP handler service bean.
     *
     * @param rabbitTemplate
     *            for converting messages
     * @param amqpMessageDispatcherService
     *            to sending events to DMF client
     * @param controllerManagement
     *            for target repo access
     * @param entityFactory
     *            to create entities
     *
     * @return handler service bean
     */
    @Bean
    public AmqpMessageHandlerService amqpMessageHandlerService(final RabbitTemplate rabbitTemplate,
            final AmqpMessageDispatcherService amqpMessageDispatcherService,
            final ControllerManagement controllerManagement, final EntityFactory entityFactory,
            final SystemSecurityContext systemSecurityContext,
            final TenantConfigurationManagement tenantConfigurationManagement) {
        return new AmqpMessageHandlerService(rabbitTemplate, amqpMessageDispatcherService, controllerManagement,
                entityFactory, systemSecurityContext, tenantConfigurationManagement);
    }

    /**
     * Create AMQP handler service bean for authentication messages.
     * 
     * @return handler service bean
     */
    @Bean
    AmqpAuthenticationMessageHandler amqpAuthenticationMessageHandler(final RabbitTemplate rabbitTemplate,
            final AmqpControllerAuthentication authenticationManager, final ArtifactManagement artifactManagement,
            final DownloadIdCache downloadIdCache, final HostnameResolver hostnameResolver,
            final ControllerManagement controllerManagement, final TenantAware tenantAware) {
        return new AmqpAuthenticationMessageHandler(rabbitTemplate, authenticationManager, artifactManagement,
                downloadIdCache, hostnameResolver, controllerManagement, tenantAware);
    }

    /**
     * Create default amqp sender service bean.
     *
     * @return the default amqp sender service bean
     */
    @Bean
    @ConditionalOnMissingBean
    public AmqpMessageSenderService amqpSenderServiceBean() {
        return new DefaultAmqpMessageSenderService(rabbitTemplate());
    }

    /**
     * Create RabbitListenerContainerFactory bean if no listenerContainerFactory
     * bean found
     *
     * @return RabbitListenerContainerFactory bean
     */
    @Bean
    @ConditionalOnMissingBean(name = "listenerContainerFactory")
    public RabbitListenerContainerFactory listenerContainerFactory(
            final SimpleRabbitListenerContainerFactoryConfigurer configurer, final ErrorHandler errorHandler) {
        final ConfigurableRabbitListenerContainerFactory factory = new ConfigurableRabbitListenerContainerFactory(
                amqpProperties.isMissingQueuesFatal(), amqpProperties.getDeclarationRetries(), errorHandler);
        configurer.configure(factory, rabbitConnectionFactory);
        return factory;
    }

    /**
     * create the authentication bean for controller over amqp.
     *
     * @param systemManagement
     *            the systemManagement
     * @param controllerManagement
     *            the controllerManagement
     * @param tenantConfigurationManagement
     *            the tenantConfigurationManagement
     * @param tenantAware
     *            the tenantAware
     * @param ddiSecruityProperties
     *            the ddiSecruityProperties
     * @param systemSecurityContext
     *            the systemSecurityContext
     * @return the bean
     */
    @Bean
    @ConditionalOnMissingBean(AmqpControllerAuthentication.class)
    public AmqpControllerAuthentication amqpControllerAuthentication(final SystemManagement systemManagement,
            final ControllerManagement controllerManagement,
            final TenantConfigurationManagement tenantConfigurationManagement, final TenantAware tenantAware,
            final DdiSecurityProperties ddiSecruityProperties, final SystemSecurityContext systemSecurityContext) {
        return new AmqpControllerAuthentication(systemManagement, controllerManagement, tenantConfigurationManagement,
                tenantAware, ddiSecruityProperties, systemSecurityContext);
    }

    @Bean
    @ConditionalOnMissingBean(AmqpMessageDispatcherService.class)
    AmqpMessageDispatcherService amqpMessageDispatcherService(final RabbitTemplate rabbitTemplate,
            final AmqpMessageSenderService amqpSenderService, final ArtifactUrlHandler artifactUrlHandler,
            final SystemSecurityContext systemSecurityContext, final SystemManagement systemManagement,
            final TargetManagement targetManagement, final DistributionSetManagement distributionSetManagement,
            final SoftwareModuleManagement softwareModuleManagement, final DeploymentManagement deploymentManagement) {
        return new AmqpMessageDispatcherService(rabbitTemplate, amqpSenderService, artifactUrlHandler,
                systemSecurityContext, systemManagement, targetManagement, serviceMatcher, distributionSetManagement,
                softwareModuleManagement, deploymentManagement);
    }

    private static Map getTTLMaxArgsAuthenticationQueue() {
        final Map args = Maps.newHashMapWithExpectedSize(2);
        args.put("x-message-ttl", Duration.ofSeconds(30).toMillis());
        args.put("x-max-length", 1_000);
        return args;
    }

}




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