NotificationStatusHandlerMethodArgumentResolver.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * 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 org.springframework.cloud.aws.messaging.endpoint;

import com.amazonaws.services.sns.AmazonSNS;
import com.fasterxml.jackson.databind.JsonNode;
import org.springframework.core.MethodParameter;
import org.springframework.http.HttpInputMessage;

/**
 * @author Agim Emruli
 */
public class NotificationStatusHandlerMethodArgumentResolver extends AbstractNotificationMessageHandlerMethodArgumentResolver {

    private final AmazonSNS amazonSns;

    public NotificationStatusHandlerMethodArgumentResolver(AmazonSNS amazonSns) {
        this.amazonSns = amazonSns;
    }

    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return NotificationStatus.class.isAssignableFrom(parameter.getParameterType());
    }

    @Override
    protected Object doResolveArgumentFromNotificationMessage(JsonNode content, HttpInputMessage request, Class<?> parameterType) {
        if (!"SubscriptionConfirmation".equals(content.get("Type").asText()) && !"UnsubscribeConfirmation".equals(content.get("Type").asText())) {
            throw new IllegalArgumentException("NotificationStatus is only available for subscription and unsubscription requests");
        }
        return new AmazonSnsNotificationStatus(this.amazonSns, content.get("TopicArn").asText(), content.get("Token").asText());
    }

    private static class AmazonSnsNotificationStatus implements NotificationStatus {

        private final AmazonSNS amazonSns;
        private final String topicArn;
        private final String confirmationToken;

        private AmazonSnsNotificationStatus(AmazonSNS amazonSns, String topicArn, String confirmationToken) {
            this.amazonSns = amazonSns;
            this.topicArn = topicArn;
            this.confirmationToken = confirmationToken;
        }

        @Override
        public void confirmSubscription() {
            this.amazonSns.confirmSubscription(this.topicArn, this.confirmationToken);
        }

    }
}