org.attribyte.api.pubsub.impl.Notifier.java Source code

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Here is the source code for org.attribyte.api.pubsub.impl.Notifier.java

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/*
 * Copyright 2010, 2014 Attribyte, LLC
 * 
 * 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.attribyte.api.pubsub.impl;

import com.codahale.metrics.Timer;
import com.google.common.base.Strings;
import com.google.protobuf.ByteString;
import org.attribyte.api.http.RequestBuilder;
import org.attribyte.api.pubsub.*;
import org.attribyte.util.StringUtil;

import java.security.SignatureException;

/**
 * The standard notifier implementation.
 */
public abstract class Notifier extends org.attribyte.api.pubsub.Notifier {

    protected Notifier(final Notification notification, final HubEndpoint hub,
            final SubscriptionCache subscriptionCache, final SubscriberCache subscriberCache,
            final Timer broadcastTimer) {
        super(notification, hub);
        this.subscriptionCache = subscriptionCache;
        this.subscriberCache = subscriberCache;
        this.broadcastTimer = broadcastTimer;
    }

    /**
     * Adds the optional signature.
     * @param builder The request builder.
     * @param notificationContent The notification content.
     * @param subscription The subscription.
     */
    protected static void addSignature(final RequestBuilder builder, final ByteString notificationContent,
            final Subscription subscription) {
        if (!Strings.isNullOrEmpty(subscription.getSecret()) && notificationContent != null) {
            try {
                String hmacSignature = HMACUtil.hexHMAC(notificationContent.toByteArray(),
                        subscription.getSecret());
                builder.addHeader("X-Hub-Signature", "sha1=" + hmacSignature);
            } catch (SignatureException se) {
                builder.addHeader("X-Hub-Signature", "sha1=");
            }
        }
    }

    protected final Timer broadcastTimer;
    protected final SubscriptionCache subscriptionCache;
    protected final SubscriberCache subscriberCache;
    protected final long receiveTimestampNanos = System.nanoTime();
}