/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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
*
* 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.apache.nifi.processors.aws.sns;
import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
import org.apache.nifi.annotation.behavior.InputRequirement;
import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
import org.apache.nifi.annotation.behavior.SupportsBatching;
import org.apache.nifi.annotation.documentation.CapabilityDescription;
import org.apache.nifi.annotation.documentation.SeeAlso;
import org.apache.nifi.annotation.documentation.Tags;
import org.apache.nifi.components.PropertyDescriptor;
import org.apache.nifi.flowfile.FlowFile;
import org.apache.nifi.processor.ProcessContext;
import org.apache.nifi.processor.ProcessSession;
import org.apache.nifi.processor.util.StandardValidators;
import org.apache.nifi.processors.aws.sqs.GetSQS;
import org.apache.nifi.processors.aws.sqs.PutSQS;
import com.amazonaws.services.sns.AmazonSNSClient;
import com.amazonaws.services.sns.model.MessageAttributeValue;
import com.amazonaws.services.sns.model.PublishRequest;
@SupportsBatching
@SeeAlso({GetSQS.class, PutSQS.class})
@InputRequirement(Requirement.INPUT_REQUIRED)
@Tags({"amazon", "aws", "sns", "topic", "put", "publish", "pubsub"})
@CapabilityDescription("Sends the content of a FlowFile as a notification to the Amazon Simple Notification Service")
public class PutSNS extends AbstractSNSProcessor {
public static final PropertyDescriptor CHARACTER_ENCODING = new PropertyDescriptor.Builder()
.name("Character Set")
.description("The character set in which the FlowFile's content is encoded")
.defaultValue("UTF-8")
.expressionLanguageSupported(true)
.addValidator(StandardValidators.CHARACTER_SET_VALIDATOR)
.required(true)
.build();
public static final PropertyDescriptor USE_JSON_STRUCTURE = new PropertyDescriptor.Builder()
.name("Use JSON Structure")
.description("If true, the contents of the FlowFile must be JSON with a top-level element named 'default'."
+ " Additional elements can be used to send different messages to different protocols. See the Amazon"
+ " SNS Documentation for more information.")
.defaultValue("false")
.allowableValues("true", "false")
.required(true)
.build();
public static final PropertyDescriptor SUBJECT = new PropertyDescriptor.Builder()
.name("E-mail Subject")
.description("The optional subject to use for any subscribers that are subscribed via E-mail")
.expressionLanguageSupported(true)
.required(false)
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.build();
public static final List<PropertyDescriptor> properties = Collections.unmodifiableList(
Arrays.asList(ARN, ARN_TYPE, SUBJECT, REGION, ACCESS_KEY, SECRET_KEY, CREDENTIALS_FILE, AWS_CREDENTIALS_PROVIDER_SERVICE, TIMEOUT,
USE_JSON_STRUCTURE, CHARACTER_ENCODING, PROXY_HOST, PROXY_HOST_PORT));
public static final int MAX_SIZE = 256 * 1024;
@Override
protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
return properties;
}
@Override
protected PropertyDescriptor getSupportedDynamicPropertyDescriptor(final String propertyDescriptorName) {
return new PropertyDescriptor.Builder()
.name(propertyDescriptorName)
.addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
.expressionLanguageSupported(true)
.required(false)
.dynamic(true)
.build();
}
@Override
public void onTrigger(final ProcessContext context, final ProcessSession session) {
FlowFile flowFile = session.get();
if (flowFile == null) {
return;
}
if (flowFile.getSize() > MAX_SIZE) {
getLogger().error("Cannot publish {} to SNS because its size exceeds Amazon SNS's limit of 256KB; routing to failure", new Object[]{flowFile});
session.transfer(flowFile, REL_FAILURE);
return;
}
final Charset charset = Charset.forName(context.getProperty(CHARACTER_ENCODING).evaluateAttributeExpressions(flowFile).getValue());
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
session.exportTo(flowFile, baos);
final String message = new String(baos.toByteArray(), charset);
final AmazonSNSClient client = getClient();
final PublishRequest request = new PublishRequest();
request.setMessage(message);
if (context.getProperty(USE_JSON_STRUCTURE).asBoolean()) {
request.setMessageStructure("json");
}
final String arn = context.getProperty(ARN).evaluateAttributeExpressions(flowFile).getValue();
final String arnType = context.getProperty(ARN_TYPE).getValue();
if (arnType.equalsIgnoreCase(ARN_TYPE_TOPIC.getValue())) {
request.setTopicArn(arn);
} else {
request.setTargetArn(arn);
}
final String subject = context.getProperty(SUBJECT).evaluateAttributeExpressions(flowFile).getValue();
if (subject != null) {
request.setSubject(subject);
}
for (final Map.Entry<PropertyDescriptor, String> entry : context.getProperties().entrySet()) {
if (entry.getKey().isDynamic() && !StringUtils.isEmpty(entry.getValue())) {
final MessageAttributeValue value = new MessageAttributeValue();
value.setStringValue(context.getProperty(entry.getKey()).evaluateAttributeExpressions(flowFile).getValue());
value.setDataType("String");
request.addMessageAttributesEntry(entry.getKey().getName(), value);
}
}
try {
client.publish(request);
session.transfer(flowFile, REL_SUCCESS);
session.getProvenanceReporter().send(flowFile, arn);
getLogger().info("Successfully published notification for {}", new Object[]{flowFile});
} catch (final Exception e) {
getLogger().error("Failed to publish Amazon SNS message for {} due to {}", new Object[]{flowFile, e});
flowFile = session.penalize(flowFile);
session.transfer(flowFile, REL_FAILURE);
}
}
}