Github user JPercivall commented on a diff in the pull request:
https://github.com/apache/nifi/pull/483#discussion_r70562091
--- Diff:
nifi-nar-bundles/nifi-email-bundle/nifi-email-processors/src/main/java/org/apache/nifi/processors/email/smtp/handler/SMTPMessageHandlerFactory.java
---
@@ -0,0 +1,147 @@
+/*
+ * 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.email.smtp.handler;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.cert.X509Certificate;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.stream.io.ByteArrayOutputStream;
+import org.apache.nifi.util.StopWatch;
+import org.subethamail.smtp.DropConnectionException;
+import org.subethamail.smtp.MessageContext;
+import org.subethamail.smtp.MessageHandler;
+import org.subethamail.smtp.MessageHandlerFactory;
+import org.subethamail.smtp.RejectException;
+import org.subethamail.smtp.TooMuchDataException;
+import org.subethamail.smtp.server.SMTPServer;
+
+import org.apache.nifi.processors.email.smtp.event.SmtpEvent;
+
+
+public class SMTPMessageHandlerFactory implements MessageHandlerFactory {
+ final LinkedBlockingQueue<SmtpEvent> incomingMessages;
+ final ComponentLog logger;
+
+ public SMTPMessageHandlerFactory(LinkedBlockingQueue<SmtpEvent>
incomingMessages, ComponentLog logger) {
+ this.incomingMessages = incomingMessages;
+ this.logger = logger;
+ }
+
+ @Override
+ public MessageHandler create(MessageContext messageContext) {
+ return new Handler(messageContext, incomingMessages, logger);
+ }
+
+ class Handler implements MessageHandler {
+ final MessageContext messageContext;
+ String from;
+ String recipient;
+ byte [] messageBody;
+
+
+ public Handler(MessageContext messageContext,
LinkedBlockingQueue<SmtpEvent> incomingMessages, ComponentLog logger){
+ this.messageContext = messageContext;
+ }
+
+ @Override
+ public void from(String from) throws RejectException {
+ // TODO: possibly whitelist senders?
+ this.from = from;
+ }
+
+ @Override
+ public void recipient(String recipient) throws RejectException {
+ // TODO: possibly whitelist receivers?
+ this.recipient = recipient;
+ }
+
+ @Override
+ public void data(InputStream inputStream) throws RejectException,
TooMuchDataException, IOException {
+ // Start counting the timer...
+
+ StopWatch watch = new StopWatch(false);
+
+ SMTPServer server = messageContext.getSMTPServer();
+
+ ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+ byte [] buffer = new byte[1024];
+ int rd;
+
+ while ((rd = inputStream.read(buffer, 0, buffer.length)) !=
-1) {
+ baos.write(buffer, 0, rd);
+ }
+ if (baos.getBufferLength() > server.getMaxMessageSize()) {
+ throw new TooMuchDataException("Data exceeds the amount
allowed.");
+ }
+
+ baos.flush();
+ this.messageBody = baos.toByteArray();
+
+
+ X509Certificate[] certificates = new X509Certificate[]{};
+
+ String remoteIP = messageContext.getRemoteAddress().toString();
+ String helo = messageContext.getHelo();
+ if (messageContext.getTlsPeerCertificates() != null ){
+ certificates = (X509Certificate[])
messageContext.getTlsPeerCertificates().clone();
+ }
+
+ SmtpEvent message = new SmtpEvent(remoteIP, helo, from,
recipient, certificates, messageBody);
+ try {
+ // Try to queue the message back to the NiFi session
+ incomingMessages.put(message);
+ } catch (InterruptedException e) {
+ // Throws an error to the incoming server alerting about
issues queuing the message in NiFi
+ logger.error("Hit an error sending message back to NiFi
main thread {}. Sending and error back to SMTP client and discarding message",
new Object [] {e});
+ throw new DropConnectionException(451, "NiFi something
went wrong while processing you message, please retry again later");
+ }
+
+ // Once message has been sent to the queue, it should be
processed by NiFi onTrigger,
+ // a flowfile created and its processed status updated before
an acknowledgment is
+ // given back to the SMTP client
+ try {
+ synchronized(message) {
+ while(! message.getProcessed()) {
+ // Check to see if it is too late...
+ final long serverTimeout =
TimeUnit.NANOSECONDS.convert(messageContext.getSMTPServer().getConnectionTimeout(),
TimeUnit.MILLISECONDS);
+ if ( watch.getElapsed(TimeUnit.MILLISECONDS) <=
serverTimeout) {
+ // Will should allow for a couple of retries;
+
message.wait(messageContext.getSMTPServer().getConnectionTimeout() / 20);
+ } else {
+ logger.error("Did not receive the onTrigger
reponse within the acceptable timeframes");
+ throw new DropConnectionException(451, "The
processing of your message timed-out, we may have received it but you better
off sending it again");
--- End diff --
I don't think this was addressed. There are a number of race-conditions
that could occur, like a server timeout occurring while the onTrigger is still
running.
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