Github user olegz commented on a diff in the pull request:
https://github.com/apache/nifi/pull/710#discussion_r71975044
--- Diff:
nifi-nar-bundles/nifi-email-bundle/nifi-email-processors/src/main/java/org/apache/nifi/processors/email/AbstractEmailProcessor.java
---
@@ -0,0 +1,391 @@
+/*
+ * 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;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map.Entry;
+import java.util.Properties;
+import java.util.Set;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+import javax.mail.Address;
+import javax.mail.Message;
+import javax.mail.MessagingException;
+
+import org.apache.nifi.annotation.lifecycle.OnStopped;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.io.OutputStreamCallback;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.support.StaticListableBeanFactory;
+import org.springframework.integration.mail.AbstractMailReceiver;
+import org.springframework.util.Assert;
+import org.springframework.util.StreamUtils;
+
+/**
+ * Base processor for implementing processors to consume messages from
Email
+ * servers using Spring Integration libraries.
+ *
+ * @param <T>
+ * the type of {@link AbstractMailReceiver}.
+ */
+abstract class AbstractEmailProcessor<T extends AbstractMailReceiver>
extends AbstractProcessor {
+
+ public static final PropertyDescriptor HOST = new
PropertyDescriptor.Builder()
+ .name("Host Name")
+ .description("Network address of Email server (e.g.,
pop.gmail.com, imap.gmail.com . . .)")
+ .required(true)
+ .expressionLanguageSupported(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor PORT = new
PropertyDescriptor.Builder()
+ .name("Port")
+ .description("Numeric value identifying Port of Email server
(e.g., 993)")
+ .required(true)
+ .expressionLanguageSupported(true)
+ .addValidator(StandardValidators.PORT_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor USER = new
PropertyDescriptor.Builder()
+ .name("User Name")
+ .description("User Name used for authentication and
authorization with Email server.")
+ .required(true)
+ .expressionLanguageSupported(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor PASSWORD = new
PropertyDescriptor.Builder()
+ .name("Password")
+ .description("Password used for authentication and
authorization with Email server.")
+ .required(true)
+ .expressionLanguageSupported(true)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .sensitive(true)
+ .build();
+ public static final PropertyDescriptor FOLDER = new
PropertyDescriptor.Builder()
+ .name("Folder")
+ .description("Email folder to retrieve messages from (e.g.,
INBOX)")
+ .required(true)
+ .expressionLanguageSupported(true)
+ .defaultValue("INBOX")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor FETCH_SIZE = new
PropertyDescriptor.Builder()
+ .name("Fetch Size")
+ .description("Specify the maximum number of Messages to fetch
per call to Email Server.")
+ .required(true)
+ .expressionLanguageSupported(true)
+ .defaultValue("10")
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor SHOULD_DELETE_MESSAGES = new
PropertyDescriptor.Builder()
+ .name("Delete Messages")
+ .description("Specify whether mail messages should be deleted
after retrieval.")
+ .required(true)
+ .allowableValues("true", "false")
+ .defaultValue("false")
+ .addValidator(StandardValidators.BOOLEAN_VALIDATOR)
+ .build();
+
+ static final Relationship REL_SUCCESS = new Relationship.Builder()
+ .name("success")
+ .description("All messages that are the are successfully
received from Email server and converted to FlowFiles are routed to this
relationship")
+ .build();
+
+ static List<PropertyDescriptor> SHARED_DESCRIPTORS = new ArrayList<>();
+
+ static Set<Relationship> SHARED_RELATIONSHIPS = new HashSet<>();
+
+ /*
+ * Will ensure that list of PropertyDescriptors is build only once,
since
+ * all other lifecycle methods are invoked multiple times.
+ */
+ static {
+ SHARED_DESCRIPTORS.add(HOST);
+ SHARED_DESCRIPTORS.add(PORT);
+ SHARED_DESCRIPTORS.add(USER);
+ SHARED_DESCRIPTORS.add(PASSWORD);
+ SHARED_DESCRIPTORS.add(FOLDER);
+ SHARED_DESCRIPTORS.add(FETCH_SIZE);
+ SHARED_DESCRIPTORS.add(SHOULD_DELETE_MESSAGES);
--- End diff --
This as well as other ideas that I have could be nice features for the
future, so please do raise JIRA for that.
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