Github user trixpan commented on a diff in the pull request:
https://github.com/apache/nifi/pull/483#discussion_r70157622
--- Diff:
nifi-nar-bundles/nifi-email-bundle/nifi-email-processors/src/main/java/org/apache/nifi/processors/email/ExtractEmailHeaders.java
---
@@ -0,0 +1,233 @@
+/*
+ * 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 org.apache.commons.lang3.ArrayUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.mail.util.MimeMessageParser;
+import org.apache.nifi.annotation.behavior.EventDriven;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.InputRequirement.Requirement;
+import org.apache.nifi.annotation.behavior.SideEffectFree;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.io.InputStreamCallback;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.stream.io.BufferedInputStream;
+
+import javax.mail.Address;
+import javax.mail.Header;
+import javax.mail.Message;
+import javax.mail.MessagingException;
+import javax.mail.Session;
+import javax.mail.internet.MimeMessage;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Array;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Date;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+
+
+@EventDriven
+@SideEffectFree
+@Tags({"split", "email"})
+@InputRequirement(Requirement.INPUT_REQUIRED)
+@CapabilityDescription("Using the flowfile content as source of data,
extract header from an RFC compliant email file adding the relevant
attributes to the flowfile. " +
+ "This processor does not perform extensive RFC validation but
still requires a bare minimum compliance with RFC 2822")
+@WritesAttributes({
+ @WritesAttribute(attribute = "email.headers.bcc.*", description =
"Each individual BCC recipient (if available)"),
+ @WritesAttribute(attribute = "email.headers.cc.*", description =
"Each individual CC recipient (if available)"),
+ @WritesAttribute(attribute = "email.headers.from.*", description =
"Each individual mailbox contained in the From of the Email (array as per
RFC-2822)"),
+ @WritesAttribute(attribute = "email.headers.message-id",
description = "The value of the Message-ID header (if available)"),
+ @WritesAttribute(attribute = "email.headers.received_date",
description = "The Received-Date of the message (if available)"),
+ @WritesAttribute(attribute = "email.headers.sent_date",
description = "Date the message was sent"),
+ @WritesAttribute(attribute = "email.headers.subject", description
= "Subject of the message (if available)"),
+ @WritesAttribute(attribute = "email.headers.to.*", description =
"Each individual TO recipient (if available)"),
+ @WritesAttribute(attribute = "email.attachment_count", description
= "Number of attachments of the message" )})
+
+public class ExtractEmailHeaders extends AbstractProcessor {
+ public static final String EMAIL_HEADER_BCC = "email.headers.bcc";
+ public static final String EMAIL_HEADER_CC = "email.headers.cc";
+ public static final String EMAIL_HEADER_FROM = "email.headers.from";
+ public static final String EMAIL_HEADER_MESSAGE_ID =
"email.headers.message-id";
+ public static final String EMAIL_HEADER_RECV_DATE =
"email.headers.received_date";
+ public static final String EMAIL_HEADER_SENT_DATE =
"email.headers.sent_date";
+ public static final String EMAIL_HEADER_SUBJECT =
"email.headers.subject";
+ public static final String EMAIL_HEADER_TO = "email.headers.to";
+ public static final String EMAIL_ATTACHMENT_COUNT =
"email.attachment_count";
+
+ public static final PropertyDescriptor CAPTURED_HEADERS = new
PropertyDescriptor.Builder()
+ .name("Header List")
+ .description("COLON separated list of headers to be extracted
from the flowfile content. " +
+ "NOTE the header key is case insensitive and will be
matched as lower-case." +
+ " Values will respect email contents.")
+ .required(false)
+ .expressionLanguageSupported(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .defaultValue("x-mailer")
+ .build();
+
+ public static final Relationship REL_SUCCESS = new
Relationship.Builder()
+ .name("success")
+ .description("Extraction was successful")
+ .build();
+ public static final Relationship REL_FAILURE = new
Relationship.Builder()
+ .name("failure")
+ .description("Flowfiles that could not be parsed as a RFC-2822
compliant message")
+ .build();
+
+ private Set<Relationship> relationships;
+ private List<PropertyDescriptor> descriptors;
+
+ @Override
+ protected void init(final ProcessorInitializationContext context) {
+ final Set<Relationship> relationships = new HashSet<>();
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+ this.relationships = Collections.unmodifiableSet(relationships);
+
+ final List<PropertyDescriptor> descriptors = new ArrayList<>();
+
+ descriptors.add(CAPTURED_HEADERS);
+ this.descriptors = Collections.unmodifiableList(descriptors);
+ }
+
+ @Override
+ public void onTrigger(final ProcessContext context, final
ProcessSession session) {
+ final ComponentLog logger = getLogger();
+
+ final List<FlowFile> invalidFlowFilesList = new ArrayList<>();
+ final List<FlowFile> processedFlowFilesList = new ArrayList<>();
+
+ final FlowFile originalFlowFile = session.get();
+ if (originalFlowFile == null) {
+ return;
+ }
+
+ final List<String> capturedHeadersList =
Arrays.asList(context.getProperty(CAPTURED_HEADERS).getValue().toLowerCase().split(":"));
+
+ final Map<String, String> attributes = new HashMap<>();
+ session.read(originalFlowFile, new InputStreamCallback() {
+ @Override
+ public void process(final InputStream rawIn) throws
IOException {
+ try (final InputStream in = new
BufferedInputStream(rawIn)) {
+ Properties props = new Properties();
+ Session mailSession =
Session.getDefaultInstance(props, null);
+ MimeMessage originalMessage = new
MimeMessage(mailSession, in);
+ MimeMessageParser parser = new
MimeMessageParser(originalMessage).parse();
+ // RFC-2822 determines that a message must have a
"From:" header
+ // if a message lacks the field, it is flagged as
invalid
+ Address[] from = originalMessage.getFrom();
+ Date sentDate = originalMessage.getSentDate();
+ if (from == null || sentDate == null ) {
+ // See ya later my friend...
--- End diff --
addressed
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