Github user trixpan commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/785#discussion_r82681523
  
    --- Diff: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ParseCEF.java
 ---
    @@ -0,0 +1,323 @@
    +/*
    + * 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.standard;
    +
    +import com.fasterxml.jackson.core.JsonGenerator;
    +import com.fasterxml.jackson.core.JsonProcessingException;
    +import com.fasterxml.jackson.databind.JsonSerializer;
    +import com.fasterxml.jackson.databind.ObjectMapper;
    +import com.fasterxml.jackson.databind.SerializerProvider;
    +import com.fasterxml.jackson.databind.module.SimpleModule;
    +
    +import com.fasterxml.jackson.databind.node.ObjectNode;
    +import com.fluenda.parcefone.event.CEFHandlingException;
    +import com.fluenda.parcefone.event.CommonEvent;
    +import com.fluenda.parcefone.parser.CEFParser;
    +
    +import com.martiansoftware.macnificent.MacAddress;
    +
    +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.SupportsBatching;
    +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.SeeAlso;
    +import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnScheduled;
    +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.InputStreamCallback;
    +import org.apache.nifi.processor.io.OutputStreamCallback;
    +import org.apache.nifi.processor.util.StandardValidators;
    +import org.apache.nifi.stream.io.BufferedOutputStream;
    +import org.apache.nifi.stream.io.StreamUtils;
    +
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.io.OutputStream;
    +import java.net.InetAddress;
    +import java.text.SimpleDateFormat;
    +import java.time.ZoneId;
    +import java.time.ZonedDateTime;
    +import java.time.format.DateTimeFormatter;
    +import java.util.ArrayList;
    +import java.util.Date;
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Set;
    +import java.util.TimeZone;
    +
    +@EventDriven
    +@SideEffectFree
    +@SupportsBatching
    +@InputRequirement(Requirement.INPUT_REQUIRED)
    +@Tags({"logs", "cef", "attributes", "system", "event", "message"})
    +@CapabilityDescription("Parses the contents of a CEF formatted message and 
adds attributes to the FlowFile for " +
    +        "headers and extensions of the parts of the CEF message.\n" +
    +        "Note: This Processor expects CEF messages WITHOUT the syslog 
headers (i.e. starting at \"CEF:0\"")
    +@WritesAttributes({@WritesAttribute(attribute = "cef.header.version", 
description = "The version of the CEF message."),
    +    @WritesAttribute(attribute = "cef.header.deviceVendor", description = 
"The Device Vendor of the CEF message."),
    +    @WritesAttribute(attribute = "cef.header.deviceProduct", description = 
"The Device Product of the CEF message."),
    +    @WritesAttribute(attribute = "cef.header.deviceVersion", description = 
"The Device Version of the CEF message."),
    +    @WritesAttribute(attribute = "cef.header.deviceEventClassId", 
description = "The Device Event Class ID of the CEF message."),
    +    @WritesAttribute(attribute = "cef.header.name", description = "The 
name of the CEF message."),
    +    @WritesAttribute(attribute = "cef.header.severity", description = "The 
severity of the CEF message."),
    +    @WritesAttribute(attribute = "cef.extension.*", description = "The key 
and value generated by the parsing of the message.")})
    +@SeeAlso({ParseSyslog.class})
    +
    +public class ParseCEF extends AbstractProcessor {
    +
    +    // There should be no date format other than internationally agreed 
formats...
    +    // flowfile-attributes uses Java 8 time to parse data (as Date  
objects are not timezoned)
    +    private final static DateTimeFormatter dateTimeFormatter = 
DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
    +
    +    // for some reason Jackson doesnt seem to be able to use 
DateTieFormater
    +    // so we use a SimpleDateFormat to format within flowfile-content
    +    private final SimpleDateFormat simpleDateFormat = new 
SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
    +
    +
    +    // add a TZ object to be used by flowfile-attribute routine
    +    private String tzId = null;
    +
    +    // Add serializer and mapper
    +    private static final ObjectMapper mapper = new ObjectMapper();
    +
    +    public static final String DESTINATION_CONTENT = "flowfile-content";
    +    public static final String DESTINATION_ATTRIBUTES = 
"flowfile-attribute";
    +    public static final PropertyDescriptor FIELDS_DESTINATION = new 
PropertyDescriptor.Builder()
    +        .name("FIELDS_DESTINATION")
    +        .displayName("Parsed fields destination")
    +        .description(
    +                "Indicates whether the results of the CEF parser are 
written " +
    +                "to the FlowFile content or a FlowFile attribute; if using 
" + DESTINATION_ATTRIBUTES +
    +                "attribute, fields will be populated as attributes. " +
    +                "If set to " + DESTINATION_CONTENT + ", the CEF extension 
field will be converted into " +
    +                "a flat JSON object.")
    +        .required(true)
    +        .allowableValues(DESTINATION_CONTENT, DESTINATION_ATTRIBUTES)
    +        .defaultValue(DESTINATION_CONTENT)
    +        .build();
    +
    +    public static final PropertyDescriptor APPEND_RAW_MESSAGE_TO_JSON = 
new PropertyDescriptor.Builder()
    +            .name("APPEND_RAW_MESSAGE_TO_JSON")
    +            .displayName("Append raw message to JSON")
    +            .description("When using flowfile-content, add the original 
flow content as JSON node _raw, " +
    +                    "ignored otherwise.")
    +            .addValidator(StandardValidators.BOOLEAN_VALIDATOR)
    +            .required(true)
    +            .defaultValue("true")
    +            .build();
    +
    +    public static final String UTC = "UTC";
    +    public static final String LOCAL_TZ = "Local Timezone (system 
Default)";
    +    public static final PropertyDescriptor TIME_REPRESENTATION = new 
PropertyDescriptor.Builder()
    +        .name("TIME_REPRESENTATION")
    +        .displayName("Timezone")
    +        .description("Timezone to be used when representing date fields. 
UTC will convert all " +
    +                "dates to UTC, while Local Timezone will convert them to 
the timezone used by NiFi.")
    +        .allowableValues(UTC, LOCAL_TZ)
    +        .required(true)
    +        .defaultValue(LOCAL_TZ)
    +        .build();
    +
    +    static final Relationship REL_FAILURE = new Relationship.Builder()
    +        .name("failure")
    +        .description("Any FlowFile that could not be parsed as a CEF 
message will be transferred to this Relationship without any attributes being 
added")
    +        .build();
    +    static final Relationship REL_SUCCESS = new Relationship.Builder()
    +        .name("success")
    +        .description("Any FlowFile that is successfully parsed as a CEF 
message will be to this Relationship.")
    +        .build();
    +
    +    @Override
    +    public List<PropertyDescriptor> getSupportedPropertyDescriptors() {
    +        final List<PropertyDescriptor>properties =new ArrayList<>();
    +        properties.add(FIELDS_DESTINATION);
    +        properties.add(APPEND_RAW_MESSAGE_TO_JSON);
    +        properties.add(TIME_REPRESENTATION);
    +        return properties;
    +    }
    +
    +    @Override
    +    public Set<Relationship> getRelationships() {
    +        final Set<Relationship> relationships = new HashSet<>();
    +        relationships.add(REL_FAILURE);
    +        relationships.add(REL_SUCCESS);
    +        return relationships;
    +    }
    +
    +    @OnScheduled
    +    public void OnScheduled(final ProcessContext context) {
    +
    +        // Configure jackson mapper before spawning onTriggers
    +        final SimpleModule module = new SimpleModule()
    +                                        .addSerializer(MacAddress.class, 
new MacAddressToStringSerializer());
    +        this.mapper.registerModule(module);
    +        this.mapper.setDateFormat(this.simpleDateFormat);
    +
    +        switch (context.getProperty(TIME_REPRESENTATION).getValue()) {
    +            case LOCAL_TZ:
    +                // set the mapper TZ to local TZ
    +                this.mapper.setTimeZone(TimeZone.getDefault());
    +                tzId = TimeZone.getDefault().getID();
    +                break;
    +            case UTC:
    +                // set the mapper TZ to local TZ
    +                this.mapper.setTimeZone(TimeZone.getTimeZone(UTC));
    +                tzId = UTC;
    +                break;
    +        }
    +    }
    +
    +    @Override
    +    public void onTrigger(final ProcessContext context, final 
ProcessSession session) throws ProcessException {
    +        FlowFile flowFile = session.get();
    +        if (flowFile == null) {
    +            return;
    +        }
    +
    +        final CEFParser parser = new CEFParser();
    +        final byte[] buffer = new byte[(int) flowFile.getSize()];
    +        session.read(flowFile, new InputStreamCallback() {
    +            @Override
    +            public void process(final InputStream in) throws IOException {
    +                StreamUtils.fillBuffer(in, buffer);
    +            }
    +        });
    +
    +        CommonEvent event;
    +
    +        try {
    +            event = parser.parse(buffer, true);
    +        } catch (Exception e) {
    +            // This should never trigger but adding in here as a fencing 
mechanism to
    +            // address possible ParCEFone bugs.
    +            getLogger().error("Parser returned unexpected Exception {} 
while processing {}; routing to failure", new Object[] {e, flowFile});
    +            session.transfer(flowFile, REL_FAILURE);
    +            return;
    +        }
    +
    +
    +        // ParCEFone returns null every time it cannot parse an
    +        // event, so we test
    +        if (event==null) {
    +            getLogger().error("Failed to parse {} as a CEF message: it 
does not conform to the CEF standard; routing to failure", new Object[] 
{flowFile});
    +            session.transfer(flowFile, REL_FAILURE);
    +            return;
    +        }
    +
    +
    +        try {
    +            final String destination = 
context.getProperty(FIELDS_DESTINATION).getValue();
    +
    +            switch (destination) {
    +                case DESTINATION_ATTRIBUTES:
    +
    +                    final Map<String, String> attributes = new HashMap<>();
    +
    +                    // Process KVs of the Header field
    +                    for (Map.Entry<String, Object> entry : 
event.getHeader().entrySet()) {
    +                        attributes.put("cef.header."+entry.getKey(), 
prettyResult(entry.getValue(), tzId));
    +                    }
    +
    +                    // Process KVs composing the Extension field
    +                    for (Map.Entry<String, Object> entry : 
event.getExtension(true).entrySet()) {
    +                    attributes.put("cef.extension." + entry.getKey(), 
prettyResult(entry.getValue(), tzId));
    +
    +                    flowFile = session.putAllAttributes(flowFile, 
attributes);
    +                    }
    +                    break;
    +
    +                case DESTINATION_CONTENT:
    +
    +                    ObjectNode results = mapper.createObjectNode();
    +
    +                    // Add two JSON objects containing one CEF field each
    +                    results.set("header", 
mapper.valueToTree(event.getHeader()));
    +                    results.set("extension", 
mapper.valueToTree(event.getExtension(true)));
    +
    +                    // Add the original content to original CEF content
    +                    // to the resulting JSON
    +                    if 
(context.getProperty(APPEND_RAW_MESSAGE_TO_JSON).asBoolean()) {
    +                        results.set("_raw", mapper.valueToTree(new 
String(buffer)));
    +                    }
    +
    +                    flowFile = session.write(flowFile, new 
OutputStreamCallback() {
    +                        @Override
    +                        public void process(OutputStream out) throws 
IOException {
    +                            try (OutputStream outputStream = new 
BufferedOutputStream(out)) {
    +                                
outputStream.write(mapper.writeValueAsBytes(results));
    +                            }
    +                        }
    +                    });
    +
    +                    // Update the provenance for good measure
    +                    
session.getProvenanceReporter().modifyContent(flowFile, "Replaced content with 
parsed CEF fields and values");
    --- End diff --
    
    Makes sense


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---

Reply via email to