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https://issues.apache.org/jira/browse/NIFI-5147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16529662#comment-16529662
]
ASF GitHub Bot commented on NIFI-5147:
--------------------------------------
Github user MikeThomsen commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2802#discussion_r199447258
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/CalculateAttributeHash.java
---
@@ -0,0 +1,199 @@
+/*
+ * 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 org.apache.commons.codec.binary.Hex;
+import org.apache.commons.codec.digest.DigestUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.nifi.annotation.behavior.DynamicProperty;
+import org.apache.nifi.annotation.behavior.EventDriven;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+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.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.AllowableValue;
+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.util.StandardValidators;
+
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import java.util.concurrent.atomic.AtomicReference;
+
+@EventDriven
+@SideEffectFree
+@SupportsBatching
+@Tags({"attributes", "hash"})
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@CapabilityDescription("Calculates a hash value for the value specified
attributes and write it to an output attribute. Please refer to
https://csrc.nist.gov/Projects/Hash-Functions/NIST-Policy-on-Hash-Functions
help decide on which algorithm to use.")
+@WritesAttribute(attribute = "<Specified Attribute Name per Dynamic
Property>", description = "This Processor adds an attribute whose value is the
result of "
--- End diff --
I read the Jira ticket and it makes sense.
> Improve HashAttribute processor
> -------------------------------
>
> Key: NIFI-5147
> URL: https://issues.apache.org/jira/browse/NIFI-5147
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Affects Versions: 1.6.0
> Reporter: Andy LoPresto
> Assignee: Otto Fowler
> Priority: Major
> Labels: hash, security
>
> The {{HashAttribute}} processor currently has surprising behavior. Barring
> familiarity with the processor, a user would expect {{HashAttribute}} to
> generate a hash value over one or more attributes. Instead, the processor as
> it is implemented "groups" incoming flowfiles into groups based on regular
> expressions which match attribute values, and then generates a
> (non-configurable) MD5 hash over the concatenation of the matching attribute
> keys and values.
> In addition:
> * the processor throws an error and routes to failure any incoming flowfile
> which does not have all attributes specified in the processor
> * the use of MD5 is vastly deprecated
> * no other hash algorithms are available
> I am unaware of community use of this processor, but I do not want to break
> backward compatibility. I propose the following steps:
> * Implement a new {{CalculateAttributeHash}} processor (awkward name, but
> this processor already has the desired name)
> ** This processor will perform the "standard" use case -- identify an
> attribute, calculate the specified hash over the value, and write it to an
> output attribute
> ** This processor will have a required property descriptor allowing a
> dropdown menu of valid hash algorithms
> ** This processor will accept arbitrary dynamic properties identifying the
> attributes to be hashed as a key, and the resulting attribute name as a value
> ** Example: I want to generate a SHA-512 hash on the attribute {{username}},
> and a flowfile enters the processor with {{username}} value {{alopresto}}. I
> configure {{algorithm}} with {{SHA-512}} and add a dynamic property
> {{username}} -- {{username_SHA512}}. The resulting flowfile will have
> attribute {{username_SHA512}} with value
> {{739b4f6722fb5de20125751c7a1a358b2a7eb8f07e530e4bf18561fbff93234908aa9d2577770c876bca9ede5ba784d5ce6081dbbdfe5ddd446678f223b8d632}}
> * Improve the documentation of this processor to explain the goal/expected
> use case (?)
> * Link in processor documentation to new processor for standard use cases
> * Remove the error alert when an incoming flowfile does not contain all
> expected attributes. I propose changing the severity to INFO and still
> routing to failure
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