[
https://issues.apache.org/jira/browse/METRON-539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16083019#comment-16083019
]
ASF GitHub Bot commented on METRON-539:
---------------------------------------
Github user ottobackwards commented on a diff in the pull request:
https://github.com/apache/metron/pull/641#discussion_r126812613
--- Diff:
metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/dsl/functions/HashFunctions.java
---
@@ -0,0 +1,85 @@
+/*
+ * 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.metron.stellar.dsl.functions;
+
+import com.google.common.io.BaseEncoding;
+import org.apache.commons.lang3.SerializationUtils;
+import org.apache.metron.stellar.dsl.BaseStellarFunction;
+import org.apache.metron.stellar.dsl.Stellar;
+
+import java.io.Serializable;
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.List;
+
+public class HashFunctions {
+ @Stellar(
+ name = "HASH",
+ description = "Hashes a given value using the given hashing algorithm
and returns a hex encoded string. This function only hashes " +
+ "strings and values that implement java.io.Serializable.",
+ params = {
+ "toHash - value to hash.",
+ "hashType - A valid string representation of an algorithm supported
by java.security.MessageDigest.",
+ },
+ returns = "A hex representation of a hashed value using the given
hashing algorithm. If either argument is " +
+ "null then null will be returned. If the type of 'toHash' is neither
a string nor of type java.io.Serializable, " +
+ "then null is returned."
+ )
+ public static class Hash extends BaseStellarFunction {
+
+ @Override
+ public Object apply(final List<Object> args) {
+ if (args == null || args.size() != 2) {
+ throw new IllegalArgumentException("Invalid number of arguments: "
+ (args == null ? 0 : args.size()));
+ }
+
+ final Object toHash = args.get(0);
+ final Object hashType = args.get(1);
+
+ if (toHash == null || hashType == null) {
+ return null;
+ }
+
+ final MessageDigest messageDigest =
getMessageDigest(hashType.toString());
+
+ if (toHash instanceof String) {
+ return getHashAsHex(messageDigest,
toHash.toString().getBytes(StandardCharsets.UTF_8));
+ } else if (toHash instanceof Serializable) {
+ final byte[] serialized =
SerializationUtils.serialize((Serializable) toHash);
+ return getHashAsHex(messageDigest, serialized);
+ }
+
+ return null;
+ }
+
+ private MessageDigest getMessageDigest(String hashType) {
--- End diff --
Then again, I don't usually think of using the Stellar static classes on
their own, or from 'other' stellar functions, maybe I'm not thinking of that
correctly
> Add stellar keywords for hashing
> --------------------------------
>
> Key: METRON-539
> URL: https://issues.apache.org/jira/browse/METRON-539
> Project: Metron
> Issue Type: Improvement
> Reporter: Jon Zeolla
> Priority: Minor
>
> Stellar should have the ability to natively hash values using a prefix of TO
> or HASH, then the algorithm, and an optional length. For instance,
> "TO_SHA3_256" or "HASH_MD5."
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
