exceptionfactory commented on code in PR #6375:
URL: https://github.com/apache/nifi/pull/6375#discussion_r965958209
##########
c2/c2-client-bundle/c2-client-service/src/main/java/org/apache/nifi/c2/client/service/C2HeartbeatFactory.java:
##########
@@ -62,6 +69,12 @@ public class C2HeartbeatFactory {
public C2HeartbeatFactory(C2ClientConfig clientConfig, FlowIdHolder
flowIdHolder) {
this.clientConfig = clientConfig;
this.flowIdHolder = flowIdHolder;
+
+ try {
+ messageDigest = MessageDigest.getInstance("SHA-512");
Review Comment:
Good choice of SHA-512.
##########
c2/c2-client-bundle/c2-client-service/src/main/java/org/apache/nifi/c2/client/service/C2HeartbeatFactory.java:
##########
@@ -225,4 +242,14 @@ private File getConfDirectory() {
return confDirectory;
}
+
+ public String calculateManifestHash(List<Bundle> loadedBundles) {
+ byte[] bytes = messageDigest.digest(loadedBundles.stream()
Review Comment:
Although this specific use of `MessageDigest.digest(byte[] bytes)` should be
safe, other reuse of the `MessageDigest` instance is not safe. It would be
better to construct a new instance of `MessageDigest` for each invocation of
`calculateManifestHash`.
##########
c2/c2-client-bundle/c2-client-service/src/main/java/org/apache/nifi/c2/client/service/C2HeartbeatFactory.java:
##########
@@ -225,4 +242,14 @@ private File getConfDirectory() {
return confDirectory;
}
+
+ public String calculateManifestHash(List<Bundle> loadedBundles) {
+ byte[] bytes = messageDigest.digest(loadedBundles.stream()
+ .map(bundle -> bundle.getGroup() + bundle.getArtifact() +
bundle.getVersion())
+ .sorted()
+ .collect(Collectors.joining(","))
+ .getBytes(StandardCharsets.UTF_8));
+
+ return UUID.nameUUIDFromBytes(bytes).toString();
Review Comment:
The `UUID.nameUUIDFromBytes()` leverages MD5 hashing internally, which
effectively reduces precision of the SHA-512 hash. It would be better to use
hexadecimal encoding of the SHA-512 digest bytes.
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