KAFKA-13651; Add audit logging to StandardAuthorizer (apache#12031)

This patch adds audit support through the kafka.authorizer.logger logger to StandardAuthorizer. It
follows the same conventions as AclAuthorizer with a similarly formatted log message. When
logIfAllowed is set in the Action, then the log message is at DEBUG level; otherwise, we log at
trace. When logIfDenied is set, then the log message is at INFO level; otherwise, we again log at
TRACE.

Reviewers: Colin P. McCabe <cmccabe@apache.org>

build.gradle

@@ -1136,6 +1136,8 @@ project(':metadata') {
     compileOnly libs.log4j
     testImplementation libs.junitJupiter
     testImplementation libs.hamcrest
+    testImplementation libs.mockitoCore
+    testImplementation libs.mockitoInline
     testImplementation libs.slf4jlog4j
     testImplementation project(':clients').sourceSets.test.output
     testImplementation project(':raft').sourceSets.test.output

clients/src/main/java/org/apache/kafka/common/resource/ResourcePattern.java

@@ -89,7 +89,7 @@ public ResourcePatternFilter toFilter() {
 
     @Override
     public String toString() {
-        return "ResourcePattern(resourceType=" + resourceType + ", name=" + ((name == null) ? "<any>" : name) + ", patternType=" + patternType + ")";
+        return "ResourcePattern(resourceType=" + resourceType + ", name=" + name + ", patternType=" + patternType + ")";
     }
 
     /**

metadata/src/main/java/org/apache/kafka/metadata/authorizer/StandardAcl.java

@@ -25,6 +25,7 @@
 import org.apache.kafka.common.resource.PatternType;
 import org.apache.kafka.common.resource.ResourcePattern;
 import org.apache.kafka.common.resource.ResourceType;
+import org.apache.kafka.common.security.auth.KafkaPrincipal;
 
 import java.util.Objects;
 
@@ -96,6 +97,17 @@ public String principal() {
         return principal;
     }
 
+    public KafkaPrincipal kafkaPrincipal() {
+        int colonIndex = principal.indexOf(":");
+        if (colonIndex == -1) {
+            throw new IllegalStateException("Could not parse principal from `" + principal + "` " +
+                "(no colon is present separating the principal type from the principal name)");
+        }
+        String principalType = principal.substring(0, colonIndex);
+        String principalName = principal.substring(colonIndex + 1);
+        return new KafkaPrincipal(principalType, principalName);
+    }
+
     public String host() {
         return host;
     }