[Monitoring] Stop providing "hkey" addition to license (elastic/x-pack-elasticsearch#4131)

This stops providing the "hkey" (hash) of the license now that the
Monitoring UI no longer uses it (6.3+).

Original commit: elastic/x-pack-elasticsearch@235402fa92

plugin/monitoring/src/main/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDoc.java

@@ -12,7 +12,6 @@ import org.elasticsearch.cluster.node.DiscoveryNode;
 import org.elasticsearch.cluster.node.DiscoveryNodes;
 import org.elasticsearch.common.Nullable;
 import org.elasticsearch.common.collect.MapBuilder;
-import org.elasticsearch.common.hash.MessageDigests;
 import org.elasticsearch.common.xcontent.ToXContent;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.license.License;
@@ -21,7 +20,6 @@ import org.elasticsearch.xpack.core.monitoring.MonitoredSystem;
 import org.elasticsearch.xpack.core.monitoring.exporter.MonitoringDoc;
 
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
@@ -133,7 +131,6 @@ public class ClusterStatsMonitoringDoc extends MonitoringDoc {
                         .map();
                 params = new ToXContent.DelegatingMapParams(extraParams, params);
                 license.toInnerXContent(builder, params);
-                builder.field("hkey", hash(license, getCluster()));
                 if (clusterNeedsTLSEnabled) {
                     builder.field("cluster_needs_tls", true);
                 }
@@ -197,12 +194,4 @@ public class ClusterStatsMonitoringDoc extends MonitoringDoc {
         return temp.toString().hashCode();
     }
 
-    public static String hash(License license, String clusterName) {
-        return hash(license.status().label(), license.uid(), license.type(), String.valueOf(license.expiryDate()), clusterName);
-    }
-
-    public static String hash(String licenseStatus, String licenseUid, String licenseType, String licenseExpiryDate, String clusterUUID) {
-        String toHash = licenseStatus + licenseUid + licenseType + licenseExpiryDate + clusterUUID;
-        return MessageDigests.toHexString(MessageDigests.sha256().digest(toHash.getBytes(StandardCharsets.UTF_8)));
-    }
 }

plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDocTests.java

@@ -22,7 +22,6 @@ import org.elasticsearch.cluster.node.DiscoveryNodes;
 import org.elasticsearch.cluster.routing.ShardRouting;
 import org.elasticsearch.cluster.routing.UnassignedInfo;
 import org.elasticsearch.common.bytes.BytesReference;
-import org.elasticsearch.common.hash.MessageDigests;
 import org.elasticsearch.common.network.NetworkModule;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.transport.BoundTransportAddress;
@@ -51,7 +50,6 @@ import org.elasticsearch.xpack.monitoring.exporter.BaseMonitoringDocTestCase;
 import org.junit.Before;
 
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -188,38 +186,6 @@ public class ClusterStatsMonitoringDocTests extends BaseMonitoringDocTestCase<Cl
         assertThat(ClusterStatsMonitoringDoc.nodesHash(nodes), equalTo(ephemeralIds.toString().hashCode()));
     }
 
-    public void testHash() {
-        assertEquals("cc6628dbcfd052fba57870dc4eed4bc9f5cd5d43b4df46e97867aeb2dd7bd2e8",
-                ClusterStatsMonitoringDoc.hash("licenseStatus", "licenseUid", "licenseType", "licenseExpiryDate", "clusterUUID"));
-    }
-
-    public void testHashWithLicense() {
-        final StringBuilder builder = new StringBuilder();
-
-        final License license = mock(License.class);
-        final License.Status status = randomFrom(License.Status.values());
-        when(license.status()).thenReturn(status);
-        builder.append(status.label());
-
-        final String uuid = randomAlphaOfLength(10);
-        when(license.uid()).thenReturn(uuid);
-        builder.append(uuid);
-
-        final String type = randomAlphaOfLength(10);
-        when(license.type()).thenReturn(type);
-        builder.append(type);
-
-        final long expiryDate = randomNonNegativeLong();
-        when(license.expiryDate()).thenReturn(expiryDate);
-        builder.append(String.valueOf(expiryDate));
-
-        final String cluster = randomAlphaOfLength(5);
-        builder.append(cluster);
-
-        assertEquals(MessageDigests.toHexString(MessageDigests.sha256().digest(builder.toString().getBytes(StandardCharsets.UTF_8))),
-                ClusterStatsMonitoringDoc.hash(license, cluster));
-    }
-
     @Override
     public void testToXContent() throws IOException {
         final ClusterName clusterName = new ClusterName("_cluster_name");
@@ -380,8 +346,7 @@ public class ClusterStatsMonitoringDocTests extends BaseMonitoringDocTestCase<Cl
                     + "\"max_nodes\":2,"
                     + "\"issued_to\":\"customer\","
                     + "\"issuer\":\"elasticsearch\","
-                    + "\"start_date_in_millis\":-1,"
+                    + "\"start_date_in_millis\":-1"
-                    + "\"hkey\":\"e05627254d639cf36346bf99934dc4a4ac9f37bdc9100cee450c10fa6322a6dd\""
                     + (needToEnableTLS ? ",\"cluster_needs_tls\":true" : "")
                   + "},"
                   + "\"cluster_stats\":{"

plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/integration/MonitoringIT.java

@@ -65,7 +65,6 @@ import static org.elasticsearch.common.xcontent.ToXContent.EMPTY_PARAMS;
 import static org.elasticsearch.common.xcontent.support.XContentMapValues.extractValue;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
 import static org.elasticsearch.threadpool.ThreadPool.Names.BULK;
-import static org.elasticsearch.xpack.monitoring.collector.cluster.ClusterStatsMonitoringDoc.hash;
 import static org.elasticsearch.xpack.core.monitoring.exporter.MonitoringTemplateUtils.TEMPLATE_VERSION;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.equalTo;
@@ -336,10 +335,6 @@ public class MonitoringIT extends ESSingleNodeTestCase {
         Boolean clusterNeedsTLS = (Boolean) license.get("cluster_needs_tls");
         assertThat(clusterNeedsTLS, isOneOf(true, null));
 
-        // We basically recompute the hash here
-        assertThat("Hash key should be the same",
-                license.get("hkey"), equalTo(hash(status, uid, type, String.valueOf(expiryDate), (String) source.get("cluster_uuid"))));
-
         final Map<String, Object> clusterStats = (Map<String, Object>) source.get("cluster_stats");
         assertThat(clusterStats, notNullValue());
         assertThat(clusterStats.size(), equalTo(4));