S3 repo plugin populates SettingsFilter (#30652)

The accessKey and secretKey repo settings (in the cluster state)
for the s3 client are registered and will populate the SettingsFilter.

plugins/repository-s3/src/main/java/org/elasticsearch/repositories/s3/S3RepositoryPlugin.java

@@ -90,6 +90,8 @@ public List<Setting<?>> getSettings() {
             S3ClientSettings.PROXY_PASSWORD_SETTING,
             S3ClientSettings.READ_TIMEOUT_SETTING,
             S3ClientSettings.MAX_RETRIES_SETTING,
-            S3ClientSettings.USE_THROTTLE_RETRIES_SETTING);
+            S3ClientSettings.USE_THROTTLE_RETRIES_SETTING,
+            S3Repository.ACCESS_KEY_SETTING,
+            S3Repository.SECRET_KEY_SETTING);
     }
 }

plugins/repository-s3/src/test/java/org/elasticsearch/repositories/s3/S3BlobStoreRepositoryTests.java

@@ -0,0 +1,126 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch 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.elasticsearch.repositories.s3;
+
+import com.amazonaws.services.s3.AmazonS3;
+
+import org.elasticsearch.client.node.NodeClient;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.common.settings.SettingsFilter;
+import org.elasticsearch.common.xcontent.NamedXContentRegistry;
+import org.elasticsearch.env.Environment;
+import org.elasticsearch.plugins.Plugin;
+import org.elasticsearch.repositories.Repository;
+import org.elasticsearch.rest.AbstractRestChannel;
+import org.elasticsearch.rest.RestController;
+import org.elasticsearch.rest.RestRequest;
+import org.elasticsearch.rest.RestResponse;
+import org.elasticsearch.rest.action.admin.cluster.RestGetRepositoriesAction;
+import org.elasticsearch.test.ESIntegTestCase;
+import org.elasticsearch.test.rest.FakeRestRequest;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Locale;
+import java.util.Map;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static java.util.Collections.emptyMap;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.not;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+import static org.mockito.Matchers.any;
+
+public class S3BlobStoreRepositoryTests extends ESIntegTestCase {
+
+    private final String bucket = "bucket_" + randomAlphaOfLength(randomIntBetween(1, 10)).toLowerCase(Locale.ROOT);
+    private final String client = "client_" + randomAlphaOfLength(randomIntBetween(1, 10)).toLowerCase(Locale.ROOT);
+    private final String accessKey = "accessKey_" + randomAlphaOfLength(randomIntBetween(1, 10)).toLowerCase(Locale.ROOT);
+    private final String secureKey = "secureKey_" + randomAlphaOfLength(randomIntBetween(1, 10)).toLowerCase(Locale.ROOT);
+
+    protected void createTestRepository(final String name) {
+        assertAcked(client().admin().cluster().preparePutRepository(name)
+            .setType(S3Repository.TYPE)
+            .setVerify(false)
+            .setSettings(Settings.builder()
+                .put(S3Repository.BUCKET_SETTING.getKey(), bucket)
+                .put(InternalAwsS3Service.CLIENT_NAME.getKey(), client)
+                .put(S3Repository.ACCESS_KEY_SETTING.getKey(), accessKey)
+                .put(S3Repository.SECRET_KEY_SETTING.getKey(), secureKey)));
+    }
+
+    @Override
+    protected Collection<Class<? extends Plugin>> nodePlugins() {
+        return Collections.singletonList(EmptyS3RepositoryPlugin.class);
+    }
+
+    public static class EmptyS3RepositoryPlugin extends S3RepositoryPlugin {
+
+        public EmptyS3RepositoryPlugin(final Settings settings) {
+            super(settings);
+        }
+
+        @Override
+        public Map<String, Repository.Factory> getRepositories(final Environment env, final NamedXContentRegistry registry) {
+            return Collections.singletonMap(S3Repository.TYPE, (metadata) ->
+                new S3Repository(metadata, env.settings(), registry, new InternalAwsS3Service(env.settings(), emptyMap()) {
+                    @Override
+                    public synchronized AmazonS3 client(final Settings repositorySettings) {
+                        final AmazonS3 client = mock(AmazonS3.class);
+                        when(client.doesBucketExist(any(String.class))).thenReturn(true);
+                        return client;
+                    }
+                }));
+        }
+    }
+
+    public void testInsecureRepositoryCredentials() throws Exception {
+        final String repositoryName = "testInsecureRepositoryCredentials";
+        createTestRepository(repositoryName);
+        final NodeClient nodeClient = internalCluster().getInstance(NodeClient.class);
+        final RestGetRepositoriesAction getRepoAction = new RestGetRepositoriesAction(Settings.EMPTY, mock(RestController.class),
+                internalCluster().getInstance(SettingsFilter.class));
+        final RestRequest getRepoRequest = new FakeRestRequest();
+        getRepoRequest.params().put("repository", repositoryName);
+        final CountDownLatch getRepoLatch = new CountDownLatch(1);
+        final AtomicReference<AssertionError> getRepoError = new AtomicReference<>();
+        getRepoAction.handleRequest(getRepoRequest, new AbstractRestChannel(getRepoRequest, true) {
+            @Override
+            public void sendResponse(RestResponse response) {
+                try {
+                    final String responseContent = response.content().utf8ToString();
+                    assertThat(responseContent, containsString(bucket));
+                    assertThat(responseContent, containsString(client));
+                    assertThat(responseContent, not(containsString(accessKey)));
+                    assertThat(responseContent, not(containsString(secureKey)));
+                } catch (final AssertionError ex) {
+                    getRepoError.set(ex);
+                }
+                getRepoLatch.countDown();
+            }
+        }, nodeClient);
+        getRepoLatch.await();
+        if (getRepoError.get() != null) {
+            throw getRepoError.get();
+        }
+    }
+}