Add resource to return the plugin configuration

Author: bernd

src/main/java/org/graylog/plugins/usagestatistics/UsageStatsConfigurationResponse.java

@@ -0,0 +1,32 @@
+/**
+ * Copyright (C) 2015 Graylog, Inc. ([email protected])
+ *
+ * Licensed 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.graylog.plugins.usagestatistics;
+
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.google.auto.value.AutoValue;
+
+@JsonAutoDetect
+@AutoValue
+public abstract class UsageStatsConfigurationResponse {
+    @JsonProperty("enabled")
+    public abstract boolean isEnabled();
+
+    public static UsageStatsConfigurationResponse create(@JsonProperty("enabled") boolean isEnabled) {
+        return new AutoValue_UsageStatsConfigurationResponse(isEnabled);
+    }
+}

src/main/java/org/graylog/plugins/usagestatistics/UsageStatsResource.java

@@ -38,12 +38,24 @@
 public class UsageStatsResource extends RestResource implements PluginRestResource {
     private final UsageStatsNodeService usageStatsNodeService;
     private final UsageStatsClusterService usageStatsClusterService;
+    private final UsageStatsConfiguration configuration;
 
     @Inject
     public UsageStatsResource(UsageStatsNodeService usageStatsNodeService,
-                              UsageStatsClusterService usageStatsClusterService) {
+                              UsageStatsClusterService usageStatsClusterService,
+                              UsageStatsConfiguration configuration) {
         this.usageStatsNodeService = usageStatsNodeService;
         this.usageStatsClusterService = usageStatsClusterService;
+        this.configuration = configuration;
+    }
+
+    @GET
+    @Path("config")
+    @Timed
+    @ApiOperation(value = "Show configuration for the anonymous usage statistics plugin")
+    @Produces(MediaType.APPLICATION_JSON)
+    public UsageStatsConfigurationResponse showConfig() {
+        return UsageStatsConfigurationResponse.create(configuration.isEnabled());
     }
 
     @GET