Stubbing services, adding security context. deduplicating REST resources

More work to share REST controller classes between radio and server.
Therefore we are supplying a special security context that is providing
a special "allow everything" subject and we are stubbing user services.
Moving DTOs used to rest-model module, so it can be used as an API
return type later.
Extracting several semantically associated methods of the SystemResource
to separate resources.

graylog2-bootstrap/src/main/java/org/graylog2/bootstrap/commands/Server.java

@@ -24,7 +24,7 @@
 import io.airlift.airline.Command;
 import io.airlift.airline.Option;
 import org.graylog2.Configuration;
-import org.graylog2.ServerVersion;
+import org.graylog2.shared.ServerVersion;
 import org.graylog2.UI;
 import org.graylog2.bindings.AlarmCallbackBindings;
 import org.graylog2.bindings.InitializerBindings;

graylog2-radio/src/main/java/org/graylog2/radio/bindings/RadioBindings.java

@@ -32,6 +32,7 @@
 import org.graylog2.radio.buffers.processors.RadioProcessBufferProcessor;
 import org.graylog2.radio.inputs.InputStateListener;
 import org.graylog2.radio.inputs.PersistedInputsImpl;
+import org.graylog2.radio.security.RadioSecurityContextFactory;
 import org.graylog2.radio.system.activities.NullActivityWriter;
 import org.graylog2.radio.transports.RadioTransport;
 import org.graylog2.radio.users.NullUserServiceImpl;
@@ -60,8 +61,8 @@ protected void configure() {
         bindSingletons();
         bindTransport();
         bind(ProcessBufferProcessor.class).to(RadioProcessBufferProcessor.class);
-        SecurityContextFactory instance = null;
-        bind(SecurityContextFactory.class).toProvider(Providers.of(instance));
+        //SecurityContextFactory instance = null;
+        //bind(SecurityContextFactory.class).toProvider(Providers.of(instance));
         bindDynamicFeatures();
         bindContainerResponseFilters();
         bindExceptionMappers();
@@ -73,6 +74,7 @@ private void bindInterfaces() {
         bind(ActivityWriter.class).to(NullActivityWriter.class);
         bind(PersistedInputs.class).to(PersistedInputsImpl.class);
         bind(UserService.class).to(NullUserServiceImpl.class);
+        bind(SecurityContextFactory.class).to(RadioSecurityContextFactory.class);
     }
 
     private void bindEventBusListeners() {

graylog2-radio/src/main/java/org/graylog2/radio/inputs/PersistedInputsImpl.java

@@ -35,6 +35,7 @@
 import java.io.IOException;
 import java.util.Iterator;
 import java.util.List;
+import java.util.concurrent.ExecutionException;
 
 public class PersistedInputsImpl implements PersistedInputs {
     private static final Logger LOG = LoggerFactory.getLogger(PersistedInputsImpl.class);
@@ -122,6 +123,22 @@ public boolean add(MessageInput input) {
 
     @Override
     public boolean remove(Object o) {
+        if (o instanceof MessageInput) {
+            final MessageInput messageInput = (MessageInput)o;
+            try {
+                inputService.unregisterInCluster(messageInput);
+            } catch (ExecutionException | InterruptedException | IOException e) {
+                LOG.error("Could not unregister input in Graylog2 cluster: ", e);
+                return false;
+            }
+
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public boolean update(String id, MessageInput newInput) {
         return false;
     }
 }