Added a standard mechanism for customizing the AccessController on a

PlaceObject. Created a default AccessController that is slightly more strict
than the CrowdServer-wide default in that it only allows place occupants to
subscribe to a PlaceObject (a motivated and resourceful player could otherwise
listen in on place chat everywhere in the game if they so desired; with a
custom client, of course).


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4079 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/crowd/server/CrowdObjectAccess.java

@@ -21,6 +21,7 @@
 
 package com.threerings.crowd.server;
 
+import com.threerings.presents.data.ClientObject;
 import com.threerings.presents.dobj.AccessController;
 import com.threerings.presents.dobj.DEvent;
 import com.threerings.presents.dobj.DObject;
@@ -31,6 +32,7 @@ import com.threerings.presents.dobj.Subscriber;
 
 import com.threerings.crowd.Log;
 import com.threerings.crowd.data.BodyObject;
+import com.threerings.crowd.data.PlaceObject;
 
 /**
  * Defines the various object access controllers used by the Crowd server.
@@ -103,4 +105,28 @@ public class CrowdObjectAccess
             }
         }
     };
+
+    /**
+     * Provides access control for place objects. The default behavior is to
+     * allow place occupants to subscribe to the place object and to use the
+     * {@link #DEFAULT} modification policy.
+     */
+    public static AccessController PLACE = new AccessController()
+    {
+        // documentation inherited from interface
+        public boolean allowSubscribe (DObject object, Subscriber sub)
+        {
+            if (sub instanceof CrowdClient) {
+                ClientObject co = ((CrowdClient)sub).getClientObject();
+                return ((PlaceObject)object).occupants.contains(co.getOid());
+            }
+            return true;
+        }
+
+        // documentation inherited from interface
+        public boolean allowDispatch (DObject object, DEvent event)
+        {
+            return DEFAULT.allowDispatch(object, event);
+        }
+    };
 }