Github user revans2 commented on a diff in the pull request:

    https://github.com/apache/storm/pull/2752#discussion_r206238030
  
    --- Diff: 
storm-webapp/src/main/java/org/apache/storm/daemon/ui/filters/AuthorizedUserFilter.java
 ---
    @@ -0,0 +1,130 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF 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.apache.storm.daemon.ui.filters;
    +
    +import java.io.IOException;
    +import java.net.InetAddress;
    +import java.security.Principal;
    +import java.util.Map;
    +import javax.ws.rs.container.ContainerRequestContext;
    +import javax.ws.rs.container.ContainerRequestFilter;
    +import javax.ws.rs.container.ResourceInfo;
    +import javax.ws.rs.core.Context;
    +import javax.ws.rs.ext.Provider;
    +
    +import org.apache.storm.DaemonConfig;
    +import org.apache.storm.daemon.StormCommon;
    +import org.apache.storm.daemon.ui.resources.NimbusOp;
    +import org.apache.storm.security.auth.IAuthorizer;
    +import org.apache.storm.security.auth.ReqContext;
    +import org.apache.storm.thrift.TException;
    +import org.apache.storm.utils.NimbusClient;
    +import org.apache.storm.utils.Utils;
    +import org.json.simple.JSONValue;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +@Provider
    +public class AuthorizedUserFilter implements ContainerRequestFilter {
    +
    +    public static final Logger LOG = 
LoggerFactory.getLogger(AuthorizedUserFilter.class);
    +    public static Map<String, Object> conf = Utils.readStormConfig();
    +    public static IAuthorizer uiImpersonationHandler;
    +    public static IAuthorizer uiAclHandler;
    +
    +    @Context private ResourceInfo resourceInfo;
    +
    +    static {
    +        try {
    +            uiImpersonationHandler = StormCommon.mkAuthorizationHandler(
    +                        (String) 
conf.get(DaemonConfig.NIMBUS_IMPERSONATION_AUTHORIZER), conf);
    +            uiAclHandler = StormCommon.mkAuthorizationHandler(
    +                    (String) conf.get(DaemonConfig.NIMBUS_AUTHORIZER), 
conf);
    +        } catch (IllegalAccessException | InstantiationException | 
ClassNotFoundException e) {
    +            LOG.error("Error initializing AuthorizedUserFilter: ", e);
    +            throw new RuntimeException(e);
    +        }
    +    }
    +
    +    @Override
    +    public void filter(ContainerRequestContext containerRequestContext) 
throws IOException {
    +        NimbusOp annotation = 
resourceInfo.getResourceMethod().getAnnotation(NimbusOp.class);
    +        if (annotation == null) {
    +            return;
    +        }
    +        String op = annotation.value();
    +        if (op == null) {
    +            return;
    +        }
    +
    +        Map topoConf = null;
    +        if 
(containerRequestContext.getUriInfo().getPathParameters().containsKey("id")) {
    --- End diff --
    
    It feels a bit like `?id=` is always the topology id is a bit of magic. 
Could we have a follow on JIRA to make it so each API can configure it, perhaps 
through the annotation?


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