content: /*
   * 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.cassandra.auth;
  
  import java.util.*;
  import java.util.stream.Collectors;
  
  import com.google.common.collect.Sets;
  
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.exceptions.RequestExecutionException;
  import org.apache.cassandra.exceptions.RequestValidationException;
  import org.apache.cassandra.utils.Pair;
  
  public class StubAuthorizer implements IAuthorizer
  {
      Map<Pair<String, IResource>, Set<Permission>> userPermissions = new HashMap<>();
  
      public void clear()
      {
          userPermissions.clear();
      }
  
      public Set<Permission> authorize(AuthenticatedUser user, IResource resource)
      {
          Pair<String, IResource> key = Pair.create(user.getName(), resource);
          Set<Permission> perms = userPermissions.get(key);
          return perms != null ? perms : Collections.emptySet();
      }
  
      public Set<Permission> grant(AuthenticatedUser performer,
                                   Set<Permission> permissions,
                                   IResource resource,
                                   RoleResource grantee) throws RequestValidationException, RequestExecutionException
      {
          Pair<String, IResource> key = Pair.create(grantee.getRoleName(), resource);
          Set<Permission> oldPermissions = userPermissions.computeIfAbsent(key, k -> Collections.emptySet());
          Set<Permission> nonExisting = Sets.difference(permissions, oldPermissions);
  
          if (!nonExisting.isEmpty())
              userPermissions.put(key, Sets.union(oldPermissions, nonExisting));
  
          return nonExisting;
      }
  
      public Set<Permission> revoke(AuthenticatedUser performer,
                                    Set<Permission> permissions,
                                    IResource resource,
                                    RoleResource revokee) throws RequestValidationException, RequestExecutionException
      {
          Pair<String, IResource> key = Pair.create(revokee.getRoleName(), resource);
          Set<Permission> oldPermissions = userPermissions.computeIfAbsent(key, k -> Collections.emptySet());
          Set<Permission> existing = Sets.intersection(permissions, oldPermissions);
  
          if (existing.isEmpty())
              userPermissions.remove(key);
          else
              userPermissions.put(key, Sets.difference(oldPermissions, existing));
  
          return existing;
      }
  
      public Set<PermissionDetails> list(AuthenticatedUser performer,
                                         Set<Permission> permissions,
                                         IResource resource,
                                         RoleResource grantee) throws RequestValidationException, RequestExecutionException
      {
          return userPermissions.entrySet()
                                .stream()
                                .filter(entry -> entry.getKey().left.equals(grantee.getRoleName())
                                                 && (resource == null || entry.getKey().right.equals(resource)))
                                .flatMap(entry -> entry.getValue()
                                                       .stream()
                                                       .filter(permissions::contains)
                                                       .map(p -> new PermissionDetails(entry.getKey().left,
                                                                                       entry.getKey().right,
                                                                                       p)))
                                .collect(Collectors.toSet());
  
      }
  
      public void revokeAllFrom(RoleResource revokee)
      {
          for (Pair<String, IResource> key : userPermissions.keySet())
              if (key.left.equals(revokee.getRoleName()))
                  userPermissions.remove(key);
      }
  
      public void revokeAllOn(IResource droppedResource)
      {
          for (Pair<String, IResource> key : userPermissions.keySet())
              if (key.right.equals(droppedResource))
                  userPermissions.remove(key);
      }
  
      public Set<? extends IResource> protectedResources()
      {
          return Collections.emptySet();
      }
  
      public void validateConfiguration() throws ConfigurationException
      {
      }
  
      public void setup()
      {
      }
  }
  