/**
 * 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.hadoop.hdfs.nfs.nfs3;

import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.DFSTestUtil;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.nfs.conf.NfsConfiguration;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.nfs.nfs3.FileHandle;
import org.apache.hadoop.nfs.nfs3.Nfs3Status;
import org.apache.hadoop.nfs.nfs3.response.REMOVE3Response;
import org.apache.hadoop.oncrpc.XDR;
import org.apache.hadoop.oncrpc.security.SecurityHandler;
import org.apache.hadoop.security.authorize.DefaultImpersonationProvider;
import org.apache.hadoop.security.authorize.ProxyUsers;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.mockito.Mockito;

public class TestClientAccessPrivilege {
  static MiniDFSCluster cluster = null;
  static NfsConfiguration config = new NfsConfiguration();
  static DistributedFileSystem hdfs;
  static NameNode nn;
  static String testdir = "/tmp";
  static SecurityHandler securityHandler;

  @BeforeClass
  public static void setup() throws Exception {

    String currentUser = System.getProperty("user.name");
    config.set(DefaultImpersonationProvider.getTestProvider()
        .getProxySuperuserGroupConfKey(currentUser), "*");
    config.set(DefaultImpersonationProvider.getTestProvider()
        .getProxySuperuserIpConfKey(currentUser), "*");
    ProxyUsers.refreshSuperUserGroupsConfiguration(config);
    cluster = new MiniDFSCluster.Builder(config).numDataNodes(1).build();
    cluster.waitActive();
    hdfs = cluster.getFileSystem();
    nn = cluster.getNameNode();

    // Use ephemeral port in case tests are running in parallel
    config.setInt("nfs3.mountd.port", 0);
    config.setInt("nfs3.server.port", 0);

    securityHandler = Mockito.mock(SecurityHandler.class);
    Mockito.when(securityHandler.getUser()).thenReturn(
        System.getProperty("user.name"));
  }

  @AfterClass
  public static void shutdown() throws Exception {
    if (cluster != null) {
      cluster.shutdown();
    }
  }

  @Before
  public void createFiles() throws IllegalArgumentException, IOException {
    hdfs.delete(new Path(testdir), true);
    hdfs.mkdirs(new Path(testdir));
    DFSTestUtil.createFile(hdfs, new Path(testdir + "/f1"), 0, (short) 1, 0);
  }

  @Test(timeout = 60000)
  public void testClientAccessPrivilegeForRemove() throws Exception {
    // Configure ro access for nfs1 service
    config.set("dfs.nfs.exports.allowed.hosts", "* ro");

    // Start nfs
    Nfs3 nfs = new Nfs3(config);
    nfs.startServiceInternal(false);

    RpcProgramNfs3 nfsd = (RpcProgramNfs3) nfs.getRpcProgram();

    // Create a remove request
    HdfsFileStatus status = nn.getRpcServer().getFileInfo(testdir);
    long dirId = status.getFileId();

    XDR xdr_req = new XDR();
    FileHandle handle = new FileHandle(dirId);
    handle.serialize(xdr_req);
    xdr_req.writeString("f1");

    // Remove operation
    REMOVE3Response response = nfsd.remove(xdr_req.asReadOnlyWrap(),
        securityHandler, new InetSocketAddress("localhost", 1234));

    // Assert on return code
    assertEquals("Incorrect return code", Nfs3Status.NFS3ERR_ACCES,
        response.getStatus());

  }

}