/**
 * 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;

import static org.junit.Assert.*;

import java.io.FileNotFoundException;
import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.InvalidPathException;
import org.apache.hadoop.fs.ParentNotDirectoryException;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
import org.apache.hadoop.util.Time;
import org.junit.Test;

/**
 * This class tests that the DFS command mkdirs only creates valid
 * directories, and generally behaves as expected.
 */
public class TestDFSMkdirs {
  private Configuration conf = new HdfsConfiguration();

  private static final String[] NON_CANONICAL_PATHS = new String[] {
      "//test1",
      "/test2/..",
      "/test2//bar",
      "/test2/../test4",
      "/test5/."
  };

  /**
   * Tests mkdirs can create a directory that does not exist and will
   * not create a subdirectory off a file. Regression test for HADOOP-281.
   */
  @Test
  public void testDFSMkdirs() throws IOException {
    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
    FileSystem fileSys = cluster.getFileSystem();
    try {
      // First create a new directory with mkdirs
      Path myPath = new Path("/test/mkdirs");
      assertTrue(fileSys.mkdirs(myPath));
      assertTrue(fileSys.exists(myPath));
      assertTrue(fileSys.mkdirs(myPath));

      // Second, create a file in that directory.
      Path myFile = new Path("/test/mkdirs/myFile");
      DFSTestUtil.writeFile(fileSys, myFile, "hello world");
   
      // Third, use mkdir to create a subdirectory off of that file,
      // and check that it fails.
      Path myIllegalPath = new Path("/test/mkdirs/myFile/subdir");
      Boolean exist = true;
      try {
        fileSys.mkdirs(myIllegalPath);
      } catch (IOException e) {
        exist = false;
      }
      assertFalse(exist);
      assertFalse(fileSys.exists(myIllegalPath));
      fileSys.delete(myFile, true);
    	
    } finally {
      fileSys.close();
      cluster.shutdown();
    }
  }
  
  /**
   * Tests mkdir will not create directory when parent is missing.
   */
  @Test
  public void testMkdir() throws IOException {
    Configuration conf = new HdfsConfiguration();
    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(2).build();
    DistributedFileSystem dfs = (DistributedFileSystem) cluster.getFileSystem();
    try {
      // Create a dir in root dir, should succeed
      assertTrue(dfs.mkdir(new Path("/mkdir-" + Time.now()),
          FsPermission.getDefault()));
      // Create a dir when parent dir exists as a file, should fail
      IOException expectedException = null;
      String filePath = "/mkdir-file-" + Time.now();
      DFSTestUtil.writeFile(dfs, new Path(filePath), "hello world");
      try {
        dfs.mkdir(new Path(filePath + "/mkdir"), FsPermission.getDefault());
      } catch (IOException e) {
        expectedException = e;
      }
      assertTrue("Create a directory when parent dir exists as file using"
          + " mkdir() should throw ParentNotDirectoryException ",
          expectedException != null
              && expectedException instanceof ParentNotDirectoryException);
      // Create a dir in a non-exist directory, should fail
      expectedException = null;
      try {
        dfs.mkdir(new Path("/non-exist/mkdir-" + Time.now()),
            FsPermission.getDefault());
      } catch (IOException e) {
        expectedException = e;
      }
      assertTrue("Create a directory in a non-exist parent dir using"
          + " mkdir() should throw FileNotFoundException ",
          expectedException != null
              && expectedException instanceof FileNotFoundException);
    } finally {
      dfs.close();
      cluster.shutdown();
    }
  }

  /**
   * Regression test for HDFS-3626. Creates a file using a non-canonical path
   * (i.e. with extra slashes between components) and makes sure that the NN
   * rejects it.
   */
  @Test
  public void testMkdirRpcNonCanonicalPath() throws IOException {
    MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
    try {
      NamenodeProtocols nnrpc = cluster.getNameNodeRpc();
      
      for (String pathStr : NON_CANONICAL_PATHS) {
        try {
          nnrpc.mkdirs(pathStr, new FsPermission((short)0755), true);
          fail("Did not fail when called with a non-canonicalized path: "
             + pathStr);
        } catch (InvalidPathException ipe) {
          // expected
        }
      }
    } finally {
      cluster.shutdown();
    }
  }
}