hadoop S3ADtFetcher 源码

  • 2022-10-20
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haddop S3ADtFetcher 代码


 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.hadoop.fs.s3a.auth.delegation;

import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.s3a.Constants;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.DtFetcher;
import org.apache.hadoop.security.token.Token;

 * A DT fetcher for S3A.
 * This is a copy-and-paste of
 * {@code org.apache.hadoop.hdfs.HdfsDtFetcher}.
 * It is only needed for the `hadoop dtutil` command.
public class S3ADtFetcher implements DtFetcher {

  private static final String SERVICE_NAME = Constants.FS_S3A;

  private static final String FETCH_FAILED =
      "Filesystem not generating Delegation Tokens";

   * Returns the service name for HDFS, which is also a valid URL prefix.
  public Text getServiceName() {
    return new Text(SERVICE_NAME);

  public boolean isTokenRequired() {
    return UserGroupInformation.isSecurityEnabled();

   *  Returns Token object via FileSystem, null if bad argument.
   *  @param conf - a Configuration object used with FileSystem.get()
   *  @param creds - a Credentials object to which token(s) will be added
   *  @param renewer  - the renewer to send with the token request
   *  @param url  - the URL to which the request is sent
   *  @return a Token, or null if fetch fails.
  public Token<?> addDelegationTokens(Configuration conf,
      Credentials creds,
      String renewer,
      String url) throws Exception {
    if (!url.startsWith(getServiceName().toString())) {
      url = getServiceName().toString() + "://" + url;
    FileSystem fs = FileSystem.get(URI.create(url), conf);
    Token<?> token = fs.getDelegationToken(renewer);
    if (token == null) {
      throw new DelegationTokenIOException(FETCH_FAILED + ": " + url);
    creds.addToken(token.getService(), token);
    return token;


hadoop 源码目录


hadoop AWSPolicyProvider 源码

hadoop AbstractDTService 源码

hadoop AbstractDelegationTokenBinding 源码

hadoop AbstractS3ATokenIdentifier 源码

hadoop DelegationConstants 源码

hadoop DelegationOperations 源码

hadoop DelegationTokenIOException 源码

hadoop DelegationTokenProvider 源码

hadoop EncryptionSecretOperations 源码

hadoop EncryptionSecrets 源码

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