com.dalabs.droop.util.password.CredentialProviderPasswordLoader.java Source code

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Here is the source code for com.dalabs.droop.util.password.CredentialProviderPasswordLoader.java

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/**
 * 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 com.dalabs.droop.util.password;

import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

/**
 * A password loader that loads an credential provider alias.
 * The alias is  resolved using the Hadoop credential provider facilitity
 * if available.
 */
public class CredentialProviderPasswordLoader extends FilePasswordLoader {
    public static final Log LOG = LogFactory.getLog(CredentialProviderPasswordLoader.class.getName());

    /**
     * If credential provider is available (made available as part of 2.6.0 and
     * 3.0, then use the credential provider to get the password. Else throw an
     * exception saying this provider is not available.
     */
    @Override
    public String loadPassword(String p, Configuration configuration) throws IOException {
        if (!CredentialProviderHelper.isProviderAvailable()) {
            throw new IOException("CredentialProvider facility not available " + "in the hadoop environment used");
        }
        LOG.debug("Fetching alias from the specified path: " + p);
        Path path = new Path(p);
        FileSystem fs = path.getFileSystem(configuration);

        // Not closing FileSystem object because of SQOOP-1226
        verifyPath(fs, path);
        String alias = new String(readBytes(fs, path));
        String pass = CredentialProviderHelper.resolveAlias(configuration, alias);
        return pass;
    }
}