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The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use
Java API for communicating with LDAP directory servers and performing
related tasks like reading and writing LDIF, encoding and decoding data
using base64 and ASN.1 BER, and performing secure communication. This
package contains the Standard Edition of the LDAP SDK, which is a
complete, general-purpose library for communicating with LDAPv3 directory
servers.
/*
* Copyright 2016-2022 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright 2016-2022 Ping Identity Corporation
*
* Licensed 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.
*/
/*
* Copyright (C) 2016-2022 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.util;
import java.io.BufferedReader;
import java.io.Closeable;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.text.ParseException;
import java.util.concurrent.atomic.AtomicLong;
import com.unboundid.ldap.sdk.DN;
import com.unboundid.ldap.sdk.LDAPException;
import com.unboundid.ldap.sdk.ResultCode;
import static com.unboundid.util.UtilityMessages.*;
/**
* This class provides a mechanism for reading DNs from a file. The file is
* expected to have one DN per line. Blank lines and lines beginning with the
* octothorpe (#) character will be ignored. Lines may contain just the raw DN,
* or they may start with "dn:" followed by an optional space and the DN, or
* "dn::" followed by an optional space and the base64-encoded representation of
* the DN.
*/
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class DNFileReader
implements Closeable
{
// A counter used to keep track of the line number for information read from
// the file.
@NotNull private final AtomicLong lineNumberCounter;
// The reader to use to read the DNs.
@NotNull private final BufferedReader reader;
// The file from which the DNs are being read.
@NotNull private final File dnFile;
/**
* Creates a new DN file reader that will read from the file with the
* specified path.
*
* @param path The path to the file to be read. It must not be {@code null}
* and the file must exist.
*
* @throws IOException If a problem is encountered while opening the file
* for reading.
*/
public DNFileReader(@NotNull final String path)
throws IOException
{
this(new File(path));
}
/**
* Creates a new DN file reader that will read from the specified file.
*
* @param dnFile The file to be read. It must not be {@code null} and the
* file must exist.
*
* @throws IOException If a problem is encountered while opening the file
* for reading.
*/
public DNFileReader(@NotNull final File dnFile)
throws IOException
{
this.dnFile = dnFile;
reader = new BufferedReader(new FileReader(dnFile));
lineNumberCounter = new AtomicLong(0L);
}
/**
* Reads the next DN from the file.
*
* @return The DN read from the file, or {@code null} if there are no more
* DNs to be read.
*
* @throws IOException If a problem is encountered while trying to read from
* the file.
*
* @throws LDAPException If data read from the file can't be parsed as a DN.
*/
@Nullable()
public DN readDN()
throws IOException, LDAPException
{
while (true)
{
final long lineNumber;
final String line;
synchronized (this)
{
line = reader.readLine();
lineNumber = lineNumberCounter.incrementAndGet();
}
if (line == null)
{
return null;
}
final String trimmedLine = line.trim();
if (trimmedLine.isEmpty() || trimmedLine.startsWith("#"))
{
continue;
}
String dnString = trimmedLine;
if (trimmedLine.charAt(2) == ':')
{
final String lowerLine = StaticUtils.toLowerCase(trimmedLine);
if (lowerLine.startsWith("dn::"))
{
final String base64String = line.substring(4).trim();
try
{
dnString = Base64.decodeToString(base64String);
}
catch (final ParseException pe)
{
Debug.debugException(pe);
throw new LDAPException(ResultCode.DECODING_ERROR,
ERR_DN_FILE_READER_CANNOT_BASE64_DECODE.get(base64String,
lineNumber, dnFile.getAbsolutePath(), pe.getMessage()),
pe);
}
}
else if (lowerLine.startsWith("dn:"))
{
dnString = line.substring(3).trim();
}
}
try
{
return new DN(dnString);
}
catch (final LDAPException le)
{
Debug.debugException(le);
throw new LDAPException(ResultCode.INVALID_DN_SYNTAX,
ERR_DN_FILE_READER_CANNOT_PARSE_DN.get(dnString, lineNumber,
dnFile.getAbsolutePath(), le.getMessage()),
le);
}
}
}
/**
* Closes this DN file reader.
*
* @throws IOException If a problem is encountered while closing the reader.
*/
@Override()
public void close()
throws IOException
{
reader.close();
}
}