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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 2021 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright 2021 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) 2021 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.ldap.sdk;
import java.io.Serializable;
import com.unboundid.util.ByteString;
import com.unboundid.util.ByteStringBuffer;
import com.unboundid.util.NotMutable;
import com.unboundid.util.NotNull;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
/**
* This class defines a set of properties that can be used to indicate which
* types of optional escaping should be performed by the LDAP SDK when
* constructing the string representation of DNs and RDNs.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class DNEscapingStrategy
implements Serializable
{
/**
* A DN escaping strategy that represents a default, user-friendly
* configuration. This includes:
*
* -
* ASCII control characters will be escaped.
*
* -
* Displayable non-ASCII characters will not be escaped.
*
* -
* Non-displayable non-ASCII characters will be escaped.
*
* -
* In non-UTF-8 data, all bytes with the most significant bit set will be
* escaped.
*
*
*/
@NotNull public static final DNEscapingStrategy DEFAULT =
new DNEscapingStrategy(true, false, true, true);
/**
* A DN escaping strategy that indicates that the LDAP SDK should only perform
* required escaping and should not perform any optional escaping.
*/
@NotNull public static final DNEscapingStrategy MINIMAL =
new DNEscapingStrategy(false, false, false, false);
/**
* A base64-encoding strategy that indicates that the LDAP SDK should
* perform the maximum amount of DN escaping that is considered reasonable.
* All ASCII control characters, all non-ASCII characters and non-UTF-8 bytes
* will be escaped.
*/
@NotNull public static final DNEscapingStrategy MAXIMAL =
new DNEscapingStrategy(true, true, true, true);
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -5438646712027992419L;
// Indicates whether ASCII control characters should be escaped.
private final boolean escapeASCIIControlCharacters;
// Indicates whether displayable non-ASCII characters should be escaped.
private final boolean escapeDisplayableNonASCIICharacters;
// Indicates whether non-displayable non-ASCII characters should be escaped.
private final boolean escapeNonDisplayableNonASCIICharacters;
// Indicates whether bytes with the most significant bit set in non-UTF-8 data
// should be escaped.
private final boolean escapeNonUTF8Data;
/**
* Creates a new DN escaping strategy with the specified settings.
*
* @param escapeASCIIControlCharacters
* Indicates whether ASCII control characters (characters whose
* Unicode code point is less than or equal to 0x1F, or is equal
* to 0x7F) should be escaped. Note that the ASCII NULL control
* character (0x00) will always be escaped.
* @param escapeDisplayableNonASCIICharacters
* Indicates whether non-ASCII characters (characters whose
* Unicode code point is greater than 0x7F) that are believed to
* be displayable (as determined by the
* {@link StaticUtils#isLikelyDisplayableCharacter} method)
* should be escaped.
* @param escapeNonDisplayableNonASCIICharacters
* Indicates whether non-ASCII characters (characters whose
* Unicode code point is greater than 0x7F) that are not believed
* to be displayable (as determined by the
* {@link StaticUtils#isLikelyDisplayableCharacter} method)
* should be escaped.
* @param escapeNonUTF8Data
* Indicates whether bytes with the most significant bit set in
* non-UTF-8 data should be escaped. Note that if a value does
* not represent a valid UTF-8 string, then the
* {@code escapeDisplayableNonASCIICharacters} and
* {@code escapeNonDisplayableNonASCIICharacters} arguments will
* not be used.
*/
public DNEscapingStrategy(final boolean escapeASCIIControlCharacters,
final boolean escapeDisplayableNonASCIICharacters,
final boolean escapeNonDisplayableNonASCIICharacters,
final boolean escapeNonUTF8Data)
{
this.escapeASCIIControlCharacters = escapeASCIIControlCharacters;
this.escapeDisplayableNonASCIICharacters =
escapeDisplayableNonASCIICharacters;
this.escapeNonDisplayableNonASCIICharacters =
escapeNonDisplayableNonASCIICharacters;
this.escapeNonUTF8Data = escapeNonUTF8Data;
}
/**
* Indicates whether ASCII control characters should be escaped. Note that
* the ASCII NULL control character (0x00) will always be escaped.
*
* @return {@code true} if ASCII control characters should be escaped, or
* {@code false} if not.
*/
public boolean escapeASCIIControlCharacters()
{
return escapeASCIIControlCharacters;
}
/**
* Indicates whether displayable non-ASCII characters (as determined by the
* {@link StaticUtils#isLikelyDisplayableCharacter} method) should be escaped.
* Note that this only applies to values that represent valid UTF-8 strings.
* Values that are not valid UTF-8 strings will use the setting represented
* by the {@link #escapeNonUTF8Data} method.
*
* @return {@code true} if displayable non-ASCII characters should be
* escaped, or {@code false} if not.
*/
public boolean escapeDisplayableNonASCIICharacters()
{
return escapeDisplayableNonASCIICharacters;
}
/**
* Indicates whether non-displayable non-ASCII characters (as determined by
* the {@link StaticUtils#isLikelyDisplayableCharacter} method) should be
* escaped. Note that this only applies to values that represent valid UTF-8
* strings. Values that are not valid UTF-8 strings will use the setting
* represented by the {@link #escapeNonUTF8Data} method.
*
* @return {@code true} if non-displayable non-ASCII characters should be
* escaped, or {@code false} if not.
*/
public boolean escapeNonDisplayableNonASCIICharacters()
{
return escapeNonDisplayableNonASCIICharacters;
}
/**
* Indicates whether bytes with the most significant bit set in non-UTF-8 data
* (as determined by the {@link StaticUtils#isValidUTF8} method) should be
* escaped.
*
* @return {@code true} if bytes with the most significant bit set in
* non-UTF-8 data should be escaped, or {@code false} if not.
*/
public boolean escapeNonUTF8Data()
{
return escapeNonUTF8Data;
}
/**
* Appends an appropriately escaped representation of the provided value to
* the given buffer.
*
* @param value The value to be appended. It must not be {@code null}.
* @param buffer The buffer to which the escaped value should be appended.
* It must not be {@code null}.
*/
public void escape(@NotNull final byte[] value,
@NotNull final ByteStringBuffer buffer)
{
// If the value is empty, then we don't need to do anything.
final int valueLength = value.length;
if ((value == null) || (valueLength == 0))
{
return;
}
// Iterate through the value and examine each byte.
Boolean isNonUTF8 = null;
for (int i=0; i < valueLength; i++)
{
final byte b = value[i];
switch (b)
{
// The following characters will always be escaped anywhere in a value.
case '"':
case '+':
case ',':
case ';':
case '<':
case '>':
case '\\':
buffer.append('\\');
buffer.append(b);
break;
// The ASCII NULL character must also always be escaped, but it should
// use a hex encoding.
case '\u0000':
buffer.append("\\00");
break;
// Spaces will only be escaped if they are the first or last character
// of the value.
case ' ':
if ((i == 0) || (i == (valueLength - 1)))
{
buffer.append('\\');
}
buffer.append(b);
break;
// The octothorpe character will only be escaped if it is the first
// character of a value.
case '#':
if (i == 0)
{
buffer.append('\\');
}
buffer.append(b);
break;
default:
// If the byte is between 0x00 and 0x1F (inclusive), or if it's 0x7F,
// then it's an ASCII control character. Handle that appropriately.
if (((b >= 0x00) && (b <= 0x1F)) || (b == 0x07F))
{
if (escapeASCIIControlCharacters)
{
buffer.append('\\');
buffer.append(StaticUtils.toHex(b));
}
else
{
buffer.append(b);
}
}
// Because Java represents bytes as signed values, if a byte is
// greater than zero, then it's an ASCII byte and we won't escape it.
else if (b > 0x00)
{
buffer.append(b);
}
// If we've gotten here, then the byte is negative, which means that
// it's not ASCII. If we know that it's non-UTF-8 data, then handle
// that in accordance with the escapeNonUTF8Data flag. Otherwise,
// check to see whether it is valid UTF-8 and handle it as either a
// string comprised of code points or as non-UTF-8 data.
else
{
if (isNonUTF8 == null)
{
final byte[] remainingValueBytes = new byte[valueLength - i];
System.arraycopy(value, i, remainingValueBytes, 0,
remainingValueBytes.length);
if (StaticUtils.isValidUTF8(remainingValueBytes))
{
escape(StaticUtils.toUTF8String(remainingValueBytes), buffer,
(i == 0));
return;
}
else
{
isNonUTF8 = Boolean.TRUE;
}
}
// If we've gotten here, then we know that it's non-UTF-8 data
// (because we would have gone to a different method if it was
// valid UTF-8), so handle that in accordance with the
// escapeNonUTF8Data flag.
if (escapeNonUTF8Data)
{
buffer.append('\\');
buffer.append(StaticUtils.toHex(b));
}
else
{
buffer.append(b);
}
}
break;
}
}
}
/**
* Appends an appropriately escaped representation of the provided value to
* the given buffer.
*
* @param value The value to be appended. It must not be {@code null}.
* @param buffer The buffer to which the escaped value should be appended.
* It must not be {@code null}.
*/
public void escape(@NotNull final String value,
@NotNull final ByteStringBuffer buffer)
{
escape(value, buffer, true);
}
/**
* Appends an appropriately escaped representation of the provided value to
* the given buffer.
*
* @param value The value to be appended. It must not be {@code null}.
* @param buffer The buffer to which the escaped value should be appended.
* It must not be {@code null}.
*/
public void escape(@NotNull final ByteString value,
@NotNull final ByteStringBuffer buffer)
{
escape(value.getValue(), buffer);
}
/**
* Appends an appropriately escaped representation of the provided value to
* the given buffer.
*
* @param value The value to be appended. It must not be
* {@code null}.
* @param buffer The buffer to which the escaped value should be
* appended. It must not be {@code null}.
* @param isWholeString Indicates whether the provided string represents the
* entire value being processed, or if a portion of the
* value may have already been processed.
*/
private void escape(@NotNull final String value,
@NotNull final ByteStringBuffer buffer,
final boolean isWholeString)
{
if ((value == null) || value.isEmpty())
{
return;
}
int pos = 0;
while (pos < value.length())
{
final int codePoint = value.codePointAt(pos);
switch (codePoint)
{
// The following characters will always be escaped anywhere in a value.
case '"':
case '+':
case ',':
case ';':
case '<':
case '>':
case '\\':
buffer.append('\\');
buffer.append((byte) codePoint);
break;
// The ASCII NULL character must also always be escaped, but it should
// use a hex encoding.
case '\u0000':
buffer.append("\\00");
break;
// Spaces will only be escaped if they are the first or last character
// of the value.
case ' ':
if (((pos == 0) && isWholeString) ||
(pos == (value.length() - 1)))
{
buffer.append('\\');
}
buffer.append(' ');
break;
// The octothorpe character will only be escaped if it is the first
// character of a value.
case '#':
if ((pos == 0) && isWholeString)
{
buffer.append('\\');
}
buffer.append('#');
break;
default:
// If the code point is between 0x00 and 0x1F (inclusive), or if it is
// 0x7F, then it's an ASCII control character. Handle that
// appropriately.
if (((codePoint >= 0x00) && (codePoint <= 0x1F)) ||
(codePoint == 0x7F))
{
final byte codePointByte = (byte) codePoint;
if (escapeASCIIControlCharacters)
{
buffer.append('\\');
buffer.append(StaticUtils.toHex(codePointByte));
}
else
{
buffer.append(codePointByte);
}
}
// If the code point is less than 0x7F, then it's an ASCII character
// that we don't need to escape.
else if (codePoint < 0x7F)
{
buffer.append((byte) codePoint);
}
// If we've gotten here, then the code point must represent a
// non-ASCII character. Determine whether it's displayable and handle
// it appropriately.
else
{
final String codePointString =
new String(new int[] { codePoint }, 0, 1);
final byte[] codePointBytes = StaticUtils.getBytes(codePointString);
if (StaticUtils.isLikelyDisplayableCharacter(codePoint))
{
if (escapeDisplayableNonASCIICharacters)
{
for (final byte b : codePointBytes)
{
buffer.append('\\');
buffer.append(StaticUtils.toHex(b));
}
}
else
{
buffer.append(codePointBytes);
}
}
else
{
if (escapeNonDisplayableNonASCIICharacters)
{
for (final byte b : codePointBytes)
{
buffer.append('\\');
buffer.append(StaticUtils.toHex(b));
}
}
else
{
buffer.append(codePointBytes);
}
}
}
break;
}
final int charsPerCodePoint = Character.charCount(codePoint);
pos += charsPerCodePoint;
}
}
/**
* Retrieves a string representation of this base64 encoding strategy.
*
* @return A string representation of this base64 encoding strategy.
*/
@Override()
@NotNull()
public String toString()
{
final StringBuilder buffer = new StringBuilder();
toString(buffer);
return buffer.toString();
}
/**
* Appends a string representation of this base64 encoding strategy to the
* provided buffer.
*
* @param buffer The buffer to which the string representation should be
* appended.
*/
public void toString(@NotNull final StringBuilder buffer)
{
buffer.append("DNEscapingStrategy(escapeASCIIControlCharacters=");
buffer.append(escapeASCIIControlCharacters);
buffer.append(", escapeDisplayableNonASCIICharacters=");
buffer.append(escapeDisplayableNonASCIICharacters);
buffer.append(", escapeNonDisplayableNonASCIICharacters=");
buffer.append(escapeNonDisplayableNonASCIICharacters);
buffer.append(", escapeNonUTF8Data=");
buffer.append(escapeNonUTF8Data);
buffer.append(')');
}
}