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OAuth 2.0 SDK with OpenID Connection extensions for developing client
and server applications.
package com.nimbusds.oauth2.sdk.auth;
import java.nio.charset.Charset;
import java.security.SecureRandom;
import java.util.Date;
import net.jcip.annotations.Immutable;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
/**
* Secret or password. The secret should be {@link #erase erased} when no
* longer in use.
*/
@Immutable
public final class Secret {
/**
* The default byte length of generated secrets.
*/
public static final int DEFAULT_BYTE_LENGTH = 32;
/**
* The secure random generator.
*/
private static final SecureRandom secureRandom = new SecureRandom();
/**
* The secret value.
*/
private byte[] value;
/**
* Optional expiration date.
*/
private final Date expDate;
/**
* Creates a new secret with the specified value.
*
* @param value The secret value. Must not be {@code null} or empty
* string.
*/
public Secret(final String value) {
this(value, null);
}
/**
* Creates a new secret with the specified value and expiration date.
*
* @param value The secret value. Must be UTF-8 encoded, not
* {@code null} or empty string.
* @param expDate The expiration date, {@code null} if not specified.
*/
public Secret(final String value, final Date expDate) {
if (StringUtils.isBlank(value))
throw new IllegalArgumentException("The value must not be null or empty string");
this.value = value.getBytes(Charset.forName("utf-8"));
this.expDate = expDate;
}
/**
* Creates a new secret with a randomly generated value of the
* specified byte length, Base64URL-encoded.
*
* @param byteLength The byte length of the secret value to generate.
* Must be greater than one.
*/
public Secret(final int byteLength) {
this(byteLength, null);
}
/**
* Creates a new secret with a randomly generated value of the
* specified byte length, Base64URL-encoded, and the specified
* expiration date.
*
* @param byteLength The byte length of the secret value to generate.
* Must be greater than one.
* @param expDate The expiration date, {@code null} if not
* specified.
*/
public Secret(final int byteLength, final Date expDate) {
if (byteLength < 1)
throw new IllegalArgumentException("The byte length must be a positive integer");
byte[] n = new byte[byteLength];
secureRandom.nextBytes(n);
value = Base64.encodeBase64URLSafe(n);
this.expDate = expDate;
}
/**
* Creates a new secret with a randomly generated 256-bit (32-byte)
* value, Base64URL-encoded.
*/
public Secret() {
this(DEFAULT_BYTE_LENGTH);
}
/**
* Gets the value of this secret.
*
* @return The value as a UTF-8 encoded string, {@code null} if it has
* been erased.
*/
public String getValue() {
if (ArrayUtils.isEmpty(value))
return null;
return new String(value, Charset.forName("utf-8"));
}
/**
* Gets the value of this secret.
*
* @return The value as a byte array, {@code null} if it has
* been erased.
*/
public byte[] getValueBytes() {
return value;
}
/**
* Erases of the value of this secret.
*/
public void erase() {
if (ArrayUtils.isEmpty(value))
return;
for (int i=0; i < value.length; i++)
value[i] = 0;
value = null;
}
/**
* Gets the expiration date of this secret.
*
* @return The expiration date, {@code null} if not specified.
*/
public Date getExpirationDate() {
return expDate;
}
/**
* Checks is this secret has expired.
*
* @return {@code true} if the secret has an associated expiration date
* which is in the past (according to the current system time),
* else returns {@code false}.
*/
public boolean expired() {
if (expDate == null)
return false;
final Date now = new Date();
return expDate.before(now);
}
/**
* Overrides {@code Object.equals()}.
*
* @param object The object to compare to.
*
* @return {@code true} if the objects are secrets the same value,
* otherwise {@code false}.
*/
@Override
public boolean equals(final Object object) {
return object instanceof Secret &&
this.getValue().equals(((Secret)object).getValue());
}
}