javax.security.auth.callback.PasswordCallback Maven / Gradle / Ivy
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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* 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 javax.security.auth.callback;
import java.io.Serializable;
import java.util.Arrays;
/**
* Used in conjunction with a {@link CallbackHandler} to retrieve a password
* when needed.
*/
public class PasswordCallback implements Callback, Serializable {
private static final long serialVersionUID = 2267422647454909926L;
private String prompt;
boolean echoOn;
private char[] inputPassword;
private void setPrompt(String prompt) throws IllegalArgumentException {
if (prompt == null || prompt.length() == 0) {
throw new IllegalArgumentException("Invalid prompt");
}
this.prompt = prompt;
}
/**
* Creates a new {@code PasswordCallback} instance.
*
* @param prompt
* the message that should be displayed to the user
* @param echoOn
* determines whether the user input should be echoed
*/
public PasswordCallback(String prompt, boolean echoOn) {
setPrompt(prompt);
this.echoOn = echoOn;
}
/**
* Returns the prompt that was specified when creating this {@code
* PasswordCallback}
*
* @return the prompt
*/
public String getPrompt() {
return prompt;
}
/**
* Queries whether this {@code PasswordCallback} expects user input to be
* echoed, which is specified during the creation of the object.
*
* @return {@code true} if (and only if) user input should be echoed
*/
public boolean isEchoOn() {
return echoOn;
}
/**
* Sets the password. The {@link CallbackHandler} that performs the actual
* provisioning or input of the password needs to call this method to hand
* back the password to the security service that requested it.
*
* @param password
* the password. A copy of this is stored, so subsequent changes
* to the input array do not affect the {@code PasswordCallback}.
*/
public void setPassword(char[] password) {
if (password == null) {
this.inputPassword = password;
} else {
inputPassword = new char[password.length];
System.arraycopy(password, 0, inputPassword, 0, inputPassword.length);
}
}
/**
* Returns the password. The security service that needs the password
* usually calls this method once the {@link CallbackHandler} has finished
* its work.
*
* @return the password. A copy of the internal password is created and
* returned, so subsequent changes to the internal password do not
* affect the result.
*/
public char[] getPassword() {
if (inputPassword != null) {
char[] tmp = new char[inputPassword.length];
System.arraycopy(inputPassword, 0, tmp, 0, tmp.length);
return tmp;
}
return null;
}
/**
* Clears the password stored in this {@code PasswordCallback}.
*/
public void clearPassword() {
if (inputPassword != null) {
Arrays.fill(inputPassword, '\u0000');
}
}
}