/*
* Copyright (C) 2010, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
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* - Redistributions of source code must retain the above copyright
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package org.eclipse.jgit.transport;
import java.util.Arrays;
import org.eclipse.jgit.internal.JGitText;
/**
* A credential requested from a {@link CredentialsProvider}.
*
* Most users should work with the specialized subclasses:
* <ul>
* <li>{@link Username} for usernames</li>
* <li>{@link Password} for passwords</li>
* <li>{@link StringType} for other general string information</li>
* <li>{@link CharArrayType} for other general secret information</li>
* </ul>
*
* This class is not thread-safe. Applications should construct their own
* instance for each use, as the value is held within the CredentialItem object.
*/
public abstract class CredentialItem {
private final String promptText;
private final boolean valueSecure;
/**
* Initialize a prompt.
*
* @param promptText
* prompt to display to the user alongside of the input field.
* Should be sufficient text to indicate what to supply for this
* item.
* @param maskValue
* true if the value should be masked from displaying during
* input. This should be true for passwords and other secrets,
* false for names and other public data.
*/
public CredentialItem(String promptText, boolean maskValue) {
this.promptText = promptText;
this.valueSecure = maskValue;
}
/** @return prompt to display to the user. */
public String getPromptText() {
return promptText;
}
/** @return true if the value should be masked when entered. */
public boolean isValueSecure() {
return valueSecure;
}
/** Clear the stored value, destroying it as much as possible. */
public abstract void clear();
/**
* An item whose value is stored as a string.
*
* When working with secret data, consider {@link CharArrayType} instead, as
* the internal members of the array can be cleared, reducing the chances
* that the password is left in memory after authentication is completed.
*/
public static class StringType extends CredentialItem {
private String value;
/**
* Initialize a prompt for a single string.
*
* @param promptText
* prompt to display to the user alongside of the input
* field. Should be sufficient text to indicate what to
* supply for this item.
* @param maskValue
* true if the value should be masked from displaying during
* input. This should be true for passwords and other
* secrets, false for names and other public data.
*/
public StringType(String promptText, boolean maskValue) {
super(promptText, maskValue);
}
@Override
public void clear() {
value = null;
}
/** @return the current value */
public String getValue() {
return value;
}
/**
*
* @param newValue
*/
public void setValue(String newValue) {
value = newValue;
}
}
/** An item whose value is stored as a char[] and is therefore clearable. */
public static class CharArrayType extends CredentialItem {
private char[] value;
/**
* Initialize a prompt for a secure value stored in a character array.
*
* @param promptText
* prompt to display to the user alongside of the input
* field. Should be sufficient text to indicate what to
* supply for this item.
* @param maskValue
* true if the value should be masked from displaying during
* input. This should be true for passwords and other
* secrets, false for names and other public data.
*/
public CharArrayType(String promptText, boolean maskValue) {
super(promptText, maskValue);
}
/** Destroys the current value, clearing the internal array. */
@Override
public void clear() {
if (value != null) {
Arrays.fill(value, (char) 0);
value = null;
}
}
/**
* Get the current value.
*
* The returned array will be cleared out when {@link #clear()} is
* called. Callers that need the array elements to survive should delay
* invoking {@code clear()} until the value is no longer necessary.
*
* @return the current value array. The actual internal array is
* returned, reducing the number of copies present in memory.
*/
public char[] getValue() {
return value;
}
/**
* Set the new value, clearing the old value array.
*
* @param newValue
* if not null, the array is copied.
*/
public void setValue(char[] newValue) {
clear();
if (newValue != null) {
value = new char[newValue.length];
System.arraycopy(newValue, 0, value, 0, newValue.length);
}
}
/**
* Set the new value, clearing the old value array.
*
* @param newValue
* the new internal array. The array is <b>NOT</b> copied.
*/
public void setValueNoCopy(char[] newValue) {
clear();
value = newValue;
}
}
/** An item whose value is a boolean choice, presented as Yes/No. */
public static class YesNoType extends CredentialItem {
private boolean value;
/**
* Initialize a prompt for a single boolean answer.
*
* @param promptText
* prompt to display to the user alongside of the input
* field. Should be sufficient text to indicate what to
* supply for this item.
*/
public YesNoType(String promptText) {
super(promptText, false);
}
@Override
public void clear() {
value = false;
}
/** @return the current value */
public boolean getValue() {
return value;
}
/**
* Set the new value.
*
* @param newValue
*/
public void setValue(boolean newValue) {
value = newValue;
}
}
/** An advice message presented to the user, with no response required. */
public static class InformationalMessage extends CredentialItem {
/**
* Initialize an informational message.
*
* @param messageText
* message to display to the user.
*/
public InformationalMessage(String messageText) {
super(messageText, false);
}
@Override
public void clear() {
// Nothing to clear.
}
}
/** Prompt for a username, which is not masked on input. */
public static class Username extends StringType {
/** Initialize a new username item, with a default username prompt. */
public Username() {
super(JGitText.get().credentialUsername, false);
}
}
/** Prompt for a password, which is masked on input. */
public static class Password extends CharArrayType {
/** Initialize a new password item, with a default password prompt. */
public Password() {
super(JGitText.get().credentialPassword, true);
}
/**
* Initialize a new password item, with given prompt.
*
* @param msg
* prompt message
*/
public Password(String msg) {
super(msg, true);
}
}
}