ConsoleAuthenticator.java

/*
 * Copyright (C) 2009, Google Inc.
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.eclipse.jgit.console;

import java.io.Console;
import java.net.Authenticator;
import java.net.PasswordAuthentication;
import java.text.MessageFormat;

import org.eclipse.jgit.pgm.internal.CLIText;
import org.eclipse.jgit.util.CachedAuthenticator;

/**
 * Basic network prompt for username/password when using the console.
 *
 * @since 4.0
 */
public class ConsoleAuthenticator extends CachedAuthenticator {
    /**
     * Install this authenticator implementation into the JVM.
     */
    public static void install() {
        final ConsoleAuthenticator c = new ConsoleAuthenticator();
        if (c.cons == null)
            throw new NoClassDefFoundError(
                    CLIText.get().noSystemConsoleAvailable);
        Authenticator.setDefault(c);
    }

    private final Console cons = System.console();

    /** {@inheritDoc} */
    @Override
    protected PasswordAuthentication promptPasswordAuthentication() {
        final String realm = formatRealm();
        String username = cons.readLine(MessageFormat.format(
                CLIText.get().usernameFor + " ", realm)); //$NON-NLS-1$
        if (username == null || username.isEmpty()) {
            return null;
        }
        char[] password = cons.readPassword(CLIText.get().password + " "); //$NON-NLS-1$
        if (password == null) {
            password = new char[0];
        }
        return new PasswordAuthentication(username, password);
    }

    private String formatRealm() {
        final StringBuilder realm = new StringBuilder();
        if (getRequestorType() == RequestorType.PROXY) {
            realm.append(getRequestorType());
            realm.append(" "); //$NON-NLS-1$
            realm.append(getRequestingHost());
            if (getRequestingPort() > 0) {
                realm.append(":"); //$NON-NLS-1$
                realm.append(getRequestingPort());
            }
        } else {
            realm.append(getRequestingURL());
        }
        return realm.toString();
    }
}