/*
 * 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
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.transport;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import com.jcraft.jsch.Session;
import com.jcraft.jsch.UIKeyboardInteractive;
import com.jcraft.jsch.UserInfo;

/**
 * A JSch {@link com.jcraft.jsch.UserInfo} adapter for a
 * {@link org.eclipse.jgit.transport.CredentialsProvider}.
 */
public class CredentialsProviderUserInfo implements UserInfo,
		UIKeyboardInteractive {
	private final URIish uri;

	private final CredentialsProvider provider;

	private String password;

	private String passphrase;

	/**
	 * Wrap a CredentialsProvider to make it suitable for use with JSch.
	 *
	 * @param session
	 *            the JSch session this UserInfo will support authentication on.
	 * @param credentialsProvider
	 *            the provider that will perform the authentication.
	 */
	public CredentialsProviderUserInfo(Session session,
			CredentialsProvider credentialsProvider) {
		this.uri = createURI(session);
		this.provider = credentialsProvider;
	}

	private static URIish createURI(Session session) {
		URIish uri = new URIish();
		uri = uri.setScheme("ssh"); //$NON-NLS-1$
		uri = uri.setUser(session.getUserName());
		uri = uri.setHost(session.getHost());
		uri = uri.setPort(session.getPort());
		return uri;
	}

	/** {@inheritDoc} */
	@Override
	public String getPassword() {
		return password;
	}

	/** {@inheritDoc} */
	@Override
	public String getPassphrase() {
		return passphrase;
	}

	/** {@inheritDoc} */
	@Override
	public boolean promptPassphrase(String msg) {
		CredentialItem.StringType v = newPrompt(msg);
		if (provider.get(uri, v)) {
			passphrase = v.getValue();
			return true;
		} else {
			passphrase = null;
			return false;
		}
	}

	/** {@inheritDoc} */
	@Override
	public boolean promptPassword(String msg) {
		CredentialItem.Password p = new CredentialItem.Password(msg);
		if (provider.get(uri, p)) {
			password = new String(p.getValue());
			return true;
		} else {
			password = null;
			return false;
		}
	}

	private CredentialItem.StringType newPrompt(String msg) {
		return new CredentialItem.StringType(msg, true);
	}

	/** {@inheritDoc} */
	@Override
	public boolean promptYesNo(String msg) {
		CredentialItem.YesNoType v = new CredentialItem.YesNoType(msg);
		return provider.get(uri, v) && v.getValue();
	}

	/** {@inheritDoc} */
	@Override
	public void showMessage(String msg) {
		provider.get(uri, new CredentialItem.InformationalMessage(msg));
	}

	/** {@inheritDoc} */
	@Override
	public String[] promptKeyboardInteractive(String destination, String name,
			String instruction, String[] prompt, boolean[] echo) {
		CredentialItem.StringType[] v = new CredentialItem.StringType[prompt.length];
		for (int i = 0; i < prompt.length; i++)
			v[i] = new CredentialItem.StringType(prompt[i], !echo[i]);

		List<CredentialItem> items = new ArrayList<>();
		if (instruction != null && instruction.length() > 0)
			items.add(new CredentialItem.InformationalMessage(instruction));
		items.addAll(Arrays.asList(v));

		if (!provider.get(uri, items))
			return null; // cancel

		String[] result = new String[v.length];
		for (int i = 0; i < v.length; i++)
			result[i] = v[i].getValue();
		return result;
	}
}