/*
    * Copyright (C) 2010, Google Inc. 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.internal.transport.ssh.jsch;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  import org.eclipse.jgit.transport.CredentialItem;
  import org.eclipse.jgit.transport.CredentialsProvider;
  import org.eclipse.jgit.transport.URIish;
  
  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;
  		}
  		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;
  		}
  		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;
 	}
 }