/*
    * 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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   * without modification, are permitted provided that the following
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   *   notice, this list of conditions and the following disclaimer.
   *
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   *   disclaimer in the documentation and/or other materials provided
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   * - Neither the name of the Eclipse Foundation, Inc. nor the
   *   names of its contributors may be used to endorse or promote
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  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 UserInfo} adapter for a {@link 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;
  	}
  
  	@Override
  	public String getPassword() {
  		return password;
  	}
  
  	@Override
  	public String getPassphrase() {
  		return passphrase;
  	}
  
  	@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;
 		}
 	}
 
 	@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);
 	}
 
 	@Override
 	public boolean promptYesNo(String msg) {
 		CredentialItem.YesNoType v = new CredentialItem.YesNoType(msg);
 		return provider.get(uri, v) && v.getValue();
 	}
 
 	@Override
 	public void showMessage(String msg) {
 		provider.get(uri, new CredentialItem.InformationalMessage(msg));
 	}
 
 	@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;
 	}
 }