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PAM/local system authentication
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/*
 * Copyright (c) 2017 Bixbit - Krzysztof Benedyczak All rights reserved.
 * See LICENCE.txt file for licensing information.
 */
package pl.edu.icm.unity.pam;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import org.jvnet.libpam.UnixUser;

import com.google.common.collect.Lists;

import pl.edu.icm.unity.engine.api.authn.remote.RemoteAttribute;
import pl.edu.icm.unity.engine.api.authn.remote.RemoteGroupMembership;
import pl.edu.icm.unity.engine.api.authn.remote.RemoteIdentity;
import pl.edu.icm.unity.engine.api.authn.remote.RemotelyAuthenticatedInput;
import pl.edu.icm.unity.stdext.identity.UsernameIdentity;

/**
 * Shared helpers - allows for converting PAM library's objects to version meaningful for Unity platform. 
 * @author K. Benedyczak
 */
public class LibPAMUtils
{
	public static RemotelyAuthenticatedInput unixUser2RAI(UnixUser unixUser, String idp)
	{
		RemotelyAuthenticatedInput ret = new RemotelyAuthenticatedInput(idp);
		List attributes = new ArrayList<>();
		attributes.add(new RemoteAttribute("gid", unixUser.getGID()));
		attributes.add(new RemoteAttribute("uid", unixUser.getUID()));
		if (unixUser.getDir() != null)
			attributes.add(new RemoteAttribute("home", unixUser.getDir()));
		if (unixUser.getGecos() != null)
			attributes.addAll(processGecos(unixUser.getGecos()));
		if (unixUser.getShell() != null)
			attributes.add(new RemoteAttribute("shell", unixUser.getShell()));
		ret.setAttributes(attributes);
		ret.setRawAttributes(ret.getAttributes());
		ret.setGroups(unixUser.getGroups().stream()
				.map(RemoteGroupMembership::new)
				.collect(Collectors.toList()));
		ret.setIdentities(Lists.newArrayList(new RemoteIdentity(unixUser.getUserName(),
				UsernameIdentity.ID)));
		return ret;
	}
	
	static List processGecos(String gecos)
	{
		List attributes = new ArrayList<>();
		String[] elements = gecos.split(",");
		if (elements.length > 0 && !elements[0].isEmpty())
			attributes.add(new RemoteAttribute("name", elements[0]));
		if (elements.length > 1 && !elements[1].isEmpty())
			attributes.add(new RemoteAttribute("contact", elements[1]));
		if (elements.length > 2 && !elements[2].isEmpty())
			attributes.add(new RemoteAttribute("home-phone", elements[2]));
		if (elements.length > 3 && !elements[3].isEmpty())
			attributes.add(new RemoteAttribute("work-phone", elements[3]));
		if (elements.length > 4 && !elements[4].isEmpty())
			attributes.add(new RemoteAttribute("other", elements[4]));
		return attributes;
	}
}