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Tomcat 8 integration for WAFFLE
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/**
 * Waffle (https://github.com/Waffle/waffle)
 *
 * Copyright (c) 2010-2018 Application Security, Inc.
 *
 * All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse
 * Public License v1.0 which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html.
 *
 * Contributors: Application Security, Inc.
 */
package waffle.apache;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.catalina.realm.GenericPrincipal;

import waffle.windows.auth.IWindowsAccount;
import waffle.windows.auth.IWindowsIdentity;
import waffle.windows.auth.PrincipalFormat;
import waffle.windows.auth.WindowsAccount;

/**
 * A Windows Principal.
 *
 * @author dblock[at]dblock[dot]org
 */
public class GenericWindowsPrincipal extends GenericPrincipal {

    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;

    /** The sid. */
    private final byte[] sid;

    /** The sid string. */
    private final String sidString;

    /** The groups. */
    private final Map groups;

    /**
     * A windows principal.
     *
     * @param windowsIdentity
     *            Windows identity.
     * @param principalFormat
     *            Principal format.
     * @param roleFormat
     *            Role format.
     */
    public GenericWindowsPrincipal(final IWindowsIdentity windowsIdentity, final PrincipalFormat principalFormat,
            final PrincipalFormat roleFormat) {
        super(windowsIdentity.getFqn(), "",
                GenericWindowsPrincipal.getRoles(windowsIdentity, principalFormat, roleFormat));
        this.sid = windowsIdentity.getSid();
        this.sidString = windowsIdentity.getSidString();
        this.groups = GenericWindowsPrincipal.getGroups(windowsIdentity.getGroups());
    }

    /**
     * Gets the roles.
     *
     * @param windowsIdentity
     *            the windows identity
     * @param principalFormat
     *            the principal format
     * @param roleFormat
     *            the role format
     * @return the roles
     */
    private static List getRoles(final IWindowsIdentity windowsIdentity, final PrincipalFormat principalFormat,
            final PrincipalFormat roleFormat) {
        final List roles = new ArrayList<>();
        roles.addAll(GenericWindowsPrincipal.getPrincipalNames(windowsIdentity, principalFormat));
        for (final IWindowsAccount group : windowsIdentity.getGroups()) {
            roles.addAll(GenericWindowsPrincipal.getRoleNames(group, roleFormat));
        }
        return roles;
    }

    /**
     * Gets the groups.
     *
     * @param groups
     *            the groups
     * @return the groups
     */
    private static Map getGroups(final IWindowsAccount[] groups) {
        final Map groupMap = new HashMap<>();
        for (final IWindowsAccount group : groups) {
            groupMap.put(group.getFqn(), new WindowsAccount(group));
        }
        return groupMap;
    }

    /**
     * Byte representation of the SID.
     *
     * @return Array of bytes.
     */
    public byte[] getSid() {
        return this.sid.clone();
    }

    /**
     * String representation of the SID.
     *
     * @return String.
     */
    public String getSidString() {
        return this.sidString;
    }

    /**
     * Windows groups that the user is a member of.
     *
     * @return A map of group names to groups.
     */
    public Map getGroups() {
        return this.groups;
    }

    /**
     * Returns a list of role principal objects.
     *
     * @param group
     *            Windows group.
     * @param principalFormat
     *            Principal format.
     * @return List of role principal objects.
     */
    private static List getRoleNames(final IWindowsAccount group, final PrincipalFormat principalFormat) {
        final List principals = new ArrayList<>();
        switch (principalFormat) {
            case FQN:
                principals.add(group.getFqn());
                break;
            case SID:
                principals.add(group.getSidString());
                break;
            case BOTH:
                principals.add(group.getFqn());
                principals.add(group.getSidString());
                break;
            case NONE:
            default:
                break;
        }
        return principals;
    }

    /**
     * Returns a list of user principal objects.
     *
     * @param windowsIdentity
     *            Windows identity.
     * @param principalFormat
     *            Principal format.
     * @return A list of user principal objects.
     */
    private static List getPrincipalNames(final IWindowsIdentity windowsIdentity,
            final PrincipalFormat principalFormat) {
        final List principals = new ArrayList<>();
        switch (principalFormat) {
            case FQN:
                principals.add(windowsIdentity.getFqn());
                break;
            case SID:
                principals.add(windowsIdentity.getSidString());
                break;
            case BOTH:
                principals.add(windowsIdentity.getFqn());
                principals.add(windowsIdentity.getSidString());
                break;
            case NONE:
            default:
                break;
        }
        return principals;
    }

    /**
     * Get an array of roles as a string.
     *
     * @return Role1, Role2, ...
     */
    public String getRolesString() {
        return String.join(", ", this.getRoles());
    }
}