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/*******************************************************************************
 *     Cloud Foundry
 *     Copyright (c) [2009-2016] Pivotal Software, Inc. All Rights Reserved.
 *
 *     This product is licensed to you under the Apache License, Version 2.0 (the "License").
 *     You may not use this product except in compliance with the License.
 *
 *     This product includes a number of subcomponents with
 *     separate copyright notices and license terms. Your use of these
 *     subcomponents is subject to the terms and conditions of the
 *     subcomponent's license, as noted in the LICENSE file.
 *******************************************************************************/
package org.cloudfoundry.identity.uaa.user;

import com.fasterxml.jackson.annotation.JsonCreator;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * The UAA only distinguishes 2 types of user for internal usage, denoted
 * uaa.admin and uaa.user. Other authorities might be
 * stored in the back end for the purposes of other resource servers,
 * so this enumeration has convenient methods for extracting the UAA user types
 * from authorities lists.
 *
 * @author Luke Taylor
 * @author Dave Syer
 */
public enum UaaAuthority implements GrantedAuthority {

    UAA_INVITED("uaa.invited", 1), UAA_ADMIN("uaa.admin", 1), UAA_USER("uaa.user", 0), UAA_NONE("uaa.none", -1);

    public static final List ADMIN_AUTHORITIES = Collections.unmodifiableList(Arrays.asList(UAA_ADMIN,
                    UAA_USER));

    public static final List USER_AUTHORITIES = Collections.unmodifiableList(Arrays.asList(UAA_USER));

    public static final List NONE_AUTHORITIES = Collections.unmodifiableList(Arrays.asList(UAA_NONE));

    private final int value;

    private final String userType;

    private UaaAuthority(String userType, int value) {
        this.userType = userType;
        this.value = value;
    }

    public int value() {
        return value;
    }

    /**
     * The name of the type of user, either "uaa.admin" or "uaa.user".
     *
     * @return a user type name
     */
    public String getUserType() {
        return userType;
    }

    /**
     * The authority granted by this value (same as user type).
     *
     * @return the name of the value (uaa.user, etc.)
     * @see org.springframework.security.core.GrantedAuthority#getAuthority()
     */
    @Override
    public String getAuthority() {
        return userType;
    }

    @Override
    public String toString() {
        return userType;
    }

    @JsonCreator
    public static UaaAuthority fromAuthorities(String authorities) {
        String type = authorities == null ? "uaa.user" : authorities.toLowerCase();
        return type.contains("uaa.admin") ? UAA_ADMIN : UAA_USER;
    }

    public static GrantedAuthority authority(String value) {
        return value.equals("uaa.admin") ? UAA_ADMIN : value.contains("uaa.user") ? UAA_USER
                        : new SimpleGrantedAuthority(value);
    }
}