/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package grails.plugin.springsecurity.ldap.userdetails

import groovy.transform.CompileStatic

import org.springframework.beans.factory.InitializingBean
import org.springframework.ldap.core.DirContextOperations
import org.springframework.security.core.GrantedAuthority
import org.springframework.security.core.authority.SimpleGrantedAuthority
import org.springframework.security.core.userdetails.UserDetails
import org.springframework.security.core.userdetails.UsernameNotFoundException
import org.springframework.security.ldap.userdetails.LdapAuthoritiesPopulator
import org.springframework.util.Assert

import grails.plugin.springsecurity.userdetails.GrailsUserDetailsService

/**
 * @author <a href='mailto:burt@burtbeckwith.com'>Burt Beckwith</a>
 */
@CompileStatic
class DatabaseOnlyLdapAuthoritiesPopulator implements LdapAuthoritiesPopulator, InitializingBean {

    protected GrantedAuthority defaultRole

    /** Dependency injection for the user details service. */
    GrailsUserDetailsService userDetailsService

    Collection<GrantedAuthority> getGrantedAuthorities(DirContextOperations userData, String username) {

        def roles = [] as Set<GrantedAuthority>
        if (defaultRole) {
            roles << defaultRole
        }

        UserDetails dbDetails
        try {
            dbDetails = userDetailsService.loadUserByUsername(username, true)
        }
        catch (UsernameNotFoundException ignored) {
            // just looking for roles, so ignore the UsernameNotFoundException
        }

        if (dbDetails?.authorities != null) {
            roles.addAll(dbDetails.authorities)
        }

        roles
    }

    /**
     * The default role which will be assigned to all users.
     *
     * @param defaultRoleName the role name, including any desired prefix.
     */
    void setDefaultRole(String defaultRoleName) {
        Assert.notNull defaultRoleName, 'The defaultRole property cannot be set to null'
        defaultRole = new SimpleGrantedAuthority(defaultRoleName)
    }

    void afterPropertiesSet() {
        Assert.notNull userDetailsService, 'userDetailsService must be specified'
    }
}
