/*
 *  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.web.authentication.preauth.x509

import java.security.cert.X509Certificate

import groovy.transform.CompileStatic
import groovy.util.logging.Slf4j

import org.springframework.context.MessageSource
import org.springframework.context.MessageSourceAware
import org.springframework.context.support.MessageSourceAccessor
import org.springframework.security.authentication.BadCredentialsException
import org.springframework.security.core.SpringSecurityMessageSource
import org.springframework.security.web.authentication.preauth.x509.X509PrincipalExtractor

/**
 * @author Burt Beckwith
 */
@Slf4j
@CompileStatic
class ClosureX509PrincipalExtractor implements X509PrincipalExtractor, MessageSourceAware {

    protected MessageSourceAccessor messages = SpringSecurityMessageSource.accessor

    /** Dependency injection for the closure to use to extract the username. */
    Closure<?> closure

    def extractPrincipal(X509Certificate clientCert) {
        String subjectDN = clientCert.subjectDN.name

        log.debug "Subject DN is '{}'", subjectDN

        def username = closure.call(subjectDN)
        if (username == null) {
            final String code = 'SubjectDnX509PrincipalExtractor.noMatching'
            final String defaultMessage = 'No matching pattern was found in subject DN: {}'
            Object[] args = [subjectDN] as Object[]
            throw new BadCredentialsException(messages.getMessage(code, args, defaultMessage))
        }

        log.debug "Extracted Principal name is '{}'", username

        username
    }

    /**
     * Dependency injection for the message source.
     * @param messageSource the message source
     */
    @Override
    void setMessageSource(MessageSource messageSource) {
        messages = new MessageSourceAccessor(messageSource)
    }
}
