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/*
 * 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
 *
 *     http://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 org.apache.tomee.catalina;

import org.apache.catalina.Realm;
import org.apache.catalina.Wrapper;
import org.apache.catalina.connector.Request;
import org.apache.catalina.realm.CombinedRealm;
import org.apache.catalina.realm.GenericPrincipal;
import org.apache.openejb.loader.SystemInstance;
import org.apache.openejb.spi.SecurityService;
import org.ietf.jgss.GSSContext;

import java.security.Principal;
import java.security.cert.X509Certificate;

public class TomEERealm extends CombinedRealm {
    private static final String INFO = TomEERealm.class.getName() + "/1.0";

    private final ThreadLocal requests = new ThreadLocal();

    @Override
    public String getInfo() {
        return INFO;
    }

    @Override
    public Principal authenticate(final String username, final String password) {
        return logInTomEE(super.authenticate(username, password));
    }

    @Override
    public Principal authenticate(final X509Certificate[] certs) {
        return logInTomEE(super.authenticate(certs));
    }

    @Override
    public Principal authenticate(final String username, final String clientDigest,
                                  final String nonce, final String nc, final String cnonce, final String qop,
                                  final String realmName, final String md5a2) {
        return logInTomEE(super.authenticate(username, clientDigest, nonce, nc, cnonce, qop, realmName, md5a2));
    }

    @Override
    public Principal authenticate(final GSSContext gssContext, final boolean storeCreds) {
        return logInTomEE(super.authenticate(gssContext, storeCreds));
    }

    @Override
    public boolean hasRole(final Wrapper wrapper, final Principal principal, final String rawRole) {
        String role = rawRole;

        // Check for a role alias defined in a  element
        if (wrapper != null) {
            final String realRole = wrapper.findSecurityReference(role);
            if (realRole != null) {
                role = realRole;
            }
        }

        if (principal == null || role == null) {
            return false;
        }

        if (principal instanceof  GenericPrincipal) {
            return ((GenericPrincipal) principal).hasRole(role);
        }

        for (final Realm realm : realms) { // when used implicitely (always?) realms.size == 1 so no need of a strategy
            if (realm.hasRole(wrapper, principal, rawRole)) {
                return true;
            }
        }
        return false;
    }

    private Principal logInTomEE(final Principal pcp) {
        if (pcp == null) {
            return null;
        }

        final TomcatSecurityService ss = (TomcatSecurityService) SystemInstance.get().getComponent(SecurityService.class);
        if (ss != null) {
            // normally we don't care about oldstate because the listener already contains one
            // which is the previous one
            // so no need to clean twice here
            if (requests.get() != null) {
                ss.enterWebApp(this, pcp, requests.get().getWrapper().getRunAs());
            }
        }
        return pcp;
    }

    public void enter(final Request request) {
        requests.set(request);
    }

    public void exit() {
        requests.remove();
    }
}